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수요사슬 통합전략에 영향을 미치는 동인에 관한 연구: 지능형 협업 사례 분석
김철수(Chulsoo Kim),김연태(Yon Tae Kim) 한국지능정보시스템학회 2004 지능정보연구 Vol.10 No.2
The collaboration between businesses in a demand chain has three layers: Integration. Exchange, and Synchronize. The latter the layer is, the stronger the collaboration gets. This paper investigated drivers influencing intelligent demand chain integration strategy (supply integration, demand integration, demand chain integration) in Korea manufacturing and services. The drivers are classified into two types: rational efficiency driven and bandwagon driven. We find the differences in the characteristics of drivers affecting the strategies. Besides, this study suggests the better integration strategy for Korea firms. In conclusion it says that demand integration strategy is chosen to improve efficiency, whereas supply integration strategy is influenced by external pressure.<br/>
하이브리드 자동차의 직류변환장치(LDC) 성능 및 신뢰성 평가에 대한 연구
김철수(Chulsoo Kim),박광민(Gwangmin Park),지성원(Sungwon Ji),김찬중(Chanjung Kim),이봉현(Bonghyun Lee) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
Low DC-DC converter(LDC) in HEV plays a role in charging the auxiliary battery as a low voltage from the main battery charged to the electric driving motor"s regenerative energy during deceleration and braking of the vehicle. The charged auxiliary battery supplies power to the electronics such as headlamps, air conditioner, power windows, and electric power steering. LDC"s output of degradation and failure in the vehicle can have severe impact on various electronics during driving. LDCs for HEVs compared to general industrial DC-DC converters need to meet the performance of high-efficiency power conversion, vibration, and heat resistance properties and EMI to ensure the reliability within the limited volume to be mounted in the vehicle. In this paper, reliability assessment and performance evaluation factor are established for developing the LDC in HEV. Also the performance testing and analysis about the conventional LDC currently used in a HEV is performed on the status of the vehicle and device. The result will be uesd to compare the developed LDC"s performance.