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Park MJ, Choi JW, Kim JH, Chung YS, Yu MS. Sinonasal Organizing Hematoma: Demographics, Diagnosis, and Treatment Outcomes of 112 patients. Laryngoscope 2024; 134:1581-1590. [PMID: 37772801 DOI: 10.1002/lary.31057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2023] [Revised: 08/17/2023] [Accepted: 09/06/2023] [Indexed: 09/30/2023]
Abstract
INTRODUCTION Sinonasal organizing hematoma (OH) is a rare, nonneoplastic lesion that often presents with epistaxis, a reddish mass, and destruction of the involved sinonasal structures. Due to its rarity, the demographics, diagnostic modalities, treatment strategies, and outcomes have not yet been studied in a large, long-term study. MATERIALS AND METHODS Retrospect cohort of 112 sinonasal OH patients treated between 1997 and 2020 in a tertiary, university hospital were evaluated. Demographics, systemic comorbidities, sinonasal surgery history, serum laboratory tests, radiological findings, and treatment results were collected. The present study aimed to assess the accuracy of preoperative computed tomography (CT), Gadolinum-enhanced magnetic resonance (MR), and punch biopsies in detecting sinonasal OH as the most likely diagnosis. In addition, incidental differences by age and year of diagnosis were calculated using the Poisson log-linear regression model. RESULTS The median age was 44, and 58% were male. Fewer than 20% of these cases had a chronic systemic comorbidity, bleeding tendency, or sinonasal surgery history. MR had the highest accuracy of (87%) to detect sinonasal OH as the most likely diagnosis, compared with contrast-enhanced-CT (53%), punch biopsy (49%), and non-enhanced-CT (16%) (all <0.05). Sinonasal OH incidence did not vary by age, but the yearly rate significantly increased by 1.05 times over 23 years (p < 0.05). Notably, 84% of 112 patients received surgical removal through the assistance of an endoscope, and none had substantial bleeding without preoperative embolization. CONCLUSION Sinonasal OH was observed regardless of age, sex, systemic comorbidities, bleeding tendency, prior sinonasal surgery, or trauma. Preoperative MR gives the highest accuracy for detecting this disease. Sinonasal OH may be safely managed with endoscopic-assisted surgery removal without embolization. LEVEL OF EVIDENCE 4 Laryngoscope, 134:1581-1590, 2024.
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Affiliation(s)
- Marn Joon Park
- Department of Otorhinolaryngology-Head & Neck Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
- Department of Otorhinolaryngology-Head and Neck Surgery, Inha University Medical Center, Inha University School of Medicine, Incheon, Korea
| | - Ji-Won Choi
- Department of Otorhinolaryngology-Head & Neck Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Ji Heui Kim
- Department of Otorhinolaryngology-Head & Neck Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Yoo-Sam Chung
- Department of Otorhinolaryngology-Head & Neck Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Myeong Sang Yu
- Department of Otorhinolaryngology-Head & Neck Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
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Lee HJ, Choi JW. Association between waist circumference change after smoking cessation and incidence of hypertension in Korean adults. Public Health 2024; 229:73-79. [PMID: 38402666 DOI: 10.1016/j.puhe.2024.01.028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2023] [Revised: 12/14/2023] [Accepted: 01/26/2024] [Indexed: 02/27/2024]
Abstract
OBJECTIVES This study investigates the association between smoking cessation and hypertension incidence, as well as the association between waist circumference change after smoking cessation and hypertension incidence. STUDY DESIGN This was a nationwide population-based cohort study. METHODS We used the Korean Health Screening Cohort data and included 158,505 participants who had undergone two or more health examinations between 2008 and 2011, with follow-ups throughout 2019. Smoking cessation and waist changes were captured based on difference between first and follow-up screening dates. Hazard ratio (HR) and 95% confidence interval (CI) for hypertension risk were estimated using multivariable Cox proportional hazard regression models. RESULTS There were 31,270 cases of hypertension during a median follow-up of 8.50 years. After adjusting for potential confounding factors, HR for hypertension were 1.01 (95% CI: 0.97-1.05), 0.91 (95% CI: 0.87-0.95), and 0.88 (95% CI: 0.85-0.91) for recent quitters, long-term quitters, and non-smokers, respectively, compared with current smokers. HR for hypertension, compared with current smokers, were 0.89 (95% CI: 0.84-0.94), 0.91 (95% CI: 0.85-0.97), and 0.99 (95% CI: 0.91-1.08) for long-term quitters with no waist gain, long-term quitters with waist gain of 0.1-5.0 cm, and long-term quitters with waist gain of ≥5.0 cm, respectively. CONCLUSIONS Long-term smoking cessation was significantly associated with decreased risk of hypertension, and long-term smoking cessation with no waist gain or less than 5.0 cm of waist gain was significantly associated with decreased risk of hypertension. However, more than 5.0 cm of waist gain can attenuate the effect of long-term smoking cessation on lowering the risk of hypertension.
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Affiliation(s)
- H J Lee
- Department of Statistics and Data Science, Yonsei University, Seoul, Republic of Korea
| | - J W Choi
- Health Insurance Research Institute, National Health Insurance Service, Wonju, Republic of Korea.
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Choi J, Ta Park V, Nguyen E, Jung A, Tsoh J. Understanding the caregiving experiences of Asian Indian, Chinese, Korean, and Vietnamese American family care partners of persons living with dementia. Aging Ment Health 2024; 28:473-481. [PMID: 37655598 DOI: 10.1080/13607863.2023.2252772] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/08/2023] [Accepted: 08/21/2023] [Indexed: 09/02/2023]
Abstract
OBJECTIVES Disparities impacting dementia health care exist in racial/ethnic minority groups, including Asian Americans, an understudied population in Alzheimer's disease and related dementias. The qualitative study explored caregiving experiences and potential cultural influences among Asian Indian, Chinese, Korean, and Vietnamese family care partners of persons living with dementia. METHODS We conducted focus groups and individual interviews with 32 care partners from these four Asian subgroups using Zoom, WeChat, or telephone. RESULTS Four themes emerged from the data: (1) Family obligations influencing caregiving decisions; (2) Evolving challenges related to dementia caregiving; (3) Caregiving burdens/negative impacts from caregiving (relationship burdens and emotional distress); and (4) Coping with their situation in their own ways (cognitive, behavioral, and social strategies).Conclusion: Cultural values (e.g. familism or filial piety) played a significant role in caregiving decisions and experiences. There was a need to raise public awareness of dementia and create culturally and linguistically appropriate training programs for this population.
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Affiliation(s)
- JiWon Choi
- Institute for Health & Aging/Department of Social and Behavioral Sciences, School of Nursing, University of California, San Francisco (UCSF), San Francisco, CA, USA
| | - Van Ta Park
- Community Health Systems, School of Nursing, UCSF, San Francisco, CA, USA
| | | | - Andrew Jung
- School of Public Health, University of California, Los Angeles, CA, USA
| | - Janice Tsoh
- Psychiatry & Behavioral Sciences, School of Medicine, UCSF, San Francisco, CA, USA
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Joung SY, Yim H, Lee D, Shim J, Yoo SY, Kim YH, Kim JS, Kim H, Hyeong SK, Kim J, Noh YY, Bae S, Park MJ, Choi JW, Lee CH. All-Solution-Processed High-Performance MoS 2 Thin-Film Transistors with a Quasi-2D Perovskite Oxide Dielectric. ACS Nano 2024; 18:1958-1968. [PMID: 38181200 DOI: 10.1021/acsnano.3c06972] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2024]
Abstract
Assembling solution-processed van der Waals (vdW) materials into thin films holds great promise for constructing large-scale, high-performance thin-film electronics, especially at low temperatures. While transition metal dichalcogenide thin films assembled in solution have shown potential as channel materials, fully solution-processed vdW electronics have not been achieved due to the absence of suitable dielectric materials and high-temperature processing. In this work, we report on all-solution-processedvdW thin-film transistors (TFTs) comprising molybdenum disulfides (MoS2) as the channel and Dion-Jacobson-phase perovskite oxides as the high-permittivity dielectric. The constituent layers are prepared as colloidal solutions through electrochemical exfoliation of bulk crystals, followed by sequential assembly into a semiconductor/dielectric heterostructure for TFT construction. Notably, all fabrication processes are carried out at temperatures below 250 °C. The fabricated MoS2 TFTs exhibit excellent device characteristics, including high mobility (>10 cm2 V-1 s-1) and an on/off ratio exceeding 106. Additionally, the use of a high-k dielectric allows for operation at low voltage (∼5 V) and leakage current (∼10-11 A), enabling low power consumption. Our demonstration of the low-temperature fabrication of high-performance TFTs presents a cost-effective and scalable approach for heterointegrated thin-film electronics.
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Affiliation(s)
- Su-Yeon Joung
- Department of Electrical and Computer Engineering, Seoul National University, Seoul 08826, Republic of Korea
| | - Haena Yim
- Electronic Materials Research Center, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea
| | - Donghun Lee
- KU-KIST Graduate School of Converging Science and Technology, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Jaehyung Shim
- KU-KIST Graduate School of Converging Science and Technology, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - So Yeon Yoo
- Electronic Materials Research Center, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea
| | - Yeon Ho Kim
- KU-KIST Graduate School of Converging Science and Technology, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Jin Seok Kim
- KU-KIST Graduate School of Converging Science and Technology, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Hyunjun Kim
- Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
| | - Seok-Ki Hyeong
- Functional Composite Materials Research Center, Korea Institute of Science and Technology, Chudong-ro 92, Bongdong-eup, Wanju-gun, Jeonbuk 55324, Republic of Korea
| | - Junhee Kim
- KU-KIST Graduate School of Converging Science and Technology, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Yong-Young Noh
- Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
| | - Sukang Bae
- Functional Composite Materials Research Center, Korea Institute of Science and Technology, Chudong-ro 92, Bongdong-eup, Wanju-gun, Jeonbuk 55324, Republic of Korea
- Department of JBNU-KIST Industry-Academia Convergence Research, Jeonbuk National University, Jeonbuk 54896, Republic of Korea
| | - Myung Jin Park
- National Institute for Nanomaterials Technology, 77, Cheongam-ro, Nam-gu, Pohang-si, Gyeongsangbuk-do 37673, Republic of Korea
| | - Ji-Won Choi
- Electronic Materials Research Center, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea
- Department of Nanomaterials Science and Engineering, Korea University of Science and Technology, Daejeon 34113, Republic of Korea
| | - Chul-Ho Lee
- Department of Electrical and Computer Engineering, Seoul National University, Seoul 08826, Republic of Korea
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Choi JW, Park JW, Choi WJ. Effects of hip joint kinematics on the effective pelvis stiffness and hip impact force during simulated sideways falls. J Biomech 2024; 162:111885. [PMID: 38039920 DOI: 10.1016/j.jbiomech.2023.111885] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Revised: 11/21/2023] [Accepted: 11/23/2023] [Indexed: 12/03/2023]
Abstract
Improved understanding is required on how hip fracture risk is influenced by landing configuration. We examined how hip impact dynamics was affected by hip joint kinematics during simulated sideways falls. Twelve young adults (7 males, 5 females) of mean age 23.5 (SD = 1.5) years, participated in pelvis release experiments. Trials were acquired with the hip flexed 15° and 30° for each of three hip rotations: +15° ("external rotation"), 0°, and -15° ("internal rotation"). During falls, force-deformation data of the pelvis were recorded. Outcome variables included the peak hip impact force (Fexperimental) and effective stiffness of the pelvis (k1st, ksecant, and kms) determined with different methods suggested in literature, and predicted hip impact force during a fall from standing height (F1st, Fsecant and Fms). The two-way repeated-measures ANOVA was used to test whether these variables were associated with hip joint angles. The Fexperimental, ksecant and Fsecant were associated with hip rotation (F = 5.587, p = 0.005; F = 9.278, p < 0.0005; F = 5.778, p = 0.004, respectively), and 15 %, 31 % and 17 % smaller in 15° external than internal rotation (848 versus 998 N; 24.6 versus 35.6 kN/m; 2,637 versus 3,170 N, respectively). However, none of the outcome variables were associated with hip flexion (p > 0.05). Furthermore, there were no interactions between the hip rotation and flexion for all outcome variables (p > 0.05). Our results provide insights on hip impact dynamics, which may help improve a hip model to assess hip fracture risk during a fall.
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Affiliation(s)
- J W Choi
- Injury Prevention and Biomechanics Laboratory, Department of Physical Therapy, Yonsei University, Wonju, Gangwon-do, South Korea
| | - J W Park
- Injury Prevention and Biomechanics Laboratory, Department of Physical Therapy, Yonsei University, Wonju, Gangwon-do, South Korea
| | - W J Choi
- Injury Prevention and Biomechanics Laboratory, Department of Physical Therapy, Yonsei University, Wonju, Gangwon-do, South Korea.
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Park SM, Yoon HG, Lee DB, Choi JW, Kwon HY, Won C. Topological magnetic structure generation using VAE-GAN hybrid model and discriminator-driven latent sampling. Sci Rep 2023; 13:20377. [PMID: 37989882 PMCID: PMC10663506 DOI: 10.1038/s41598-023-47866-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2023] [Accepted: 11/19/2023] [Indexed: 11/23/2023] Open
Abstract
Recently, deep generative models using machine intelligence are widely utilized to investigate scientific systems by generating scientific data. In this study, we experiment with a hybrid model of a variational autoencoder (VAE) and a generative adversarial network (GAN) to generate a variety of plausible two-dimensional magnetic topological structure data. Due to the topological properties in the system, numerous and diverse metastable magnetic structures exist, and energy and topological barriers separate them. Thus, generating a variety of plausible spin structures avoiding those barrier states is a challenging problem. The VAE-GAN hybrid model can present an effective approach to this problem because it brings the advantages of both VAE's diversity and GAN's fidelity. It allows one to perform various applications including searching a desired sample from a variety of valid samples. Additionally, we perform a discriminator-driven latent sampling (DDLS) using our hybrid model to improve the quality of generated samples. We confirm that DDLS generates various plausible data with large coverage, following the topological rules of the target system.
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Affiliation(s)
- S M Park
- Department of Physics, Kyung Hee University, Seoul, 02447, South Korea
| | - H G Yoon
- Department of Physics, Kyung Hee University, Seoul, 02447, South Korea
| | - D B Lee
- Department of Physics, Kyung Hee University, Seoul, 02447, South Korea
- Department of Battery-Smart Factory, Korea University, Seoul, 02841, South Korea
| | - J W Choi
- Center for Spintronics, Korea Institute of Science and Technology, Seoul, 02792, South Korea
| | - H Y Kwon
- Center for Spintronics, Korea Institute of Science and Technology, Seoul, 02792, South Korea.
| | - C Won
- Department of Physics, Kyung Hee University, Seoul, 02447, South Korea.
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Lee DB, Yoon HG, Park SM, Choi JW, Chen G, Kwon HY, Won C. Super-resolution of magnetic systems using deep learning. Sci Rep 2023; 13:11526. [PMID: 37460591 DOI: 10.1038/s41598-023-38335-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2023] [Accepted: 07/06/2023] [Indexed: 07/20/2023] Open
Abstract
We construct a deep neural network to enhance the resolution of spin structure images formed by spontaneous symmetry breaking in the magnetic systems. Through the deep neural network, an image is expanded to a super-resolution image and reduced to the original image size to be fitted with the input feed image. The network does not require ground truth images in the training process. Therefore, it can be applied when low-resolution images are provided as training datasets, while high-resolution images are not obtainable due to the intrinsic limitation of microscope techniques. To show the usefulness of the network, we train the network with two types of simulated magnetic structure images; one is from self-organized maze patterns made of chiral magnetic structures, and the other is from magnetic domains separated by walls that are topological defects of the system. The network successfully generates high-resolution images highly correlated with the exact solutions in both cases. To investigate the effectiveness and the differences between datasets, we study the network's noise tolerance and compare the networks' reliabilities. The network is applied with experimental data obtained by magneto-optical Kerr effect microscopy and spin-polarized low-energy electron microscopy.
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Affiliation(s)
- D B Lee
- Department of Physics, Kyung Hee University, Seoul, 02447, South Korea
- Department of Battery-Smart Factory, Korea University, Seoul, 02841, South Korea
| | - H G Yoon
- Department of Physics, Kyung Hee University, Seoul, 02447, South Korea
| | - S M Park
- Department of Physics, Kyung Hee University, Seoul, 02447, South Korea
| | - J W Choi
- Center for Spintronics, Korea Institute of Science and Technology, Seoul, 02792, South Korea
| | - G Chen
- National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing, 210093, China
- Collaborative Innovation Center of Advanced Microstructures, Nanjing, 210093, China
| | - H Y Kwon
- Center for Spintronics, Korea Institute of Science and Technology, Seoul, 02792, South Korea.
| | - C Won
- Department of Physics, Kyung Hee University, Seoul, 02447, South Korea.
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Yim H, Yoon C, Ryu A, Yoo SY, Kwon JY, Oh G, Kim S, Kee EH, Chae KH, Yoon JH, Park BH, Choi JW. Heterosynaptic Plasticity in a Vertical Two-Terminal Synaptic Device. Nano Lett 2023. [PMID: 37409775 DOI: 10.1021/acs.nanolett.3c01057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 07/07/2023]
Abstract
Vertical two-terminal synaptic devices based on resistive switching have shown great potential for emulating biological signal processing and implementing artificial intelligence learning circuitries. To mimic heterosynaptic behaviors in vertical two-terminal synaptic devices, an additional terminal is required for neuromodulator activity. However, adding an extra terminal, such as a gate of the field-effect transistor, may lead to low scalability. In this study, a vertical two-terminal Pt/bilayer Sr1.8Ag0.2Nb3O10 (SANO) nanosheet/Nb:SrTiO3 (Nb:STO) device emulates heterosynaptic plasticity by controlling the number of trap sites in the SANO nanosheet via modulation of the tunneling current. Similar to biological neuromodulation, we modulated the synaptic plasticity, pulsed pair facilitation, and cutoff frequency of a simple two-terminal device. Therefore, our synaptic device can add high-level learning such as associative learning to a neuromorphic system with a simple cross-bar array structure.
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Affiliation(s)
- Haena Yim
- Center for Electronic Materials, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea
| | - Chansoo Yoon
- Division of Quantum Phases and Devices, Department of Physics, Konkuk University, Seoul 05029, Republic of Korea
| | - Ahrom Ryu
- Center for Electronic Materials, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea
| | - So Yeon Yoo
- Center for Electronic Materials, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea
| | - Ju Young Kwon
- Center for Electronic Materials, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea
| | - Gwangtaek Oh
- Division of Quantum Phases and Devices, Department of Physics, Konkuk University, Seoul 05029, Republic of Korea
| | - Sohwi Kim
- Division of Quantum Phases and Devices, Department of Physics, Konkuk University, Seoul 05029, Republic of Korea
| | - Eun Hee Kee
- Division of Quantum Phases and Devices, Department of Physics, Konkuk University, Seoul 05029, Republic of Korea
| | - Keun Hwa Chae
- Advanced Analysis Center, Korea Institute of Science and Technology, Daejeon 34113, Republic of Korea
| | - Jung Ho Yoon
- Center for Electronic Materials, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea
| | - Bae Ho Park
- Division of Quantum Phases and Devices, Department of Physics, Konkuk University, Seoul 05029, Republic of Korea
| | - Ji-Won Choi
- Center for Electronic Materials, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea
- Division of Nano and Information Technology, KIST-School, University of Science and Technology, Seoul 02792, Republic of Korea
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Park HW, Choi JW, Joo KK, Kim NR, Shin CD. Estimating Fluor Emission Spectra Using Digital Image Analysis Compared to Spectrophotometer Measurements. Sensors (Basel) 2023; 23:s23094291. [PMID: 37177494 PMCID: PMC10181702 DOI: 10.3390/s23094291] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2023] [Revised: 04/13/2023] [Accepted: 04/24/2023] [Indexed: 05/15/2023]
Abstract
This paper describes a practical method for obtaining the spectra of lights emitted by a fluor in a liquid scintillator (LS) using a digital camera. The emission wavelength results obtained using a digital image were compared with those obtained using a fluorescence spectrophotometer. For general users, conventional spectrophotometers are expensive and difficult to access. Moreover, their experimental measurement setup and processes are highly complicated, and they require considerable care in handling. To overcome these limitations, a feasibility study was performed to obtain the emission spectrum through image analysis. Specifically, the emission spectrum of a fluor dissolved in a liquid scintillator was obtained using digital image analysis. An image processing method was employed to convert the light irradiated during camera exposure into wavelengths. Hue (H) and wavelength (W) are closely related. Thus, we obtained an H-W response curve in the 400~450 nm wavelength region, using a light-emitting diode. Another relevant advantage of the method described in this study is its non-invasiveness in sealed LS samples. Our results showed that this method has the potential to accurately investigate the emission wavelengths of fluor within acceptable uncertainties. We envision the use of this method to perform experiments in chemistry and physics laboratories in the future.
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Affiliation(s)
- Hyeon-Woo Park
- Center for Precision Neutrino Research, Department of Physics, Chonnam National University, Gwangju 61186, Republic of Korea
| | - Ji-Won Choi
- Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
| | - Kyung-Kwang Joo
- Center for Precision Neutrino Research, Department of Physics, Chonnam National University, Gwangju 61186, Republic of Korea
| | - Na-Ri Kim
- Center for Precision Neutrino Research, Department of Physics, Chonnam National University, Gwangju 61186, Republic of Korea
| | - Chang-Dong Shin
- High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
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Ryu A, Yim H, Yoo S, Park J, Lee DG, Lee JY, Song HC, Baek SH, Nahm S, Choi JW. Layer-Controlled Perovskite 2D Nanosheet Interlayer for the Energy Storage Performance of Nanocomposites. Small 2023:e2300526. [PMID: 37010008 DOI: 10.1002/smll.202300526] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2023] [Revised: 02/27/2023] [Indexed: 06/19/2023]
Abstract
Polymer-based nanocomposites are desirable materials for next-generation dielectric capacitors. 2D dielectric nanosheets have received significant attention as a filler. However, randomly spreading the 2D filler causes residual stresses and agglomerated defect sites in the polymer matrix, which leads to the growth of an electric tree, resulting in a more premature breakdown than expected. Therefore, realizing a well-aligned 2D nanosheet layer with a small amount is a key challenge; it can inhibit the growth of conduction paths without degrading the performance of the material. Here, an ultrathin Sr1.8 Bi0.2 Nb3 O10 (SBNO) nanosheet filler is added as a layer into poly(vinylidene fluoride) (PVDF) films via the Langmuir-Blodgett method. The structural properties, breakdown strength, and energy storage capacity of a PVDF and multilayer PVDF/SBNO/PVDF composites as a function of the thickness-controlled SBNO layer are examined. The seven-layered (only 14 nm) SBNO nanosheets thin film can sufficiently prevent the electrical path in the PVDF/SBNO/PVDF composite and shows a high energy density of 12.8 J cm-3 at 508 MV m-1 , which is significantly higher than that of the bare PVDF film (9.2 J cm-3 at 439 MV m-1 ). At present, this composite has the highest energy density among the polymer-based nanocomposites under the filler of thin thickness.
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Affiliation(s)
- Ahrom Ryu
- Electronic Materials Research Center, Korea Institute of Science and Technology, Seongbuk-gu, 02792, Seoul, Republic of Korea
- Department of Material Science and Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - Haena Yim
- Electronic Materials Research Center, Korea Institute of Science and Technology, Seongbuk-gu, 02792, Seoul, Republic of Korea
| | - Soyeon Yoo
- Electronic Materials Research Center, Korea Institute of Science and Technology, Seongbuk-gu, 02792, Seoul, Republic of Korea
- Department of Material Science and Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - Jiseul Park
- Electronic Materials Research Center, Korea Institute of Science and Technology, Seongbuk-gu, 02792, Seoul, Republic of Korea
| | - Dong-Gyu Lee
- Electronic Materials Research Center, Korea Institute of Science and Technology, Seongbuk-gu, 02792, Seoul, Republic of Korea
- Department of Material Science and Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - Jun Young Lee
- Electronic Materials Research Center, Korea Institute of Science and Technology, Seongbuk-gu, 02792, Seoul, Republic of Korea
| | - Hyun-Cheol Song
- KIST-SKKU Carbon-Neutral Research Center, Sungkyunkwan University, Suwon, 16419, Republic of Korea
- Division of Nano & Information Technology, KIST School, University of Science and Technology, Seoul, 02792, Republic of Korea
| | - Seung Hyub Baek
- Electronic Materials Research Center, Korea Institute of Science and Technology, Seongbuk-gu, 02792, Seoul, Republic of Korea
| | - Sahn Nahm
- Department of Material Science and Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - Ji-Won Choi
- Electronic Materials Research Center, Korea Institute of Science and Technology, Seongbuk-gu, 02792, Seoul, Republic of Korea
- Division of Nano & Information Technology, KIST School, University of Science and Technology, Seoul, 02792, Republic of Korea
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Choe YR, Choi JW, Jeong JR, Doh HM, Kim ML, Nam MS, Kho HJ, Park HY, Ahn HR, Kweon SS, Kim YI, Oh IJ. Effective Timing of Introducing an Inpatient Smoking Cessation Program to Cancer Patients. Yonsei Med J 2023; 64:251-258. [PMID: 36996896 PMCID: PMC10067796 DOI: 10.3349/ymj.2022.0499] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/15/2022] [Revised: 01/22/2023] [Accepted: 01/26/2023] [Indexed: 04/01/2023] Open
Abstract
PURPOSE We aimed to identify factors influencing smoking cessation success among cancer patients registered in an inpatient smoking cessation program at a single cancer center. MATERIALS AND METHODS The electronic medical records of enrolled patients with solid cancer were retrospectively reviewed. We evaluated factors associated with 6-month smoking cessation. RESULTS A total of 458 patients with cancer were included in this study. Their mean age was 62.9±10.3 years, and 56.3% of the participants had lung cancer. 193 (42.1%) had not yet begun their main treatment. The mean number of counseling sessions for the participants was 8.4±3.5, and 46 (10.0%) patients were prescribed smoking cessation medications. The 6-month smoking cessation success rate was 48.0%. Multivariate analysis showed that younger age (<65 years), cohabited status, early stage, and the number of counseling sessions were statistically significant factors affecting 6-month smoking cessation success (p<0.05). Initiation of a cessation program before cancer treatment was significantly associated with cessation success (odds ratio, 1.66; 95% confidence interval, 1.02-2.70; p=0.040). CONCLUSION Smoking cessation intervention must be considered when establishing a treatment plan immediately after a cancer diagnosis among smokers.
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Affiliation(s)
- Yu-Ri Choe
- Department of Family Medicine, Chonnam National University Hwasun Hospital, Hwasun, Korea
- Chonnam Tobacco Control Center, Chonnam National University Hwasun Hospital, Hwasun, Korea
- Department of Family Medicine, Chonnam National University Medical School, Gwangju, Korea
| | - Ji-Won Choi
- Department of Family Medicine, Chonnam National University Hwasun Hospital, Hwasun, Korea
| | - Ju-Ri Jeong
- Department of Family Medicine, Chonnam National University Hwasun Hospital, Hwasun, Korea
| | - Hye-Mi Doh
- Department of Family Medicine, Chonnam National University Hwasun Hospital, Hwasun, Korea
| | - Mi-Lee Kim
- Department of Family Medicine, Chonnam National University Hwasun Hospital, Hwasun, Korea
| | - Min-Seol Nam
- Chonnam Tobacco Control Center, Chonnam National University Hwasun Hospital, Hwasun, Korea
| | - Hee-Ji Kho
- Lung and Esophageal Cancer Clinic, Chonnam National University Hwasun Hospital, Hwasun, Korea
| | - Ha-Young Park
- Chonnam Tobacco Control Center, Chonnam National University Hwasun Hospital, Hwasun, Korea
- Department of Internal Medicine, Chonnam National University Medical School, Gwangju, Korea
| | - Hye-Ran Ahn
- Chonnam Tobacco Control Center, Chonnam National University Hwasun Hospital, Hwasun, Korea
- Department of Nursing, Nambu University, Gwangju, Korea
| | - Sun-Seog Kweon
- Chonnam Tobacco Control Center, Chonnam National University Hwasun Hospital, Hwasun, Korea
- Department of Preventive Medicine, Chonnam National University Medical School, Gwangju, Korea
| | - Yu-Il Kim
- Chonnam Tobacco Control Center, Chonnam National University Hwasun Hospital, Hwasun, Korea
- Department of Internal Medicine, Chonnam National University Medical School, Gwangju, Korea
| | - In-Jae Oh
- Chonnam Tobacco Control Center, Chonnam National University Hwasun Hospital, Hwasun, Korea
- Lung and Esophageal Cancer Clinic, Chonnam National University Hwasun Hospital, Hwasun, Korea
- Department of Internal Medicine, Chonnam National University Medical School, Gwangju, Korea.
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12
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Yang SY, Han AR, Choi JW, Kim KM, Kwon JS. Novel antibacterial and apatite forming restorative composite resin incorporated with hydrated calcium silicate. Biomater Res 2023; 27:25. [PMID: 36978203 PMCID: PMC10053114 DOI: 10.1186/s40824-023-00364-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2022] [Accepted: 03/15/2023] [Indexed: 03/30/2023] Open
Abstract
Abstract
Background
White Portland cement is a calcium silicate material. It exhibits antibacterial properties and is biocompatible. In addition, calcium silicate-based materials are known to release calcium ions and form apatite. The purpose of this study was to develop a novel bioactive restorative resin composite with antibacterial and apatite forming properties to prevent tooth caries at the interface of teeth and restorative materials, by incorporation of hydrated calcium silicate (hCS) derived from white Portland cement.
Methods
To prepare the experimental composite resins, a 30 wt% light-curable resin matrix and 70 wt% filler, which was mixed with hCS and silanized glass powder were prepared in following concentrations: 0, 17.5, 35.0, and 52.5 wt% hCS filler. The depth of cure, flexural strength, water sorption, solubility, and antibacterial effect were tested. After immersion in artificial saliva solution for 15, 30, 60, and 90 days, ion concentration by ICP-MS and apatite formation using SEM-EDS, Raman spectroscopy and XRD from experimental specimens were analyzed.
Results
All experimental groups showed clinically acceptable depths of cure and flexural strength for the use as the restorative composite resin. Water sorption, solubility, released Ca and Si ions increased with the addition of hCS to the experimental composite resin. Experimental groups containing hCS showed greater antibacterial effects compared with the 0 wt% hCS filler group (p < 0.05). The 52.5 wt% hCS filler group produced precipitates mainly composed of Ca and P detected as hydroxyapatite after immersion in artificial saliva solution for 30, 60, and 90 days.
Conclusions
This results show that composite resins containing hCS filler is effective in antibacterial effects. hCS has also apatite formation ability for reducing gap size of microleakage by accumulating hydroxyapatite precipitates at the restoration-tooth interface. Therefore, novel composite resin containing hCS is promising bioactive resin because of its clinically acceptable physiochemical properties, antibacterial properties, and self-sealing potential for prevention of microleakage for longer usage of restorations.
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Alkhoury L, Choi J, Chandran VD, De Carvalho GB, Pal S, Kam M. Dual Wavelength Photoplethysmography Framework for Heart Rate Calculation. Sensors (Basel) 2022; 22:9955. [PMID: 36560324 PMCID: PMC9782066 DOI: 10.3390/s22249955] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/29/2022] [Revised: 12/14/2022] [Accepted: 12/14/2022] [Indexed: 06/17/2023]
Abstract
The quality of heart rate (HR) measurements extracted from human photoplethysmography (PPG) signals are known to deteriorate under appreciable human motion. Auxiliary signals, such as accelerometer readings, are usually employed to detect and suppress motion artifacts. A 2019 study by Yifan Zhang and his coinvestigatorsused the noise components extracted from an infrared PPG signal to denoise a green PPG signal from which HR was extracted. Until now, this approach was only tested on "micro-motion" such as finger tapping. In this study, we extend this technique to allow accurate calculation of HR under high-intensity full-body repetitive "macro-motion". Our Dual Wavelength (DWL) framework was tested on PPG data collected from 14 human participants while running on a treadmill. The DWL method showed the following attributes: (1) it performed well under high-intensity full-body repetitive "macro-motion", exhibiting high accuracy in the presence of motion artifacts (as compared to the leading accelerometer-dependent HR calculation techniques TROIKA and JOSS); (2) it used only PPG signals; auxiliary signals such as accelerometer signals were not needed; and (3) it was computationally efficient, hence implementable in wearable devices. DWL yielded a Mean Absolute Error (MAE) of 1.22|0.57 BPM, Mean Absolute Error Percentage (MAEP) of 0.95|0.38%, and performance index (PI) (which is the frequency, in percent, of obtaining an HR estimate that is within ±5 BPM of the HR ground truth) of 95.88|4.9%. Moreover, DWL yielded a short computation period of 3.0|0.3 s to process a 360-second-long run.
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Affiliation(s)
- Ludvik Alkhoury
- Department of Electrical and Computer Engineering, Newark College of Engineering, New Jersey Institute of Technology, Newark, NJ 07102, USA
| | - JiWon Choi
- Department of Electrical and Computer Engineering, Newark College of Engineering, New Jersey Institute of Technology, Newark, NJ 07102, USA
| | - Vishnu D. Chandran
- Department of Biomedical Engineering, Newark College of Engineering, New Jersey Institute of Technology, Newark, NJ 07102, USA
| | - Gabriela B. De Carvalho
- Department of Biomedical Engineering, Newark College of Engineering, New Jersey Institute of Technology, Newark, NJ 07102, USA
| | - Saikat Pal
- Department of Electrical and Computer Engineering, Newark College of Engineering, New Jersey Institute of Technology, Newark, NJ 07102, USA
- Department of Biomedical Engineering, Newark College of Engineering, New Jersey Institute of Technology, Newark, NJ 07102, USA
| | - Moshe Kam
- Department of Electrical and Computer Engineering, Newark College of Engineering, New Jersey Institute of Technology, Newark, NJ 07102, USA
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14
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Park HW, Choi JW, Choi JY, Joo KK, Kim NR. Investigation of the Hue-Wavelength Response of a CMOS RGB-Based Image Sensor. Sensors (Basel) 2022; 22:s22239497. [PMID: 36502198 PMCID: PMC9739397 DOI: 10.3390/s22239497] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2022] [Revised: 11/30/2022] [Accepted: 12/02/2022] [Indexed: 05/27/2023]
Abstract
In this study, a non-linear hue-wavelength (H-W) curve was investigated from 400 to 650 nm. To date, no study has reported on H-W relationship measurements, especially down to the 400 nm region. A digital camera mounted with complementary metal oxide semiconductor (CMOS) image sensors was used. The obtained digital images of the sample were based on an RGB-based imaging analysis rather than multispectral imaging or hyperspectral imaging. In this study, we focused on the raw image to reconstruct the H-W curve. In addition, several factors affecting the digital image, such as exposure time or international organization for standardization (ISO), were investigated. In addition, cross check of the H-W response using laser was performed. We expect that our method will be useful as an auxiliary method in the future for obtaining the fluor emission wavelength information.
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Affiliation(s)
- Hyeon-Woo Park
- Center for Precision Neutrino Research, Department of Physics, Chonnam National University, Yongbong-ro 77, Puk-gu, Gwangju 61186, Republic of Korea
| | - Ji-Won Choi
- Center for Precision Neutrino Research, Department of Physics, Chonnam National University, Yongbong-ro 77, Puk-gu, Gwangju 61186, Republic of Korea
| | - Ji-Young Choi
- Department of Fire Safety, Seoyeong University, Seogang-ro 1, Puk-gu, Gwangju 61268, Republic of Korea
| | - Kyung-Kwang Joo
- Center for Precision Neutrino Research, Department of Physics, Chonnam National University, Yongbong-ro 77, Puk-gu, Gwangju 61186, Republic of Korea
| | - Na-Ri Kim
- Center for Precision Neutrino Research, Department of Physics, Chonnam National University, Yongbong-ro 77, Puk-gu, Gwangju 61186, Republic of Korea
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15
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Cheng J, Tsoh JY, Guan A, Luu M, Nguyen IV, Tan R, Thao C, Yu E, Lor D, Pham M, Choi J, Kim M, Stewart SL, Burke NJ. Engaging Asian American Communities During the COVID-19 Era Tainted With Anti-Asian Hate and Distrust. Am J Public Health 2022; 112:S864-S868. [PMID: 36108257 PMCID: PMC9707711 DOI: 10.2105/ajph.2022.306952] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/06/2022] [Indexed: 09/07/2023]
Affiliation(s)
- Joyce Cheng
- Joyce Cheng and Rose Tan are with the Chinese Community Health Resource Center, San Francisco, CA. Janice Y. Tsoh, Isabel V. Nguyen, and Edgar Yu are with the Department of Psychiatry and Behavioral Sciences, University of California, San Francisco. Alice Guan is with the Department of Epidemiology and Biostatistics, University of California, San Francisco. Michelle Luu is with the Department of Medicine, University of California, San Francisco. Chia Thao and Nancy J. Burke are with the Department of Public Health, School of Social Sciences, Humanities, & Arts, University of California, Merced. Dao Lor is with The Fresno Center, Fresno, CA. Mai Pham is with the Immigrant Resettlement and Cultural Center, Inc, San Jose, CA. JiWon Choi is with the Institute for Health & Aging, University of California, San Francisco. Minji Kim is with the Department of Health Promotion, Education, and Behavior, Arnold School of Public Health, University of South Carolina, Columbia. Susan L. Stewart is with the Division of Biostatistics, University of California, Davis
| | - Janice Y Tsoh
- Joyce Cheng and Rose Tan are with the Chinese Community Health Resource Center, San Francisco, CA. Janice Y. Tsoh, Isabel V. Nguyen, and Edgar Yu are with the Department of Psychiatry and Behavioral Sciences, University of California, San Francisco. Alice Guan is with the Department of Epidemiology and Biostatistics, University of California, San Francisco. Michelle Luu is with the Department of Medicine, University of California, San Francisco. Chia Thao and Nancy J. Burke are with the Department of Public Health, School of Social Sciences, Humanities, & Arts, University of California, Merced. Dao Lor is with The Fresno Center, Fresno, CA. Mai Pham is with the Immigrant Resettlement and Cultural Center, Inc, San Jose, CA. JiWon Choi is with the Institute for Health & Aging, University of California, San Francisco. Minji Kim is with the Department of Health Promotion, Education, and Behavior, Arnold School of Public Health, University of South Carolina, Columbia. Susan L. Stewart is with the Division of Biostatistics, University of California, Davis
| | - Alice Guan
- Joyce Cheng and Rose Tan are with the Chinese Community Health Resource Center, San Francisco, CA. Janice Y. Tsoh, Isabel V. Nguyen, and Edgar Yu are with the Department of Psychiatry and Behavioral Sciences, University of California, San Francisco. Alice Guan is with the Department of Epidemiology and Biostatistics, University of California, San Francisco. Michelle Luu is with the Department of Medicine, University of California, San Francisco. Chia Thao and Nancy J. Burke are with the Department of Public Health, School of Social Sciences, Humanities, & Arts, University of California, Merced. Dao Lor is with The Fresno Center, Fresno, CA. Mai Pham is with the Immigrant Resettlement and Cultural Center, Inc, San Jose, CA. JiWon Choi is with the Institute for Health & Aging, University of California, San Francisco. Minji Kim is with the Department of Health Promotion, Education, and Behavior, Arnold School of Public Health, University of South Carolina, Columbia. Susan L. Stewart is with the Division of Biostatistics, University of California, Davis
| | - Michelle Luu
- Joyce Cheng and Rose Tan are with the Chinese Community Health Resource Center, San Francisco, CA. Janice Y. Tsoh, Isabel V. Nguyen, and Edgar Yu are with the Department of Psychiatry and Behavioral Sciences, University of California, San Francisco. Alice Guan is with the Department of Epidemiology and Biostatistics, University of California, San Francisco. Michelle Luu is with the Department of Medicine, University of California, San Francisco. Chia Thao and Nancy J. Burke are with the Department of Public Health, School of Social Sciences, Humanities, & Arts, University of California, Merced. Dao Lor is with The Fresno Center, Fresno, CA. Mai Pham is with the Immigrant Resettlement and Cultural Center, Inc, San Jose, CA. JiWon Choi is with the Institute for Health & Aging, University of California, San Francisco. Minji Kim is with the Department of Health Promotion, Education, and Behavior, Arnold School of Public Health, University of South Carolina, Columbia. Susan L. Stewart is with the Division of Biostatistics, University of California, Davis
| | - Isabel V Nguyen
- Joyce Cheng and Rose Tan are with the Chinese Community Health Resource Center, San Francisco, CA. Janice Y. Tsoh, Isabel V. Nguyen, and Edgar Yu are with the Department of Psychiatry and Behavioral Sciences, University of California, San Francisco. Alice Guan is with the Department of Epidemiology and Biostatistics, University of California, San Francisco. Michelle Luu is with the Department of Medicine, University of California, San Francisco. Chia Thao and Nancy J. Burke are with the Department of Public Health, School of Social Sciences, Humanities, & Arts, University of California, Merced. Dao Lor is with The Fresno Center, Fresno, CA. Mai Pham is with the Immigrant Resettlement and Cultural Center, Inc, San Jose, CA. JiWon Choi is with the Institute for Health & Aging, University of California, San Francisco. Minji Kim is with the Department of Health Promotion, Education, and Behavior, Arnold School of Public Health, University of South Carolina, Columbia. Susan L. Stewart is with the Division of Biostatistics, University of California, Davis
| | - Rose Tan
- Joyce Cheng and Rose Tan are with the Chinese Community Health Resource Center, San Francisco, CA. Janice Y. Tsoh, Isabel V. Nguyen, and Edgar Yu are with the Department of Psychiatry and Behavioral Sciences, University of California, San Francisco. Alice Guan is with the Department of Epidemiology and Biostatistics, University of California, San Francisco. Michelle Luu is with the Department of Medicine, University of California, San Francisco. Chia Thao and Nancy J. Burke are with the Department of Public Health, School of Social Sciences, Humanities, & Arts, University of California, Merced. Dao Lor is with The Fresno Center, Fresno, CA. Mai Pham is with the Immigrant Resettlement and Cultural Center, Inc, San Jose, CA. JiWon Choi is with the Institute for Health & Aging, University of California, San Francisco. Minji Kim is with the Department of Health Promotion, Education, and Behavior, Arnold School of Public Health, University of South Carolina, Columbia. Susan L. Stewart is with the Division of Biostatistics, University of California, Davis
| | - Chia Thao
- Joyce Cheng and Rose Tan are with the Chinese Community Health Resource Center, San Francisco, CA. Janice Y. Tsoh, Isabel V. Nguyen, and Edgar Yu are with the Department of Psychiatry and Behavioral Sciences, University of California, San Francisco. Alice Guan is with the Department of Epidemiology and Biostatistics, University of California, San Francisco. Michelle Luu is with the Department of Medicine, University of California, San Francisco. Chia Thao and Nancy J. Burke are with the Department of Public Health, School of Social Sciences, Humanities, & Arts, University of California, Merced. Dao Lor is with The Fresno Center, Fresno, CA. Mai Pham is with the Immigrant Resettlement and Cultural Center, Inc, San Jose, CA. JiWon Choi is with the Institute for Health & Aging, University of California, San Francisco. Minji Kim is with the Department of Health Promotion, Education, and Behavior, Arnold School of Public Health, University of South Carolina, Columbia. Susan L. Stewart is with the Division of Biostatistics, University of California, Davis
| | - Edgar Yu
- Joyce Cheng and Rose Tan are with the Chinese Community Health Resource Center, San Francisco, CA. Janice Y. Tsoh, Isabel V. Nguyen, and Edgar Yu are with the Department of Psychiatry and Behavioral Sciences, University of California, San Francisco. Alice Guan is with the Department of Epidemiology and Biostatistics, University of California, San Francisco. Michelle Luu is with the Department of Medicine, University of California, San Francisco. Chia Thao and Nancy J. Burke are with the Department of Public Health, School of Social Sciences, Humanities, & Arts, University of California, Merced. Dao Lor is with The Fresno Center, Fresno, CA. Mai Pham is with the Immigrant Resettlement and Cultural Center, Inc, San Jose, CA. JiWon Choi is with the Institute for Health & Aging, University of California, San Francisco. Minji Kim is with the Department of Health Promotion, Education, and Behavior, Arnold School of Public Health, University of South Carolina, Columbia. Susan L. Stewart is with the Division of Biostatistics, University of California, Davis
| | - Dao Lor
- Joyce Cheng and Rose Tan are with the Chinese Community Health Resource Center, San Francisco, CA. Janice Y. Tsoh, Isabel V. Nguyen, and Edgar Yu are with the Department of Psychiatry and Behavioral Sciences, University of California, San Francisco. Alice Guan is with the Department of Epidemiology and Biostatistics, University of California, San Francisco. Michelle Luu is with the Department of Medicine, University of California, San Francisco. Chia Thao and Nancy J. Burke are with the Department of Public Health, School of Social Sciences, Humanities, & Arts, University of California, Merced. Dao Lor is with The Fresno Center, Fresno, CA. Mai Pham is with the Immigrant Resettlement and Cultural Center, Inc, San Jose, CA. JiWon Choi is with the Institute for Health & Aging, University of California, San Francisco. Minji Kim is with the Department of Health Promotion, Education, and Behavior, Arnold School of Public Health, University of South Carolina, Columbia. Susan L. Stewart is with the Division of Biostatistics, University of California, Davis
| | - Mai Pham
- Joyce Cheng and Rose Tan are with the Chinese Community Health Resource Center, San Francisco, CA. Janice Y. Tsoh, Isabel V. Nguyen, and Edgar Yu are with the Department of Psychiatry and Behavioral Sciences, University of California, San Francisco. Alice Guan is with the Department of Epidemiology and Biostatistics, University of California, San Francisco. Michelle Luu is with the Department of Medicine, University of California, San Francisco. Chia Thao and Nancy J. Burke are with the Department of Public Health, School of Social Sciences, Humanities, & Arts, University of California, Merced. Dao Lor is with The Fresno Center, Fresno, CA. Mai Pham is with the Immigrant Resettlement and Cultural Center, Inc, San Jose, CA. JiWon Choi is with the Institute for Health & Aging, University of California, San Francisco. Minji Kim is with the Department of Health Promotion, Education, and Behavior, Arnold School of Public Health, University of South Carolina, Columbia. Susan L. Stewart is with the Division of Biostatistics, University of California, Davis
| | - JiWon Choi
- Joyce Cheng and Rose Tan are with the Chinese Community Health Resource Center, San Francisco, CA. Janice Y. Tsoh, Isabel V. Nguyen, and Edgar Yu are with the Department of Psychiatry and Behavioral Sciences, University of California, San Francisco. Alice Guan is with the Department of Epidemiology and Biostatistics, University of California, San Francisco. Michelle Luu is with the Department of Medicine, University of California, San Francisco. Chia Thao and Nancy J. Burke are with the Department of Public Health, School of Social Sciences, Humanities, & Arts, University of California, Merced. Dao Lor is with The Fresno Center, Fresno, CA. Mai Pham is with the Immigrant Resettlement and Cultural Center, Inc, San Jose, CA. JiWon Choi is with the Institute for Health & Aging, University of California, San Francisco. Minji Kim is with the Department of Health Promotion, Education, and Behavior, Arnold School of Public Health, University of South Carolina, Columbia. Susan L. Stewart is with the Division of Biostatistics, University of California, Davis
| | - Minji Kim
- Joyce Cheng and Rose Tan are with the Chinese Community Health Resource Center, San Francisco, CA. Janice Y. Tsoh, Isabel V. Nguyen, and Edgar Yu are with the Department of Psychiatry and Behavioral Sciences, University of California, San Francisco. Alice Guan is with the Department of Epidemiology and Biostatistics, University of California, San Francisco. Michelle Luu is with the Department of Medicine, University of California, San Francisco. Chia Thao and Nancy J. Burke are with the Department of Public Health, School of Social Sciences, Humanities, & Arts, University of California, Merced. Dao Lor is with The Fresno Center, Fresno, CA. Mai Pham is with the Immigrant Resettlement and Cultural Center, Inc, San Jose, CA. JiWon Choi is with the Institute for Health & Aging, University of California, San Francisco. Minji Kim is with the Department of Health Promotion, Education, and Behavior, Arnold School of Public Health, University of South Carolina, Columbia. Susan L. Stewart is with the Division of Biostatistics, University of California, Davis
| | - Susan L Stewart
- Joyce Cheng and Rose Tan are with the Chinese Community Health Resource Center, San Francisco, CA. Janice Y. Tsoh, Isabel V. Nguyen, and Edgar Yu are with the Department of Psychiatry and Behavioral Sciences, University of California, San Francisco. Alice Guan is with the Department of Epidemiology and Biostatistics, University of California, San Francisco. Michelle Luu is with the Department of Medicine, University of California, San Francisco. Chia Thao and Nancy J. Burke are with the Department of Public Health, School of Social Sciences, Humanities, & Arts, University of California, Merced. Dao Lor is with The Fresno Center, Fresno, CA. Mai Pham is with the Immigrant Resettlement and Cultural Center, Inc, San Jose, CA. JiWon Choi is with the Institute for Health & Aging, University of California, San Francisco. Minji Kim is with the Department of Health Promotion, Education, and Behavior, Arnold School of Public Health, University of South Carolina, Columbia. Susan L. Stewart is with the Division of Biostatistics, University of California, Davis
| | - Nancy J Burke
- Joyce Cheng and Rose Tan are with the Chinese Community Health Resource Center, San Francisco, CA. Janice Y. Tsoh, Isabel V. Nguyen, and Edgar Yu are with the Department of Psychiatry and Behavioral Sciences, University of California, San Francisco. Alice Guan is with the Department of Epidemiology and Biostatistics, University of California, San Francisco. Michelle Luu is with the Department of Medicine, University of California, San Francisco. Chia Thao and Nancy J. Burke are with the Department of Public Health, School of Social Sciences, Humanities, & Arts, University of California, Merced. Dao Lor is with The Fresno Center, Fresno, CA. Mai Pham is with the Immigrant Resettlement and Cultural Center, Inc, San Jose, CA. JiWon Choi is with the Institute for Health & Aging, University of California, San Francisco. Minji Kim is with the Department of Health Promotion, Education, and Behavior, Arnold School of Public Health, University of South Carolina, Columbia. Susan L. Stewart is with the Division of Biostatistics, University of California, Davis
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Choi JW, Alkhoury L, Urbano LF, Masson P, VerMilyea M, Kam M. An assessment tool for computer-assisted semen analysis (CASA) algorithms. Sci Rep 2022; 12:16830. [PMID: 36207362 PMCID: PMC9546881 DOI: 10.1038/s41598-022-20943-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2022] [Accepted: 09/21/2022] [Indexed: 11/09/2022] Open
Abstract
Computer-Assisted Semen Analysis (CASA) enables reliable analysis of semen images, and is designed to process large number of images with high consistency, accuracy, and repeatability. Design and testing of CASA algorithms can be accelerated greatly if reliable simulations of semen images under a variety of conditions and sample quality modes are available. Using life-like simulation of semen images can quantify the performance of existing and proposed CASA algorithms, since the parameters of the simulated image are known and controllable. We present simulation models for sperm cell image and swimming modes observed in real 2D (top-down) images of sperm cells in laboratory specimen. The models simulate human sperm using four (4) types of swimming, namely linear mean, circular, hyperactive, and immotile (or dead). The simulation models are used in studying algorithms for segmentation, localization, and tracking of sperm cells. Several segmentation and localization algorithms were tested under varying levels of noise, and then compared using precision, recall, and the optimal subpattern assignment (OSPA) metric. Images of real human semen sample were used to validate the segmentation and localization observations obtained from simulations. An example is given of sperm cell tracking on simulated semen images of cells using the different tracking algorithms (nearest neighbor (NN), global nearest neighbor (GNN), probabilistic data association filter (PDAF), and joint probabilistic data association filter (JPDAF)). Tracking performance was evaluated through multi-object tracking precision (MOTP) and multi-object tracking accuracy (MOTA). Simulation models enable objective assessments of semen image processing algorithms. We demonstrate the use of a new simulation tool to assess and compare segmentation, localization, and tracking methods. The simulation software allows testing along a large spectrum of parameter values that control the appearance and behavior of simulated semen images. Users can generate scenarios of different characteristics and assess the effectiveness of different CASA algorithms in these environments. The simulation was used to assess and compare algorithms for segmentation and tracking of sperm cells in semen images.
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Affiliation(s)
- Ji-Won Choi
- Department of Electrical and Computer Engineering, New Jersey Institute of Technology, Newark, NJ, 07102, USA
| | - Ludvik Alkhoury
- Department of Electrical and Computer Engineering, New Jersey Institute of Technology, Newark, NJ, 07102, USA
| | - Leonardo F Urbano
- Department of Electrical and Computer Engineering, Drexel University, Philadelphia, PA, 19104, USA
| | - Puneet Masson
- Penn Fertility Care, Hospital of the University of Pennsylvania, Philadelphia, PA, 19104, USA
| | | | - Moshe Kam
- Department of Electrical and Computer Engineering, New Jersey Institute of Technology, Newark, NJ, 07102, USA.
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17
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Park HW, Choi JW, Choi JY, Joo KK, Kim NR. The Spectrum of Light Emitted by LED Using a CMOS Sensor-Based Digital Camera and Its Application. Sensors (Basel) 2022; 22:6418. [PMID: 36080877 PMCID: PMC9460717 DOI: 10.3390/s22176418] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Revised: 08/18/2022] [Accepted: 08/23/2022] [Indexed: 06/15/2023]
Abstract
We introduced a digital photo image analysis in color space to estimate the spectrum of fluor components dissolved in a liquid scintillator sample through the hue and wavelength relationship. Complementary metal oxide semiconductor (CMOS) image sensors with Bayer color filter array (CFA) technology in the digital camera were used to reconstruct and decode color images. Hue and wavelength are closely related. To date, no literature has reported the hue and wavelength relationship measurements, especially for blue or close to the UV region. The non-linear hue and wavelength relationship in the blue region was investigated using a light emitting diode source. We focused on this wavelength region, because the maximum quantum efficiency of the bi-alkali photomultiplier tube (PMT) is around 430 nm. It is necessary to have a good understanding of this wavelength region in PMT-based experiments. The CMOS Bayer CFA approach was sufficient to estimate the fluor emission spectrum in the liquid scintillator sample without using an expensive spectrophotometer.
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Affiliation(s)
- Hyeon-Woo Park
- Center for Precision Neutrino Research, Department of Physics, Chonnam National University, Yongbong-ro 77, Puk-gu, Gwangju 61186, Korea
| | - Ji-Won Choi
- Center for Precision Neutrino Research, Department of Physics, Chonnam National University, Yongbong-ro 77, Puk-gu, Gwangju 61186, Korea
| | - Ji-Young Choi
- Department of Fire Safety, Seoyeong University, Seogang-ro 1, Puk-gu, Gwangju 61268, Korea
| | - Kyung-Kwang Joo
- Center for Precision Neutrino Research, Department of Physics, Chonnam National University, Yongbong-ro 77, Puk-gu, Gwangju 61186, Korea
| | - Na-Ri Kim
- Center for Precision Neutrino Research, Department of Physics, Chonnam National University, Yongbong-ro 77, Puk-gu, Gwangju 61186, Korea
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18
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Choi JW, Choi JY, Jang H, Joo KK, Kim BC. Pixel Image Analysis and Its Application with an Alcohol-Based Liquid Scintillator for Particle Therapy. Sensors (Basel) 2022; 22:4876. [PMID: 35808370 PMCID: PMC9269500 DOI: 10.3390/s22134876] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/17/2022] [Revised: 06/09/2022] [Accepted: 06/23/2022] [Indexed: 06/15/2023]
Abstract
We synthesized an alcohol-based liquid scintillator (AbLS), and we implemented an auxiliary monitoring system with short calibration intervals using AbLS for particle therapy. The commercial liquid scintillator used in previous studies did not allow the user to control the chemical ratio and its composition. In our study, the chemical ratio of AbLS was freely controlled by simultaneously mixing water and alcohol. To make an equivalent substance to the human body, 2-ethoxyethanol was used. There was no significant difference between AbLS and water in areal density. As an application of AbLS, the range was measured with AbLS using an electron beam in an image analysis that combined AbLS and a digital phone camera. Given a range-energy relationship for the electron expressed as areal density, the electron beam range (cm) in water can be easily estimated. To date, no literature report for the direct comparison of a pixel image analysis and Monte Carlo (MC) simulation has been published. Furthermore, optical tomography of the inverse problem was performed with AbLS and a mobile phone camera. Analyses of optical tomography images provide deeper insight into Radon transformation. In addition, the human phantom, which is difficult to compose with semiconductor diodes, was easily implemented as an image acquisition and analysis system.
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Affiliation(s)
- Ji-Won Choi
- Institute for Universe & Elementary Particles, Department of Physics, Chonnam National University, Yongbong-ro 77, Puk-gu, Gwangju 61186, Korea;
| | - Ji-Young Choi
- Department of Fire Safety, Seoyeong University, Seogang-ro 1, Puk-gu, Gwangju 61268, Korea;
| | - Hanil Jang
- Department of Fire Safety, Seoyeong University, Seogang-ro 1, Puk-gu, Gwangju 61268, Korea;
| | - Kyung-Kwang Joo
- Institute for Universe & Elementary Particles, Department of Physics, Chonnam National University, Yongbong-ro 77, Puk-gu, Gwangju 61186, Korea;
| | - Byoung-Chan Kim
- Medical Radiation, Wonkwang Health Science University, 514, Iksan-daero, Iksan-si 54538, Korea
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19
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Han M, Choi JW, Jung WS, Lee JS. Isolated posterior inferior cerebellar artery dissection with ischaemic stroke: evaluating the radiological features and diagnostic feasibility of high-resolution vessel wall imaging. Clin Radiol 2022; 77:584-591. [PMID: 35676104 DOI: 10.1016/j.crad.2022.05.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Accepted: 05/06/2022] [Indexed: 11/29/2022]
Abstract
AIM To evaluate the radiological features of isolated posterior inferior cerebellar artery dissection (PICAD) and the feasibility of using high-resolution vessel-wall imaging (HR-VWI) for diagnosing PICAD. MATERIALS AND METHODS Three hundred and nine patients with arterial dissection involving the posterior cerebral circulation, who underwent HR-VWI between March 2012 and July 2019 were reviewed retrospectively. Among them, 44 patients (14.2%) were diagnosed with isolated PICAD in consensus among a neuroradiologist, a neurointerventionist, and a neurologist. Two neuroradiologists reviewed the vessel wall images independently for evidence of dissection (dissection flap, outer diameter enlargement on T2-weighted imaging [WI], mural haematoma). Diagnostic confidence was also scored on a five-point scale. Intra- and interobserver agreement for diagnosing PICAD and detecting evidence of dissection were evaluated. RESULTS Dissection flaps were seen on T2WI in all cases (100%) and on contrast-enhanced T1WI in 34 patients (79.1%). Outer diameter enlargement of the steno-occlusive lesions on angiography was detected in most cases (97.7%). A mural haematoma was detected on three-dimensional (3D) contrast-enhanced motion-sensitised driven-equilibrium T1WI in 97.1% of the cases. The mean diagnostic confidence score derived by two neuroradiologists was 4.72. The two reviewers showed substantial to almost perfect agreement (weighted kappa coefficient: 0.62-0.97). CONCLUSION Use of HR-VWI as a diagnostic tool for PICAD is feasible, and a dissection flap with outer wall enlargement on HR-T2WI allows confident dissection diagnosis. The present data suggest that PICAD might be considered as a stroke aetiology in patients with unexplained ischaemic stroke in the PICA territory, and that PICA evaluation with HR-VWI is both necessary and feasible.
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Affiliation(s)
- M Han
- Department of Radiology, Ajou University School of Medicine, Ajou University Hospital, Suwon, Republic of Korea; Department of Radiology, Graduate School of Kangwon National University, Chuncheon, Republic of Korea
| | - J W Choi
- Department of Radiology, Ajou University School of Medicine, Ajou University Hospital, Suwon, Republic of Korea.
| | - W S Jung
- Department of Radiology, Ajou University School of Medicine, Ajou University Hospital, Suwon, Republic of Korea; Department of Radiology, Graduate School of Kangwon National University, Chuncheon, Republic of Korea
| | - J S Lee
- Department of Neurology, Ajou University School of Medicine, Ajou University Hospital, Suwon, Republic of Korea
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20
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Iaboni C, Lobo D, Choi JW, Abichandani P. Event-Based Motion Capture System for Online Multi-Quadrotor Localization and Tracking. Sensors 2022; 22:s22093240. [PMID: 35590931 PMCID: PMC9100634 DOI: 10.3390/s22093240] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/21/2022] [Revised: 04/20/2022] [Accepted: 04/20/2022] [Indexed: 12/04/2022]
Abstract
Motion capture systems are crucial in developing multi-quadrotor systems due to their ability to provide fast and accurate ground truth measurements for tracking and control. This paper presents the implementation details and experimental validation of a relatively low-cost motion-capture system for multi-quadrotor motion planning using an event camera. The real-time, multi-quadrotor detection and tracking tasks are performed using a deep learning network You-Only-Look-Once (YOLOv5) and a k-dimensional (k-d) tree, respectively. An optimization-based decentralized motion planning algorithm is implemented to demonstrate the effectiveness of this motion capture system. Extensive experimental evaluations were performed to (1) compare the performance of four deep-learning algorithms for high-speed multi-quadrotor detection on event-based data, (2) study precision, recall, and F1 scores as functions of lighting conditions and camera motion, and (3) investigate the scalability of this system as a function of the number of quadrotors flying in the arena. Comparative analysis of the deep learning algorithms on a consumer-grade GPU demonstrates a 4.8× to 12× sampling/inference rate advantage that YOLOv5 provides over representative one- and two-stage detectors and a 1.14× advantage over YOLOv4. In terms of precision and recall, YOLOv5 performed 15% to 18% and 27% to 41% better than representative state-of-the-art deep learning networks. Graceful detection and tracking performance degradation was observed in the face of progressively darker ambient light conditions. Despite severe camera motion, YOLOv5 precision and recall values of 94% and 98% were achieved, respectively. Finally, experiments involving up to six indoor quadrotors demonstrated the scalability of this approach. This paper also presents the first open-source event camera dataset in the literature, featuring over 10,000 fully annotated images of multiple quadrotors operating in indoor and outdoor environments.
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21
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Choi JW, Shin JY, Zhou Z, Kim DU, Kweon B, Oh H, Kim YC, Song HJ, Bae GS, Park SJ. Stem bark of Fraxinus rhynchophylla ameliorates the severity of pancreatic fibrosis by regulating the TGF-β/Smad signaling pathway. J Investig Med 2022; 70:1285-1292. [PMID: 35078865 DOI: 10.1136/jim-2021-002169] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/04/2022] [Indexed: 11/04/2022]
Abstract
Chronic pancreatitis (CP) is a pathological fibroinflammatory syndrome of the pancreas. Currently, there are no therapeutic agents available for treating CP-associated pancreatic fibrosis. Fraxinus rhynchophylla (FR) reportedly exhibits anti-inflammatory, antioxidative and antitumor activities. Although FR possesses numerous properties associated with the regulation of diverse diseases, the effects of FR on CP remain unknown. Herein, we examined the effects of FR on CP. For CP induction, mice were intraperitoneally administered cerulein (50 μg/kg) 6 times a day, 4 days per week for 3 weeks. FR extract (100 or 400 mg/kg) or saline (control group) was intraperitoneally injected 1 hour before the first cerulein injection. After 3 weeks, the pancreas was harvested for histological analysis. In addition, pancreatic stellate cells (PSCs) were isolated to examine the antifibrogenic effects and regulatory mechanisms of FR. Administration of FR significantly inhibited histological damage in the pancreas, increased pancreatic acinar cell survival, decreased PSC activation and collagen deposition, and decreased pro-inflammatory cytokines. Moreover, FR treatment inhibited the expression of fibrotic mediators, such as α-smooth muscle actin (α-SMA), collagen, fibronectin 1, and decreased pro-inflammatory cytokines in isolated PSCs stimulated with transforming growth factor (TGF)-β. Furthermore, FR treatment suppressed the phosphorylation of Smad 2/3 but not of Smad 1/5 in TGF-β-stimulated PSCs. Collectively, these results suggest that FR ameliorates pancreatic fibrosis by inhibiting PSC activation during CP.
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Affiliation(s)
- Ji-Won Choi
- Department of Herbology, School of Korean Medicine, Wonkwang University, Iksan, Jeollabuk-do, Republic of Korea.,Hanbang Cardio-Renal Syndrome Research Center, School of Korean Medicine, Wonkwang University, Iksan, Jeollabuk-do, Republic of Korea
| | - Joon Yeon Shin
- Department of Herbology, School of Korean Medicine, Wonkwang University, Iksan, Jeollabuk-do, Republic of Korea
| | - Ziqi Zhou
- Department of Herbology, School of Korean Medicine, Wonkwang University, Iksan, Jeollabuk-do, Republic of Korea
| | - Dong-Uk Kim
- Hanbang Cardio-Renal Syndrome Research Center, School of Korean Medicine, Wonkwang University, Iksan, Jeollabuk-do, Republic of Korea
| | - Bitna Kweon
- Department of Herbology, School of Korean Medicine, Wonkwang University, Iksan, Jeollabuk-do, Republic of Korea
| | - Hyuncheol Oh
- Institute of Pharmaceutical Research and Development, College of Pharmacy, WonkwangUniversity, Iksan, Jeollabuk-do, Republic of Korea
| | - Youn-Chul Kim
- Institute of Pharmaceutical Research and Development, College of Pharmacy, WonkwangUniversity, Iksan, Jeollabuk-do, Republic of Korea
| | - Ho-Joon Song
- Department of Herbology, School of Korean Medicine, Wonkwang University, Iksan, Jeollabuk-do, Republic of Korea
| | - Gi-Sang Bae
- Hanbang Cardio-Renal Syndrome Research Center, School of Korean Medicine, Wonkwang University, Iksan, Jeollabuk-do, Republic of Korea .,Department of Pharmacology, School of Korean Medicine, Wonkwang University, Iksan, Jeollabuk-do, Republic of Korea.,Research Center of Traditional Korean Medicine, Wonkwang University, Iksan, Jeollabuk-do, Republic of Korea
| | - Sung-Joo Park
- Department of Herbology, School of Korean Medicine, Wonkwang University, Iksan, Jeollabuk-do, Republic of Korea .,Hanbang Cardio-Renal Syndrome Research Center, School of Korean Medicine, Wonkwang University, Iksan, Jeollabuk-do, Republic of Korea
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22
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Choi J, Park VT, Vuong Q, Cheng J, Mukherjea A, Tsoh JY. Dementia family caregiving experience among Asian American older adults. Alzheimers Dement 2021. [DOI: 10.1002/alz.055055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- JiWon Choi
- University of California, San Francisco San Francisco CA USA
| | - Van Ta Park
- University of California, San Francisco San Francisco CA USA
| | - Quyen Vuong
- International Children Assistance Network Milpitas CA USA
| | - Joyce Cheng
- Chinese Community Health Resource Center San Francisco CA USA
| | | | - Janice Y Tsoh
- University of California, San Francisco San Francisco CA USA
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23
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Lee DB, Yoon HG, Park SM, Choi JW, Kwon HY, Won C. Estimating the effective fields of spin configurations using a deep learning technique. Sci Rep 2021; 11:22937. [PMID: 34824339 PMCID: PMC8616938 DOI: 10.1038/s41598-021-02374-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Accepted: 11/15/2021] [Indexed: 11/09/2022] Open
Abstract
The properties of complicated magnetic domain structures induced by various spin-spin interactions in magnetic systems have been extensively investigated in recent years. To understand the statistical and dynamic properties of complex magnetic structures, it is crucial to obtain information on the effective field distribution over the structure, which is not directly provided by magnetization. In this study, we use a deep learning technique to estimate the effective fields of spin configurations. We construct a deep neural network and train it with spin configuration datasets generated by Monte Carlo simulation. We show that the trained network can successfully estimate the magnetic effective field even though we do not offer explicit Hamiltonian parameter values. The estimated effective field information is highly applicable; it is utilized to reduce noise, correct defects in the magnetization data, generate spin configurations, estimate external field responses, and interpret experimental images.
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Affiliation(s)
- D B Lee
- Department of Physics, Kyung Hee University, Seoul, 02447, South Korea
| | - H G Yoon
- Department of Physics, Kyung Hee University, Seoul, 02447, South Korea
| | - S M Park
- Department of Physics, Kyung Hee University, Seoul, 02447, South Korea
| | - J W Choi
- Center for Spintronics, Korea Institute of Science and Technology, Seoul, 02792, South Korea
| | - H Y Kwon
- Center for Spintronics, Korea Institute of Science and Technology, Seoul, 02792, South Korea.
| | - C Won
- Department of Physics, Kyung Hee University, Seoul, 02447, South Korea.
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24
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Yang SY, Choi JW, Kim KM, Kwon JS. Evaluation of the time-dependent efficacy of commercial denture or orthodontic appliance cleansers: An in vitro study. Dent Mater J 2021; 41:214-225. [PMID: 34789624 DOI: 10.4012/dmj.2021-200] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The aim of this study was to evaluate the antimicrobial, stain and protein removal efficacy of denture or orthodontic appliance cleansers using in vitro test methods. Experimental cleansers were applied for experimental time in each evaluation method. To evaluate the microorganism removal efficacy, C. albicans and S. mutans removal rate was calculated from the specimen surface. Stain and protein removal rate was calculated using the spectrophotometer. Experimental cleansers significantly affected the microorganism removal rate for both C. albicans and S. mutans, as well as the stain and protein removal rates, at each experimental time (p<0.05). As the application time increased, the stain and protein removal rates of all experimental cleansers significantly increased (p<0.05). The present study provided in vitro evaluation methods to assess the efficacy of denture or orthodontic appliance cleansers. Also, manufacturers and researchers can predict clinical outcomes and ensure proper hygiene management of dentures or orthodontic appliances.
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Affiliation(s)
- Song-Yi Yang
- Department and Research Institute of Dental Biomaterials and Bioengineering, Yonsei University College of Dentistry
| | - Ji-Won Choi
- Department and Research Institute of Dental Biomaterials and Bioengineering, Yonsei University College of Dentistry.,BK21 FOUR Project, Yonsei University College of Dentistry
| | - Kwang-Mahn Kim
- Department and Research Institute of Dental Biomaterials and Bioengineering, Yonsei University College of Dentistry
| | - Jae-Sung Kwon
- Department and Research Institute of Dental Biomaterials and Bioengineering, Yonsei University College of Dentistry.,BK21 FOUR Project, Yonsei University College of Dentistry
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25
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Choi J, Shin NM, Cooper B, Jih J, Janice T. A Pilot Study to Promote Active Living among Physically Inactive Korean American Women. J Community Health Nurs 2021; 38:24-37. [PMID: 33682553 DOI: 10.1080/07370016.2021.1869420] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
A 4-week lifestyle program called Women's Active Living for Koreans (WALK) was designed for Korean American women to promote physical activity (PA). In a pilot-controlled trial, 40 women were randomized to WALK-regular or WALK-plus. WALK-plus involved joining an online community via a social media app. WALK-plus performed significantly higher numbers of days of muscle-strengthening activities than WALK-regular at the post-intervention visit. Both groups increased vigorous activities and walking and decreased sedentary behaviors on weekdays. WALK program showed great potential in improving PA and decreasing sedentary behaviors. Online social networking may have an additional effect on PA among this population.
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Affiliation(s)
- JiWon Choi
- Institute for Health & Aging/Department of Social and Behavioral Sciences, School of Nursing, University of California, San Francisco, California, USA
| | - Nah-Mee Shin
- College of Nursing, Korea University, Seoul, Korea
| | - Bruce Cooper
- School of Medicine, UCSF, San Francisco, California, USA
| | - Jane Jih
- School of Medicine, UCSF, San Francisco, California, USA
| | - Tsoh Janice
- Department of Psychiatry, School of Medicine, UCSF, San Francisco, California, USA
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26
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Alkhoury L, Choi JW, Wang C, Rajasekar A, Acharya S, Mahoney S, Shender BS, Hrebien L, Kam M. Heart-rate tuned comb filters for processing photoplethysmogram (PPG) signals in pulse oximetry. J Clin Monit Comput 2021; 35:797-813. [PMID: 32556842 PMCID: PMC8286955 DOI: 10.1007/s10877-020-00539-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2019] [Accepted: 05/26/2020] [Indexed: 11/27/2022]
Abstract
Calculation of peripheral capillary oxygen saturation [Formula: see text] levels in humans is often made with a pulse oximeter, using photoplethysmography (PPG) waveforms. However, measurements of PPG waveforms are susceptible to motion noise due to subject and sensor movements. In this study, we compare two [Formula: see text]-level calculation techniques, and measure the effect of pre-filtering by a heart-rate tuned comb peak filter on their performance. These techniques are: (1) "Red over Infrared," calculating the ratios of AC and DC components of the red and infrared PPG signals,[Formula: see text], followed by the use of a calibration curve to determine the [Formula: see text] level Webster (in: Design of pulse oximeters, CRC Press, Boca Raton, 1997); and (2) a motion-resistant algorithm which uses the Discrete Saturation Transform (DST) (Goldman in J Clin Monit Comput 16:475-83, 2000). The DST algorithm isolates individual "saturation components" in the optical pathway, which allows separation of components corresponding to the [Formula: see text] level from components corresponding to noise and interference, including motion artifacts. The comparison we provide here (employing the two techniques with and without pre-filtering) addresses two aspects: (1) accuracy of the [Formula: see text] calculations; and (2) computational complexity. We used both synthetic data and experimental data collected from human subjects. The human subjects were tested at rest and while exercising; while exercising, their measurements were subject to the impacts of motion. Our main conclusion is that if an uninterrupted high-quality heart rate measurement is available, then the "Red over Infrared" approach preceded by a heart-rate tuned comb filter provides the preferred trade-off between [Formula: see text]-level accuracy and computational complexity. A modest improvement in [Formula: see text] estimate accuracy at very low SNR environments may be achieved by switching to the pre-filtered DST-based algorithm (up to 6% improvement in [Formula: see text] level accuracy at -10 dB over unfiltered DST algorithm and the filtered "Red over Infrared" approach). However, this improvement comes at a significant computational cost.
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Affiliation(s)
- Ludvik Alkhoury
- Department of Electrical and Computer Engineering, Newark College of Engineering, New Jersey Institute of Technology, New Jersey, 07102, USA.
| | - Ji-Won Choi
- Department of Electrical and Computer Engineering, Newark College of Engineering, New Jersey Institute of Technology, New Jersey, 07102, USA
| | - Chizhong Wang
- Department of Electrical and Computer Engineering, Newark College of Engineering, New Jersey Institute of Technology, New Jersey, 07102, USA
| | - Arjun Rajasekar
- Department of Electrical and Computer Engineering, Drexel University, Philadelphia, PA, 19104, USA
| | - Sayandeep Acharya
- Department of Electrical and Computer Engineering, Drexel University, Philadelphia, PA, 19104, USA
| | - Sean Mahoney
- Regulatory Affairs Department, Athena GTX, Johnston, IA, 501131, USA
| | - Barry S Shender
- Human Systems Department, Naval Air Warfare Center Aircraft Division, Patuxent River, MD, 20670, USA
| | - Leonid Hrebien
- Department of Electrical and Computer Engineering, Drexel University, Philadelphia, PA, 19104, USA
| | - Moshe Kam
- Department of Electrical and Computer Engineering, Newark College of Engineering, New Jersey Institute of Technology, New Jersey, 07102, USA
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27
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Cooper CE, Bird M, Sheng X, Choi JW, Silkstone GGA, Simons M, Syrett N, Piano R, Ronda L, Bettati S, Paredi G, Mozzarelli A, Reeder BJ. Stability of Maleimide-PEG and Mono-Sulfone-PEG Conjugation to a Novel Engineered Cysteine in the Human Hemoglobin Alpha Subunit. Front Chem 2021; 9:707797. [PMID: 34381760 PMCID: PMC8350135 DOI: 10.3389/fchem.2021.707797] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2021] [Accepted: 07/07/2021] [Indexed: 12/14/2022] Open
Abstract
In order to use a Hemoglobin Based Oxygen Carrier as an oxygen therapeutic or blood substitute, it is necessary to increase the size of the hemoglobin molecule to prevent rapid renal clearance. A common method uses maleimide PEGylation of sulfhydryls created by the reaction of 2-iminothiolane at surface lysines. However, this creates highly heterogenous mixtures of molecules. We recently engineered a hemoglobin with a single novel, reactive cysteine residue on the surface of the alpha subunit creating a single PEGylation site (βCys93Ala/αAla19Cys). This enabled homogenous PEGylation by maleimide-PEG with >80% efficiency and no discernible effect on protein function. However, maleimide-PEG adducts are subject to deconjugation via retro-Michael reactions and cross-conjugation to endogenous thiol species in vivo. We therefore compared our maleimide-PEG adduct with one created using a mono-sulfone-PEG less susceptible to deconjugation. Mono-sulfone-PEG underwent reaction at αAla19Cys hemoglobin with > 80% efficiency, although some side reactions were observed at higher PEG:hemoglobin ratios; the adduct bound oxygen with similar affinity and cooperativity as wild type hemoglobin. When directly compared to maleimide-PEG, the mono-sulfone-PEG adduct was significantly more stable when incubated at 37°C for seven days in the presence of 1 mM reduced glutathione. Hemoglobin treated with mono-sulfone-PEG retained > 90% of its conjugation, whereas for maleimide-PEG < 70% of the maleimide-PEG conjugate remained intact. Although maleimide-PEGylation is certainly stable enough for acute therapeutic use as an oxygen therapeutic, for pharmaceuticals intended for longer vascular retention (weeks-months), reagents such as mono-sulfone-PEG may be more appropriate.
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Affiliation(s)
- Chris E Cooper
- School of Life Sciences, University of Essex, Colchester, United Kingdom
| | | | | | | | - Gary G A Silkstone
- School of Life Sciences, University of Essex, Colchester, United Kingdom
| | - Michelle Simons
- School of Life Sciences, University of Essex, Colchester, United Kingdom
| | - Natalie Syrett
- School of Life Sciences, University of Essex, Colchester, United Kingdom
| | - Riccardo Piano
- Department of Medicine and Surgery, University of Parma, Parma, Italy
| | - Luca Ronda
- Department of Medicine and Surgery, University of Parma, Parma, Italy.,Institute of Biophysics, National Research Council, Pisa, Italy
| | - Stefano Bettati
- Department of Medicine and Surgery, University of Parma, Parma, Italy.,Institute of Biophysics, National Research Council, Pisa, Italy
| | | | - Andrea Mozzarelli
- Institute of Biophysics, National Research Council, Pisa, Italy.,Department of Food and Drug, University of Parma, Parma, Italy
| | - Brandon J Reeder
- School of Life Sciences, University of Essex, Colchester, United Kingdom
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28
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Jang SH, Sohn SI, Park H, Lee SJ, Kim YW, Hong JM, Kim CH, Choi JW, Kang DH, Kim YS, Hwang YH, Lee JS, Hong JH. The Safety of Intra-arterial Tirofiban during Endovascular Therapy after Intravenous Thrombolysis. AJNR Am J Neuroradiol 2021; 42:1633-1637. [PMID: 34301637 DOI: 10.3174/ajnr.a7203] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2020] [Accepted: 04/07/2021] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE The safety and efficacy of tirofiban during endovascular therapy in patients undergoing intravenous thrombolysis with recombinant IV tPA remain unclear. This study aimed to investigate the safety and efficacy of intra-arterial tirofiban use during endovascular therapy in patients treated with IV tPA. MATERIALS AND METHODS Using a multicenter registry, we enrolled patients with acute ischemic stroke who underwent endovascular therapy. Safety outcomes included postprocedural parenchymal hematoma type 2 and/or thick subarachnoid hemorrhage, intraventricular hemorrhage, and 3-month mortality. Efficacy outcomes included the successful reperfusion rate, postprocedural reocclusion, and good outcomes at 3 months (mRS scores of 0-2). The tirofiban effect on the outcomes was evaluated using a multivariable analysis while adjusting for potential confounders. RESULTS Among enrolled patients, we identified 314 patients with stroke (279 and 35 patients in the no tirofiban and tirofiban groups, respectively) due to an intracranial artery occlusion who underwent endovascular therapy with intravenous thrombolysis. A multivariable analysis revealed no association of intra-arterial tirofiban with postprocedural parenchymal hematoma type and/or thick subarachnoid hemorrhage (adjusted OR, 1.07; 95% CI, 0.20-4.10; P = .918), intraventricular hemorrhage (adjusted OR, 0.43; 95% CI, 0.02-2.85; P = .467), and 3-month mortality (adjusted OR, 0.38; 95% CI, 0.04-1.87; P = .299). Intra-arterial tirofiban was not associated with good outcome (adjusted OR, 2.22; 95% CI, 0.89 -6.12; P = .099). CONCLUSIONS Using intra-arterial tirofiban during endovascular therapy after IV tPA could be safe.
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Affiliation(s)
- S H Jang
- From the Departments of Neurology (S.H.J., S.-I.S., H.P., J.-H.H.)
| | - S-I Sohn
- From the Departments of Neurology (S.H.J., S.-I.S., H.P., J.-H.H.)
| | - H Park
- From the Departments of Neurology (S.H.J., S.-I.S., H.P., J.-H.H.)
| | - S-J Lee
- Department of Neurology (S.-J.L., J.M.H., J.S.L.)
| | - Y-W Kim
- Department of Neurology (Y.-W.K., Y.-H.H.)
| | - J M Hong
- Department of Neurology (S.-J.L., J.M.H., J.S.L.)
| | - C-H Kim
- Neurosurgery (C.-H.K.), School of Medicine Keimyung University, Daegu, South Korea
| | - J W Choi
- Radiology (J.W.C.), School of Medicine, Ajou University, Suwon, South Korea
| | | | - Y-S Kim
- Radiology (Y.-S.K.), School of Medicine, Kyungpook National University, Daegu, South Korea
| | - Y-H Hwang
- Department of Neurology (Y.-W.K., Y.-H.H.)
| | - J S Lee
- Department of Neurology (S.-J.L., J.M.H., J.S.L.)
| | - J-H Hong
- From the Departments of Neurology (S.H.J., S.-I.S., H.P., J.-H.H.)
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Alkaid Albqoor M, Chen JL, Weiss S, Waters C, Choi JW. Serious psychological distress: A national study of Middle Eastern immigrants. J Psychiatr Ment Health Nurs 2021; 28:163-173. [PMID: 32363710 DOI: 10.1111/jpm.12646] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/14/2020] [Revised: 03/09/2020] [Accepted: 04/23/2020] [Indexed: 11/30/2022]
Abstract
WHAT IS KNOWN ON THE SUBJECT?: There is very limited literature on the health of Middle Eastern immigrants in the United States, and the available studies were mostly conducted on small convenient samples in local communities. There is also a need to understand changes in the rates of serious psychological distress (SPD) during the 15 years after 2001, as there were negative effects on Arabs' health since the September 2001 aftermath. WHAT DOES THIS PAPER ADD TO EXISTING KNOWLEDGE?: The study examined the rates of SPD, the risk of SPD and its associated factors in a national sample of Middle Eastern immigrants in the United States from 2001 to 2015. The study found that serious psychological distress rate was high among Middle Eastern immigrants. Being a female and having obesity were associated with a higher risk of reporting serious psychological distress among this population. WHAT ARE THE IMPLICATIONS FOR PRACTICE?: These outcomes necessitate mental health nursing interventions that provide culturally sensitive mental health care to immigrants For example, developing community-based prevention programmes is required to address risk factors of psychological distress and to increase awareness about psychological distress among Middle Eastern immigrants. ABSTRACT: Introduction While Middle Eastern immigrants are a fast-growing population in the United States, there is very limited literature on their mental health. Most of the available studies were conducted on small convenient samples in local communities. Aims To examine rates of serious psychological distress (SPD) and its associated factors among Middle Eastern immigrants in the United States, compared with US-born, non-Hispanic Whites. Methods Data from the National Health Interview Survey (NHIS) from 2001 to 2015 were analysed. The survey included 1,246 Middle Eastern immigrants and 232,392 US-born, non-Hispanic Whites. SPD was measured by the Kessler-6 psychological distress scale. Survey analysis procedures, sampling weights and variance estimates were conducted. Descriptive statistics and regression analyses were employed to examine differences and factors associated with SPD. Results SPD rate was the highest among Middle Eastern immigrants (5.99%) between 2006 and 2010. Among Middle Eastern immigrants, being female and obese were significantly associated with a higher risk of SPD. Discussion Middle Eastern immigrants in the United States suffered high rates of SPD. Gender and obesity were factors associated with SPD risk. Implications These outcomes indicate the need for mental health nursing interventions that provide culturally sensitive mental health care to immigrants, such as developing community-based prevention programmes.
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Affiliation(s)
- Maha Alkaid Albqoor
- Department of Community Health Nursing, University of Jordan University of Jordan, Amman, Jordan
| | - Jyu-Lin Chen
- Department of Family Health Care Nursing, University of California San Francisco, San Francisco, CA, USA
| | - Sandra Weiss
- Department of Community Health Systems, University of California San Francisco, San Francisco, CA, USA
| | - Catherine Waters
- Department of Community Health Systems, University of California San Francisco, San Francisco, CA, USA
| | - Ji-Won Choi
- Institute for Health Aging, University of California San Francisco, San Francisco, CA, USA
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Kang TY, Choi JW, Seo KJ, Kim KM, Kwon JS. Physical, Chemical, Mechanical, and Biological Properties of Four Different Commercial Root-End Filling Materials: A Comparative Study. Materials (Basel) 2021; 14:ma14071693. [PMID: 33808262 PMCID: PMC8036496 DOI: 10.3390/ma14071693] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/03/2021] [Revised: 03/25/2021] [Accepted: 03/26/2021] [Indexed: 11/16/2022]
Abstract
Commercial mineral trioxide aggregate (MTA) materials such as Endocem MTA (EC), Dia-Root Bio MTA (DR), RetroMTA (RM), and ProRoot MTA (PR) are increasingly used as root-end filling materials. The aim of this study was to assess and compare the physicochemical and mechanical properties and cytotoxicity of these MTAs. The film thicknesses of EC and DR were considerably less than that of PR; however, RM’s film thickness was greater than that of PR. In addition, the setting times of EC, DR, and RM were shorter than that of PR (p < 0.05). The solubility was not significantly different among all groups. The three relatively new MTA groups (EC, DR, and RM) exhibited a significant difference in pH variation and calcium ion release relative to the PR group (p < 0.05). The radiopacity of the three new MTAs was considerably less than that of PR. The mechanical strength of RM was not significantly different from that of PR (p > 0.05); however, the EC and DR groups were not as strong as PR (p < 0.05). All MTA groups revealed cytocompatibility. In conclusion, the results of this study confirmed that EC, RM, DR, and PR exhibit clinically acceptable physicochemical and mechanical properties and cell cytotoxicity.
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Affiliation(s)
- Tae-Yun Kang
- Department and Research Institute of Dental Biomaterials and Bioengineering, Yonsei University College of Dentistry, Seoul 03722, Korea; (T.-Y.K.); (J.-W.C.); (K.-J.S.); (K.-M.K.)
| | - Ji-Won Choi
- Department and Research Institute of Dental Biomaterials and Bioengineering, Yonsei University College of Dentistry, Seoul 03722, Korea; (T.-Y.K.); (J.-W.C.); (K.-J.S.); (K.-M.K.)
- BK21 FOUR Project, Yonsei University College of Dentistry, Seoul 03722, Korea
| | - Kyoung-Jin Seo
- Department and Research Institute of Dental Biomaterials and Bioengineering, Yonsei University College of Dentistry, Seoul 03722, Korea; (T.-Y.K.); (J.-W.C.); (K.-J.S.); (K.-M.K.)
- BK21 FOUR Project, Yonsei University College of Dentistry, Seoul 03722, Korea
| | - Kwang-Mahn Kim
- Department and Research Institute of Dental Biomaterials and Bioengineering, Yonsei University College of Dentistry, Seoul 03722, Korea; (T.-Y.K.); (J.-W.C.); (K.-J.S.); (K.-M.K.)
- BK21 FOUR Project, Yonsei University College of Dentistry, Seoul 03722, Korea
| | - Jae-Sung Kwon
- Department and Research Institute of Dental Biomaterials and Bioengineering, Yonsei University College of Dentistry, Seoul 03722, Korea; (T.-Y.K.); (J.-W.C.); (K.-J.S.); (K.-M.K.)
- BK21 FOUR Project, Yonsei University College of Dentistry, Seoul 03722, Korea
- Correspondence: ; Tel.: +82-2-2228-3081
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Park SH, Lim HB, Hong HJ, Kim HS, Yoon DK, Lee HW, Kong HK, Jeon JI, Choi JW, Cho EM, Cho YS, Lee CM. Health risk assessment for multimedia exposure of formaldehyde emitted by chemical accident. Environ Sci Pollut Res Int 2021; 28:9712-9722. [PMID: 33151492 DOI: 10.1007/s11356-020-11403-w] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2020] [Accepted: 10/23/2020] [Indexed: 06/11/2023]
Abstract
This study was conducted to provide basic data for chemical accident response by assessing the health risks of residents living near a chemical accident site due to long-term exposure. The study considered the temporal concentration changes of the leaked chemical (i.e., its behavior in the environment and dilution) until its extinction. A virtual chemical accident was assumed, in which 40 t of formaldehyde was accidentally discharged for 1 h in Ulsan Metropolitan City, Korea. Formaldehyde concentrations over time in each environmental medium after the accident were calculated using a multimedia environmental dynamics model. Exposure subjects divided into four age groups were considered. Carcinogenic risks due to respiration and non-carcinogenic risks due to soil intake were assessed. For all the age groups, the excess cancer risk did not exceed 1.0 × 10-6, indicating that no harmful health impact was caused by inhalation exposure to formaldehyde. The hazard index exceeded 1 for all the age groups, confirming that harmful health impacts were caused by exposure to soil containing the formaldehyde. This study is the first to assess chronic health risks by reflecting long-term residual and temporal concentration changes of a pollutant released in a chemical accident in each environmental medium until its extinction. This work is also significant in that it reflects the exposure characteristics of the toxic chemical.
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Affiliation(s)
- Si-Hyun Park
- Department of Nano & Biological Engineering, SeoKyeong University, Seoul, 02713, Korea
| | - Hui-Been Lim
- Department of Nano & Biological Engineering, SeoKyeong University, Seoul, 02713, Korea
| | - Hyong-Jin Hong
- Department of Nano & Biological Engineering, SeoKyeong University, Seoul, 02713, Korea
| | - Hee-Seok Kim
- Environmental Planning Institute, Graduate School of Environmental Studies, Seoul National University, Seoul, Korea
| | - Dan-Ki Yoon
- Department of Nano & Biological Engineering, SeoKyeong University, Seoul, 02713, Korea
| | - Hye-Won Lee
- Department of Nano & Biological Engineering, SeoKyeong University, Seoul, 02713, Korea
| | - Hye-Kwan Kong
- Department of Nano & Biological Engineering, SeoKyeong University, Seoul, 02713, Korea
| | - Jeong-In Jeon
- Department of Nano & Biological Engineering, SeoKyeong University, Seoul, 02713, Korea
| | - Ji-Won Choi
- Department of Chemical & Biological Engineering, SeoKyeong University, Seoul, Korea
| | - Eun-Min Cho
- Department of Nano & Biological Engineering, SeoKyeong University, Seoul, 02713, Korea
| | - Yong-Sung Cho
- Accident Coordination and Training Division, National Institute of Chemical Safety, Daejeon, Korea
| | - Cheol-Min Lee
- Department of Nano & Biological Engineering, SeoKyeong University, Seoul, 02713, Korea.
- Environmental Planning Institute, Graduate School of Environmental Studies, Seoul National University, Seoul, Korea.
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Kim DU, Kim DG, Choi JW, Shin JY, Kweon B, Zhou Z, Lee HS, Song HJ, Bae GS, Park SJ. Loganin Attenuates the Severity of Acute Kidney Injury Induced by Cisplatin through the Inhibition of ERK Activation in Mice. Int J Mol Sci 2021; 22:ijms22031421. [PMID: 33572597 PMCID: PMC7866969 DOI: 10.3390/ijms22031421] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2021] [Revised: 01/27/2021] [Accepted: 01/28/2021] [Indexed: 01/02/2023] Open
Abstract
Cisplatin is the most widely used chemotherapeutic agent. However, it often causes nephrotoxicity, which results in acute kidney injury (AKI). Therefore, we urgently need a drug that can reduce the nephrotoxicity induced by cisplatin. Loganin is a major iridoid glycoside isolated from Corni fructus that has been used as an anti-inflammatory agent in various pathological models. However, the renal protective activity of loganin remains unclear. In this study, to examine the protective effect of loganin on cisplatin-induced AKI, male C57BL/6 mice were orally administered with loganin (1, 10, and 20 mg/kg) 1 h before intraperitoneal injection of cisplatin (10 mg/kg) and sacrificed at three days after the injection. The administration of loganin inhibited the elevation of blood urea nitrogen (BUN) and creatinine (CREA) in serum, which are used as biomarkers of AKI. Moreover, histological kidney injury, proximal tubule damages, and renal cell death, such as apoptosis and ferroptosis, were reduced by loganin treatment. Also, pro-inflammatory cytokines, such as interleukin (IL)-1β, IL-6, and tumor necrosis factor (TNF)-α, reduced by loganin treatment. Furthermore, loganin deactivated the extracellular signal-regulated kinases (ERK) 1 and 2 during AKI. Taken together, our results suggest that loganin may attenuate cisplatin-induced AKI through the inhibition of ERK1/2.
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Affiliation(s)
- Dong-Uk Kim
- Hanbang Cardio-Renal Syndrome Research Center, Wonkwang University, Iksan, Jeonbuk 54538, Korea; (D.-U.K.); (D.-G.K.); (J.-W.C.); (H.-S.L.)
| | - Dong-Gu Kim
- Hanbang Cardio-Renal Syndrome Research Center, Wonkwang University, Iksan, Jeonbuk 54538, Korea; (D.-U.K.); (D.-G.K.); (J.-W.C.); (H.-S.L.)
- Department of Herbology, School of Korean Medicine, Wonkwang University, Iksan, Jeonbuk 54538, Korea; (J.Y.S.); (B.K.); (Z.Z.); (H.-J.S.)
| | - Ji-Won Choi
- Hanbang Cardio-Renal Syndrome Research Center, Wonkwang University, Iksan, Jeonbuk 54538, Korea; (D.-U.K.); (D.-G.K.); (J.-W.C.); (H.-S.L.)
- Department of Herbology, School of Korean Medicine, Wonkwang University, Iksan, Jeonbuk 54538, Korea; (J.Y.S.); (B.K.); (Z.Z.); (H.-J.S.)
| | - Joon Yeon Shin
- Department of Herbology, School of Korean Medicine, Wonkwang University, Iksan, Jeonbuk 54538, Korea; (J.Y.S.); (B.K.); (Z.Z.); (H.-J.S.)
| | - Bitna Kweon
- Department of Herbology, School of Korean Medicine, Wonkwang University, Iksan, Jeonbuk 54538, Korea; (J.Y.S.); (B.K.); (Z.Z.); (H.-J.S.)
| | - Ziqi Zhou
- Department of Herbology, School of Korean Medicine, Wonkwang University, Iksan, Jeonbuk 54538, Korea; (J.Y.S.); (B.K.); (Z.Z.); (H.-J.S.)
| | - Ho-Sub Lee
- Hanbang Cardio-Renal Syndrome Research Center, Wonkwang University, Iksan, Jeonbuk 54538, Korea; (D.-U.K.); (D.-G.K.); (J.-W.C.); (H.-S.L.)
- Department of Herbal Resources, Professional Graduate School of Korean Medicine, Wonkwang University, Iksan, Jeonbuk 54538, Korea
| | - Ho-Joon Song
- Department of Herbology, School of Korean Medicine, Wonkwang University, Iksan, Jeonbuk 54538, Korea; (J.Y.S.); (B.K.); (Z.Z.); (H.-J.S.)
| | - Gi-Sang Bae
- Hanbang Cardio-Renal Syndrome Research Center, Wonkwang University, Iksan, Jeonbuk 54538, Korea; (D.-U.K.); (D.-G.K.); (J.-W.C.); (H.-S.L.)
- Department of Pharmacology, School of Korean Medicine, Wonkwang University, Iksan, Jeonbuk 54538, Korea
- Research Center of Traditional Korean Medicine, Wonkwang University, Iksan, Jeonbuk 54538, Korea
- Correspondence: (G.-S.B.); (S.-J.P.); Tel.: +82-63-850-6842 (G.-S.B.); +82-63-850-6450 (S.-J.P.)
| | - Sung-Joo Park
- Hanbang Cardio-Renal Syndrome Research Center, Wonkwang University, Iksan, Jeonbuk 54538, Korea; (D.-U.K.); (D.-G.K.); (J.-W.C.); (H.-S.L.)
- Department of Herbology, School of Korean Medicine, Wonkwang University, Iksan, Jeonbuk 54538, Korea; (J.Y.S.); (B.K.); (Z.Z.); (H.-J.S.)
- Correspondence: (G.-S.B.); (S.-J.P.); Tel.: +82-63-850-6842 (G.-S.B.); +82-63-850-6450 (S.-J.P.)
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Kim JC, Kim YC, Choi JW. Use of hydrochlorothiazide and risk of nonmelanoma skin cancer in Koreans: a retrospective cohort study using administrative healthcare data. Clin Exp Dermatol 2021; 46:680-686. [PMID: 33215728 DOI: 10.1111/ced.14520] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2020] [Revised: 11/11/2020] [Accepted: 11/17/2020] [Indexed: 01/01/2023]
Abstract
BACKGROUND The incidence of skin cancer is increasing because of the ageing population and ultraviolet exposure, and previous studies have revealed that long-term use of hydrochlorothiazide (HCTZ), an antihypertensive agent, has been associated with an increased risk of nonmelanoma skin cancer (NMSC). However, the association of NMSC and HCTZ within East Asian populations is unclear. AIM To investigate the risk of NMSC in Korean subjects using HCTZ. METHODS A retrospective cohort study was conducted using the administrative healthcare data. The study enrolled 62 243 patients exposed to HCTZ with a cumulative dose of ≥ 2500 mg and 62 243 unexposed subjects matched 1 : 1 with the patients for age, sex and income level. RESULTS There was a significant difference in the cumulative incidence of NMSC between the two groups (log-rank P < 0.01). Cox regression analysis was conducted after adjusting for potential confounders, and showed the risk for NMSC in the group exposed to HCTZ was significantly higher than that of the unexposed group (hazard ratio = 1.48; 95% CI 1.03-2.13). In the subgroup analysis, the oldest age group (≥ 70 years) showed increased cumulative incidence of NMSC with statistical significance compared with the unexposed control group (log-rank P < 0.01). CONCLUSIONS In this study, we revealed that the cumulative use of HCTZ (≥ 2500 mg) could increase the risk of NMSC in Koreans, especially the older age group. Thus, HCTZ could be a risk factor for NMSC in East Asian as well as white populations.
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Affiliation(s)
- J C Kim
- Department of Dermatology, Ajou University School of Medicine, Suwon, Korea
| | - Y C Kim
- Department of Dermatology, Ajou University School of Medicine, Suwon, Korea
| | - J W Choi
- Department of Dermatology, Ajou University School of Medicine, Suwon, Korea
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Abstract
Physical inactivity is prevalent among ethnic minority women including Korean American (KA) women. We explored the barriers to and facilitators of physical activity (PA) and strategies to promote continued engagement in a PA program with a component of an online community. We conducted a qualitative descriptive study of 37 KA middle-aged women who used to be physically inactive and participated in an exit interview following postintervention visit. Using a thematic analysis approach to analyze the data, we found the individual, interpersonal, and neighborhood/community-level barriers to and facilitators of PA; social influence and social support-related themes were evident. Participants expressed benefit and interest in lifestyle modification using social media. Such program that reduces the barriers and reinforces the facilitators may be able to help motivate KA women to increase their PA.
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Affiliation(s)
- JiWon Choi
- Institute for Health & Aging/Department of Social and Behavioral Sciences, School of Nursing, University of California, San Francisco, CA, USA
| | - Juhyun Cho
- Cellular Molecular Biology, San Francisco State University, San Francisco, CA, USA
| | - Nah-Mee Shin
- College of Nursing, Korea University, Seoul, South Korea
| | - Janice Tsoh
- Department of Psychiatry, School of Medicine, University of California, San Francisco, CA, USA
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Kwon HY, Yoon HG, Lee C, Chen G, Liu K, Schmid AK, Wu YZ, Choi JW, Won C. Magnetic Hamiltonian parameter estimation using deep learning techniques. Sci Adv 2020; 6:6/39/eabb0872. [PMID: 32978161 PMCID: PMC7518863 DOI: 10.1126/sciadv.abb0872] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2020] [Accepted: 08/10/2020] [Indexed: 05/16/2023]
Abstract
Understanding spin textures in magnetic systems is extremely important to the spintronics and it is vital to extrapolate the magnetic Hamiltonian parameters through the experimentally determined spin. It can provide a better complementary link between theories and experimental results. We demonstrate deep learning can quantify the magnetic Hamiltonian from magnetic domain images. To train the deep neural network, we generated domain configurations with Monte Carlo method. The errors from the estimations was analyzed with statistical methods and confirmed the network was successfully trained to relate the Hamiltonian parameters with magnetic structure characteristics. The network was applied to estimate experimentally observed domain images. The results are consistent with the reported results, which verifies the effectiveness of our methods. On the basis of our study, we anticipate that the deep learning techniques make a bridge to connect the experimental and theoretical approaches not only in magnetism but also throughout any scientific research.
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Affiliation(s)
- H Y Kwon
- Center for Spintronics, Korea Institute of Science and Technology, Seoul 02792, South Korea.
| | - H G Yoon
- Department of Physics, Kyung Hee University, Seoul 02447, South Korea
| | - C Lee
- Department of Physics, Kyung Hee University, Seoul 02447, South Korea
| | - G Chen
- Department of Physics, University of California, Davis, Davis, CA 95616, USA
| | - K Liu
- Department of Physics, University of California, Davis, Davis, CA 95616, USA
- Physics Department, Georgetown University, Washington, DC 20057, USA
| | - A K Schmid
- National Center for Electron Microscopy, Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Y Z Wu
- Department of Physics, State Key Laboratory of Surface Physics and Advanced Materials Laboratory, Fudan University, Shanghai 200433, China
| | - J W Choi
- Center for Spintronics, Korea Institute of Science and Technology, Seoul 02792, South Korea
| | - C Won
- Department of Physics, Kyung Hee University, Seoul 02447, South Korea.
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Yang M, Li Q, Chopdekar RV, Dhall R, Turner J, Carlström JD, Ophus C, Klewe C, Shafer P, N'Diaye AT, Choi JW, Chen G, Wu YZ, Hwang C, Wang F, Qiu ZQ. Creation of skyrmions in van der Waals ferromagnet Fe 3GeTe 2 on (Co/Pd) n superlattice. Sci Adv 2020; 6:6/36/eabb5157. [PMID: 32917619 PMCID: PMC7473669 DOI: 10.1126/sciadv.abb5157] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Accepted: 07/15/2020] [Indexed: 05/27/2023]
Abstract
Magnetic skyrmions are topological spin textures, which usually exist in noncentrosymmetric materials where the crystal inversion symmetry breaking generates the so-called Dzyaloshinskii-Moriya interaction. This requirement unfortunately excludes many important magnetic material classes, including the recently found two-dimensional van der Waals (vdW) magnetic materials, which offer unprecedented opportunities for spintronic technology. Using photoemission electron microscopy and Lorentz transmission electron microscopy, we investigated and stabilized Néel-type magnetic skyrmion in vdW ferromagnetic Fe3GeTe2 on top of (Co/Pd) n in which the Fe3GeTe2 has a centrosymmetric crystal structure. We demonstrate that the magnetic coupling between the Fe3GeTe2 and the (Co/Pd) n could create skyrmions in Fe3GeTe2 without the need of an external magnetic field. Our results open exciting opportunities in spintronic research and the engineering of topologically protected nanoscale features by expanding the group of skyrmion host materials to include these previously unknown vdW magnets.
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Affiliation(s)
- M Yang
- Department of Physics, University of California, Berkeley, CA 94720, USA
| | - Q Li
- Department of Physics, University of California, Berkeley, CA 94720, USA.
| | - R V Chopdekar
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - R Dhall
- Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - J Turner
- Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - J D Carlström
- Department of Physics, University of California, Berkeley, CA 94720, USA
| | - C Ophus
- Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - C Klewe
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - P Shafer
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - A T N'Diaye
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - J W Choi
- Center for Spintronics, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea
| | - G Chen
- Department of Physics, University of California, Davis, CA 95616, USA
| | - Y Z Wu
- Department of Physics and State Key Laboratory of Surface Physics, Fudan University, Shanghai 200433, China
| | - C Hwang
- Korea Research Institute of Standards and Science, Yuseong, Daejeon 305-340, Republic of Korea
| | - F Wang
- Department of Physics, University of California, Berkeley, CA 94720, USA
| | - Z Q Qiu
- Department of Physics, University of California, Berkeley, CA 94720, USA.
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Jang J, Parmar NS, Choi WK, Choi JW. Rapid Defrost Transparent Thin-Film Heater with Flexibility and Chemical Stability. ACS Appl Mater Interfaces 2020; 12:38406-38414. [PMID: 32698575 DOI: 10.1021/acsami.0c10852] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Zn-doped SnOx/Ag/Zn-doped SnOx(ZTO/Ag/ZTO) multilayer thin films fabricated on a polyethylene terephthalate (PET) substrate using an optimized N2-to-(Ar + O2) gas ratio are used for transparent thin-film heaters with high performance and chemical stability. The ZTO/Ag/ZTO-based multilayer thin film exhibits enhanced durability at high temperatures and humid environments by incorporating nitrogen. The bending test results-there was no significant change in the sheet resistance even after 10,000 bending cycles-highlight the mechanical flexibility of the ZTO/Ag/ZTO multilayer thin film. The ZTO/Ag/ZTO-based thin-film heater on PET, fabricated under optimized deposition gas conditions, exhibits a fast thermal response time of 30 s and a low driving voltage of 6 V to attain 100 °C. It also exhibits uniform heat distribution at saturated temperature and chemical stability after 100 heating-cooling cycles. Hence, the proposed ZTO/Ag/ZTO-based thin-film heater is applicable for use in front and rear window automobile and building applications.
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Affiliation(s)
- Joohee Jang
- Center for Electronic Materials, Korea Institute of Science and Technology (KIST), 5, Hwarang-ro 14 gil, Seongbuk-gu, Seoul 02792, Republic of Korea
- Division of Nano & Information Technology, KIST School, University of Science and Technology (UST), 217, Gajeong-ro, Yuseong-gu, Daejeon 34113, Republic of Korea
| | - Narendra S Parmar
- Center for Electronic Materials, Korea Institute of Science and Technology (KIST), 5, Hwarang-ro 14 gil, Seongbuk-gu, Seoul 02792, Republic of Korea
| | - Won-Kook Choi
- Center for Opto-Electronic Materials and Devices, Korea Institute of Science and Technology (KIST), 5, Hwarang-ro 14-gil, Seongbuk-gu, Seoul 02792, Republic of Korea
| | - Ji-Won Choi
- Center for Electronic Materials, Korea Institute of Science and Technology (KIST), 5, Hwarang-ro 14 gil, Seongbuk-gu, Seoul 02792, Republic of Korea
- Division of Nano & Information Technology, KIST School, University of Science and Technology (UST), 217, Gajeong-ro, Yuseong-gu, Daejeon 34113, Republic of Korea
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38
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Shin JY, Choi JW, Kim DG, Zhou ZQ, Shin YK, Seo JH, Song HJ, Choi BM, Bae GS, Park SJ. Protective effects of Coenzyme Q10 against acute pancreatitis. Int Immunopharmacol 2020; 88:106900. [PMID: 32829089 DOI: 10.1016/j.intimp.2020.106900] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2020] [Revised: 08/05/2020] [Accepted: 08/12/2020] [Indexed: 02/07/2023]
Abstract
Acute pancreatitis (AP) refers to inflammation in the pancreas, which may lead to death in severe cases. Coenzyme Q10 (Q10), generally known to generate energy, plays an important role as an anti-oxidant and anti-inflammatory effector. Here, we showed the effect of Q10 on inflammatory response in murine AP model. For this study, we induced AP by injection of cerulein intraperitoneally or pancreatic duct ligation (PDL) in mice. The level of cytokines and digestive enzymes were measured in pancreas, and blood. All pancreatic tissues were excised for investigation such as histological changes, infiltration of immune cells. Administration of Q10 attenuated the severity of AP and its associated pulmonary complication as shown by reduction of acinar cell death, parenchymal edema, inflammatory cell infiltration and alveolar thickening in both cerulein-induced AP and PDL-induced AP. Moreover, reduction of the cytokines such as interleukin (IL)-1β, IL-6 and tumor necrosis factor (TNF)-α were observed in pancreas and pancreatic acinar cells by Q10. Furthermore, Q10 reduced the infiltration of immune cells such as monocytes and neutrophils and augmentation of chemokines such as CC chemokine-2 (CCL2) and C-X-C chemokine-2 (CXCL2) in pancreas of AP mice. In addition, Q10 deactivates the phosphorylation of extracellular signal-regulated kinase (ERK) and c-jun NH2-terminal kinase (JNK) in pancreas. In conclusion, these observations suggest that Q10 could attenuate the pancreatic damage and its associated pulmonary complications via inhibition of inflammatory cytokines and inflammatory cell infiltration and that the deactivation of ERK and JNK by Q10 might contribute to the attenuation of AP.
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Affiliation(s)
- Joon Yeon Shin
- Department of Herbology, School of Korean Medicine, Wonkwang University, Iksan-daero 460, Iksan, Jeollabuk-do 54538, Republic of Korea
| | - Ji-Won Choi
- Department of Herbology, School of Korean Medicine, Wonkwang University, Iksan-daero 460, Iksan, Jeollabuk-do 54538, Republic of Korea; Hanbang Cardio-Renal Syndrome Research Center, Wonkwang University, Iksan-daero 460, Iksan, Jeollabuk-do 54538, Republic of Korea
| | - Dong-Gu Kim
- Hanbang Cardio-Renal Syndrome Research Center, Wonkwang University, Iksan-daero 460, Iksan, Jeollabuk-do 54538, Republic of Korea
| | - Zi Qi Zhou
- Department of Herbology, School of Korean Medicine, Wonkwang University, Iksan-daero 460, Iksan, Jeollabuk-do 54538, Republic of Korea
| | - Yong Kook Shin
- Department of Bio Pharmaceutical Industry, Semyung University, Semyeong-ro 65, Jecheon, Chungcheongbuk-do 27136, Republic of Korea
| | - Jae Ho Seo
- Department of Biochemistry, School of Medicine, Wonkwang University, Iksan-daero 460, Iksan, Jeollabuk-do 54538, Republic of Korea
| | - Ho-Joon Song
- Department of Herbology, School of Korean Medicine, Wonkwang University, Iksan-daero 460, Iksan, Jeollabuk-do 54538, Republic of Korea
| | - Byung-Min Choi
- Department of Biochemistry, School of Medicine, Wonkwang University, Iksan-daero 460, Iksan, Jeollabuk-do 54538, Republic of Korea.
| | - Gi-Sang Bae
- Hanbang Cardio-Renal Syndrome Research Center, Wonkwang University, Iksan-daero 460, Iksan, Jeollabuk-do 54538, Republic of Korea; Department of Pharmacology, School of Korean Medicine, Wonkwang University, Iksan-daero 460, Iksan, Jeollabuk-do 54538, Republic of Korea; Research Center of Traditional Korean Medicine, Wonkwang University, Iksan-daero 460, Iksan, Jeollabuk-do 54538, Republic of Korea.
| | - Sung-Joo Park
- Department of Herbology, School of Korean Medicine, Wonkwang University, Iksan-daero 460, Iksan, Jeollabuk-do 54538, Republic of Korea; Hanbang Cardio-Renal Syndrome Research Center, Wonkwang University, Iksan-daero 460, Iksan, Jeollabuk-do 54538, Republic of Korea.
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39
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Choi JW, Lee ES. Response to 'The incidence and survival of melanoma and nonmelanoma skin cancer in patients with vitiligo: a nationwide population-based matched cohort study in Korea'. Br J Dermatol 2020; 183:1149-1150. [PMID: 32762038 DOI: 10.1111/bjd.19464] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2020] [Accepted: 07/31/2020] [Indexed: 12/12/2022]
Affiliation(s)
- J W Choi
- Department of Dermatology, Ajou University School of Medicine, Suwon, Korea
| | - E-S Lee
- Department of Dermatology, Ajou University School of Medicine, Suwon, Korea
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40
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Cooper CE, Silkstone GGA, Simons M, Gretton S, Rajagopal BS, Allen-Baume V, Syrett N, Shaik T, Popa G, Sheng X, Bird M, Choi JW, Piano R, Ronda L, Bettati S, Paredi G, Mozzarelli A, Reeder BJ. Engineering hemoglobin to enable homogenous PEGylation without modifying protein functionality. Biomater Sci 2020; 8:3896-3906. [PMID: 32539053 DOI: 10.1039/c9bm01773a] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
In order to infuse hemoglobin into the vasculature as an oxygen therapeutic or blood substitute, it is necessary to increase the size of the molecule to enhance vascular retention. This aim can be achieved by PEGylation. However, using non-specific conjugation methods creates heterogenous mixtures and alters protein function. Site-specific PEGylation at the naturally reactive thiol on human hemoglobin (βCys93) alters hemoglobin oxygen binding affinity and increases its autooxidation rate. In order to avoid this issue, new reactive thiol residues were therefore engineered at sites distant to the heme group and the α/β dimer/dimer interface. The two mutants were βCys93Ala/αAla19Cys and βCys93Ala/βAla13Cys. Gel electrophoresis, size exclusion chromatography and mass spectrometry revealed efficient PEGylation at both αAla19Cys and βAla13Cys, with over 80% of the thiols PEGylated in the case of αAla19Cys. For both mutants there was no significant effect on the oxygen affinity or the cooperativity of oxygen binding. PEGylation at αAla19Cys had the additional benefit of decreasing the rates of autoxidation and heme release, properties that have been considered contributory factors to the adverse clinical side effects exhibited by previous hemoglobin based oxygen carriers. PEGylation at αAla19Cys may therefore be a useful component of future clinical products.
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Affiliation(s)
- Chris E Cooper
- School of Life Sciences, University of Essex, Wivenhoe Park, Colchester, Essex CO4 3SQ, UK.
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Yang SY, Choi JW, Kim KM, Kwon JS. Prevention of Secondary Caries Using Resin-Based Pit and Fissure Sealants Containing Hydrated Calcium Silicate. Polymers (Basel) 2020; 12:polym12051200. [PMID: 32466181 PMCID: PMC7284760 DOI: 10.3390/polym12051200] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Revised: 05/17/2020] [Accepted: 05/23/2020] [Indexed: 11/16/2022] Open
Abstract
The objective of this study was to investigate the effects of hydrated calcium silicate filler (hCS) on resin-based pit and fissure sealants' acid neutralization, calcium ion release, and mechanical and physical properties. To produce the hCS filler, Portland cement (CS) was mixed with distilled water and ground into fine particles. The particles were then mixed with silanized glass filler and added to a photo-activated resin matrix. To evaluate the acid neutralization and calcium ion release properties, the specimens were immersed in a pH 4.0 lactic acid solution and distilled water for 28 days. Also, the flexural strength, depth of cure, water sorption, and solubility were tested. All of the groups containing hCS and CS required less than one minute to increase the pH from 4.0 to 5.5. With 50% hCS, the calcium ion release was higher than 50% CS in the distilled water at the initial time. The flexural strength and depth of cure decreased according to the increasing proportion of hCS added. The water sorption and solubility had an increasing trend as increasing proportions of hCS were added. These findings showed that pit and fissure sealant containing hCS exhibit superior acid neutralization and calcium release properties, and may be promising for caries-inhibiting dental material.
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Affiliation(s)
- Song-Yi Yang
- Department and Research Institute of Dental Biomaterials and Bioengineering, Yonsei University College of Dentistry, Seoul 03722, Korea; (S.-Y.Y.); (J.-W.C.); (K.-M.K.)
| | - Ji-Won Choi
- Department and Research Institute of Dental Biomaterials and Bioengineering, Yonsei University College of Dentistry, Seoul 03722, Korea; (S.-Y.Y.); (J.-W.C.); (K.-M.K.)
- BK21 PLUS Project, Yonsei University College of Dentistry, Seoul 03722, Korea
| | - Kwang-Mahn Kim
- Department and Research Institute of Dental Biomaterials and Bioengineering, Yonsei University College of Dentistry, Seoul 03722, Korea; (S.-Y.Y.); (J.-W.C.); (K.-M.K.)
- BK21 PLUS Project, Yonsei University College of Dentistry, Seoul 03722, Korea
| | - Jae-Sung Kwon
- Department and Research Institute of Dental Biomaterials and Bioengineering, Yonsei University College of Dentistry, Seoul 03722, Korea; (S.-Y.Y.); (J.-W.C.); (K.-M.K.)
- BK21 PLUS Project, Yonsei University College of Dentistry, Seoul 03722, Korea
- Correspondence: ; Tel.: +82-2-2228-3081; Fax: +82-2-364-9961
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Choi JW, Jeong JH, Jo IJ, Kim DG, Shin JY, Kim MJ, Choi BM, Shin YK, Song HJ, Bae GS, Park SJ. Preventive Effects of Gardenia jasminoides on Cerulein-Induced Chronic Pancreatitis. Am J Chin Med 2020; 48:987-1003. [PMID: 32431181 DOI: 10.1142/s0192415x20500470] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Our previous report revealed that Gardenia jasminoides (GJ) has protective effects against acute pancreatitis. So, we examined whether aqueous extract of GJ has anti-inflammation and antifibrotic effects even against cerulein-induced chronic pancreatitis (CP). CP was induced in mice by an intraperitoneal injection of a stable cholecystokinin (CCK) analogue, cerulein, six times a day, four days per week for three weeks. GJ extract (0.1 or 1[Formula: see text]g/kg) or saline (control group) were intraperitoneally injected 1[Formula: see text]h before first cerulein injection. After three weeks of stimulation, the pancreas was harvested for the examination of several fibrotic parameters. In addition, pancreatic stellate cells (PSCs) were isolated using gradient methods to examine the antifibrogenic effects of GJ. In the cerulein-induced CP mice, the histological features of the pancreas showed severe tissue damage such as enlarged interstitial spaces, inflammatory cell infiltrate and glandular atrophy, and tissue fibrosis. However, treatment of GJ reduced the severity of CP such as pancreatic edema and inflammatory cell infiltration. Furthermore, treatment of GJ increased pancreatic acinar cell survival, and reduced pancreatic fibrosis and activation of PSC in vivo and in vitro. In addition, GJ treatment inhibited the activation of c-Jun N-terminal kinase (JNK) and extracellular signal-regulated protein kinase (ERK) in the PSCs. These results suggest that GJ attenuated the severity of CP and the pancreatic fibrosis by inhibiting JNK and ERK activation during CP.
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Affiliation(s)
- Ji-Won Choi
- Department of Herbology, Wonkwang University School of Korean Medicine, Iksan 54538, Republic of Korea.,Hanbang Cardio-Renal Syndrome Research Center, Wonkwang University, Iksan 54538, Republic of Korea
| | - Jun-Hyeok Jeong
- Department of Herbology, Wonkwang University School of Korean Medicine, Iksan 54538, Republic of Korea
| | - Il-Joo Jo
- Division of Beauty Sciences, Wonkwang University School of Natural Sciences, Iksan 54538, Republic of Korea
| | - Dong-Gu Kim
- Hanbang Cardio-Renal Syndrome Research Center, Wonkwang University, Iksan 54538, Republic of Korea
| | - Joon Yeon Shin
- Department of Herbology, Wonkwang University School of Korean Medicine, Iksan 54538, Republic of Korea
| | - Myoung-Jin Kim
- Department of Herbology, Wonkwang University School of Korean Medicine, Iksan 54538, Republic of Korea
| | - Byung-Min Choi
- Department of Biochemistry, Wonkwang University School of Medicine, Iksan 54538, Republic of Korea
| | - Yong Kook Shin
- Major in Integrated Oriental Medical Bioscience, College of Health Biotechnology, Semyung University, Jecheon 27136, Republic of Korea
| | - Ho-Joon Song
- Department of Herbology, Wonkwang University School of Korean Medicine, Iksan 54538, Republic of Korea
| | - Gi-Sang Bae
- Department of Pharmacology, Wonkwang University School of Korean Medicine, Iksan 54538, Republic of Korea.,Hanbang Cardio-Renal Syndrome Research Center, Wonkwang University, Iksan 54538, Republic of Korea
| | - Sung-Joo Park
- Department of Herbology, Wonkwang University School of Korean Medicine, Iksan 54538, Republic of Korea.,Hanbang Cardio-Renal Syndrome Research Center, Wonkwang University, Iksan 54538, Republic of Korea
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Lee TG, Kim SW, Kim EJ, Jin Lee S, Hwang HG, Hong YW, Kim JS, Chae KH, Choi JW, Kang CY, Nahm S. Crystal structure and piezoelectric characteristics of various phases near the triple-point composition in PZ-PT-PNN system. Ann Ital Chir 2020. [DOI: 10.1016/j.jeurceramsoc.2019.12.063] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Zhang K, Lee TH, Choi MJ, Rajabi-Abhari A, Choi S, Choi KS, Varma RS, Choi JW, Jang HW, Shokouhimehr M. Electrochemical activity of Samarium on starch-derived porous carbon: rechargeable Li- and Al-ion batteries. Nano Converg 2020; 7:11. [PMID: 32189134 PMCID: PMC7080883 DOI: 10.1186/s40580-020-00221-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/13/2019] [Accepted: 03/03/2020] [Indexed: 06/10/2023]
Abstract
Rechargeable metal-ion batteries are considered promising electric storage systems to meet the emerging demand from electric vehicles, electronics, and electric grids. Thus far, secondary Li-ion batteries (LIBs) have seen great advances in terms of both their energy and their power density. However, safety issues remain a challenge. Therefore, rechargeable Al-ion batteries (AIBs) with a highly reliable safety advantage and active electrochemical performances have gathered intensive attention. However, the common issue for these two metal-ion batteries is the lack of cathode materials. Many advanced electrode materials reported provide greatly enhanced electrochemical properties. However, their inherent disadvantages-such as complicated fabrication procedures, restricted manufacturing parameters, and the requirement of expensive instruments-limits their potential for further applications. In this work, we demonstrate the high electrochemical activity of the lanthanide element, Sm, towards storing charges when used in both LIBs and AIBs. Lanthanide elements are often overlooked; however, they generally have attractive electrochemical properties owing to their unpaired electrons. We employed starch as both a low-cost carbon source and as a three-dimensional support for Sm metal nanoparticles. The composite product is fabricated using a one-pot wet-chemical method, followed by a simultaneous carbonization process. As a result, highly improved electrochemical properties are obtained when it is used as a cathode material for both LIBs and AIBs when compared to bare starch-derived C. Our results may introduce a new avenue toward the design of high-performance electrode materials for LIBs and AIBs.
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Affiliation(s)
- Kaiqiang Zhang
- Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University, Seoul, 08826 Republic of Korea
- Electronic Materials Center, Korea Institute of Science and Technology (KIST), Seoul, 136-791 Republic of Korea
| | - Tae Hyung Lee
- Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University, Seoul, 08826 Republic of Korea
| | - Min-Ju Choi
- Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University, Seoul, 08826 Republic of Korea
| | - Araz Rajabi-Abhari
- Program in Environmental Materials Science, Department of Forest Science, College of Agriculture and Life Sciences, Seoul National University, Seoul, Republic of Korea
| | - Seokhoon Choi
- Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University, Seoul, 08826 Republic of Korea
| | - Kyung Soon Choi
- Advanced Nano-Surface Research Group, Korea Basic Science Institute, Daejeon, 34133 Republic of Korea
| | - Rajender S. Varma
- Regional Center of Advanced Technologies and Materials, Department of Physical Chemistry, Faculty of Science, Palacky University, Š lechtitelů 27, 783 71 Olomouc, Czech Republic
| | - Ji-Won Choi
- Electronic Materials Center, Korea Institute of Science and Technology (KIST), Seoul, 136-791 Republic of Korea
| | - Ho Won Jang
- Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University, Seoul, 08826 Republic of Korea
| | - Mohammadreza Shokouhimehr
- Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University, Seoul, 08826 Republic of Korea
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Lee H, Lim KY, Kim KB, Yu JW, Choi WK, Choi JW. Hybrid Thin-Film Encapsulation for All-Solid-State Thin-Film Batteries. ACS Appl Mater Interfaces 2020; 12:11504-11510. [PMID: 32073256 DOI: 10.1021/acsami.9b20471] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
All-solid-state thin-film batteries have been actively investigated as a power source for various microdevices. However, insufficient research has been conducted on thin-film encapsulation, which is an essential element of these batteries as solid electrolytes and Li anodes are vulnerable to moisture in the atmosphere. In this study, a hybrid thin-film encapsulation structure of hybrid SiOy/SiNxOy/a-SiNx:H/Parylene is suggested and investigated. The water-vapor transmission rate of hybrid thin-film encapsulation is estimated to be 4.9 × 10-3 g m-2·day-1, a value that is applicable to batteries as well as flexible solar cells, thin-film transistor liquid-crystal display, and E-papers. As a result of hybrid thin-film encapsulation, it is confirmed that the all-solid-state thin-film batteries are stable even after 100 charge/discharge cycles in the air atmosphere for 30 days and present a Coulombic efficiency of 99.8% even after 100 cycles in the air atmosphere. These results demonstrate that the thin-film encapsulation structure of hybrid SiOy/SiNxOy/a-SiNx:H/Parylene can be employed in thin-film batteries while retaining long-term stability.
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Affiliation(s)
- HyunSeok Lee
- Center for Electronic Materials, Korea Institute of Science and Technology (KIST), 5, Hwarang-ro 14 gil, Seongbuk-gu, Seoul 02792, Korea
- Energy Conversion and Storage Materials Laboratory, Department of Material Science and Engineering, Yonsei University, 262 Seongsanno, Seodaemun-gu, Seoul 120-749, Korea
| | - Keun Yong Lim
- Center for Opto-Electronic Materials and Devices, Korea Institute of Science and Technology (KIST), 5, Hwarang-ro 14-gil, Seongbuk-gu, Seoul 02792, Korea
- Department of Advanced Materials Engineering for Information & Electronics, Kyung Hee University, Deogyeong-daro 1732, Giheung-gu, Yongin, Gyeonggi 17104, Korea
| | - Kwang-Bum Kim
- Energy Conversion and Storage Materials Laboratory, Department of Material Science and Engineering, Yonsei University, 262 Seongsanno, Seodaemun-gu, Seoul 120-749, Korea
| | - Jae-Woong Yu
- Department of Advanced Materials Engineering for Information & Electronics, Kyung Hee University, Deogyeong-daro 1732, Giheung-gu, Yongin, Gyeonggi 17104, Korea
| | - Won Kook Choi
- Center for Opto-Electronic Materials and Devices, Korea Institute of Science and Technology (KIST), 5, Hwarang-ro 14-gil, Seongbuk-gu, Seoul 02792, Korea
| | - Ji-Won Choi
- Center for Electronic Materials, Korea Institute of Science and Technology (KIST), 5, Hwarang-ro 14 gil, Seongbuk-gu, Seoul 02792, Korea
- Division of Nano & Information Technology, KIST School, Korea University of Science and Technology (KUST), 5, Hwarang-ro 14 gil, Seongbuk-gu, Seoul 02792, Korea
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46
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Zhang K, Lee TH, Khalilzadeh MA, Varma RS, Choi JW, Jang HW, Shokouhimehr M. Rendering Redox Reactions of Cathodes in Li-Ion Capacitors Enabled by Lanthanides. ACS Omega 2020; 5:1634-1639. [PMID: 32010838 PMCID: PMC6990622 DOI: 10.1021/acsomega.9b03699] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2019] [Accepted: 12/04/2019] [Indexed: 05/04/2023]
Abstract
Capacitors allow extremely fast charge and discharge operations, which is a challenge faced by recent metal-ion batteries despite having highly improved energy densities. Thus, combined type electric energy storage devices that can integrate high energy density and high power density with high potentials, can overcome the shortcomings of the current metal-ion batteries and capacitors. However, the limited capacities of cathode materials owing to the barren redox reactions are regarded as an obstacle for the development of future high-performance hybrid metal-ion capacitors. In this study, we demonstrate the redox-reaction-rendering effect of the much overlooked lanthanide elements when used as the cathode of lithium-ion capacitors using the mesoporous carbon (MC) as a matrix material. Consequently, these lanthanide elements can effectively enrich the redox reaction, thus improving the capacity of the matrix materials by more than two times. Typically, the Gd-elemental decoration of MC surprisingly enhances the capacity by almost two times as compared with the underacted MC. Furthermore, the La nanoparticles (NPs) decoration depicts the same behavior. Evident redox peaks were formed on the original rectangular cyclic voltammetry (CV) curves. This study provides the first example of embedding lanthanide elements on matrix materials to enrich the desired redox reactions for improving the electrochemical performances.
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Affiliation(s)
- Kaiqiang Zhang
- Department
of Materials Science and Engineering, Research Institute of Advanced
Materials, Seoul National University, Seoul 08826, Republic of Korea
- Electronic
Materials Center, Korea Institute of Science
and Technology (KIST), Seoul 136-791, Republic of Korea
| | - Tae Hyung Lee
- Department
of Materials Science and Engineering, Research Institute of Advanced
Materials, Seoul National University, Seoul 08826, Republic of Korea
| | - Mohammad A. Khalilzadeh
- Department
of Forest Biomaterials, College of Natural Resources, North Carolina State University, Raleigh, North Carolina 27607, United States
| | - Rajender S. Varma
- Regional
Center of Advanced Technologies and Materials, Department of Physical
Chemistry, Faculty of Science, Palacky University, Šlechtitelů 27, 783 71 Olomouc, Czech Republic
| | - Ji-Won Choi
- Electronic
Materials Center, Korea Institute of Science
and Technology (KIST), Seoul 136-791, Republic of Korea
| | - Ho Won Jang
- Department
of Materials Science and Engineering, Research Institute of Advanced
Materials, Seoul National University, Seoul 08826, Republic of Korea
| | - Mohammadreza Shokouhimehr
- Department
of Materials Science and Engineering, Research Institute of Advanced
Materials, Seoul National University, Seoul 08826, Republic of Korea
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Pyeon JJ, Baek IH, Lee WC, Lee H, Won SO, Lee GY, Chung TM, Han JH, Baek SH, Kim JS, Choi JW, Kang CY, Kim SK. Wafer-Scale, Conformal, and Low-Temperature Synthesis of Layered Tin Disulfides for Emerging Nonplanar and Flexible Electronics. ACS Appl Mater Interfaces 2020; 12:2679-2686. [PMID: 31849212 DOI: 10.1021/acsami.9b19471] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Two-dimensional (2D) metal dichalcogenides have drawn considerable interest because they offer possibilities for the implementation of emerging electronics. The emerging electronics are moving toward two major directions: vertical expansion of device space and flexibility. However, the development of a synthesis method for 2D metal dichalcogenides that meets all the requirements remains a significant challenge. Here, we propose a promising method for wafer-scale, conformal, and low-temperature (≤240 °C) synthesis of single-phase SnS2 via the atomic layer deposition technique. There is a trade-off relationship between the crystallinity and orientation preference of SnS2, which is efficiently eliminated by the two-step growth occurring at different temperatures. Consequently, the van der Waals layers of the highly crystalline SnS2 are parallel to the substrate. Thin-film transistors (TFTs) comprising the SnS2 layer show reasonable electrical performances (field-effect mobility: ∼0.8 cm2 V-1 s-1 and on/off ratio: ∼106), which are comparable to that of a single-crystal SnS2 flake. Moreover, we demonstrate nonplanar and flexible TFTs to identify the feasibility of the implementation of future electronics. Both the diagonal-structured TFT and flexible TFT fabricated without a transfer process show electrical performances comparable to those of rigid and planar TFTs. Particularly, the flexible TFT does not exhibit substantial degradation even after 2000 bending cycles. Our work would provide decisive opportunities for the implementation of future electronic devices utilizing 2D metal chalcogenides.
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Affiliation(s)
- Jung Joon Pyeon
- KU-KIST Graduate School of Converging Science and Technology , Korea University , Seoul 02841 , Korea
- Center for Electronic Materials , Korea Institute of Science and Technology , Seoul 02792 , Korea
| | - In-Hwan Baek
- Center for Electronic Materials , Korea Institute of Science and Technology , Seoul 02792 , Korea
- Department of Materials Science and Engineering , Seoul National University , Seoul 08826 , Korea
| | - Woo Chul Lee
- Center for Electronic Materials , Korea Institute of Science and Technology , Seoul 02792 , Korea
- Department of Materials Science and Engineering , Seoul National University , Seoul 08826 , Korea
| | - Hansol Lee
- Advanced Analysis Center , Korea Institute of Science and Technology , Seoul 02792 , Korea
| | - Sung Ok Won
- Advanced Analysis Center , Korea Institute of Science and Technology , Seoul 02792 , Korea
| | - Ga-Yeon Lee
- Division of Advanced Materials , Korea Research Institute of Chemical Technology , Daejeon 34114 , Korea
| | - Taek-Mo Chung
- Division of Advanced Materials , Korea Research Institute of Chemical Technology , Daejeon 34114 , Korea
| | - Jeong Hwan Han
- Department of Materials Science and Engineering , Seoul National University of Science and Technology , Seoul 01811 , Korea
| | - Seung-Hyub Baek
- Center for Electronic Materials , Korea Institute of Science and Technology , Seoul 02792 , Korea
- Department of Materials Science and Engineering , Yonsei University , Seoul 03722 , Korea
- Yonsei-KIST Convergence Research Institute , Seoul 02792 , Korea
| | - Jin-Sang Kim
- Center for Electronic Materials , Korea Institute of Science and Technology , Seoul 02792 , Korea
| | - Ji-Won Choi
- Center for Electronic Materials , Korea Institute of Science and Technology , Seoul 02792 , Korea
| | - Chong-Yun Kang
- KU-KIST Graduate School of Converging Science and Technology , Korea University , Seoul 02841 , Korea
- Center for Electronic Materials , Korea Institute of Science and Technology , Seoul 02792 , Korea
| | - Seong Keun Kim
- Center for Electronic Materials , Korea Institute of Science and Technology , Seoul 02792 , Korea
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48
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Zhang K, Lee TH, Cha JH, Varma RS, Choi JW, Jang HW, Shokouhimehr M. Cerium Hexacyanocobaltate: A Lanthanide-Compliant Prussian Blue Analogue for Li-Ion Storage. ACS Omega 2019; 4:21410-21416. [PMID: 31867535 PMCID: PMC6921632 DOI: 10.1021/acsomega.9b03104] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/21/2019] [Accepted: 11/15/2019] [Indexed: 06/10/2023]
Abstract
Electrode materials are the most significant components of lithium-ion batteries (LIBs) and play an important role in endowing them with high electrochemical performance. The exploration of new electrode materials and their comparative study with contemporary resources will help the design of advanced electrodes. Here, we have synthesized a new type of Prussian blue analogue (cerium(III) hexacyanocobaltate, CeHCCo) and systematically explored the effect of valence states of Fe2+ and Ce3+ on crystal structure and electrochemical properties of final products. We demonstrate that the unbalanced charge in iron(II) hexacyanocobaltate (FeHCCo), as opposed to that in CeHCCo, results in more residual K+ ions, thereby leading to the occupancy of cavities. As a result, the K+ ion-rich FeHCCo exhibits lower capacities of 55 ± 3 and 15 ± 3 mAh g-1 at 0.1 and 1 A g-1, respectively, compared with the K+ ion-deficient CeHCCo that exhibits capacities of 242 ± 3 and 111 ± 3 mAh g-1 at the same current densities. This work provides a novel contribution for the exploration of new Prussian blue analogues and bestows a newer concept for electrode material design.
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Affiliation(s)
- Kaiqiang Zhang
- Department
of Materials Science and Engineering, Research Institute of Advanced
Materials, Seoul National University, Seoul 08826, Republic of Korea
- Electronic
Materials Center, Korea Institute of Science
and Technology (KIST), Seoul 136-791, Republic of Korea
| | - Tae Hyung Lee
- Department
of Materials Science and Engineering, Research Institute of Advanced
Materials, Seoul National University, Seoul 08826, Republic of Korea
| | - Joo Hwan Cha
- Small
and Medium Enterprises Support Center, Korea
Institute of Science and Technology (KIST), Seoul 02792, Republic
of Korea
| | - Rajender S. Varma
- Regional
Centre of Advanced Technologies and Materials, Faculty of Science, Palacky University in Olomouc, Šlechtitelů 27, 783 71 Olomouc, Czech Republic
| | - Ji-Won Choi
- Electronic
Materials Center, Korea Institute of Science
and Technology (KIST), Seoul 136-791, Republic of Korea
| | - Ho Won Jang
- Department
of Materials Science and Engineering, Research Institute of Advanced
Materials, Seoul National University, Seoul 08826, Republic of Korea
| | - Mohammadreza Shokouhimehr
- Department
of Materials Science and Engineering, Research Institute of Advanced
Materials, Seoul National University, Seoul 08826, Republic of Korea
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49
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Gao N, Je SG, Im MY, Choi JW, Yang M, Li Q, Wang TY, Lee S, Han HS, Lee KS, Chao W, Hwang C, Li J, Qiu ZQ. Creation and annihilation of topological meron pairs in in-plane magnetized films. Nat Commun 2019; 10:5603. [PMID: 31811144 PMCID: PMC6898613 DOI: 10.1038/s41467-019-13642-z] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Accepted: 11/18/2019] [Indexed: 11/10/2022] Open
Abstract
Merons which are topologically equivalent to one-half of skyrmions can exist only in pairs or groups in two-dimensional (2D) ferromagnetic (FM) systems. The recent discovery of meron lattice in chiral magnet Co8Zn9Mn3 raises the immediate challenging question that whether a single meron pair, which is the most fundamental topological structure in any 2D meron systems, can be created and stabilized in a continuous FM film? Utilizing winding number conservation, we develop a new method to create and stabilize a single pair of merons in a continuous Py film by local vortex imprinting from a Co disk. By observing the created meron pair directly within a magnetic field, we determine its topological structure unambiguously and explore the topological effect in its creation and annihilation processes. Our work opens a pathway towards developing and controlling topological structures in general magnetic systems without the restriction of perpendicular anisotropy and Dzyaloshinskii–Moriya interaction. A meron is one half of a skyrmion but whether a single meron pair can be created and stabilized remains a challenging question. Here, Gao et al. develop a method to create and stabilize individual pairs of merons in a continuous Py film by local vortex imprinting from Co disks.
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Affiliation(s)
- N Gao
- Key Laboratory of Microelectronic Devices and Integrated Technology, Institute of Microelectronics of Chinese Academy of Sciences, Beijing, 100029, China.,Department of Physics, University of California at Berkeley, Berkeley, CA, 94720, USA
| | - S -G Je
- Center for X-ray Optics, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - M -Y Im
- Center for X-ray Optics, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA.,Department of Emerging Materials Science, DGIST, Daegu, Korea
| | - J W Choi
- Center for Spintronics, Korea Institute of Science and Technology, Seoul, 02792, Korea
| | - M Yang
- Department of Physics, University of California at Berkeley, Berkeley, CA, 94720, USA
| | - Q Li
- Department of Physics, University of California at Berkeley, Berkeley, CA, 94720, USA
| | - T Y Wang
- Department of Physics, University of California at Berkeley, Berkeley, CA, 94720, USA
| | - S Lee
- School of Materials Science and Engineering, Ulsan National Institute of Science and Technology, Ulsan, 44919, Korea
| | - H -S Han
- School of Materials Science and Engineering, Ulsan National Institute of Science and Technology, Ulsan, 44919, Korea
| | - K -S Lee
- School of Materials Science and Engineering, Ulsan National Institute of Science and Technology, Ulsan, 44919, Korea
| | - W Chao
- Center for X-ray Optics, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA
| | - C Hwang
- Korea Research Institute of Standards and Science, Yuseong, Daejeon, 305-340, Korea
| | - J Li
- International Center for Quantum Materials, School of Physics, Peking University, Beijing, 100871, China.
| | - Z Q Qiu
- Department of Physics, University of California at Berkeley, Berkeley, CA, 94720, USA.
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50
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Kim DG, Choi JW, Jo IJ, Kim MJ, Lee HS, Hong SH, Song HJ, Bae GS, Park SJ. Berberine ameliorates lipopolysaccharide‑induced inflammatory responses in mouse inner medullary collecting duct‑3 cells by downregulation of NF‑κB pathway. Mol Med Rep 2019; 21:258-266. [PMID: 31746359 PMCID: PMC6896374 DOI: 10.3892/mmr.2019.10823] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2019] [Accepted: 10/08/2019] [Indexed: 12/17/2022] Open
Abstract
The major role of inner medullary collecting duct (IMCD) cells is to maintain water and sodium homeostasis. In addition to the major role, it also participates in the protection of renal and systemic inflammation. Although IMCD cells could take part in renal and systemic inflammation, investigations on renal inflammation in IMCD cells have rarely been reported. Although berberine (BBR) has been reported to show diverse pharmacological effects, its anti-inflammatory and protective effects on IMCD cells have not been studied. Therefore, in the present study, we examined the anti-inflammatory and protective effects of BBR in mouse IMCD-3 (mIMCD-3) cells against lipopolysaccharide (LPS). An MTT assay was carried out to investigate the toxicity of BBR on mIMCD-3 cells. Reverse transcription quantitative-PCR and western blotting were performed to analysis pro-inflammatory molecules and cytokines. Mechanisms of BBR were examined by western blotting and immunocytochemistry. According to previous studies, pro-inflammatory molecules, such as inducible nitric oxide synthase and cyclooxygenase-2, and pro-inflammatory cytokines, such as interleukin (IL)-1β, IL-6 and tumor necrosis factor-α are increased in LPS-exposed mIMCD-3 cells. However, the production of these pro-inflammatory molecules is significantly inhibited by treatment with BBR. In addition, BBR inhibited translocation of nuclear factor (NF)-κB p65 from the cytosol to the nucleus, and degradation of inhibitory κ-Bα in LPS-exposed mIMCD-3 cells. In conclusion, BBR could inhibit renal inflammatory responses via inhibition of NF-κB signaling and ultimately contribute to amelioration of renal injury during systemic inflammation.
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Affiliation(s)
- Dong-Gu Kim
- Hanbang Cardio‑Renal Syndrome Research Center, Wonkwang University, Iksan, Jeonbuk 54538, Republic of Korea
| | - Ji-Won Choi
- Hanbang Cardio‑Renal Syndrome Research Center, Wonkwang University, Iksan, Jeonbuk 54538, Republic of Korea
| | - Il-Joo Jo
- Division of Beauty Sciences, School of Natural Sciences, Wonkwang University, Iksan, Jeonbuk 54538, Republic of Korea
| | - Myoung-Jin Kim
- Department of Herbology, School of Korean Medicine, Wonkwang University, Iksan, Jeonbuk 54538, Republic of Korea
| | - Ho-Sub Lee
- Hanbang Cardio‑Renal Syndrome Research Center, Wonkwang University, Iksan, Jeonbuk 54538, Republic of Korea
| | - Seung-Heon Hong
- Department of Oriental Pharmacy, College of Pharmacy, Wonkwang University, Iksan, Jeonbuk 54538, Republic of Korea
| | - Ho-Joon Song
- Department of Herbology, School of Korean Medicine, Wonkwang University, Iksan, Jeonbuk 54538, Republic of Korea
| | - Gi-Sang Bae
- Hanbang Cardio‑Renal Syndrome Research Center, Wonkwang University, Iksan, Jeonbuk 54538, Republic of Korea
| | - Sung-Joo Park
- Hanbang Cardio‑Renal Syndrome Research Center, Wonkwang University, Iksan, Jeonbuk 54538, Republic of Korea
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