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S-BRT 운행행태를 고려한 저상버스의 정차시간 예측모형
신소명,이수범,김영찬,박신형,유연승,최정훈,Shin, S.M.,Lee, S.B.,Kim, Y.C.,Park, S.H.,Yu, Y.S.,Choi, J.H. 한국안전학회 2021 한국안전학회지 Vol.36 No.1
This basic study introduces the concept of S-BRT and develops dwell time estimation models that consider road geometry and S-BRT characteristics for a signal operation strategy to meet the S-BRT's operational goal of high speed and punctuality. Field surveys of low-floor buses similar in shape to S-BRTs and data collection of passengers, station elements, vehicle elements, and other factors that can affect stop times were used in a regression analysis to establish statistically significant dwell time estimation models. These dwell time estimation models are developed by categorizing according to the locations of the signal or sidewalk that have the most impact on the dwell time. In this way, the number of people boarding and alighting the bus at the crowded door and the number of people boarding and alighting the bus at the front door considering the internal congestion was analyzed to affect the dwell time. The estimation dwell time models in this study can be used in the establishment of strategies that provide priority signals to S-BRTs.
소명옥(M. O. So),류길수(K. S. Rhyu),정재학(J. H. Chung),이윤형(Y. H. Lee),진선호(S. H. Jin),최한우(H. W. Choi) 한국해양대학교 해사산업연구소 2003 海事産業硏究所論文集 Vol.14 No.-
Generally, the main difficulty in the composition of tank-level control system may be in the point that plant parameters are severely varied according to the change of operating point. In order to cope with this difficulty, in this paper, an adaptive control is employed using model-following technique based on the optimal control law. Through the simulations and experiments the following results were observed. 1) The steady state error was not founded under the parameter variations caused by the change of operating point. 2) In spite of the change of operating point, the corresponding gains which were stored in the computer were found to be automatically updated so that the controller could have the adaptive ability. And also, the control specifications in view of transient response were found to be satisfied.
유효 구동력 개념을 이용한 고상 비정질화 반응의 예측에 관한 연구
곽준섭(J. S. Kwak),지응준(E. J. Chi),최정동(J. D. Choi),박상욱(S. W. Park),소명기(M. K. So),이성만(S. M. Lee),백홍구(H. K. Baik) 한국진공학회(ASCT) 1993 Applied Science and Convergence Technology Vol.2 No.1
이원계 박막확산쌍에서 열처리 방법에 의한 고상 비정질화 반응의 경향성을 예측하기 위하여 유효 구동력 개념을 제시하였다. 고상 비정질화 반응은 두 원소의 물리적 혼합물과 비정질상간의 최대 자유에너지차로 주어지는 열역학적 구동력(ΔG_(max))과 확산원소의 원자반경에 대한 기지의 유효 침입형자리 반경의 비로 주어지는 구조적 요소(R_(m/d))가 충족될 때 일어나는 빠른 확산에 의하여 발생된다고 고찰하고, 유효 구동력 기준을 이용하여 금속/금속계 뿐만아니라 금속/실리콘 계의 고상반응에 의한 비정질상 생성 경향성을 예측하고 실험결과들과 비교하여 잘 적용됨을 보였다. 또한, 유효 구동력 기준이 금속/실리콘 계에서 비정질상의 임계 성장두께 경향성의 예측에도 잘 적용됨을 보였다. It is proposed that formation and growth of amorphous interlayer through solid state amorphizing reaction can be predicted by the concept of effective driving force. The effective driving force consists of two factors; i) the thermodynamic driving force given by maximum free energy difference between physical mixture of binary elements and amorphous interlayer (ΔG_(max)) and ii) the structural factor given by a ratio between effective radius of interstitial site in host matrix and atomic radius of diffusing species (R_(m/d)). It is shown that the the criterion of effective driving force is successfully applied in the prediction of the formation of amorphous interlayer in metal/silicon systems as well as that of metal/metal systems from the comparison of experimental data. In addition, the concept of effective driving force can be well applied to predict the growth tendency of amorphous interlayer in metal/silicon systems.
진강규(G. G. Jin),이윤형(Y. H. Lee),이현식(H. S. Lee),진상훈(S. H. Jin),이승환(S. H. Lee),소명옥(S. M. So),황승욱(S. W. Hwang) 한국마린엔지니어링학회 2007 한국마린엔지니어링학회 학술대회 논문집 Vol.2007 No.-
Controlling engine coolant temperature is one of the tasks performed by today's cooling systems. In this paper, we present the PID control of vehicle cooling systems with a hydraulic coupling to overcome the inherent problem with direct-drive fans. The PID controller is tuned by a real-coded genetic algorithm(RCGA) and anti-windup is incorporated with the PID controller. Simulation is carried out to show the performance.