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Commuter rail systems are being introduced into many urban areas as an alternative mode to automobiles for commuting trips. It is anticipated that the shift from the auto mode to rail mode can greatly help alleviate traffic congestion in urban road networks. However, the right-of-way of many existing commuter rail systems is usually not ideally located. Since the locations of rail systems were typically chosen long ago to serve the needs of freight customers, the majority of current commuter rail passengers have to take a non-walkable connecting trip to reach their final destinations after departing the most conveniently located rail stations. To make rail a more viable commuting option and thus more competitive to the auto mode, a bus feeder or circulator system is proposed for transporting passengers from their departing rail stations to final work destinations in a seamless transfer manner. The key research question with operating such a bus circulator system is how to optimally determine a bus route and stopping sequence for each circulating tour by using the real-time demand information. In this paper, we name this joint routing and stopping optimization problem the circulator service network design problem, the objective of which is to minimize the total tour cost incurred to bus passengers and operators with respect to minimizing the walk time of each individual bus passenger. A bi-level nonlinear mixed integer programming model is constructed and a tabu search method with different local search strategies and neighborhood evaluation methods is then developed for tackling the circulator service network design problem. 相似文献
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空气板线馈电网络由于具有损耗小、耐功率高、幅相控制容易等特点而广泛应用于平面阵列天线中.天线辐射单元与空气板线馈电网络结构一体化,结构紧凑、集成度高,便于制造和装配,可大大降低成本和周期.文中介绍了两种天线单元形式及仿真结果,给出了一种天线单元及由其组成线阵的试验结果,表明其具有良好的性能,满足实际使用要求.其设计思想具有良好的扩展性. 相似文献
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建立了在中心频率处带状线1/4波长定向耦合器S参数和驻波比的一阶近似式,根据灵敏度定义推导出耦合端和直通端幅度相对电路参数的灵敏度表达式,通过编程并与Ansoft公司仿真软件比较,结果显示了所推导公式的正确性和有效性. 相似文献
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