航空公司航班延误预警管理模型与分析

目前国内对航班延误状态的描述方法很多,缺乏统一的计算模型,对航班延误结果的评价也比较模糊.以航空公司的航班延误管理为研究目标,采用层次分析方法(AHP).提出了以航班延误率、平均延误时间及延误损失为评价指标的航班延误状态描述方法,运用马尔可夫(Markov)链对评价指标进行预测,通过仿真实验与结果分析,给出了航班延误预警管理的计算模型,为航空公司实施可控因素的航班延误的预警管理提供了理论与方法支持.     

一种面向航班准点率保障的航班协同调度评价模型

为了保障航班的准点率,对航班调度过程中空管、航空公司和机场之间的协同状况进行评价,构建一种面向航班准点率保障的航班协同调度评价模型。基于某一时间段内机场航班进港时间平均偏离值、出港时间平均偏离值、保障完成时间平均偏离值、目标撤轮挡时间准确率和计算起飞时间准确率,建立航班协同调度的指标体系;采用关联规则挖掘的方法确定各指标对航班协同调度及航班延误影响的阈值;结合模糊层次分析法和综合评价法,对各单位在航班调度过程中的协同状况给出量级评价。实验表明:该模型能够科学有效地评价各单位在航班调度过程中的协同状况,对于优化航班保障、提高航班放行正常率具有重要意义。     

基于模糊层次分析法的网络节点安全评价研究

为提升网络节点安全态势评价的效果,提出基于模糊层次分析法的网络节点安全评价方法。首先,建立模糊层次分析模型,运用标度法构造判断矩阵进行量化分析;其次,建立评价模型,根据决策准测对判断结果进行赋值;最后,运用模糊层次分析法(Fuzzy Analytic Hierarchy Process,FAHP)计算隶属度向量的单因素,根据条件因素设定阈值。实验结果表明,所设计方法的评价结果在300～320,可实时评估节点攻击态势。     

基于FAHP-IE算法的尾矿库安全性三级评估研究及应用

从系统安全工程学的观点出发,针对尾矿库事故发生的随机性与不确定性特点,结合模糊层次分析法(Fuzzy Analytic Hierarchy Process,FAHP)和信息熵(Information Entropy,IE)建立尾矿库安全性三级综合评价模型。为解决专家评价分析过程中主观不确定性难以量化的问题,利用信息熵方法对FAHP确定的尾矿库安全评价指标权重进行优化,进而建立面向分层指标体系的尾矿库多主体安全评价模型。根据建立的尾矿库安全性综合评价模型,能够计算尾矿库安全综合评价指数,对于具体的尾矿库工程进行评价后分类定级,从而找出尾矿库存在的安全隐患。案例分析表明,FAHP-IE方法计算简便,用于系统安全状态评价不仅具有模糊综合法的特性,而且兼顾了评价主体认知歧异引起的不确定性,信息利用率高、评价结果可靠,可以为现场整改提供量化依据。     

基于模糊层次分析法的煤矿安全生产预警系统

针对煤矿安全生产预警评价指标多,且各指标受很多因素影响的问题,构建了基于模糊层次分析法的煤矿安全生产预警系统。该系统将层次分析法与模糊综合评判相结合,利用层次分析法确定各评价指标的权重,通过模糊评判矩阵进行模糊综合评判,最后将评价指标权重与模糊综合评判结果进行合成运算,从而确定煤矿安全等级和预警结果。实际应用结果验证了该系统的可行性和有效性。     

基于IGAHP-熵-博弈论-Choquet积分的新型装甲装备通用质量特性评价模型研究

为实现新型装甲装备通用质量特性评价,在建立评价指标体系的基础上,结合新型装甲装备特点,明确了通用质量特性对评价的要求,运用改进群体层次分析法(Improved Group Analytic Hierarchy Process,IGAHP)确定了指标的主观权重,采用熵权法明确了指标的客观权重,并引入博弈论的思想融合了主客观权重,考虑到评价准则之间的关联性问题,引入了模糊测度的概念,运用Choquet积分实现了指标评价值聚合,构建了新型装甲装备通用质量特性评价模型,为新型装甲装备通用质量特性的改进研究奠定了基础。     

基于三角模糊数层次分析法与网络仿真的网络整体性能评价研究

结合模糊理论提出了改进的模糊AHP算法——基于三角模糊数层次分析法(Triangular Fuzzy Number Analytic Hierarchy Process,TFAHP),使得结论更加客观、合理,同时简化了AHP算法的步骤。在提出基于THAHP网络整体性能评价模型的基础上,阐述了应用网络仿真技术进行网络整体性能评价的方法。包括性能指标选取、仿真试验设计、仿真性能参数计算和仿真结果处理与分析的方法,并给出了对一个具体的多媒体网络进行网络整体性能评价的应用实例。     

层次分析法及其建模过程

层次分析法（Analytic Hierarchy Process,简称AHP）是对一些较为模糊、较为复杂的问题作出决策的简易方法,它特别适用于那些难于完全定量分析的问题。本文主要介绍了层次分析法及其建模过程,详细介绍了如何使用层次分析法进行问题分析。     

一种基于ANP的卷包设备健康状态模糊综合评价方法

鉴于卷包设备健康状态的模糊性,文章提出了一种结合层次网络分析法(ANP)与模糊C均值聚类法(FCM)评价卷包设备健康状态的模糊综合评价方法.该方法利用ANP来确定各评价指标的权重,利用FCM计算各评价指标的隶属度,并合成计算得到最终的评价结果.最后,实例分析验证了评价方法的有效性.     

企业铁路调车计划的AHP模糊综合评价

针对目前企业铁路调车计划的评估仍不够完善的现状,建立了AHP（层次分析法）与模糊综合评价相结合的调车计划评价方法.利用层次分析法确定了调车计划各评价指标的权重,采用模糊综合评价的方法对评价信息进行分析处理,最后得到评价结果,验证了层次分析法和模糊综合评价相结合进行调车计划评价的合理性与可靠性.     

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)

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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