基于粒子群参数优化的同构双种群蚁群算法

针对蚁群算法易陷入局部最优、收敛速度较慢的问题,提出一种基于粒子群参数优化的同构双种群蚁群算法。将蚂蚁均分为两个子群,第一子群引入单位距离信息素路径构建算子,加强距离因素和信息素因子的协同作用;第二子群引入粒子群优化算法,对蚁群算法的多个参数在三维空间中进行优化,提高了解的质量。两个种群在参数方面优势互补并进行协同交流,共同促进算法找到全局最优解。针对TSP问题,实验表明,所设计的算法增强了算法的种群多样性。     

基于改进蚁群算法的三维航迹规划

针对蚁群算法在无人机（UAV）三维航迹规划中存在的收敛速度慢、空间复杂度高的缺点,提出了一种基于改进蚁群算法的无人机（UAV）三维航迹规划方法。该方法改进了局部搜索策略、初始信息素调整因子并在启发函数中加入了路径偏移因子,从而降低了航迹搜索空间的复杂度,提高了算法的搜索效率和收敛速度。在利用DEM数字高程数据建立的搜索空间中,该算法与现有算法相比,规划航迹缩短约24.08%,运行时间减少约11.56%,表明改进蚁群算法在无人机（UAV）三维航迹规划中的可行性和有效性。     

无人机三维航迹规划算法研究

在模拟仿真出无人机三维飞行环境的基础上,根据航迹规划的要求,建立对应数学模型,并采用蚁群算法进行优化仿真.针对基本蚁群算法存在的搜索时间长、容易陷入局部最优解等缺点,将蚂蚁当前位置与目标位置的距离信息反馈到系统中作为航迹规划的控制信息,同时对航迹节点的选择方法进行改进,以提高算法的效率.仿真实例结果表明,该算法可以规划出满足无人机飞行要求的航迹.     

固定翼巡线无人机实时蚁群算法路径规划

本文针对传统蚁群算法局部早熟等问题对算法进行了改进,并对无人机路径规划及重规划多条件约束问题进行了研究,提高蚁群算法航迹规划计算速度及全局性来满足实时蚁群算法航迹规划要求。文章针对传统蚁群算法的早熟问题采用全局与局部信息素互补衰减法,来高效完成蚁群算法寻优问题,并当无人机偏离航线时能及时根据无人机所在位置重新规划。通过实验结果得出蚁群算法具有快速的计算能力,能在短时间内对更改的路径进行响应,完成无人机自校正航迹规划。     

蚁群与粒子群混合算法求解TSP问题

旅行商问题（TSP）是最古老而且研究最广泛的组合优化问题。针对TSP问题,提出一种蚁群与粒子群混合算法（HAPA）。HAPA首先将蚁群划分成多个蚂蚁子群,然后把蚂蚁子群的参数作为粒子,通过粒子群算法来优化蚂蚁子群的参数,并在蚂蚁子群中引入了信息素交换操作。实验结果表明,HAPA在求解TSP问题中比传统算法和同类算法更具优越性。     

基于改进蚁群算法的无人飞行器航迹规划

无人飞行器航迹规划是现代战争中实施远程精确打击,提高飞行器实际作战效能的关键技术。蚁群算法作为一种启发式仿生优化算法,能够有效应用于航迹规划中。针对基本蚁群算法在应用中容易过早陷入局部最优解这一缺点,提出自适应动态双种群蚁群算法的改进策略,通过信息素的震荡变化和挥发系数的自适应调整,扩大搜索空间,提高算法搜索的全局性。并将改进后的算法应用于无人飞行器航迹规划,通过实验仿真,证明了此改进算法在航迹规划应用中的可行性和有效性。     

基于改进蚁群算法的机器人路径规划算法

针对机器人路径规划中,传统蚁群算法收敛速度慢、易陷入局部最优解等问题,提出了一种移动机器人路径规划的改进蚁群优化(ACO)算法。用栅格法建立环境模型,并基于人工势场建立启发信息素矩阵,降低了蚂蚁在初始阶段搜索的盲目性;引入激励函数,降低搜索过程中的死锁现象;改进信息素的更新机制,增强了优秀蚂蚁对全局路径规划的影响。仿真结果表明:改进后蚁群算法的机器人路径规划算法加快了收敛速度,具有较强的鲁棒性和全局寻优能力。     

基于自适应蚁群算法的救援直升机航迹规划

基本蚁群算法在航迹规划的应用中缺乏足够的鲁棒性,存在收敛性能较差的问题,针对基本蚁群算法容易出现局部停滞的现象,提出了一种自适应蚁群算法的救援直升机航迹规划方法,建立了救援距离最短和救援效率最高的数学模型.为了保持搜索的平衡性和收敛性,自适应蚁群算法从信息素挥发系数和信息索强度两个方面动态地调整信息素,并根据救援目标的紧急程度对信息素参数化.仿真结果表明,改进的蚁群算法避免了出现局部最优,有效地提高了搜索收敛速度.     

基于统计分析的自适应蚁群算法及应用

路径规划是机器人关键技术之一。利用改进的蚁群算法进行机器人的路径规划。针对传统蚁群算法收敛速度慢且易陷入局部最优解的缺陷,在Ant Colony System算法基础上,对每代蚁群动态随机统计分析,提取最优、平均和最差的蚂蚁信息,构成自适应算子用于局部信息素的自适应更新。仿真实验结果证明该自适应算子在平衡增加收敛速度和陷入局部最优解矛盾的问题中是有效的。     

基于改进蚁群算法的机器人全局路径规划研究

针对蚁群算法在机器人路径规划过程中出现的收敛速度慢的缺陷,提出了基于改进蚁群算法规划机器人全局路径,在栅格地图中划定优选区域,并建立新的初始信息素浓度设置模型,对各点初始信息素浓度进行差异化设置,避免寻优的盲目性,提高了算法的收敛速度。实验结果表明,改进后的蚁群算法的收敛速度明显加快,优于传统算法,表明了该算法的有效性。     

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)

正~~     

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