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UML的炮兵指挥信息系统体系结构设计

体系结构设计是炮兵指挥信息研制中的一项重要内容,C4ISR体系结构框架为炮兵指挥信息系统体系结构的设计提供了良好的概念基础.在深入研究UML建模过程的基础上,综合运用体系结构框架、UML等方法,给出了基于UML的炮兵指挥信息系统体系结构设计步骤,并进行了炮兵指挥信息系统体系结构的静态和动态模型的设计,建立了一系列的合理的模型.该方法对炮兵指挥信息系统体系结构设计有着重要的理论意义和应用价值,作为支撑技术在各类指挥信息系统中有着广泛的应用前景.     

以决策为中心的软件体系结构设计方法

提出针对体系结构层次设计的决策抽象和问题分解原则,以及基于该原则的一种以决策为中心的体系结构设计方法.该方法从决策的视角对体系结构进行建模,并通过一个从导出体系结构关键问题到对体系结构方案决策的过程完成设计,还在其中实现了候选体系结构方案的自动合成以及设计决策与理由的捕捉.这种以决策为中心的方法切合体系结构层次的特点,降低了体系结构设计的复杂性和设计决策与理由捕捉的代价.     

一种软件体系结构设计决策的建模工具

体系结构设计在整个软件生命周期中起到关键作用,而设计知识的蒸发会导致系统演化花费代价高、涉众之间交流出现障碍、体系结构制品的复用受到限制等问题,为此需要在软件体系结构层次对设计决策进行显式化的建模.基于一种以决策为中心的体系结构设计方法,实现了一个软件体系结构设计决策的建模工具.该工具帮助架构师对体系结构设计中的问题、方案、决策、理由等核心概念进行建模,完成从需求到体系结构的设计过程,并实现了自动化的候选体系结构方案的合成和部分设计理由的捕捉.该工具还提供了体系结构设计模型与设计决策之间的相互追踪性,以及帮助实现体系结构设计过程中设计决策知识的复用.     

基于SQL Server外挂空间数据库的设计与实现

以SQL Server 2000为后台数据库服务器，设计并实现了GeoView的外挂控制数据库，在空间数据库开发设计过程中采有了面向对象技术方法和C／S体系结构，通过对图形数据的分析，实现了空间数据和属性数据在关系数据库中的统一存储，基于分布式数据库管理系统的GeoView系统，将随之具有多用户特征，完善的RDBMS也为所存储的空间数据和属性数据提供标准化依据。     

基于可执行模型的体系结构验证评估方法

信息系统体系结构设计是系统开发过程中的一个关键环节,正确评估体系结构能够提高系统开发效率.基于可执行模型的体系结构验证评估方法是一种有效的验证体系结构评估方法.分析基于可执行模型的体系结构验证评估的特点,提出该方法的评估过程和评估内容.提出基于对象Petri网的可执行模型构建方法,并通过实例说明该方法的可行性.     

基于SVG的网络数学图形编辑系统设计与实现

针对目前网上数学图形不能被查询和重用的弊端,提出了一种基于SVG的网络数学图形编辑系统的实现方案。该方案采用SVG技术实现,使得数学图形能够以不同于传统交流的方法在Web上处理和传输。文章分析了SVG和Ajax技术的特点,提出了基于SVG的网络数学图形编辑系统的体系结构,设计了一种基于关系数据库管理系统（RDBMS）的SVG存储方法,实现了在线编辑的图形创建、删除、保存、缩放、度量和计算等功能。     

空间科学与探测任务论证仿真系统的设计与实现

分析了空间科学与探测任务论证支持系统(SSDRSS)的功能和仿真需求,实现了可扩展的仿真系统体系结构设计.基于高层体系结构(HLA)的仿真实现采用了灵活的成员接口设计和合理的联邦成员划分,降低了扩展系统和开发新成员的复杂度.将该仿真系统的设计应用于双星科学任务论证中,实现了论证过程和设计结果的分布式仿真和仿真结果的对比分析,验证了设计的可行性.     

支持上下文感知服务的中间件原型*

提出了基于传感器网络环境的上下文感知应用开发中间件原型的体系结构MidCASE,重点阐述了中间件的体系结构设计和软件运行时基于服务的分布式运行架构.讨论了上下文感知过程中的两个关键问题,包括上下文信息建立的方法和感知过程中上下文信息与高层通信的调度模型.最后,以该中间件原型为基础,通过在医疗护理的场景下实现上下文感知应用并证明了其易用性与支撑作用.     

基于SQLSERVER的面向对象数据库的构建

随着计算机技术的日益发展,软件的需求随之日益增大,计算机辅助软件工程(CASE)成为解决软件需求与生产之间矛盾的主要方法。在CASE的实施过程中,OO方法成为主流,但是由于目前的主流数据库都是RDBMS,因此,CASE与DBMS之间的配合成为CASE应用的一个重要瓶颈,该文根据OO方法的特点,阐述了从RDBMS向RODBMS映射的规则,提出了从CASE中的类图向RDBMS表映射的方法,并利用SQLSERVER中提供的存储过程实现了基于Web的机加工仿真环境中的模型库的设计。     

基于Flex+J2EE多层架构的RIA在线考试系统

在线考试是计算机技术在现代教学中的重要应用.选择良好的架构对于在线考试系统开发具有重要的意义.本文提出了基于Flex+J2EE多层架构的RIA在线考试系统的设计方案并详细说明了多层架构的实现方法.将Flex技术与J2EE框架进行整合,使系统既具备了优秀的交互性和用户体验性又获得了良好的稳定性、可维护性和可扩展性.     

Modelling Shared Attention Through Relational Reinforcement Learning

Shared attention is a type of communication very important among human beings. It is sometimes reserved for the more complex form of communication being constituted by a sequence of four steps: mutual gaze, gaze following, imperative pointing and declarative pointing. Some approaches have been proposed in Human?Robot Interaction area to solve part of shared attention process, that is, the most of works proposed try to solve the first two steps. Models based on temporal difference, neural networks, probabilistic and reinforcement learning are methods used in several works. In this article, we are presenting a robotic architecture that provides a robot or agent, the capacity of learning mutual gaze, gaze following and declarative pointing using a robotic head interacting with a caregiver. Three learning methods have been incorporated to this architecture and a comparison of their performance has been done to find the most adequate to be used in real experiment. The learning capabilities of this architecture have been analyzed by observing the robot interacting with the human in a controlled environment. The experimental results show that the robotic head is able to produce appropriate behavior and to learn from sociable interaction.     

A Flexible Ontology Reasoning Architecture for the Semantic Web

Knowledge-based systems in the semantic Web era can make use of the power of the semantic Web languages and technologies, in particular those related to ontologies. Recent research has shown that user-defined data types are very useful for semantic Web and ontology applications. The W3C semantic Web best practices and development working group has set up a task force to address this issue. Very recently, OWL-Eu and OWL-E, two decidable extensions of the W3C standard ontology language OWL DL, have been proposed to support customized data types and customized data type predicates, respectively. In this paper, we propose a flexible reasoning architecture for these two expressive semantic Web ontology languages and describe our prototype implementation of the reasoning architecture, based on the well-known FaCT DL reasoner, which witnesses the two key flexibility features of our proposed architecture: 1) It allows users to define their own data types and data type predicates based on built-in ones and 2) new data type reasoners can be added into the architecture without having to change the concept reasoner     

网格体系结构研究

通过对国内外网格体系结构的深入研究,揭示了网格体系结构的发展历程,使读者对网格体系结构有一个清晰整体的认识。描述了3个最具代表性的网格体系结构,对网格计算的进一步发展有一定的指导意义。     

EJB中用JMS模拟多线程机制的设计和实现

多线程机制是提高系统执行效率的关键，但对于采用EJB技术的服务器端，由于EJB规范限制使用多线程机制，因此执行效率往往不那么令人满意。针对EJB中不能使用线程这一缺陷，文中给出了在EJB中如何用JMS来模拟多线程机制并提供了一个具体的实现方案，将该方案用于网管系统中并发的获取各网络设备的MIB信息以计算某一网络性能指标时取得了令人满意的成绩，大大缩短了系统运行的时间。从而可知在EJB中采用JMS技术来模拟多线程机制不仅在理论上可行，在实际应用中也是可行的。     

A multi-agent architecture for outsourcing SMEs manufacturing supply chain

In the present, global and competitive market customer's demands are very volatile. It is very difficult for small and medium size enterprises (SMEs) to satisfy their customer with quality product in reasonable price. Large firms are spending huge amount of their budget in generating technology development. To cope with this competitive market, usually, SMEs concentrate on their core expertise and outsource some non-core items or activities. The outsourcing decision (when, what, whom) is very crucial for small-scale industries. Realizing this scenario, in this article, an automated self-adaptive multi-agent system has been proposed. The proposed system will help SMEs to take an appropriate decision to mitigate the uncertainty in supply chain. The developed system exploits the “Outsourcing of operations” feature by its agents to conclude the manufacturing processes faster and reduce the idle time of certain machines with less human intervention. The communication protocol for agents has been described to give an insight of their communication. It was explained how various agents like outsourcing, material planning and supplier selection will come into action at different stages and take appropriate outsourcing decisions. Therefore, this multi-agent architecture will facilitate small scale manufacturing industries to execute their manufacturing processes and complex logistics issues efficiently. The execution of proposed architecture has been described in the simulated case study.     

Evaluating perceived voice quality on packet networks using different random neural network architectures

Voice over Internet Protocol (VoIP) is one of the fastest growing technologies in the world. In VoIP speech signals are transmitted over the same network used for data communications. The internet is not a robust network and is subjected to delay, jitter, and packet loss. It is very important to measure and monitor the quality of service (QoS) the users experience in VoIP networks; this is not an easy task and usually requires subjective tests. In this paper we have analyzed three non-intrusive models to measure and monitor voice quality using Random Neural Networks (RNN). A RNN is an open queuing network with positive and negative signals. We have assessed the voice quality based on various parameters i.e. delay, jitter, packet loss, and codec. In our approach we have used the Mean Opinion Score (MOS) calculated using a Perceptual Evaluation of Speech Quality (PESQ) algorithm to generate data for training the RNN model. We have studied two feed-forward models and a recurrent architecture. We have found that the simple feed-forward architecture has produced the most accurate results compared to the other two architectures.     

基于IP组播的煤矿监测实时信息发布系统

煤矿生产过程中安全监测监控实时信息的发布对于煤矿安全是一个非常重要的问题。介绍了基于IP组播的煤矿监测实时信息发布系统的设计思想和系统构成,并设计实现了基于B／S模式的煤矿安全监测实时信息的在线发布,使该系统具有良好的可扩展性和实用性,取得了良好的效果。     

Embedding hierarchical hypercube networks into the hypercube

The embedding of one interconnection network into another is a very important issue in the design and analysis of parallel algorithms. Through such embeddings, the algorithms originally developed for one architecture can be directly mapped to another architecture. This paper describes a new embedding method, based on matrix transformations, for optimally embedding hierarchical hypercube networks (HHNs) into the hypercube (binary n-cube). Thus, this embedding method has practical importance in enhancing the capabilities and extending the usefulness of the hypercube, since hierarchical hypercube networks have proven to be very cost-effective for a wide range of applications     

基于XML和移动代理的企业资源信息集成方法研究

企业资源信息的集成是实现制造业信息化工程的一项重要内容,资源信息的表达和共享是实现敏捷制造、异地制造时应解决的关键问题。通过对已有集成方法的分析,找出其在资源信息集成中存在的问题。提出了基于XML和移动代理技术的资源信息集成的新方法。在分析其体系结构的基础上,对实现集成的技术方法进行了探索,并将其应用于工程实际中。