基于GPS／GPRS／GIS的实时车辆监控指挥系统设计及实现

本给出了一种基于GPS／GPRS／GIS的实时车辆监控指挥系统的实现方案。中分析了GPRS、GIS、GPS技术的特点及结合的方法，着重阐述了实验系统结构和车载设备的软硬件设计。该系统综合集成了车辆定位、中心监控、指挥调度、语音数据双向通信等功能，满足城市交通一体化系统实时数据采集、传输、处理与轴助决策等的需要。     

地铁车辆电气数据采集诊断及无线传输方法研究

文章介绍了地铁车辆数据采集诊断及无线传输方法,并结合地铁车辆的调试工艺文件设计了地铁车辆电气数据采集方法、自动判定方法及无线传输方式。采用该系统可自动判定每个调试步骤的操作和结果,减少人为误判行为,大大提高地铁车辆的调试效率,文章最后在地铁车辆静态调试中进行了相关模拟测试,验证了该系统的可行性。     

非完全信息条件下交通分布预测时间（距离）法

对于新兴城镇和快速扩张城市的交通分布预测，由于信息缺乏很难采用传统的预测方法．本文提出了非完全信息下的交通分布预测时间(距离)法，并给出了其参数标定方法，对其可靠性也进行了实证性分析，最后，探讨了该模型对时间(或距离)的敏感性问题。     

混沌时间序列局域零阶预测法性能比较

利用计算机仿真比较了均值、距离加权和指数加权3种混沌局域零阶预测方法的预测精度、抗噪声及多步预测性能．在无噪声或噪声干扰较小时，距离加权预测法的性能最好；当噪声干扰较大时，指数加权预测法预测性能最优．指数加权与均值预测法几乎具有相同的多步预测能力，距离加权预测法的短期预测性能最佳．对于标准的离散混沌时间序列，3种预测方法多步预测误差达到一定值后，不再随预测步长的增加而增加；对于由连续系统抽样得到的混沌时间序列，多步预测误差呈现一定周期性变化．     

高速公路标志设置的几点问题及建议

针对目前高速公路上标志设置普遍存在的问题进行分析，给出常见情况下视认距离和设置密度的计算公式，并对存在的问题提出改进建议，可为高速公路标志的设置和改造提供参考。     

VBOXⅡ车辆路试系统功能简介

VBOX Ⅱ车辆路试系统是基于新一代高性能卫星接收器,用于测量移动物体(汽车、摩托车)速度和位置,并能提供加速度、减速度,制动距离,时间,油耗等准确测量值的一款功能强大的仪器,由于体积较小、安装简便,非常适合车辆路试实验时使用.VBOX本身带有标准的模拟、数字、CAN总线接口,整个系统功能可根据用户需要进行扩充.     

全智星Xtalk：最适合车友的通信方式

经常参加自驾游、户外活动的车友朋友们都知道,拥有一台对讲机是您最理想的通信方式。可是,一般的民用对讲机通信距离太短,而专业车台造价又太高,并且受到国家频率管制。那么。有没有一种解决方案能够满足广大车友的需求呢？全智星Xtalk在把风靡美国的手机对讲技术引入中国,提供了—个很好的选择。     

A high-performance low cost inverse integer transform architecture for AVS video standard

A high-performance, low cost inverse integer transform architecture for advanced video standard (AVS) video coding standard was presented. An 8×8 inverse integer transform is required in AVS video system which is compute-intensive. A hardware transform is inevitable to compute the transform for the real-time ap-plication. Compared with the 4×4 transform for H.264/AVC, the 8×8 integer transform is much more complex and the coefficient in the inverse transform matrix Ts is not inerratic as that in H.264/AVC. Dividing the Ts into matrix S8 and R8, the proposed architecture is implemented with the adders and the specific CSA-trees instead of multipliers, which are area and time consuming. The architecture obtains the data processing rate up to 8 pixels per-cycle at a low cost of area. Synthesized to TSMC 0.18 μm COMS process, the architecture attains the operating frequency of 300 MHz at cost of 34 252 gates with a 2-stage pipeline scheme. A reusable scheme is also introduced for the area optimization, which results in the operating frequency of 143 MHz at cost of only 19 758 gates.     

A secure trust model for P2P systems based on trusted computing

Trust is one of the most important security requirements in the design and implementation of peer-to-peer （P2P） systems. In an environment where peers＇ identity privacy is important, it may conflict with trustworthiness that is based on the knowledge related to the peer＇s identity, while identity privacy is usually achieved by hiding such knowledge. A trust model based on trusted computing （TC） technology was proposed to enhance the identity privacy of peers during the trustworthiness evaluation process between peers from different groups. The simulation results show that, the model can be implemented in an efficient way, and when the degree of anonymity within group （DAWG） is up to 0.6 and the percentage of malicious peers is up to 70%7 the service selection failure rate is less than 0.15.     

Intelligent drug delivery system using UML diagrams analysis

A novel intelligent drug delivery system potential for the more effective therapy of the diabeticswas proposed, and the composition of system was analyzed. Based on the design of micro-electro-mechanicalsystems (MEMS), an iterative modeling process was introduced. Unified modeling language (UML) was em-ployed to describe the function requirement, and different diagrams were built up to explore the static model,the dynamic model and the employment model. The mapping analysis of different diagrams can simply verifythe consistency and completeness of the system model.