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퍼지로직을 기초로한 차량 조종안정성 평가를 위한 예측 운전자 모델
김호용(H. Y. Kim) 한국자동차공학회 1997 한국 자동차공학회논문집 Vol.5 No.3
A fuzzy driver model based on a preview-predictor and yaw rate is developed. The model is used to investigate the handling performance of two wheel steering system(2WS) and four wheel steering system(4WS) vehicles. The two degree-of-freedom model which has yaw and lateral motion predicts the path of the vehicles. Based upon the yaw rate and lateral deviations, the fuzzy engine describes the human driver's complicated control behavior which is adjusted for the driving environment. Both typical single lane change maneuver and double lane change maneuver are adopted to demonstrate the feasibility of fuzzy driver model.
서영건(Seo Y . G .),오해석(Oh Hae Seok),심종채(Shim J . C .),김호용(Kim H . Y .),김현주(Kim H . J .) 한국정보처리학회 1997 정보처리학회논문지 Vol.4 No.11
This thesis proposes a media synchronization mechanism for video conferencing system by analyzing a variation of the delay time of media. Using this mechanism, this thesis analyzes the media traffics and determines the values of external variables important on waiting time. This system uses some dummy streams to get the time. When two hosts are initially connected, they change the dummy streams by which a logical time of the sender may be extracted. The time presenting a media stream is a sum of base time, logical time and the waiting time. At this time, for the purpose of optimally adjusting the waiting time, this mechanism uses the rate of updating the waiting time and the sampling unit of media. These values are acquired by analyzing the waiting times, the delay rates and the delayed arrival times.
진동 벽면을 가진 단순 확장형 소음기 모델의 투과손실 특성 해석을 위한 DIRECT BEM-FEM 연성 모델의 적용
최창환(C. H. Choi),김호용(H. Y. Kim) 한국자동차공학회 1998 한국 자동차공학회논문집 Vol.6 No.6
A directly coupled Boundary Element and Finite Element Model was applied to the dyanalysis of a coupled acoustic silencer with vibratory wall. In this coupled BEM - FEM muffler model, the BEM model was used to discretize the acoustic cavity and the FEM model was used to discretize the vibratory wall structure. Then the BEM model was coupled with the FEM model. The results of the coupled BEM-FEM model for the dynamic analysis of the simple expansion type reactive muffler configurations with flexible walls were verified by comparing the predicted results to analytical solutions. In order to investigate the effects of the muffler's structural flexibility on its transmission 10ss(TU characteristics. the results of the coupled BEM - FEM model in conjunction with the four-pole parameter theory were utilized. The muffler's TL characteristics using the BEM-FEM coupled model with flexible walls as compared to other muffler configurations was studied. Finally the muffler's TL values with respect to different wall's thickness are predicted and compared.<br/>