LonWorks电梯群控系统仿真平台的设计

为了提高电梯群的运行效率和服务质量,需要采用电梯群控系统来协调各电梯的运行,电梯群控系统的核心问题是电梯群控算法及其性能的测试.采用分布式设计思想,设计了一种基于LonWorks的电梯群控系统仿真平台,可以将不同的电梯群控算法程序下载到该仿真平台上测试,能比较出群控算法的性能和效率.结果表明,所设计的仿真平台能够测试电梯群控算法的优劣,是一种经济、实用、有效的实验平台.     

电梯群控系统仿真平台的设计与应用

电梯群控算法是电梯群控系统的核心部分,为了测试各种群控算法的性能,本文提出了一种基于Delphi和Matlab的电梯群控系统仿真平台的设计方法.Delphi是新一代面向对象、可视化的编程环境,而Matlab具有强大的数值计算和图形处理能力,把二者结合起来,利用DDE技术实现二者的动态数据交换.该仿真平台能够产生交通流,并根据交通流进行模式识别,模拟实际梯群的运行,并对梯群进行仿真调度,分析仿真结果.它为测试电梯群控算法、仿真电梯运行过程、进行电梯配置等工作提供了一个方便的试验平台,是研究电梯群控系统必不可少的有力工具.     

基于模糊BP神经网络的电梯群控系统的仿真

传统的电梯控制方法很难提高电梯控制系统的性能问题.根据电梯群控系统的特性及模糊网络理论和电梯群控系统控制目标的多样性及电梯系统本身所固有的随机性和非线性,为提高电梯运行性能,构建了电梯群控的模型.设计了多个模糊网络高斯隶属函数,实现了乘梯满意度函数、候梯满意度函数、能耗满意度函数在MATLAB上进行仿真,采用了最优函数对电梯群进行控制,通过系统验证了模糊网络的电梯群控的运行效果,达到了改善电梯服务质量、提高电梯运行效能.     

基于模糊控制的半数字键盘电梯群控系统

电梯群控系统的结构决定着电梯交通信息的完善性。信息的非完整性妨碍了电梯群控调度算法的实施。而全数字键盘虽然可以对电梯实施更好的调度，但是硬件的安装增加了电梯系统的成本。文中介绍了一种经济型的半数字键盘的电梯群控模型，能够降低成本和获取必要的客流信息。基于乘客两种不同需求的考虑，推导了乘客的最长候梯时间和最大冲击数的估算公式，采用基于模糊控制的电梯群控策略，符合人们对电梯服务水平的语言级评价。文中仿真试验在采用的半数字电梯群控系统和常规电梯群控系统、全数字群控系统之间做了比较。结果表明，该群控模型表现出较好的性能，乘客的乘梯时间和服务时间有所降低，是一种经济实用的群控模型。     

电梯群控系统的最优调度仿真

在电梯群控节能优化问题的研究中,电梯群控调度是一个开放、动态、复杂系统的多目标优化问题。但是目前大多数群控系统都采用了乘客最少候梯时间的原则来派梯,并没有从电梯的能源消耗等综合因素来调度电梯,从而降低了电梯群控系统的调度性能。并且传统的调度方法在全局收敛性上不能得到很好的满足。为此提出一种蚁群算法的电梯群控系统来进行最佳电梯调度,利用乘客的候梯时间、电梯耗能和电梯拥挤度作为算法的变量数据,并且建立多目标评价函数的蚁群优化模型的控制器,通过蚁群算法进行仿真,验证了蚁群算法对电梯群控得到良好效果,并解决了电梯群控制器对电梯调度单一和全局快速收敛性的问题,为提高电梯群控调度性能提供了参考。     

智能多模式电梯群控调度方法的研究与实现

电梯群控系统的任务是有效地运送乘客，提高电梯运行效率、改善服务质量．根据 大楼不同交通流状况识别不同的交通流模式，并采用最合适的调度方法分派电梯是提高电梯 群控性能的关键．本文实现了一种基于模式识别的智能多模式电梯群控调度方法，该方法可 以在一天中根据不同的交通流状况，提供不同的群控策略,从而使电梯服务更优．仿真实验 表明了这种电梯调度方法是有效的．     

智能多模式电梯群控调度方法的研究与实现

电梯群控系统的任务是有效地运送乘客，提高电梯运行效率，改善服务质量，根据大楼不同交通流状况识别不同的交通流模式，并采用最合适的调度方法分派电梯是提高群控性能的关键，实现了一种基于模式识别的智能多模式电梯群控调度方法，该方法可以在一天中根据不同的交通流状况，提供不同的群控策略，从而使电梯服务更优，仿真实验表明了这种电梯调度方法是有效的。     

面向对象的电梯系统仿真

该电梯仿真系统采用面向对象的思想和基于进程交互的数字仿真技术,利用Delphi作为开发平台,结合经典的电梯群控算法,实现了电梯系统的仿真.同时,系统良好的交互性真实的模拟了乘客乘梯的各个步骤,实现了电梯运行的动态图形化显示和数据统计,为调度算法和电梯的运行机制的选择、评估提供了良好的仿真平台.文章重点介绍了面向对象的模块化设计方法,构造了基于电梯独立运行线程的群控系统模型.模型结构简单,运行效果良好.仿真程序采用面向对象的编程方法实现,提高了软件的重用性和模型的可扩展性,建模方法具有一定通用性.     

基于现场总线的电梯群控模型及其算法

分析了几类现场总线和电梯群控的特点，提出一种基于Profibus现场总线的电梯群控模型和一系列易于在现场总线上实现电梯群控的算法。在搭建的电梯群控模型上实现了并行控制和多目标规划电梯群控算法。同时预测未来现场总线技术和现代控制方法的一个巧妙的结合方法：在线运行，离线学习。从实现的电梯群控效果和模糊神经网络算法仿真的效果来看，多目标规划算法是一个不错的电梯群控算法，但是相对于模糊群控算法来说略有不如。因此，这种在线运行，离线学习的策略将来一定能够在可靠的现场总线控制网络和运算能力相对较强的PC机之间找到一个很好的控制策略。     

分布式电梯群控系统多目标调度算法

基于多代理系统(MAS)的分布式电梯群控系统将电梯及群控器映射为具有不同功能的代理(agent), 呼梯信号的分派通过各agent协商解决, 使梯群调度算法的计算工作量分散到各agent. 基于拟市场模型, 分布式群控算法主要包括较厢代理(C-agent)报价算法及呼梯信号代理(HC-agent)电梯分派算法等. 设计实现了旨在同时降低平均候梯时间、平均乘梯时间及长候梯率的多目标分布式群控算法DMO. 仿真结果表明, 基于MAS的分布式电梯群控系统是可行的, 所设计的分布式群控算法能够使平均候梯时间、平均乘梯时间及长候梯率同时得到优化.     

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.     

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.     

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~~