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졸음운전 방지를 위한 fuzzy 추론에 의한 각성도의 평가
김연호,고한우,유준,Kim, Y. H.,Ko, H. W.,Lyou, J. 대한의용생체공학회 1997 의공학회지 Vol.18 No.4
본 연구에서는 졸음운전 방지를 위한 방법으로 기존의 3단계 경고음법과 fuzzy logic을 이용한 가성도 측정 및 제어법을 시뮬레이션으로 비교 및 분석하였다. 각성상태를 제어하는 방법으로 사용되었던 기존의 각성제어지표는 실 차에는 사용될 경우 효과적이지 못하므로 각성상태에 따른 영역별 Nz와 IRI의 상관분포도를 분석하여 기존의 각성제어지표를 수정하였다. Fuzzy 추론으로는 Sugeno의 방법을 사용하였고 멤버쉽함수와 제어규칙 베이스는 수정된 각성제어지표로부터 결정하였다. 시뮬레이션 결과 60이하의 IRI가 발생되는 경우, Nz의 변화에 따라 두 제어방법 모두 small, medium, big의 경고음이 발생되었으나 3단계 경고음법은 다음 단계의 발생영역이 될 때까지 같은 출력만을 발생한다. 그러나 퍼지추론의 출력은 피검자의 각성수준의 변화에 잘 추종하여 변화되었으므로 3단계 경고음법의 문제점을 해겨할 수 있었고 더욱이 퍼지 추론의 출력과 Nz와의 상관계수(r=0.99)가 매우 높았으므로, 실제 운전시 퍼지추론 방법을 이용한 각성도 평가 및 제어에 적용할 경우 3단계 경고음법 보다 효과적일 것으로 기대된다. This paper describes the arousal measurement and control system using fuzzy logic to prevent drowsy driving. Sugeno's method was used for fuzzy inference in this study. Arousal evaluation and control criteria were modified from result of Nz-IRI analysis depending on arousal sate. Membership function and rule base of fuzzy inference were determined from the modified arousal level criteria When lRl (Inter-SIR Interval) was shorter than 60sec, outputs of both methods were changed from small to big, but output of three step warning method was same level until the next warning range. Since output of fuzzy inference tracked well the change of subject's arousal level, problems of three step warning method could be overcome by fuzzy inference method Furthermore, the output of the fuzzy inference was highly correlated with Nz(r = 0.99). Therefore, the fuzzy inference method for evaluation and the control of arousal will be more effective at real driving situation than three step warning method.
김연호(Y. H. Kim),김현수(H. S. Kim) 한국자동차공학회 1993 한국 자동차공학회논문집 Vol.1 No.1
Dynamic characteristics of an electro-magnetic clutch transmission system were investigated by using Bondgraph modeling method. Simulation results showed that when the rotor engaged with the armature, the response time of the current, the driver torque, the rotational speed and the relative sliding time between the driver and the driven side decreased, as the gap size between the rotor and the armature decreased and the number of coil turns increased. Also, when the rotor disengaged with the armature, the delay time increased with the decreased gap size and the increased number of coil turns. It was found that the experimental results of the current, the driver torque, the rotational speeds were in good accordance with the theoretical results. The results of this study can be used as basic design materials of the electro-magnetic clutch.<br/>
고한우(H.W.Ko),김연호(Y.H.Kim) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_2
This paper describes the difference between two types of control criteria. Arousal evaluation and control by the criteria (I) had problems using criteria (I) when IRI(Inter-SIR-Interval) was shorter than 6Osec. So criteria(I) was modified from results of Nz-IRI analysis depending on arousal state. When criteriaOI) was applied arousal evaluation and control, Nz and RT(Reaction Time) were smaller than result(Nz, RT) of the criteria(I). Therefore, criteria(I) for the arousal evaluation and control will be more effective at real driving situation than criteria(I).
범용 유동해석 데이터 형식을 이용한 유동소음 수치해석 프로그램 개발
최익황(I. H. Choi),김연호(Y. H. Kim),김준희(J. H. Kim),임태균(T. G. Lim),전완호(W. H. Jeon) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
Recently, the noise problem has been recognized as a serious problem in addition to pollution such as fine dust due to industrialization. In this paper numerical analysis methods using computational fluid dynamics (CFD) and computational aeroacoustics (CAA) was performed using the CFD general notation system (CGNS) and developed the S/W for visualizing the analyzed result of flow noise. The aerodynamic noise analysis S / W has been developed to deal larger models and larger grids.