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1.
刘军  阳小华  杨星 《微型电脑应用》2006,22(4):24-27,30
基于组件技术的软件技术开发模式是实现大规模的代码复用的一条切实可行的途径,是面向对象技术的发展,本文介绍了基于组件的软件复用的基本概念及4种组件技术,着重阐述了B/S模式下的.NET组件开发的一般方法,并在此基础上完成了教学信息发布与管理系统的功能描述、设计与实现。  相似文献   

2.
本体的构造始终是困绕开发者的一个问题,因此开发自动或半自动工具成了本体构造的当务之急.鉴于当前在很多应用领域中存在着大量的概念模式,本文通过对本体与概念模式之间关系的研究,揭示了它们之间存在的内在联系.利用这些联系,我们建立了从概念模式向本体的转换规则,并开发出了一套从概念模式向本体的转换方法,从而实现了域本体的半自动构造.  相似文献   

3.
基于组件技术的软件技术开发模式是实现大规模的代码复用的一条切实可行的途径,是面向对象技术的发展,该文介绍了基于组件的软件复用的基本概念及4种组件技术,着重阐述了B/S模式下的.NET组件开发的一般方法,并在此基础上完成了教学信息发布与管理系统的功能描述、设计与实现。  相似文献   

4.
利用本体簇生成标准概念模式   总被引:5,自引:0,他引:5  
提出了一种标准概念模式的生成方法,为概念模式的复用提供了一种新的方法,其通过引入本体与本体族,对给定概念模式的语义完整性进行评估;然后,对符合完整性要求的概念模式采用量化手段进行处理,从而产生具有代表性的标准概念模式,该方法从语义与结构两个方面对概念模式进行处理,使产生的标准概念模式更具有复用价值。  相似文献   

5.
介绍了基于组件的软件复用的基本概念及四种组件技术,着重阐述了B/S模式下的.NET组件开发的一般方法,并在此基础上完成了教学信息发布与管理系统的功能描述、设计与实现。  相似文献   

6.
对于构造高效可复用的通用软件组件的研究已成为软件工程领域非常有研究价值的工作.软件的分析模式是可复用的组件模型,然而一般的分析模式中都存在一些不足,这些不足使得分析模式很难成为高效可复用的组件模型.本文将提出八个重要分析模式属性来评价模式的可复用性,另外提出一种稳定的分析模式的概念,最后将稳定的分析模式与其他模式进行比较.  相似文献   

7.
领域本体构建方法研究   总被引:2,自引:0,他引:2  
本体为某一领域的人和应用系统之间的交流提供了一种通用的知识共享模式.文章介绍了领域本体的基本概念,探讨了基于领域本体的语义模型的构建原则和生命周期,比较了典型的领域本体开发方法的特点.最后,分析了基于OWL的本体开发方法,并通过一个开发示例说明了本体开发的过程.  相似文献   

8.
基于 P-F方法的软件过程建模的复用性   总被引:6,自引:0,他引:6  
周之英 《软件学报》2001,12(8):1258-1264
P-F方法可以直观而精确地提供软件过程的复用机制.软件过程的复用问题如同软件本身的复用性,具有同样重要的意义.为了抽象过程复用机制,P-F方法使用3层复用结构:过程模板、模式和元模式.过程模板代表由P-F方法描述的部分过程的可复用类.模式是模板的拓扑结构.最底层是元模式,代表最基本的模式,也是建成良结构过程/模板/模式的基本材料.利用元模式来构造软件过程可以避免病态的软件过程,并可以改进软件过程管理.形式化地定义了可复用结构部件间的操作.这些操作帮助实现软件过程的定义、复用或集成.软件过程的可复用特性在许  相似文献   

9.
近年来需求工程模式复用成为需求工程学科研究焦点之一,但目前尚缺乏需求工程模式的描述规范及其复用指导方法.为此提出了一种包括概要视图、规约视图、数据视图,以及知识视图等的模式四视图表示模型FVRPEM,用于从模式的角度抽象和表示需求过程方法或技术;并以此为基础定义了需求过程模式复用准则,进而定义了模式复用框架RPSEA.包含模式选择、评估与确定三个环节.FVRPEM模型与RPSEA复用过程框架为需求过程模式的高层次复用提供了指导,能够为需求过程模型的定义和裁剪提供支持.  相似文献   

10.
随着测试用例复用实践的深入和可复用测试用例库规模的不断扩大,对测试用例表示和高效检索已经成为目前研究的热点.基于本体描述的测试用例,结合基于本体的概念语义相似度计算思想,针对测试用例本体描述的特点,提出了一种基于用例复用行为的匹配度计算方法,并通过理论分析与实验检验证明,其提高了用例检索的查全率及用例复用的效率.  相似文献   

11.
The promises of network-accessible information are increasingly difficult to achieve. These difficulties are due to a variety of causes, such as, the rapid growth in the volume of network-available information and the increasing complexity, diversity and terminological fluctuations of the different information sources available. This paper presents a conceptual architecture for the organization information space across collections of component systems in a multi-database network that provides serendipity, exploration and contextualisation support so that users can achieve logical connections between concepts they are familiar with and schema terms employed in multi-database systems. Large-scale searching for multi-database schema information is guided by a combination of lexical, structural and semantic aspects of schema terms in order to reveal more meaning both about the contents of an information term and about its placement within the distributed information space.  相似文献   

12.
XML已经成为Web上表示结构化和半结构化数据的标准格式,为了描述XML数据的结构和内容,业界已经提出了多个XML模式语言。虽然XML模式对ValidatingXML文档非常有用,但它不适用于要求表示数据有关语义知识的任务,对这样的任务最好使用概念模式。针对XML模式的概念建模,介绍了一种扩展实体关系模型及将用XML模式语言定义的模式转换成扩展实体模式的过程。  相似文献   

13.
本文在分析联邦数据库系统成员异构的特点后,论述了一种基于输入/输出模式和概念模式的转换方法,通过该转换处理可以有效地解决模式异构的问题,这种方法已在SU-FDBS原型中实现。  相似文献   

14.
The typical design process for the relational database model develops the conceptual schema and each of the external schemas separately and independently from each other. This paper proposes a new design methodology that constructs the conceptual schema in such a way that overlappings among external schemas are reflected. If the overlappings of external schemas do not produce transitivity at the conceptual level, then with our design method, the relations in the external schemas can be realized as a join over independent components. Thus, a one-to-one function can be defined for the mapping between tuples in the external schemas to tuples in the conceptual schema. If transitivity is produced, then we show that no such function is possible and a new technique is introduced to handle this special case.  相似文献   

15.
This paper presents concepts and tools for simulation softwares specification. At an abstract level of specification, we define a simulation software as a couple (conceptual structure, abstract machine). The conceptual structure is a structured representation of the simulated system behaviour. The abstract machine is a set of abstract and general mechanisms able to carry out the management of a system defined through its conceptual schema. We focus in the paper on concepts for behaviour structuring and abstract machine tools.  相似文献   

16.
Recent years have witnessed a rise of social publishing, which is a new type of social networking service. Social publishing has certain new features that call for a new way of managing and providing a large volume of documents. A fine data model is expected to evolve dynamically with the up‐to‐date knowledge, especially the associations that emerge in the context of social publishing. This paper first presents a conceptual schema of social publishing, which evolves to combine the association knowledge that reflects hidden associations in the data. A major constraint of concern is cardinality constraint. During the process of enriching a schema, the constraints to be specified should conform to the existing ones. A set of inference rules is presented for modeling with cardinality constraints. The rules are proven to be sound and complete, which helps to derive cardinality constraints from existing ones. The derived cardinality constraints are also proven to be consistent. © 2012 Wiley Periodicals, Inc.  相似文献   

17.
One of the most important challenges that software engineers (designers, developers) still have to face in their everyday work is the evolution of working database systems. As a step for the solution of this problem in this paper we propose MeDEA, which stands for Metamodel-based Database Evolution Architecture. MeDEA is a generic evolution architecture that allows us to maintain the traceability between the different artifacts involved in any database development process. MeDEA is generic in the sense that it is independent of the particular modeling techniques being used. In order to achieve this, a metamodeling approach has been followed for the development of MeDEA. The other basic characteristic of the architecture is the inclusion of a specific component devoted to storing the translation of conceptual schemas to logical ones. This component, which is one of the most noteworthy contributions of our approach, enables any modification (evolution) realized on a conceptual schema to be traced to the corresponding logical schema, without having to regenerate this schema from scratch, and furthermore to be propagated to the physical and extensional levels.  相似文献   

18.
19.
Integration of geographic information has increased in importance because of new possibilities arising from the interconnected world and the increasing availability of geographic information. Ontologies support the creation of conceptual models and help with information integration. In this paper, we propose a way to link the formal representation of semantics (i.e., ontologies) to conceptual schemas describing information stored in databases. The main result is a formal framework that explains a mapping between a spatial ontology and a geographic conceptual schema. The mapping of ontologies to conceptual schemas is made using three different levels of abstraction: formal, domain, and application levels. At the formal level, highly abstract concepts are used to express the schema and the ontologies. At the domain level, the schema is regarded as an instance of a generic data model. At the application level, we focus on the particular case of geographic applications. We also discuss the influence of ontologies in both the traditional and geographic systems development methodologies, with an emphasis on the conceptual design phase.  相似文献   

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