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Kim JT, Kennedy S, Phiri I, Ryou SY. Plasma Surface Treatment of Cu Current Collectors for Improving the Electrochemical Performance of Si Anodes. ACS Appl Mater Interfaces 2024; 16:11400-11407. [PMID: 38409749 DOI: 10.1021/acsami.3c15971] [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: 02/28/2024]
Abstract
The practical utilization of Si electrodes is hindered by their substantial volume expansion during alloying and dealloying processes, which causes mechanical damage and separation from Cu current collectors. To alleviate the problem of Si composite detachment from Cu current collectors, the surface of the Cu current collectors is modified using atmospheric oxygen plasma. Plasma treatment improves the wetting ability of the Cu current collectors and, consequently, the coating quality of the Si electrodes. The uniform distribution of the Si electrode components reduces the sheet resistance and improves the adhesion properties of the Si electrodes containing surface-modified Cu current collectors. As a result, the volume expansion of Si during alloying and dealloying is reduced; this results in an excellent rate capability of 1584 mA h g-1 at a current density of 3.6 A g-1 (135% that of bare Cu) and excellent cycle performance of 1545 mA h g-1 after 300 cycles (Si electrodes with bare Cu exhibit 930 mA h g-1). Therefore, the developed plasma treatment method for Cu current collectors is expected to be an economical and efficient approach for improving the Li-ion battery performance.
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Affiliation(s)
- Jeong-Tae Kim
- Department of Chemical and Biological Engineering, Hanbat National University, 125 Dongseo-daero, Yuseong-gu, Daejeon 34158, Republic of Korea
| | - Ssendagire Kennedy
- Department of Chemical and Biological Engineering, Hanbat National University, 125 Dongseo-daero, Yuseong-gu, Daejeon 34158, Republic of Korea
| | - Isheunesu Phiri
- Department of Chemical and Biological Engineering, Hanbat National University, 125 Dongseo-daero, Yuseong-gu, Daejeon 34158, Republic of Korea
| | - Sun-Yul Ryou
- Department of Chemical and Biological Engineering, Hanbat National University, 125 Dongseo-daero, Yuseong-gu, Daejeon 34158, Republic of Korea
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Pham QQ, Ta QB, Kim JT. Capsule-Like Smart Aggregate with Pre-Determined Frequency Range for Impedance-Based Stress Monitoring. Sensors (Basel) 2022; 23:434. [PMID: 36617032 PMCID: PMC9824608 DOI: 10.3390/s23010434] [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: 11/23/2022] [Revised: 12/26/2022] [Accepted: 12/27/2022] [Indexed: 06/17/2023]
Abstract
In this article, a new capsule-like smart aggregate (CSA) is developed and verified for impedance-based stress monitoring in a pre-determined frequency range of less than 100 kHz. The pros and cons of the existing smart aggregate models are discussed to define the requirement for the improved CSA model. The conceptual design and the impedance measurement model of the capsule-like smart aggregate (CSA) are demonstrated for concrete damage monitoring. In the model, the interaction between the CSA and the monitored structure is considered as the 2-degrees of freedom (2-DOF) impedance system. The mechanical and impedance responses of the CSA are described for two conditions: during concrete strength development and under compressive loadings. Next, the prototype of the CSA is designed for impedance-based monitoring in concrete structures. The local dynamic properties of the CSA are numerically simulated to pre-determine the sensitive frequency bands of the impedance signals. Numerical and experimental impedance analyses are performed to investigate the sensitivity of the CSA under compressive loadings. The changes in the impedance signals of the CSA induced by the compressive loadings are analyzed to assess the effect of loading directions on the performance of the CSA. Correlations between statistical impedance features and compressive stresses are also made to examine the feasibility of the CSA for stress quantification.
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Pham QQ, Ta QB, Park JH, Kim JT. Raspberry Pi Platform Wireless Sensor Node for Low-Frequency Impedance Responses of PZT Interface. Sensors (Basel) 2022; 22:9592. [PMID: 36559959 PMCID: PMC9781527 DOI: 10.3390/s22249592] [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: 10/27/2022] [Revised: 12/04/2022] [Accepted: 12/05/2022] [Indexed: 06/17/2023]
Abstract
A wireless impedance monitoring system, called SSeL-Pi, is designed to have cheap, mobile, and handy practical features as compared to wired commercial impedance analyzers. A Raspberry Pi platform impedance sensor node is designed to measure signals at a low-frequency range of up to 100 kHz. The low-frequency impedance measurement via the proposed node has been combined with a new PZT interface technique for measuring local responses sensitive to structural damage. The new PZT interface can work as a surface-mounted or embedded sensor, and its local dynamic characteristics are numerically analyzed to pre-determine an effective impedance resonant frequency range of less than 100 kHz. Next, a software scheme was designed to visualize the input/output parameters of the proposed SSeL-Pi system (i.e., Raspberry Pi platform and PZT interface) and automate signal acquisition procedures of the impedance sensor node. The calibration for impedance signals obtained from the proposed system was performed by a series of procedures, from acquiring real and imaginary impedance to adjusting them with respect to a commercial impedance analyzer (HIOKI-3532). The feasibility of the wireless impedance monitoring system was experimentally evaluated for PZT interfaces that were subjected to various compressive loadings. The consistent results analyzed from signals measured by the SSeL-Pi and HIOKI 3532 systems were observed. Additionally, the strong relationships between impedance features (frequency shift and RMSD index) and compressive stresses of the PZT interfaces showed the potential for axial force/stress variation monitoring in real structures using the Raspberry Pi platform impedance sensor node and developed PZT interface.
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Affiliation(s)
- Quang-Quang Pham
- Department of Ocean Engineering, Pukyong National University, 45 Yongso-ro, Nam-gu, Busan 48513, Republic of Korea
| | - Quoc-Bao Ta
- Department of Ocean Engineering, Pukyong National University, 45 Yongso-ro, Nam-gu, Busan 48513, Republic of Korea
| | - Jae-Hyung Park
- CNS Solution Co., Ltd., 21 Century City Office, 312 Suyeong-ro, Nam-gu, Busan 48513, Republic of Korea
| | - Jeong-Tae Kim
- Department of Ocean Engineering, Pukyong National University, 45 Yongso-ro, Nam-gu, Busan 48513, Republic of Korea
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Phiri I, Kim J, Afumaa Afrifah V, Kim JT, Lee Y, Ryou SY. Dendrite Suppression by Lithium-Ion Redistribution and Lithium Wetting of Lithium Zeolite Li 2(Al 2Si 4O 12) in Liquid Electrolytes. ACS Appl Mater Interfaces 2022; 14:49689-49699. [PMID: 36261816 DOI: 10.1021/acsami.2c12512] [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: 06/16/2023]
Abstract
Lithium metal is considered a next-generation anode material for high-voltage, high-energy-density batteries; however, its commercialization is limited because of dendrite formation during charging, which leads to short-circuiting and fire. Li metal is coated with a lithium zeolite Li2(Al2Si4O12) (bikitaite - BKT) for dendrite suppression. The BKT-coated Li metal anode exhibits enhanced cycle performance for both Li/LMO (over 982 cycles) and Li/Li cells (over 2000 h at 0.52.0 mAh cm-2 and 693 h at 2.0 mAh cm-2). Moreover, the voltage profile of the Li/Li cells deviates from the conventional Li plating behavior. We hypothesize that this is due to the Li wetting of the BKT particles during plating, which leads to the formation of an interconnected three-dimensional (3D) Li network. Furthermore, BKT, a Li conductor, promotes even Li+-ion distribution during plating, resulting in the uniform deposition of Li and, consequently, suppressed dendrite formation. This work provides evidence that BKT can be potentially used in Li metal batteries.
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Affiliation(s)
- Isheunesu Phiri
- Department of Chemical and Biological Engineering, Hanbat National University, Daejeon 34158, Republic of Korea
| | - Jungmin Kim
- Department of Chemical and Biological Engineering, Hanbat National University, Daejeon 34158, Republic of Korea
| | - Vera Afumaa Afrifah
- Department of Chemical and Biological Engineering, Hanbat National University, Daejeon 34158, Republic of Korea
| | - Jeong-Tae Kim
- Department of Chemical and Biological Engineering, Hanbat National University, Daejeon 34158, Republic of Korea
| | - Yongmin Lee
- Department of Energy Science and Engineering, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu 42988, Republic of Korea
| | - Sun-Yul Ryou
- Department of Chemical and Biological Engineering, Hanbat National University, Daejeon 34158, Republic of Korea
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Ta QB, Huynh TC, Pham QQ, Kim JT. Corroded Bolt Identification Using Mask Region-Based Deep Learning Trained on Synthesized Data. Sensors (Basel) 2022; 22:3340. [PMID: 35591032 PMCID: PMC9104359 DOI: 10.3390/s22093340] [Citation(s) in RCA: 2] [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] [Subscribe] [Scholar Register] [Received: 03/24/2022] [Revised: 04/21/2022] [Accepted: 04/24/2022] [Indexed: 01/27/2023]
Abstract
The performance of a neural network depends on the availability of datasets, and most deep learning techniques lack accuracy and generalization when they are trained using limited datasets. Using synthesized training data is one of the effective ways to overcome the above limitation. Besides, the previous corroded bolt detection method has focused on classifying only two classes, clean and fully rusted bolts, and its performance for detecting partially rusted bolts is still questionable. This study presents a deep learning method to identify corroded bolts in steel structures using a mask region-based convolutional neural network (Mask-RCNN) trained on synthesized data. The Resnet50 integrated with a feature pyramid network is used as the backbone for feature extraction in the Mask-RCNN-based corroded bolt detector. A four-step data synthesis procedure is proposed to autonomously generate the training datasets of corroded bolts with different severities. Afterwards, the proposed detector is trained by the synthesized datasets, and its robustness is demonstrated by detecting corroded bolts in a lab-scale steel structure under varying capturing distances and perspectives. The results show that the proposed method has detected corroded bolts well and identified their corrosion levels with the most desired overall accuracy rate = 96.3% for a 1.0 m capturing distance and 97.5% for a 15° perspective angle.
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Affiliation(s)
- Quoc-Bao Ta
- Department of Ocean Engineering, Pukyong National University, Busan 48513, Korea; (Q.-B.T.); (Q.-Q.P.)
| | - Thanh-Canh Huynh
- Institute of Research and Development, Duy Tan University, Danang 550000, Vietnam;
- Faculty of Civil Engineering, Duy Tan University, Danang 550000, Vietnam
| | - Quang-Quang Pham
- Department of Ocean Engineering, Pukyong National University, Busan 48513, Korea; (Q.-B.T.); (Q.-Q.P.)
| | - Jeong-Tae Kim
- Department of Ocean Engineering, Pukyong National University, Busan 48513, Korea; (Q.-B.T.); (Q.-Q.P.)
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Pham QQ, Dang NL, Kim JT. Smart PZT-Embedded Sensors for Impedance Monitoring in Prestressed Concrete Anchorage. Sensors (Basel) 2021; 21:s21237918. [PMID: 34883921 PMCID: PMC8659839 DOI: 10.3390/s21237918] [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] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Revised: 11/24/2021] [Accepted: 11/25/2021] [Indexed: 11/16/2022]
Abstract
This study investigates the feasibility evaluation of smart PZT-embedded sensors for impedance-based damage monitoring in prestressed concrete (PSC) anchorages. Firstly, the concept of impedance-based damage monitoring for the concrete anchorage is concisely introduced. Secondly, a prototype design of PZT-embedded rebar and aggregate (so-called smart rebar-aggregate) is chosen to sensitively acquire impedance responses-induced local structural damage in anchorage members. Thirdly, an axially loaded concrete cylinder embedded with the smart rebar-aggregate is numerically and experimentally analyzed to investigate their performances of impedance monitoring. Additionally, empirical equations are formulated to represent the relationships between measured impedance signatures and applied compressive stresses. Lastly, an experimental test on a full-scale concrete anchorage embedded with smart rebar-aggregates at various locations is performed to evaluate the feasibility of the proposed method. For a sequence of loading cases, the variation in impedance responses is quantified to evaluate the accuracy of smart rebar-aggregate sensors. The empirical equations formulated based on the axially loaded concrete cylinder are implemented to predict compressive stresses at sensor locations in the PSC anchorage.
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Affiliation(s)
- Quang-Quang Pham
- Department of Ocean Engineering, Pukyong National University, Busan 48513, Korea; (Q.-Q.P.); (N.-L.D.)
| | - Ngoc-Loi Dang
- Department of Ocean Engineering, Pukyong National University, Busan 48513, Korea; (Q.-Q.P.); (N.-L.D.)
- Urban Infrastructure Faculty, Mien Tay Construction University, 20B Pho Co Dieu Street, Vinh Long 890000, Vietnam
| | - Jeong-Tae Kim
- Department of Ocean Engineering, Pukyong National University, Busan 48513, Korea; (Q.-Q.P.); (N.-L.D.)
- Correspondence: ; Tel.: +82-51-629-6585
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Ta QB, Kim JT. Monitoring of Corroded and Loosened Bolts in Steel Structures via Deep Learning and Hough Transforms. Sensors (Basel) 2020; 20:s20236888. [PMID: 33276512 PMCID: PMC7731320 DOI: 10.3390/s20236888] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [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: 11/09/2020] [Revised: 11/28/2020] [Accepted: 11/29/2020] [Indexed: 11/16/2022]
Abstract
In this study, a regional convolutional neural network (RCNN)-based deep learning and Hough line transform (HLT) algorithm are applied to monitor corroded and loosened bolts in steel structures. The monitoring goals are to detect rusted bolts distinguished from non-corroded ones and also to estimate bolt-loosening angles of the identified bolts. The following approaches are performed to achieve the goals. Firstly, a RCNN-based autonomous bolt detection scheme is designed to identify corroded and clean bolts in a captured image. Secondly, a HLT-based image processing algorithm is designed to estimate rotational angles (i.e., bolt-loosening) of cropped bolts. Finally, the accuracy of the proposed framework is experimentally evaluated under various capture distances, perspective distortions, and light intensities. The lab-scale monitoring results indicate that the suggested method accurately acquires rusted bolts for images captured under perspective distortion angles less than 15° and light intensities larger than 63 lux.
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Cho YS, Lee SE, Woo JT, Oh J, Choi HW, Kwon JH, Kim JT, Ha G, Jung S. Comparing recombinant MPB70/SahH and native 20-kDa protein for detecting bovine tuberculosis using ELISA. J Vet Med Sci 2020; 82:1631-1638. [PMID: 33055466 PMCID: PMC7719871 DOI: 10.1292/jvms.20-0422] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Bovine tuberculosis (bTB) is a zoonosis caused by Mycobacterium bovis. Test-and-cull protocols and gross pathological examinations of abattoir
animals as well as milk pasteurization have been implemented to prevent the spread of tuberculosis from animals to humans worldwide. Despite the importance of
precise and rapid diagnostic tests, conventional methods including intradermal skin tests and γ-interferon assays are limited by the high rate of false-negative
results for cattle in the late infectious stage and due to laborious and time-consuming procedures. Therefore, antibody detection methods such as enzyme-linked
immunosorbent assay (ELISA) are urgently needed to supplement the established approaches and expand the diagnostic window. This study was conducted to develop a
bTB ELISA by evaluating recombinant and native proteins and various assay parameters. We produced recombinant MPB70 and SahH (M70S) and a native 20-kDa protein
(20K) and optimized the ELISA protocol. The 20K ELISA showed 94.4% sensitivity and 98.2% specificity with an optimal sample-to-positive ratio cut-off of 0.531.
The sensitivity and specificity of M70S ELISA were 94.4% and 97.3%, respectively, with an optimal sample-to-negative ratio cut-off of 1.696. Both assays showed
acceptable diagnostic efficiency and could be used for bTB diagnosis in combination with established methods for herd screening and to expand the diagnostic
window.
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Affiliation(s)
- Yun Sang Cho
- Bacterial Disease Division, Department of Animal and Plant Health Research, Animal and Plant Quarantine Agency, Gimcheon 39660, Republic of Korea
| | - Sang Eun Lee
- Bacterial Disease Division, Department of Animal and Plant Health Research, Animal and Plant Quarantine Agency, Gimcheon 39660, Republic of Korea
| | - Jong-Tae Woo
- Gyeonggi Province Veterinary Service Center, Suwon 16381, Republic of Korea
| | - Jinsik Oh
- Bionote Co., Ltd., Hwaseong 18449, Republic of Korea
| | - Hwan Won Choi
- ChoongAng Vaccine Laboratory, Daejeon 34055, Republic of Korea
| | - Jin Hyeok Kwon
- Bacterial Disease Division, Department of Animal and Plant Health Research, Animal and Plant Quarantine Agency, Gimcheon 39660, Republic of Korea
| | - Jeong-Tae Kim
- Gyeonggi Province Veterinary Service Center, Suwon 16381, Republic of Korea
| | - Gunwoo Ha
- Bionote Co., Ltd., Hwaseong 18449, Republic of Korea
| | - Sukchan Jung
- Bacterial Disease Division, Department of Animal and Plant Health Research, Animal and Plant Quarantine Agency, Gimcheon 39660, Republic of Korea
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Yezhov PV, Kim JT. Phase-Only Rotation Invariant Correlation Using Synthesized Phase Objects. J Nanosci Nanotechnol 2019; 19:1213-1215. [PMID: 30360237 DOI: 10.1166/jnn.2019.15967] [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] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We present a development of the method of synthesized phase objects (SPO-method) (P. V. Yezhov, et al. Opt. Exp. 20, 29854 (2012)) for the phase-only rotation invariant pattern recognition. It has been performed a comparison of correlation signals for a set of amplitude objects under their rotation by using the standard and SPO methods, by applying the Fourier-Mellin transformation. The results of both calculation and optical experiments carried out using an optical-digital correlator with SLM in the Fourier plane have been presented.
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Affiliation(s)
- P V Yezhov
- Institute of Physics of the NAS of Ukraine, Kyiv 03028, Ukraine
| | - J T Kim
- Department of Photonic Engineering, College of Engineering, Chosun University, Gwangju 61452, Korea
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Kim JT, Shim JK, Kim SH, Ryu HG, Yoon SZ, Jeon YS, Bahk JH, Kim CS. Remifentanil vs. Lignocaine for Attenuating the Haemodynamic Response during Rapid Sequence Induction Using Propofol: Double-Blind Randomised Clinical Trial. Anaesth Intensive Care 2019; 35:20-3. [PMID: 17323661 DOI: 10.1177/0310057x0703500102] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
This study was conducted to determine whether lignocaine or remifentanil effectively attenuate the response to endotracheal intubation during rapid sequence induction. Forty-eight patients were randomly divided into three groups: Group NS (n=16) received normal saline 0.1 ml/kg, Group L (n=16) received lignocaine 1.5 mg/kg, and Group R (n=16) received remifentanil 1 /μg/kg. Anaesthesia was induced with propofol 2 mg/kg after glycopyrrolate 0.2 mg IV. Each study drug was given intravenously over 30 seconds after loss of consciousness. Cricoid pressure was applied until intubation. Succinylcholine 1.0 mg/kg was administered to facilitate tracheal intubation. After intubation, the patient's lungs were ventilated with sevoflurane 1% and nitrous oxide 50% in oxygen. Mean arterial pressure and heart rate were recorded before induction, at loss of consciousness, immediately before laryngoscopy and every minute after intubation for 10 minutes. Mean arterial pressure fell following propofol in all groups. The maximum increase in mean arterial pressure in Group NS and Group L were 46% and 38% respectively above the baseline value one minute after intubation, whereas the mean arterial pressure in Group R increased only back to the baseline value. Heart rate in Group NS and Group L were increased by 27% and 33% above baseline value respectively one minute after intubation, while that in Group R was increased only to the baseline value. The results indicate that remifentanil 1 μg/kg, but not lignocaine 1.5 mg/kg, effectively attenuates the haemodynamic response to endotracheal intubation during rapid sequence induction using propofol.
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Affiliation(s)
- J T Kim
- Department of Anesthesiology and Pain Medicine, Seoul National University Hospital and Yonsei University Hospital, Seoul, Korea
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Ryu JY, Huynh TC, Kim JT. Tension Force Estimation in Axially Loaded Members using Wearable Piezoelectric Interface Technique. Sensors (Basel) 2018; 19:s19010047. [PMID: 30583558 PMCID: PMC6339189 DOI: 10.3390/s19010047] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [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: 11/29/2018] [Revised: 12/13/2018] [Accepted: 12/20/2018] [Indexed: 11/23/2022]
Abstract
Force changes in axially loaded members can be monitored by quantifying variations in impedance signatures. However, statistical damage metrics, which are not physically related to the axial load, often lead to difficulties in accurately estimating the amount of axial force changes. Inspired by the wearable technology, this study proposes a novel wearable piezoelectric interface that can be used to monitor and quantitatively estimate the force changes in axial members. Firstly, an impedance-based force estimation method was developed for axially loaded members. The estimation was based on the relationship between the axial force level and the peak frequencies of impedance signatures, which were obtained from the wearable piezoelectric interface. The estimation of the load transfer capability from the axial member to the wearable interface was found to be an important factor for the accurate prediction of axial force. Secondly, a prototype of the wearable piezoelectric interface was designed to be easily fitted into existing axial members. Finally, the feasibility of the proposed technique was established by assessing tension force changes in a numerical model of an axially loaded cylindrical member and a lab-scale model of a prestressed cable structure.
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Affiliation(s)
- Joo-Young Ryu
- Department of Ocean Engineering, Pukyong National University, Busan 48723, Korea.
| | - Thanh-Canh Huynh
- Department of Ocean Engineering, Pukyong National University, Busan 48723, Korea.
| | - Jeong-Tae Kim
- Department of Ocean Engineering, Pukyong National University, Busan 48723, Korea.
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Huynh TC, Dang NL, Kim JT. Preload Monitoring in Bolted Connection Using Piezoelectric-Based Smart Interface. Sensors (Basel) 2018; 18:s18092766. [PMID: 30135407 PMCID: PMC6163815 DOI: 10.3390/s18092766] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [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: 08/02/2018] [Revised: 08/17/2018] [Accepted: 08/21/2018] [Indexed: 11/19/2022]
Abstract
In this study, a preload monitoring method using impedance signatures obtained from a piezoelectric-based smart interface is presented for bolted girder connections. Firstly, the background theory of the piezoelectric-based smart interface and its implementation into the health monitoring of bolted connections are outlined. A simplified electro-mechanical (EM) impedance model of a smart interface-embedded bolted connection system is formulated to interpret a mechanistic understanding of the EM impedance signatures under the effect of bolt preload. Secondly, finite element modeling of a bolted connection is carried out to show the numerical feasibility of the presented method, and to predetermine the sensitive frequency band of the impedance signatures. Finally, impedance measurements are conducted on a lab-scaled bolted girder connection, to verify the predetermined sensitive frequency range and to assess the bolt preload changes in the test structure.
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Affiliation(s)
- Thanh-Canh Huynh
- Department of Ocean Engineering, Pukyong National University, Busan 48723, Korea.
| | - Ngoc-Loi Dang
- Department of Ocean Engineering, Pukyong National University, Busan 48723, Korea.
| | - Jeong-Tae Kim
- Department of Ocean Engineering, Pukyong National University, Busan 48723, Korea.
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Lee YY, Yoon W, Kim SK, Baek BH, Kim GS, Kim JT, Park MS. Acute Basilar Artery Occlusion: Differences in Characteristics and Outcomes after Endovascular Therapy between Patients with and without Underlying Severe Atherosclerotic Stenosis. AJNR Am J Neuroradiol 2017; 38:1600-1604. [PMID: 28546252 DOI: 10.3174/ajnr.a5233] [Citation(s) in RCA: 71] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2017] [Accepted: 03/24/2017] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE Prediction of underlying intracranial atherosclerotic stenosis before endovascular therapy might be helpful for appropriate therapeutic planning in patients with acute ischemic stroke. This study aimed to compare the characteristics and treatment outcomes in patients with acute basilar artery occlusion relative to the existence or nonexistence of underlying intracranial atherosclerotic stenosis. MATERIALS AND METHODS Sixty-two patients with acute basilar artery occlusion underwent multimodal endovascular therapy. All patients underwent stent-retriever thrombectomy as a first-line endovascular therapy. Patients with underlying intracranial atherosclerotic stenosis underwent additional intracranial angioplasty and stent placement. The clinical and imaging characteristics and treatment outcomes were retrospectively analyzed and compared between patients with and without intracranial atherosclerotic stenosis. RESULTS Underlying intracranial atherosclerotic stenosis was identified at the occlusion site in 15 patients (24.1%). Occlusion in the proximal segment of the basilar artery was more common in patients with intracranial atherosclerotic stenosis (60% versus 6.4%, P < .001), whereas occlusion in the distal segment was more common in those without it (91.5% versus 26.7%, P < .001). Bilateral thalamic infarction on a pretreatment DWI was less common in patients with intracranial atherosclerotic stenosis (0% versus 27.7%, P = .027) compared with those without it. There were no significant differences in the rates of successful revascularization, favorable outcome, symptomatic hemorrhage, and mortality between the 2 groups. CONCLUSIONS Underlying intracranial atherosclerotic stenosis was not uncommon in patients with acute basilar artery occlusion. The occlusion segment of the basilar artery and the presence or absence of bilateral thalamic infarction on a pretreatment DWI might be helpful for predicting underlying intracranial atherosclerotic stenosis in patients with acute basilar artery occlusion. Patients with and without underlying intracranial atherosclerotic stenosis who underwent endovascular therapy had similar outcomes.
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Affiliation(s)
- Y Y Lee
- From the Departments of Radiology (Y.Y.L., W.Y., S.K.K., B.H.B., G.S.K.)
| | - W Yoon
- From the Departments of Radiology (Y.Y.L., W.Y., S.K.K., B.H.B., G.S.K.)
| | - S K Kim
- From the Departments of Radiology (Y.Y.L., W.Y., S.K.K., B.H.B., G.S.K.)
| | - B H Baek
- From the Departments of Radiology (Y.Y.L., W.Y., S.K.K., B.H.B., G.S.K.)
| | - G S Kim
- From the Departments of Radiology (Y.Y.L., W.Y., S.K.K., B.H.B., G.S.K.)
| | - J T Kim
- Neurology (J.T.K., M.S.P.), Chonnam National University Medical School, Chonnam National University Hospital, Gwangju, Republic of Korea
| | - M S Park
- Neurology (J.T.K., M.S.P.), Chonnam National University Medical School, Chonnam National University Hospital, Gwangju, Republic of Korea
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Kim JT, Hong SH, Park HJ, Kim YS, Suh JY, Lee JK, Park JM, Maity T, Eckert J, Kim KB. Deformation mechanisms to ameliorate the mechanical properties of novel TRIP/TWIP Co-Cr-Mo-(Cu) ultrafine eutectic alloys. Sci Rep 2017; 7:39959. [PMID: 28067248 PMCID: PMC5220307 DOI: 10.1038/srep39959] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [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: 11/01/2016] [Accepted: 11/28/2016] [Indexed: 11/09/2022] Open
Abstract
In the present study, the microstructural evolution and the modulation of the mechanical properties have been investigated for a Co-Cr-Mo (CCM) ternary eutectic alloy by addition of a small amount of copper (0.5 and 1 at.%). The microstructural observations reveal a distinct dissimilarity in the eutectic structure such as a broken lamellar structure and a well-aligned lamellar structure and an increasing volume fraction of Co lamellae as increasing amount of copper addition. This microstructural evolution leads to improved plasticity from 1% to 10% without the typical tradeoff between the overall strength and compressive plasticity. Moreover, investigation of the fractured samples indicates that the CCMCu alloy exhibits higher plastic deformability and combinatorial mechanisms for improved plastic behavior. The improved plasticity of CCMCu alloys originates from several deformation mechanisms; i) slip, ii) deformation twinning, iii) strain-induced transformation and iv) shear banding. These results reveal that the mechanical properties of eutectic alloys in the Co-Cr-Mo system can be ameliorated by micro-alloying such as Cu addition.
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Affiliation(s)
- J T Kim
- Hybrid Materials Center (HMC), Faculty of Nanotechnology and Advanced Materials Engineering, Sejong University, 209 Neugdong-ro, Gwangjin-gu, Seoul 143-747, Republic of Korea
| | - S H Hong
- Hybrid Materials Center (HMC), Faculty of Nanotechnology and Advanced Materials Engineering, Sejong University, 209 Neugdong-ro, Gwangjin-gu, Seoul 143-747, Republic of Korea
| | - H J Park
- Hybrid Materials Center (HMC), Faculty of Nanotechnology and Advanced Materials Engineering, Sejong University, 209 Neugdong-ro, Gwangjin-gu, Seoul 143-747, Republic of Korea
| | - Y S Kim
- Hybrid Materials Center (HMC), Faculty of Nanotechnology and Advanced Materials Engineering, Sejong University, 209 Neugdong-ro, Gwangjin-gu, Seoul 143-747, Republic of Korea
| | - J Y Suh
- High Temperature Energy Materials Research Center, Korea Institute of Science and Technology, Hwarangno 14-gil 5, Seoungbuk-gu, Seoul 136-791, Republic of Korea
| | - J K Lee
- Division of Advanced Materials Engineering, Kongju National University, Cheonan 330-717, Republic of Korea
| | - J M Park
- Global Technology Center, Samsung Electronics Co., Ltd, 129 Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 443-742, Republic of Korea
| | - T Maity
- Department Materials Physics, Montanuniversität Leoben, Jahnstraße 12, A-8700 Leoben, Austria
| | - J Eckert
- Department Materials Physics, Montanuniversität Leoben, Jahnstraße 12, A-8700 Leoben, Austria.,Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Jahnstraße 12, A-8700 Leoben, Austria
| | - K B Kim
- Hybrid Materials Center (HMC), Faculty of Nanotechnology and Advanced Materials Engineering, Sejong University, 209 Neugdong-ro, Gwangjin-gu, Seoul 143-747, Republic of Korea
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Kim YH, Hwang KT, Kim JT, Kim SW. What is the ideal interval between dressing changes during negative pressure wound therapy for open traumatic fractures? J Wound Care 2016; 24:536, 538-40, 542. [PMID: 26551646 DOI: 10.12968/jowc.2015.24.11.536] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [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: 12/13/2022]
Abstract
OBJECTIVE Negative pressure wound therapy (NPWT) is effective in infection control during treatment of severe open fractures. However frequent dressing changes during NPWT are costly and cause patient discomfort. If the interval between dressing changes could be extended, these problems would be reduced. In this article we compare the outcomes of open IIIB fractures with 3-day versus 7-day intervals between dressing changes. METHOD Patients who sustained Gustilo IIIB open fractures were included. All underwent conventional orthopaedic fixation with delayed latissimus dorsi flap coverage. Group 1 had 3-day intervals between dressing changes and group 2 had 7-day intervals. The final outcomes in the two groups were analysed. RESULTS There were 38 patients in group 1 and 34 patients in group 2. Although the period between admission and final operation was similar in the two groups, the mean number of NPWT changes was 4.54 in 3 day in group 1 and 1.95 in group 2 (p<0.001). This led to a difference in NPWT-related costs; $341.26 in group 1 and $237.49 in group 2 (p<0.001). There was no difference in the frequency of complications such as infection or non-union of fractures. CONCLUSION NPWT is useful treatment option for open fractures, to bridge between initial debridement and final microsurgical tissue transfer. Considering patient comfort, the costs related to the NPWT, and the final flap results, a 7-day interval between changes of the NPWT is acceptable.
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Affiliation(s)
- Y H Kim
- Department of Plastic and Reconstructive Surgery, College of Medicine, Hanyang University, Seoul, Korea
| | - K T Hwang
- Department of Orthopedic Surgery, College of Medicine, Hanyang University, Seoul, Korea
| | - J T Kim
- Department of Plastic and Reconstructive Surgery, College of Medicine, Hanyang University, Seoul, Korea
| | - S W Kim
- Department of Plastic and Reconstructive Surgery, College of Medicine, Seoul National University, Seoul National University Hospital, Seoul, Korea
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Khoroshun AN, Chernykh AV, Tsimbaluk AN, Kirichenko JA, Yezhov PV, Kuzmenko AV, Kim JT. Properties of an Axial Optical Vortex Generated with the Use of a Gaussian Beam and Two Ramps. J Nanosci Nanotechnol 2016; 16:2105-2107. [PMID: 27433739 DOI: 10.1166/jnn.2016.12029] [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] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The behavior of an axial optical vortex (OV), which is generated with the use of a Gaussian beam and two ramps implemented by a phase-only spatial light modulator (SLM), is studied as a function of the parameters of two ramps. The analytic solution of a wave equation is obtained in the Fresnel approximation for the diffraction of a Gaussian beam on the two-ramp structure. Nonlinear dependences of the ellipticity gamma of the intensity distribution in the OV core, as well as the angle (phi between the x-axis and the major ellipse axis of the vortex core, on the ramp phase gradient K, are analyzed. The values of given parameters obtained in optical and numerical experiments are in good agreement. It is shown that, as the gradients of the phases of two ramps vary in the limits of 3pi rad/cm, the ellipticity and the slope angle of the major axis ellipse are changed, respectively, by 0.3 and 56 degrees. This gives possibility to efficiently control the parameters of OVs.
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Lee HJ, Kim JT, Shin MH, Choi DY, Park YS, Hong JT. The ossification pattern in paediatric occipito-cervical spine: is it possible to estimate real age? Clin Radiol 2015; 70:835-43. [PMID: 25979852 DOI: 10.1016/j.crad.2015.04.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2014] [Revised: 03/03/2015] [Accepted: 04/10/2015] [Indexed: 11/30/2022]
Abstract
AIM To retrospectively analyse the synchondrosis from the occipital bone to the whole cervical spine and determine the feasibility and validity of age estimation using computed tomography (CT) images. MATERIAL AND METHODS A total of 231 cervical spine or neck CT images of young children (<7 years of age) were examined. Twelve ossification centres were assessed (occiput: n = 2; atlas: n = 2; axis, n = 6; whole sub-axial vertebra: n = 2), and the ossification process was graded as open (O, fully lucent), osseous bridging (B, partially ossified), and fusion (F, totally ossified). After the first analysis was completed, the resulting chronological chart was used to estimate the age of 10 new cases in order to confirm the usefulness of the chart. RESULTS Infancy was easily estimated using the sub-axial or C2 posterior ossification centres, while the posterior occipital regions provided good estimation of age between 1-2 years. The most difficult period for accurate age estimation was between 2-4 years. However, the C2 anterior (neurocentral ossification) and C1 posterior regions did yield information to help determine the age around 3 years. The anterior occipital region was useful for age estimation between 4-5 years, and the C1-anterior region was potentially useful to help decide among the other parameters. The test for age estimation (TAE) had a very high ICC score (0.973) among the three observers. CONCLUSION Segmentalised analysis can enhance the ability to estimate real age, at least by the year. The analysis of the occipital bone made a strong contribution to the usefulness of the chorological chart. An organised chronological chart can provide readily available information for age estimation, and the primary application of the above data (TAE) demonstrated the validity of this approach.
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Affiliation(s)
- H J Lee
- Department of Neurosurgery, Incheon St Mary's Hospital, The Catholic University of Korea, Republic of Korea
| | - J T Kim
- Department of Neurosurgery, Incheon St Mary's Hospital, The Catholic University of Korea, Republic of Korea.
| | - M H Shin
- Department of Neurosurgery, Incheon St Mary's Hospital, The Catholic University of Korea, Republic of Korea
| | - D Y Choi
- Department of Neurosurgery, Incheon St Mary's Hospital, The Catholic University of Korea, Republic of Korea
| | - Y S Park
- Department of Neurosurgery, Incheon St Mary's Hospital, The Catholic University of Korea, Republic of Korea
| | - J T Hong
- Department of Neurosurgery, St Vincent's Hospital, The Catholic University of Korea, Republic of Korea
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Jeong JH, Kim YR, Kim EJ, Moon SH, Park MH, Kim JT, Kim JH, Lee KS. Comparison of Surgical Outcomes according to Suturing Methods in Single Port Access Laparoscopic Myomectomy. J Menopausal Med 2015; 21:47-55. [PMID: 26046038 PMCID: PMC4452814 DOI: 10.6118/jmm.2015.21.1.47] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [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: 03/04/2015] [Revised: 03/26/2015] [Accepted: 03/31/2015] [Indexed: 11/11/2022] Open
Abstract
Objectives This study was performed to consider the clinical experience of surgical outcome of single port access (SPA) laparoscopic myomectomy according to suturing methods. Methods The authors operated with 2 suturing method in SPA laparoscopic myomectomy for 246 patients and compared the surgical outcomes. Results The some significant difference of surgical outcome according to two suturing methods was demonstrated. Operating time was 100.50 minutes (± 42.09 minutes) in interrupted suture method group than 121.04 minutes (± 61.56 minutes) in continuous interlocking suture method group (P = 0.021). Estimated blood loss was less 222.59 mL (± 144.94 mL) in interrupted suture group than 340.11 mL (± 380.62 mL) in continuous interlocking suture method group (P = 0.042). Conclusion This experience suggests that interrupted suture method was effective for operating time and estimated blood loss than continuous interlocking method in SPA laparoscopic myomectomy.
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Affiliation(s)
- Jae-Heok Jeong
- Department of Obstetrics & Gynecology, Hwa Myung Il Sin Christian Hospital, Busan, Korea
| | - Yu-Ri Kim
- Department of Obstetrics & Gynecology, Hwa Myung Il Sin Christian Hospital, Busan, Korea
| | - Eun-Jeong Kim
- Department of Obstetrics & Gynecology, Hwa Myung Il Sin Christian Hospital, Busan, Korea
| | - Soo-Hyeon Moon
- Department of Obstetrics & Gynecology, Hwa Myung Il Sin Christian Hospital, Busan, Korea
| | - Mi-Hwa Park
- Department of Obstetrics & Gynecology, Hwa Myung Il Sin Christian Hospital, Busan, Korea
| | - Jeong-Tae Kim
- Department of Obstetrics & Gynecology, Hwa Myung Il Sin Christian Hospital, Busan, Korea
| | - Jeong-Hye Kim
- Department of Obstetrics & Gynecology, Hwa Myung Il Sin Christian Hospital, Busan, Korea
| | - Kyu-Sup Lee
- Department of Obstetrics & Gynecology, Pusan National University School of Medicine, Busan, Korea
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Oh Y, Kim JT, Kim MK, Chang YJ, Eom K, Park JG, Lee KM, Choe KH, An JY. Eosinophilic pleuritis due to sparganum: a case report. Korean J Parasitol 2014; 52:541-3. [PMID: 25352705 PMCID: PMC4210739 DOI: 10.3347/kjp.2014.52.5.541] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [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: 03/12/2014] [Revised: 06/03/2014] [Accepted: 07/03/2014] [Indexed: 12/03/2022]
Abstract
Sparganosis is a rare parasitic disease caused by migrating plerocercoid tapeworm larva of the genus Spirometra. Infection in humans is mainly caused by the ingestion of raw or inadequately cooked flesh of infected frogs, snakes, and chickens. Here, we report a rare case of a 45-year-old man who was admitted to our hospital with left lower chest pain. The chest radiograph and computed tomography (CT) scan revealed localized pleural effusion in the left lower lobe; further, peripheral blood eosinophilia and eosinophilic pleural effusion were present. Percutaneous catheter drainage was performed, which revealed long worm-shaped material that was identified as a sparganum by DNA sequencing. The patient showed clinical improvement after drainage of the sparganum. This study demonstrates the importance of considering parasitic diseases in the differential diagnosis of eosinophilic pleural effusion.
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Affiliation(s)
- Youngmin Oh
- Department of Internal Medicine, College of Medicine, Chungbuk National University, Cheongju 361-711, Korea
| | - Jeong-Tae Kim
- Department of Internal Medicine, College of Medicine, Chungbuk National University, Cheongju 361-711, Korea
| | - Mi-Kyeong Kim
- Department of Internal Medicine, College of Medicine, Chungbuk National University, Cheongju 361-711, Korea
| | - You-Jin Chang
- Department of Internal Medicine, College of Medicine, Chungbuk National University, Cheongju 361-711, Korea
| | - Keeseon Eom
- Department of Parasitology, College of Medicine, Chungbuk National University, Cheongju 361-711, Korea. ; Medical Research Institute and Parasite Resource Bank, College of Medicine, Chungbuk National University, Cheongju 361-711, Korea
| | - Jung-Gi Park
- Department of Parasitology, College of Medicine, Chungbuk National University, Cheongju 361-711, Korea. ; Medical Research Institute and Parasite Resource Bank, College of Medicine, Chungbuk National University, Cheongju 361-711, Korea
| | - Ki-Man Lee
- Department of Internal Medicine, College of Medicine, Chungbuk National University, Cheongju 361-711, Korea
| | - Kang-Hyeon Choe
- Department of Internal Medicine, College of Medicine, Chungbuk National University, Cheongju 361-711, Korea
| | - Jin-Young An
- Department of Internal Medicine, College of Medicine, Chungbuk National University, Cheongju 361-711, Korea
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Chung HW, Yun CM, Kim JT, Kim SW, Oh J, Huh K. Retinal sensitivity assessed by microperimetry and corresponding retinal structure and thickness in resolved central serous chorioretinopathy. Eye (Lond) 2014; 28:1223-30. [PMID: 25081286 DOI: 10.1038/eye.2014.185] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2013] [Accepted: 06/26/2014] [Indexed: 01/08/2023] Open
Abstract
PURPOSE To investigate the relationship between retinal sensitivity (RS) assessed by microperimetry (MP) and retinal structural changes in patients with resolved central serous chorioretinopathy (CSC). METHODS Spectral domain optical coherence tomography (OCT) examination and MP tests were performed in patients with resolved CSC. Point-to-point correlation was performed between RS and corresponding retinal structural changes using Pearson's correlation analysis. In addition, in a 1-mm zone in the central fovea, a correlation was calculated between the mean RS and the mean central retinal thickness (CRT). RESULTS Eighty-four eyes were analyzed. The total number of MP test points was 1092 (84 eyes × 13 points). The mean RS and retinal point thickness (RPT) of all test points were 13.53±3.84 dB and 208.6±48.0 μm, respectively. The RS and RPT were significantly decreased in the test points with loss of the ellipsoid portion of the inner segments (EPIS) (P<0.0001). Within the 1-mm foveal center zone, there was a significant correlation between mean RS and mean CRT (r=0.432, P<0.0001) and between RS and the corresponding RPT (r=0.339, P<0.0001). CONCLUSION RS was dependent on the status of the EPIS in patients with resolved CSC. The correlation between mean RS and mean CRT was compatible with the point-to-point correlation between RS and the corresponding RPT.
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Affiliation(s)
- H W Chung
- Korea University College of Medicine, Seoul, Korea
| | - C M Yun
- Department of Ophthalmology, Korea University College of Medicine, Seoul, Korea
| | - J T Kim
- Department of Ophthalmology, Chung-Ang University College of Medicine, Seoul, Korea
| | - S-W Kim
- Department of Ophthalmology, Korea University College of Medicine, Seoul, Korea
| | - J Oh
- Department of Ophthalmology, Korea University College of Medicine, Seoul, Korea
| | - K Huh
- Department of Ophthalmology, Korea University College of Medicine, Seoul, Korea
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Baek JM, Yoon W, Kim SK, Jung MY, Park MS, Kim JT, Kang HK. Acute basilar artery occlusion: outcome of mechanical thrombectomy with Solitaire stent within 8 hours of stroke onset. AJNR Am J Neuroradiol 2013; 35:989-93. [PMID: 24335542 DOI: 10.3174/ajnr.a3813] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE Mechanical thrombectomy with a stent retriever applied shortly after symptom onset could increase good functional outcomes and improve survival in patients with acute basilar artery occlusion, but this has not yet been studied. This study evaluated the efficacy and safety of mechanical thrombectomy with a Solitaire stent within 8 hours of stroke onset in patients with acute basilar artery occlusion. MATERIALS AND METHODS We analyzed 25 consecutive patients with acute basilar artery occlusion who were treated with mechanical thrombectomy by use of the Solitaire stent within 8 hours of stroke symptom onset. Successful recanalization was defined as TICI grade 2b or 3. Good outcome was defined as mRS score of 0-2 at 3 months. Clinical and radiologic data in patients with good outcomes were compared with those with poor outcomes. RESULTS Successful recanalization was achieved in 96% (24/25) of patients, and 48% (12/25) of patients had good outcomes. Eighty-eight percent (22/25) of patients survived to 3 months. The median NIHSS score on admission was significantly lower in patients with good outcomes than in those with poor outcomes (9.5 versus 14, P = .005). Procedure-related complications occurred in 2 patients (8%). No symptomatic intracerebral hemorrhages occurred. CONCLUSIONS The current study suggests that mechanical thrombectomy by use of a Solitaire stent within 8 hours of stroke onset increases good outcomes and improves survival in patients with acute basilar artery occlusion.
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Affiliation(s)
- J M Baek
- From the Departments of Radiology (J.M.B., W.Y., S.K.K., M.Y.J., H.K.K.)
| | - W Yoon
- From the Departments of Radiology (J.M.B., W.Y., S.K.K., M.Y.J., H.K.K.)
| | - S K Kim
- From the Departments of Radiology (J.M.B., W.Y., S.K.K., M.Y.J., H.K.K.)
| | - M Y Jung
- From the Departments of Radiology (J.M.B., W.Y., S.K.K., M.Y.J., H.K.K.)
| | - M S Park
- Neurology (M.S.P., J.T.K.), Chonnam National University Medical School, Chonnam National University Hospital, Gwangju, Republic of Korea
| | - J T Kim
- Neurology (M.S.P., J.T.K.), Chonnam National University Medical School, Chonnam National University Hospital, Gwangju, Republic of Korea
| | - H K Kang
- From the Departments of Radiology (J.M.B., W.Y., S.K.K., M.Y.J., H.K.K.)
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Choi YJ, Cho BH, Park MH, Nam TS, Kim JT, Lee SH, Kim BC, Kim MK, Cho KH. Clinical analysis of orthostatic headache in Korean patients. J Headache Pain 2013. [PMCID: PMC3620198 DOI: 10.1186/1129-2377-14-s1-p153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Choi YJ, Cho BH, Park MH, Nam TS, Kim JT, Lee SH, Kim BC, Kim MK, Cho KH. Clinical analysis of orthostatic headache in Korean patients. J Headache Pain 2013. [DOI: 10.1186/1129-2377-1-s1-p153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Shim YK, Kim JT, Seong MH, Kim YJ, Shim TJ, Kim SM, Lee SY, Bae JW, Kim KS, Hwang KK, Kim DW, Cho MC. Serum thioredoxin 1 level has close relation with myocardial damage amount in acute myocardial infarction patients. J Korean Med Sci 2012; 27:1162-9. [PMID: 23091312 PMCID: PMC3468751 DOI: 10.3346/jkms.2012.27.10.1162] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/17/2012] [Accepted: 07/05/2012] [Indexed: 01/21/2023] Open
Abstract
Thioredoxin-1 (Trx-1) is one of important anti-oxidative molecules to overcome the oxidative stress. The aim of the present study is to investigate the clinical relationship between serum concentration of Trx-1 on the pre-percutaneous coronary intervention (prePCI) and myocardial damage amount in the patients with acute myocardial infarction with the culprit lesion in only the left anterior descending artery on coronary angiography (n = 100). Initial value of creatine kinase (CK) was 368.3 ± 531.4 U/L, and MB isoenzyme of CK (CK-MB) level was 22.92 ± 33.8 ng/mL, and cardiac specific troponin T (cTnT) level was 0.61 ± 1.6 ng/mL. Positive correlations were observed between prePCI Trx-1 level and initial CK (P = 0.005, r = 0.281), and cTnT (P < 0.001, r = 0.453), peak CK (P = 0.001, r = 0.316) in all patients, but the statistical relation was observed only in ST segment elevation myocardial infarction (STEMI) patients (P = 0.008, r = 0.329 for initial CK, P = 0.001, r = 0.498 for initial cTnT, P = 0.005, r = 0.349 for peak CK), not in Non-STEMI patients. Conclusively, we consider prePCI serum Trx-1 as a predictor for myocardial damage amount in patients with STEMI.
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Affiliation(s)
- Young Kwang Shim
- Regional Cardiovascular Disease Center, Division of Cardiology, Department of Internal Medicine, Chungbuk National University Hospital, Cheongju, Korea
| | - Jeong-Tae Kim
- Regional Cardiovascular Disease Center, Division of Cardiology, Department of Internal Medicine, Chungbuk National University Hospital, Cheongju, Korea
| | - Mun-Hyuk Seong
- Regional Cardiovascular Disease Center, Division of Cardiology, Department of Internal Medicine, Chungbuk National University Hospital, Cheongju, Korea
| | - Yeon-Jeong Kim
- Regional Cardiovascular Disease Center, Division of Cardiology, Department of Internal Medicine, Chungbuk National University Hospital, Cheongju, Korea
| | - Tae-Jin Shim
- Regional Cardiovascular Disease Center, Division of Cardiology, Department of Internal Medicine, Chungbuk National University Hospital, Cheongju, Korea
| | - Sang Min Kim
- Regional Cardiovascular Disease Center, Division of Cardiology, Department of Internal Medicine, Chungbuk National University Hospital, Cheongju, Korea
| | - Sang Yeub Lee
- Regional Cardiovascular Disease Center, Division of Cardiology, Department of Internal Medicine, Chungbuk National University Hospital, Cheongju, Korea
| | - Jang-Whan Bae
- Regional Cardiovascular Disease Center, Division of Cardiology, Department of Internal Medicine, Chungbuk National University Hospital, Cheongju, Korea
| | - Ki-Seok Kim
- Regional Cardiovascular Disease Center, Division of Cardiology, Department of Internal Medicine, Jeju National University Hospital, Jeju, Korea
| | - Kyung-Kuk Hwang
- Regional Cardiovascular Disease Center, Division of Cardiology, Department of Internal Medicine, Chungbuk National University Hospital, Cheongju, Korea
| | - Dong-Woon Kim
- Regional Cardiovascular Disease Center, Division of Cardiology, Department of Internal Medicine, Chungbuk National University Hospital, Cheongju, Korea
| | - Myeong-Chan Cho
- Regional Cardiovascular Disease Center, Division of Cardiology, Department of Internal Medicine, Chungbuk National University Hospital, Cheongju, Korea
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Abstract
Gene regulatory networks (GRNs) determine the dynamics of gene expression. Interest often focuses on the topological structure of a GRN while numerical parameters (e.g. decay rates) are unknown and less important. For larger GRNs, inference of structure from gene expression data is prohibitively difficult. Models are often proposed based on integrative interpretation of multiple sources of information. We have developed DoGeNetS (Discrimination of Gene Network Structures), a method to directly assess candidate models of GRN structure against a target gene expression data set. The transsys language serves to model GRN structures. Numeric parameters are optimised to approximate the target data. Multiple restarts of optimisation yield score sets that provide a basis to statistically discriminate candidate models according to their potential to explain the target data. We demonstrate discrimination power of the DoGeNetS method by relating structural divergence to divergence between gene expression data sets. Known models are used to generate target expression data, and a set of candidate models with a defined structural divergence to the true model is produced. Structural divergence and divergence of expression profiles after optimisation are strongly correlated. We further show that discrimination is possible at noise levels exceeding those typical of contemporary microarray data. DoGeNetS is capable of discriminating the best GRN structure from among a small number of candidates. p values indicate whether differences in divergence of expression are significant. Although this study uses single gene knockouts, the DoGeNetS method can be adapted to simulate a virtually unlimited range of experimental conditions. [Includes supplementary material].
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Hong DS, Ho DD, Kim JT. Temperature-Compensated Impedance Monitoring of Steel Girder Connections Using Wireless Sensor Node. ACTA ACUST UNITED AC 2012. [DOI: 10.1166/asl.2012.3788] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Chae HS, Jang GE, Kim NH, Son HR, Lee JH, Kim SH, Park GN, Jo HJ, Kim JT, Chang KS. Classification of Cryptococcus neoformans and yeast-like fungus isolates from pigeon droppings by colony phenotyping and ITS genotyping and their seasonal variations in Korea. Avian Dis 2012; 56:58-64. [PMID: 22545529 DOI: 10.1637/9703-030711-reg.1] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Cryptococcus neoformans (C neoformans) is a frequent cause of invasive fungal disease in immunocompromised human hosts. Ninety-eight samples of pigeon droppings were collected from the pigeon shelters in Seoul, and cultured on birdseed agar (BSA) and Sabouraud dextrose agar (SDA). One hundred yeast-like colonies were selected and identified via phenotype characteristics, such as colony morphology and biochemical characteristics. This was then followed with genotyping via sequencing of the internal transcribed spacer (ITS) region. The colonies were classified into four kinds of colony color types: brown type (BrT), beige type (BeT), pink type (PT), and white type (WT). Numbers of isolated BrT, BeT, PT, and WT colonies were 22 (22%), 30 (30%), 19 (19%), and 39 (39%), respectively. All BrT colonies were identified as C neoformans. BeT were identified as 19 isolates of Cryptococcus laurentii, 10 isolates of Malassezia furfur, and 1 isolate of Cryptococcus uniguttulatus. PT was divided into two colony color types: light-PT (l-PT) and deep-PT (d-PT). Eighteen of l-PT and one of d-PT were identified as Rhodotorula glutinis and Rhodotorula mucilaginosa, respectively. WT were identified as 34 isolates of Cryptococcus guilliermondii, 3 isolates of Cryptococcus zeylanoides, 1 isolate of Cryptococcus sake, and 1 isolate of Stephanoascus ciferrii. Most strains were classified identically with the use of either phenotype or genotyping techniques, but C uniguttulatus and C sake classified by phenotyping were Pseudozyma aphidis and Cryptococcus famata by genotyping. This rapid screening technique of pathogenic yeast-like fungi by only colony characteristics is also expected to be very useful for primary yeast screening. Additionally, we investigated the seasonal variations of C neoformans and other yeast-like fungi from 379 pigeon-dropping samples that were collected from February 2011 to March 2011. We isolated 685 yeast-like fungi from the samples. Almost all C neoformans and yeast-like fungi were isolated in the fall (298 strains, 43.5%) and spring (244 strains, 35.6%). A few yeast-like fungi were isolated in winter (98 strains, 14.3%) and summer (45 strains, 6%). These results would be used as an important indicator related to epidemiology and prevention of pathogenic yeast-like fungi infections transmitted through pigeon droppings.
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Affiliation(s)
- H S Chae
- Seoul Metropolitan Government Research Institute of Public Health & Environment, Yang-Jae dong, Seo-Cho Gu, Seoul 137-131, Republic of Korea
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Weon BM, Kim JT, Je JH, Yi JM, Wang S, Lee WK. Colloid coalescence with focused x rays. Phys Rev Lett 2011; 107:018301. [PMID: 21797577 DOI: 10.1103/physrevlett.107.018301] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2010] [Revised: 02/17/2011] [Indexed: 05/31/2023]
Abstract
We show direct evidence that focused x rays enable us to merge polymer colloidal particles at room temperature. This phenomenon is ascribed to the photochemical scission of colloids with x rays, reducing the molecular weight, glass transition temperature, surface tension, and viscosity of colloids. The observation of the neck bridge growth with time shows that the x-ray-induced colloid coalescence is analogous to viscoelastic coalescence. This finding suggests a feasible protocol of photonic nanofabrication by sintering or welding of polymers, without thermal damage, using x-ray photonics.
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Affiliation(s)
- B M Weon
- X-ray Imaging Center, Department of Materials Science and Engineering, Pohang University of Science and Technology, Korea.
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Kim JT, Ng SW, Kim YH. Application of various compositions of thoracodorsal perforator flap for craniofacial contour deformities. J Plast Reconstr Aesthet Surg 2011; 64:902-10. [DOI: 10.1016/j.bjps.2010.11.027] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2010] [Revised: 11/19/2010] [Accepted: 11/30/2010] [Indexed: 10/18/2022]
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Park S, Kim KS, Kim JT, Kang D, Sung K. Effects of humic acid on phytodegradation of petroleum hydrocarbons in soil simultaneously contaminated with heavy metals. J Environ Sci (China) 2011; 23:2034-2041. [PMID: 22432335 DOI: 10.1016/s1001-0742(10)60670-5] [Citation(s) in RCA: 6] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The use of humic acid (HA) to enhance the efficiency of phytodegradation of petroleum hydrocarbons in soil contaminated with diesel fuel was evaluated in this study. A sample of soil was artificially contaminated with commercially available diesel fuel to an initial total petroleum hydrocarbons (TPH) concentration of 2300 mg/kg and four heavy metals with concentrations of 400 mg/kg for Pb, 200 mg/kg for Cu, 12 mg/kg for Cd, and 160 mg/kg for Ni. Three plant species, Brassica campestris, Festuca arundinacea, and Helianthus annuus, were selected for the phytodegradation experiment. Percentage degradation of TPH in the soil in a control pot supplemented with HA increased to 45% from 30% without HA. The addition of HA resulted in an increases in the removal of TPH from the soil in pots planted with B. campestris, E arundinacea, and H. annuus, enhancing percentage degradation to 86%, 64%, and 85% from 45%, 54%, and 66%, respectively. The effect of HA was also observed in the degradation of n-alkanes within 30 days. The rates of removal of n-alkanes in soil planted with B. campestris and H. annuus were high for n-alkanes in the range of C11-C28. A dynamic increase in dehydrogenase activity was observed during the last 15 days of a 30-day experimental period in all the pots amended with HA. The enhanced biodegradation performance for TPHs observed might be due to an increase in microbial activities and bioavailable TPH in soils caused by combined effects of plants and HA. The results suggested that HA could act as an enhancing agent for phytodegradation of petroleum hydrocarbons in soil contaminated with diesel fuel and heavy metals.
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Affiliation(s)
- Soyoung Park
- Department of Ocean Engineering, Pukyong National University, Busan 608-737, Korea.
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Lee YS, Lee JH, Choi JS, Son CE, Jeon SW, Kim JT, Joo KJ, Cho YS, Jung US. Accessory polar renal artery encountered in transperitoneal systemic laparoscopic paraaortic lymphadenectomy. EUR J GYNAECOL ONCOL 2011; 32:87-90. [PMID: 21446334] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
OBJECTIVE To increase vigilance among gynecological surgeons for the presence of accessory polar renal artery (APRA) encountered with transperitoneal systemic laparoscopic paraaortic lymphadenectomy (LPAL). METHODS A retrospective review was conducted on 156 women who underwent LPAL for various gynecologic malignancies between November 2003 and December 2009. RESULTS The median age, parity, body mass index, and number of previous abdominal surgeries, respectively, of the women were 52 years (range, 23-82 years), two (range, 0-7), 24.1 kg/m2 (range, 17.4-35.0 kg/m2), and 0 (range, 0-3). During the study period, we found four women with APRA. There were three cases of right lower APRAs arising from the abdominal aorta, caudal to the inferior mesenteric artery (IMA), terminating at the parenchyma of the lower pole of the right kidney. In the other case, the APRA arose from the abdominal aorta superior to the IMA. There were no vascular complications, such as transection or ligation of the APRA. CONCLUSION It is important for the gynecological oncologic surgeon to have knowledge of retroperitoneal vascular anatomy, experience in laparoscopic surgery, and an accurate surgical technique to avoid vascular injury during LPAL.
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Affiliation(s)
- Y S Lee
- Department of Obstetrics and Gynecology, Flushing Hospital Medical Center, Flushing, NY, USA
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Kim YH, Kim JD, Visconti G, Kim JT. Life-threatening bleeding and radiologic intervention after aesthetic surgeries with minimal invasive approaches: report of two cases. J Plast Reconstr Aesthet Surg 2010; 63:e745-8. [PMID: 20643593 DOI: 10.1016/j.bjps.2010.06.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2010] [Revised: 05/28/2010] [Accepted: 06/04/2010] [Indexed: 11/26/2022]
Abstract
In this article, the authors report two cases of life-threatening bleeding after cosmetic surgeries that have been successfully treated with radiologic intervention. A 25-year-old female and a 35-year-old female presented at their institutions because of postoperative bleeding after intraoral mandibular angle ostectomy and endoscopic-guided trans-axillary breast augmentation, respectively. A ruptured traumatic pseudo-aneurysm of the right superficial temporal artery was diagnosed in the first case and a haematoma posterior to the right pectoralis major, due to active bleeding from a perforator of internal mammary artery, in the second case. Attempts were made to stop the haemorrhage using standard methods, but failed. Therefore, superselective microcatheter angioembolisation has been successfully performed in both the cases. At 22-month follow-up for the first case and at 12-month follow-up for the second case, the patients are asymptomatic and the cosmetic outcomes are being preserved. With radiologic intervention, the authors gained satisfactory results in the above-mentioned situations. Using this, with only local anaesthesia and the absence of incisions, a precise approach with immediate treatment to the haemorrhaging site is possible. This can be an excellent solution for arterial bleeding that is difficult to access anatomically after aesthetic surgeries, and in selected cases. Furthermore, this procedure is less disfiguring and preserves the aesthetic surgery outcomes.
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Affiliation(s)
- Youn-Hwan Kim
- Department of Plastic and Reconstructive Surgery, Hanyang University Hospital, 17 Haengdang-Dong, Seongdong-Gu, Seoul 133-792, South Korea
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Baek WK, Cho J, Kim Y, Yoon YH, Kim JT, Kim KH, Kim DH, Park KS. Submitral left ventricular aneurysm of ischemic origin: report of two surgical cases. Thorac Cardiovasc Surg 2010; 58:238-40. [PMID: 20514583 DOI: 10.1055/s-0029-1240747] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Submitral left ventricular aneurysm has been exclusively recognized in the young African population and its occurrence in other than black Africans is rarely reported. Here we describe two surgical cases of submitral left ventricular aneurysm in Asian elderly persons. Although the aneurysms were typically located beneath the posterior mitral valve leaflet, we could identify diseased coronary arteries as well, unlike the reports in the literature asserting that this type of aneurysm occurs in the absence of coronary disease. The possible racial difference with regard to the etiology is addressed.
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Affiliation(s)
- W K Baek
- Department of Thoracic & Cardiovascular Surgery, Inha University Hospital, Incheon, Republic of Korea.
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Kim JT, Na HS, Kim HS, Kim CS, Kim SD. CPAP of 10 cmH2O during cardiopulmonary bypass followed by an alveolar recruitment manoeuvre does not improve post-bypass oxygenation compared to a recruitment manoeuvre alone in children. Anaesth Intensive Care 2010; 38:291-4. [PMID: 20369762 DOI: 10.1177/0310057x1003800227] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
This randomised controlled study assessed whether continuous positive airway pressure (CPAP) of 10 cmH2O during cardiopulmonary bypass improves post-bypass oxygenation in children compared with no CPAP during bypass. We studied children with a ventricular septal defect. CPAP of 10 cmH2O was applied during bypass in the CPAP group (n=24), whereas the lungs were left deflated in the control group (n=20). In both groups, an alveolar recruitment maneuver was performed by applying positive pressure of 30 to 40 cmH2O for five seconds before weaning from bypass. Postoperative ventilation had the peak inflation pressure set to produce an expired tidal volume of 8 ml/kg with positive end expiratory pressure of 5 cmH2O. Arterial blood gas and haemodynamic measurements were performed at skin incision, five minutes after weaning from bypass, five minutes after chest closure and four hours after arrival in the intensive care unit. In four children CPAP was discontinued because it adversely affected the operating field. There was no difference in demographic characteristics, haemodynamic data, bypass time and operation time. No difference was observed between the groups with respect to pH, PaO2, P(A-a) DO2, PaCO2, and ETCO2 at each time. Variability in the data was greater than expected, leading to a decrease in the expected power of the study. CPAP at 10 cmH2O during bypass was not found to improve the post-bypass oxygenation as compared with leaving the lung deflated during bypass in children undergoing ventricular septal defect repair who had an alveolar recruitment maneuver at the end of bypass.
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Affiliation(s)
- J T Kim
- Department of Anesthesiology and Pain Medicine, Seoul National University Hospital, Seoul, Korea
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Shin TK, Kim HC, Kim JT, Ahn MJ, Moon CJ, Hyun JW, Jee YH, Lee NH, Park JW. A comparative study of radioprotection with Callophyllis japonica extract and amifostine against lethal whole body gamma irradiation in mice. ACTA ACUST UNITED AC 2010. [DOI: 10.3742/opem.2010.10.1.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Abstract
We present the gas sensing characteristics of the individual ZnO nanowires with single-crystalline and multiple grain boundaries (GBs) fabricated using bottom-up and top-down approaches, respectively. The sensor response of the individual ZnO nanowires with the multiple GBs was enhanced approximately three times as compared to that of single-crystalline ZnO nanowires due to well-known GB modulations. However, the response and recovery times of the individual ZnO nanowires with multiple GBs were much slower than those of the single-crystalline ZnO nanowire, indicating the presence of oxygen diffusion resistance to GBs due to the relatively fast surface kinetic reaction. Simplified kinetic diffusion modeling and experimental results could quantify the significant diffusion resistance of gas molecules into the GBs of the individual ZnO nanowires.
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Affiliation(s)
- H-W Ra
- School of Semiconductor and Chemical Engineering and Technology, Chonbuk National University, Jeonju 561-756, Korea
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Jo SY, Kang BR, Kim JT, Ra HW, Im YH. The synthesis of single PdAu bimetallic nanowire: feasibility study for hydrogen sensing. Nanotechnology 2010; 21:055604. [PMID: 20023307 DOI: 10.1088/0957-4484/21/5/055604] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Single PdAu bimetallic nanowires have been synthesized via the sequential processes of electrochemical deposition and dielectrophoresis (DEP). In the first step, Pd/Au grains on predefined Au electrodes were grown by electrochemical deposition and could assist effectively the formation of a single PdAu nanowire with a good directionality by the subsequent DEP process. The synthesized PdAu nanowires have an average of approximately 10 at.% of Pd, a good resistance of a few hundred Omega, diameters of 300 nm on average and lengths of up to 15 microm. Based on the single PdAu nanowire, hydrogen detection was demonstrated in the range from 100 to 2500 ppm.
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Affiliation(s)
- S Y Jo
- School of Semiconductor and Chemical Engineering and Technology, Chonbuk National University, Jeonju 561-756, Korea
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Jang HY, Ji SJ, Kim YH, Lee HY, Shin JS, Cheong HT, Kim JT, Park IC, Kong HS, Park CK, Yang BK. Antioxidative Effects of Astaxanthin against Nitric Oxide-Induced Oxidative Stress on Cell Viability and Gene Expression in Bovine Oviduct Epithelial Cell and the Developmental Competence of Bovine IVM/IVF Embryos. Reprod Domest Anim 2009; 45:967-74. [DOI: 10.1111/j.1439-0531.2009.01469.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Jang HY, Kim YH, Kim BW, Park IC, Cheong HT, Kim JT, Park CK, Kong HS, Lee HK, Yang BK. Ameliorative Effects of Melatonin against Hydrogen Peroxide-Induced Oxidative Stress on Boar Sperm Characteristics and SubsequentIn VitroEmbryo Development. Reprod Domest Anim 2009; 45:943-50. [DOI: 10.1111/j.1439-0531.2009.01466.x] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Na HS, Kim JT, Kim HS, Bahk JH, Kim CS, Kim SD. Practical anatomic landmarks for determining the insertion depth of central venous catheter in paediatric patients. Br J Anaesth 2009; 102:820-3. [PMID: 19380312 DOI: 10.1093/bja/aep078] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
BACKGROUND Various methods have been recommended to decide a proper insertion depth of central venous catheter (CVC). The carina is recommended as a useful target level for the CVC tip position. We evaluated the sternal head of a right clavicle and the nipples as anatomic landmarks for determining the optimal depth of CVC in paediatric patients. METHODS Ninety children, <5 yr, undergoing catheterization through the right internal jugular vein were enrolled. The insertion depth was determined as follows. The insertion point was designated as 'Point I'. The sternal head of the right clavicle was called 'Point A' and the midpoint of the perpendicular line drawn from Point A to the line connecting both nipples was called 'Point B'. The insertion depth of CVC was determined by adding the two distances (from I to A and from A to B) and subtracting 0.5 cm from this. A chest radiography was taken and the distance of the CVC tip from the carina level was measured by the Picture Archiving and Communicating System. RESULTS The mean distance of the CVC tip from the carina level was 0.1 (1.0) (P=0.293) cm above the carina (95% CI 0.1 cm below the carina-0.3 cm above the carina). There was no specific relationship between the distance of the CVC tip from the carina level and the patients' age, height, and weight. CONCLUSIONS The CVC tip could be placed near the carina by using the external landmarks without any formulae, images, and devices in children in our study.
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Affiliation(s)
- H S Na
- Department of Anesthesiology and Pain Medicine, Seoul National University Bundang Hospital, Seongnam, Gyeonggi, Republic of Korea
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Camargo A, Kim JT. Identification of markers of cardiovascular disease in women and the reconstruction of its corresponding protein interaction network. Annu Int Conf IEEE Eng Med Biol Soc 2009; 2009:6963-6968. [PMID: 19964718 DOI: 10.1109/iembs.2009.5333879] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Cardiovascular disease is the second most prevalent cause of morbidity and mortality in women of developed countries. Although it is well established that gender is a risk factor for cardiovascular disease, most gene expression analysis studies favour the identification of disease bio-markers and potential drug targets over combined populations. This study integrates genomic and systems approaches to identify a female-related set of genes that intervene in signal and metabolic pathways leading to cardiovascular disease.
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Affiliation(s)
- A Camargo
- School of Computing, University of East Anglia, Norwich, NR4 7TJ, England, UK.
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Choi KS, Chun HJ, Yi HJ, Kim JT. Intracranial invasion from recurrent angiosarcoma of the scalp. J Korean Neurosurg Soc 2008; 43:201-4. [PMID: 19096645 DOI: 10.3340/jkns.2008.43.4.201] [Citation(s) in RCA: 4] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2007] [Accepted: 04/07/2008] [Indexed: 11/27/2022] Open
Abstract
Angiosarcoma of the brain, either primary or metastatic is extremely rare. Moreover, angiosarcoma metastasizing to the brain is also highly unlike to occur comparing with metastases to the other organs. Thus, an ideal treatment strategy has not been established. A 67-year-old man with past surgical history of a scalp angiosarcoma underwent surgical resection of intracranial invasion. Because of wide scalp flap excision and resultant poor vascularity of the scalp flap, additional radiation was not provided. Because adjuvant therapy is impossible due to poor scalp condition, more careful but ample resection of the primary lesion is essential to conduct initial operation.
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Affiliation(s)
- Kyu-Sun Choi
- Department of Neurosurgery , Hanyang University Medical Center, Seoul, Korea
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Kim DW, Kim JT, Hong HK, Nam KC, Park JH. Statistical evaluation of the cleft lip nose deformity image. Conf Proc IEEE Eng Med Biol Soc 2008; 2006:3840-2. [PMID: 17945809 DOI: 10.1109/iembs.2006.260429] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Cleft lip is a congenital deformity condition with separation of the two sides of the lip and causes nose deformity. Evaluation of surgical corrections and assessment of prognosis in nose deformity depend mainly on doctor's subjective judgment. Development of an objective assessment tool in evaluation of the cleft lip nose deformity patients will help in advancement and evaluation of surgical techniques. Therefore, our study aimed on quantitative assessment of a cleft lip nose deformity by comparing following parameters gathered from a photographic image of a cleft lip patient: (1) angle difference between two nostril axes, (2) center of the nostril and distance between two centers, (3) overlapped area of two nostrils and (4) the overlapped area ratio of two nostrils. Assessment results of the nose deformity were statistically analyzed with evaluation results from three highly experienced plastic surgeons. In addition, regression model was developed using correlation relationship and factor analysis of parameters from the results of image analysis.
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Affiliation(s)
- D W Kim
- Dept. of Med. Eng., Yonsei Univ. Coll. of Medicine, Seoul.
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Abstract
The adsorption process of beta-lactoglobulin on the polyethersulfone-coated surface has been investigated using a quartz crystal microbalance with dissipation monitoring (QCM-D), which allowed simultaneous measurements of frequency and energy dissipation changes caused by the formation of a beta-lactoglobulin layer during the protein adsorption process. The results showed that the protein adsorption on the spin-coated polyethersulfone surface consisted of reversible and irreversible adsorption processes, and the irreversible adsorption was the principal factor to cause the permanent protein adsorption onto the polymer surface. The amount of irreversible adsorption of beta-lactoglobulin increased significantly, from 380.5 +/- 23.2 to 745.5 +/- 29.7 ng/cm2, when the concentration of beta-lactoglobulin solution varied from 0.1% to 2.0% (w/v). The pH also played an important role in the protein adsorption. When the pH of the solution varied from 7.0 to 3.0, the amount of irreversible adsorption of beta-lactoglobulin increased from 427.1 +/- 80.7 to 741.2 +/- 135.1 ng/cm2.
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Affiliation(s)
- J T Kim
- Dept. of Food Science, Rutgers, The State Univ. of New Jersey, 65 Dudley Rd., New Brunswick, NJ 08901, USA
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Abstract
BACKGROUND Little information is available about the accuracy of the teeth mark on the laryngeal tube (LT) as a guide to correct placement in children. The aim of this crossover study was to evaluate three methods for optimal insertion depth of the size (#) 2 tube in children weighing 12-25 kg. METHOD In 24 children, the LT #2 was consecutively inserted by three different methods: (A) until the thick teeth mark on the tube was aligned with the upper incisors, (B) until resistance was felt, and (C) by inserting to a depth, previously measured, of the curved distance between the cricoid cartilage and the upper incisor. In each case, the depth of insertion, the degree of effective ventilation, the presence of leakage, and the fibreoptic view were assessed. RESULTS Insertion based on the teeth mark led to a shorter insertion depth and a greater incidence of inadequate ventilation compared with the other two methods. There was no difference in the adequacy of ventilation between methods B and C. The vocal cords were more easily identified with methods B (62.5%) and C (75%) than with method A (12.5%). CONCLUSIONS Insertion of the LT #2 aligned with the teeth mark can result in a shallow insertion depth and inadequate ventilation. The measured distance from the cricoid cartilage to the upper incisor offers alternative guidance for correct LT insertion.
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Affiliation(s)
- J T Kim
- Department of Anesthesiology, Seoul National University College of Medicine, # 28 Yongondong, Jongnogu, Seoul 110-744, Korea
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Cho YM, Kim JT, Ko KS, Koo BK, Yang SW, Park MH, Lee HK, Park KS. Fulminant type 1 diabetes in Korea: high prevalence among patients with adult-onset type 1 diabetes. Diabetologia 2007; 50:2276-9. [PMID: 17724575 DOI: 10.1007/s00125-007-0812-z] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/09/2007] [Accepted: 08/03/2007] [Indexed: 11/28/2022]
Abstract
AIMS/HYPOTHESIS The aim of this study was to investigate the prevalence of fulminant type 1 diabetes and the clinical characteristics of the disease among newly diagnosed Korean patients. METHODS Using data retrieved from the Seoul National University Hospital database, we identified all patients newly diagnosed with type 1 diabetes from 1 January 1999 to 31 July 2006. Information on clinical manifestations and laboratory data, including the presence of islet autoantibodies detected at diagnosis, were obtained by reviewing medical records. RESULTS We identified 99 patients newly diagnosed with type 1 diabetes. Seven patients (7.1%) fulfilled the criteria for fulminant type 1 diabetes. Among the patients aged > or =18 years at onset, 30.4% had fulminant type 1 diabetes. Patients with this diabetes subtype tested negative for islet autoantibodies, had a higher age of onset (median 28 vs 10 years, p < 0.001) and a markedly shorter duration from onset of hyperglycaemic symptoms to first hospital visit (median 3 vs 30 days, p < 0.001) than patients with non-fulminant type 1 diabetes, and showed trends of increased serum aspartate aminotransferase and amylase levels and a decreased glucagon-stimulated serum C-peptide response. CONCLUSIONS/INTERPRETATION In Korea, the prevalence of fulminant type 1 diabetes was 7.1% among all patients newly diagnosed with type 1 diabetes and 30.4% among patients with adult-onset diabetes. The clinical and metabolic characteristics of the patients with fulminant type 1 diabetes were similar to those reported in Japanese studies.
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Affiliation(s)
- Y M Cho
- Department of Internal Medicine, Seoul National University College of Medicine, 28 Yongon-dong, Chongno-gu, Seoul 110-744, South Korea
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Kim JT. Initial Temporary Congestion in Latissimus Dorsi or Thoracodorsal Perforator Flaps. J Reconstr Microsurg 2006. [DOI: 10.1055/s-2006-949059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Kim JT. Change of Concept in Head and Neck Reconstruction by Various Perforator Flaps. J Reconstr Microsurg 2006. [DOI: 10.1055/s-2006-948993] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Kim JT. Various Clinical Applications of Pedicle T-Anastomosis in Free Flap Reconstruction. J Reconstr Microsurg 2006. [DOI: 10.1055/s-2006-947923] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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