Assignment theory of intelligent traffic systems (ITS) is a new information management system of vehicle in recent developments. In this paper, the basic concepts of the theory and three representative studies, that...Assignment theory of intelligent traffic systems (ITS) is a new information management system of vehicle in recent developments. In this paper, the basic concepts of the theory and three representative studies, that is, (1) simulation based approach, (2)optimal control theory approach, and (3) optimization approach are introduced. Their advantages and drawbacks are analyzed and expounded. Also introduced are two latest techniques of assignment theory of ITS. Finally, a dynamic assignment model of a traffic transport network is proposed.展开更多
This paper proposes a dynamic channel allocation scheme based on cognitive radio （CR）. Firstly, the channel probing based on MMSE criterion is implemented, with which the probability distribution of channels in use ...This paper proposes a dynamic channel allocation scheme based on cognitive radio （CR）. Firstly, the channel probing based on MMSE criterion is implemented, with which the probability distribution of channels in use by the primary user is given. Next, take the distances between the CR users and the primary user as basis to stratify the CR users, among the layers; the simulated annealing （SA） algorithm is used to implement the channel assigmnent. This algorithm differs from the well-known 0-1 matrix based allocation scheme, and keeps a good tradeoff between complexity, capacity as well as the fairness problems. The simulation results show that this algorithm can improve the allocation efficiency effectively.展开更多
文摘Assignment theory of intelligent traffic systems (ITS) is a new information management system of vehicle in recent developments. In this paper, the basic concepts of the theory and three representative studies, that is, (1) simulation based approach, (2)optimal control theory approach, and (3) optimization approach are introduced. Their advantages and drawbacks are analyzed and expounded. Also introduced are two latest techniques of assignment theory of ITS. Finally, a dynamic assignment model of a traffic transport network is proposed.
文摘This paper proposes a dynamic channel allocation scheme based on cognitive radio （CR）. Firstly, the channel probing based on MMSE criterion is implemented, with which the probability distribution of channels in use by the primary user is given. Next, take the distances between the CR users and the primary user as basis to stratify the CR users, among the layers; the simulated annealing （SA） algorithm is used to implement the channel assigmnent. This algorithm differs from the well-known 0-1 matrix based allocation scheme, and keeps a good tradeoff between complexity, capacity as well as the fairness problems. The simulation results show that this algorithm can improve the allocation efficiency effectively.
