信息分发模型研究

针对大量研究工作主要关注信息分发本身的设计和实现而对信息分发模型研究较少的问题,提出一种通用的信息分发描述模型,描述战场环境下的复杂信息分发模式,为信息分发系统的设计和研制提供指导和帮助.结合提出的描述模型,给出四种信息分发模式,供研究人员参考.     

Existence of self-financing and Pareto-improving congestion pricing: Impact of value of time distribution

This paper considers a static congestion pricing model in which travelers select a mode from either, driving on highway or taking public transit, to minimize a combination of travel time, operating cost and toll. The focus is to examine how travelers’ value of time (VOT), which is continuously distributed in a population, affects the existence of a pricing-refunding scheme that is both self-financing (i.e. requiring no external subsidy) and Pareto-improving (i.e. reducing system travel time while making nobody worse off). A condition that insures the existence of a self-financing and Pareto-improving (SFPI) toll scheme is derived. Our derivation reveals that the toll authority can select a proper SFPI scheme to distribute the benefits from congestion pricing through a credit-based pricing scheme. Under mild assumptions, we prove that an SFPI toll always exists for concave VOT functions, of which the linear function corresponding to the uniform distribution is a special case. Existence conditions are also established for a class of rational functions. These results can be used to analyze more realistic VOT distributions such as log-normal distribution. A useful implication of our analysis is that the existence of an SFPI scheme is not guaranteed for general functional forms. Thus, external subsidies may be required to ensure Pareto-improving, even if policy-makers are willing to return all toll revenues to road users.     

Modeling heterogeneous risk-taking behavior in route choice: A stochastic dominance approach

This paper proposes a unified approach to modeling heterogonous risk-taking behavior in route choice based on the theory of stochastic dominance (SD). Specifically, the first-, second-, and third-order stochastic dominance (FSD, SSD, TSD) are respectively linked to insatiability, risk-aversion and ruin-aversion within the framework of utility maximization. The paths that may be selected by travelers of different risk-taking preferences can be obtained from the corresponding SD-admissible paths, which can be generated using general dynamic programming. This paper also analyzes the relationship between the SD-based approach and other route choice models that consider risk-taking behavior. These route choice models employ a variety of reliability indexes, which often make the problem of finding optimal paths intractable. We show that the optimal paths with respect to these reliability indexes often belong to one of the three SD-admissible path sets. This finding offers not only an interpretation of risk-taking behavior consistent with the SD theory for these route choice models, but also a unified and computationally viable solution approach through SD-admissible path sets, which are usually small and can be generated without having to enumerate all paths. A generic label-correcting algorithm is proposed to generate FSD-, SSD-, and TSD-admissible paths, and numerical experiments are conducted to test the algorithm and to verify the analytical results.     

基于雷达图法的军用爆炸品航空运输归类研究

在初步确定军用爆炸品航空运输适运范围的基础上,从军用爆炸品理化性质出发,依据冲击感度、摩擦感度、静电火花感度、热敏感度等重要感度,运用雷达图法对军用爆炸品的危险性进行了综合分析评价,并依据危险性大小,对其科学归类,可为进一步研究其包装、储运、配载隔离、组织实施等问题奠定基础。     

劳斯莱斯轴带电机的应用及其优越性

本文首先对船舶轴带发电机的定义和类型进行了简述。在此基础上,主要介绍了劳斯莱斯轴带电机(Hybrid Shaft Generator,HSG)的概念、结构特点、工作模式和优越性。最后对该类型轴带电机的适用范围、经济效益等方面的问题进行了探讨和研究。     

基于MATLAB的数字基带传输系统的仿真

以数字基带传输系统为例，在数字基带通信系统数学模型分析基础上，设计了总体仿真框图．利用MATLAB对各个子系统进行了建模和封装，建立了数字基带通信系统仿真模型，并对仿真模型进行了测试。结果表明，仿真结果与理论值基本一致。     

基于专家系统的轮机模拟器自动评分系统研究

客观公正的考核评分系统可有效的提高轮机模拟器人员培训的效率,降低培训的成本。以知识库的建立为重点,论文阐述了专家系统在轮机模拟器自动评分系统中的应用,并以推进电机的操作评分为例说明整个知识库建立过程和遵循的准则。在考核评估的实际应用中,自动评分系统取得了较好的效果。     

高校学生党支部设置模式研究和探讨

高校学生党支部设置,是高校学生党支部工作的重要组成部分,是保障学生党建工作的前提,是做好基层党组织工作的重点,是新时期学生党建工作的一项重要课题。本文对高校学生党支部设置模式主要利弊进行了分析,提出了新时期高校学生党支部优化设置的保障措施。     

实现中国铁路制造业跨越式发展

综述了中国铁路制造业作为中国铁路发展基石的现状及面临的形势。面对２１世纪信息技术革命和经济全球化的挑战，大力发展先进的铁路制造业，是建设有中国特点并拥有自主知识产权的铁路技术装备体系，实现中国轨道交通现代化的战略选择。     

矿化垃圾反应床处理印染废水系统驯化效果

为开发廉价的吸附剂和生物载体,将矿化垃圾资源化利用,在实验室建立矿化垃圾反应床处理模拟染料废水,考察容积负荷及水力负荷渐增法对反应床内微生物的驯化效果。训化结束时,容积负荷渐增法出水中COD,NH3-N,TP,MB浓度分别为49.81,3.06,0.45,1.09 mg·L-1,驯化时间越长出水效果越稳定,去除率维持在98%以上。水力负荷渐增法驯化结束时出水COD,NH3-N,TP,MB分别为81.00,4.39,0.15,1.38 mg·L-1。结果表明两种驯化方法均可取得较好的驯化效果,容积负荷渐增法去除效果优于水力负荷渐增法。在矿化垃圾反应床处理染料废水应用中,将选用容积负荷渐增法对矿化垃圾进行驯化,同时需保证一定的训化时间。