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生物数学学报 2011年第2期26卷 247-254页

作者：周蓉 choi Y s 运城学院应用数学系山西运城044000 美国康涅狄格大学

研究了一个二维细胞运动模型,该模型是个动边界问题.我们运用运动网格的有限元算法对此模型进行了数值模拟,数值结果表明,细胞最终收敛到固定形状,并且以固定速度向前运动.

关键词：细胞运动模型动边界问题有限元数值模拟

ANALYsIs OF NOIsE sOURCE FOR MOLD TRANsFORMER

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ANALYSIS OF NOISE SOURCE FOR MOLD TRANSFORMER

Big Data Analytics Using Graph signal Processing

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作者： w.H.choi w.C.Kim B.s.Yang Y.M.Kim R＆D Institute Hyosung CorporationChangwon 641-712South Korea Gyeongsang National University TongyoungKyongnam 650-160South Korea Pukyong National University San 100 Yongdang-dongNam-kuPusan 608-739South Korea Pukyong National University San 100 Yongdang-dongNam-kuPusan 608-739South Korea

＜正＞ This paper investigates the noise source and counter-measure of mold transformer radiated high *** result of the impact hammering test forthe core of the transformer ascertains the core resonanceby harmonics of the line frequency and the high noise canbe reduced to avoid the core resonance by the changingtorque strength of the tie *** reason that the noise ofV-phase is higher than U and w-phases in the normalcondition presents by evaluating the magnetic force ofeach phase.

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Computers, Materials & Continua 2023年第1期74卷 489-502页

作者： Farhan Amin Omar M.Barukab Gyu sang choi Department of Information and Communication Engineering Yeungnam UniversityGyeongsan38541Korea Faculty of Computing and Information Technology-Rabigh King Abdulaziz UniversityJeddahSaudi Arabia

The networks are fundamental to our modern world and they appear throughout science and *** to a massive amount of data presents a unique opportunity to the researcher’s *** networks grow in size the complexity increases and our ability to analyze them using the current state of the art is at severe risk of failing to keep ***,this paper initiates a discussion on graph signal processing for large-scale data *** first provide a comprehensive overview of core ideas in Graph signal processing(GsP)and their connection to conventional digital signal processing(DsP).we then summarize recent developments in developing basic GsP tools,including methods for graph filtering or graph learning,graph signal,graph Fourier transform(GFT),spectrum,graph frequency,*** filtering is a basic task that allows for isolating the contribution of individual frequencies and therefore enables the removal of *** then consider a graph filter as a model that helps to extend the application of GsP methods to large *** show the suitability and the effeteness.w. first created a noisy graph signal and then applied it to the *** several rounds of simulation *** see that the filtered signal appears to be smoother and is closer to the original noise-free distance-based *** using this example application,we thoroughly demonstrated that graph filtration is efficient for big data analytics.

关键词： Big data data science big data processing graph signal processing social networks

Revolutionizing Thermal stability and self‑Healing in Pressure sensors:A Novel Approach

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Advanced Fiber Materials 2023年第6期5卷 2028-2039页

作者： su Bin choi Jagan singh Meena Jong‑woong Kim Department of smart Fab Technology Sungkyunkwan UniversitySuwon 16419Republic of Korea Research Center for Advanced Materials Technology Core Research InstituteSungkyunkwan UniversitySuwon 16419Republic of Korea school of Mechanical Engineering Sungkyunkwan UniversitySuwon 16419Republic of Korea

soft electronics.w.ich require mechanical elasticity,rely on elastic materials that have both a small Young’s modulus and a large elastic strain *** materials,however,are prone to damage when stress accumulates,presenting a significant challenge for soft *** address this issue,the integration of self-healing functionality into these materials appears to be a promising *** covalent bond chemistry has been utilized to design high-strength polymers.w.th controllable ***,the temperature needed to trigger self-healing may induce thermal damage to other parts of the *** contrast,if the self-healing temperature is reduced,the device might suffer damage when exposed to temperatures exceeding the self-healing point due to the low stability of the polymer at high *** challenges highlight the need for materials that can self-heal at low temperatures.w.ile maintaining thermal stability at high *** response to this challenge,we propose a novel approach that involves forming a microfibrous network using polycaprolactone(PCL),a material with a low melting temperature of 60°C that is.w.dely utilized in shape memory and self-healing *** fabricated the conductive fiber by encapsulating a microfiber PCL network with MXene *** MXene nanosheets.w.re seamlessly coated on the PCL fiber’s surface to prevent shape deformation at high ***,they exhibited high thermal conductivity,facilitating rapid internal heat ***,the MXene/PCL microfiber networks demonstrated self-healing capabilities at 60°C and thermal stability above 200°*** makes them potentially suitable for stretchable,self-healing electronic devices that need to withstand high temperatures.

关键词： Fibers MXene self-healing Pressure sensor Thermal stability Electrospinning

Hyperinsulinemic hypoglycemia due to diffuse nesidioblastosis in adults:A case report

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world Journal of Gastroenterology 2008年第1期14卷 140-142页

作者： Ran Hong Dong-Youl choi sung-Chul Lim Department of Pathology College of Medicine Chosun University GwangiuKorea Research Center for Resistant Cells College of Medicine Chosun University Gwangju Korea

Persistent hyperinsulinemic hypoglycemia is caused most commonly by an insulinoma in adults or by nesidioblastosis in neonates. In adults, nesidioblastosis is a rare disorder characterized by diffuse or disseminated proliferation of islet cells. we recently encountered a case of nesidioblastosis in an adult. A 71-year-old man was admitted due to intermittent general weakness, abdominal pain, and mild dyspnea. The patient underwent a subtotal gastrectomy for a gastric adenocarcinoma two years ago. After 5 d of admission, the patient showed symptoms of cold sweating, chilling, and hypotension 30 min after eating. Thereafter, he frequently showed similar symptoms accounting for hypoglycemia regardless of food consumption. Laboratory findings revealed a low fasting blood glucose level （25 mg/dL）, and a high insulin level （47 μIU/mL）. selective intra-arterial calcium stimulation with hepatic venous sampling （AsVs） was performed to localize a mass and revealed an increased insulin level about fourfold that of the normal fasting level at 60 s in the splenic artery, which suggested the presence of an insulinoma in the tail of pancreas. A distal pancreatectomy was performed. Neither intraoperative exploration nor a frozen biopsy specimen detected any mass-forming lesion. On the histological examination, many of the islets.w.re enlarged and irregularly shaped in all specimens, the arrangement of which was a Iobulated islet pattern. Cytologically, a considerable subpopulation of endocrine cells showed enlarged and hyperchromatic nuclei. By immunohistochemistry, the cells.w.re identified as p-cells. These clinical, radiological, microscopic and immuno-histochemical findings are consistent with diffuse nesidioblastosis in adults.

关键词： Hyperinsulinemic hypoglycemia Nesidioblastosis Adult

Current status of the KsTAR Engineering

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Plasma science and Technology 2004年第1期6卷 2159-2165页

作者： J.s.Bak K.Kim C.H.choi Y.K.Oh B.C.Kim N.I.Her H.L.Yang G.s.Lee the KsTAR Team Korea Basic science Institute 52 Yeoeun-Dong Yusung-Ku Daejeon 305-333 KoreaKorea Basic Science Institute 52 Yeoeun-Dong Yusung-Ku Daejeon 305-333 KoreaKorea Basic Science Institute 52 Yeoeun-Dong Yusung-Ku Daejeon 305-333 KoreaKorea Basic Science Institute 52 Yeoeun-Dong Yusung-Ku Daejeon 305-333 KoreaKorea Basic Science Institute 52 Yeoeun-Dong Yusung-Ku Daejeon 305-333 KoreaKorea Basic Science Institute 52 Yeoeun-Dong Yusung-Ku Daejeon 305-333 KoreaKorea Basic Science Institute 52 Yeoeun-Dong Yusung-Ku Daejeon 305-333 KoreaKorea Basic Science Institute 52 Yeoeun-Dong Yusung-Ku Daejeon 305-333 KoreaKorea Basic Science Institute 52 Yeoeun-Dong Yusung-Ku Daejeon 305-333 Korea

As there is substantial progress in the KsTAR tokamak engineering, all themajor structures and sub-systems are under fabrication and in procurement phase. The vacuum vessel,port, cryostat cylinder, lid, and bellows are being rigorously fabricated in the factory. The lowerpart of the KsTAR such as cryostat base and gravity support has been almost finished in itsfabrication. There are also great progresses and significant results in manufacturing of thesuperconducting magnet, including four Toroidal Field (TF) coils, lower and upper PF7 coils.w.ichare the largest Poloidal Field (PF) coils. The TFOO coil, which has been made for test and back-upof the TF magnet system, was successfully tested in the cool-down and current charging. As thefabrications and procurements of major structures have been actively proceeded, assembly works.w.realso launched from Aug. 2003. More detailed description on these status, results, and plans.w.ll bedescribed in this paper.

关键词： KsTAR tokamak vacuum vessel magnet cryostat tokamak assembly

PIR-based data integrity verification method in sensor network

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Journal of Central south University 2014年第10期21卷 3883-3888页

作者： Yong-Ki Kim Kwangnam choi Jaesoo Kim JungHo seok Korea Institute of science and Technology Information 245 DaehangnoYuseong Daejeon 305-806 Korea

since a sensor node handles.w.reless communication in data transmission and reception and is installed in poor environment, it is easily exposed to certain attacks such as data transformation and sniffing. Therefore, it is necessary to verify data integrity to properly respond to an adversary's ill-intentioned data modification. In sensor network environment, the data integrity verification method verifies the final data only, requesting multiple communications. An energy-efficient private information retrieval(PIR)-based data integrity verification method is proposed. Because the proposed method verifies the integrity of data between parent and child nodes, it is more efficient than the existing method which verifies data integrity after receiving data from the entire network or in a cluster. since the number of messages for verification is reduced, in addition, energy could be used more efficiently. Lastly, the excellence of the proposed method is verified through performance evaluation.

关键词： data integrity verification private information retrieval sensor network

Retraction control of motorized seat belt system with linear state observer

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Journal of Central south University 2013年第2期20卷 385-392页

作者： LEE Kang-seok choi Chin-chul LEE woo-taik Department of Control and Instrumentation Engineering Changwon National University

A design and verification of linear state observers.w.ich estimate state information such as angular velocity and load torque for retraction control of the motorized seat belt (MsB) system were described. The motorized seat belt system provides functions to protect passengers and improve passenger's convenience. Each MsB function has its own required belt tension which is determined by the function's purpose. To realize the MsB functions, state information, such as seat belt winding velocity and seat belt tension are required. Using a linear state observer, the state information for MsB operations can be estimated without sensors. To design the linear state observer, the motorized seat belt system is analyzed and represented as a state space model which contains load torque as an augmented state. Based on the state space model, a linear state observer was designed and verified by experiments. Also, the retraction control of the MsB algorithm using linear state observer was designed and verified on the test bench. with the designed retraction control algorithm using the linear state observer, it is possible to realize various types of MsB functions.

关键词： motorized seat belt system motorized seat belt (MsB) system linear state observer state space model augmented state retraction control

Numerical characterization of heat transfer in closed-loop vertical ground heat exchanger

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science China(Technological sciences) 2010年第1期53卷 111-116页

作者： Chulho LEE Hujeong GIL Hangseok choi shin-Hyung KANG school of Civil Environmental and Architectural EngineeringKorea University5-GaAnam-DongSeongbuk-GuSeoul 136-713Republic of Korea Pyungsan sI Co. Ltd.1337-31 Seocho-DongSeocho-GuSeoul 137-860Republic of Korea Department of Mechanical Engineering Konyang University119Deahak-RoNonsanChungnam 320-711Republic of Korea

A series of numerical analyses has been performed on the characteristics of heat transfer in a closed-loop vertical ground heat exchanger(U-loop).A 2-D finite element analysis.w.s conducted to evaluate the temperature distribution over the cross section of the U-loop system involving high-density polyethylene(HDPE) pipe/grout/soil to compare the sectional efficiency between the conventional U-loop and a new latticed HDPE pipe system,which is equipped with a thermally insulating lattice in order to reduce thermal interference between the inlet and outlet *** addition,a 3-D finite volume analysis(FLUENT) was adopted to simulate the operation of the closed-loop vertical ground heat exchanger with the consideration of the effect of a distance between the inlet and outlet pipes,grout's thermal properties,the effectiveness of the latticed HDPE pipe system,and the rate of circulation *** was observed that the thermal interference between the two strands of U-loop is of importance in enhancing efficiency of the ground heat ***,it is recommended to modify the configuration of the conventional U-loop system by equipping the thermally insulating lattice between the two pipe strands.

关键词： ground heat exchanger HDPE pipe latticed pipe sectional efficiency

Endoplasmic reticulum stress-induced accumulation of VAMP721/722 requires CALRETICULIN 1 and CALRETICULIN 2 in Arabidopsis

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Journal of Integrative Plant Biology 2019年第9期61卷 974-980页

作者： soohong Kim Yunjin choi Chian Kwon Hye sup Yun Department of Molecular Biology Dankook UniversityCheonan 31116Korea Department of Biological sciences Konkuk UniversitySeoul 05029Korea

Excessive demand for translation and protein folding in the endoplasmic reticulum(ER) can cause ER stress in plants. Here, we show that CALRETICULIN 1(CRT1) and CRT2 are critical components in the accumulation of VEsICLE-AssOCIATED MEMBRANE PROTEIN 721(VAMP721) and VAMP722 during ER stress responses. we show that CRT2 interacts.w.th VAMP722 and that CRT1/2 post-translationally maintain elevated VAMP721/722 levels under ER *** greater growth inhibition in VAMP721/722-deficient plants, induced by tunicamycin, suggests that plants under ER stress maintain physiological homeostasis, at least in part, by regulating VAMP721/722 levels, as VAMP721/722 are known to participate in various biological processes.

关键词： Endoplasmic reticulum VAMP721/722 in Arabidopsis