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- 저자 : 최경식(Kyung Shik Choi) (검색결과 15 건)
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전력저장시스템 기술개발 국외동향 분석 및 국내 활용방안 연구
최경식(Kyung Shik Choi),양승권(Seung Kwon Yang) 한국조명·전기설비학회 2008 한국조명·전기설비학회 학술대회논문집 Vol.2008 No.10월
As the technology of a large scale battery have advanced, it’s application to the electric power network have been active in foreign country. By providing the electric wop energy stored in the electric power storage system when needed, there are many advantages that it is able to reduce the gap between the electric power demand and supply for day and night to increase capacity factor, to upgrade the electric power quality degraded from the unbalance between power demand and supply and to compensate the fluctuation of wind wop plant and photovoltaic power generation. In this study, the current application of electric wop storage system using battery is introduced in detail, and I have thought out it's application fields based on the foreign examples. These are demand side response, upgrade of the wop quality, stabilization of fluctuation of renewable energy and distributed generation for filling elapse.
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최경식(Kyung Shik Choi),송동수(Dong Su Song),박신열(Shin Yeol Park),이경수(Kyung Su Lee) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.10
주상변압기의 고장 요인으로 절연파괴가 많은 부분 차지하고 있으며 절연파괴 원인으로 변압기 부싱 개스킷을 통한 수분침투와 절연유 누유가 주 원인이 다 수분침투와 절연유 누유의 주 원인은 개스킷 재질의 열화이며 변압기의 설계수명까지 개스킷의 건정성을 유지하기 위해 열화에 강한 개스킷 재질 선정이 중요하다 열화에 강한 고무재질을 평가하기위해 현재 규격에서 정하고있는 NBR과 대체 가능 재질인 HNBR에 대해 가속열화 수명시험을 하였으며 Arrhenius plot 방식에의 한 활성화 에너지는 NBR과 HNBR이 89.0 kj/mole 84.4 kj/mole로 나타났으며 변압기 사용 온도에서 NBR, HNBR 수명을 평가하였다.
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2010남아공월드컵 우승팀의 패스유형 및 패스 성공률에 관한 비교분석
최경식(Kyung Shik Choi),이현정(Hyun Jung Lee) 한국여성체육학회 2012 한국여성체육학회지 Vol.26 No.4
The main objective of this study was to compare the factors regarding the type of pass and its success rate between the winners of the 2010 World Cup in South Africa and other teams. Seven games conducted by 14 teams were analyzed for this study. Images provided by FIFA Media Channel observed and Mann-Whitney U method was used for statistical analyses by Program SPSS10.0. First, there was no difference in pass frequency or success between winner team and opposing teams. Second, in the path distance, winning team presented more medium-range pass; however, others presented more short-range pass. Third, in the pass in the direction, both made forward pass compared to other pass. Fourth, in the pass frequency region, winning team presented higher success rate in all region. Lastly, winning team presented higher shooting frequency than others. In conclusion, winning team has higher successes on pass frequency and pass success rate, therefore the focus to improve shooting success rate should be considered.
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Diaminotetrabromophenoxycyclotriphosphazene에 의한 에폭시수지의 경화와 열적 성질
윤흥수,최경식,Yoon, Heung-Soo,Choi, Kyung-Shik 한국섬유공학회 1996 한국섬유공학회지 Vol.33 No.7
1, 1-diamino-3, 3, 5, 5-tetra-(p-bromophenoxy)cyclotriphosphazene(ABPP) was prepared from hexachlorocyclotriphosphazene and used for the curing agent of a bisphenol A type epoxy resin(EPIKOTE 828). The effect of the curing agent on the dynamic viscoelastic properties and heat resistance of the cured epoxy resins were investigated and compared with those for the epoxy resins cured with 1, 1-diamino-3, 3, 5, 5-tetraphenoxycyclotriphosphazene(APP), 1, 1-diamino-3, 3, 5, 5-tetra-(2, 2, 2-trifluoroethoxy)cyclotriphosphazene(AFEP), 1, 3, 5-trichloro-1, 3, 5-tridimethylaminocyclotriphosphazene(Cl3), 1, 1-diamino-3, 3, 5, 5-tetra-(p-chlorophenoxy) cyclotriphosphazene(ACPP), aliphatic amine and aromatic amine. The epoxy resin cured by ABPP showed the highest storage modulus and glass transition temperature on the curing condition of 19$0^{\circ}C$ for 2 hours. The epoxy resins cured with phosphazene derivatives showed superior flame proofing to those of aliphatic amine and aromatic amine. Particularly limit oxygen index of ABPP showed the highest 31.8~34.5. It is an effective curing agent for epoxy resins to enhance the storage modulus and resistance to heat.
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축차이축연신 Poly(vinylidene Fluoride) 필름의 압전성과 역학적 성질
김상용,박철,최경식,Kim, Sang-Yong,Park, Chul,Choi, Kyung-Shik 한국섬유공학회 1989 한국섬유공학회지 Vol.26 No.7
Piezoelectric and mechanical properties of uniaxially and two step biaxially drawn poly(vinylidene fluoride) films were investigated and discussed in terms of morphology. Piezoelectric constants(e31) of two step biaxially drawn films were higher than those of uniaxially drawn films under the same poling conditions(about 0.5MV/cm.) In two step biaxially drawn films, dynamic tensile moduli in the drawing direction were higher than those in perpendicular direction to the drawing direction. Thermal stability of two step biaxially drawn films were better than that of uniaxially drawn films.
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