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中国有色金属学会会刊：英文版 2009年第B9期19卷 45-49页

作者： Masazumi OKIDO Ryoichi ICHINO Seok-Ki jang Seong-jong KIM Graduate School of Engineering Nagoya University Division of Marine Engineering Mokpo Maritime University

The corrosion protection property and morphology of colloidal silica conversion films as an alternative to chemical conversion coating(CCC) films were examined. The corrosion behavior was investigated in 3% NaCl solution using electrochemical techniques. Corrosion was implied by the appearance of red rust on the specimen surface. The results show that in 3% NaCl solution, red rust appears at 15-20, 55-70, and 75-85 d on Zn-electroplated steel, colloidal silica conversion-coated specimens, and chemical conversion-coated, specimens, respectively. In the salt spray test, the colloidal silica film provides better corrosion protection than CCC film, i.e., red rust appears at 96 h on the Zn-electroplated steel sheet, at 432 h on the CCC films, and at 888 h on silica conversion coating.

关键词：化学转化膜电镀钢板表面形貌电化学特性 3%NaCl溶液胶体二氧化硅二氧化硅薄膜 CCC认证

Humidity-induced synaptic plasticity of ZnO artificial synapses using peptide insulator for neuromorphic computing

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Journal of Materials Science & Technology 2022年第24期119卷 150-155页

作者： Min-Kyu Song Hojung Lee Jeong Hyun Yoon Young-Woong Song Seok Daniel Namgung Taehoon Sung Yoon-sik Lee jong-Seok Lee Ki Tae Nam jang-Yeon Kwon School of Integrated Technology Yonsei UniversityIncheon 21983South Korea Department of Materials Science and Engineering Seoul National UniversitySeoul 08826South Korea Soft Foundry Seoul National UniversitySeoul 08826South Korea School of Chemical and Biological Engineering Seoul National UniversitySeoul 08826South Korea

Neuromorphic devices inspired by the human brain have attracted significant attention because of their excellent ability for cognitive and parallel *** study presents ZnO-based artificial synapses with peptide insulators for the electrical emulation of biological *** demonstrated the dynamic responses of the device under various environmental *** proton-conducting property of the tyrosine-rich peptide enables time-dependent responses under ambient conditions such that various aspects of synaptic behaviors are emulated by the *** transition from short-term memory to longterm memory is achieved via electrochemical doping of ZnO by ***,we demonstrate an image classification simulation using a multi-layer perceptron model to evaluate the potential of the device for use in neuromorphic *** neural network based on our device achieved a recognition accuracy of 87.47% for the MNIST handwritten digit *** work proposes a novel device platform inspired by biosystems for brain-mimetic hardware systems.

关键词： Artificial synapse Neuromorphic computing Oxide semiconductor Proton conductor Artificial neural network

Tyrosine-mediated analog resistive switching for artificial neural networks

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Nano Research 2023年第1期16卷 858-864页

作者： Min-Kyu Song Seok Daniel Namgung Hojung Lee Jeong Hyun Yoon Young-Woong Song Kang Hee Cho Yoon-sik Lee jong-Seok Lee Ki Tae Nam jang-Yeon Kwon School of Integrated Technology Yonsei UniversityIncheon 21983Republic of Korea Department of Mechanical Engineering Massachusetts Institute of TechnologyMA 02139USA Research Laboratory of Electronics Massachusetts Institute of TechnologyMA 02139USA Department of Materials Science and Engineering Seoul National UniversitySeoul 08826Republic of Korea Soft Foundry Seoul National UniversitySeoul 08826Republic of Korea School of Chemical and Biological Engineering Seoul National UniversitySeoul 08826Republic of Korea

The fourth industrial revolution indispensably brings explosive data processing and storage;thus,a new computing paradigm based on artificial intelligence-enabling device structure is urgently *** have received considerable attention in this regard because of their ability to process and store data at the same ***,fundamental problems with abrupt switching characteristics limit their practical *** address this problem,we utilized the concept of metaplasticity inspired by biosystems and observed gradual switching in the peptide-based memristor at high proton *** unexpectedly high slope value>1.7 in the logI–V curve at low voltage(≤400 mV)was considered the main origin,and it might arise from the modulatory response of proton ions on the threshold of Ag ion migration in the peptide *** the obtained gradual switching property at high proton conductivity,the device showed significantly increased accuracy of image recognition(~82.5%).We believe that such a demonstration not only contributes to the practical application of neuromorphic devices but also expands the bioinspired functional synthetic platform.

关键词： artificial synapse neuromorphic computing proton conductor peptide materials artificial neural network

Analysis of the effectiveness of cognitive rehabilitation for patients with chronic mental illness:A meta-analysis

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World Journal of Clinical Cases 2023年第32期11卷 7822-7832页

作者： jong-sik.jang Seri Oh Geonwoo Kim Narae Lee Hyesu Song Jihye Park Yushin Lee Minji Kim Mihwa Kwon Department of Occupational Therapy Kangwon National UniversitySamcheok 25949South Korea Department of Occupatioanl Therapy Kangwon National University Graduate SchoolSamcheok 25949South Korea Department of Occupational Therapy U1 UniversityChung-Cheong Bukdo 25949South Korea Department of Occupation Therapy Dongnam Health UniversityGyeonggi-do 16328South Korea

BACKGROUND People suffering from chronic mental illness are sensitive to stressful stimuli,lack coping skills,and have low self-esteem due to problems such as social *** also experience depression,isolation,fear,and *** to cognitive dysfunction,people suffering from chronic mental illness have inadequate cognitive processes that lead to distorted *** To confirm the effectiveness of cognitive rehabilitation therapy in improving cognitive function and alleviating behavioral and psychological symptoms in patients with chronic mental illness,and to identify the cognitive function that had the main *** The quality of the studies was evaluated using the Assessment of Multiple Systematic Reviews criteria,and data published from 2011 to December 2022 were searched using PubMed,Cochrane,RISS,KISS,and *** keywords used in the search were“mental illness,”“cognitive rehabilitation,”“cognition,”and“mental.”A meta-analysis was conducted on the 12 selected *** The level of evidence for the 12 documents was that of a randomized experimental *** types in cognitive rehabilitation can be divided into cognitive behavior,cognitive training,cognitive rehabilitation,and computerized cognitive *** of the studies were on schizophrenia,and the measurement areas were cognitive functions(e.g.,concentration,memory,and executive function)as well as depression,sociability,and quality of *** a result of the meta-analysis of each variable,the effect size for cognitive rehabilitation treatment was in the following order:Sociability,memory,concentration,executive function,quality of life,and ***,sociability and memory exhibited significant *** Cognitive rehabilitation aids cognitive function and sociability in patients with chronic mental illness and can be used as evidence for cognitive rehabilitation in mental health and occupational therapy.

关键词： Cognitive function Mental illness Cognitive rehabilitation Cognitive training Cognitive therapy Schizophrenia Occupational therapy

Self-motivated,thermally oxidized hematite nanoflake photoanodes:Effects of pre-polishing and ZrO_(2) passivation layer

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Journal of Energy Chemistry 2022年第2期31卷 415-423页

作者： Love Kumar Dhandole Hyun Hwi Lee Weon-sik Chae Jum Suk jang Jae Sung Lee Department of Energy Engineering School of Energy and Chemical EngineeringUlsan National Institute of Science and Technology(UNIST)Ulsan 44919Republic of Korea Division of Biotechnology College of Environmental and Bioresource SciencesChonbuk National UniversityIksan 54596Republic of Korea Pohang Accelerator Laboratory Pohang University of Science and Technology(POSTECH)Pohang 37673Republic of Korea Daegu Center Korea Basic Science InstituteDaegu 41566Republic of Korea

High-temperature thermal oxidation of an Fe foil produces a high-quality,crystalline hematite nanoflake suitable as a photoanode for the photoelectrochemical(PEC)water *** pre-polishing of the foil surface has a profound effect in the formation of a vertically-aligned nanoflakes of hematite phase with extended(110)planes by removing the loosely-bonded oxide *** the surface of the photoanode is modified with a ZrO_(2) passivation layer and a cobalt phosphate co-catalyst,the charge recombination at the photoanode-electrolyte interface is greatly suppressed to improve its overall PEC *** a result,the photocurrent density at 1.10 VRHE under 1 sun condition is enhanced from 0.22 mA cm^(-2) for an unmodified photoanode to 0.59 mA cm^(-2) for the fully modified photoanode,and the photocurrent onset potential is shifted cathodically by 400 ***,the photoanode demonstrates outstanding stability by showing steady production of H_(2) and O_(2) gases in the stoichiometric ratio of 2:1 in a continuous PEC operation for 10 h.

关键词： Fe foil Thermal oxidation Nanoflakes Photoelectrochemical water splitting Surface modifications

Improvement of hydrogen embrittlement and stress corrosion cracking by annealing for Al-4.4Mg-0.6Mn alloy

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Transactions of Nonferrous Metals Society of China 2011年第A1期21卷 17-22页

作者： Seong-jong KIM Min-Su HAN Seong-Kweon KIM Seok-Ki jang Division of Marine Engineering Mokpo National Maritime University Media Engineering Seoul National University of Technology

With no annealing treatment, cathodic polarization trends in 5083F A1 alloy revealed concentration polarization and activation polarization. However, the annealed specimens have lower current densities at corrosion protection potential compared to the non-annealed specimen. The results of SSRTs conducted in seawater at the applied potential range of-l.8 V to -0.5 V indicated that the maximum tensile strength, elongation, and time-to-fracture had high values at applied potentials of -0.7 to -1.4 V. The maximum tensile strength, elongation, and time-to-f？acture decreased when the potential values were beyond this range in either anodic or cathodic direction. In general, the increased shear lip caused by annealing treatment indicates elongation. Time-to-fracture would likely increase with elongation. Potentials between -0.5 V to -0.6 V were found to be in the region of stress corrosion cracking. The corrosion protection zone was determined to be -0.7 V to -J,4 V because these potential ranges produced good mechanical properties. Potential less than -1.4 V produced a fractured surface with a mixture of dimples （ductile fractures） and a quasi-cleavage pattern resulting from the effects of hydrogen gas.

关键词： annealing 5083F A1-Mg alloy corrosion seawater slow strain rate tests

Complicated calcified alloplastic implants in the nasal dorsum:A clinical analysis

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World Journal of Clinical Cases 2024年第18期12卷 3351-3359页

作者： Yong-Seon Hwang Taek-Kyun Kim Dong-Jun Yang Si-Hyong jang Da-Woon Lee Department of Plastic and Reconstructive Surgery College of MedicineSoonchunhyang UniversityCheonan-Si 31151South Korea Department of Plastic Surgery The PLUS Plastic Surgery ClinicSeoul 06035South Korea Department of Plastic Surgery CDU Plastic Surgery ClinicSeoul 06067South Korea Department of Pathology College of MedicineSoonchunhyang UniversityCheonan 31151Chungcheongnam-doSouth Korea

BACKGROUND In rhinoplasty,calcification around silicone implants is frequently observed in the tip dorsum(TD)***,based on a review of various literature,it is presumed that calcification in silicone implants occurs due to both inflammatory chemical reactions and physical friction against the *** calcification of nasal silicone implants not only results in the functional loss of the implants,but also leads to material ***,there is a lack of research on calcification of nasal silicone implants in the current *** To elucidate various clinical characteristics of calcification around nasal silicone implants,using histological and radiological *** This study analyzed data from 16 patients of calcified nasal implants,who underwent revision rhinoplasty for various reasons after undergoing augmentation rhinoplasty with silicone *** collected data included information on implant duration,implant types,location of calcification,presence of inflammatory reactions,and computed tomography(CT)*** The most common location of calcification,as visually analyzed,was in the TD area,accounting for 56%.Additionally,the analysis of CT scans revealed a trend of increasing Hounsfield Unit values for calcification with the duration of implantation,although this trend was not statistically significant(P=0.139).CONCLUSION Our study shows that reducing the frequency of calcification may be achievable by using softer silicone implants and by minimizing the damage to perioperative tissues.

关键词： Silicone implants Rhinoplasty Calcification Complication Hounsfield unit

High Na-ion conductivity andmechanical integrity of anion-exchanged polymeric hydrogel electrolytes for flexible sodium ion hybrid energy storage

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SusMat 2024年第1期4卷 140-153页

作者： JungWoo Hong Harpalsinh H.Rana Jeong Hee Park Jun Su Kim Sang Joon Lee Gun jang Tae Hoon Kang Kang Ho Shin Sang Ha Baek Wooseok Yang Kwang Ho Kim Ju-Hyuk Lee Ho Seok Park School of Chemical Engineering Sungkyunkwan UniversitySuwonRepublic of Korea Clean Energy Research Center Korea Institute of Science and Technology(KIST)SeoulRepublic of Korea KIST-SKKU Carbon-Neutral Research Center Sungkyunkwan University(SKKU)SuwonRepublic of Korea SKKU Institute of Energy Science and Technology(SIEST) Sungkyunkwan UniversitySuwonRepublic of Korea COSMOS LAB/92 Jomaru-ro 385beon-gilBucheon-siRepublic of Korea SKKU Advanced Institute of Nano Technology(SAINT) Sungkyunkwan UniversitySuwonRepublic of Korea Department of Health Sciences and Technology Samsung Advanced Institute for Health Sciences and Technology(SAIHST)Sungkyunkwan UniversitySuwonRepublic of Korea

The polymeric gel electrolytes are attractive owing to their higher ionic conductivities than those of dry polymer electrolytes and lowered water activity for enlarged potential ***,the ionic conductivity and mechanical strength of the Na-ion conducting polymeric gel electrolytes are limited by below 20 mS cm−1 and 2.2 ***,we demonstrate Na-ion conducting and flexible polymeric hydrogel electrolytes of the chemically coupled poly(diallyldimethylammonium chloride)-dextrin-N,N′-methylene-bisacrylamide film immersed in NaClO_(4) solution(ex-DDA-Dex+NaClO_(4))for flexible sodium-ion hybrid capacitors(f-NIHC).In particular,the anion exchange reaction and synergistic interaction of ex-DDA-Dex with the optimum ClO_(4)−enable to greatly improve the ionic conductivity up to 27.63 mS cm−1 at 25◦C and electrochemical stability window up to 2.6 V,whereas the double networking structure leads to achieve both the mechanical strength(7.48 MPa)and softness of hydrogel ***,the f-NIHCs with the ex-DDA-Dex+NaClO_(4) achieved high specific and high-rate capacities of 192.04 F g^(−1)at 500 mA g^(−1)and 116.06 F g^(−1)at 10000 mA g^(−1),respectively,delivering a large energy density of 120.03Wh kg^(−1)at 906Wkg^(−1)and long cyclability of 70%over 500 cycles as well as demonstrating functional operation under mechanical stresses.

关键词： anion exchange chemistry flexible energy storage hybrid energy storage hydrogel electrolytes renewable electrolytes sodium storage

Paleozoic tectonic evolution of the proto-Korean Peninsula along the East Asian continental margin from detrital zircon U-Pb geochronology and Hf isotope geochemistry

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Geoscience Frontiers 2024年第1期15卷 97-117页

作者： Yirang jang Sung Won Kim Vinod O.Samuel Sanghoon Kwon Seung-Ik Park M.Santosh Keewook Yi Department of Earth and Environmental Sciences Chonnam National UniversityGwangju 61186Republic of Korea Geology Division Korea Institute of Geoscience and Mineral ResourcesDaejeon 34132Republic of Korea Department of Earth System Sciences Yonsei UniversitySeoul 03722Republic of Korea Department of Geology Kyungpook National UniversityDaegu 41566Republic of Korea School of Earth Sciences and Resources China University of Geosciences BeijingBeijing 100083China Department of Earth Science University of AdelaideAdelaide SA 5005Australia Yonsei Frontiers Lab Yonsei UniversitySeoul 03722Republic of Korea Division of Earth and Environmental Sciences Korea Basic Science InstituteChungbuk 28119Republic of Korea

Detrital zircon geochronology and Hf isotope analysis can be used for inferring provenance characteristics,and to evaluate the tectonic evolution of sedimentary basins and their link with regional *** Paleozoic sequences of the Okcheon Belt consist of the Lower Paleozoic Joseon and the Upper Paleozoic Pyeongan supergroups with Middle Paleozoic hiatus locally on top of the Neoproterozoic bimodal volcanic rocks,reflecting an intracontinental rift setting between the two basements(*** and Yeongnam massifs)at southern part of the Korean *** detrital zircon U-Pb ages and Lu-Hf isotope results show that all these Paleozoic strata commonly have Paleoproterozoic and Paleozoic zircon ages with rare Meso-to Neoproterozoic *** individual zircon populations display following features,allowing estimation of their sedimentary provenances:(i)The Paleoproterozoic zircons(ca.1.85 Ga and 2.50 Ga)with similar ranges ofεHf(t)values are most common in the basement rocks of the Korean Peninsula,and were sourced from both the Gyeonggi and Yeongnam massifs.(ii)The Meso-to Neoproterozoic zircons,preserved only in the Middle to Late Cambrian clastic sedimentary rocks within the carbonate sequences probably reflect proximal provenance.(iii)The youngest Paleozoic zircons of each formation,almost coincident with their deposition ages,suggest presence of syndepositional magmatism,indicating proximal magmatic sources during their deposition.(iv)The Cambrian-Ordovician zircons,from the Lower Paleozoic sequences,but rare in the successive Upper Paleozoic sequences,suggest a provenance change after the hiatus between the two sedimentary successions.(v)The Permian zircons showing differentεHf(t)values indicate that detrital sources were varied at that *** integrated results in our study suggest provenance variability linked to diverse tectonic environments,reflecting prolonged subduction-related crustal evolution of the proto-Korean Peninsula during the Paleozo

关键词： Detrital zircon U-Pb and Hf isotopes Paleozoic metasedimentary rocks Okcheon Belt Taebaeksan zone Korean Peninsula

Dimensionality-driven metal to Mott insulator transition in two-dimensional 1T-TaSe2

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National Science Review 2024年第3期11卷 108-118页

作者： Ning Tian Zhe Huang Bo Gyu jang Shuaifei Guo Ya-Jun Yan Jingjing Gao Yijun Yu Jinwoong Hwang Cenyao Tang Meixiao Wang Xuan Luo Yu Ping Sun Zhongkai Liu Dong-Lai Feng Xianhui Chen Sung-Kwan Mo Minjae Kim Young-Woo Son Dawei Shen Wei Ruan Yuanbo Zhang State Key Laboratory of Surface Physics New Cornerstone Science Laboratory and Department of PhysicsFudan University Shanghai Qi Zhi Institute Shanghai Research Center for Quantum Sciences Institute for Nanoelectronic Devices and Quantum Computing Fudan University Zhangjiang Fudan International Innovation Center Fudan University State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology(SIMIT)Chinese Academy of Sciences School of Physical Science and Technology ShanghaiTech University Korea Institute for Advanced Study School of Emerging Technology and Department of Physics University of Science and Technology of China Advanced Light Source Lawrence Berkeley National Laboratory ShanghaiTech Laboratory for Topological Physics Key Laboratory of Materials Physics Institute of Solid State Physics Hefei Institutes of Physical ScienceChinese Academy of Sciences High Magnetic Field Laboratory Hefei Institutes of Physical Science Chinese Academy of Sciences Collaborative Innovation Centre of Advanced Microstructures Nanjing University Department of Physics University of Science and Technology of China and Key Laboratory of Strongly Coupled Quantum Matter Physics Chinese Academy of Sciences National Synchrotron Radiation Laboratory University of Science and Technology of China

Two-dimensional materials represent a major frontier for research into exotic many-body quantum phenomena. In the extreme two-dimensional limit, electron-electron interaction often dominates over other electronic energy scales, leading to strongly correlated effects such as quantum spin liquid and unconventional *** dominance is conventionally attributed to the lack of electron screening in the third dimension. Here, we discover an intriguing metal to Mott insulator transition in 1T-TaSe2that defies conventional wisdom. Specifically, we find that dimensionality crossover, instead of reduced screening, drives the transition in atomically thin 1T-TaSe2. A dispersive band crossing the Fermi level is found to be responsible for the bulk metallicity in the material. Reducing the dimensionality,however, effectively quenches the kinetic energy of these initially itinerant electrons, and drives the material into a Mott insulating *** dimensionality-driven metal to Mott insulator transition resolves the long-standing dichotomy between metallic bulk and insulating surface of 1T-TaSe2. Our work further reveals a new pathway for modulating two-dimensional materials that enables exploring strongly correlated systems across uncharted parameter space.

关键词： two-dimensional materials 1T-TaSe2 dimensionality crossover metal to Mott insulator transition