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Improvement in the Adhesion Between Electrode of a SOFC and Ag Paste as a Current Collector by Au Deposition

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Journal of Materials Science & Technology 2015年第3期31卷 257-263页

作者： Sang Koo Jeon seung hoon Nahm oh Heon Kwon Department of Safety Engineering Pukyong National University Center for Energy Materials Metrology Korea Research Institute or Standards and Science

This paper reports the use of Au films to improve the performance of the stacked solid oxide fuel cell(SOFC) based on the characterization of the interface and the adhesion between the electrodes of the SOFCs and the Ag paste. The specimens were manufactured to perform the experiment as follows. A Si O2 wafer with a 300 mm notch was attached to the electrodes of a SOFC by a Ag paste and Au film, which were deposited on the electrodes by sputtering for 1 min or 5 min deposition time and annealed at300 C for 1 h. The four-point bending test was performed, which resulted in the formation of an extended crack at the tip on the wafer notch, and the crack propagation was observed using a stereo microscope equipped with a charge-coupled device(CCD). Consequently, the interfacial adhesion energy and the effect of the Au film between the each electrode and the Ag paste can be evaluated. On the cathode, the interfacial adhesion energy without Au film was 2.59 J/m2(upper value) and the adhesion energy increased to 11.59 J/m2(upper value) and 15.89 J/m2(lower value) with the Au film. On the anode,the interfacial adhesion energy without Au film was 1.74 J/m2(upper value), which increased to 11.07 J/m2(upper value) and 14.74 J/m2(lower value) with the Au film. In addition, the interface areas were analyzed by scanning electron microscopy(SEM) and energy dispersive spectroscopy(EDS) to estimate the interface delamination.

关键词： Solid oxide fuel cell Au film Interfacial adhesion

Dirac solitons in optical microresonators

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Light(Science & Applications) 2020年第1期9卷 1-15页

作者： Heming Wang Yu-Kun Lu Lue Wu Dong Yoon oh Boqiang Shen seung hoon Lee Kerry Vahala T.J.Watson Laboratory of Applied Physics California Institute of TechnologyPasadenaCA 91125USA Research Laboratory of Electronics MIT-Harvard Center for Ultracold AtomsDepartment of PhysicsMassachusetts Institute of TechnologyCambridgeMAUSA Rockley Photonics Inc. PasadenaCAUSA Apple Inc. CupertinoCAUSA

Mode-coupling-induced dispersion has been used to engineer microresonators for soliton generation at the edge of the visible ***,we show that the optical soliton formed in this way is analogous to optical Bragg solitons and,more generally,to the Dirac soliton in quantum field *** optical Dirac soliton is studied theoretically,and a closed-form solution is derived in the corresponding conservative *** analytical and numerical solutions show unusual properties,such as polarization twisting and asymmetrical optical *** closed-form solution is also used to study the repetition rate shift in the *** observation of the asymmetrical spectrum is analysed using *** properties of Dirac optical solitons in microresonators are important at a fundamental level and provide a road map for soliton microcomb generation in the visible band.

关键词： theory spectra soliton

A digital application for implementing the ICD-11 traditional medicine chapter

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Journal of Integrative Medicine 2020年第6期18卷 455-458页

作者： seung-hoon Choi Department of Life Convergence Graduate SchoolDankook UniversityYonginGyeonggi-do 16890Republic of Korea

On May 25,2019,the World Health Assembly approved the eleventh revision of the International Statistical Classification of Diseases and Related Health Problems(ICD-11),containing a chapter on traditional *** means that the traditional East Asian medicine(TEAM)is now officially recognized as a part of mainstream medical ***,the patterns presented in the ICD-11 traditional medicine chapter are only the tip of the iceberg of TEAM clinical practice,and it will be necessary to supplement and upgrade the *** order to implement this,objectification and standardization of TEAM must be premised,and grafting with proper modern science and technology is *** Identification and Prescription Expert-11(PIPE-11),which is a TEAM clinical decision support system,adopts vastly from clinical literature on pattern identification and the *** adopting the rule-based reasoning method,the way of diagnosis and prescription by a TEAM practitioner in actual clinical practice is implemented as it ***-11 could support to improve both the accuracy of medical diagnosis and the reliability of the medical treatment of TEAM in clinical *** the field of research,it might facilitate the usage for reliable reference for symptoms and signs retrieval and patient *** the field of education,it can provide a high level of training for learning pattern identification and prescription,and further be used to reinforce skills of diagnosis and prescription by providing self-simulation ***,PIPE-11 as a digital application is expected to support the traditional medicine chapter of ICD-11 to successfully contribute to the improvement of human health.

关键词： ICD-11 PIPE-11 Traditional medicine Clinical decision support system Formula Pattern

Nutritional risk index as a predictor of postoperative wound complications after gastrectomy

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World Journal of Gastroenterology 2012年第7期18卷 673-678页

作者： Cheong Ah oh Dae hoon Kim seung Jong oh Min Gew Choi Jae Hyung Noh Tae Sung Sohn Jae Moon Bae Sung Kim Department of Surgery Samsung Medical CenterSungkyunkwan University School of Medicine50 Irwon-dongGangnamguSeoul 135-710South Korea

AIM： To investigate the correlation between the nutri- tional risk index （NRI） and postoperative wound com- plications.

关键词： Nutritional risk index Wound complication Gastric cancer

Quantifying and managing regional greenhouse gas emissions: Waste sector of Daejeon, Korea

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Journal of Environmental Sciences 2014年第6期26卷 1249-1259页

作者： Sora Yi Heewon Yang seung hoon Lee Kyoung-Jin An Department of Urban Planning Research Daejeon Development Institute Department of Environmental Engineering Anyang University Faculty of Science & Technology The Technological and Higher Education Institute of Hong KongNew Territories Hong Kong China

A credible accounting of national and regional inventories for the greenhouse gas （GHG） reduction has emerged as one of the most significant current discussions. This article assessed the regional GHG emissions by three categories of the waste sector in Daejeon Metropolitan City （DMC）, Korea, examined the potential for DMC to reduce GHG emission, and discussed the methodology modified from Intergovernmental Panel on Climate Change and Korea national guidelines. During the last five years, DMC＇s overall GHG emissions were 239 thousand tons C02 eq./year from eleven public environmental infrastructure facilities, with a population of 1.52 million. Of the three categories, solid waste treatment/disposal contributes 68%, whilst wastewater treatment and others contribute 22% and 10% respectively. Among GHG unit emissions per ton of waste treatment, the biggest contributor was waste incineration of 694 kg CO2 eq./ton, followed by waste disposal of 483 kg CO2 eq./ton, biological treatment of solid waste of 209 kg CO2 eq./ton, wastewater treatment of 0.241 kg CO2 eq./m3, and public water supplies of 0.067 kg CO2 eq./m3. Furthermore, it is suggested that the potential in reducing GHG emissions from landfill process can be as high as 47.5% by increasing landfill gas recovery up to 50%. Therefore, it is apparent that reduction strategies for the main contributors of GHG emissions should take precedence over minor contributors and lead to the best practice for managing GHGs abatement.

关键词： Solid waste disposal biological treatment of solid waste waste incineration wastewater treatment public water supply

Identification and preoperative optimization of risk factors to prevent periprosthetic joint infection

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World Journal of Orthopedics 2014年第3期5卷 362-367页

作者： seung-hoon Baek Department of Orthopedic Surgery Kyungpook National University HospitalDaegu 700-721South Korea

Despite significant improvements over the past several decades in diagnosis,treatment and prevention of periprosthetic joint infection(PJI),it still remains a major challenge following total joint *** the devastating nature and accelerated incidence of PJI,prevention is the most important strategy to deal with this challenging problem and should start from identifying risk *** and well-organized optimization of these risk factors in individuals before elective arthroplasty are essential to the ultimate success in reducing the incidence of *** though some risk factors such as demographic characteristics are seldom changeable,they allow more accurate expectation regarding individual risks of PJI and thus,make proper counseling for shared preoperative decision-making *** that increase the risk of PJI,but are potentially modifiable should be optimized prior to elective *** remarkable advances have been achieved in past decades,many questions regarding standardized practice to prevent this catastrophic complication remain *** current study provide a comprehensive knowledge regarding risk factors based on general principles to control surgical siteinfection by the review of current literature and also share own practice at our institution to provide practical and better understandings.

关键词： Total joint arthroplasty Periprosthetic joint infection Prevention Risk factors Preoperative optimization

Long-term performance of fiber-grid-reinforced asphalt overlay pavements: A case study of Korean national highways

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Journal of Traffic and Transportation Engineering(English Edition) 2019年第4期6卷 366-382页

作者： Jong-hoon Lee seung-Beom Baek Kang-hoon Lee Jo-Soon Kim Jin-hoon Jeong Department of Civil Engineering Inha UniversityIncheon 22212South Korea Civil&Environmental BG Doosan Engineering&ConstructionSeoul 06057South Korea Department of Infrastructure Safety Research Korea Institute of Civil Engineering and Building TechnologyGoyang-si 10223South Korea SN Construction Co. LtdDaejeon 34573South Korea

The objective of this study was to verify the effect of fiber grid reinforcement on the longterm performance of asphalt overlay pavements by performing field investigation, laboratory test, and finite element analysis. Crack, rutting, roughness, and other miscellaneous distresses of fiber-grid-reinforced overlay sections and ordinary overlay sections were compared. Pavement conditions of fiber grid overlay sections before and after the overlay were also compared. Cores were obtained from the fiber-grid-reinforced and ordinary sections to measure bonding shear strength between the intermediate and overlay *** energy, displacement after yield, and shear stiffness of the cores were also obtained by analyzing the test results. Finite element analysis was performed by using the test results to validate the effect of the fiber grid reinforcement on the long-term performance of asphalt overlay pavements. Rutting and fatigue cracking were predicted for three cases: 1) fiber grid was not used;2) glass fiber grid was used;and 3) carbon fiber grid was used. The cracking ratio of fiber-grid-reinforced sections was much smaller than that of ordinary sections. The results of field investigation, laboratory test, and finite element analysis showed that the fiber grid reinforcement improved the long-term performance of asphalt overlay pavements.

关键词： Asphalt pavement Fiber grid reinforcement Overlay pavement Finite element analysis Bonding shear strength

Human neural stem cells promote proliferation of endogenous neural stem cells and enhance angiogenesis in ischemic rat brain

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Neural Regeneration Research 2016年第2期11卷 298-304页

作者： Sun Ryu seung-hoon Lee seung U.Kim Byung-Woo Yoon Department of Neurology and Clinical Research Institute Seoul National University Hospital Seoul National University Medical Research Center Seoul National University Medical Research Institute Chung-Ang University School of Medicine Department of Neurology UBC Hospital University of British Columbia

Transplantation of human neural stem cells into the dentate gyrus or ventricle of rodents has been reportedly to enhance neurogenesis. In this study, we examined endogenous stem cell proliferation and angiogenesis in the ischemic rat brain after the transplantation of human neural stem cells. Focal cerebral ischemia in the rat brain was induced by middle cerebral artery occlusion. Human neural stem cells were transplanted into the subventricular zone. The behavioral performance of human neural stem cells-treated ischemic rats was significantly improved and cerebral infarct volumes were reduced compared to those in untreated animals. Numerous transplanted human neural stem cells were alive and preferentially localized to the ipsilateral ischemic hemisphere. Furthermore, 5-bromo-2′-deoxyuridine-labeled endogenous neural stem cells were observed in the subventricular zone and hippocampus, where they differentiated into cells immunoreactive for the neural markers doublecortin, neuronal nuclear antigen Neu N, and astrocyte marker glial fibrillary acidic protein in human neural stem cells-treated rats, but not in the untreated ischemic animals. The number of 5-bromo-2′-deoxyuridine-positive ？ anti-von Willebrand factor-positive proliferating endothelial cells was higher in the ischemic boundary zone of human neural stem cells-treated rats than in controls. Finally, transplantation of human neural stem cells in the brains of rats with focal cerebral ischemia promoted the proliferation of endogenous neural stem cells and their differentiation into mature neural-like cells, and enhanced angiogenesis. This study provides valuable insights into the effect of human neural stem cell transplantation on focal cerebral ischemia, which can be applied to the development of an effective therapy for stroke.

关键词： nerve regeneration focal cerebral ischemia middle cerebral artery occlusion human neural stem cells transplantation differentiation infarct size behavioral analysis endogenous neurogenesis angiogenesis rats neural regeneration

Transient elastography in chronic hepatitis B: An Asian perspective

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World Journal of Gastroenterology 2010年第41期16卷 5173-5180页

作者： seung Up Kim Kwang-Hyub Han Sang hoon Ahn Department of Internal Medicine Institute of Gastroenterology Yonsei University College of Medicine Seoul 120-752 South Korea Liver Cirrhosis Clinical Research Center Seoul 120-752 South Korea Brain Korea 21 Project for Medical Science Seoul 120-752 South Kore

Transient elastography (TE) is a new non-invasive tool for assessing liver stiffness, which is correlated with the histologic stage of liver fibrosis. Many studies have reported a good accuracy of TE in predicting signif icant fibrosis and an optimal accuracy in predicting cirrhosis. Furthermore, the potential role of TE in screening the general population has also been proven. TE thus helps physicians to decide treatment strategies, predict prog-nosis, and monitor disease progression in patients with chronic liver disease and to screen the general popula-tion to identify high risk patients with potential liver disease. However, most data on the clinical roles of TE have been gathered in European patients with chronic hepatitis C (CHC), because TE was first developed in France. Accordingly, much data on the usefulness of TE in patients with CHC has accumulated. Recently, however, vigorous efforts have been made to apply TEto patients with chronic hepatitis B (CHB), and TE has also proved to have acceptable accuracy in diagnosing liver fibrosis and cirrhosis in these patients. Thus, we focused on TE in the Asian population with CHB in comparison with the European population with CHC and found that the diagnostic performance and cutoff values were different between the 2 populations possibly as a result of several different confounders between Asian and European populations (the etiology of chronic liver disease, histologic features, major fluctuation in alanine aminotransferase levels, and the prevalence of high body mass index and metabolic syndrome). Therefore, further studies tailored to the Asian population with CHB should be performed before the widespread application of TE in Asian populations with CHB.

关键词： Asia Chronic hepatitis B Fibroscan Hepatitis B virus Liver stiffness measurement Transient elas-tography