浅述网络技术与信息安全

在信息社会高度发展的今天，计算机网络系统得到长足的发展，而网络安全性问题也凸现出来。如何防范计算机系统受外界因素干扰，保持良好的工作状态，是网络管理人员亟待解决的问题。文章以影响计算机网络安全的主要因素为突破口，提出了各种利于计算机网络正常运行的措施。     

中山大学风雨球场索-拱杂交结构设计

采用索-拱杂交结构体系设计了中山大学风雨球场．阐述了该结构体系的结构特点，研究了结构的静、动力性能，介绍了结构中拉索预应力的确定原则以及结构节点的构造处理．     

MPEG—4视频无线传输的自适应QoS控制

自适应QoS控制机制由优化模式选择和固定时延的混合自动请求重传组成，优化模式选择在压缩层提供QoS支持，固定时延的混合自动请求重传在链路层提供QoS支持。仿真结果显示给出的自适应QoS控制对MPEG—4视频在动态的无线信道上传输达到了满意的质量，并有效地利用了网络资源。     

分子标记鉴定红莲型细胞质雄性不育杂交水稻组合及其亲本

利用RAPD分子标记对红莲型细胞质雄性不育(HL—CMS)杂交水稻组合及其亲本进行了DNA多态性分析。从124个随机引物中筛选出具有非常明显的多态性，且只能扩增出1～5个片段的4个引物能有效地区分和鉴定红莲型(HL)2个杂交水稻组合(粤泰系列，从广系列)的杂种及其亲本。     

混合电动汽车子系统开发方法的研究

由于混合电动汽车可具有节能、环保、可多次充电以及续驶里程长等多种特点，目前混合电动汽车取代纯电动汽车巳成为各国汽车业发展的热点，根据作者研制串联式混合电动汽车的实践，从各个子系统及相互之间的匹配出发，针对混合电动汽车独特的行驶特征和工况变化，详细介绍了混合电动汽车的开发设计方法，并且为后期优化车辆的燃油经济性和排放建立了可靠的数学模型；最后给出了样车油耗和排放的测试结果，并与同型号汽车以及欧Ⅲ标准进行了对照比较。     

带选择压的兰切斯特战争模型

在兰切斯特战争数模的基础上，引入了战争选择压的概念，使兰切斯特模型可以适用于现代战争条件，提出了正规战、游击战和混合战的一般模型，使用这些模型，可以计算和预测战争。结果表明，如果美军想彻底摧毁塔利班，需要7个半月的时间；而美军委想取得新海湾战争的胜利，要付出伤亡约6．9万人的代价。     

A Heuristic for Two-Stage No-Wait Hybrid Flowshop Scheduling with a Single Machine in Either Stage

This paper studies the hybrid flow-shop scheduling problem with no-wait restrictions. The production process consists of two machine canters, one has a single machine and the other has more than one parallel machine. A greedy heuristic named least deviation algorithm is designed and its worst case performance is analyzed. Computational results are also given to show the algorithm‘s average performance compared with some other algorithms. The least deviation algorithm outperforms the others in most cases tested here, and it is of low computational complexity and is easy to carry out,thus it is of favorable application value.     

Accuracy Analysis and Calibration of Gantry Hybrid Machine Tool

IntroductionKinematic accuracy is a key factor in the design ofparallel kinematic machine tools. However,research on the accuracy of parallel kinematicmachine tools is still in its initial stage because ofthe complexities of nonlinear errors.　Structural error sensibility is an important partin structural accuracy research. Faik andErdman[1] analyzed the sensibility of four barlinkages by introducing a dimensionless errorfactor for sensibility of each leg.Wu andLankarani[2 ] used the value o…     

Controlling Torque Distribution for Parallel Hybrid Vehicle Based on Hierarchical Structure Fuzzy Logic

The Hierarchical Structure Fuzzy Logic Control (HSFLC) strategies of torque distribute for Parallel Hybrid Electric Vehicle (PHEV) in the mode of operation of the vehicle i. e. , acceleration, cruise, deceleration etc. have been studied. Using secondly developed the hybrid vehicle simulation tool ADVISOR, the dynamic model of PHEV has been set up by MATLAB/SIMULINK. The engine, motor as well as the battery characteristics have been studied. Simulation results show that the proposed hierarchical structured fuzzy logic control strategy is effective over the entire operating range of the vehicle in terms of fuel economy. Based on the analyses of the simulation results and driver's experiences, a fuzzy controller is designed and developed to control the torque distribution. The controller is evaluated via hardware-in-the-loop simulator (HILS). The results show that controller verify its value.     

基于配对函数的对称加密算法

随着网络安全问题日益突出，数据加密技术越来越受到关注，针对目前各种类型的对称算法密钥空间存在的缺陷，该文基于配对函数提出了一种对称加密算法，该算法采用了一次一密、多重算法对数据进行加密，密钥空间足够大，有效地防止了网络非法用户的唯明文攻击。该算法是一种安全性好、可靠性高、实用性强的数据加密算法。