城市交叉口群信号协调控制范围动态划分方法

考虑交叉口群交通关联特征，本文提出了交叉口群信号协调控制范围动态划分 方法.为响应实时交通需求，采用交叉口通行能力利用率指标识别道路网络中的瓶颈区 域.根据协调系数与不均衡系数两类路段关联度指标，搜索瓶颈区域的影响范围.应用自 组织映射神经网络，作为路段关联度“强”与“弱”的临界划分工具.使用二分法逐步缩小搜 索范围，断开关联度较弱的路段连接，在余下的连通网络中继续分类直到满足交叉口群 协调控制规模约束的大小为止.仿真结果表明，交叉口群范围的合理划分有助于提高路网 信号协调控制的效率.

Complex Dynamics of Airlines’Price Competition and Effectiveness of Price Regulation Policies

To investigate the complex dynamics of airlines’price competition and to verify the effectiveness of the government price regulation policies, this study develops a dynamic price competition model of airlines with duopoly. The model is based on the theory of bifurcation of dynamical systems. The existence and stability of equilibrium points of this model are also discussed. The complex dynamics of this model in different market parameters are examined by numerical simulation. The results show that the speed of price adjustment has an obvious impact on the stability of model. Compared with the equilibrium average profits, all airlines’average profits decrease obviously when chaos is occurred. It’s necessary and effective for CAAC to implement the price regulation policies. Two kinds of regulation policies are both effective to make chaotic price competition well- ordered. The key of regulation policies is to give an appropriate range of floating price.