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홍관이,이광재,김두경,부기원,노성규,한상준,박기동,오수일,문병용,이철규,박장평,엄기진,박남환 江原大學校附設 體育科學硏究所 1984 江原大學校附設體育科學硏究所論文集 Vol.- No.9
This study is designed to grasp the elements and situations of stage fright in order to propose a part of ways to cope with it. We make 511 top-class high school players, male and female, in the central districts (Seoul, Inchon, Kyungki, Chungbuk, and Kangweon Province) on object of questionnaire, and get the following results. Through players generally have all-round characters they show weakness in the superiority and emotional stability while showing strength in the sonformity. This fact comes to be related to the elements which cause stage fright. Physiological changes also have many effects on the symptom of stage fright. Especially, stage fright increases when players show sensitive reaction to the self-consciousness of final consequence which comes from the tension or uneasiness of sympathetic nerve, Thus, it turns out that players make use of reducing psychological burden by physical exercise or adjusting the level of demanded result in order to release the stage fright.
Development of High Functional Black Resin Coated Electrogalvanized Steel Sheet for Digital TV Panel
( Du Hwan Jo ),( Moon Jae Kwon ),( Jae Hva Lee ),( Hee Seung Kang ),( Yongn Gvun Jung ),( Von Kvun Song ),( Min Hwan Jung ),( Soon Hvoun Cho ),( Veong Bong Cho ),( Myoung Rae Cho ),( Byoung Chon Cho ) 한국부식방식학회(구 한국부식학회) 2013 Corrosion Science and Technology Vol.12 No.1
Recently Digital TV industry has drastically been moving the illuminating system, which causes an obvious product change from PDP and LCD to LED model to provide high-definition image. Due to strong competition in the digital industry. TV manufacturers make a great efforts to reduce production cost by using low-priced materials such as steels instead of aluminum and plastic etc. In this paper we have developed a new low-priced electrogalvanized steel sheet, which has a black resin composite layer, to substitute conventional high-priced PCM steel and plastic mold for rear cover panel in the digital TV. The black resin composite was prepared by mechanical dispersion of the mixture solution that consists of high solid polyester resin, melamine hardener, black pigment, micronized silica paste, polyacrylate texturing particle and miscellaneous additives. The composite solution was coated on the steel sheet using roll coater followed by induction furnace curing and cooling. Although the coated layer has a half thickness compared to the conventional PCM steels having 23tn thickness, it exhibits excellent quality for the usage of rear cover panel. The new steel sheet was applied to test products to get quality certification from worldwide electronic appliance customers. Detailed discussion provides in this paper including preparation of composite solution, roll coating technology, induction curing technology and quality evaluation from customers.
Corrosion Resistance of Mg-Added Galvannealed Steel Sheets with Nano-Composite Coating
( Du-hwan Jo ),( Sang-man Yun ),( Doo-jin Paik ),( Myung-soo Kim ),( Moon-hi Hong ) 한국부식방식학회(구 한국부식학회) 2020 Corrosion Science and Technology Vol.19 No.2
As competition among global automakers intensifies, demand for materials that are better in price and performance is increasing. While steel and plastic materials compete for automotive fuel tanks, plastic materials have advantages such as light weight for automobiles. However, they have high prices. Accordingly, in this paper, four types of Zn-X plated steel sheets, electroplating (X = none, Sn) and galvannealed (X = Fe, Fe-Mg), were manufactured and their applicability as a fuel tank material was evaluated. Nano-composite coating solution with good conductivity was treated on the surface of plated steels using a roll coater and then cured through induction furnace to improve corrosion resistance. Quality characteristics such as corrosion resistance, fuel resistance to diverse gasoline and diesel fuels, and seam weldability were evaluated for the above plated steels. Their properties were compared and analyzed with conventional Zn-Ni electroplating steels. Among the above plated steels, Zn-Fe-Mg galvannealed steels coated with nano-composite coating exhibited better properties than other steels. Detailed experimental results suggest that evenly distributed Mg elements on the coating layer play a key role in the enhanced quality performance.
Chromate-free Hybrid Coating for Corrosion Protection of Electrogalvanized Steel Sheets
( Du Hwan Jo ),( Moon Jae Kwon ),( Jong Sang Kim ) 한국부식방식학회(구 한국부식학회) 2012 Corrosion Science and Technology Vol.11 No.1
Both electrogalvanized and hot-dip galvanized steel sheets have been finally produced via organic-inorganic surface coating process on the zinc surface to enhance corrosion resistance and afford additional functional properties. Recently, POSCO has been developed a variety of chromate-free coated steels that are widely used in household, construction and automotive applications. New organic-inorganic hybrid coating solutions as chromate alternatives are comprised of surface modified silicate with silane coupling agent and inorganic corrosion inhibitors as an aqueous formulation. In this paper we have prepared new type of hybrid coatings and evaluated quality performances such as corrosion resistance, spot weldability, thermal tolerance, and paint adhesion property etc. The electrogalvanized steels with these coating solutions exhibit good anti-corrosion property compared to those of chromate coated steels. Detailed components composition of coating solutions and experimental results suggest that strong binding between organic-inorganic hybrid coating layer and zinc surface plays a key role in the advanced quality performances.
에너지 저장장치를 갖는 고 전력밀도 및 저가격형 태양광 인버터 시스템
금문환(Moon-Hwan Keum),장두희(Du-Hee Jang),홍성수(Sung-Soo Hong),한상규(Sang-Kyoo Han) 전력전자학회 2011 전력전자학술대회 논문집 Vol.2011 No.7
본 논문에서는 고 전력밀도 및 저가형으로 구성 가능한 새로운 구조의 계통 연계형 태양광 인버터 시스템을 제안한다. 제안 시스템은 태양전지의 최대 전력점 추종기능과 배터리의 충ㆍ방전 기능을 단일 전력단으로 구성함으로써, 고 전력밀도 및 저가격형 시스템 구성이 가능하다. 또한, 제안 시스템은 배터리를 링크 캐패시터에 직렬 연결함으로써 링크 캐패시터의 전압 스트레스를 배터리 전압만큼 저감할 수 있으므로 가격저감 효과가 크다. 최종적으로 제안 시스템의 우수성과 신뢰성 검증을 위하여 1.5㎾급 태양광 인버터 시스템의 시작품을 제작하였고, 이를 이용한 실험결과를 바탕으로 제안 시스템의 타당성을 검증한다.
( Seung Hwan Lee ),( Tae Hun Kim ),( Da Jeong Lim ),( Sung Jong Oh ),( Eung Woo Park ),( Yong Min Cho ),( Du Hak Yoon ),( Seong Koo Hong ),( Hyeong Cheol Kim ),( Hee Joo Moon ) 한국동물자원과학회 ( 구 한국축산학회 ) 2010 한국축산학회지 Vol.52 No.6
The bovine fatty acid binding protein 4 (FABP4) plays an important role to uptake intracellular fatty acid. It has been previously reported as a positional candidate gene for marbling score in livestock. The re-sequencing of FABP4 gene detected a polymorphic AT repeated sequence in intron II of FABP4 gene. Allelic distribution for this microsatellite marker was examined in other cattle breeds. A total of 8 alleles were detected with diverse repeat units (14 to 21 AT repeat) in Hanwoo and 7 breeds. Of the 8 alleles, the predominant alleles were [AT]16, [AT]18 and [AT]19 in the Hanwoo and 7 cattle breeds. The linear mixed model for genotypic effect (3237AT) on carcass traits showed a significant effect on marbling score (MAR P=0.025) and live weight (LWT; P=0.04) in the 583 Hanwoo cattle population. Live weight (LW) was highest in the homozygous (AT)17 genotype (557.5±6.94) and lowest in the heterozygous (AT)16/17 genotype (521.7±7.70). On the other hand, the homozygous (AT)17 genotype (3.0±0.15) has the highest effect on marbling score and the lowest effect was in homozygous (AT)18 genotype(2.2±0.15). The marbling score difference between both groups was 0.8 which is around two times higher than SNP genotype effect on marbling score in Limousin×Wagyu crosses.