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Shin, Moo Chul(신무철),Cho, Eun Seok(조은석),Lee, Yong Keun(이용근) 한국전시산업융합연구원 2014 한국과학예술융합학회 Vol.18 No.-
The Boost Converter is basic topology for step up DC-DC Converter. The Boost Converter uses switching device such as MOSFET and IGBT. Every switching devices have body resistances because of their own characteristic and structure. the one of body residences is RD which causes a lot of loss in the power conversion system. Additionally, too high RD causes abnormal operation. In this paper, we analysed the characteristic of boost converter with each various RD situation. Finally, we tested the performance and problem of the analyzed system with PSpice. In order to solve this problem we designed multiphase converter. It will be helpful to design higher performance boost converter with stable operation.
전기/하이브리드 자동차에 적용이 가능한 높은 강압비와 효율을 갖는 3kW급의 절연형 DC-DC 컨버터 설계 방법
신무철(Shin, Moo Chul),조은석(Cho, Eun Seok),정장만(Jung, Jang Man),이용근(Lee, Yong Keun) 한국전시산업융합연구원 2015 한국과학예술융합학회 Vol.19 No.-
본 논문에서는 전기 자동차에 적용 가능한 높은 효율을 갖는 3kW급의 양방향 Inverter, DC-DC Converter를 제안하였다. 제안된 시스템은 입력과 출력을 절연시키기 위한 Full-Bridge Part, 피드백에 의한 전압 조절을 위한 Push-Pull Part, 그리고 Inverter Part로 총 3개의 파트로 구성된다. 고전류 컨버터에서 상당한 손실을 야기하는 인덕터를 저 전류 측으로 옮기고, MOSFET의 개수를 줄임으로써 획기적으로 효율을 증가시켰다. 또한 Full Bridge Part 에서 높은 고정 듀티(Duty)의 Phase Shift 방식을 사용하여 낮은 Turn ON 손실과 낮은 스위치 도통손실을 달성하였다. 추가적으로 기존의 인버터의 스위칭 문제점을 개선하여 적절한 Dead Time을 추가하였으며, 이로 인한 상당한 효율증가를 보여주었다. 제안된 토플로지는 하이브리드(전기)자동차의 전력 변환 시스템이나, 배터리 충·방전 테스트 장비에 효과적으로 적용될 수 있겠다. We proposed 3kW bi-directional inverter and DC-DC converter system with high step down ratio and efficiency in this paper. The proposed system is consisted to 3 parts. The first one is Full-Bridge part to isolate input and output and 2nd part is Push-Pull topology to control the output voltage. The last one is the inverter part to transfer the power from DC to AC. The inductor and MOSFET cause conduction loss especially in high current condition. We moved the inductor to lower current part and decreased the number of MOSFET in high current part to decease power loss. And we decreased power loss by using phase shift switching and add the proper dead time for the inverter part. The proposed system can be used for wide application such as electronic(hybrid) car, BMS and any power transfer system.
친환경 자동차, 발전설비에 적용 가능한 MOSFET 의 RDS(on)특성에 따른 Boost Converter 분석 연구
신무철 ( Moo Chul Shin ),조은석 ( Eun Seok Cho ),이용근 ( Yong Keun Lee ) (사)한국전시산업융합연구원 2014 한국과학예술융합학회 Vol.18 No.-
The Boost Converter is basic topology for step up DC-DC Converter. The Boost Converter uses switching device such as MOSFET and IGBT. Every switching devices have body resistances because of their own characteristic and structure. the one of body residences is RD which causes a lot of loss in the power conversion system. Additionally, too high RD causes abnormal operation. In this paper, we analysed the characteristic of boost converter with each various RD situation. Finally, we tested the performance and problem of the analyzed system with PSpice. In order to solve this problem we designed multiphase converter. It will be helpful to design higher performance boost converter with stable operation.
감신,박재용,채상철,배문섭,신무철,예민해,남시현,Kam, Sin,Park, Jae-Yong,Chae, Sang-Chul,Bae, Moon-Seob,Shin, Moo-Chul,Yeh, Min-Hae,Nam, Si-Hyun 대한예방의학회 2002 예방의학회지 Vol.35 No.1
Objectives : To investigate the therapeutic compliance and its related factors in lung cancer patients. Methods : The subjects of this study comprised 277 patients first diagnosed with lung cancer at Kyungpook National University Hospital between Jan 1999 and Sept 1999. Of these, 141(50.9%) participated in the study by properly replying to structured questionnaires. The data was analyzed using a simplified Health Decision Model. This model includes categories of variables covering therapeutic compliance, health beliefs, patient preferences, knowledge and experience, social interaction, sociodemographic and clinical characteristics. Results : The therapeutic compliance rate of the 141 study subjects was 78.0%. An analysis of health beliefs and patient preferences revealed health concern (p<0.05), dependency on medicine (p<0.05), perceived susceptibility and severity (p<0.05) as well as preferred treatment (p<0.01) as factors related to therapeutic compliance. Factors from the sociodemographic characteristics and clinical factors that were related to therapeutic compliance were age (p<0.01), monthly income (p<0.05), histological type (p<0.05) and clinical stage (p<0.05) of cancer. Conclusions : In order to improve therapeutic compliance in lung cancer patients it is necessary to educate the aged, low-income patients, or patients who have small cell lung cancer or lune cancer of an advanced stage for which surgery is not indicated. Additionally, it is essential for medical personnel to have a deep concern about patients who have poor lifestyles, a low dependency on medicine, or a high perceived susceptibility and severity. Practically, early diagnosis of lung cancer and thoughtful considerations of low-income patients are important. By means of population-based education in a community, we may promote attention to health and enhance the early diagnosis of lung cancer.