基于计算机网络路由行为方案的春运旅客区域划分探讨

根据网络路由协议的特性,利用网络路由选择最优路径的原理,把全国春运铁路网络仿真成计算机网络并划分成不同的区域运行网络路由协议,寻找一种基于网络路由行为的铁路运输方式来提高运输旅客的效率,达到缓解春运压力的目的。     

改进混合遗传算法在车辆路线问题中的应用研究

物流配送车辆路线问题，是物流配送优化中不可缺少的环节。针对传统的遗传算法存在收敛速度慢，局部搜索能力差，易早熟的缺点，采用混合遗传算法进行优化求解。即采用二重结构编码，可以使问题变得更简洁，提高遗传法的搜索效率。用个体数量控制选择策略，以保证群体的多样性，用改进的顺序交叉算子避免优良基因片断在顺序交叉时被破坏，保证算法能够收敛到全局最优。结合具体实例，通过实验计算证明了该改进算法的良好性能。     

手机提供拥挤信息的公交路径选择研究

在公交网络中，智能手机提供的出行信息可为公交出行乘客提供有效帮助. 在手机提供车内拥挤信息条件下，对乘客的路径选择过程进行模拟，构建乘客出行和换乘两种路径选择模型，包括车内的座位分配过程和在站台的排队过程. 通过仿真计算，比较了提供拥挤信息与不提供拥挤信息条件下车内拥挤程度改善情况，揭示了提供拥挤信息条件下乘客的路径选择规律. 结果表明，手机提供车内拥挤信息可以大幅度降低车内的拥挤程度，有效改善乘客的乘车环境.     

考虑疫情影响的卡车无人机协同配送路径优化

在新型冠状病毒感染的肺炎（新冠肺炎）疫情蔓延的背景下，提出利用“卡车-无人机”协同配送新模式对疫情相对严重的地区进行物流配送，进一步研究该模式对疫情影响下物流配送的价值。考虑无人机最大飞行时间、载重以及道路条件等因素，将客户分为只能由卡车服务的客户、只能由无人机服务的客户以及卡车与无人机均能提供服务的客户3类，以车辆总服务时间最小为目标，建立车辆与无人机协同为客户提供配送服务的数学模型。设计嵌入简单启发式算法的混合邻域搜索算法，通过不同规模算例运算时间及多次运算解的波动性验证算法的有效性；通过对TSP算法、邻域搜索算子的不同组合的分析，找出最优的组合，进而对无人机最大飞行时间、无人机飞行速度载重影响因子进行了灵敏度分析。研究结果表明：计算结果验证了算法的有效性；TSP算法质量直接影响邻域搜索操作得到解的质量，可以通过高效TSP算法设计寻找更好的配送方案；无人机续航能力越强，目标函数就越小，无人机飞行速度载重影响因子越大，导致配送所需的服务时间越多，可以通过选用续航能力强、飞行速度受载重影响小的无人机提升配送服务效率。研究成果可以为城市发生重大灾难或特殊情况时，城市物流配送系统中无人机的应用提供指导和参考价值。     

Exploration of route choice behavior with advanced traveler information using neural network concepts

A model of driver's route choice behavior under advanced traveler information system (ATIS) is developed based on data collected from learning experiments using interactive computer simulation. The experiment subjected drivers to 32 simulated days in which they were to choose between the freeway or a side road. A neural network model is used as a convenient modeling technique in this initial phase of the analysis. The results indicated that most subjects made route choices based mainly on their recent experiences. It was also demonstrated that route choice behaviors are related to the personal characteristics as well as the characteristics of the respective routes. Travel experiences have less effect on the choice of the side road compared to the freeway and the results indicate that the prediction accuracy of the model, the acceptance rate of advice, and the quality of advice are closely correlated. The model developed here was for advice consistently provided at a level of 75 percent accuracy. The paper concludes with a discussion of experimental limitations and suggestions for future research.     

Valuing reductions in environmental pollution in a residential location context

A stated preference ranking experiment is designed to estimate the willingness-to-pay (WTP) for reducing the amount of atmospheric pollution in a group-based residential location context. Important issues are the proper definition of the context and the variable metric for the environmental attribute. Sample members were asked to rank 10 options arising from variations in the attributes travel time to work and to study, rent of the house and an environmental attribute (the number of days of Alert, in terms of concentration of PM₁₀, at a dwelling’s location). Multinomial logit models based on a consistent microeconomic framework were estimated for various stratifications of the data (income, pollution sensitivity, and type of dwelling currently inhabited). From these subjective values of time and WTP were derived for reductions in the number of days of alert and hence the amount of pollutant concentration at a given location. The WTP came out at about 1% of the family income for reducing one contingence day per year; this is approximately 60% higher than an estimate reported for the city of Edmonton, Canada, but the average PM₁₀ concentration in Santiago is about six times higher.     

高速网络第三层交换技术的发展

介绍了高速网络第三层交换技术产生的历史背景、解决方案和实现策略 ,阐述了局域网和广域网中几种典型产品的第三层交换技术 ,包括 3Com的FastIP技术、CISCO的NetFlow交换以及Bay的新型结构高性能IP路由交换器等     

基于动态规划的舰船最佳航路设计

针对目前对舰船最佳航路选择的重要性，通过分析明确了舰船最佳航路的概念，并用发展和应用比较成熟的动态规划方法对舰船最佳航路的设计进行建模，以期得到实际应用。     

港口物流业发展趋势--战略联盟

分析航运市场的变化给港口物流业带来的影响,并由此说明港口物流业联盟的必要性。同时阐述港口物流联盟可采取的战略选择有纵向联盟和横向联盟。     

短波自组网路由协议驱动方式研究

自组网路由协议可依驱动方式分为表驱动和按需驱动,这两种驱动方式的路由协议各有其优缺点.对这两类路由协议的路由发现延迟、路由开销、网络吞吐量等性能进行了对比分析,并结合短波自组网在网络中心战体系中所处的层次和主要应用对性能的需求,分析了适应于短波自组网的路由驱动方式.