舰舰导弹战斗部发展研究

本文介绍了舰舰导弹战斗部的发展历程。围绕提高舰舰导弹战斗部的毁伤效率这一关键问题，参考有关文献资料，根据多年来的经验和理论成果，对舰舰导弹战斗部及其装药和引信的发展进行了分析与研究，并提出了主要发展途径。     

道路交通数据采集技术研究展望

交通数据是交通规划、管理与控制的基础,尤其对智能交通系统的建设和运营具有决定性作用。阐述交通数据采集技术的发展．分析、归类其技术特点,研究和展望新技术在交通数据采集中的应用前景,提出适合我国道路交通特点的交通数据采集技术。     

蓝牙公路车辆无线收费系统的设计

蓝牙公路车辆无线收费系统是一种先进的收费系统，采用了最新的蓝牙技术，能够极大提高道路通行能力。本文对移动环境下蓝牙链路建立的可行性做了一定的研究，设计实现了系统的硬件与相关软件。通过实验，在收费站与移动车辆问实现了无线双向通信与不停车收费。     

北京市浮动车交通状况信息实时计算系统

为应用于复杂城市路网的浮动车系统建设,提出了利用浮动车数据实时计算路网速度的系统建设流程,包括GPS数据接收、数据预处理、数据在电子路网底图上的匹配以及路段运行车速计算。并从数据过滤合理性、地图匹配效率、路网覆盖率及结果可信度等方面验证了该方法的可行性与实际效果。经验证,原始GPS数据经过预处理过滤后能显著提高点匹配率,而改进的路径匹配算法能使过滤后的数据达到95％左右的匹配率,基本覆盖大部分北京市快速路和主干路。     

��ʱ�䴰�Ķ೵�Ͷ���ó���·�������ģ�ͺ��㷨

创新性地考虑了多车型车辆路径问题中不同车型具有不同的边际费用和行驶费用的问题,并同时考虑车型与任务的相容性,对带时间窗约束的多车型多费用非满载车辆路径问题,以最小化总费用为目标建立了数学模型。由于该模型的NP-hard性质,基于高费用车型的边际费用和单位行驶费用比低费用车型的相应费用都要高以及低费用车型的边际费用远大于高费用车型的单位行驶费用的思想,对该模型设计了一个启发式算法。     

改进的重置成本法确定二手车价值

在中国,二手车鉴定评估还缺乏科学统一的评估理论和方法。文中以重置成本法为依据,并对重置成本法进行了改进,阐述了如何利用改进的重置成本法来确定二手车价值,并进行了实例验证,证明了改进的重置成本法的有效性。     

Tradable credit schemes on networks with mixed equilibrium behaviors

This paper analyzes and designs tradable credit schemes on networks with two types of players, namely, a finite number of Cournot–Nash (CN) players and an infinite number of (infinitesimal) Wardrop-equilibrium (WE) players. We first show that there are nonnegative anonymous credit schemes that yield system optimum, when transaction costs are not considered. We then analyze how transaction costs would affect the trading and route-choice behaviors of both CN and WE players, and discuss the equilibrium conditions on the coupled credit market and transportation network in the presence of transaction costs. A variational inequality is formulated to describe the equilibrium and is subsequently applied to a numerical example to assess the impacts of transaction costs on a tradable credit system. As expected, transaction costs reduce the trading volume of credits and change their market price. They also change the way how players respond to credit charges in their route choices and cause efficiency losses to the credit schemes that are previously designed without considering transaction costs. With transaction costs, travel costs of WE players will likely increase while those of CN players may decrease due to their higher adaptability in routing strategies.     

A demand model for recreational travel

A model is developed to describe and to predict the patterns of regional recreational travel. The model is designed in such a manner to allow its calibration and use without the need to conduct extensive travel surveys in a large region. To allow its use for prediction, the model is based on a causal structure and attempts to derive recreational travel demand from behavioural variables. The main hypothesis of the model is that the amount of recreational travel a recreation area attracts is affected by the accessibility of this area to points of demand potential and by its attractiveness relative to the recreation areas.

The calibration is founded on actual data on recreational travel to national forests in California, U.S.A. It is found in the calibration that accessibility to demand potential is the single most important determinant of recreational travel attraction. A simple relationship is derived to relate travel to each national forest to the relative accessibility of the forest. The model is calibrated and statistically validated.

It is suggested that when constructing travel demand models simplicity be sought, even at the risk of the loss of some explanatory power. In the calibration of such models statistical significant is more important than the ability to reproduce observed patterns.     

论港口建设费征管的风险防控管理

文中通过采用列举法和故障树法从客观因素和主观因素两方面对港建费征收过程中各项风险源进行分析，提出防控征收风险和廉政风险的措施。     

金查高速公路收费系统ETC建设方案探讨

介绍了长春至深圳高速公路金宝屯至查日苏段(以下简称金查高速)收费系统概况,分析了ETC建设面临的问题,并根据本项目特点、业主及运管单位的需求,确定了ETC建设方案。