基于粒子群算法的混洗蛙跳算法

基于模因进化的演化算法是一种模拟自然界生物进化或社会种群活动的随机搜索方法。本文介绍一种基于新的智能搜索算法——混洗蛙跳算法的改进演化算法。对SFLA算法和PSO算法的基本原理进行阐述,为了更好地改进SFLA算法局部搜索能力差、收敛速度降低,将粒子群优化算法（PSO）与混洗蛙跳算法（SFLA）相结合,提出一种改进的混洗蛙跳算法（SFLA）,能够提高算法的局部搜索能力和稳定性。该算法比上述两种算法具有更好的性能,特别是对函数优化等问题计算效果更好。     

基于免疫进化的粒子群混洗蛙跳算法

为了避免混洗蛙跳算法易于出现不成熟收敛,提高求解质量,提出了基于免疫进化的粒子群混洗蛙跳算法。该算法将粒子群算法中粒子追踪全局极值的思想融入混洗蛙跳算法中,对族群内的最差个体同时跟踪族群内和全局两个最优个体的信息,进行深度搜索;并引入免疫进化算法对群体中的最优个体进行免疫进化迭代计算,以达到充分利用最优个体的信息的目的。该算法不仅避免了陷入局部极值的局限,以更高的精度逼近全局最优解,而且能加速收敛。对多个典型测试函数的计算表明：基于免疫进化的粒子群混洗蛙跳算法比传统的混洗蛙跳算法具有更好的寻优能力、稳定效果和更快的收敛速度。     

面向多峰函数优化的PASFLI算法及应用

针对基本混合蛙跳算法在高维多峰函数优化时早熟及难以找到所有全局极值的问题,提出了一种具有混合智能的多态子种群自适应混合蛙跳免疫算法,证明了算法以概率1收敛于全局最优解。该算法采用双层进化模式,融合了混合蛙跳、免疫克隆选择技术。在低层混合蛙跳操作中,加入了多态自适应子种群机制,提高了子种群多样性,有效抑制了早熟现象;在算法进化后期,提出了全局极值筛选策略,将子种群极值点提升到高层免疫克隆选择操作,进一步提高了全局寻优能力。通过复杂多峰函数仿真实验,表明该算法能够快速有效地给出全部全局最优解。     

基于QPSFLA算法的云计算环境资源调度策略

针对云计算环境下的资源调度优化问题,提出了一种基于量子粒子群策略的混洗蛙跳改进算法(简称QPSFLA算法),旨在引入量子粒子群搜索策略防止传统混洗蛙跳算法容易陷入局部最优的问题。在CloudSim平台上的模拟试验结果表明,QPSFLA算法能够达到预期效果,而且比平台自带算法和传统混洗蛙跳算法效率更高。     

混洗蛙跳算法的研究

混洗蛙跳算法是一种基于启发式搜索的算法,通过启发函数进行搜索,从而找到组合优化问题的解。该文介绍了混洗蛙跳算法的产生发展以及基本原理和流程,并对以后做了展望。     

一种新的改进的混合蛙跳算法

针对混合蛙跳算法在优化过程中受初始值影响较大且容易陷入局部最优的缺陷,提出了一个改进的混合蛙跳算法,该算法利用基于对立学习的策略产生初始种群,提高了产生解的质量;在进化过程中,将差分进化有机地嵌入其中,维持了种群的多样性。数值结果表明,改进的混合蛙跳算法对复杂函数优化问题具有较强的求解能力。     

多种群粒子群算法与混合蛙跳算法融合的研究

针对粒子群算法和混合蛙跳算法在复杂函数寻优上易于陷入局部最优值的缺点,提出一种新的粒子群与混合蛙跳融合算法.算法采用多种群粒子群方法,每次进化后,将各子群中的最优粒子组成新的群体,采用混合蛙跳模式进化,以提高种群的多样性.粒子群各子群的进化模式中,除考虑本子群最好的粒子外,还考虑整合群体最好的粒子.相对于其它一些改进的粒子群或混合蛙跳算法,融合算法概念简单,易于实现,具有良好的全局搜索能力和较快的收敛速度.基准测试函数的仿真结果表明,本文算法优于目前一些常见的改进粒子群算法.     

基于分子动力学模拟的改进混合蛙跳算法

针对基本的混合蛙跳算法(Shuffled frog leaping algorithm,SFLA)后期搜索速度变慢,容易陷入局部最优解的缺点,借鉴分子动力学(Molecular dynamics,MD)模拟的思想,提出一种基于分子动力学模拟的改进的混合蛙跳算法。该算法将种群中的粒子等效成分子,并提出一种新的分子间作用力计算方法来代替两体间经典的Lennard-Jones作用力计算方法,利用Velocity-Verlet算法和高斯变异算子代替基本混合蛙跳算法的更新策略,有效地平衡了种群的多样性和搜索的高效性。高维多峰函数测试的结果表明,基于分子动力学模拟的改进混合蛙跳算法能提高算法后期跳出局部极值的能力,全局寻优能力明显优于基本的混合蛙跳算法。     

一种新颖的差分混合蛙跳算法

在使用智能优化算法处理函数优化问题时,保持种群的多样性及加快种群的收敛速度可以提升一个算法的性能.针对混合蛙跳算法在寻优过程中易陷入局部最优和早熟收敛的缺点,本文提出了一种新颖的差分混合蛙跳算法.该算法借鉴差分进化中的变异交叉思想,在前期利用子群中其他个体的有用信息来更新最差个体,增加局部扰动性,以提高种群的多样性;在后期为加快收敛速度使用最好个体的信息进行变异交叉操作.同时本文使用归档集进一步保留种群的多样性.仿真测试结果表明:该算法在求解优化问题时较基本蛙跳算法和平均值蛙跳算法具有更好的寻优性能.     

基于解空间反向跳跃和信息交互强化的新型混合蛙跳算法

种群多样性和信息交互的深度与方式对混合蛙跳算法的爬山能力、探索能力和开发能力有着深远影响.针对混合蛙跳算法易于陷入局部最优、收敛速度慢和寻优精度差等缺点,提出一种基于解空间反向跳跃和信息交互强化的新型混合蛙跳算法.首先,增加子群次优解与次劣解的信息交互,促进子群内部信息的利用,引入反向跳跃思想改进局部更新机制,降低迭代后期劣解产生概率,提升空间开发能力;然后,借鉴2-opt方法实现局部最优解变异,增加子群的多样性;最后,采用各局部最优解交叉的方式加深子群间的交互深度,同时利用反向跳跃机制防止种群同化.采用23个单峰、多峰和固定维度下的复杂多峰函数作为测试集进行仿真实验,结果表明所提出算法具有更优的搜索性能,能够有效提高种群多样性,防止算法早熟收敛,且能够适应不同类型的函数优化问题.     

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.     

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.     

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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