基于可复用构件的系务管理信息系统的设计与实现

从理论研究的角度介绍了软件复用的基本概念和主要的构件技术,在此基础上重点讨论了基于可复用构件技术的软件复用,阐述了在系统开发中利用构件思想及应用的可行性,并对系务管理系统进行分析和可行性研究,在开发系务管理系统时遇到的有关软件复用方面的问题、解决方法以及实现策略.     

An integrative approach to requirements analysis: How task models support requirements reuse in a user-centric design framework

Many software systems fail to address their intended purpose because of a lack of user involvement and requirements deficiencies. This paper discusses the elaboration of a requirements-analysis process that integrates a critical-parameter-based approach to task modeling within a user-centric design framework. On one hand, adapting task models to capture requirements bridges the gap between scenarios and critical parameters which benefits design from the standpoint of user involvement and accurate requirements. On the other hand, using task models as a reusable component leverages requirements reuse which benefits design by increasing quality while simultaneously reducing development costs and time-to-market. First, we present the establishment of both a user-centric and reuse-centric requirements process along with its implementation within an integrated design tool suite. Secondly, we report the design, procedures, and findings of two user studies aimed at assessing the feasibility for novice designers to conduct the process as well as evaluating the resulting benefits upon requirements-analysis deliverables, requirements quality, and requirements reuse.     

基于独立软件级构件的领域软构件体系

简要地介绍了粒度为独立软件级构件的领域软构件体系的创建过程、系统结构、设计原理及其理论及实用意义。     

设计模式在标图系统中的综合应用

设计模式是优秀软件设计经验的总结,采用基于设计模式的方法进行系统设计将提高软件的可重用性。按照设计模式中“高内聚、低耦合”的原则,设计出一种标图系统的整体结构,并以Prototype, Template Method, Observer, Command, Composite和Singleton六种具体模式为例,详细阐述了它们在系统功能实现过程中的应用。标图系统的开发全过程充分体现了设计模式在提高软件可重用性和开发效率等方面的重要作用。     

一种用于嵌入式应用开发的软件体系结构*

研究从软件体系结构和应用开发过程两个角度对嵌入式应用开发作了改进和规范。在软件体系结构上采用了层模式和映像模式相结合的架构。在开发过程的规范和复用上采用了集成开发环境的思想。从改进后在实际应用开发中的结果来看,效果较为理想,值得进一步完善和推广。     

Reuse of reverse osmosis membranes in advanced wastewater treatment

In areas where tap water has a high salt content, wastewater is not appropriate for reuse in agriculture, particularly for sensitive crops. One alternative is reduction, via desalination, of the brackish character to the secondary effluent. A filtration stage is also required before desalination. On the other hand, used reverse osmosis membranes can be recycled and used as filters in the advanced treatment stage in order to reduce suspended matter contained in the secondary effluent—one advantage being the environmental recovery of solid waste. Used membranes can be treated with strong chemical oxidants to peel off the active separation layer in order to transform them into microfiltration or ultrafiltration elements. Preliminary tests have been carried out with 8″ elements, aimed at comparing membrane performance before and after the peeling process. An index denoted as peeling effectiveness (high flux, high salt passage) is used for comparison. It was soon observed that potassium permanganate was more effective than others, together with sodium hydroxide. Doses around 1000 mg/L KMnO₄ provided the best results. It was also concluded that membrane cleaning, done with sodium bisulphite prior to peeling, was better when recirculating the cleaning solution around the membrane rather than soaking it. Next steps in the research will test the actual filtration capability of the peeled membranes in actual wastewater.     

Recovery of magnetic ionic liquid [bmim]FeCl<Subscript>4</Subscript> using electromagnet

Recovery of 1-butyl-3-methylimidazolium tetrachloroferrate ([bmim]FeCl₄) from its mixture with water was investigated. The [bmim]FeCl₄ rich phase in the mixture forming two-phase was successfully separated, while homogeneous mixtures could not be separated. However, the concentration of the homogeneous mixture varied as a function of the magnetic field strength. Therefore, a combination of magnetic field and conventional methods to recover magnetic ILs from reaction mixtures will be very useful and have great potential.     

Towards an ontology-based retrieval of UML Class Diagrams

Context

Software Reuse has always been an important area amongst software companies in order to increase their productivity and the quality of their products, but code reuse is not the only answer for this. Nowadays, reuse techniques proposals include software designs or even software specifications. Therefore, this research focuses on software design, specifically on UML Class Diagrams. A semantic technology has been applied to facilitate the retrieval process for an effective reuse.

Objective

This research proposes an ontology-based retrieval technique by semantic similarity in order to support effective retrieval process for UML Class Diagrams. Since UML Class Diagrams are a de facto standard in the design stages of a Software Development Process, a good technique is needed to reuse them, i.e. reusing during the design stage instead of just the coding stages.

Method

An application ontology modeled using UML specifications was designed to compare UML Class Diagram element types. To measure their similarity, a survey was conducted amongst UML experts. Query expansion was improved by a domain ontology supporting the retrieval phase. The calculus of minimal distances in ontologies was solved using a shortest path algorithm.

Results

The case study shows the domain ontology importance in the UML Class Diagram retrieval process as well as the importance of an element type expansion method, such as an application ontology. A correlation between the query complexity and retrieved elements has been identified, by analyzing results. Finally, a positive Return of Investment (ROI) was estimated using Poulin’s Model.

Conclusion

Because Software Reuse has not to be limited to the coding stage, approaches to reuse design stage must be developed, i.e. UML Class Diagrams reuse. This approach proposes a technique for UML Class Diagrams retrieval, which is one important step towards reuse. Semantic technology combined with information retrieval improves the retrieval results.     

北京市"中水"回用系统分析与优化

利用系统论基本原理,通过对北京市中水回用系统的结构分析、要素考察,优化中水供给、输送和利用环节,完善系统体系结构,判明系统发展方向,从而加强中水管理,提高中水利用效率,进一步达到减少污水排放量和治理污染源,节约和保护有限水资源、挖掘水资源承载能力和保护生态环境的目的。     

炼钢轧钢外排污水回用的可行性研究

埋入式磁分离水处理装置成功处理轧钢、炼钢浊循环水,是济钢在实践中发明的专利技术。济钢中板厂利用其技术处理轧钢浊循环水,处理量450m3/h。山东泰山钢铁有限公司拟采用此技术处理炼钢、轧钢外排污水,处理水质达到回用水水质标准。