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최정필(Jeong Pil Choi),정의승(Eui S. Jung),박성준(Sungjoon Park),정성욱(Seong Wook Jeong) 대한인간공학회 2007 大韓人間工學會誌 Vol.26 No.4
The purpose of this study is to propose an optimal layout for the accelerator and brake pedals in sedan and SUV, and also to compare the pendant-type pedal with organ-type pedal. 12 male subjects participated in the experiment, the subjects were divided into 3 groups according to height percentile(under 50%ile, 50%ile to 75%ile, over 75%ile). Independent variables were seat height (H30), X and Y coordinates of the center of accelerator and brake pedals and the x and y relative distance between two pedals. Dependent variable was subjective ratings for lower body discomfort. The response surface methodology using a central composite design was employed to develop a prediction model for lower body discomfort of each pedal. It is noticeable that the lateral position of the accelerator in all groups was not statistically significant. The optimal locations of both pedals were found to be distinct according to the percentile of subjects. X distance from accelerator to brake of both-type pedals is similar. But Y distance from accelerator to brake of organ-type is less about 2~3㎝ than that of pedant-type.
파이프라인 방식 Baugh - Wooley 승산기의 구현과 성능 분석
한강룡(Kang-Ryong Han),최정필(Jeong-Pil Choi),송호정(Ho-Jeong Song),황인재(In-Jae Hwang),송기용(Gi-Yong Song) 한국정보과학회 2001 한국정보과학회 학술발표논문집 Vol.28 No.2Ⅲ
본 논문에서는 Baugh-Wooley 승산 알고리즘을 ‘8×8-bit 15 stage 파이프라인 배열 승산기’, ‘8×8-bit 2 stage 파이프라인 배열 승산기’, ‘순수 조합 논리 배열 승산기’의 방식으로 FPGA상에서 구현하였으며, 각 구현방식의 성능을 비교 분석하였다.
가변속 냉동시스템의 용량 및 과열도제어를 위한 퍼지제어기 설계
이동우(Dong-Woo Lee),Li Hua,최정필(Jeong-Pil Choi),정석권(Seok-Kwon Jeong) 대한설비공학회 2006 대한설비공학회 학술발표대회논문집 Vol.2006 No.11
In this paper, we suggest fuzzy control to progress both energy saving and coefficient of performance(COP) in a refrigeration system. The capacity and superheat are controlled simultaneously and independently by inverters and electronic expansion valves respectively for saving energy and improving COP in the variable speed refrigeration system. By adopting the fuzzy control theory, the controller design for the capacity and superheat is possible without depending on dynamic model of the system. Some control experiments are conducted to design fuzzy controller by trial and errors manner. The experimental results show that the proposed fuzzy controller can establish good control performance for the complicated refrigeration system with inherent strong non-linearity.