基于GASA-FCM混合聚类与霍夫变换的欠定混合矩阵估计

针对模糊C-均值聚类(fuzzy C-means clustering,FCM)算法在欠定混合矩阵估计中精度低、鲁棒性差的缺点,提出一种基于遗传模拟退火优化FCM(GASA-FCM)混合聚类和霍夫变换的欠定混合矩阵估计算法。该算法首先结合了模拟退火算法(simulated annealing algorithm,SA)全局搜索、高精度的优点和遗传算法(genetic algorithm,GA)强大的空间搜索能力,将经遗传模拟退火算法得到的聚类中心点赋给FCM,避免了初值选择的随机性。再利用霍夫变换对聚类得到的每一类数据的中心进行修正,提高混合矩阵的估计精度。实验结果表明,提出的算法明显改善了算法的稳定性和混合矩阵估计精度,具有一定的有效性和可行性。     

基于SA的改进遗传算法的测试数据生成研究

测试数据的自动生成研究是软件测试的一个焦点问题,测试数据的自动生成可以提高测试工作效率,节约测试成本.考虑遗传算法(GA)和模拟退火算法(SA)各自优缺点,提出遗传/模拟退火(GASA)混合算法的策略,在标准的GA中融入SA,在GA的局部搜索中引入SA,SA的随机状态受限于遗传优化算法的结果,GA的种群更新是由SA的退温算法和随机状态产生函数来控制,从而得到最优解.GA-SA算法取长补短,提高了算法的全局和局部搜索能力,能避免GA过早收敛,提高了算法搜索最优解的能力.实验结果表明,GASA算法寻找最优解所需的迭代次数明显优于标准GA.     

基于改进遗传退火HMM的Web信息抽取研究

为进一步提高Web信息抽取的准确率,针对隐马尔可夫模型HMM(Hidden Markov Model)及混合法在参数寻优上的不足,提出一种改进遗传退火HMM的Web抽取算法。构建一个后向依赖假设的HMM;用改进遗传退火优化HMM参数,将遗传算子和模拟退火SA(simulated annealing)参数改进后,据GA(genetic algorithm)的自适应交叉、变异概率给子群体分类,实现多种群并行搜索和信息交换,以避免早熟,加速收敛;并将SA作为GA算子,加强局部寻优能力;最后,用双序Viterbi解码,与现有HMM优化法相比,实验的综合Fβ=1平均提高了6%,表明改进算法能有效提高抽取准确率和寻优性能。     

求解车间作业调度问题的混合遗传模拟退火算法

为了克服传统遗传算法解决车间作业调度问题的局限性,结合遗传算法(GA)和模拟退火算法(SA)的优点,提出一种混合遗传模拟退火算法(GASA),以便高效地解决车间作业调度问题.该算法既发挥了遗传算法收敛速度快、模拟退火算法搜索面广的优点,又克服了前者收敛容易早熟而后者收敛速度较慢的问题.在算法的操作细节上,加入自适应调整的遗传操作及最优个体保留策略,以及增加记忆功能的模拟退火操作与收敛准则.从而既防止了算法会陷入局部最优解的问题,又提高了算法的收敛速度及搜索效率.将提出的混合遗传模拟退火算法(GASA)应用于Muth和Thompson基准问题的实验运行,证明了该算法的高效性和有效性.     

基于GA-SA混合算法的VLSI门阵列布局设计

布局是VLSI布图设计中的关键环节，通常采用随机优化算法。该文采用遗传算法(GA)与模拟退火法(SA)相结合的搜索算法实现VLSI门阵列模式布局，利用遗传算法进行全局搜索，模拟退火法进行局部搜索。进化过程中采用精英保留策略，并对进化结果进行有选择的模拟退火操作，这样既加强了局部搜索能力又防止陷入局部最优。在复合布局目标函数中引入对最长线网的惩罚，其收敛速度比以总线长度为单一目标函数的要快。在交叉操作中，对交叉位置的选择采用了一种新的策略，增加了交叉的有效性。实验表明，此算法与简单遗传算法相比，有效地提高了全局搜索能力。     

SAGA在测试数据自动生成中的应用

结合遗传算法（GA）的并行搜索结构和模拟退火算法（SA）的概率突跳性,并结合自适应交叉算子和遗传算子,形成了一种新的自适应SAGA混合优化算法。在测试数据自动生成系统中,经过实际程序的实验,表明该算法有更强的搜索能力,可以更快的找到全局最优解。     

基于IAG-ABC算法的路径覆盖测试用例生成技术

针对遗传算法(genetic algorithm,GA)存在搜索初期收敛速度过快、易陷入局部最优解、未能充分结合搜索过程中的反馈信息,同时人工蜂群(artificial bee colony,ABC)算法存在初期寻优速度缓慢、局部搜索具有很大随机性等问题,对遗传算法和人工蜂群算法分别进行了改进,并将改进后的两种算法进行融合,实现两者的优势互补,提出了一种自适应遗传-蜂群（improved adaptive genetic-artificial bee colony, IAG-ABC）算法。采用路径覆盖信息设计引导算法搜索方向的适应度函数,并用IAG-ABC算法实现路径覆盖的测试用例生成,实验结果表明,相对于标准遗传算法和自适应遗传算法,IAG-ABC算法在测试用例生成效率和覆盖率上均有一定的优势。     

基于遗传模拟退火算法的立体仓库储位优化

针对自动化立体仓库储位分配问题,结合仓库运作特点和安全性要求,构建了自动化立体仓库储位优化问题的多目标模型,并提出了求解模型的基于Sigmoid曲线的改进自适应遗传模拟退火算法（SAGA）。首先,以降低货品出入库时间、同组货品距离和货架重心为目标建立储位优化模型;然后,为了克服遗传算法（GA）局部搜索能力差和易陷入局部最优的缺点,引入基于Sigmoid曲线的自适应交叉变异操作和逆转操作,同时完成与SAGA的融合;最后,对改进遗传SAGA进行算法优化性、稳定性和收敛性测试。仿真实验表明,相比模拟退火（SA）算法的求解结果,该算法对货品出入库时间的优化度提高了37.7949个百分点、对同组货品距离提高了58.4630个百分点、对货架重心优化度提高了25.9275个百分点,并且该算法具有更好的稳定性和收敛性。由此验证了改进遗传SAGA求解问题的有效性,该算法可为自动化立体仓库储位优化提供决策方法。     

基于混合遗传模拟退火算法的SaaS构件优化放置

目前,对于SaaS优化放置问题的研究都是假定云环境中的虚拟机的种类和数量都是确定的,即,在限定的资源范围内进行优化.然而,在公有云环境下,SaaS提供者所需要的云资源数量是不确定的,其需要根据Iaa S提供者所提供的虚拟机种类以及被部署的SaaS构件的资源需求来确定.为此,站在SaaS提供者角度,提出一种新的SaaS构件优化放置问题模型,并采用混合遗传模拟退火算法(hybrid genetic and simulated annealing algorithm,简称HGSA)对该问题进行求解.HGSA结合了遗传算法和模拟退火算法的优点,克服了遗传算法收敛速度慢和模拟退火算法容易陷入局部最优的缺点,与单独使用遗传算法和模拟退火算法相比,实验结果表明,HGSA在求解SaaS构件优化放置问题方面具有更高的求解质量.所提出的方法为SaaS服务模式的大规模应用提供了理论与方法的支撑.     

基于遗传模拟退火算法的无线传感器网路由协议

在无线传感器网络中(WSNs)中,由于节点能量有限,为了延长整个网络的生存周期,提出一种基于遗传模拟退火算法的无线传感器网络路由协议.利用模拟退火(SA)算法具有较强的局部搜索能力并能以稳定的速度收敛,克服遗传算法(GA)局部搜索能力差并容易早熟收敛等缺点.该路由协议在簇头节点选举时充分考虑了节点的剩余能量,并根据网络中数据转发能量耗损和延迟时间建立个体适应度函数,采用遗传模拟退火算法找到簇头节点到基站的最优路径.仿真结果表明:与其他协议比较,该方法不仅可以均衡各个节点的剩余能量,还可以有效延长整个网络生存周期和提高网络的数据传输能力.     

Call for Papers The 6^th International Conference on Grid and Cooperative Computing

Recent years have seen rapid advances in various grid-related technologies, middleware, and applications. The GCC conference has become one of the largest scientific events worldwide in grid and cooperative computing. The 6th international conference on grid and cooperative computing (GCC2007) Sponsored by China Computer Federation (CCF),Institute of Computing Technology, Chinese Academy of Sciences (ICT) and Xinjiang University ,and in Cooperation with IEEE Computer Soceity ,is to be held from August 16 to 18, 2007 in Urumchi, Xinjiang, China.     

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.     

法律信息库系统

本文分析了法律数据库的结构和特点，介绍了采用面向对象设计方法和超文本数据库技术开发和实现法律信息库系统将作为重要网络资源之一为不同用户进行法律咨询服务。     

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.     

International Journal of Automation and Computing Table of Contents

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Information for authors

正SCIENCE CHINA Information Sciences(Sci China Inf Sci),cosponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China,and published by Science China Press,is committed to publishing highquality,original results of both basic and applied research in all areas of information sciences,including computer science and technology;systems science,control science and engineering(published in Issues with odd numbers);information and communication engineering;electronic science and technology(published in Issues with even numbers).Sci China Inf Sci is published monthly in both print and electronic forms.It is indexed by Academic OneFile,Astrophysics Data System(ADS),CSA,Cabells,Current Contents/Engineering,Computing and Technology,DBLP,Digital Mathematics Registry,Earthquake Engineering Abstracts,Engineering Index,Engineered Materials Abstracts,Gale,Google,INSPEC,Journal Citation Reports/Science Edition,Mathematical Reviews,OCLC,ProQuest,SCOPUS,Science Citation Index Expanded,Summon by Serial Solutions,VINITI,Zentralblatt MATH.     

Erratum to: Fast global kernel fuzzy c-means clustering algorithm for consonant/vowel segmentation of speech signal

正Erratum to:J Zhejiang Univ-Sci C(ComputElectron)2014 15(7):551-563doi:10.1631/jzus.C1300320The original version of this article unfortunately contained mistakes.Algorithm 6 should be as follows:Algorithm 6 FGKFCM-F clustering Input:(1)X={x_1,x_2,…,x_N},,x_iR~d,i=1,2,…,N,the dataset;(2)C,1C≤N,the number of clusters;(3)ε0,the stopping criterion;     

Journal of Zhejiang University-SCIENCE C (Computers & Electronics) Total contents

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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.