XML存储结构在仿真数据库中的应用研究

为了解决飞行仿真数据库中复杂数据类型的描述及数据库表结构、表数据的的动态更新,实现系统的开放性,在仿真数据库系统中引入了XML存储结构.研究了XML元素数据与关系数据库元素的映射及相互转换,建立了XML存储结构数据模型,从而使用XML语言描述复杂工程数据.并应用XML灵活性、扩展性强的特点,设计开发了数据库表编辑器,讨论了动态数据模型的实现, 提高了数据库的通用性及开放性.应用实践表明,采用XML存储结构适应于各种不同信息的描述,简化了庞大数据库的复杂度,极大地强化了工程数据库中保存信息与处理信息的能力,提高了数据库的可维护性、可扩展性和系统的开放性.     

XML在分布式交互仿真系统数据管理中的应用研究

HLA的提出为解决分布式交互仿真系统中资源的重用和互操作性提供技术支持,而仿真资源逻辑层面上的重用和互操作性问题的解决有赖于规范的数据管理的实现。数据管理的主要工作体现在标准化描述仿真资源、定义通用标准的数据互换格式以及创建建模与仿真资源库系统三个方面,在讨论数据管理工作现状的基础上,提出了基于XML技术的解决方案,对XML技术在数据管理中的应用作了可行性分析,为实际工作的开展提供指导性的观点。     

基于XML的海上雷达对抗仿真想定技术研究

仿真想定在军事仿真系统中具有重要的地位和作用,例如可在雷达对抗仿真系统中为剧情描述和数据操作提供便利。为此研究了雷达对抗仿真想定模型的结构和特点,结合可扩展标记语言（Extensible Markup Language,XML）可进行语言描述和建模的优点,开发了基于XML技术的雷达对抗仿真想定模型文档。最后给出了仿真想定模块在雷达对抗仿真系统中的实现,为该领域的仿真想定开发提供了解决方案。     

基于XML的数据管理

数据库管理系统在大规模数据的管理方面一直占据着主导性的地位.然而,也表现出了一些不足之处.可扩展标记语言(XML)以它所具有的一些独特的优点和功能,在数据(特别是对于分布、异构、半结构化或者非结构化的数据)管理方面,大有用武之地.该文简要回顾了数据管理的发展历史,讨论了XML对关系数据库在半结构化数据的管理上不足的弥补,分析了在分布式交互仿真系统当中采用XML进行数据管理的几个方面,指出基于XML的数据管理是数据管理的一个新的重要发展.     

基于XML的Web文档处理系统

随着网络技术的发展,可扩展标记语言XML得到了极大的进步.与超文本标记语言HTML不同,XML实现了文档数据内容与显示的分离,具有很强的自我描述能力、可扩展性好等特点,从而有利于信息共享和查询,已经被广泛的应用在各个方面,包括定义行业数据标准、数据交换和数据集成.本文在分析XML技术的基础上,采用XML结合Java语言以及流行的数据库系统作为解决方案,设计并实现了一个包括数据查询功能的Web文档处理系统.     

基于RDBMS的XML数据管理技术研究

XML是一种专门为Internet所设计的标记语言,但是它已逐渐成为Internet上数据表示以及数据交换的标准,是一种发展势头良好的新兴数据管理手段.关系数据库管理系统(RDBMS)是一种技术成熟、应用十分广泛的系统.在数据管理上,XML技术和数据库技术各有优势和不足,XML和数据库结合技术成为学术界的研究热点.在对XML和数据库结合技术进行了研究的基础上一个基于RDBMS的XML数据管理的实现框架(XRM)被提出,该框架依据不同的映射策略,解析Schema文件或DTD,生成对应的关系模式,利用RDBMS存储中间件,使用户能透明地通过RDBMS来管理XML数据.该框架充分考虑了结构的灵活性和扩展性.     

基于XML的机载航电系统仿真模型结构化描述

通过分析机载航电系统仿真模型存在的问题,给出了XML数据模型描述的方法和特点,提出了以想定任务需求为仿真建模的驱动数据的方法,基于XML技术设计了想定任务-飞机-机载装备三层描述关系。分别给出了想定任务和航电系统仿真模型的组成、结构化语言描述、有向树模型及XML技术描述的方法,并在此基础上形成规范的系统接口,为系统建模平台的建设提供重要的技术基础。最后,根据有向树和XML技术的特点,以节点和元素为基本单元,设计了XML文件数据访问的操作函数,形成系统建模平台的基础资源,利用设计的XML任务描述文件给出了航电系统仿真应用平台的设计架构。分析表明该方法用于航电系统仿真平台的建设将很大程度上提高仿真模型资源的重用性和共享性。     

地下变电站辅机控制仿真系统的研究

地下变电站辅机系统具有设备类型繁多、控制类型繁杂、关联复杂等问题.为此,采用XML语言对整个仿真系统进行建模,使用分层设计的方式实现人机交互,利用标准数据库进行外部数据接口设计,对各个子系统之间的数据交互进行模块化设计.根据地下变电站辅机系统特点,设计和实现了辅控后台仿真以及日常巡视、操作和事故处理等子系统.应用结果表明,该系统具有较好的可扩展性和可维护性.     

基于XML的潜艇作战仿真想定开发

作战仿真想定是军事仿真系统的重要组成部分,为仿真系统的运行提供了初始态势和作战任务.目前在仿真想定中存在的主要问题是对想定描述的格式和手段不统一,生成的仿真想定可读性和可移植性不好,影响了仿真系统的真实性和可信度.该文着眼于解决上述问题,通过分析潜艇作战想定描述的层次结构,针对XML技术在数据表达方面的特点和应用,探讨了使用XML表示标准的潜艇作战想定开发方法,并对仿真想定编辑系统进行了实现.为潜艇作战仿真系统的剧情开发与编辑提供了标准化的思路.     

SQL Server2005中的XQuery应用研究

XQuery是一种用于从XML文档中获取数据的查询语言,是W3C组织于2007年发布的推荐标准.其在XML格式数据中的作用,类似于标准SQL语言在关系数据库中的作用.XQuery功能强大,得到XML原生数据库以及支持XML的关系数据库的支持.对全面支持XML技术的SOL Server 2005数据库中XQuery语言的实现与应用进行研究,探讨了SQLServer2005中实现XML数据查询的机制及其特点,分析了在SQL Server 2005中XQuery语言的运用,特别讨论了在SQLServer2005中对XQuery标准所做的扩展.即其通过XQuery实现对XML文档中元素的操作,并通过具体示例阐明了SQLServer 2005中XQuery标准及其功能扩展的实现.     

Only connect: teaching, technology and telesis

Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

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.     

Avoiding semantic and temporal gaps in developing software intensive systems

Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.     

Designing economic np control charts: A programmed simulation approach

This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.     

The development of robot art

Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

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.     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

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.