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전기/하이브리드 자동차, UPS 등에 적용 가능한 환전류 회로를 갖는 새로운 방식의 절연형 DC-DC 컨버터
고재수 ( Jae Su Ko ),조은석 ( Eun Seok Cho ),이용근 ( Yong Keun Lee ) (사)한국전시산업융합연구원 2015 한국과학예술융합학회 Vol.19 No.-
Full-bridge, Push-Pull, Flyback and Forward converters are generally used for electronic/hybrid car and UPS(Uninterrupted Power Supply). In this paper, we proposed novel Full-bridge, Push-Pull,Flyback and Forward converters. In the design topologies, the proper inductor was added in order to make the circulating current even during dead time period, so that we can achieve the better properties such as higher efficiency, cheaper price, with same output properties as the conventional converters. The proposed topologies simulated by PSpice.
친환경 자동차, 대용량 조명장치 등에 적용이 가능한 전력변환장치(다상 교호 강압 컨버터)의 특성에 대한 연구
고재수 ( Jae Su Ko ),조은석 ( Eun Seok Cho ),이용근 ( Yong Keun Lee ) (사)한국전시산업융합연구원 2014 한국과학예술융합학회 Vol.18 No.-
A step-down non-isolated Buck converter is a common and basic topology in the field. We analyzed the Characteristic of Multiphase Interleaved Buck Converter in DCM(Discontinuous Current Mode) and CCM(Continuous Current Mode) for law ripple and high efficiency1). Multiphase buck converter has more advantages than other topology. Input current of converter is divided into each converters because of the structure. it has features of decreasing input current ripple and increasing efficiency of converter. So we can reduce the size of Capacitor and Inductor2). It means that the size of system is also reduced3). The Time Reverse Recovery loss of diode was also affected4)5), the TRR loss was confirmed to be negligible in the 120kHz 8 Phase case despite the CCM situation. In this study, the effects of the loss factors were analyzed on the efficiency of the multiphase interleaving buck converter in DCM and CCM, and it would be helpful to design a more efficient converter by effectively controlling the factors of each loss. At least, we tested the performance of the analyzed system with PSpice.
Ko, Jae Su(고재수),Cho, Eun Seok(조은석),Lee, Yong Keun(이용근) 한국전시산업융합연구원 2014 한국과학예술융합학회 Vol.18 No.-
A step-down non-isolated Buck converter is a common and basic topology in the field. We analyzed the Characteristic of Multiphase Interleaved Buck Converter in DCM(Discontinuous Current Mode) and CCM(Continuous Current Mode) for law ripple and high efficiency1). Multiphase buck converter has more advantages than other topology. Input current of converter is divided into each converters because of the structure. it has features of decreasing input current ripple and increasing efficiency of converter. So we can reduce the size of Capacitor and Inductor2). It means that the size of system is also reduced3). The Time Reverse Recovery loss of diode was also affected4)5), the TRR loss was confirmed to be negligible in the 120kHz 8 Phase case despite the CCM situation. In this study, the effects of the loss factors were analyzed on the efficiency of the multiphase interleaving buck converter in DCM and CCM, and it would be helpful to design a more efficient converter by effectively controlling the factors of each loss. At least, we tested the performance of the analyzed system with PSpice.
가족기능성과 학교적응유연성의 관계에서 청소년 스마트폰 중독의 매개효과 검증
고재수(Jae-Soo Ko) 한국콘텐츠학회 2014 한국콘텐츠학회논문지 Vol.14 No.6
본 연구는 가족기능성과 스마트폰 중독이 학교적응 유연성에 미치는 영향과 스마트폰 중독이 매개효과를 가지는지를 알아보기 위해 구조방정식 모형을 사용하여 검증하였다. 조사대상자는 부산지역 초등 5, 6학년과 중학교 1, 2, 3학년을 대상으로 설문지를 통해 자료를 수집하였으며, 자료수집 기간은 2013년 3월 한 달 동안 이루어졌다. 연구결과, 가족기능성은 스마트폰 중독에 부적(-)영향을, 학교적응 유연성에는 정적(+)영향을 미치는 것으로 나타났으며, 스마트폰 중독은 가족기능성과 학교적응 유연성 간의 관계에서 부분매개 효과를 가지는 것으로 나타났다. 이러한 연구결과를 중심으로 청소년 스마트폰 중독에 대한 사회적 관심제고를 위한 방안과 함께 스마트폰 중독의 예방 및 치료적 개입을 위한 가정 및 학교에 대한 개입 방안을 제언하였다. This study aims to examine the effects of adolescents’ family function and School adjustment resilience on smartphone addiction through verification using the structural equation model. To attain the goal, the study collected data through a survey to elementary school fifth and sixth graders and middle school students living in Busan during March in 2013. The result of this study shows that family function exerts negative effects on smartphone addiction and positive effects on school adjustment resilience. And smartphone addiction is found to show partial mediating effect sin the relations between family function and school adjustment resilience. Based on the above results of this study, the paper suggests measures to enhance social interest in adolescent smartphone addiction and also methods to prevent smartphone addiction and intervene with families and schools for therapeutic intervention.
Novel isolate DC-DC converters with current circulating circuit for electronic/hybrid car and UPS
Ko, Jae Su(고재수),Cho, Eun Seok(조은석),Lee, Yong Keun(이용근) 한국전시산업융합연구원 2015 한국과학예술융합학회 Vol.19 No.-
Full-bridge, Push-Pull, Flyback and Forward converters are generally used for electronic/hybrid car and UPS(Uninterrupted Power Supply). In this paper, we proposed novel Full-bridge, Push-Pull, Flyback and Forward converters. In the design topologies, the proper inductor was added in order to make the circulating current even during dead time period, so that we can achieve the better properties such as higher efficiency, cheaper price, with same output properties as the conventional converters. The proposed topologies simulated by PSpice.
명나혜,고재수,하창원,조경자,장자준,Myong, Na-Hye,Ko, Jae-Soo,Ha, Chang-Won,Cho, Kyung-Ja,Jang, Ja-June 대한세포병리학회 1992 대한세포병리학회지 Vol.3 No.1
It is very rare to diagnose a squamous cell carcinoma when the carcinoma cells are observed in various body fluids. The effusion cytology of squamous cell carcinoma has not been sufficiently studied till now. We examined 10 cases of body fluid cytologic specimen diagnosed as metastatic squamous ceil carcinoma, which were selected among 2,100 body fluid cytology cases collected from 1986 to 1991. The patients had been confirmed to have primary squamous ceil carcinomas. The backgrounds of cellular aspirates were necrotic in most and the cells appeared in clusters or individually. The cell clusters showed round and smooth margins, mimicking adenocarcinoma, but in flat sheets rather than three-dimensional bails. the individual cells were most frequently Graham's 3rd-type cells, found in all cases, which were described as 1.5 times large as the parabasal cells and having small cytoplasmic rims. Other malignant squamous cells were undifferentiated cells, polygonal cells, fiber cells, and tadpole cells with decreasing order of frequency. The recognition of various features of malignant squamous cells would be helpful for the diagnosis of squamous ceil carcinoma found in effusion cytology.
박광서(Kwang-So PARK),고재수(Jea-Soo KO) 한국무역상무학회 2018 貿易商務硏究 Vol.79 No.-
The export support systemis a set of programs provided by the government and trade promotion agencies to support the export of less competitive SME companies. Korea s export support system for SME has achieved remarkable results in terms of quantitative terms, and is now in need of qualitative improvement. This study looked at the problems of the existing export support system in the new trade environment of the 4th Industrial Revolution and new-protection trade policy and proposed improvement measures. We studied the problems as follows; First, we have insufficient export support experts due to a lack of awareness among the CEO and their workers. Second, the systems have been focused on the domestic manufacturers instead of traders over the past two decades. Third, the new export support systemin consideration of the changing trade environment is still not enough. Fourth, the objective evaluation of export support system is insufficient, making efficient use of resources insufficient. We proposed improvement measures as follows; First, we should trained an expert or a master of export support based on the awareness of CEO and workers in the trade promotion agency. Second, we should take policy consideration for the trading companies as beneficiaries of the export support system. Third, a new export support system should be adopted suitable for trade in service, B2C, CBEC, according to the era of the 4th Industrial Revolution. Fourth, the current export support systems should be evaluated objectively and re-adjusted by using product life cycle theory or portfolio strategy etc.
The Research of Bi-Directional step up-down simple H-bridges inverter for Green Car or Light System
Cho, Eun Seok(조은석),Ko, Jae Su(고재수),Lee, Yong Keun(이용근) 한국전시산업융합연구원 2014 한국과학예술융합학회 Vol.18 No.-
The inverter is widely used for the Green car and High Power Light System. Conventional sinusoidal Inverter(DC-AC conversion system) has a power loss from the wrongly controled switching device due to their own falling and rising time1)2). In this paper, we propose the new method to add the proper dead time and which can work for step down operation. Especially, bi-directional operation is necessary for electronic(hybrid)car and UPS system. For this purpose we propose the novel control method for step-up operation when it works for AC-DC operation without additional converter only using H-Bridge inverter.