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Tailoring Classical Conditioning Behavior in TiO_(2) Nanowires:ZnO QDs-Based Optoelectronic Memristors for Neuromorphic Hardware

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Nano-Micro Letters 2024年第7期16卷 265-280页

作者： Wenxiao Wang Yaqi Wang Feifei Yin Hongsen Niu Young-kee Shin Yang Li Eun-Seong Kim nam-Young Kim School of Information Science and Engineering University of JinanJinan 250022People’s Republic of China RFIC Centre NDAC CentreKwangwoon UniversityNowon-guSeoul 139-701South Korea Department of Electronics Engineering Kwangwoon UniversityNowon-GuSeoul 139-701South Korea School of Microelectronics Shandong UniversityJinan 250101People’s Republic of China Department of Molecular Medicine and Biopharmaceutical Sciences Seoul National UniversitySeoul 08826South Korea

Neuromorphic hardware equipped with associative learn-ing capabilities presents fascinating applications in the next generation of artificial ***,research into synaptic devices exhibiting complex associative learning behaviors is still ***,an optoelec-tronic memristor based on Ag/TiO_(2) Nanowires:ZnO Quantum dots/FTO was proposed and constructed to emulate the biological associative learning *** implementation of synaptic behaviors,including long and short-term plasticity,and learning-forgetting-relearning behaviors,were achieved in the device through the application of light and electrical *** the optoelectronic co-modulated characteristics,a simulation of neuromorphic computing was conducted,resulting in a handwriting digit recognition accuracy of 88.9%.Furthermore,a 3×7 memristor array was constructed,confirming its application in artificial visual *** importantly,complex biological associative learning behaviors were emulated by mapping the light and electrical stimuli into conditioned and unconditioned stimuli,*** training through associative pairs,reflexes could be triggered solely using light ***-sively,under specific optoelectronic signal applications,the four features of classical conditioning,namely acquisition,extinction,recovery,and generalization,were elegantly *** work provides an optoelectronic memristor with associative behavior capabilities,offering a pathway for advancing brain-machine interfaces,autonomous robots,and machine self-learning in the future.

关键词： Artificial intelligence Classical conditioning Neuromorphic computing Artificial visual memory Optoelectronic memristors ZnO Quantum dots

Ti-Si-C-N Nanocomposite Coatings Prepared by Hybrid Coating Method for Hard Coating Applications

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Ti-Si-C-N Nanocomposite Coatings Prepared by Hybrid Coating ...

Advances in advanced solution-synthesis-based structural materials for tactile sensors and their intelligent applications

第三届微电子及等离子体技术国际会议

作者： T.Elangovan Seunghun Lee kee-seok nam Jong-Kuk Kim Do-Geun Kim Korea Institute of Materials Science

Ti-Si-C-N nanocomposite coatings were synthesized using a filtered vacuum arc（FVA） technique with varying silicon（Si） content.A metal organic precursor,tetramethylsilane（TMS）,was used as the silicon and carbon *** Si content in the films was varied in a range of 2.1 to 16.2 at.% by changing the flow rates of TMS from 5 to 20 ***-deposited films were investigated for chemical and structural properties using X-ray photoelectron spectroscopy（XPS）,X-ray diffraction（XRD） and transmission electron microscopy（TEM）,*** and scratch studies were carried out for extracting mechanical properties of the Ti-Si-C-N *** and TEM results revealed that the formation of nanocrystalline TiCN phase and amorphous Si3N4 with different silicon contents on nanocomposite *** chemical state of for Ti-Si-C-N nanocomposite coating result indicates the Ti 2p3/2 for 457.06,N 1s for 396.9 eV,Si3N4 for 101.8 eV and SiC at both 100.4 eV and 100.7 eV the peak signals observed according to their binding *** the silicon content in the films was found to control the microstructure and crystallite size of TiCN phase.A maximum hardness of 42 GPa and a coefficient of friction of 0.17 were obtained for the film containing a silicon content of 3 at.%.

关键词： Ti-Si-C-N Nanocomposite Filtered Vacuum Arc(FVA) Tetramethylsilane TMS

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InfoMat 2024年第1期6卷 31-64页

作者： Hongsen Niu Ning Li Eun-Seoung Kim Young kee Shin nam-Young Kim Guozhen Shen Yang Li School of Information Science and Engineering University of JinanJinanthe People's Republic of China RFIC Centre Department of Electronics EngineeringKwangwoon UniversitySeoulRepublic of Korea Department of Molecular Medicine and Biopharmaceutical Sciences Seoul National UniversitySeoulRepublic of Korea School of Integrated Circuits and Electronics Beijing Institute of TechnologyBeijingthe People's Republic of China School of Microelectronics Shandong UniversityJinanthe People's Republic of China

Intelligent applications,with tactile sensors at their core,represent significant advancement in the field of artificial ***,achieving perception abilities in tactile sensors that match or exceed human skin remains a formidable ***,the design and implementation of hierarchical structural materials are considered the optimal solution to this *** contrast to conventional methods,such as complicated lithography and three-dimensional printing,the cost-effective and scalable nature of advanced solution-synthesis methods makes them ideal for preparing diverse tactile sensors with hierarchical structural ***,the process and applicability of advanced solution synthesis methods have yet to form a seamless ***,the development and intellectualization of tactile sensors based on advanced solution synthesis methods are still in their early stages,and require a comprehensive and systematic review to usher in *** study delves into the advantages and disadvantages of various advanced solution synthesis methods,providing detailed ***,the positive effects of hierarchical structural materials constructed using these methods in tactile sensors and their intelligent applications are also discussed in ***,the challenges and future opportunities faced by this emerging field are summarized.

关键词： aqueous phase reduction artificial intelligence hydrothermal growth in situ polymerization tactile sensor

Plasma Processing For Surface Finishing Technology

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Plasma Processing For Surface Finishing Technology

Vertical plane depth-resolved surface potential and carrier separation characteristics in flexible CZTSSe solar cells with over 12% efficiency

Fifth International Conference on Surface Engineering

作者： Sik-Chol Kwon Jong-Ju Rha Gun-Hwan Lee Man Kim kee-seok nam Kyu-Hwan Lee Surface Engineering Center Korea Institute of Machinery ＆ Materials66 ChangwonKyungnam-DoSouth Korea

Plasma processing becomes essential to surface technology since its inception to semiconductor *** the increasing concern on environmental problem associated with surface finishing industry,new solution has been demanded to develop an advanced wet-processing without pollution *** addition,new initiatives such as ELV and WEEE demand for green process without any harmful by-product during and after ***,inception of plasma process to surface finishing industry has placed a milestone to contribute to develop an environmental-friendly dry process as alternative to a conventional wet process as denoted as *** this presentation,the current issues on the wet finishing process will be reviewed *** comparison between the conventional and alternative process using plasma process will be outlined in the point of new process and materials used in addition to environmental *** prospect of plasma technology will be envisioned in the future coating ***,new potential to hybrid processes developed in KIMM will be introduced to overcome the economic problem which the plasma process usually has in practical application.

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Carbon Energy 2024年第3期6卷 36-52页

作者： Dae-Ho Son Ha Kyung Park Dae-Hwan Kim Jin-Kyu Kang Shi-Joon Sung Dae-Kue Hwang Jaebaek Lee Dong-Hwan Jeon Yunae Cho William Jo Taeseon Lee JunHo Kim Sang-Hoon nam kee-Jeong Yang Division of Energy Technology DGISTDaeguRepublic of Korea Research Center for Thin Film Solar Cells DGISTDaeguRepublic of Korea Department of Physics Ewha Womans UniversitySeoulRepublic of Korea Department of Physics Incheon National UniversityIncheonRepublic of Korea Department of Mechanical Engineering Massachusetts Institute of TechnologyCambridgeMassachusettsUSA

Cu2ZnSn(S,Se)4(CZTSSe)solar cells have resource distribution and economic *** main cause of their low efficiency is carrier loss resulting from recombination of photo-generated electron and *** overcome this,it is important to understand their electron-hole behavior *** determine the carrier separation characteristics,we measured the surface potential and the local current in terms of the absorber *** elemental variation in the intragrains(IGs)and at the grain boundaries(GBs)caused a band edge shift and bandgap(Eg)*** the absorber surface and subsurface,an upward Ec and Ev band bending structure was observed at the GBs,and the carrier separation was *** the absorber center,both upward Ec and Ev and downward Ec-upward Ev band bending structures were observed at the GBs,and the carrier separation was *** improve the carrier separation and suppress carrier recombination,an upward Ec and Ev band bending structure at the GBs is desirable.

关键词： carrier separation CZTSSe flexible solar cell local current surface potential

Complications of common bile duct stones: A risk factors analysis

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Hepatobiliary & Pancreatic Diseases International 2021年第4期20卷 361-365页

作者： Dong Jun Oh Ji Hyung nam Dong kee Jang Jun Kyu Lee Department of Internal Medicine Dongguk University Ilsan HospitalGoyang 10326Korea

Background: The latest guidelines recommended that common bile duct stones(CBDSs) should be removed, preferably endoscopically, regardless of the presence of symptoms or complications. However, the removal of CBDSs may not be feasible in very old patients or those with co-morbidities. In these cases, it is important to understand the risk factors for the development of CBDSs-related complications to decide whether or not to treat high-risk patients. Herein, we aimed to identify the risk factors for the development of complications after the diagnosis of CBDSs. Methods: The medical records of patients with CBDSs between October 2005 and September 2019 were retrospectively analyzed. All patients with radiologically-diagnosed CBDSs, including those who received treatment and those who did not, were analyzed. Results: A total of 634 patients were included and 95(15.0%) patients had CBDS-related complications during the mean follow-up period of 32.6 months. Forty-four(6.9%) high-risk patients remained asymptomatic and did not receive treatment during the follow-up period. In multivariate analyses, size of CBDSs ≥ 5 mm and no treatment within 30 days were independent risk factors for the development of complications. The spontaneous passage of CBDSs was proved radiologically in 9 out of 81(11.1%) patients within 30 days. Conclusions: It is recommended treating CBDSs within 30 days from the diagnosis, even in high-risk patients, especially if the size is larger than 5 mm.

关键词： Common bile duct stone Risk factors Obstructive jaundice Pancreatitis Cholangitis

Duo Property on the Monoid of Regular Elements

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Algebra Colloquium 2022年第2期29卷 203-216页

作者： Chan Yong Hong Hong kee Kim nam Kyun Kim Tai Keun Kwak Yang Lee Department of Mathematics Kyung Hee UniversitySeoul 02447Korea Department of Mathematics and RINS Gyeongsang National University Jinju 52828Korea School of Basic Sciences Hanbat National UniversityDaejeon 34158Korea Department of Mathematics Daejin UniversityPocheon 11159Korea Department of Mathematics Yanbian UniversityYanjiJilin 133002China Instituteof Basic Science Daejin UniversityPocheon 11159Korea

We study the right duo property on regular elements,and we say that rings with this property are right *** is first shown that the right duo property is preserved by right quotient rings when the given rings are right *** prove that thepolynomial ring over a ring R is right DR if and only if R is *** is also proved that for a prime number p,the group ring KG of a finite p-group G over a field K of characteristic p is right DR if and only if it is right duo,and that there exists a group ring KG that is neither DR nor duo when G is not a p-group.

关键词： right DR ring right duo ring quotient ring (skew)polynomial ring group ring

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Soy, soil and beyond

Soil Ecology Letters 2023年第4期5卷 1-3页

作者： Wee kee Tan Jingling Zhu Jun Li Choon nam Ong NUS Environmental Research Institute National University of Singapore5A Engineering Drive 1T-Lab#02-01Singapore 117411Singapore Department of Biomedical Engineering National University of Singapore7 Engineering Drive 1Singapore 117574Singapore Saw Swee Hock School of Public Health National University of Singapore12 Science Drive 2Singapore 117549Singapore

Summary Soy and its quest for future food ***,or soybean(Glycine max),is a leguminous plant that has played a significant role in various civilizations throughout human *** are native to East Asia and have been cultivated in China for thousands of *** a food source,soy has a wide range of uses,they include tofu,tempeh,soy milk,soy sauce,miso,soy-based meat alternatives,desserts and *** products serve as alternatives to animal-based proteins and dairy products for vegetarians,vegans,and individuals with dietary *** addition,soybean oil is one of the most widely consumed cooking oils *** is used for frying,baking,sautéing,and salad dressings due to its mild flavour and high smoke *** oil is also used as an ingredient in margarine,mayonnaise,and other food products.

关键词： soybean smoke soil

Advanced polymer materials-based electronic skins for tactile and non-contact sensing applications

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InfoMat 2023年第7期5卷 1-42页

作者： Feifei Yin Hongsen Niu Eun-Seong Kim Young kee Shin Yang Li nam-Young Kim Department of Electronics Engineering Kwangwoon UniversitySeoulRepublic of Korea Department of Molecular Medicine and Biopharmaceutical Sciences Seoul National UniversitySeoulRepublic of Korea School of Information Science and Engineering University of JinanJinanthe People's Republic of China

Recently,polymer materials have been at the forefront of other materials in building high-performance flexible electronic skin(e-skin)devices due to con-spicuous advantages including excellent mechanical flexibility,good compatibil-ity,and high ***,most research works just paid considerable attention and effort to the design,construction,and possible application of e-skins that reproduce the tactile perception of the human skin sensory *** with tactile sensing devices,e-skins that aim to imitate the non-contact sensing features in the sensory system of human skin tend to avoid undesired issues such as bacteria spreading and mechanical *** further promote the development of e-skins to the human skin sensory system where tactile perception and non-contact sensing complement each other,significant progress and advances have been achieved in the field of polymer materials enabled e-skins for both tactile perception and non-contact sensing *** this review,the latest progress in polymer material-based e-skins with regard to tactile,non-contact sensing capabilities and their practical applications are *** fabrication strategies of polymer materials and their role in building high-performance e-skins for tactile and non-contact sensing are ***,we also review the research works that integrated the polymer-based tactile and non-contact e-skins into robots and prostheses,smart gloves,and VR/AR devices and addressed some representative problems to dem-onstrate their suitability in practical applications in human–machine ***,the current challenges in the construction of high-performance tactile and non-contact e-skins are highlighted and promising properties in this direction,by taking advantage of the polymer materials,are outlined.

关键词： electronic skins human-machine interaction non-contact sensing polymer materials tactile sensing