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Uta M, Felfernig A, Le VM, Tran TNT, Garber D, Lubos S, Burgstaller T. Knowledge-based recommender systems: overview and research directions. Front Big Data 2024; 7:1304439. [PMID: 38469430 PMCID: PMC10925703 DOI: 10.3389/fdata.2024.1304439] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2023] [Accepted: 02/06/2024] [Indexed: 03/13/2024] Open
Abstract
Recommender systems are decision support systems that help users to identify items of relevance from a potentially large set of alternatives. In contrast to the mainstream recommendation approaches of collaborative filtering and content-based filtering, knowledge-based recommenders exploit semantic user preference knowledge, item knowledge, and recommendation knowledge, to identify user-relevant items which is of specific relevance when dealing with complex and high-involvement items. Such recommenders are primarily applied in scenarios where users specify (and revise) their preferences, and related recommendations are determined on the basis of constraints or attribute-level similarity metrics. In this article, we provide an overview of the existing state-of-the-art in knowledge-based recommender systems. Different related recommendation techniques are explained on the basis of a working example from the domain of survey software services. On the basis of our analysis, we outline different directions for future research.
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Affiliation(s)
| | - Alexander Felfernig
- Institute of Software Technology (IST) - Applied Software Engineering & Ai Research Group (ASE), Graz University of Technology, Graz, Austria
| | - Viet-Man Le
- Institute of Software Technology (IST) - Applied Software Engineering & Ai Research Group (ASE), Graz University of Technology, Graz, Austria
| | - Thi Ngoc Trang Tran
- Institute of Software Technology (IST) - Applied Software Engineering & Ai Research Group (ASE), Graz University of Technology, Graz, Austria
| | - Damian Garber
- Institute of Software Technology (IST) - Applied Software Engineering & Ai Research Group (ASE), Graz University of Technology, Graz, Austria
| | - Sebastian Lubos
- Institute of Software Technology (IST) - Applied Software Engineering & Ai Research Group (ASE), Graz University of Technology, Graz, Austria
| | - Tamim Burgstaller
- Institute of Software Technology (IST) - Applied Software Engineering & Ai Research Group (ASE), Graz University of Technology, Graz, Austria
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Rubio-Giménez V, Carraro F, Hofer S, Fratschko M, Stassin T, Rodríguez-Hermida S, Schrode B, Barba L, Resel R, Falcaro P, Ameloot R. Polymorphism and orientation control of copper-dicarboxylate metal-organic framework thin films through vapour- and liquid-phase growth. CrystEngComm 2024; 26:1071-1076. [PMID: 38384732 PMCID: PMC10877460 DOI: 10.1039/d3ce01296d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2023] [Accepted: 02/02/2024] [Indexed: 02/23/2024]
Abstract
Precise control over the crystalline phase and crystallographic orientation within thin films of metal-organic frameworks (MOFs) is highly desirable. Here, we report a comparison of the liquid- and vapour-phase film deposition of two copper-dicarboxylate MOFs starting from an oriented metal hydroxide precursor. X-ray diffraction revealed that the vapour- or liquid-phase reaction of the linker with this precursor results in different crystalline phases, morphologies, and orientations. Pole figure analysis showed that solution-based growth of the MOFs follows the axial texture of the metal hydroxide precursor, resulting in heteroepitaxy. In contrast, the vapour-phase method results in non-epitaxial growth with uniplanar texture only.
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Affiliation(s)
- Víctor Rubio-Giménez
- Centre for Membrane Separations, Adsorption, Catalysis and Spectroscopy (cMACS), KU Leuven Celestijnenlaan 200F 3001 Leuven Belgium
| | - Francesco Carraro
- Institute of Physical and Theoretical Chemistry, Graz University of Technology Stremayrgasse 9/Z2 8010 Graz Austria
| | - Sebastian Hofer
- Institute of Solid State Physics, Graz University of Technology Petersgasse 16 8010 Graz Austria
| | - Mario Fratschko
- Institute of Solid State Physics, Graz University of Technology Petersgasse 16 8010 Graz Austria
| | - Timothée Stassin
- Centre for Membrane Separations, Adsorption, Catalysis and Spectroscopy (cMACS), KU Leuven Celestijnenlaan 200F 3001 Leuven Belgium
| | - Sabina Rodríguez-Hermida
- Centre for Membrane Separations, Adsorption, Catalysis and Spectroscopy (cMACS), KU Leuven Celestijnenlaan 200F 3001 Leuven Belgium
| | - Benedikt Schrode
- Institute of Solid State Physics, Graz University of Technology Petersgasse 16 8010 Graz Austria
| | - Luisa Barba
- Istituto di Cristallografia - Sincrotrone Elettra, Consiglio Nazionale delle Ricerche Area Science Park 34142 Basovizza Italy
| | - Roland Resel
- Institute of Solid State Physics, Graz University of Technology Petersgasse 16 8010 Graz Austria
| | - Paolo Falcaro
- Institute of Physical and Theoretical Chemistry, Graz University of Technology Stremayrgasse 9/Z2 8010 Graz Austria
| | - Rob Ameloot
- Centre for Membrane Separations, Adsorption, Catalysis and Spectroscopy (cMACS), KU Leuven Celestijnenlaan 200F 3001 Leuven Belgium
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Felfernig A, Wundara M, Tran TNT, Polat-Erdeniz S, Lubos S, El Mansi M, Garber D, Le VM. Recommender systems for sustainability: overview and research issues. Front Big Data 2023; 6:1284511. [PMID: 37965497 PMCID: PMC10642936 DOI: 10.3389/fdata.2023.1284511] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2023] [Accepted: 10/09/2023] [Indexed: 11/16/2023] Open
Abstract
Sustainability development goals (SDGs) are regarded as a universal call to action with the overall objectives of planet protection, ending of poverty, and ensuring peace and prosperity for all people. In order to achieve these objectives, different AI technologies play a major role. Specifically, recommender systems can provide support for organizations and individuals to achieve the defined goals. Recommender systems integrate AI technologies such as machine learning, explainable AI (XAI), case-based reasoning, and constraint solving in order to find and explain user-relevant alternatives from a potentially large set of options. In this article, we summarize the state of the art in applying recommender systems to support the achievement of sustainability development goals. In this context, we discuss open issues for future research.
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Affiliation(s)
- Alexander Felfernig
- Applied Software Engineering & AI, Institute of Software Technology, Graz University of Technology, Graz, Austria
| | | | - Thi Ngoc Trang Tran
- Applied Software Engineering & AI, Institute of Software Technology, Graz University of Technology, Graz, Austria
| | - Seda Polat-Erdeniz
- Applied Software Engineering & AI, Institute of Software Technology, Graz University of Technology, Graz, Austria
| | - Sebastian Lubos
- Applied Software Engineering & AI, Institute of Software Technology, Graz University of Technology, Graz, Austria
| | - Merfat El Mansi
- Applied Software Engineering & AI, Institute of Software Technology, Graz University of Technology, Graz, Austria
| | - Damian Garber
- Applied Software Engineering & AI, Institute of Software Technology, Graz University of Technology, Graz, Austria
| | - Viet-Man Le
- Applied Software Engineering & AI, Institute of Software Technology, Graz University of Technology, Graz, Austria
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Klokic S, Naumenko D, Marmiroli B, Carraro F, Linares-Moreau M, Zilio SD, Birarda G, Kargl R, Falcaro P, Amenitsch H. Unraveling the timescale of the structural photo-response within oriented metal-organic framework films. Chem Sci 2022; 13:11869-11877. [PMID: 36320901 PMCID: PMC9580475 DOI: 10.1039/d2sc02405e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Accepted: 09/09/2022] [Indexed: 08/10/2023] Open
Abstract
Fundamental knowledge on the intrinsic timescale of structural transformations in photo-switchable metal-organic framework films is crucial to tune their switching performance and to facilitate their applicability as stimuli-responsive materials. In this work, for the first time, an integrated approach to study and quantify the temporal evolution of structural transformations is demonstrated on an epitaxially oriented DMOF-1-on-MOF film system comprising azobenzene in the DMOF-1 pores (DMOF-1/AB). We employed time-resolved Grazing Incidence Wide-Angle X-Ray Scattering measurements to track the structural response of the DMOF-1/AB film upon altering the length of the azobenzene molecule by photo-isomerization (trans-to-cis, 343 nm; cis-to-trans, 450 nm). Within seconds, the DMOF-1/AB response occurred fully reversible and over several switching cycles by cooperative photo-switching of the oriented DMOF-1/AB crystallites as confirmed further by infrared measurements. Our work thereby suggests a new avenue to elucidate the timescales and photo-switching characteristics in structurally responsive MOF film systems.
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Affiliation(s)
- Sumea Klokic
- Institute of Inorganic Chemistry, Graz University of Technology 8010 Graz Austria
| | - Denys Naumenko
- Institute of Inorganic Chemistry, Graz University of Technology 8010 Graz Austria
| | - Benedetta Marmiroli
- Institute of Inorganic Chemistry, Graz University of Technology 8010 Graz Austria
| | - Francesco Carraro
- Institute of Physical and Theoretical Chemistry, Graz University of Technology 8010 Graz Austria
| | - Mercedes Linares-Moreau
- Institute of Physical and Theoretical Chemistry, Graz University of Technology 8010 Graz Austria
| | - Simone Dal Zilio
- IOM-CNR, Laboratorio TASC S.S. 14, 163.5 km, Basovizza Trieste 34149 Italy
| | - Giovanni Birarda
- Elettra Sincrotrone Trieste - SISSI Bio Beamline S.S. 14, 163.5 km, Basovizza Trieste 34149 Italy
| | - Rupert Kargl
- Institute of Chemistry and Technology of Bio-Based Systems, Graz University of Technology 8010 Graz Austria
| | - Paolo Falcaro
- Institute of Physical and Theoretical Chemistry, Graz University of Technology 8010 Graz Austria
| | - Heinz Amenitsch
- Institute of Inorganic Chemistry, Graz University of Technology 8010 Graz Austria
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Abstract
Camouflage is a widespread strategy to increase survival. The cryptic plumage colouration of precocial chicks improves camouflage often through disruptive colouration. Here, we examine whether and how fringed neoptile feathers conceal the outline of chicks. We first conducted a digital experiment to test two potential mechanisms for outline concealment through appendages: (1) reduction of edge intensity and (2) luminance transition. Local Edge Intensity Analysis showed that appendages decreased edge intensity whereas a mean luminance comparison revealed that the appendages created an intermediate transition zone to conceal the object's outline. For edge intensity, the outline diffusion was strongest for a vision system with low spatial acuity, which is characteristic of many mammalian chick predators. We then analysed photographs of young snowy plover (Charadrius nivosus) chicks to examine whether feathers increase outline concealment in a natural setting. Consistent with better camouflage, the outline of digitally cropped chicks with protruding feathers showed lower edge intensities than the outline of chicks without those feathers. However, the observed mean luminance changes did not indicate better concealment. Taken together, our results suggest that thin skin appendages such as neoptile feathers improve camouflage. As skin appendages are widespread, this mechanism may apply to many organisms.
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Affiliation(s)
- Veronika A Rohr
- Research Group for Behavioural Genetics and Evolutionary Ecology, Max Planck Institute for Ornithology, Seewiesen, Germany.
- Division of Evolutionary Biology, Faculty of Biology, Ludwig-Maximilians-Universität München, Planegg-Martinsried, Germany.
| | - Tamara Volkmer
- Department of Migration, Max Planck Institute of Animal Behavior, Radolfzell, Germany
| | - Dirk Metzler
- Division of Evolutionary Biology, Faculty of Biology, Ludwig-Maximilians-Universität München, Planegg-Martinsried, Germany
| | - Clemens Küpper
- Research Group for Behavioural Genetics and Evolutionary Ecology, Max Planck Institute for Ornithology, Seewiesen, Germany.
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Carraro F, Velásquez-Hernández MDJ, Astria E, Liang W, Twight L, Parise C, Ge M, Huang Z, Ricco R, Zou X, Villanova L, Kappe CO, Doonan C, Falcaro P. Phase dependent encapsulation and release profile of ZIF-based biocomposites. Chem Sci 2020; 11:3397-3404. [PMID: 34777742 PMCID: PMC8529536 DOI: 10.1039/c9sc05433b] [Citation(s) in RCA: 56] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2019] [Accepted: 02/13/2020] [Indexed: 11/29/2022] Open
Abstract
Biocomposites composed of Zeolitic Imidazolate Frameworks (ZIFs) are generating significant interest due to their facile synthesis, and capacity to protect proteins from harsh environments. Here we systematically varied the composition (i.e. relative amounts of ligand (2-methylimidazole), metal precursor (Zn(OAc)2·2H2O), and protein) and post synthetic treatments (i.e. washes with water or water/ethanol) to prepare a series of protein@ZIF biocomposites. These data were used to construct two ternary phase diagrams that showed the synthesis conditions employed gave rise to five different phases including, for the first time, biocomposites based on ZIF-CO3-1. We examined the influence of the different phases on two properties relevant to drug delivery applications: encapsulation efficiency and release profile. The encapsulation efficiencies of bovine serum albumin and insulin were phase dependent and ranged from 75% to 100%. In addition, release profiles showed that 100% protein release varied between 40 and 300 minutes depending on the phase. This study provides a detailed compositional map for the targeted preparation of ZIF-based biocomposites of specific phases and a tool for the straightforward analysis of the crystalline phases of ZIF based materials (web application named "ZIF phase analysis"). These data will facilitate the progress of ZIF bio-composites in the fields of biomedicine and biotechnology.
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Affiliation(s)
- F Carraro
- Institute of Physical and Theoretical Chemistry, Graz University of Technology Stremayrgasse 9 Graz 8010 Austria
| | - M de J Velásquez-Hernández
- Institute of Physical and Theoretical Chemistry, Graz University of Technology Stremayrgasse 9 Graz 8010 Austria
| | - E Astria
- Institute of Physical and Theoretical Chemistry, Graz University of Technology Stremayrgasse 9 Graz 8010 Austria
| | - W Liang
- Department of Chemistry and the Centre for Advanced Nanomaterials, The University of Adelaide Adelaide South Australia 5005 Australia
| | - L Twight
- Institute of Physical and Theoretical Chemistry, Graz University of Technology Stremayrgasse 9 Graz 8010 Austria
| | - C Parise
- Institute of Physical and Theoretical Chemistry, Graz University of Technology Stremayrgasse 9 Graz 8010 Austria
- Institute of Chemistry, University of Graz, NAWI Graz Heinrichstrasse 28 8010 Graz Austria
- Dipartimento di Chimica Industriale "Toso Montanari", Universita' di Bologna Viale del Risorgimento 4 Bologna Italy
| | - M Ge
- Department of Materials and Environmental Chemistry, Stockholm University 106 91 Stockholm Sweden
| | - Z Huang
- Department of Materials and Environmental Chemistry, Stockholm University 106 91 Stockholm Sweden
| | - R Ricco
- Institute of Physical and Theoretical Chemistry, Graz University of Technology Stremayrgasse 9 Graz 8010 Austria
| | - X Zou
- Department of Materials and Environmental Chemistry, Stockholm University 106 91 Stockholm Sweden
| | - L Villanova
- Faculty of Technical Chemistry, Chemical and Process Engineering, Biotechnology, Graz University of Technology Petersgasse 10-12 8010 Graz Austria
| | - C O Kappe
- Institute of Chemistry, University of Graz, NAWI Graz Heinrichstrasse 28 8010 Graz Austria
| | - C Doonan
- Department of Chemistry and the Centre for Advanced Nanomaterials, The University of Adelaide Adelaide South Australia 5005 Australia
| | - P Falcaro
- Institute of Physical and Theoretical Chemistry, Graz University of Technology Stremayrgasse 9 Graz 8010 Austria
- Department of Chemistry and the Centre for Advanced Nanomaterials, The University of Adelaide Adelaide South Australia 5005 Australia
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