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Production of germline chimeric quails following spermatogonial cell transplantation in busulfan-treated testis

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Asian Journal of Andrology 2018年第4期20卷 414-416页

作者： Young Min Kim Jin Se park Jong Won Yoon Hee Jung Choi kyung je park Tamao Ono Jae Yong Han Department of Agricultural Biotechnology Research Institute of Agriculture and Life Sciences College of Agriculture and Life Sciences Seoul National University Seou108826 Korea Division of Animal Science Faculty of Agriculture Shinshu University Minamiminowa Nagano 399-4598 Japan Institute for Biomedical Sciences Shinshu University Minamiminowa Nagano 399-4598 Japan

Dear Editor, The merits of using quaff as an avian experimental model include high egg production, low maintenance cost, small body size, and short generation period （approximately 6-8 weeks）. Indeed, these characteristics make quail an ideal species for many biological areas including transgenic research. Methods of primordial germ cell （PGC）-mediated germline chimera production are considered very reliable and have been used in avian transgenesis.

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Influence of tool deflection on micro channel pattern of 6:4 brass with rectangular tool

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中国有色金属学会会刊：英文版 2009年第B9期19卷 164-170页

作者： Tae-Jin je Kang-Won LEE Sang-Cheon park Jae-Gu KIM Doo-Sun CHOI Kyoung-Taik park kyung-Hyun WHANG Nano Mechanical Systems Research Division Korea Institute of Machinery & Materials (KIMM)

Machining experiment of micro channel structure with 6:4 brass was carried out by shaping process using a single crystal diamond tool. FEM simulation using solid cantilever beam model was analyzed. In result of experiment, tool deflection is observed as machining characteristics through result of experiments such as surface roughness, cutting force and burr formations. And the influence of tool deflection is experimentally proved.

关键词：金刚石工具挠度通道模式黄铜矩形实验证明加工特性有限元模拟

Inverse Problem of Flame Surface Properties of Wood using a Repulsive Particle Swarm Optimization Algorithm

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Journal of Thermal Science 2015年第2期24卷 173-178页

作者： kyung-Beom Yoon Won-Hee park Korea Conformity Laboratories 199Gasan-digital 1-roGeumcheon-guSeoul 153-803Korea Korea Railroad Research Institute 176 Cheoldobangmulgwan-roUiwang-siGyeonggi-do 437-757Korea Korea University of Science and Technology (UST) 217 Gajeong-roYuseong-guDaejeon 305-350 Korea

The convective heat transfer coefficient and surface emissivity before and after flame occurrence on a wood specimen surface and the flame heat flux were estimated using the repulsive particle swarm optimization algorithm and cone heater test results. The cone heater specified in the ISO 5660 standards was used, and six cone heater heat fluxes were tested. Preservative-treated Douglas fir 21 mm in thickness was used as the wood specimen in the tests. This study confirmed that the surface temperature of the specimen, which was calculated using the convective heat transfer coefficient, surface emissivity and flame heat flux on the wood specimen by a repulsive particle swarm optimization algorithm, was consistent with the measured temperature. Considering the measurement errors in the surface temperature of the specimen, the applicability of the optimization method considered in this study was evaluated.

关键词： Repulsive particle swarm optimization Cone calorimeter Flame heat flux Flame surface properties

Optimization of Pyrolysis Properties using TGA and Cone Calorimeter Test

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Journal of Thermal Science 2013年第2期22卷 168-173页

作者： Won-Hee park kyung-Beom Yoon Eco-Transport Systems Research Division Korea Railroad Research Institute Department of Mechanical Engineering Chung-Ang University

The present paper describes an optimization work to obtain the properties related to a pyrolysis process in the solid material such as density, specific heat, conductivity of virgin and char, heat of pyrolysis and kinetic parameters used for deciding pyrolysis rate. A repulsive particle swarm optimization algorithm is used to obtain the pyrolysis-related properties. In the previous study all properties obtained only using a cone calorimeter but in this paper both the cone calorimeter and thermo gravimetric analysis (TGA) are used for precisely optimizing the pyrolysis properties. In the TGA test a very small mass is heated up and conduction and heat capacity in the specimen is negligible so kinetic parameters can first be optimized. Other pyrolysis-related properties such as virgin/char specific heat and conductivity and char density are also optimized in the cone calorimeter test with the already decided parameters in the TGA test.

关键词： Pyrolysis properties Thermogravimetric analysis Cone calorimeter Repulsive particle swarmoptimization

Improvement of machining quality of copper-plated roll mold by controlling temperature variation

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Transactions of Nonferrous Metals Society of China 2011年第A1期21卷 37-41页

作者： Tae-Jin je Eun-Chae jeON Sang-Cheon park Doo-Sun CHOI kyung-Hyun WHANG Myung-Chang KANG Division of Nano-Mechanical Systems Korea Institute of Machinery and Materials Daejeon 305-343 Korea National Core Research Center for Hybrid Materials Solution Pusan National University

Micro prism film used in LCD industry can be manufactured by roll to roll method with copper-plated roll mold. As copper-plated roll mold is getting larger, pitch error is getting severer. The pitch error drops the quality of micro prism film. The main cause of the pitch error was investigated during machining large roll mold whose machined length was 1 200 mm. The temperature of machining system was elevated during machining roll mold, and this elevation induced thermal expansion of the system. The temperature variation around the roll mold also made thermal expansion of the roll mold. The amount of thermal expansion had strong relationship to the amount of pitch error. Therefore, the roll mold was machined after warming-up of machining system and precise temperature controller around copper-plated roll mold was installed, which minimized the temperature variation. Finally, precise micro prism patterns without pitch error were machined on the large roll mold.

关键词： copper-plated roll mold machining prism pattern temperature variation

Effect of Fe_2P in LiFePO_4/Fe_2P composite on electrochemical properties synthesized by MA and control of heat condition

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Rare Metals 2006年第Z2期25卷 179-183页

作者： park Jong Suk LEE kyung Tae LEE kyung Sub Department of Material Science and Engineering Hanyang University Seoul 133-731 Korea

In order to control the size and distribution of the high conductive Fe2P in LiFePO4/Fe2P composite, two different cooling rates (Fast: 15 ℃·min-1, Slow: 2 ℃·min-1) were employed after mechanical alloying. The discharge capacity of the fast cooled was 83 mAh·g-1 and the slow cooled 121 mAh·g-1. The particle size of the synthesized powder was examined by transmission electron microscopy and distribution of Fe2P was characterized using scanning electron microscopy (SEM). In addition, two-step heat treatment was carried out for better distribution of Fe2P. X-ray diffraction (XRD) and Rietveld refinement reveal that LiFePO4/Fe2P composite consists of 95.77% LiFePO4 and 4.33% of Fe2P.

关键词： LiFePO4/Fe2P composite mechanical alloying heat treatment discharge capacity

The effectiveness of emotion-focused art therapy on the resilience and self-image of emergency physicians

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World Journal of Emergency Medicine 2022年第6期13卷 479-484页

作者： Soo kyung Eo Chanwoong Kim kyung Hye park Eun kyung Eo Graduate School of Art Therapy at CHA University Pocheon 11160Republic of Korea Department of Emergency Medicine Chung-Ang University College of MedicineSeoul 06974Republic of Korea Department of Medical Education Yonsei University Wonju College of MedicineWonju 26426Republic of Korea Department of Emergency Medicine Wonju Severance Christian HospitalWonju 26426Republic of Korea Department of Emergency Medicine Soonchunhyang University Bucheon HospitalBucheon 14584Republic of Korea

INTRODUCTION Resilience refers to the quality of being able to overcome adversity.[1]Studies conducted in the United States[2]and China[3]following the 2019 coronavirus disease(COVID-19)pandemic reported reduced resilience levels among medical *** resilience levels are associated with low burnout levels among residents.[4]Physician burnout affects patients’safety and quality of care.[5]In particular,emergency physicians(EPs)are more prone to exhaustion or poor resilience,as their turnover intention tends to be higher.[6]Therefore,improving EPs’resilience is imperative.

关键词： image physician overcome

Radiologic factors related to double-bar insertion in minimal invasive repair of pectus excavatum

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World Journal of Pediatrics 2015年第2期11卷 148-153页

作者： Ki Hwan Kim Ki Yeol Lee Jung Bok Lee kyung-Sook Yang Jinwook Hwang Bo kyung je Hyung Joo park Department of Radiology Korea University College of MedicineAnsanKorea1 Department of Clinical Epidemiology and Biostatics Asan Medical CenterUniversity of Ulsan College of MedicineSeoulKorea Department of Biostatistics Korea University College of MedicineSeoulKorea Departmentof Thoracic Surgery Korea University College of MedicineAnsanKorea Department of Thoracic and Cardiovascular Surgery Seoul St.Mary's Hospitalthe Catholic University of KoreaSeoulKorea

Background:Pectus excavatum is the most common congenital chest wall deformity,with a high incidence in live *** study aimed to evaluate the measured factors on CT images related to the number of pectus bars for surgical ***:A total of 497 patients who had undergone minimally invasive repair between April 2007 and July 2011 were classified into single-bar(n=358)and doublebar(n=139)insertion *** measured eight distinct distances and one angle on CT scans to reflect quantitative *** analysis and multivariate logistic regression analysis were performed to detect statistically significant association between radiologic measurements and the pectus bars ***:After adjusting for age and gender,the transverse distance(T),the transverse distance of the depression area(A),the inclined distance of the depression area(B),the AP distance of the depression area(C),the depression angle(G),and the eccentric distance of deformity(E)were significantly correlated with double-bar *** regression model showed that age(,P<0.0001),gender(P<0.0001),depression angle(G)(P<0.0001),direction of the depression(DD)(P<***1)and depression depth(D)(P<0.0001)were significantly associated with doublebar ***:CT scan provides useful factors which can be of assistance in predicting the number of pectus bars for the surgical correction of pectus excavatum.

关键词： computed tomography Nuss procedure pectus excavatum

Machining characteristics of complex prism pattern on electroplated roll by copper

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中国有色金属学会会刊：英文版 2009年第B9期19卷 288-294页

作者： Tae-Jin je Sang-Cheon park Kang-Won LEE Yeong-Eun YOO Doo-Sun CHOI kyung-Hyun WHANG Myung-Chang KANG Nano-Machining Laboratory Division of Nano-Mechanical Systems Korea Institute of Machinery and Materials Nano-Mechatronics Department University of Science and TechnologySinseongnoYouseong-GuDaejeonKorea National Core Research Center for Hybrid Materials Solution Pusan National University

The BLU (back light unit) is the core component of the LCD for notebook, mobile-phone, navigation, as well as large sized TV, PID (public information display), etc. In order to enhance optical efficiency of LCD, optical films with the uniform prism patterns have been used for BLU by stacking two films up orthogonally. In this case, light interference-phenomenon occurred such as Morie, wet-out, u-turning, etc. It caused several problems such as low brightness, spots and stripes in LCD. Recently, the high-luminance micro complex prism patterns are actively studied to avoid the light interference-phenomenon and enhance the optical efficiency. In this study, the roll master to manufacture complex micro prism pattern film was machined by using the high precision lathe. The machined patterns on the roll master were 50, 45, 40, 35, 30, 25, 20, 15, 10 and 5 μm in the pitch with 25.0, 22.5, 20.0, 17.5, 15.0, 12.5, 10.0, 7.5, 5.0 and 2.5 μm in the peak height, respectively. The roll was 2 000 mm in length and 320 mm in diameter. The electroplated roll by copper and the natural single crystal diamond tool was used for machining the patterns. The cutting force was measured and analyzed for each cutting condition by using the dynamometer. The chips and the surfaces after being machined were analyzed by SEM and microscope.

关键词：车床加工微棱镜铜电镀特征光学效率光学薄膜笔记本电脑金刚石工具