GMDSS模拟器系统中通信过程的研究与实现

全球海上遇险及安全系统GMDSS（globalmariti medistress and safety system）自1999年2月113完全实施以后，为了培训船员的需要。GMDSS模拟器的开发成为国内外的一个热点。文章介绍了自主开发的GMDSS模拟器中利用Visual C＋＋6．0实现通信过程的研究。其中主要涉及了Socket技术和多线程技术的应用。     

多目标多重运输调度问题的混合算法

本文研究了多目标多重运输调度问题．建立了该问题的目标规划模型，提出了该问题基于分校定界和割平面技术的混合算法。     

动车组运用计划和检修计划一体化编制模型及算法

针对动车运用所的动车组运用计划和检修计划编制问题,在动车组运用交路已知的前提下,以动车组的运用交路和检修规程为主要约束,以减少动车组使用数量、降低检修成本为优化目标,建立动车组运用计划和检修计划一体化编制的整数规划模型.根据动车组的可能运用情况和检修规程约束,求解动车组的可行运用路径集合;以该集合为基础,设计求解模型的模拟退火算法.通过算例分析,验证所提出的模型和算法可以有效解决动车组运用计划和检修计划的编制问题.     

解决网络延迟的I/O传输模型的研究

介绍通过管道使用线程交流信息和使用信号驱动I/O的混合方法,允许使用一个非阻塞的主线程和重叠的等待时间。     

An analysis of the social context of children’s weekend discretionary activity participation

This paper examines the discretionary time-use of children, including the social context of children’s participations. Specifically, the paper examines participation and time investment in in-home leisure as well as five different types of out-of-home discretionary activities: (1) shopping, (2) social, (3) meals, (4) passive recreation (i.e., physically inactive recreation, such as going to the movies or a concert), and (5) active recreation (i.e., physically active recreation, such as playing tennis or running). The social context of children’s activity participation is also examined by focusing on the accompanying individuals in children’s activity engagement. The accompanying arrangement is classified into one of six categories: (1) alone, (2) with mother and no one else, (3) with father and no one else, (4) with both mother and father, and no one else, (5) with other individuals, but no parents, and (6) with other individuals and one or both parents. The utility-theoretic Multiple Discrete-Continuous Extreme Value (MDCEV) is employed to model time-use in one or more activity purpose–company type combinations. The data used in the analysis is drawn from the 2002 Child Development Supplement (CDS) to the U.S. Panel Study Income Dynamics (PSID). The results from the model can be used to examine the time-use choices of children, as well as to assess the potential impacts of urban and societal policies on children’s activity participation and time-use decisions. Our findings also emphasize the need to collect, in future travel surveys, more extensive and higher quality data capturing the intra- and inter-household interactions between individuals (including children). To our knowledge, the research in this paper is the first transportation-related study to rigorously and comprehensively analyze the social dimension of children’s activity participation.