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Machine-learned wearable sensors for real-time hand-motion recognition: toward practical applications

National Science Review 2024年第2期11卷 231-263页

作者： Kyung Rok Pyun Kangkyu kwon Myung Jin yoo Kyun Kyu Kim Dohyeon Gong Woon-Hong Yeo Seungyong Han Seung Hwan Ko Department of Mechanical Engineering Seoul National University IEN Center for Human-Centric Interfaces and Engineering Institute for Electronics and NanotechnologyGeorgia Institute of Technology School of Electrical and Computer Engineering Georgia Institute of Technology Department of Chemical Engineering Stanford University Department of Mechanical Engineering Ajou University George W.Woodruff School of Mechanical Engineering Georgia Institute of Technology Institute of Advanced Machinery and Design(SNU-IAMD) Seoul National University

Soft electromechanical sensors have led to a new paradigm of electronic devices for novel motion-based wearable applications in our daily lives. However, the vast amount of random and unidentified signals generated by complex body motions has hindered the precise recognition and practical application of this technology. Recent advancements in artificial-intelligence technology have enabled significant strides in extracting features from massive and intricate data sets, thereby presenting a breakthrough in utilizing wearable sensors for practical applications. Beyond traditional machine-learning techniques for classifying simple gestures, advanced machine-learning algorithms have been developed to handle more complex and nuanced motion-based tasks with restricted training data sets. Machine-learning techniques have improved the ability to perceive, and thus machine-learned wearable soft sensors have enabled accurate and rapid human-gesture recognition, providing real-time feedback to users. This forms a crucial component of future wearable electronics, contributing to a robust human–machine interface. In this review, we provide a comprehensive summary covering materials, structures and machine-learning algorithms for hand-gesture recognition and possible practical applications through machine-learned wearable electromechanical sensors.

关键词： wearable sensor soft electronics artificial intelligence machine learning human–machine interfaces gesture recognition

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Ischemic colitis during interferon-ribavirin therapy for chronic hepatitis C:A case report

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世界胃肠病学杂志：英文版 2012年第31期18卷 4233-4236页

作者： Su Jung Baik Tae Hun Kim kwon yoo Il Hwan Moon Min-Sun Cho Department of Gastroenterology Health Promotion CenterYonsei University Gangnam Severance HospitalSeoul 158-050South Korea Department of Internal Medicine Ewha Medical Research InstituteEwha University Mokdong HospitalEwha Womans University School of MedicineSeoul 158-710South Korea Department of Pathology Ewha University Mokdong HospitalEwha Womans University School of MedicineSeoul 158-710South Korea

Ischemic colitis is a rare complication of interferon *** 9 cases in 6 reports have been described *** report describes a case of ischemic colitis during pegylated interferon and ribavirin treatment for chronic hepatitis C,and includes a review of the relevant literature.A 48-year-old woman was treated with pegylated interferon-2a and ribavirin for chronic hepatitis C,genotype *** 19 wk of treatment,the patient complained of severe afebrile abdominal pain with *** signs were stable and serum white blood cell count was within the normal *** computed tomography showed diffuse colonic wall thickening from the splenic flexure to the proximal sigmoid colon,which is the most vulnerable area for the development of ischemic *** revealed an acute mucosal hyperemic change,with edema and ulcerations extending from the proximal descending colon to the sigmoid *** mucosal biopsy revealed acute exudative *** chain reaction and culture for Mycobacterium tuberculosis were negative and the cultures for cytomegalovirus,Salmonella and Shigella species were *** discontinuation of interferon and ribavirin therapy,abdominal pain and hematochezia subsided and,following colonoscopy showed improvement of the mucosal *** colitis cases during interferon therapy in patients with chronic hepatitis C reported so far have all involved the descending *** colitis is a rarely encountered complication of interferon administration in patients with chronic hepatitis C and should be considered when a patient complains of abdominal pain and hematochezia.

关键词：干扰素α 丙型肝炎利巴韦林结肠炎治疗缺血慢性病例报告

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水坝的抗震设计准则与抗震性能评估

水坝的抗震设计准则与抗震性能评估

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水库大坝高质量建设与绿色发展——中国大坝工程学会201...

作者： Jin-kwon yoo Seon-Uk Kim Byung-Dong Oh Seung In Yang 韩国水资源公社（K-water）业务维护部

地震引起的水坝损坏将对社会造成巨大损失。因此,应该进行大坝及相关附属设施的抗震性能评估和维护,以保护人民的生命和财产。在韩国,随着2017年修订的抗震设计准则的发布,水坝的抗震设计准则也在修订中,以反映修订的抗震设计准则的变... 详细信息

地震引起的水坝损坏将对社会造成巨大损失。因此,应该进行大坝及相关附属设施的抗震性能评估和维护,以保护人民的生命和财产。在韩国,随着2017年修订的抗震设计准则的发布,水坝的抗震设计准则也在修订中,以反映修订的抗震设计准则的变更。根据韩国水资源公社对水坝及其附属设施进行抗震性能评估的经验和结果,本文详细讨论了2011年发布的现行水坝的抗震设计准则存在的问题及后续的问题。此外,本文还介绍了韩国水资源公社经营的水坝及其附属设施的抗震性能评估现状。

关键词：抗震设计准则水坝设计准则抗震性能评估水坝设施

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Boosting overall water splitting by incorporating sulfur into NiFe(oxy)hydroxide

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Journal of Energy Chemistry 2022年第1期31卷 364-371,I0010页

作者： Chiho Kim Seong Hyun Kim Seunghun Lee Ilyeong kwon Seong Hyun Kim Shinho kim Changgyu Seok yoo Sei Park Yangdo Kim Department of Materials Science and Engineering Pusan National UniversityBusan 46241Republic of Korea BK21 Four Innovative Graduate Education Program for Global High-tech Materials&PartsPusan National UniversityBusan 46241Republic of Korea Department of Materials Science and Engineering Pohang University of Science and Technology(POSTECH).Pohang 37673Republic of Korea

Developing highly active and cost-effective electrocatalysts for enhancing the hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)is a significant challenge for overall water ***-incorporated nickel iron(oxy)hydroxide(S-NiFeOOH)nanosheets were directly grown on commercial nickel foam using a galvanic corrosion method and a hydrothermal *** incorporation of sulfur into NiFeOOH enhanced the catalytic activity for the HER and OER in 1 M KOH *** enhanced catalytic activity is attributed to the change in the local structure and chemical states due to the incorporation of *** performance for overall water splitting was achieved with an alkaline water *** was realized by employing S-NiFeOOH as a bifunctional electrocatalyst,thereby outperforming a water electrolyzer that requires the usage of precious metal electrocatalysts(i.e.,Pt/C as the HER electrocatalyst and IrO_(2) as the OER electrocatalyst).Moreover,when driven by a commercial silicon solar cell,an alkaline water electrolyzer that uses S-NiFeOOH as a bifunctional electrocatalyst generated hydrogen under natural *** study shows that S-NiFeOOH is a promising candidate for a large-scale industrial implementation of hydrogen production for overall water splitting because of its low cost,high activity,and *** addition,the solar-driven water electrolyzer using S-NiFeOOH as a bifunctional electrocatalyst affords the opportunity for developing effective and feasible solar power systems in the future.

关键词： Overall water splitting Hydrogen production Sulfur incorporated NiFe(oxy)hydroxide Electrocatalysts Solar-driven water splitting

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Ternary layered double hydroxide oxygen evolution reaction electrocatalyst for anion exchange membrane alkaline seawater electrolysis

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Journal of Energy Chemistry 2022年第12期75卷 127-134,I0004页

作者： yoo Sei Park Jae-Yeop Jeong Myeong Je Jang Chae-Yeon kwon Geul Han Kim Jaehoon Jeong Ji-hoon Lee Jooyoung Lee Sung Mook Choi Department of Hydrogen Energy Materials Surface&Nano Materials DivisionKorea Institute of Materials Science(KIMS)Changwon 51508Republic of Korea Department of Advanced Material Engineering Chungbuk National University1 Chungdae-roSeowon-guCheongjuChungbuk 28644Republic of Korea Department of Chemical Engineering University of WaterlooWaterlooOntario N2L 3G1 Canada School of Materials Science and Engineering Gyeongsang National UniversityJinju 52828Republic of Korea Department of Materials Science and Engineering Pusan National UniversityBusan 46241Republic of Korea Energy Industry Support Center Daegu Mechatronics&Materials InstituteDaegu 42704Republic of Korea Advanced Materials Engineering University of Science and Technology(UST)Yuseong-guDaejeon 34113Republic of Korea

Anion exchange membrane(AEM)water electrolyzers are promising energy devices for the production of clean hydrogen from ***,the lack of active and robust electrocatalysts for the oxygen evolution reaction(OER)severely impedes the development of this *** this study,a ternary layered double hydroxide(LDH)OER electrocatalyst(NiFeCo-LDH)is developed for high-performance AEM alkaline seawater *** AEM alkaline seawater electrolyzer catalyzed by the NiFeCo LDH shows high seawater electrolysis performance(0.84 A/cm^(2)at 1.7 Vcell)and high hydrogen production efficiency(77.6%at 0.5 A/cm^(2)),thus outperforming an electrolyzer catalyzed by a benchmark IrO_(2)*** NiFeCo-LDH electrocatalyst greatly improves the kinetics of the AEM alkaline seawater electrolyzer,consequently reducing its activation loss and leading to high *** on the results,this NiFeCo-LDH-catalyzed AEM alkaline seawater electrolyzer can likely surpass the energy conversion targets of the US Department of Energy.

关键词： Anion exchange membranes water electrolysis Oxygen evolution reactions Alkaline seawater electrolysis Hydrogen production

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Slip-enhanced Reverse Electrodialytic Power Generation in Ion-selective Nanochannels

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Journal of Thermal Science 2013年第1期22卷 36-41页

作者： Byeongdong Kang Jaisuk yoo Hyun Jung Kim Dong-kwon Kim Department of Mechanical Engineering Ajou University

Power generation by reverse electrodialysis in ion-selective nanochannels is numerically investigated. Especially,in the present study, the influence of hydrodynamic slip at the surface of nanochannels is investigated. The current-potential characteristics of the nanochannels are calculated by solving several governing equations:Nernst-Planck equation for the ionic concentrations, the Poisson equation for the electric potential, and the Navier-Stokes equation for the diffusioosmotic flow. Hydrodynamic slip is applied as the boundary condition at the surface of nanochannels. As the slip length increases, the diffusioosmotic flow velocity and electrical conductance of ions increase because the friction at the surface of nanochannels decreases. It is shown that the power generation is enhanced by 44% with a moderate 100nm slip length by using a nanochannel with 10nm height.

关键词：离子选择性纳米通道电渗析 Navier-Stokes方程发电控制方程渗透流速数值模拟

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Inhibitory Mechanisms of Water Extract of Oplopanax elatus on Lipopolysaccharide-lnduced Inflammatory Responses in RAW 264.7 Murine Macrophage Cells

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Chinese Journal of Integrative Medicine 2020年第9期26卷 670-676页

作者： Ki Sun kwon Hyun Lim Yong Soo kwon Myong Jo Kim Ji Hye yoo Nam Ho yoo Hyun Pyo Kim College of Pharmacy Kangwon National UniversityChuncheon(24341)Republic of Korea Department of Bio-Resource Sciences Kangwon National UniversityChuncheon(24341)Republic of Korea Bioherb Research Institute Kangwon National UniversityChuncheon(24341)Republic of Korea

Objective:To study the anti-inflammatory action and cellular mechanism of Oplopanax ***:A hot water extract of OE(WOE)was prepared and a major constituent,syringin,was successfully *** content in WOE was found to be 214.0 p.g/g dried plant(w/w).Their anti-inflammatory activities were examined using RAW 264.7 macrophages and a mouse model of croton oil-induced ear ***:In lipopolysaccharide(LPS)-treated RAW 264.7 cells,a mouse macrophage cell line,WOE was found to significantly and strongly inhibit cyclooxygenase-2(COX-2)-induced prostaglandin E2(PGE2)production[half maximal inhibitory concentration(IC50)=135.2μg/mL]and inducible nitric oxide synthase(iNOS)-induced NO production(IC50=242.9μg/mL).In the same condition,WOE was revealed to inhibit NO production by downregulating iNOS expression,mainly by interrupting mitogen activated protein kinases(MAPKs)/activator protein-1(AP-1)*** activation of all three major MAPKs,p38 MAPK,extracellular signal-regulated kinase(ERK),and c-Jun N-terminal kinase,was inhibited by WOE(50-300μg/mL).On the other hand,WOE reduced PGE2 production by inhibiting COX-2 enzyme activity,but did not affect COX-2 expression *** addition,WOE inhibited the production of proinflammatory cytokines such as interleukin-6 and tumor necrosis factor-α.In croton oil-induced ear edema in mice,oral administration of WOE(50-300 mg/kg)dose-dependently inhibited edematic ***:Water extract of OE exhibited multiple anti-inflammatory action mechanisms and may have potential for treating inflammatory disorders.

关键词： Oplopanax elatus Chinese medicine stem syringin anti-inflammation RAW 264.7

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Cell-type continuous electromagnetic radiation system generating millimeter waves for active denial system applications

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Defence Technology（防务技术） 2022年第10期18卷 1895-1913页

作者： Sun-Hong Min Ohjoon kwon Matlabjon Sattorov Seontae Kim In-Keun Baek Seunghyuk Park Ranjan Kumar Barik Anirban Bera Dongpyo Hong Seonmyeong Kim Bong Hwan Hong Chawon Park Sukhwal Ma Minho Kim Kyo Chul Lee Yong Jin Lee Han Byul kwon Young Joon yoo Sang yoon Park Gun-Sik Park Korea Institute of Radiological and Medical Sciences(KIRAMS) Seoul01812South Korea Institute for Basic Science Center for Axion and Precision Physics ResearchDaejeon34141South Korea Center for THz-Driven Biomedical Systems Department of Physics and AstronomyCollege of Natural SciencesSeoul National UniversitySeoul08826South Korea Center for Applied Electromagnetic Research Advanced Institute of Convergence TechnologySuwonGyeonggi-do16229South Korea R&D Department Seoul-TeracomInc.Suwon16229South Korea Mechatronics R&D Center Samsung Electronics Co.Ltd.Hwasung18448South Korea Hanwha Corporation Gumi730-030South Korea Council of Scientific and Industrial Research Central Electronics Engineering Research InstitutePilani333031India Home Economics Education/Biosystems and Biomedical Sciences Korea UniversitySeoul02841South Korea Current affiliation of Seontae Kim:Young IN ACE 1 F60Anyangcheondong-roDongan-guAnyang-siGyeonggi-do14042South Korea.

The cell-type continuous electromagnetic radiation system is a demonstration device capable of generating high-power millimeter electromagnetic waves of a specific wavelength and observing their effects on living *** irradiates a biological sample placed in a 30×30×50 cm^(3)cell with electromagnetic waves in the 3.15-mm-wavelength region(with an output of≥1 W)and analyzes the temperature change of the sample.A vacuum electronic device-based coupled-cavity backward-wave oscillator converts the electron energy of the electron beam into radiofrequency(RF)energy and radiates it to the target through an antenna,increasing the temperature through the absorption of RF energy in the *** system causes pain and ultimately reduces combat power.A cell-type continuous electromagnetic radiation system consisting of four parts—an electromagnetic-wave generator,a highvoltage power supply,a test cell,and a system controller—generates an RF signal of≥1 W in a continuous waveform at a 95-GHz center frequency,as well as a chemical solution with a dielectric constant similar to that of the skin of a living *** increase of 5°C lasting approximately 10 s was confirmed through an experiment.

关键词： Millimeter waves Terahertz waves Coupled-cavity backward wave oscillator(CCBWO) Cell-type continuous electromagnetic radiation Active denial system(ADS) Directed-energy weapon(DEW)

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Enhancement of magnetic properties of hot pressed/die-upset Dy-free Nd-Fe-B magnets with Cu/Nd coating by wet process

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Rare Metals 2020年第1期39卷 48-54页

作者： Jeehye kwon Dajeong Lee Dayoung yoo Seongkyu Park Hee-Ryoung Cha Hae-Woong kwon Junggoo Lee Dongyun Lee Department of Advanced Circuit Interconnection Pusan National UniversityBusan46241Republic of Korea Department of Nano Fusion Technology Pusan National UniversityBusan46241Republic of Korea Powder and Ceramics Department Korea Institute of Machinery and MaterialsChangwon51508Republic of Korea Department of Materials Science and Engineering Pukyong National UniversityBusan48513Republic of Korea Department of Nanoenergy Engineering Pusan National UniversityBusan46241Republic of Korea

A grain boundary diffusion process(GBDP)was adopted to improve magnetic properties of Dy-free highly coercive Nd-Fe-B permanent magnet by coating thin layers of Nd and Cu in grain *** GBDP of Nd and Cu,Nd and Cu were coated by wet process,e.g.,electrochemical and electroless on Nd-Fe-B magnets,which was fabricated by hot-deformed/die-upset with meltspun *** treatment was performed for 20 min at 600℃followed by several different cooling *** cooling conditions after heat treatment were varied to understand distribution and micros tructural effects of Nd and Cu species in grain *** coercivity increased from 1.565 to 1.637 T in oil cooling rate but remanence decreased,while remanence jumped with little decrease in coercivity in furnace *** tructure analyses suggested that the coercivity was closely related to the cooling rate as well as distribution of *** mechanism of coercivity enhancement due to the cooling rate was discussed based on the results presented here and those in the literature.

关键词： Magnetic materials Electrochemical deposition Diffusion Scanning electron microscopy Coercivity

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The interplay between direct-acting antivirals and hepatocellular carcinoma in chronic hepatitis C

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Hepatoma Research 2020年第3期6卷 15-23页

作者： Sun Hong yoo Jung Hyun kwon Department of Internal Medicine Catholic University Liver Research CenterThe Catholic University of KoreaSeoul 06591Korea

Direct-acting antivirals(DAAs)have been introduced for the treatment of hepatitis C virus,and the sustained virological response rate after DAAs was reported to be over 95%.Because of the high sustained virological response rate,the risk of hepatocellular carcinoma(HCC)was expected to be ***,an unexpected high risk of HCC recurrence after DAA treatment was reported,and thus the dispute about the association of DAA and HCC *** present article reviews the interplay between DAAs and HCC.

关键词： Chronic hepatitis C hepatocellular carcinoma direct-acting antivirals

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