集装箱装载的一种启发式算法

多约束条件下的三维装箱问题是一个复杂的组合优化问题,属于NP-HARD问题，其求解是很 困难的．所以在实际应用中,往往采用一些启发式算法来求解．本文在考虑一些实际应用中 的约束条件下，提出了一种三维集装箱装载的启发式算法．此算法采用了三空间分割、平均 高度装载、货物合并、空间合并等策略，考虑了方向、重量、优先顺序、货物的配置位置等 约束条件．通过逐步淘汰差的装载方案，最后达到满意的装载．实例仿真说明了该算法的有 效性和实用性，能够直接用于实际应用中．     

蚁群算法求解复杂集装箱装载问题

针对复杂集装箱装载问题(CLP),应用启发式信息与蚁群算法求解了最优装载方案。首先,建立了复杂集装箱装载问题的数学模型,利用蚁群算法对解空间的强搜索能力、潜在并行性及可扩充性,结合三空间分解策略将布局空间依次分割;然后,装入满足约束条件的最优货物块,完成不同大小三维矩形货物的装载布局。在此基础上,设计了基于空间划分策略的蚁群算法。最后以700件货物装入40尺(12.025m)高柜箱进行计算,结果表明该方法能提高集装箱的空间利用率,同时兼顾了多个装载约束条件,可应用性好。     

基于装箱树算法求解集装箱装载问题的研究

研究了把同种货物装入一个集装箱内，使箱子内的空间利用率为最大的集装箱装载问题．首先，运用启发式算法,充分考虑了箱子和货物的方位、剩余空间等问题．然后，通过主空间装填、空间分层、剩余空间优化等建立一个装箱树．最后，用Java程序完成装箱树算法，并实现集装箱装载问题的求解．用实例验证了算法的可行性，能够投入实际应用．     

混合二元蚁群算法求解集装箱装载问题

集装箱装载问题是一个具有复杂约束条件的组合优化问题,属于NP-hard问题。针对集装箱装载问题的特点,设计了空间三叉树,对可利用空间采用三叉树划分策略,利用二元蚁群算法结合启发式算法进行求解,即先利用二元蚁群算法确定预备装入货物集,再用启发式算法决定货物的装入优先级顺序,并给出了有效的装箱算法。实例结果表明该算法的有效性和实用性。     

集装箱装入问题的研究

集装箱装载问题是一种有广泛应用背景的组合优化问题,它属于NP-hard问题。禁忌搜索算法(TS)是求解组合问题的一种主要方法,有很强的全局搜索能力。集装箱装入属于有多种约束的空间资源优化问题。约束条件多,求解困难。根据同类型货物一次性装载的思想,提出了一种新的基于空间划分的启发式算法。     

遗传模拟退火算法在弹药装载中的应用研究

多约束条件下的弹药装载问题是一个复杂的组合优化问题，属于NP-完全问题，其求解是很困难的。本文在考虑弹药装载中各类约束条件的情况下，将模拟退火算法作了若干改进后，融入遗传算法，提出了一种遗传模拟退火算法来求解弹药装载问题。本文对该算法的遗传算子和冷却进度表进行了详细的阐述，给出了使用该算法求解弹药装载问题的具体实现方法。     

三维装箱问题的遗传算法研究

本文以集装箱自动装载系统为例,根据货物放置方向、装载容积等约束条件,给出了有效的解码算法,提出了一种改进遗传算法,并通过实例数据进行了实验结果分析。     

基于混合遗传算法的多约束集装箱装载问题研究

在考虑集装箱装载货物底置等级、侧放方式、堆码层数等一些实际应用的约束条件下,根据同类型货物一次性装载的思想,提出了一种新的基于空间划分的启发式算法,并以此为基础构造了一种混合遗传算法。     

同类货物集装箱装载问题的启发式算法

提出了求解同类货物集装箱装载问题的一种启发式算法.算法中采用了层的思想,集装箱的每个面都可用来构建层.通过对二维布局、层高组合和用来构建层的集装箱面的选择等三个方面的优化求解,得到了具有较高装载率的集装箱装载方案.实例结果表明,该算法是求解同类货物集装箱装载问题的一种行之有效的方法.     

改进型文化算法在三维空间装载中的应用

为提高仓储货运空间利用率,降低成本,提高效率,提出基于改进型文化算法的三维空间最优装载方法。根据装载问题的特点,兼顾各项约束条件建立起一个多约束多目标的数学模型,并且将文化算法单一的信仰空间改进为多层。该算法通过对多层信仰空间择优选取,用其中的经验来提高进化速度和计算性能,同时保持搜索范围广等优良性。仿真结果表明:该算法有良好的结果,与传统算法相比,能够更有效快速地解决三维集装箱装载问题,可应用性好。     

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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