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Comparison Between Full-Scale and Model Experiments of Oil Fences

China Ocean Engineering 2009年第4期23卷 657-668页

作者： Tae Ho kim Duck Jong JANG Kyong Uk YANG sun Chol NA Dae An kim School of Marine Technology Chonnam National UniversityYeosu Department of Maritime Police Science Chonnam National UniversityYeosu Korea Marine Environment Management Corporation

This study examines the performance of an air expansion oil fence system as deployed in two different configurations. Geometric and tension characteristics of the oil fence are investigated for （1） the system attached to two vessels and （2） the system attached to one vessel with spreading devices. Since full-scale testing can be time consuming and expensive, another component of the study was to examine how well models would perform. A scaling technique was developed and a set of experiments were conducted with a 1/20-th scale model of the oil fence in a towing tank facility. Performance resalts from the model tests were compared with those conducted at sea. The tension （N） in the full-scale results were represented by R = avb, where v is the current velocity in m/s and the values for a and b used for comparison purposes. Both sets of full-scale and model tests were conducted with an oil fence opening of 120 m and 160m. In the full-scale experiment with spreading devices attaahed to the forward ends of the oil fence, the horizontal distance of the spreading devices has a tendency to linearly increase as the current velocity increases when the warp length is as short as 50 m, but to linearly decrease as the current velocity increases when the warp length is extended to 100 m and 150 m. The spreading distance at uniform current velocitys in the model test increases as the warp length is extended. While there is no significant difference of spreading distance between the cases of 100 m and 150 m, the spreading distance becomes shorter when the warp length is 50 m.

关键词： oil fence spreading devices tension horizontal distance

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Photoluminescent properties of Sb^(3+)-doped and(Sb^(3+),Eu^(3+))co-doped YBO3 phosphors prepared via hydrothermal method and solid-state process

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Frontiers of Chemical Science and Engineering 2011年第4期5卷 429-434页

作者： Fushan WEN Lingling sun Jinhyeok kim College of Chemistry&Chemical Engineering China University of PetroleumDongying 257061China Photonic and Electronic Thin Film Laboratory Department of Materials Science and EngineeringChonnam National UniversityKwangju 500–757Republic of Korea

Sb^(3+)-doped YBO3 crystals were prepared through a low-temperature hydrothermal method and a high-temperature solid-state technique,*** effects of preparation methods on the morphologies and luminescent properties of YBO_(3) phosphors were *** YBO3 crystals from the hydrothermal system look likeﬂowers,whereas those from the solid-state process look like some agglomerates of little *** Sb^(3+)-doped YBO3 powders prepared via both methods showed the blue emission with the peak at around 452 nm,which corresponds to the 3P1→1S0 transition of Sb^(3+)***,the emission intensity of the Sb^(3+)-doped YBO3 from the hydrothermal system is about 3.5 times as much as that from the solid-state ***(Sb^(3+),Eu^(3+))co-doped YBO3 crystals were also prepared through the two *** results showed that the emission intensity of Sb^(3+)ions in(Sb^(3+),Eu^(3+))co-doped YBO3 synthesized by the hydrothermal method is stronger than that by the solid-state process.

关键词： hydrothermal solid-state luminescent borate

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Efficient TE-Selective P-I-i-I-N GaAs/Al_( 0.35)Ga_(0.65)As Waveguide Phase Modulator at λ=1.55μm

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光学学报 2003年第S1期23卷 341-342页

作者： sun-Pil kim Sang-sun Lee Seok Lee Deok-Ha Woo sun-Ho kim Photonics Research Laboratory Division of Electrical and Computer Engineering Hanyang University 17 Hangdang-Dong Seongdong-Ku Seoul 133-791 Korea Photonics Research Center KIST P.O.Box 131 Cheongryang Seoul 130-650 Korea

We fabricated a phase modulator with significant phase shift for TE mode but negligible for TM mode. The measured phase shift efficiency was 7.9°/*** for TE mode. No modulation was observed for TM mode.

关键词： phase shift

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Copper foam-derived electrodes as efficient electrocatalysts for conventional and hybrid water electrolysis

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Materials Reports(Energy) 2022年第2期2卷 3-20页

作者： Hainan sun Hyunseung kim Sanzhao Song WooChul Jung Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon34141Republic of Korea Wenzhou Institute University of Chinese Academy of SciencesWenzhouZhejiang325001China

Electrochemical water splitting has been demonstrated as a promising technology for the renewable generation of green hydrogen from *** the extensive progress in materials science,one particular challenge for further development towards industrial application lies in the rational design and exploitation of efficient and cost-effective materials,especially oxygen evolution reaction(OER)electrocatalysts at the *** addition,attempts to replace the OER with other more oxidizable anode reactions are being evaluated as a groundbreaking strategy for generating hydrogen at lower potentials and reducing overall energy costs while producing valuable chemicals *** with Fe/Co/Ni-based compounds,Cu-based materials have not received extensive research attention for electrode designs despite their high conductivity and abundant earth *** this review,combining with the advantages of a three-dimensional network structure of metal foams,we summarize recent progress on Cu foam(CF)-derived materials as efficient electrocatalysts towards pure water electrolysis and hybrid water *** advantages of CF and design strategies to enhance the electrocatalytic activity and operational durability are presented *** design and fabrication strategies are then highlighted and the structure-activity relationship is also ***,we propose challenges and perspectives on self-supported electrodes beyond CF-derived materials.

关键词： Conventional water electrolysis Hybrid water electrolysis Cu foam Electrocatalysts Hydrogen production Value-added chemicals

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Carcinoma in situ arising in a tubulovillous adenoma of the distal common bile duct: A case report

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World Journal of Gastroenterology 2008年第29期14卷 4705-4708页

作者： Bum-Soo kim sun-Hyung Joo Kwang-Ro Joo Department of Surgery East-West Neo Medical Center University of KyungHee College of Medicine149 Sangil-dong Gangdong-gu Seoul 134-727 Korea Department of Internal Medicine East-West Neo Medical Center University of KyungHee College of Medicine149 Sangil-dong Gangdong-gu Seoul 134-727 Korea

Tubulovillous adenomas are common in the colon and rectum, but are rare in the common bile duct. Biliary adenomas may produce obstructive jaundice, which can be easily confused with a malignant neoplasm or stone. We report a case of a carcinoma in situ arising in a tubulovillous adenoma of the distal common bile duct causing obstructive jaundice. A 55-year-old male presented with a 10-d history of pruritus and progressive jaundice. Abdominal sonography and computed tomography showed a mass in the distal common bile duct. Endoscopic retrograde cholangiopancreatography showed luminal narrowing of the bile duct due to a polypoid mass. Positron emission tomography demonstrated no abnormal uptake. It was thought that this mass was a malignant tumor, thus a pylorus-preserving panceaticoduodenectomy was performed. The final pathology showed a tubulovillous adenoma with carcinoma in situ of the distal common bile duct. At follow-up 8 mo later, endoscopy showed multiple polyps in the rectum, colon and stomach. The polyps were removed by endoscopic mucosal resection and shown to be tubular adenomas with high grade dysplasia. Biliary adenomas require careful follow-up for early detection of recurrence and malignant transformation.

关键词： Common bile duct Adenoma Carcinomain situ

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Immunosuppressant treatment for IgG4-related sclerosing cholangitis: A case report

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World Journal of Clinical Cases 2021年第1期9卷 267-273页

作者： Jong-sun kim Won Ho Choi Kyung-Ann Lee Hyun-Sook kim Department of Internal Medicine Soonchunhyang University Seoul HospitalSeoul 04401South Korea

BACKGROUND Immunoglobulin G4-related disease(IgG4-RD)is a multi-system fibroinflammatory disorder that can involve any organ,including the salivary glands,pancreas,and biliary *** of immunoglobulin G4-related sclerosing cholangitis(IgG4-SC)is similar to that for IgG4-RD,but progression is irreversible in some *** present a case of IgG4-SC in which an immuno-suppressant induced marked clinical and radiologic *** SUMMARY A 63-year-old male presented with a prominent itching sensation and wholebody *** showed obstructive-pattern jaundice,an elevated IgG4 level,and infiltration of a large number of IgG4-positive cells in the ampulla of *** imaging findings of intrahepatic duct(IHD)and common bile duct dilation,an elevated serum IgG4 level,and characteristic histological findings led to diagnosis of IgG4-SC that compatible with the 2019 ACR/EULAR classification *** planned to treat the patient with high-dose glucocorticoid(GC),followed by cyclophosphamide pulse *** treatment with high-dose GC and an immunosuppressant,imaging studies showed that IHD dilatation had completely *** Prompt diagnosis and appropriate treatment of IgG4-SC are *** there is a risk of relapse of IgG4-SC,the GC dose should be gradually reduced,and a maintenance immunosuppressant should be given.

关键词： Immunoglobulin G4-related disease Immunoglobulin G4-related sclerosing cholangitis Glucocorticoid Immunosuppressant Case report ACR/EULAR classification criteria

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A Framework for Enhancing Privacy and Anonymity in Blockchain-Enabled IoT Devices

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Computers, Materials & Continua 2024年第3期78卷 4263-4282页

作者： Muhammad Saad Muhammad Raheel Bhutta Jongik kim Tae-sun Chung Department of Artificial Intelligence Ajou UniversitySuwon443-749Korea Department of Electrical and Computer Engineering University of Utah Asia CampusIncheon21985Korea Department of Artificial Intelligence Chungnam National UniversityDaejeon34134Korea

With the increase in IoT(Internet of Things)devices comes an inherent challenge of *** the world today,privacy is the prime concern of every *** one’s privacy and keeping anonymity throughout the system is a desired functionality that does not come without inevitable trade-offs like scalability and increased complexity and is always exceedingly difficult to *** challenge is keeping confidentiality and continuing to make the person innominate throughout the *** address this,we present our proposed architecture where we manage IoT devices using blockchain *** proposed architecture works on and off blockchain integrated with the closed-circuit television(CCTV)security camera fixed at the rental *** this framework,the CCTV security camera feed is redirected towards the owner and renter based on the smart contract *** entity(owner or renter)can see the CCTV security camera feed at one *** is no third-party dependence except for the CCTV security camera deployment *** contributions include the proposition of framework architecture,a novel smart contract algorithm,and the modification to the ring signatures leveraging an existing cryptographic *** are made based on different systems’security and key management *** an empirical study,our proposed algorithm performed better in key generation,proof generation,and verification *** comparing similar existing schemes,we have shown the proposed architectures’*** now,we have developed this system for a specific area in the real ***,this system is scalable and applicable to other areas like healthcare monitoring systems,which is part of our future work.

关键词： Privacy anonymity blockchain IoT smart contracts

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Detection of stacking orientation error of CFRP composite laminates using ultrasound waves

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中国有色金属学会会刊：英文版 2009年第B9期19卷 124-127页

作者： sun-Kyu kim David HSU Young-Hwan SEO Kwang-Hee IM Division of Mechanical System Engineering Chonbuk National University Center for Nondestructive Evaluation Iowa State University Department of Physical Education Chosun University Department of Automotive Engineering Woosuk University

A jig was developed for generating a shear wave. A pyramid with an isosceles triangle with two 45o was made of aluminum to generate shear waves using two longitudinal transducers based on ultrasonic-polarized mechanism. Also, the signal splitter was connected to the pulser jack on the pulser/receiver and to the longitudinal transducers. Therefore, an experimental way was performed in order to make shear wave on the bottom of aluminum alloyed pyramid. Also, a jig was manufactured and developed for generating a shear wave based on the computer numerical simulation. It is found that the experimentally shear wave variation of newly-designed jig is consistent with computer numerical simulation results and shear wave ultrasonic application can be very useful to detect the defects in CFRP composites.

关键词：碳纤维复合材料误差检测超声波复合材料层板计算机数值模拟堆垛脉冲发生器信号分配器

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Advanced electrocatalysts with unusual active sites for electrochemical water splitting

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InfoMat 2024年第1期6卷 65-82页

作者： Hainan sun Xiaomin Xu Hyunseung kim Zongping Shao WooChul Jung Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology(KAIST)DaejeonRepublic of Korea WA School of Mines:Minerals Energy and Chemical Engineering(WASM-MECE) Curtin UniversityPerthWestern AustraliaAustralia

Electrochemical water splitting represents a promising technology for green hydrogen *** design advanced electrocatalysts,it is crucial to identify their active sites and interpret the relationship between their structures and *** extensively studied as electrocatalysts include noble-metal-based(e.g.,Ru,Ir,and Pt)and non-noble-metal-based(e.g.,3d transition metals)***,advancements in characterization techniques and theoretical calculations have revealed novel and unusual active *** present review highlights the latest achievements in the discovery and identification of various unconventional active sites for electrochemical water splitting,with a focus on state-of-the-art strategies for determining true active sites and establishing structure–activity ***,we discuss the remaining challenges and future perspectives for the development of next-generation electrocatalysts with unusual active *** presenting a fresh perspective on the unconventional reaction sites involved in electrochemical water splitting,this review aims to provide valuable guidance for the future study of electrocatalysts in industrial applications.

关键词： electrochemical water splitting hydrogen evolution reaction oxygen evolution reaction structure–activity relationship unusual active sites

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Kale Juice Improves Coronary Artery Disease Risk Factors in Hypercholesterolemic Men

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Biomedical and Environmental Sciences 2008年第2期21卷 91-97页

作者： SOO YEON kim sun YOON SOO MI KWON KYE SOOK PARK YANG CHA LEE-kim Graduate School of Human Environmental Science Department of Food and Nutrition College of Human Ecology Yonsei Health Center Yonsei University 134 Shinchon-dong Sudaemun-ku 120-749 Seoul Korea

Objective To evaluate the effect of 3-month kale （Brassica oleracea acephala） juice supplementation on coronary artery disease risk factors among hypercholesterolemic men. Methods Thirty-two men with hypercholesterolemia （〉 200 mg/dL） were recruited after annual health examinations among the faculty and staff at university. The subjects consumed 150 mL of kale juice per day for a 12-week intervention period. Dietary and anthropometric assessments were performed and blood samples were collected to evaluate biochemical profiles before and after supplementation. Results Serum concentrations of HDL-cholesterol, and HDL- to LDL-cholesterol ratio were significantly increased by 27% （P〈0.0001） and 52% （P〈0.0001）, respectively. The LDL-cholesterol concentration and the atherogenic index were significantly reduced by 10% （P=0.0007） and 24.2% （P〈0.0001）, respectively without affecting body mass index, waist and hip circumferences, or nutrient intakes after three months of supplementation. While there was no difference in the concentration of malondialdehyde, significant increase in glutathione peroxidase activity （P=0.0005） were accompanied by a significant increase in the serum selenium level （P=0.0132）. It was also found that the responses of these risk factors to kale juice administration were dependent on smoking status. Conclusion Regular meals supplementation with kale juice can favorably influence serum lipid profiles and antioxidant systems, and hence contribute to reduce the risks of coronary artery disease in male subjects with hyperlipidemia.

关键词： Kale juice Hyperlipidemia Coronary artery disease Lipid profile Antioxidant system

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