基于多Agent系统和神经网络的路由选择策略

我国长信网的接通率为45%左右,链路的利用率也仅为30%～40%.据估计,接通率 每提高一个百分点,收益可达10亿元,针对目前所使用的路由选择方法的不足,提出全新的基 于多Agent系统和神经网络预测的路由选择策略,包括网络模型、选路过程、Agent内涵的刻 划,并介绍了用递归神经网络进行预测的思想.仿真结果表明,其良好的分布性和智能预测能力 使之优于其它方法.这为解决网络接通率低和负荷不平衡问题提供了良好途径.     

无级电话网动态路由策略的研究

无级电话网的动态路由技术能有效降低呼损、提高接通率。本文针对所开发的一个集中式、全局优化无级电话网动态路由策略选择系统进行综述；详细分析了求解路由方案的四种算法；介绍了该系统的实现、运行情况和话务模拟结果；该系统在广东省长话网得到了良好的应用。     

基于预测的链路资源决策模型

无论是电信网还是计算机网 ,路由问题都是一个关键技术 ,路由算法的优劣直接影响着网络呼叫的接通率和负荷平衡情况 .本文针对我们提出的用于 S1 2程控交换机的新的路由选择策略 ,给出基于对策论的链路选择的预测决策模型 .     

一种减少网络振动的智能路由选择算法设计

近来,研究人员开始关注基于数据驱动的智能网络协议设计方法,以此取代依赖人类专家的传统协议设计方式.智能化路由技术也随之得到快速发展,但仍存在亟待解决的问题.研究了当前智能路由算法在路由更新过程中带来的大范围路由抖动以及转发效率下降问题.提出了 一种路由抖动抑制的智能路由选择算法FSR(flap suppression routing),在追求全网链路负载均匀、转发资源高利用率的同时,寻求与现有路由策略最相似的更新方案,使得每个路由更新周期的路由抖动减小,缩短路由收敛时间,提升网络整体转发性能.实验表明:FSR算法能显著提升路由收敛速度,与对照算法相比提升约30％的网络吞吐量,同时降低路径长度和拥塞概率.     

利用话务模拟技术分析电话网动态路由策略的性能

本文以动态控制选路和动态迂回选路两种动态路由策略为研究对象，采用话务模拟技术研究其应用于我国长途电话网后的网络运行情况，定量评估了动态选路所能带来的网络接通率和网络适应故障能力的提高，并对ＤＡＲ算法中继预留参数的选择进行了研究。     

分布式智能视频监视系统设计与实现

本文介绍了基于计算机网络的分布式智能视频监控系统的设计思路和实现方法,详细讨论了在局域和广域网络环境下分布式智能视频监控系统的网络结构及在数字监控系统中外接电视墙功能的实现方法,并以此为基础,提出了数字监控系统中自治系统,视频桥和远程视频代理的概念;给出一种动态频路由选择算法的设计与实现方法。     

IMS接入网关智能路由

在数字电话交换系统中设计IMS接入网关以解决目前将语音应用接入到CM-IMS网络中等问题,其中设计接入网关的智能路由支持在IP或TDM中继故障后自动重选,根据实际需求配置中继选路的策略以达到局间通信的可靠性和费用最低的要求。介绍了IMS接入网关的应用及研究现状,阐述Asterisk的具体情况,描述了IMS接入网关智能路由的功能,并给出智能路由的详细设计,路由的属性及数据结构的定义,最后结合 Asterisk 开源项目,实现了智能路由的功能,通过实验成功验证了智能路由按费率、优先级、轮转策略选择中继及号码变换的功能,达到了通信的可靠性及低费用的要求。     

分布式智能视频监控系统设计与实现

本文介绍了基于计算机网络的分布式智能视频监控系统的设计思路和实现方法,详细讨论了在局域和广域网络环境下分布式智能视频监控系统的网络结构及在数字监控系统中外接电视墙功能的实现方法,并以此为基础,提出了数字监控系统中自治系统、视频桥和远程视频代理的概念;给出一种动态视频路由选择算法的设计与实现方法．     

MANET通信网络中基于状态感知与IPSO的路由搜索与优化

报告了MANET网络结构、应用特点以及在路由选择、传输性能自适应方面的现状.针对目前MANET网络节点的智能化程度不高,网络节点及其通信路由的性能参数不能随通信条件适时优化的实际问题,运用状态感知路由选择与免疫微粒群优化算法原理,提出了人工智能与MANET相结合的智能MANET网络结构,论述了智能MANET网络中基于状态感知和免疫微粒群优化算法的路由选择、切换与性能适时优化方法.仿真实验结果表明,该方法的收敛速度与优化质量均优于其它算法.     

传统路由的进阶攻略

正虽然备受瞩目,但智能路由到现在为止还处于"概念股"的阶段,可供我们选择的产品不多,而且在功能层面还有很多值得深入挖掘的空间。因此智能路由更适合首次为家里添置路由器的用户选择。而对已经用上传统路由器的用户而言,通过一系列的进阶设置和优化,传统路由也能"翻译"出很多智能路由所标榜的功能呢。     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.     

A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.     

The Distributed Time-Triggered Simulation Scheme: Core Principles and Supporting Execution Engine

Distributed real-time simulation is a young technology field but its practice is under increasing demands. In recent years the author and his collaborators have been establishing a new approach called the distributed time-triggered simulation (DTS) scheme which is conceptually simple and easy to use but widely applicable. The concept was initiated in the course of developing a new-generation object-oriented real-time programming scheme called the time-triggered message-triggered object (TMO) programming scheme. Some fundamental issues inherent in distributed real-time simulation that were learned during recent experimental studies are discussed along with some approaches for resolving the issues. An execution engine developed to support both the TMOs engaged in control computation and the TMOs engaged in DTS is also discussed along with its possible extensions that will enable significantly larger-scale DTSs.     

Software-Konfigurationsmanagement in großen Softwareprojekten

Zusammenfassung Mit zunehmender Größe der Softwaresysteme verschärfen sich die für die Software-Herstellung typischen Probleme: Beherrschen großer Objektmengen, Erhalten der Systemkonsistenz, Kontrolle der ständigen Änderungseinflüsse und Gewährleisten einer langen Lebensdauer. Die Disziplin Konfigurationsmanagement bildet den methodischen Ansatz, diese Probleme besser zu beherrschen. Software-Konfigurationsmanagement faßt die Herstellung von Softwaresystemen als eine Abfolge von kontrollierten Änderungen an gesicherten Zwischen- und Endergebnissen auf. Dargestellt werden die Objekte und Funktionen des Software-Konfigurationsmanagements sowie die hierfür in großen Software-Projekten benötigten Methoden, Instanzen und Hilfsmittel.     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and     

Editorial:Brain-machine interface(BMI) and cyborg intelligence

正Brain-machine interfaces(BMIs)aim at building a direct communication pathway between the brain and an external device,and represent an area of research where significant progress has been made during the past decade.Based on BMIs,mind information can be read out by neural signals to control     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate     

SCIENCE CHINA Information Sciences SUBJECT INDEX TO VOLUME 57(2014)

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Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate