一种新型遗传算法的研究

根据自然界普遍存在的进化收敛现象．本文提出了一种新型的混合遗传算法(Mix genetic algorithm．MGA)。MGA算法将生物的进化过程建模成一个在表现型与基因型两个层面上同时进行的生命过程。MGA不仅考虑了表现型层面上的进化过程，还引入了基因型层面上的进化及两个层面问的相互映射关系。本文通过二维Rosenbrock函数数值优化的例子．展示了MGA良好的在线性能指标和离线性能指标，并分析了MAG算法实际上是“r—K策略连续统”。理论分析表明．MGA算法总能以概率1收敛于最优解。MGA算法性能优良，容易编程实现，并在一定程度上克服了基本遗传算法搜索时的盲目性．有较好的应用前景。最后文中给出了计算机仿真结果。     

基于负压波的管道泄漏检测与定位技术研究

管道输送因其具有独特的优点已经在各行各业中得到了广泛应用，但日益严重的泄漏问题不仅影响了管输的正常运行，也给人类的生命财产造成了极大的损失。探索一种有效的检测方法已经迫在眉睫。文章对基于负压波的管道泄漏检测与定位技术的方法进行了研究，说明了其优缺点，指出了基于负压波法的管道泄漏检测与定位结构模式识别系统具有很好的发展前景。     

On the security of a chaotic encryption scheme: problems with computerized chaos in finite computing precision

Zhou et al. have proposed a chaotic encryption scheme, which is based on a kind of computerized piecewise linear chaotic map (PWLCM) realized in finite computing precision. In this paper, we point out that Zhou's encryption scheme is not secure enough from strict cryptographic viewpoint. The reason lies in the dynamical degradation of the computerized piecewise linear chaotic map employed by Zhou et al. The dynamical degradation of the computerized chaos induces many weak keys to cause large information leaking of the plaintext. In addition, we also discuss three simple countermeasures to enhance the security of Zhou's cryptosystem, but none of them can essentially enhance the security.     

域内域间和自组网IP组播路由协议分析

系统地综述了IP组播的基本实现协议，分析组播域内、组播域间和无线移动网的组播路由协议的基本原理和工作性能，并比较不同协议设计实现的主要区别。     

变电站远程视频监控系统

本文介绍了变电站远程视频监控系统的组成，并对其关键技术进行了探讨。     

预取技术研究进展

World Wide Web(WWW) services have grown to levels where significant delays are expected to happen.Technology like prefetching are likely to help users to personalize their needs ,reducing their waiting times. This paperfirstly describes the architecture of prefetching,then classifies them into three types: based on branch model,based ontree model and others and presents profoundly the basic ideas of some existing prefetching algorithms. Next,several models for controlling the prefetching are introduced. At last,the trend and course concerning the prefetching algo-rithms are concluded.     

临钢6#高炉含硅量预测的计算机在线实现

临钢6＃高炉铁水中硅质量分数的预测是“高炉专家系统”中的一部分，为了使预测模型能够在线进行，采用了限定记忆法进行模型参数的辨识，对辨识出来的参数用牛顿法进行优化，并且用鼓风机动能和风量，风温2种方法对预测模型的预测值进行了修正，使命中率提高了4－5个百分点，给出了数据库系统的组织以及计算机实现的流程图。该方法使模型的预测命中率与离线预测的水平相当。     

Fault-Tolerant Broadcasting in 2-D Wormhole-Routed Meshes

In this paper, a fault-tolerant broadcast scheme in 2-D meshes with randomly generated faults is provided. This approach is based on an early work on time-step optimal broadcasting in square-shape fault-free 2-D meshes with optimal total communication distance (TCD). An extension to any rectangular-shape fault-free 2-D meshes is first given. The fault block model is used in which all faulty nodes in the system are contained in a set of disjoint blocks. The boundary lines of blocks divide the whole mesh into a set of fault-free polygons and a sequence of rectangular fault-free regions is derived from these polygons. The broadcast process is carried out at two levels: inter-region and intra-region. In the inter-region-level broadcast, the broadcast message is sent from a given source to a special node (called eye [1]) in each rectangular fault-free region. In the intra-region-level broadcast, the extended optimal fault-free broadcast is applied. Some analytical results are given including an upper bound of TCD.     

SOCKS服务器性能测试工具的研究与实现

该文在分析SOCKS协议的实现原理和过程的基础上,讨论并实现了运行在Linux操作系统上,支持SOCKSv5协议和TCP协议,测试SOCKS服务器并发连接数量和吞吐量两项关键性能的软件工具。并以NEC提供的SOCKS服务器软件包Socks5Server为测试对象,并给出了性能测试结果。     

基于置信度的手写体数字识别多分类器动态组合

多分类器组合利用不同分类器、不同特征之间的互补性，提高了组合分类器的识别率。传统的组合方法里，各分类器在组合中所承担的角色是固定的，而实际应用中，对于不同的测试样本，每个分类器识别结果的可信度是不同的。该文根据分类器置信度理论，提出了各类别的置信度。用测试样本自身的置信度信息实现分类器的动态组合，并把这种动态组合方法具体应用到手写体数字的识别。这种方法还可以在不影响已有数据的情况下添加新的分类器进行组合。