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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 ...

Plasma Processing For Surface Finishing Technology

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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Plasma Processing For Surface Finishing Technology

Adult human neural stem cell therapeutics: Current developmental status and prospect

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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World Journal of Stem Cells 2015年第1期7卷 126-136页

作者： Hyun nam kee-Hang Lee Do-Hyun nam Kyeung Min Joo Department of Neurosurgery Samsung Medical Center Sungkyunkwan University School of Medicine Seoul 135-710 South Korea Samsung Advanced Institute for Health Sciences and Technology Samsung Medical Center Sungkyunkwan University Seoul 135-710 South Korea Department of Anatomy and Cell Biology Samsung Medical Center Sungkyunkwan University School of Medicine Seoul 135-710 South Korea

Over the past two decades, regenerative therapies using stem cell technologies have been developed for various neurological diseases. Although stem cell therapy is an attractive option to reverse neural tissue damage and to recover neurological deficits, it is still under development so as not to show significant treatment effects in clinical settings. In this review, we discuss the scientific and clinical basics of adult neural stem cells(a NSCs), and their current developmental status as cell therapeutics for neurological disease. Compared with other types of stem cells, a NSCs have clinical advantages, such as limited proliferation, inborn differentiation potential into functional neural cells, and no ethical issues. In spite of the merits of a NSCs, difficulties in the isolation from the normal brain, and in the in vitro expansion, have blocked preclinical and clinical study using a NSCs. However, several groups have recently developed novel techniques to isolate and expand a NSCs from normal adult brains, and showed successful applications of a NSCs to neurological diseases. With new technologies for a NSCs and their clinical strengths, previous hurdles in stem cell therapies for neurological diseases could be overcome, to realize clinically efficacious regenerative stem cell therapeutics.

关键词： Adult neural stem cell Neurological diseases Stem cell therapy Preclinical trial Clinical trial

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

Real-world comparison of non-vitamin K antagonist oral anticoagulants and warfarin in Asian octogenarian patients with atrial fibrillation

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Journal of Geriatric Cardiology 2016年第7期13卷 566-572页

作者： Chang Hee Kwon Minsu Kim Gi-Byoung nam kee-Joon Choi You-Ho Kim Division of Cardiology Konkuk University Medical Center Konkuk University School of Medicine Seoul South Korea Division of Cardiology Asan Medical Center University of Ulsan College of Medicine Seoul South Korea

Background The efficacy and safety of non-vitamin K antagonist oral anticoagulants （NOACs） and warfarin in Asian octogenarian atrial fibrillation （AF） patients have not been established in a real-world setting. We aimed to evaluate the efficacy and safety of NOACs and warfarin in Korean octogenarian patients. Methods A total of 293 consecutive patients aged 〉 80 years with non-valvular AF who had taken either NOACs 048 cases, 50.5%） or warfarin （145 cases, 49.5%） were retrospectively reviewed. The efficacy outcome was the com- posite of stroke or systemic embolism. The safety outcome was major bleeding. Results The follow-up duration was 375 patient-years （ 172 patient-years with NOACs and 203 patient-years with warfarin）. Patients on NOACs were slightly older （P = 0.006） and had slightly higher HAS-BLED scores （P = 0.034）. The efficacy of both anticoagulants was high （1.16% for NOACs vs. 2.98% for warfarin per 100 pa- tient-years, P = 0.46）. The safety outcome was relatively high in both NOACs and warfarin groups （8.96% vs. 12.46%, P = 0.29）. The effi- cacy and safety outcomes tended to decrease non-significantly in low dose NOACs than in common dose NOACs or warfarin （0.85% vs. 1.84% vs. 2.98% in efficacy outcome, P = 0.69; and 6.97% vs. 13.29% vs. 12.46% in safety outcome, P = 0.34）. Conclusions NOACs were highly effective for prevention of stroke or systemic embolism in Asian octogenarian AF patients. However, major bleeding occurred excessively high in both anticoagulant groups. Further study is required on the optimal anticoagulant regimen in octogenarian population.

关键词： Anticoagulants Atrial fibrillation Efficacy Octogenarian Safety

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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

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

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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