A tool for design pattern detection and software architecture reconstruction

It is well known that software maintenance and evolution are expensive activities, both in terms of invested time and money. Reverse engineering activities support the obtainment of abstractions and views from a target system that should help the engineers to maintain, evolve and eventually re-engineer it. Two important tasks pursued by reverse engineering are design pattern detection and software architecture reconstruction, whose main objectives are the identification of the design patterns that have been used in the implementation of a system as well as the generation of views placed at different levels of abstractions, which let the practitioners focus on the overall architecture of the system without worrying about the programming details it has been implemented with.In this context we propose an Eclipse plug-in called MARPLE (Metrics and Architecture Reconstruction Plug-in for Eclipse), which supports both the detection of design patterns and software architecture reconstruction activities through the use of basic elements and metrics that are mechanically extracted from the source code. The development of this platform is mainly based on the exploitation of the Eclipse framework and plug-ins as well as of different Java libraries for data access and graph management and visualization. In this paper we focus our attention on the design pattern detection process.     

软件功能测试管理模型在上海轨道交通AFC系统中的应用

上海轨道交通的线路数逐年递增,随之自动售检票系统的规模越来越大,如何管理由于自动售检票系统的应用软件版本不断升级带来的软件功能测试的管理问题亟待解决本文借鉴ITIL思想,提出一个针对软件功能测试的管理模型应用表明,该模型在上海轨道交通自动售检票系统的测试管理中是成功和有效的     

Quantifying requirements elaboration to improve early software cost estimation

This paper describes an empirical study undertaken to investigate the quantitative aspects of the phenomenon of requirements elaboration which deals with transformation of high-level goals into low-level requirements. Prior knowledge of the magnitude of requirements elaboration is instrumental in developing early estimates of a project’s cost and schedule. This study examines the data on two different types of goals and requirements - capability and level of service (LOS) - of 20 real-client, graduate-student, team projects done at USC. Metrics for data collection and analyses are described along with the utility of results they produce. Besides revealing a marked difference between the elaboration of capability goals and the elaboration of LOS goals, these results provide some initial relationships between the nature of projects and their ratios of elaboration of capability goals into capability or functional requirements.     

浅析计算机软硬件故障的防治方法

随着计算机技术的发展与普及，使得计算机在我们的生产生活中发挥着越来越重要的作用。然而在计算机的使用过程中，往往出现由于设备使用不当或意外受损等故障。因此，若要准确快速地排除计算机故障，就要求我们必须掌握一定的基本理论知识和故障处理技巧。本文主要是对我国计算机软硬件故障的防治现状进行探讨分析，从中找出问题所在，并提出相应的解决措施。     

基于数据挖掘技术在软件项目风险管理决策系统的研究

根据软件项目风险管理数据特点,提出了基于数据挖掘技术的软件项目风险管理决策系统的分层体系结构和挖掘模型。     

Selection of strategies in judgment-based effort estimation

We currently know little about the factors that motivate the selection and change of strategy in judgment-based effort estimation. A better understanding of these issues may lead to more accurate judgment-based effort estimates and motivates the four experiments reported in this paper. The experiments’ two main results are the identification of the importance of “estimation surprises” (large estimation errors) to motivate estimation strategy change and the large individual variation in the initial choice of estimation strategy. The individual variation seems not only to be a result of differences in previous experiences, but also a result of differences in the mental “accessibility” of the strategies. We found, for example, that the use of a type of strategy was increased when we instructed a developer to use the same type of strategy on unrelated tasks immediately before.     

Programming with C++ concepts

This paper explores the definition, applications, and limitations of concepts and concept maps in C++, with a focus on library composition. We also compare and contrast concepts to adaptation mechanisms in other languages.Efficient, non-intrusive adaptation mechanisms are essential when adapting data structures to a library’s API. Development with reusable components is a widely practiced method of building software. Components vary in form, ranging from source code to non-modifiable binary libraries. The Concepts language features, slated to appear in the next version of C++, have been designed with such compositions in mind, promising an improved ability to create generic, non-intrusive, efficient, and identity-preserving adapters.We report on two cases of data structure adaptation between different libraries, and illustrate best practices and idioms. First, we adapt GUI widgets from several libraries, with differing APIs, for use with a generic layout engine. We further develop this example to describe the run-time concept idiom, extending the applicability of concepts to domains where run-time polymorphism is required. Second, we compose an image processing library and a graph algorithm library, by making use of a transparent adaptation layer, enabling the efficient application of graph algorithms to the image processing domain. We use the adaptation layer to realize a few key algorithms, and report little or no performance degradation.     

基于Pro/E软件对壳体类零件的设计

以某型号连接盘为例,研究了使用Pro/E软件进行从零件、铸件到铸造模具的设计过程。阐述了产品开发中零件的建模应兼顾制造时的各种工艺建模,其中详述了为使铸件及铸造模具的设计顺利进行,零件和铸件三维建模过程应遵循的一定顺序及一些技巧。铸造模具建模前先建工艺模型,对型芯头、起模斜度等工艺措施在工艺模型中给予建立,然后用工艺模型将型芯和外模分拆出来,可减少分别建模时可能出现的失误,提高模具的精度,缩短产品的市场化周期。     

一种基于SURFER8．0与CASS2008的两期土方填挖边界线的确定方法

本文针对市场上的土方计算软件少有能够确定两期土方计算中填挖边界线这一问题进行了探讨．结合Gold Software Surfer以及南方CASS数字化地形地籍成图系统给出了解决方法，该方法简单实用，具有一定的应用价值。