Extending UML to model Web 2.0‐based context‐aware applications

Web 2.0 Mashups offer entirely new opportunities for context‐aware application (CAA) developers by integrating Web 2.0 technologies to facilitate interoperability among heterogeneous context‐aware systems. From a software engineering perspective, a visualized approach for Web 2.0‐based CAA modeling is crucial. Current CAA development, however, cannot provide a conceptual model for Web 2.0‐based CAA. Therefore, the development efficiency and potential for reuse are decreased. The UML is a general purpose modeling language with potential for use in many application domains. However, UML often lacks elements needed to model concepts in specific domains, such as Web 2.0‐based CAA modeling. To address the above issues, this study presents the Web 2.0‐based CAA UML profile, a UML profile for modeling Web 2.0‐based CAA. Copyright © 2011 John Wiley & Sons, Ltd.     

Preventing user interface disasters

Abstract

This article defines a quantitative goal that is cheap to measure for the usability of a business application system for casual users. The article also describes a cost-effective method for attaining the goal. The goal is to eliminate all user interface disasters (UIDs) in a given system. UIDs are usability problems that seriously annoy users, or prevent them from accomplishing their work without help from a human being. The method consists of series of simple user tests without audio or video recording, and with little analysis after each user test. The article concludes by describing Baltica's results of applying the method to a medium-size business application for casual users.     

A model-driven process for the modernization of component-based systems

Software modernization is critical for organizations that need cost-effective solutions to deal with the rapid obsolescence of software and the increasing demand for new functionality. This paper presents the XIRUP modernization methodology, which proposes a highly iterative process, structured into four phases: preliminary evaluation, understanding, building and migration. This modernization process is feature-driven, component-based, focused on the early elicitation of key information, and relies on a model-driven approach with extensive use of experience from the previous projects. XIRUP has been defined in the European IST project MOMOCS, which has also built a suite of support tools. This paper introduces the process using a case study that illustrates its activities, related tools and results. The discussion highlights the specific characteristics of modernization projects and how a customized methodology can take advantage of them.     

Behavioral adaptation of information systems through goal models

Customizing software to perfectly fit individual needs is becoming increasingly important in information systems engineering. Users want to be able to customize software behavior through reference to terms familiar to their diverse needs and experience. We present a requirements-driven approach to behavioral customization of software systems. Goal models are constructed to represent alternative behaviors that users can exhibit to achieve their goals. Customization information is then added to restrict the space of possibilities to those that fit specific users, contexts, or situations. Meanwhile, elements of the goal models are mapped to units of source code. This way, customization preferences posed at the requirements level are directly translated into system customizations. Our approach, which we apply to an on-line shopping cart system and an automated teller machine simulator, does not assume adoption of a particular development methodology, platform, or variability implementation technique and keeps the reasoning computation overhead from interfering with the execution of the configured application.     

基于DFS的工程图多层次图块信息提取

针对工程图信息提取过程中的图块多层次引用问题,利用深度优先搜索算法对引用图块信息进行提取。建立图块多层次引用关系,介绍节点深度定义、目标节点判定方法及引用图块搜索策略,设计多层次引用路径搜索算法,并开发应用程序模块,实现多层次引用图块的信息提取。应用结果表明,该方法的提取准确率较高。     

非机类工程图学闭环反馈教学改革与教学评价

根据非机类工程图学课程的特点及教学改革的实际需要,建立了一种新的非机类工程图学闭环反馈教学改革与教学评价体系.通过分析教学中存在的问题,对教材建设、工程训练、现代教学模式等进行了改革与实践,提出了以设计制图为指导思想、图学与其他学科有机融合的设想,并通过闭环反馈不断调整改革方案,使其不断得到完善.利用建立的评价方法评价了教学改革的效果,结果表明所提出的教学改革方法可有效地提高教学质量,有利于培养学生的工程素质及创新能力.     

基于catia的汽车手柄逆向设计及优化

本文阐述了逆向工程的概念及工作流程,通过利用逆向工程CAD软件—catia对汽车手柄的点云数据进行处理和曲面重构,并通过调节曲面控制点,后期斑马线检查与高亮分析检查这些关键技术,实现重构曲面的连续性,使重构曲面的误差控制在许可范围内,得到符合要求的高品质曲面。     

新建本科院校工科大学生艺术教育的探索实践--以常州工学院为例

新建本科院校工科大学的艺术教育水平参差不齐,如何借助艺术教育对工科大学生创新素质培养的积极作用推动高素质应用型人才的培养,常州工学院进行了积极探索实践,总结出“建设一个体系、完善两个保障、主抓三个阵地”的艺术教育途径,为新建本科院校工科大学生艺术教育提供了有益借鉴。     

基于反演法的智能车辆弯路换道轨迹跟踪控制

基于车辆的运动学模型,研究了具有非完整约束特性的智能车辆弯路换道的轨迹跟踪控制问题。结合弯曲车道的曲率半径,针对换道过程中车辆横向运动和纵向运动对换道轨迹的耦合作用,提出了一种适用于弯道的换道轨迹规划方法。根据换道轨迹,利用积分反演法,引入中间虚拟控制量,设计了轨迹跟踪控制算法,并用Lyapunov稳定性理论证明了控制系统的稳定性。仿真结果表明:该控制器可以保证车辆在弯路换道的轨迹跟踪误差一致有界收敛,且具有快速、准确跟踪和全局稳定的特性。     

基于总成特性的转向系统模型开发

建立了一个基于转向系统总成特性的实时动力学模型,由于该模型基于阿克曼转向机构的角位移传递比、扭矩传递比、机构柔性等特性,不需要过多的硬点位置参数,因此,适用于汽车预开发阶段的建模。模型中考虑了转向系统关键部件的动力学自由度,能够反映其瞬态变化过程。将其嵌入到14自由度整车模型的仿真代码中,进行某A级车操纵稳定性工况的仿真,并将仿真结果与场地试验数据进行对比,验证了模型的有效性。