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차량 동역학을 이용한 멀티에이전트 기반 교통시뮬레이션 개발
조기용(Kiyong Cho),권성진(Seongjin Kwon),배철호(Chulho Bae),서명원(Myungwon Suh) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The validity of simulation has been well-established for decades in areas such as computer and communication system. Recently, the technique has become entrenched in specific areas such as transportation and traffic forecasting. Several methods have been proposed for investigating complex traffic flows. However, the dynamics of vehicles and their driver's characteristics. even though it is known that they are important factors for any traffic flow analysis, have never been considered sufficiently, In this paper, the traffic simulation using a multi-agent approach with considering vehicle dynamics is proposed. The multi-agent system is constructed with the traffic environment and the agents of vehicle and driver. The traffic environment consists of multi-lane roads, nodes, virtual lanes. and signals. To ensure the fast calculation, the agents are performed on the based of the rules to regulate their behaviors. The communication frameworks are proposed for the agents to share the information of vehicles' velocity and position. The model of a driver agent which controls a vehicle agent is described in the companion paper. The vehicle model contains the nonlinear subcomponents of engine, torque converter, automatic transmission, and wheels. The simulation has proceeded for an interrupted and uninterrupted flow model. The result has shown that the driver agent performs human-like behavior ranging from slow and careful to fast and aggressive driving behavior, and that the change of the traffic state is closely related with the distance and the signal delay between intersections. The system developed shows the effectiveness and the practical usefulness of the traffic simulation.
멀티 에이전트를 이용한 도시고속도로 교통축에 대한 통합제어.Ⅱ: 최적화
조기용(Kiyong Cho),김문성(Munsung Kim),권성진(Sungjin Kwon),서명원(Myungwon Suh) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_1
Freeway Corridors consist of urban freeways and parallel arterials that drivers can use alternatively. Ramp metering in freeways and signal control in arterials are contemporary traffic control methods that have been developed and applied in order to improve traffic conditions of freeway corridors. However, most of the existing studies have focused on either optimal ramp metering in freeways, or progression signal strategies between arterial intersections. There have been no traffic control systems in Korea that integrates the freeway ramp metering and arterial signal control. The effective control strategies for freeway operations may cause negative effects on arterial traffic. On the other hand, traffic congestion and bottleneck phenomenon of arterials due to the increasing peak-hour travel demand and ineffective signal operation may generate an accessibility problem to freeway ramps. Thus, the main function of the freeway which is the through-traffic process has not been successful. The purpose of this study is to develop an integrated control model that connects freeway ramp metering systems and signal control systems in arterial intersections. And Optimization of integrated control model which consists of ramp metering and signal control is another purpose. Optimization results are verified by comparison with the results from MATDYMO.
멀티 에이전트를 이용한 도시고속도로 유고 상황 예측.Ⅱ: 시뮬레이션 응용 중심으로
조기용(Kiyong Cho),권성진(Sungjin Kwon),김현준(Hyunjun Kim),서명원(Myungwon Suh) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_1
System architecture of multi-agent for traffic simulation with vehicle dynamics model is described in the companion paper. In this paper, the freeway traffic states under blocked road conditions are estimated. The simulation is validated with URFSIM, which is based on the high order continuum equation and Wang' model, which is based on the extended kalman filter (EKF) approach. The simulation of the freeway model was implemented as two cases. The first case analyzed traffic flow for the simple freeway model excepting on and off ramp as road capacity changed. Its results are verified by comparison with the results from URFSIM. Second case analyzed the traffic flow for the freeway model including on and off ramp as road capacity changed. Its results are verified by comparison with the results from Wang's model. The system presented in this paper shows very similar result to URFSIM and has better description for the relief of traffic congestion. In the comparison of EKF approach, it is found that this system is able to estimate the traffic situation with only incoming traffic volume. This system shows great promise and has significant implications on future traffic state forecasting research.
차량 동역학을 이용한 멀티에이전트 개발 교통시뮬레이션 개발
조기용(Kiyong Cho),배철호(Chulho Bae),권성진(Seongjin Kwon),서명원(Myungwon Suh) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In companion paper, the composition and structure of the traffic environment is derived. Rules to regulate agent behaviors and the frameworks to communicate between the agents are proposed. In this paper, the model of a driver agent which controls a vehicle agent is constructed. The driver agent is capable of having different driving styles. That is, each driver agent has individual behavior settings of the yielding index and the passing index. The yielding index can be defined as how often the agent yields in case of lane changes, and the passing index can be defined as how often the agent passes ahead. According to these indices, the agents overtake or make their lanes for other vehicles. Similarly, the vehicle agents can have various vehicle dynamic models. According to their dynamic characteristics, the vehicle agent shows its own behavior. The vehicle model of the vehicle agent contains the nonlinear subcomponents of engine, torque converter, automatic transmission, and wheels. The simulation has proceeded for an interrupted flow model. The result has shown that it is possible to express the characteristics of each vehicle and its driver in a traffic flow, and that the change of the traffic state is closely related with the distance and the signal delay between intersections. The system developed in this paper shows the effectiveness and the practical usefulness of the traffic simulation.
멀티 에이전트를 이용한 도시고속도로 교통축에 대한 통합제어.Ⅰ: 문제 정의
조기용(Kiyong Cho),김문성(Munsung Kim),배철호(Chulho Bae),서명원(Myungwon Suh) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_1
Freeway Corridors consist of urban freeways and parallel arterials that drivers can use alternatively. Ramp metering in freeways and signal control in arterials are contemporary traffic control methods that have been developed and applied in order to improve traffic conditions of freeway corridors. However, most of the existing studies have focused on either optimal ramp metering in freeways, or progression signal strategies between arterial intersections. There have been no traffic control systems in Korea that integrates the freeway ramp metering and arterial signal control. The effective control strategies for freeway operations may cause negative effects on arterial traffic. On the other hand, traffic congestion and bottleneck phenomenon of arterials due to the increasing peak-hour travel demand and ineffective signal operation may generate an accessibility problem to freeway ramps. Thus, the main function of the freeway which is the through-traffic process has not been successful. The purpose of this study is to develop an integrated control model that connects freeway ramp metering systems and signal control systems in arterial intersections. And Optimization of integrated control model which consists of ramp metering and signal control is another purpose. The design of experiment, neural network, and simulated annealing are used for optimization.