具有混沌差分进化搜索的人工蜂群算法

针对人工蜂群算法的不足,结合差分进化算法中的变异思想,提出一种改进的人工蜂群算法。其基本思想是在标准人工蜂群算法中观察蜂更新蜜源的阶段,使用差分进化算子对蜜源进行更新,在差分变异算子中引入混沌序列,以提高观察蜂在此阶段的局部搜索能力,最终获得最优蜜源。仿真结果表明,引入混沌差分进化搜索的蜂群算法无论在解的求解精度上还是算法的收敛速度上均优于标准人工蜂群算法,适合于复杂函数的全局优化问题。     

引入模拟退火算子的差分进化算法性能研究

为了提高差分进化算法的优化性能,将模拟退火算子引入到差分进化算法中,利用模拟退火算子良好的全局搜索能力进一步提高差分进化算法对复杂问题的优化能力．通过对复杂函数优化的仿真结果表明,算法在求解复杂优化问题上具有更快的收敛速度和更好的全局收敛性．     

基于分段搜索策略的自适应差分进化人工蜂群算法

针对人工蜂群算法在求解函数优化问题时存在的探索能力强,而开发能力不足和收敛性能差的问题,本文提出一种基于分段搜索策略的自适应差分进化人工蜂群算法。该算法将改进后的差分进化算法中的变异操作引入到观察蜂的局部搜索策略中,让观察蜂在雇佣蜂逐维变异后的当前最优解周围进行局部搜索,并采用分段搜索的方式更新蜜源,以提高其局部搜索能力。仿真实验结果表明,与基本人工蜂群算法相比,改进后的算法有效地平衡了算法的探索能力和开发能力,并提高了算法的寻优精度和收敛速度。     

分布式人工蜂群免疫算法求解函数优化问题

为了克服人工蜂群算法由于开发能力较弱而导致收敛速度慢、搜索精度不高等缺点,结合子蜂群思想和免疫克隆选择算法,提出一种基于分布式精英进化模型的人工蜂群免疫算法。首先对外层子蜂群进行启发式快速人工蜂群操作以提高收敛速度;然后对内层精英蜂群进行免疫克隆选择操作,进一步提高了算法的收敛精度和全局搜索能力。仿真结果表明了该算法在求解函数优化问题上的有效性和优越性。     

基于混沌局部搜索算子的人工蜂群算法

在求解函数优化问题时,为了提升人工蜂群算法局部搜索能力,提出了一种新颖的混沌蜂群算法。新算法设计了一种混沌局部搜索算子,并将其嵌入蜂群算法框架中;该算子不仅能够实现在最优食物源周围局部搜索,还能够随着进化代数增加使搜索范围不断缩小。仿真实验结果表明,与人工蜂群算法相比,新算法在Rosenbrock函数上,求解精度和收敛速度明显占优;此外新算法在多模函数Griewank和Rastrigin上,收敛速度明显占优。     

具有人工蜂群搜索策略的差分进化算法

针对差分进化算法易出现早熟现象和收敛速度慢等问题,提出一种具有人工蜂群搜索策略的差分进化算法.利用人工蜂群搜索策略很强的探索能力,对种群进行引导以帮助算法快速跳出局部最优点.此外,为了提高算法的全局收敛速度,采用一种基于反学习的初始化方法.通过对12个标准测试函数进行仿真实验并与其他算法相比较,表明了所提出的算法具有较快的收敛速度和很强的跳出局部最优的能力.     

多搜索策略协同进化的人工蜂群算法

针对人工蜂群算法存在的计算精度不高、收敛速度较慢的缺点,提出一种多搜索策略协同进化的人工蜂群算法.所提出的算法在引领蜂和跟随蜂进行邻域搜索时,动态调整搜索的维数以提高搜索效率,并结合人工蜂群算法不同搜索策略的特点,使其协同进化,以平衡算法的局部搜索能力和全局搜索能力.14个基准函数的仿真实验结果表明,所提出的算法能有效改善寻优性能,增强摆脱局部最优的能力.与其他一些改进的人工蜂群算法相比,具有较快的收敛速度和较高的求解精度.     

一种双种群差分蜂群算法

人工蜂群算法(ABC)是一种基于蜜蜂群智能搜索行为的随机优化算法.为了有效改善人工蜂群算法的性能,结合差分进化算法,提出一种新的双种群差分蜂群算法(BDABC).该算法首先通过基于反向学习的策略初始化种群,使得初始化的个体尽可能均匀分布在搜索空间,然后将种群中的个体随机分成两组,每组采用不同的优化策略同时进行寻优,并通过在两群体之间引入交互学习的思想,来提高算法的收敛速度.基于6个标准测试函数的仿真实验表明,BDABC算法能有效避免早熟收敛,全局优化能力和收敛速率都有显著提高.     

基于单纯形算子的混合差分进化算法

针对DE／rand／1／bin方案收敛速度慢的缺点,提出一种将单纯形确定性算法和差分进化随机搜索算法相结合的混合优化算法。利用差分进化算法搜索范围广、全局搜索能力强和单纯形算法局部搜索能力强、收敛速度快的特性,较大地提高了差分进化算法的收敛速度和搜索精度。典型Benchmarks复杂函数优化实验表明,该算法优化效率高、优化性能好、对初值具有较强的鲁棒性,性能优于单一的优化方法。     

一种新颖的函数优化进化算法

进化算法在求解全局优化问题时易陷入局部最优且收敛速度慢. 为了解决这一问题, 设计了一个基于下降尺度函数的杂交算子, 利用下降尺度函数与种群的关系来寻找实值函数的下降方向. 为了提高非均匀变异算子在进化后期的搜索能力, 通过均衡算子的局部搜索和全局搜索能力使其在算法后期仍能跳出局部最优. 在此基础上给出了一种新的进化算法. 最后将其与9个现有的算法进行了比较, 数值实验表明新算法快速有效.     

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