一个支持OO协同式设计的CASE工具

这篇文件介绍一个计算机辅助协同面向对象设计系统的设计与实现技术。文中所述的系统全面支持ＯＯＤ辅助设计,它实现了对象式系统中的要素表示及可视化设计,并支持多用户的协同开发。     

Supporting ontology adaptation and versioning based on a graph of relevance

Ontologies recently have become a topic of interest in computer science since they are seen as a semantic support to explicit and enrich data-models as well as to ensure interoperability of data. Moreover, supporting ontology adaptation becomes essential and extremely important, mainly when using ontologies in changing environments. An important issue when dealing with ontology adaptation is the management of several versions. Ontology versioning is a complex and multifaceted problem as it should take into account change management, versions storage and access, consistency issues, etc. The purpose of this paper is to propose an approach and tool for ontology adaptation and versioning. A series of techniques are proposed to ‘safely’ evolve a given ontology and produce a new consistent version. The ontology versions are ordered in a graph according to their relevance. The relevance is computed based on four criteria: conceptualisation, usage frequency, abstraction and completeness. The techniques to carry out the versioning process are implemented in the Consistology tool, which has been developed to assist users in expressing adaptation requirements and managing ontology versions.     

PLM系统中业务对象版本操作合规性检查的自动实现

分析了企业实施产品全生命周期管理系统时对业务过程中产品的版本操作与产品版本操作生命周期一致性的要求,介绍了版本操作合规性问题,并从语法合规性规则和行为合规性规则两方面进一步阐述了相应的解决方案,详细介绍了版本操作合规性检查方案的实现框架。采用问卷调查研究方法,收集问卷反馈信息,进一步验证了所研究问题在产品全生命周期管理领域的现实性,所提出的解决方案具有可行性,所开发的工具具有很强的应用推广价值。     

基于高分辨率RS影像的城市大比例尺GEO-DB

传统控制测量方法在成图周期、数据存储和后续利用等方面难以满足城市大比例尺制图的要求。该文将高空间分辨率卫星遥感影像借助数据库技术用于城市大比例尺制图来提高制图效率。探讨了研究制图比例尺与遥感影像分辨率的关系,遥感影像处理方法,基于定制规则、自动化符号方案和自动拓扑的遥感图像自动采集方法,空间数据库构建技术,不同格式数据的统一存储、管理和利用,利用版本技术构建和管理时空地理数据库。     

Living with Database Conflicts: A Temporal Branching Technique

Heterogeneous as well as distributed databases make data conflicts inevitable. Both tolerate the entry of conflicting values in data objects, e.g., the value “female” may be entered by one user whereas another may put “male” in the same data object. Such inconsistencies in databases are common and are resolved routinely by built in structured mechanisms. Unresolved conflicts are typically quarantined till they can be resolved. But, there are situations for which there are no structured mechanisms to resolve conflicts while having to maintain application flow. Moreover, there are situations, i.e., medical or financial environments, in which conflicts must be stored so that their effects be analyzed for decision making. The current research proposes a model and a technique for living with database conflicts. The technique, named Temporal Branching, integrates and extends temporal oriented databases, temporal versioning, and log-file approaches and offers a solution and flexible structure readily accessible to retrieval and audits by standard DBMS software. A case study in health care delivery system is given to illustrate the problem and proposed solution. recommend Ahmed Elmagarmid     

面向恶意软件分析及保护的文件系统

为应对危害日益严重的恶意软件,提出在文件系统层对恶意软件进行分析和防御,并尽可能减少其影响的方法,设计实现了面向恶意软件分析和保护的文件系统(MAPFS). 该系统通过文件版本化技术和钩子技术,可记录1个进程在其生命过程中对文件系统的一系列修改. 这些行为记录可作为分析恶意软件的重要依据,也可用于对被破坏的重要文件进行恢复保护. 实验结果表明,该方法可有效用于恶意软件的分析及保护,MAPFS在性能方面的影响低于10％.     

Code and its image: the functions of text and visualisation in a code-based design studio

Abstract

Traditionally, design learning in the architecture studio has taken place through a combination of individual work and joint projects. The introduction of code-based design practices in the design studio has altered this balance, introducing new models of joint authorship and new ways for individuals to contribute to co-authored projects. This paper presents a case study describing four design studios in a higher education setting that used code as a tool for generating architectural geometry. The format of the studios encouraged the students to reflect critically on their role as authors and to creatively address the multiple opportunities for shared authorship available with code-based production. The research question addressed in this study involved the role of code-based practices in altering the model of architectural education in the design studio, in particular the role of visual representations of a code-based design process in the production of shared knowledge.     

Configurable three-way model merging

Software development is a collaborative activity that requires teams of software engineers to cooperate and work in parallel on versions of models. However, model management techniques such as model differencing, merging, and versioning have turned out to be difficult challenges, due to the complexity of operations and graph-like nature of models. Therefore, a well-developed support for model merging process, as well as conflict management, is highly desired. This paper presents a novel process for model merging, called the Epsilon-based Three-way Merging Process (E3MP) process. Model merging is a significant problem where there are different versions of a system model amongst modeler teams. E3MP includes three components implemented into the Epsilon framework. First, modelers can define domain-specific rules that customize the merging process. Second, E3MP enables an automated method for syntactic and semantic conflict detection amongst different versions of the system model. Third, E3MP puts forward a pattern-based approach for conflict resolution. We applied two generic benchmarks to assess conflict detection and resolution capabilities of our approach and carried out an initial scalability evaluation for the model merge with large models and large change sets. The results of our experiments revealed that the proposed process allows generating consistent and semantically correct merged models.     

Pricing strategies for information goods

Digital or information goods are becoming the norm across a wide variety of industries including books, music, entertainment, gaming and education. Due to the fact that the marginal cost of producing or reproducing information goods is very low, it is much easier to customise and personalise them for individual users. Furthermore, sellers of these information goods are increasingly using bundling and versioning strategies to appropriate a greater share of the surplus. This paper examines recent research on pricing of information goods with particular focus on customisation, bundling and versioning strategies adopted by information goods providers. The paper highlights both game-theoretic as well as optimisation models that not only provide different perspectives, but also examine issues of information goods pricing at different levels of abstraction and complexity.     

基于版本化模型的配电网辅助设计系统的实现

分析了利用配网GIS系统进行工程辅助设计时存在的问题,并结合配电网规划应用需求,提出了一套完整的基于版本化模型技术的配电网辅助设计系统的开发技术和方法。基于版本化模型技术的配电网辅助设计系统实施之后,升级和改造了现有的GIS系统架构,实现了版本化编辑和存储,并在统一数据库对象、同图显示和编辑界面等方面实现了电网的统一建模。