引入软件设计模式的面向对象程序设计教学方法

针对本科面向对象程序设计语言教学中存在的主要问题,在分析软件设计模式的面向对象特性灵活体现和应用的基础上,提出把软件设计模式引入面向对象程序设计教学的观点,并分析引入软件设计模式的教学方法。结合Java程序设计语言的教学实际,在理论和实践教学中取得了提高学生面向对象程序设计能力的教学效果。     

基于ASP．NET的观察者模式应用研究

观察者(Observer)模式是面向对象程序设计中常用的模式之一.介绍了观察者模式的相关概念,分析了观察者模型中目标和观察者之间的依赖关系.提出了ASP.NET下旨在简化设计、降低耦合的观察者模式实现方案,并结合一个电子商务实例进行了阐述.     

以竞赛培养模式推动理工科程序设计课程改革

提高理工科程序设计课程教学质量是当前需要重点关注的问题。本文在分析当前程序设计课程存在的问题的基础上,阐述了以大学生程序设计竞赛的培养模式推动程序设计课程改革的观点,同时结合本校学生程序设计能力和创新能力培养的实际,介绍了对程序设计课程的教学思路、教学内容、教学方法、实践方式所进行的改革。     

程序设计系统化思维培养模式的探讨

程序设计系统化思维模式培养是程序设计课程的内在要求,也是理工科大学生综合素质培养的要求。本文根据软件工程的思想,提出了程序设计系统化思维的培养模式,从学生学习方法,教师教学方法的角度提出了程序设计系统化思维的培养方法。并通过教学实践,说明该方法是行之有效的。     

适配器模式及其应用

本文先介绍了设计模式的概念,重要性。然后通过实例讲述如何在Delphi程序设计中应用适配器模式来提高应用程序的可维护性。     

基于Win32平台上的PVM并行程序设计

着重介绍了在PVM平台上进行并行程序设计的方法，包括如何构造基于Win32平台上的PVM运行环境，进行任务和数据划分，并提出了一个Master／Slave结构的并行程序设计模式；最后给出一个并行计算在物探处理应用的例子。来对并行程序的设计方法进行概括性的说明。     

Linux下基于SPMD的排序算法及实现

本文介绍了并行程序设计SPMD模式的概念及其两个分类：主从模式和无主机模式,并以排序算法为例,详细阐述了如何在Linux操作系统并行环境PVM下综合利用这两个模式的编程实现,并介绍了此算法在Linux其他两种环境下(MPI环境和直接在Linux下直接编程)的实现方法。     

一种策略模式的AOP实现及应用

基于面向方面编程（AOP）实现GoF设计模式是目前程序设计方法学的一个研究热点。针对GoF设计模式中的策略模式的传统面向对象实现方法所存在的问题,设计了一种基于AOP的实现方法,并应用到J2EE＂应用服务＂核心模式的实例中。分析结果表明,该方法能有效解决策略模式的传统面向对象实现方法中的混乱、间接影响、封装破坏等问题。     

模式在程序设计教学中的应用

基于模式的程序设计教学方法是有益的尝试。本文分析客观存在于程序设计教学中的模式,并以算法实现级模式、程序构建级模式为例,探讨模式在程序设计教学中的应用,从思维工具、知识关联、教学效用三个方面总结这种教学新思维对于提高教学效率的作用。     

单件模式在.NET中的应用实践

针对．NET程序设计中常见的几种应用单件模式的实践情境。分别给出了解决方法。     

Tuning the ensemble selection process of schema matchers

Schema matching is the task of providing correspondences between concepts describing the meaning of data in various heterogeneous, distributed data sources. It is recognized to be one of the basic operations required by the process of data and schema integration and its outcome serves in many tasks such as targeted content delivery and view integration. Schema matching research has been going on for more than 25 years now. An interesting research topic, that was largely left untouched involves the automatic selection of schema matchers to an ensemble, a set of schema matchers. To the best of our knowledge, none of the existing algorithmic solutions offer such a selection feature. In this paper we provide a thorough investigation of this research topic. We introduce a new heuristic, Schema Matcher Boosting (SMB). We show that SMB has the ability to choose among schema matchers and to tune their importance. As such, SMB introduces a new promise for schema matcher designers. Instead of trying to design a perfect schema matcher, a designer can instead focus on finding better than random schema matchers. For the effective utilization of SMB, we propose a complementary approach to the design of new schema matchers. We separate schema matchers into first-line and second-line matchers. First-line schema matchers were designed by-and-large as applications of existing works in other areas (e.g., machine learning and information retrieval) to schemata. Second-line schema matchers operate on the outcome of other schema matchers to improve their original outcome. SMB selects matcher pairs, where each pair contains a first-line matcher and a second-line matcher. We run a thorough set of experiments to analyze SMB ability to effectively choose schema matchers and show that SMB performs better than other, state-of-the-art ensemble matchers.     

CIMS信息集成平台中的OO视图模型

为了满足ＣＩＭＳ环境中信息集成的要求,本文为信息集成平台设计了一种具有集成功能的面向对象视图模型Ｉ－ＶＩＥＷ．Ｉ－ＶＩＥＷ对ＯＯ模型进行了扩充,定义了虚属性、虚对象的概念;引入了输入与隐藏机制和类派生机制,允许对对象的状态和行为进行提炼,能够很好地解决各类集成问题,如模式映射、评义冲突和模式合并与重构等。     

Cost-benefit analysis of data warehouse design methodologies

Methodologies for data warehouse design are increasing more and more in last years, and each of them proposes a different point of view. Among all the methodologies present in literature, the promising ones are the hybrid methodologies—because they represent the only way to ensure a multidimensional schema to be both consistent with data sources and adherent to user business goals—and those able to support the designer by providing some kind of automation. However, the results obtainable by the methodologies can differ substantially in terms of schema quality and required efforts. In this paper, we provide metrics for evaluating the quality of multidimensional schemata in reference to the effort spent in the design process and the automation degree of the methodology. As a case study, we apply our evaluation to the major emerging hybrid methodologies for data warehouse schema design.     

基于数组的数据库外模式/模式映像及应用

以工资管理系统为例，介绍利用数组技术构建数据的外模式/模式映象，它不仅为通用工资管理程序的设计提供了一个可行的方法，同时也为其它数据库应用程序的通用性设计提供了一种新的思路。     

不确定模式匹配研究综述

模式匹配是数据集成、语义Web等研究领域的重要研究内容,需要依据一定的启发式信息发现模式元素之间的对应关系。鉴于启发式信息处理方法的不同,对模式匹配方法进行了分类,并从模式匹配结果集结方法的角度,介绍了综合模式匹配方法。不确定性是模式匹配过程固有的特性,介绍了建模模式匹配过程中不确定性的数据模型,在此基础上介绍了处理模式匹配过程中不确定性的模式匹配方法。最后对模式匹配研究进行了展望。     

用UML设计XML文档模式

XML是新一代的置标语言,它定义了一种描述数据、交换数据的标准。W3CXMLSchema是定义和描述XML文档结构的模式语言。UML是一种得到广泛应用的标准对象建模语言。文章以B2C中的电子定单为例,描述了用UML设计XML文档模式的方法。     

扩展P-Schema及其在XML Schema到关系模式映射中的应用

鉴于P-Schema在XML Schema到关系模式映射中的局限性,对P-Schema进行了扩展,并提出了一种基于扩展P-Schema的XML模式到关系模式的映射方法,对映射中的一些难点问题,如多值元素映射,递归元素映射,关键字、唯一性约束映射等重要问题提出了解决方法。     

Weaving temporal and reliability aspects into a schema tapestry

In aspect-oriented programming (AOP) a cross-cutting concern is implemented in an aspect. An aspect weaver blends code from the aspect into a program’s code at programmer-specified cut points, yielding an aspect-enhanced program. In this paper, we apply some of the concepts from the AOP paradigm to data. Like code, data also has cross-cutting concerns such as versioning, security, privacy, and reliability. We propose modeling a cross-cutting data concern as a schema aspect. A schema aspect describes the structure of the metadata in the cross-cutting concern, identifies the types of data elements that can be wrapped with metadata, i.e., the cut points, and provides some simple constraints on the use of the metadata. Several schema aspects can be applied to a single data collection, though in this paper we focus on just two aspects: a reliability aspect and a temporal aspect. We show how to weave the schema for these two aspects together with the schema for the data into a single, unified schema that we call a schema tapestry. The tapestry guides the construction, interpretation, and validation of an aspect-enhanced data collection.     

Global extensional assertions and local integrity constraints in federated schemata

Integrated access to multiple data sources requires a homogeneous interface provided by a federated schema. Such a federated schema should correctly reflect the semantics of the component schemata of which it is composed. Since the semantics of a database schema is also determined by a set of semantic integrity constraints, a correct schema integration has to deal with integrity constraints existing in the different component schemata. Traditionally, most schema integration approaches solely concentrate on the structural integration of given database schemata. Local integrity constraints are often simply neglected. Their relationship to global extensional assertions, which form the basic integration constraints, are even ignored completely. In this paper, we discuss the impact of global extensional assertions and local integrity constraints on federated schemata. In particular, we point out the correspondence between local integrity constraints and global extensional assertions. The knowledge about the correspondences between the given integrity constraints and extensional assertions can then be utilized for an augmented schema integration process.     

异构数据源集成中的模式映射技术

模式映射是异构数据源集成中实现查询重形成（Reformulation）的关键技术，本文首先介绍了模式映射的集中式和非集中式集成体系，总结了定义模式映射的3种基本形式：GAV、LAV和GLAV，重点探讨了模式映射中的核心技术：模式匹配和映射生成，最后讨论了模式映射技术新的研究议题。