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Park JE, Park JW, Sim MK, Kim SR, Kim KS. Inhibition of DAPK3 Suppresses Radiation-Induced Cellular Senescence by Activation of a PGC1α-Dependent Metabolism Pathway in Brain Endothelial Cells. J Gerontol A Biol Sci Med Sci 2024; 79:glae088. [PMID: 38563090 DOI: 10.1093/gerona/glae088] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2023] [Indexed: 04/04/2024] Open
Abstract
In the brain, environmental changes, such as neuroinflammation, can induce senescence, characterized by the decreased proliferation of neurons and dendrites and synaptic and vascular damage, resulting in cognitive decline. Senescence promotes neuroinflammatory disorders by senescence-associated secretory phenotypes and reactive oxygen species. In human brain microvascular endothelial cells (HBMVECs), we demonstrate that chronological aging and irradiation increase death-associated protein kinase 3 (DAPK3) expression. To confirm the role of DAPK3 in HBMVEC senescence, we disrupted DAPK3 activity using small interfering RNA (siRNA) or a dominant-negative mutant (DAPK3-P216S), which reduced cellular senescence phenotypes, as assessed by changes in tube formation, senescence-associated beta-galactosidase activity, and cell proliferation. In endothelial cells, DAPK3 promotes cellular senescence by regulating the phosphorylation and inactivation of peroxisome proliferator-activated receptor gamma coactivator 1 alpha (PGC1α) via the protein kinase B pathway, resulting in the decreased expression of mitochondrial metabolism-associated genes, such as ATP5G1, BDNF, and COX5A. Our studies show that DAPK3 is involved in cellular senescence and PGC1α regulation, suggesting that DAPK3 regulation may be important for treating aging-related brain diseases or the response to radiation therapy.
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Affiliation(s)
- Ji-Eun Park
- Divisions of Radiation Biomedical Research, Korea Institute of Radiological and Medical Sciences, Seoul, Republic of Korea
- School of Radiological & Medico-Oncological Science, University of Science & Technology, Daejeon, Republic of Korea
| | - Jeong Woo Park
- New Drug Development Center, Daegu-Gyeongbuk Medical Innovation Foundation, Daegu, Republic of Korea
| | - Myong-Kyu Sim
- Divisions of Radiation Biomedical Research, Korea Institute of Radiological and Medical Sciences, Seoul, Republic of Korea
| | - So Ra Kim
- Divisions of Radiation Biomedical Research, Korea Institute of Radiological and Medical Sciences, Seoul, Republic of Korea
| | - Kwang Seok Kim
- Divisions of Radiation Biomedical Research, Korea Institute of Radiological and Medical Sciences, Seoul, Republic of Korea
- School of Radiological & Medico-Oncological Science, University of Science & Technology, Daejeon, Republic of Korea
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Savitri C, Ha SS, Kwon JW, Kim SH, Kim Y, Park HM, Kwon H, Ji MJ, Park K. Human Fibroblast-Derived Matrix Hydrogel Accelerates Regenerative Wound Remodeling Through the Interactions with Macrophages. Adv Sci (Weinh) 2024; 11:e2305852. [PMID: 38476050 PMCID: PMC11095160 DOI: 10.1002/advs.202305852] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2023] [Revised: 02/21/2024] [Indexed: 03/14/2024]
Abstract
Herein, a novel extracellular matrix (ECM) hydrogel is proposed fabricated solely from decellularized, human fibroblast-derived matrix (FDM) toward advanced wound healing. This FDM-gel is physically very stable and viscoelastic, while preserving the natural ECM diversity and various bioactive factors. Subcutaneously transplanted FDM-gel provided a permissive environment for innate immune cells infiltration. Compared to collagen hydrogel, excellent wound healing indications of FDM-gel treated in the full-thickness wounds are noticed, particularly hair follicle formation via highly upregulated β-catenin. Sequential analysis of the regenerated wound tissues disclosed that FDM-gel significantly alleviated pro-inflammatory cytokine and promoted M2-like macrophages, along with significantly elevated vascular endothelial growth factor (VEGF) and basic fibroblast growth factor (bFGF) level. A mechanistic study demonstrated that macrophages-FDM interactions through cell surface integrins α5β1 and α1β1 resulted in significant production of VEGF and bFGF, increased Akt phosphorylation, and upregulated matrix metalloproteinase-9 activity. Interestingly, blocking such interactions using specific inhibitors (ATN161 for α5β1 and obtustatin for α1β1) negatively affected those pro-healing growth factors secretion. Macrophages depletion animal model significantly attenuated the healing effect of FDM-gel. This study demonstrates that the FDM-gel is an excellent immunomodulatory material that is permissive for host cells infiltration, resorbable with time, and interactive with macrophages, where it thus enables regenerative matrix remodeling toward a complete wound healing.
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Affiliation(s)
- Cininta Savitri
- Center for BiomaterialsKorea Institute of Science and Technology (KIST)Seoul02792Republic of Korea
| | - Sang Su Ha
- Center for BiomaterialsKorea Institute of Science and Technology (KIST)Seoul02792Republic of Korea
| | - Jae Won Kwon
- Center for BiomaterialsKorea Institute of Science and Technology (KIST)Seoul02792Republic of Korea
- Division of Bio‐Medical Science and Technology, KIST SchoolUniversity of Science and Technology (UST)Seoul02792Republic of Korea
| | - Sung Hoon Kim
- Center for BiomaterialsKorea Institute of Science and Technology (KIST)Seoul02792Republic of Korea
| | - Young‐Min Kim
- Center for BiomaterialsKorea Institute of Science and Technology (KIST)Seoul02792Republic of Korea
- Division of Bio‐Medical Science and Technology, KIST SchoolUniversity of Science and Technology (UST)Seoul02792Republic of Korea
| | - Hyun Mee Park
- Advanced Analysis and Data CenterKISTSeoul02792Republic of Korea
| | - Haejin Kwon
- Advanced Analysis and Data CenterKISTSeoul02792Republic of Korea
| | - Mi Jung Ji
- Advanced Analysis and Data CenterKISTSeoul02792Republic of Korea
| | - Kwideok Park
- Center for BiomaterialsKorea Institute of Science and Technology (KIST)Seoul02792Republic of Korea
- Division of Bio‐Medical Science and Technology, KIST SchoolUniversity of Science and Technology (UST)Seoul02792Republic of Korea
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Kandel MR, Pan UN, Dhakal PP, Ghising RB, Sidra S, Kim DH, Kim NH, Lee JH. Manganese-Doped Bimetallic (Co,Ni) 2P Integrated CoP in N,S Co-Doped Carbon: Unveiling a Compatible Hybrid Electrocatalyst for Overall Water Splitting. Small 2024; 20:e2307241. [PMID: 38126908 DOI: 10.1002/smll.202307241] [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] [Subscribe] [Scholar Register] [Received: 08/21/2023] [Revised: 11/18/2023] [Indexed: 12/23/2023]
Abstract
Rational design of highly efficient noble-metal-unbound electrodes for hydrogen and oxygen production at increased current density is crucial for robust water-splitting. A facile hydrothermal and room-temperature aging method is presented, followed by chemical vapor deposition (CVD), to create a self-sacrificed hybrid heterostructure electrocatalyst. This hybrid material, (Mn-(Co,Ni)2P/CoP/(N,S)-C), comprises manganese-doped cobalt nickel phosphide (Mn-(Co,Ni)2P) nanofeathers and cobalt phosphide (CoP) nanocubes embedded in a nitrogen and sulfur co-doped carbon matrix (N,S)-C on nickel foam. The catalyst exhibits excellent performance in both the hydrogen evolution reaction (HER; η10 = 61 mV) and oxygen evolution reaction (OER; η10 = 213 mV) due to abundant active sites, high porosity, and enhanced hetero-interface interaction between Mn-(Co2P-Ni2P) CoP, and (N,S)-C supported by significant synergistic effects observed among different phases through density functional theory (DFT) calculations. Impressively, (Mn-(Co,Ni)2P/CoP/(N,S)-C (+,-) shows an extra low cell voltage of 1.49 V@10 mA cm-2. Moreover, the catalyst exhibits remarkable stability at 100 and 300 mA cm-2 when operating as a single stack cell electrolyzer. The superior electrochemical activity is attributed to the enhanced electrode-electrolyte interface among the multiple phases of the hybrid structure.
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Affiliation(s)
- Mani Ram Kandel
- Department of Nano Convergence Engineering (BK21 Four), Jeonbuk National University, Jeonju, Jeonbuk, 54896, Republic of Korea
- Department of Chemistry, Tribhuvan University, Amrit Campus, Kathmandu, 44613, Nepal
| | - Uday Narayan Pan
- Department of Nano Convergence Engineering (BK21 Four), Jeonbuk National University, Jeonju, Jeonbuk, 54896, Republic of Korea
| | - Purna Prasad Dhakal
- Department of Nano Convergence Engineering (BK21 Four), Jeonbuk National University, Jeonju, Jeonbuk, 54896, Republic of Korea
| | - Ram Babu Ghising
- Department of Nano Convergence Engineering (BK21 Four), Jeonbuk National University, Jeonju, Jeonbuk, 54896, Republic of Korea
| | - Saleem Sidra
- Division of Science Education, Graduate School of Department of Energy Storage/Conversion Engineering, Jeonbuk National University, Jeonju, Jeonbuk, 54896, Republic of Korea
| | - Do Hwan Kim
- Division of Science Education, Graduate School of Department of Energy Storage/Conversion Engineering, Jeonbuk National University, Jeonju, Jeonbuk, 54896, Republic of Korea
| | - Nam Hoon Kim
- Department of Nano Convergence Engineering (BK21 Four), Jeonbuk National University, Jeonju, Jeonbuk, 54896, Republic of Korea
| | - Joong Hee Lee
- Department of Nano Convergence Engineering (BK21 Four), Jeonbuk National University, Jeonju, Jeonbuk, 54896, Republic of Korea
- Carbon Composite Research Centre, Department of Polymer-Nano Science and Technology, Jeonbuk National University, Jeonju, Jeonbuk, 54896, Republic of Korea
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Moon JH, Oh E, Koo TM, Jeon YS, Jang YJ, Fu HE, Ko MJ, Kim YK. One-Step Electrochemical Synthesis of Multiyolk-Shell Nanocoils for Exceptional Photocatalytic Performance. Adv Mater 2024; 36:e2312214. [PMID: 38190643 DOI: 10.1002/adma.202312214] [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] [Subscribe] [Scholar Register] [Received: 11/15/2023] [Revised: 12/21/2023] [Indexed: 01/10/2024]
Abstract
Multiyolk-shell (mYS) nanostructures have garnered significant interest in various photocatalysis applications such as water splitting and waste treatment. Nonetheless, the complexity and rigorous conditions for the synthesis have hindered their widespread implementation. This study presents a one-step electrochemical strategy for synthesizing multiyolk-shell nanocoils (mYSNC), wherein multiple cores of noble metal nanoparticles, such as Au, are embedded within the hollow coil-shaped FePO4 shell structures, mitigating the challenges posed by conventional methods. By capitalizing on the dissimilar dissolution rates of bimetallic alloy nanocoils in an electrochemically programmed solution, nanocoils of different shapes and materials, including two variations of mYSNCs are successfully fabricated. The resulting Au-FePO4 mYSNCs exhibit exceptional photocatalytic performance for environmental remediation, demonstrating up to 99% degradation of methylene blue molecules within 50 min and 95% degradation of tetracycline within 100 min under ultraviolet-visible (UV-vis) light source. This remarkable performance can be attributed to the abundant electrochemical active sites, internal voids facilitating efficient light harvesting with coil morphology, amplified localized surface plasmon resonance (LSPR) at the plasmonic nanoparticle-semiconductor interface, and effective band engineering. The innovative approach utilizing bimetallic alloys demonstrates precise geometric control and design of intricate multicomponent hybrid composites, showcasing the potential for developing versatile hollow nanomaterials for catalytic applications.
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Affiliation(s)
- Jun Hwan Moon
- Department of Materials Science and Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - Eunsoo Oh
- Department of Materials Science and Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - Thomas Myeongseok Koo
- Department of Materials Science and Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - Yoo Sang Jeon
- Institute of Engineering Research, Korea University, Seoul, 02841, Republic of Korea
| | - Young Jun Jang
- Department of Semiconductor Systems Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - Hong En Fu
- Department of Materials Science and Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - Min Jun Ko
- Department of Radiology, Feinberg School of Medicine, Northwestern University, Chicago, IL, 60611, USA
| | - Young Keun Kim
- Department of Materials Science and Engineering, Korea University, Seoul, 02841, Republic of Korea
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Kumar M, Kim D, Seo H. Flexo-Pyrophotronic Effect Modulated Giant Near Infrared Photoresponse from VO 2 -Based Heterojunction for Optical Communication. Small Methods 2024; 8:e2300425. [PMID: 37423964 DOI: 10.1002/smtd.202300425] [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] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Revised: 06/12/2023] [Indexed: 07/11/2023]
Abstract
The flexoelectric phenomenon, which occurs when materials undergo mechanical deformation and cause strain gradients and a related spontaneous electric polarization field, can result in wide variety of energy- and cost-saving mechano-opto-electronics, such as night vision, communication, and security. However, accurate sensing of weak intensities under self-powered conditions with stable photocurrent and rapid temporal response remains essential despite the challenges related to having suitable band alignment and high junction quality. Taking use of the flexoelectric phenomena, it is shown that a centrosymmetric VO2 -based heterojunction exhibits a self-powered (i.e., 0 V), infrared (λ = 940 nm) photoresponse. Specifically, the device shows giant current modulation (103 %), good responsivity of >2.4 mA W-1 , reasonable specific detectivity of ≈1010 Jones, and a fast response speed of 0.5 ms, even at the nanoscale modulation. Through manipulation of the applied inhomogeneous force, the sensitivity of the infrared response is enhanced (> 640%). Ultrafast night optical communication like Morse code distress (SOS) signal sensing and high-performing obstacle sensors with potential impact alarms are created as proof-of-concept applications. These findings validate the potential of emerging mechanoelectrical coupling for a wide variety of novel applications, including mechanoptical switches, photovoltaics, sensors, and autonomous vehicles, which require tunable optoelectronic performance.
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Affiliation(s)
- Mohit Kumar
- Department of Energy Systems Research, Ajou University, Suwon, 16499, Republic of Korea
- Department of Materials Science and Engineering, Ajou University, Suwon, 16499, Republic of Korea
| | - Dukhwan Kim
- Department of Energy Systems Research, Ajou University, Suwon, 16499, Republic of Korea
| | - Hyungtak Seo
- Department of Energy Systems Research, Ajou University, Suwon, 16499, Republic of Korea
- Department of Materials Science and Engineering, Ajou University, Suwon, 16499, Republic of Korea
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Bang M, Heo Y, Choi TK, Lee SH. Positive Effects of Uric Acid on White Matter Microstructures and Treatment Response in Patients With Schizophrenia. Schizophr Bull 2024:sbae008. [PMID: 38300803 DOI: 10.1093/schbul/sbae008] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2024]
Abstract
BACKGROUND AND HYPOTHESIS Schizophrenia involves microstructural changes in white matter (WM) tracts. Oxidative stress is a key factor causing WM damage by hindering oligodendrocyte development and myelin maturation. Uric acid (UA), an endogenous antioxidant, may protect against oxidative stress. We investigated the effect of UA on WM connectivity in antipsychotic-naive or -free patients with early- or chronic-stage schizophrenia. STUDY DESIGN A total of 192 patients with schizophrenia (122 recent-onset [ROS] and 70 chronic [CS]) and 107 healthy controls (HCs) participated in this study. Diffusion tensor imaging data and serum UA levels at baseline were obtained. STUDY RESULTS Fractional anisotropy was lower in the widespread WM regions across the whole brain, and diffusivity measures were higher in both schizophrenia groups than in HCs. The CS group showed lower diffusivity in some WM tracts than the ROS or HC groups. The linear relationship of serum UA levels with axial and mean diffusivity in the right frontal region was significantly different between schizophrenia stages, which was driven by a negative association in the CS group. WM diffusivity associated with serum UA levels correlated with 8-week treatment responses only in patients with CS, suggesting UA to be protective against long-term schizophrenia. CONCLUSIONS UA may protect against the WM damage associated with the progression of schizophrenia by reducing oxidative stress and supporting WM repair against oxidative damage. These results provide insights into the positive role of UA and may facilitate the development of novel disease-modifying therapies.
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Affiliation(s)
- Minji Bang
- Department of Psychiatry, CHA Bundang Medical Center, CHA University School of Medicine, Seongnam, Republic of Korea
| | - Yul Heo
- Department of Psychiatry, CHA Bundang Medical Center, CHA University School of Medicine, Seongnam, Republic of Korea
| | - Tai Kiu Choi
- Department of Psychiatry, CHA Bundang Medical Center, CHA University School of Medicine, Seongnam, Republic of Korea
| | - Sang-Hyuk Lee
- Department of Psychiatry, CHA Bundang Medical Center, CHA University School of Medicine, Seongnam, Republic of Korea
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Methiyothin T, Ahn I. Comparison of geological clusters between influenza and COVID-19 in Thailand with unsupervised clustering analysis. PLoS One 2024; 19:e0296888. [PMID: 38252644 PMCID: PMC10802941 DOI: 10.1371/journal.pone.0296888] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2023] [Accepted: 12/21/2023] [Indexed: 01/24/2024] Open
Abstract
The coronavirus disease (COVID-19) pandemic has considerably impacted public health, including the transmission patterns of other respiratory pathogens, such as the 2009 pandemic influenza (H1N1). COVID-19 and influenza are both respiratory infections that started with a lack of vaccination-based immunity in the population. However, vaccinations have been administered over time, resulting in a transition of the status of both diseases from a pandemic to an endemic. In this study, unsupervised clustering techniques were used to identify clusters of disease trends in Thailand. The analysis incorporated three distinct surveillance datasets: the pandemic influenza outbreak, influenza in the endemic stage, and the early stages of COVID-19. The analysis demonstrated a significant difference in the distribution of provinces between Cluster -1, representing those with unique transmission patterns, and the other clusters, indicating provinces with similar transmission patterns among their members. Specifically, for Pandemic Influenza, the ratio was 61:16, while for Pandemic COVID-19, it was 65:12. In contrast, Endemic Influenza exhibited a ratio of 46:31, with a notable emergence of more clustered provinces in the southern, western, and central regions. Furthermore, a pair of provinces with highly similar spreading patterns were identified during the pandemic stages of both influenza and COVID-19. Although the similarity decreased slightly for endemic influenza, they still belonged to the same cluster. Our objective was to identify the transmission patterns of influenza and COVID-19, with the aim of providing quantitative and spatial information to aid public health management in preparing for future pandemics or transitioning into an endemic phase.
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Affiliation(s)
- Thanin Methiyothin
- Department of Data-Centric Problem Solving Research, Infectious Disease AI Team, Korea Institute of Science and Technology Information, Yuseong-gu, Daejeon, Republic of Korea
- Department of Applied AI, University of Science & Technology, Yuseong-gu, Daejeon, Republic of Korea
| | - Insung Ahn
- Department of Data-Centric Problem Solving Research, Infectious Disease AI Team, Korea Institute of Science and Technology Information, Yuseong-gu, Daejeon, Republic of Korea
- Department of Applied AI, University of Science & Technology, Yuseong-gu, Daejeon, Republic of Korea
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Kim S, Chung H, Kwak JE, Kim YR, Park CH, Kim Y, Cheong JW, Wu J, Shin EC, Cho H, Kim JS. Clearing soluble MIC reverses the impaired function of natural killer cells from patients with multiple myeloma. J Immunother Cancer 2024; 12:e007886. [PMID: 38191242 PMCID: PMC10806558 DOI: 10.1136/jitc-2023-007886] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/28/2023] [Indexed: 01/10/2024] Open
Abstract
BACKGROUND Major histocompatibility complex (MHC) class I chain-related protein (MIC) is a stress-induced ligand released from multiple myeloma (MM) cells during progression, and soluble MIC impairs natural killer group 2D (NKG2D) activating receptor-mediated recognition and function of natural killer (NK) cells. However, whether clearing soluble MIC with a monoclonal antibody (mAb) can restore NK cell activity of MM patients remains undetermined. METHODS We analyzed The Cancer Genome Atlas (TCGA) Multiple Myeloma Research Foundation (MMRF) CoMMpass data set to examine the prognostic significance of MIC expression in MM. We examined the level of soluble MIC in paired peripheral blood (PB) and bone marrow (BM) plasma of patients with MM at diagnosis by ELISA. We evaluated the correlation between the level of soluble MIC and immunophenotype of NK cells from MM patients by multicolor flow cytometry. We also generated MIC-overexpressing MM cell line and characterized the cytotoxic function of patient NK cells in the presence of soluble MIC, and examined the impact of clearing soluble MIC with a humanized mAb (huB10G5). RESULTS We characterize the importance of MICA in MM by revealing the significantly better overall survival of patients with high MICA expression from TCGA MMRF CoMMpass data set. The level of soluble MICA is more highly elevated in MM than in precursor stages, and the concentration of soluble MICA is higher in BM plasma than in PB. The concentration of soluble MICA in BM was correlated with myeloma burden, while it was negatively correlated with the frequency of NKG2D+ NK cells in diagnostic BM aspirates of MM patients. Soluble MICA downregulated NKG2D expression and decreased cytotoxicity of MM patient NK cells ex vivo, which were reversed by a humanized soluble MIC-clearing mAb (huB10G5) with enhanced degranulation of NK cells. CONCLUSIONS Our findings indicate targeting soluble MIC with huB10G5 might be a viable therapeutic approach to promote NKG2D-dependent cellular immunotherapy outcome in MM.
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Affiliation(s)
- Sojeong Kim
- Division of Hematology, Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea (the Republic of)
| | - Haerim Chung
- Division of Hematology, Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea (the Republic of)
| | - Jeong-Eun Kwak
- Division of Hematology, Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea (the Republic of)
| | - Yu Ri Kim
- Division of Hematology, Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea (the Republic of)
| | - Chung Hyun Park
- Division of Hematology, Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea (the Republic of)
| | - Yeonhee Kim
- Division of Hematology, Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea (the Republic of)
| | - June-Won Cheong
- Division of Hematology, Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea (the Republic of)
| | - Jennifer Wu
- Department of Urology and Department of Microbiology and Immunology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA
| | - Eui-Cheol Shin
- Graduate School of Medical Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Korea (the Republic of)
| | - Hyunsoo Cho
- Division of Hematology, Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea (the Republic of)
| | - Jin Seok Kim
- Division of Hematology, Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea (the Republic of)
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Jeon WH, Moon HS, Choi J, Jung B, Kim Y, Hwang S, Lee SH. An Automatic-Vertical Profile Monitoring System for Fresh-Saline Water Zones in Coastal Aquifer. Ground Water 2023. [PMID: 37847079 DOI: 10.1111/gwat.13366] [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] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Revised: 09/26/2023] [Accepted: 10/09/2023] [Indexed: 10/18/2023]
Abstract
Coastal aquifers are complex systems governed by fresh-saline water interactions and ocean tidal effects. The vertical electrical conductivity (EC) and temperature (T) are general indicators for detecting the fresh-saline water interface (FSI) and sea water intrusion in groundwater wells located in coastal aquifers. In this method brief, we developed a cost-effective Arduino-based automatic-vertical profile monitoring system (A-VPMS) to continuously record vertical EC and T in groundwater wells, with the aim of testing its effectiveness in spatiotemporal monitoring of the FSI in a coastal aquifer located in eastern Korea. By analyzing the high-density EC and T data obtained by the A-VPMS, we evaluated the characteristics of the FSI, such as depth and spatial distribution. Our established EC and T data collection method using the A-VPMS proved to be efficient and reliable, providing an excellent tool for fine-scale temporal and spatial understanding of sea water intrusion. The results of this study demonstrate the potential of the A-VPMS for continuous monitoring of the FSI in coastal aquifers, which is crucial for sustainable management of groundwater resources.
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Affiliation(s)
- Woo-Hyun Jeon
- Groundwater Environment Research Center, Climate Change Response Division, Korea Institute of Geoscience and Mineral Resources, Daejeon, 34132, Republic of Korea
| | - Hee Sun Moon
- Groundwater Environment Research Center, Climate Change Response Division, Korea Institute of Geoscience and Mineral Resources, Daejeon, 34132, Republic of Korea
| | - Jungwon Choi
- Department of Geology, College of Natural Sciences, Kangwon National University, Chuncheon, 24341, Republic of Korea
| | - Byeongju Jung
- Groundwater Environment Research Center, Climate Change Response Division, Korea Institute of Geoscience and Mineral Resources, Daejeon, 34132, Republic of Korea
| | - Yongcheol Kim
- Groundwater Environment Research Center, Climate Change Response Division, Korea Institute of Geoscience and Mineral Resources, Daejeon, 34132, Republic of Korea
| | - Seho Hwang
- Groundwater Environment Research Center, Climate Change Response Division, Korea Institute of Geoscience and Mineral Resources, Daejeon, 34132, Republic of Korea
| | - Soo-Hyoung Lee
- Groundwater Environment Research Center, Climate Change Response Division, Korea Institute of Geoscience and Mineral Resources, Daejeon, 34132, Republic of Korea
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Cha DC, Singh TI, Maibam A, Kim TH, Nam DH, Babarao R, Lee S. Metal-Organic Framework-Derived Mesoporous B-Doped CoO/Co@N-Doped Carbon Hybrid 3D Heterostructured Interfaces with Modulated Cobalt Oxidation States for Alkaline Water Splitting. Small 2023; 19:e2301405. [PMID: 37165605 DOI: 10.1002/smll.202301405] [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] [Subscribe] [Scholar Register] [Received: 02/16/2023] [Revised: 04/28/2023] [Indexed: 05/12/2023]
Abstract
Heteroatom-doped transition metal-oxides of high oxygen evolution reaction (OER) activities interfaced with metals of low hydrogen adsorption energy barrier for efficient hydrogen evolution reaction (HER) when uniformly embedded in a conductive nitrogen-doped carbon (NC) matrix, can mitigate the low-conductivity and high-agglomeration of metal-nanoparticles in carbon matrix and enhances their bifunctional activities. Thus, a 3D mesoporous heterostructure of boron (B)-doped cobalt-oxide/cobalt-metal nanohybrids embedded in NC and grown on a Ni foam substrate (B-CoO/Co@NC/NF) is developed as a binder-free bifunctional electrocatalyst for alkaline water-splitting via a post-synthetic modification of the metal-organic framework and subsequent annealing in different Ar/H2 gas ratios. B-CoO/Co@NC/NF prepared using 10% H2 gas (B-CoO/Co@NC/NF [10% H2 ]) shows the lowest HER overpotential (196 mV) and B-CoO/Co@NC/NF (Ar), developed in Ar, shows an OER overpotential of 307 mV at 10 mA cm-2 with excellent long-term durability for 100 h. The best anode and cathode electrocatalyst-based electrolyzer (B-CoO/Co@NC/NF (Ar)(+)//B-CoO/Co@NC/NF (10% H2 )(-)) generates a current density of 10 mA cm-2 with only 1.62 V with long-term stability. Further, density functional theory investigations demonstrate the effect of B-doping on electronic structure and reaction mechanism of the electrocatalysts for optimal interaction with reaction intermediates for efficient alkaline water-splitting which corroborates the experimental results.
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Affiliation(s)
- Dun Chan Cha
- Center for Bionano Intelligence Education and Research, Hanyang University ERICA, Ansan, 15588, Republic of Korea
- Department of Applied Chemistry, Hanyang University ERICA, Ansan, 15588, Republic of Korea
| | - Thangjam Ibomcha Singh
- Center for Bionano Intelligence Education and Research, Hanyang University ERICA, Ansan, 15588, Republic of Korea
- Department of Chemical and Molecular Engineering, Hanyang University ERICA, Ansan, 15588, Republic of Korea
- Department of Physics, Manipur University, Canchipur, Manipur, 795003, India
| | - Ashakiran Maibam
- School of Science, RMIT University, Melbourne, Victoria, 3001, Australia
- Physical and Materials Chemistry Division, CSIR-National Chemical Laboratory, Pune, 411 008, India
- Academy of Scientific and Innovative Research, CSIR-Human Resource Development Centre (CSIR-HRDC) Campus, Postal Staff College Area, Ghaziabad, Uttar Pradesh, 201002, India
| | - Tae Hyeong Kim
- Center for Bionano Intelligence Education and Research, Hanyang University ERICA, Ansan, 15588, Republic of Korea
- Department of Applied Chemistry, Hanyang University ERICA, Ansan, 15588, Republic of Korea
| | - Dong Hwan Nam
- Center for Bionano Intelligence Education and Research, Hanyang University ERICA, Ansan, 15588, Republic of Korea
- Department of Applied Chemistry, Hanyang University ERICA, Ansan, 15588, Republic of Korea
| | - Ravichandar Babarao
- School of Science, RMIT University, Melbourne, Victoria, 3001, Australia
- Manufacturing, CSIRO, Normanby Road, Clayton, Victoria, 3168, Australia
| | - Seunghyun Lee
- Center for Bionano Intelligence Education and Research, Hanyang University ERICA, Ansan, 15588, Republic of Korea
- Department of Applied Chemistry, Hanyang University ERICA, Ansan, 15588, Republic of Korea
- Department of Chemical and Molecular Engineering, Hanyang University ERICA, Ansan, 15588, Republic of Korea
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11
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Kim MS, Park EJ. Composition and variability of core phyllosphere fungal mycobiota on field-grown broccoli. Environ Microbiome 2023; 18:15. [PMID: 36855218 PMCID: PMC9976476 DOI: 10.1186/s40793-023-00474-0] [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] [Figures] [Subscribe] [Scholar Register] [Received: 11/15/2022] [Accepted: 02/24/2023] [Indexed: 06/18/2023]
Abstract
BACKGROUND Fresh vegetables harbor an assemblage of different microorganisms on their surfaces. The phyllosphere microbiota is important for maintaining plant health and managing crop quality before and after harvest. However, the diversity and ecology of fungal communities are largely unexplored in fresh vegetables. This study investigated the phyllosphere mycobiota of field-grown broccoli florets (n = 66) collected from 22 farms across four regions in Korea, using culturing, amplicon sequencing of the internal transcribed spacer region, and microbial network analysis. RESULTS Microbial network analysis identified core genera (Purpureocillium, Filobasidium, Cystofilobasidium, Papiliotrema, Aureobasidium, and unclassified genera of Capnodiales) specific to the broccoli phyllosphere. The composition and network complexity of core and unique populations varied among farming regions, and was associated with local agro-meteorological conditions. The complexity of microbial associations was higher in mature communities than in immature communities, but complexity was lost upon development of plant pathogenic disease. Broccoli mycobiota were classified according to the dominance of Purpurecillium. While Purpurecillium-type microbiota were prevalent in normal samples, Filobasidium-type microbiota were frequently observed in immature, damaged, or postharvest samples. CONCLUSIONS Together, fungal communities were important components of phyllosphere microbiota on fresh vegetables, and have substantial potential for exploitation to enhance and stabilize plant health and growth.
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Affiliation(s)
- Min-Soo Kim
- Department of Microbiology and Molecular Biology, Chungnam National University, 99 Daehak-ro, Yuseon-gu, Daejeon, 34134, Republic of Korea.
| | - Eun-Jin Park
- Department of Food Bioengineering, Jeju National University, 102 Jejudaehak-ro, Jeju, 63243, Republic of Korea.
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12
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Park S, Lim SY, Kim JY, Park H, Lim JS, Bae S, Kim J, Jung J, Kim MJ, Chong YP, Choi SH, Lee SO, Kim YS, Park MS, Kim SH. Clinical and virological characteristics of SARS-CoV-2 B.1.617.2 (Delta) variant: a prospective cohort study. Clin Infect Dis 2022; 75:e27-e34. [PMID: 35362530 PMCID: PMC9047158 DOI: 10.1093/cid/ciac239] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2021] [Indexed: 12/19/2022] Open
Abstract
Background Data on the clinical and virological characteristics of the Delta variant of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) are limited. This prospective cohort study compared the characteristics of the Delta variant to other variants. Methods Adult patients with mild coronavirus disease 2019 (COVID-19) who agreed to daily saliva sampling at a community isolation facility in South Korea between July and August 2021 were enrolled. Scores of 28 COVID-19-related symptoms were recorded daily. The genomic RNA and subgenomic RNA from saliva samples were measured by real-time reverse-transcription polymerase chain reaction (PCR). Cell cultures were performed on saliva samples with positive genomic RNA results. Results A total of 141 patients (Delta group, n = 108 [77%]; non-Delta group, n = 33 [23%]) were enrolled. Myalgia was more common in the Delta group than in the non-Delta group (52% vs 27%, P = .03). Total symptom scores were significantly higher in the Delta group between days 3 and 10 after symptom onset. Initial genomic RNA titers were similar between the 2 groups; however, during the late course of disease, genomic RNA titers were higher in the Delta group. Negative conversion of subgenomic RNA was slower in the Delta group (median 9 vs 5 days; P < .001). The duration of viral shedding in terms of positive viral culture was also longer in the Delta group (median 5 vs 3 days; P = .002). Conclusions COVID-19 patients infected with the Delta variant exhibited prolonged viable viral shedding with more severe symptoms than those infected with non-Delta variants.
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Affiliation(s)
| | | | | | | | - Joon Seo Lim
- Clinical Research Center, Asan Institute for Life Sciences, Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea
| | - Seongman Bae
- Department of Infectious Diseases, Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea
| | - Jeonghun Kim
- BK21 Graduate Program, Department of Biomedical Sciences, Korea University College of Medicine, Seoul, Republic of Korea
- Department of Microbiology, Institute for Viral Diseases, Biosafety Center, College of Medicine, Korea University, Seoul, South Korea
| | - Jiwon Jung
- Department of Infectious Diseases, Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea
| | - Min Jae Kim
- Department of Infectious Diseases, Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea
| | - Yong Pil Chong
- Department of Infectious Diseases, Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea
| | - Sang-Ho Choi
- Department of Infectious Diseases, Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea
| | - Sang-Oh Lee
- Department of Infectious Diseases, Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea
| | - Yang Soo Kim
- Department of Infectious Diseases, Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea
| | | | - Sung-Han Kim
- Correspondence: S.-H. Kim, Department of Infectious Diseases, Asan Medical Center, University of Ulsan College of Medicine, 88, Olympic-ro-43-gil, Songpa-gu, Seoul, 05505, South Korea ()
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13
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Cha H, Kwon O, Kim J, Choi H, Yoo H, Kim H, Park T. Effects of the Anode Diffusion Layer on the Performance of a Nonenzymatic Electrochemical Glucose Fuel Cell with a Proton Exchange Membrane. ACS Omega 2021; 6:34752-34762. [PMID: 34963958 PMCID: PMC8697377 DOI: 10.1021/acsomega.1c05199] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/19/2021] [Accepted: 11/26/2021] [Indexed: 06/14/2023]
Abstract
It is necessary to apply a nonenzymatic glucose fuel cell using a proton exchange membrane for an implantable biomedical device that operates at low power. The permeability of glucose with high viscosity and a large molecular weight in the porous medium of the diffusion layer was investigated for use in fuel cells. Carbon paper was prepared as an anode diffusion layer, and it was analyzed with a diffusion layer treated with polytetrafluoroethylene (PTFE) and a microporous layer (MPL). When untreated carbon paper was applied, the peak power density (PPD) and open-circuit voltage (OCV) increased as the glucose concentration and flow rate increased. On this occasion, the highest PPD of 17.81 μW cm-2 was achieved at 3 mM and a 2.0 mL min-1 glucose aqueous solution (at atmospheric pressure and 36.5 °C). The diffusion layer, which became more hydrophobic through PTFE treatment, adversely affected glucose permeability. In addition, the addition of an MPL decreased OCV and PPD with increasing glucose concentrations and flow rates. Compared with untreated carbon paper, the PPD was six times lower approximately. Consequently, it was confirmed that the properties of carbon paper, such as low hydrophobicity, high porosity, and thin thickness, would be advantageous for nonenzymatic glucose fuel cells.
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14
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Choi H, Choi Y, Yim HY, Mirzaaghasi A, Yoo JK, Choi C. Biodistribution of Exosomes and Engineering Strategies for Targeted Delivery of Therapeutic Exosomes. Tissue Eng Regen Med 2021; 18:499-511. [PMID: 34260047 PMCID: PMC8325750 DOI: 10.1007/s13770-021-00361-0] [Citation(s) in RCA: 73] [Impact Index Per Article: 24.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Revised: 06/03/2021] [Accepted: 06/09/2021] [Indexed: 02/06/2023] Open
Abstract
Exosomes are cell-secreted nano-sized vesicles which deliver diverse biological molecules for intercellular communication. Due to their therapeutic potential, exosomes have been engineered in numerous ways for efficient delivery of active pharmaceutical ingredients to various target organs, tissues, and cells. In vivo administered exosomes are normally delivered to the liver, spleen, kidney, lung, and gastrointestinal tract and show rapid clearance from the blood circulation after systemic injection. The biodistribution and pharmacokinetics (PK) of exosomes can be modulated by engineering various factors such as cellular origin and membrane protein composition of exosomes. Recent advances accentuate the potential of targeted delivery of engineered exosomes even to the most challenging organs including the central nervous system. Major breakthroughs have been made related to various imaging techniques for monitoring in vivo biodistribution and PK of exosomes, as well as exosomal surface engineering technologies for inducing targetability. For inducing targeted delivery, therapeutic exosomes can be engineered to express various targeting moieties via direct modification methods such as chemically modifying exosomal surfaces with covalent/non-covalent bonds, or via indirect modification methods by genetically engineering exosome-producing cells. In this review, we describe the current knowledge of biodistribution and PK of exosomes, factors determining the targetability and organotropism of exosomes, and imaging technologies to monitor in vivo administered exosomes. In addition, we highlight recent advances in strategies for inducing targeted delivery of exosomes to specific organs and cells.
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Affiliation(s)
- Hojun Choi
- ILIAS Biologics Incorporated, 40-20, Techno 6-ro, Yuseong-gu, Daejeon, 34014, Republic of Korea
| | - Yoorim Choi
- ILIAS Biologics Incorporated, 40-20, Techno 6-ro, Yuseong-gu, Daejeon, 34014, Republic of Korea
| | - Hwa Young Yim
- ILIAS Biologics Incorporated, 40-20, Techno 6-ro, Yuseong-gu, Daejeon, 34014, Republic of Korea
| | - Amin Mirzaaghasi
- Department of Bio and Brain Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea
| | - Jae-Kwang Yoo
- ILIAS Biologics Incorporated, 40-20, Techno 6-ro, Yuseong-gu, Daejeon, 34014, Republic of Korea.
| | - Chulhee Choi
- ILIAS Biologics Incorporated, 40-20, Techno 6-ro, Yuseong-gu, Daejeon, 34014, Republic of Korea.
- Department of Bio and Brain Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea.
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15
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Jo S, Jun DB, Park S. Impact of differential copayment on patient healthcare choice: evidence from South Korean National Cohort Study. BMJ Open 2021; 11:e044549. [PMID: 34162638 PMCID: PMC8231052 DOI: 10.1136/bmjopen-2020-044549] [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] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
OBJECTIVE We evaluate the effectiveness of mild disease differential copayment policy aimed at reducing unnecessary patient visits to secondary/tertiary healthcare institutions in South Korea. DESIGN Retrospective study using difference-in-difference design. SETTING Sample Research database provided by the Korean National Health Insurance Service, between 2010 and 2013. PARTICIPANTS 206 947 patients who visited healthcare institutions to treat mild diseases during the sample period. METHODS A linear probability model with difference-in-difference approach was adopted to estimate the changes in patients' healthcare choices associated with the differential copayment policy. The dependent variable was a binary variable denoting whether a patient visited primary healthcare or secondary/tertiary healthcare to treat her/his mild disease. Patients' individual characteristics were controlled with a fixed effect. RESULTS We observed significant decrease in the proportion of patients choosing secondary/tertiary healthcare over primary healthcare by 2.99 per cent point. The decrease associated with the policy was smaller by 14% in the low-income group compared with richer population, greater by 19% among the residents of Seoul metropolitan area than among people living elsewhere, and greater among frequent healthcare visitors by 33% than among people who less frequently visit healthcare. CONCLUSION The mild disease differential copayment policy of South Korea was successful in discouraging unnecessary visits to secondary/tertiary healthcare institutions to treat mild diseases that can be treated well in primary healthcare.
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Affiliation(s)
- Sangkyun Jo
- College of Business, KAIST, Seoul, South Korea
| | - Duk Bin Jun
- College of Business, KAIST, Seoul, South Korea
| | - Sungho Park
- SNU Business School, Seoul National University, Seoul, South Korea
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Jung J, Choi IC. A multi-commodity network model for optimal quantum reversible circuit synthesis. PLoS One 2021; 16:e0253140. [PMID: 34157035 PMCID: PMC8219173 DOI: 10.1371/journal.pone.0253140] [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] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2021] [Accepted: 06/01/2021] [Indexed: 12/04/2022] Open
Abstract
Quantum computing is a newly emerging computing environment that has recently attracted intense research interest in improving the output fidelity, fully utilizing its high computing power from both hardware and software perspectives. In particular, several attempts have been made to reduce the errors in quantum computing algorithms through the efficient synthesis of quantum circuits. In this study, we present an application of an optimization model for synthesizing quantum circuits with minimum implementation costs to lower the error rates by forming a simpler circuit. Our model has a unique structure that combines the arc-subset selection problem with a conventional multi-commodity network flow model. The model targets the circuit synthesis with multiple control Toffoli gates to implement Boolean reversible functions that are often used as a key component in many quantum algorithms. Compared to previous studies, the proposed model has a unifying yet straightforward structure for exploiting the operational characteristics of quantum gates. Our computational experiment shows the potential of the proposed model, obtaining quantum circuits with significantly lower quantum costs compared to prior studies. The proposed model is also applicable to various other fields where reversible logic is utilized, such as low-power computing, fault-tolerant designs, and DNA computing. In addition, our model can be applied to network-based problems, such as logistics distribution and time-stage network problems.
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Affiliation(s)
- Jihye Jung
- Quantum Machine Learning Laboratory, School of Industrial Management Engineering, Korea University, Seoul, Republic of Korea
| | - In-Chan Choi
- Quantum Machine Learning Laboratory, School of Industrial Management Engineering, Korea University, Seoul, Republic of Korea
- * E-mail:
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Wang C, Kim Y, Shin H, Min SD. Preliminary Clinical Application of Textile Insole Sensor for Hemiparetic Gait Pattern Analysis. Sensors (Basel) 2019; 19:E3950. [PMID: 31547437 PMCID: PMC6767662 DOI: 10.3390/s19183950] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [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: 08/02/2019] [Revised: 09/02/2019] [Accepted: 09/10/2019] [Indexed: 11/24/2022]
Abstract
Post-stroke gait dysfunction occurs at a very high prevalence. A practical method to quantitatively analyze the characteristics of hemiparetic gait is needed in both clinical and community settings. This study developed a 10-channeled textile capacitive pressure sensing insole (TCPSI) with a real-time monitoring system and tested its performance through hemiparetic gait pattern analysis. Thirty-five subjects (18 hemiparetic, 17 healthy) walked down a 40-m long corridor at a comfortable speed while wearing TCPSI inside the shoe. For gait analysis, the percentage of the plantar pressure difference (PPD), the step count, the stride time, the coefficient of variation, and the phase coordination index (PCI) were used. The results of the stroke patients showed a threefold higher PPD, a higher step count (41.61 ± 10.7), a longer average stride time on the affected side, a lower mean plantar pressure on the affected side, higher plantar pressure in the toe area and the lateral side of the foot, and a threefold higher PCI (hemi: 19.50 ± 13.86%, healthy: 5.62 ± 5.05%) compared to healthy subjects. This study confirmed that TCPSI is a promising tool for distinguishing hemiparetic gait patterns and thus may be used as a wearable gait function evaluation tool, the external feedback gait training device, and a simple gait pattern analyzer for both hemiparetic patients and healthy individuals.
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Affiliation(s)
- Changwon Wang
- Department of Medical IT Engineering, Soonchunhyang University, Asan 31538, Korea
- Department of Computer Science, Soonchunhyang University, Asan 31538, Korea
| | - Young Kim
- Wellness Coaching Service Research Center, Soonchunhyang University, Asan 31538, Korea
| | - Hangsik Shin
- Department of Biomedical Engineering, Chonnam National University, Yeosu 59626, Korea
| | - Se Dong Min
- Department of Medical IT Engineering, Soonchunhyang University, Asan 31538, Korea.
- Department of Computer Science, Soonchunhyang University, Asan 31538, Korea.
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