高速公路网入口流量控制的双层规划模型及算法

建立双层规划模型用于解决高速公路网的入口流量控制问题。提出了一种结合遗传算法和Aloplex算法的新算法——GAA算法来求解双层规划问题。实验结果表示，GAA算法在求解双层规划问题上优于遗传算法；分车型测算得出进入路网的流量使上层目标函数值更小（相对于单车型情况），并且使路网利用程度得到进一步的提高。     

城市交通噪声环境承载力分析模型及算法

以城市噪声环境容量为约束条件计算城市区域路网最大交通承载力。分析模型是一个双层优化问题,其中上层是噪声环境容量约束下的最大路网交通流量模型;下层是道路网上的用户均衡分配模型。应用遗传算法进行求解,仿真示例表明该模型和算法是可行的、有效的,可以为城市交通可持续发展的规划和需求管理提供依据。     

基于遗传算法的停车约束下城市路网承载力分析模型

针对动静交通不平衡的情况,分析了停车容量约束下的路网承载力。建立了停车约束下路网容量与起止点（OD）分布优化的双层优化模型,通过该模型可对路网容量与OD分布同时进行优化,从而可得停车约束下的路网承载力。利用遗传算法求解,通过算例分析验证了模型的有效性。     

饱和路网中动态交通分配和控制一体化建模研究

对饱和路网中动态交通分配和交叉口信号控制的一体化建模进行了研究 .描述了一个双层规划问题 .上层以动态用户均衡为目标建立分配模型 ,下层以系统最优为目标进行信号设置 .考虑了饱和路段上的车辆排队行为和驾驶员路径选择行为 ,并在模型中加以描述 .最后将遗传算法与传统的非线性最优规划方法相结合求解了一体化模型     

基于层次遗传算法的物流配送中心选址策略*

在考虑物流规划部门和客户双方利益的基础上,采用双层规划模型描述物流配送中心的选址问题。基于进化博弈与多目标优化的思想设计了层次遗传算法来求解该模型,通过两个遗传算法的交互迭代求解物流配送中心选址问题。最后通过算例验证了模型与算法的可行性。     

变路网情况下车辆路径问题建模及应用

受车辆调度中的一类现实需求启发,提出了路网结构可变情况下的车辆路径问题。探讨了路网变动对车辆路径的影响,在描述可变路网的基础上,基于路网、路径双层优化思想,建立了问题优化模型。考虑到路网变化给问题求解带来的复杂性,给出了改进遗传算法与随机递归算法相结合的求解策略。作为模型的直接应用和说明,最后的算例验证了模型和算法的合理性、有效性。     

考虑备灾的双层规划应急资源调度选址—路径优化模型与算法

备灾措施可以为救灾做准备,为确保灾后应急物资可以及时高效地到达灾区,提出了考虑备灾的双层规划应急资源调度选址—路径优化模型,上层规划以供应站建设和运营总成本最低为目标,而下层规划以配送路径成本最小化为目标.设计了一种改进的双层樽海鞘遗传算法求解该问题,结合迭代划分的概念更新领导者位置,采用自然指数惯性权值策略修正控制因子,利用混沌映射更新追随者位置,采用田口分析方法获取参数合理取值.最后,通过使用双层樽海鞘遗传算法与遗传粒子群混合算法、粒子群优化算法、免疫优化算法对OR-Library中的LRP(location-routing problem,LRP)数据集进行求解和对比分析,验证了所提模型和算法的可行性和有效性.     

基于遗传算法的城市混合型路网设计问题研究

针对目前城市路网设计中存在的一些缺陷,提出一种基于遗传算法的城市混合型路网设计的多目标优化模型,它可一次性求得多个可供规划决策者进行选择的路网设计方案,并利用一个算例进行仿真试验,结果表明,该模型和算法是可行的、有效的,可以为城市路网规划提供借鉴。     

动态路网选址–路径优化算法及实现

针对路段通行时间随旅行时段变化的实际城市路网环境下的选址–路径问题, 建立其混合非线性整数规划 模型; 并在双层规划模型的基础上, 利用遗传算法进行设施选址, 改进蚁群算法进行车辆路径优化, 提出一种遗传算 法与改进蚁群算法协同的求解方法(GA–IACO). 在路径优化中, 基于NNC算法生成初始可行解集; 采用Max-Min蚁 群系统策略动态更新信息素范围, 降低陷入局部最优的可能性; 并通过模拟退火过程, 对邻域解集按照Metropolis准 则进行接收, 以增强算法的全局搜索能力. 在测试集上的结果表明了算法在时变有向网络上的可行性, 为验证算法 的有效性, 通过构建杭州市路网的富属性网络模型, 在得到路网结点间OD成本矩阵的基础上进行求解, 实验结果表 明, 配送成本平均降低6.92%, 选址–路径规划总成本平均降低7.09%, 所得结论为实际优化决策提供了理论支持.     

一类非确定性车辆路径问题模型及其算法设计

提出一类路网结构未定、需求随机的非确定性车辆路径问题(N-DVRP),通过分析路网结构变动和需求随机双重不确定性对车辆路径选择的影响,建立N-DVRP的优化模型,并设计求解该问题的动态加速自适应遗传算法.仿真实验结果验证了该问题模型及其求解算法的合理性和有效性.     

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.     

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.     

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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