基于构件复用的社会化软件工程模式

论述社会化软件工程概念,提出了基于构件复用的社会化软件工程模式。在该模式下,软件生产分为软件构件生产和应用软件生产,两类生产都通过全球网,按照市场机制,分工合作,形成全新的软件生产模式。为了适应这种生产模式,一种新型的ＣＡＳＥ被提出,这种ＣＡＳＥ分为构件生产ＣＡＳＥ和应用软件生产ＣＡＳＥ。文中介绍了这种ＣＡＳＥ的结构,并且分析了与传统ＣＤＳＥ的区别。     

DCOM／ActiveX和CORBA的比较

本文从企业计算的角度,从集成性、可用性和可扩展性三个方面较为详细的比较了ＤＣＯＭ／ＡｃｔｉｖｅＸ和ＣＯＲＢＡ这两种当今最主要的分布式构件模型。     

一种构件化的动态软件系统模型

本文提出一种构件化的动态软件系统模型ＣＬＡＳ,其基本思想是用系统的宏观逻辑描述来联结实现系统具体功能的构件,从而组成完整的软件系统。在ＣＬＡＳ模型中,系统的构件化使软件的复用性大大提高,而逻辑与实现的分离又明显改善了系统的灵活性和逻辑可扩充性。     

基于Agent的分布式构件库互联框架设计

随着互联网和基于构件的软件复用的飞速发展,各地公共构件库和企业构件库积聚了大量可复用构件,分布式构件库之间进行信息交互的需求也变得十分迫切。为增进分布式构件库尤其是公共构件库和企业构件库间的信息交互,从构件库及互操作知识入手,借助软件Agent技术进行了互联框架和交互方式的设计,制定了分布式构件库间用于构件信息交互的公共描述模型,给企业用户提供了便利的个性化服务,也为更大范围的分布式构件库互联体系的建立奠定了基础。     

一个基于构件的分布式多媒体存取机制CDMAM

本文提出了一种分布式多媒体存取机制ＣＤＭＡＭ,ＣＤＭＡＭ基于多媒体数据处理的流水线模型,以构件作为分布式多媒体数据存取基础,实现了媒体基本处理、ＱＯＳ状态调整以及同步控制等功能,通过构件管理器,ＣＤＭＡＭ实现了网络透明和平台无关。     

集成化CAD系统设计中的若干问题

集成化ＣＡＤ系统能保证信息在设计过程中的畅通和高效利用。探索理想的集成方式，是当前ＣＡＤ／ＣＡＭ在发展中所面临的技术难题。本文根据“城市桥梁工程集成化ＣＡＤ系统”的研究工作，就集成系统设计中的几个关键问题进行了探讨和分析。     

集成化CAD系统设计中的若干问题

集成化ＣＡＤ系统能保证信息在设计过程中的畅通和高效利用。探索理想的集成方式，是当前ＣＡＤ／ＣＡＭ在发展中所面临的技术难题。本文根据“城市桥梁工程集成化ＣＡＤ系统”的研究工作，就集成系统设计中的几个关键问题进行了探讨和分析。     

基于重用技术的冲模CAD软件开发环境的研究

基于软件重用技术原理,论述了一种冲模ＣＡＤ软件的可重用机制及其开发环境,提出了可重用冲模ＣＡＤ软构件的定义,分类,描述特征信息及其管理,可重用软构件的检索算法,并给出冲模ＣＡＤ系统可重用开发环境的功能模型。     

软件构件化技术及其在桥梁CAD中的应用

软件构件化是当今软件工业发展的主流,介绍了软件的构件化开发技术和构件对象模型ＣＯＭ,并针对我国当前桥梁ＣＡＤ软件发展的现状,提出了采用构件化技术开发ＣＡＤ软件系统的必要性,最后结合一个简单实例说明了其可行性。     

基于ALOAF的分布式构件库框架模型

软件复用是解决软件危机的重要手段,构件库是软件复用的重要的技术支撑之一,为了进一步提高构件重用的可能性和效率,支持构件库的分布式访问,提出了基于ALOAF模型和CORBA技术的分布式构件库框架模型。文中讨论了开放体系结构的构件库框架(ALOAF)、CORBA技术和基于ALOAF分布式构件库框架模型的层次结构,并给出了基于中介服务器该模型的一种实现方案。在此基础上,以VisiBroker中间件和ORACLE数据库为支撑,采用JBUILDER9开发工具,开发了一个分布式构件库原型系统,验证了分布式构件库实现方案的可行性和有效性。     

CAD应用框架配置技术研究

为满足CAD软件研发中应用框架扩展、复用及调整的需求,论文提出了应用框架基于配置的动态设计方案,并给出了实现的模块划分及流程;同时研究并给出了CAD软件功能配置的层次结构及内容,基于此研究,相同的软件框架在不同的配置下可以开发成为不同的CAD应用或控件,而且不同的CAD软件通过配置合并可以实现框架的集成及功能复用。该技术已在实际的CAD软件开发中得到应用验证。     

CAD系统绘图帮助功能的可复用设计

从软件复用的角度设计了一个DHF,用来实现CAD系统中的绘图帮助功能．DHF具有良好的复用性,已经应用在一个盒型CAD系统中;同时,它还可以被复用到其他CAD系统中．     

基于CSCW的CAD系统协作支持技术与支持工具的研究

计算机支持的协同工作（CSCW）给CAD技术带来重大发展，但仍然存在许多问题。其中之一是缺乏将协作性能同应用功能有机结合的方法。文中在分析的现有协作支持技术，工具和系统不足的基础上，提出了用协作支持工具软件CoCADToolAgent改造商品化CAD系统来开发CSCD系统的新思路和总体技术路线，给出了通讯支持，协议，一致性维护和并发控制，协同感知，任务和脚色机制的有效的实现方法，作为本方法的一个应用实例，成功地将传统的人机交互式CAD系统AutoCAD转变为网络环境下支持人人交互的CSCD原型系统，作为专用协作支持工具，CoCADToolAgent比NetMeeting之类的通用协作支持工具具有更好的协作性能，该方法可推广到三维CAD系统。     

CAD与CAM系统集成研究与实现

介绍了CAD模型数据的检取技术和格式转换技术,描述了CAD/CAM的总体框架,并对实现该框架所涉及的内容及其实现技术进行了深入研究,同时给出了在Solidworks环境下所实现的CAD/CAM系统集成的实例。     

An efficient GPU out‐of‐core framework for interactive rendering of large‐scale CAD models

Real‐time rendering of large‐scale engineering computer‐aided design (CAD) models has been recognized as a challenging task. Because of the constraints of limited graphics processing unit (GPU) memory size and computation capacity, a massive model with hundreds of millions of triangles cannot be loaded and rendered in real‐time using most of modern GPUs. In this paper, an efficient GPU out‐of‐core framework is proposed for interactively visualizing large‐scale CAD models. To improve efficiency of data fetching from CPU host memory to GPU device memory, a parallel offline geometry compression scheme is introduced to minimize the storage cost of each primitive by compressing the levels of detail (LOD) geometries into a highly compact format. At the rendering stage, occlusion culling and LOD processing algorithms are integrated and implemented with an efficient GPU‐based approach to determine a minimal scale of primitives to be transferred for each frame. A prototype software system is developed to preprocess and render massive CAD models with the proposed framework. Experimental results show that users can walkthrough massive CAD models with hundreds of millions of triangles at high frame rates using our framework. Copyright © 2016 John Wiley & Sons, Ltd.     

The application of ubiquitous multimodal synchronous data capture in CAD

Design is an interactive and iterative process where the designer’s skills and knowledge are fused with emotive rationales aided by design tools. A design solution is thus influenced by the designer’s creativity, experience and emotional perception. Consequently, there is a need within computer aided design (CAD) research for ubiquitous tools to capture the affective states of engineers during design activities to further understand the product design process.This paper proposes a generic framework for ubiquitous multimodal synchronous data capture, based around the capture of CAD system activities, to monitor and log a variety of inputs, interactions, biophysical data and design solutions with a view to providing meta and chronological performance data for post design task analysis. The framework has been employed in two use cases namely, a CAD station activity and a collaborative design review. The results of these trials validated the architecture and use of the ubiquitous data capture approach demonstrating the practical application of time-phased data capture, analysis and the subsequent output of metadata in CAD environments providing a new perspective on, and a new way of investigating CAD-based design activities.This research also extrapolates the framework’s usefulness into future CAD and PLM systems by arguing why and how they need to adopt such ubiquitous platforms. It also subjectively points to potential opportunities and issues that might arise when implementing the ubiquitous multimodal metadata architecture in a real-life environment.     

Design frameworks for concurrent engineering

As technological tasks in manufacturing environment have become progressively complicated, today's designers are confronted not only with increasing complexity of product designs but also with constantly increasing number and complexity of specialized design tools. The entire design process has consequently become very complicated. A large number of highly specialized design tools have to be developed to meet the technological needs of complex design tasks, and integrated into a computer-aided design (CAD) framework to provide better services to users. The concept of the framework may be of special interest to those who try to implement the philosophy of concurrent engineering, because a large number of design tools are required during the design phase to examine the entire aspects of a product's life-cycle in a coherent way. This paper identifies the needs and requirements of such CAD frameworks for concurrent engineering environment and discussed the object-oriented paradigm which has several salient features applicable to the development of control mechanisms for CAD tools within the framework.     

基于Internet虚拟企业的ASP框架模型

阐述了在虚拟企业环境中实现ASP（Application Server Provider)的框架模型，分析了其实现机理，并制作了一个用于CAD图形文件格式转换的虚拟环境下的ASP服务系统的原型系统。在虚拟企业环境中，企业之间的服务功能是虚拟企业的关键问题，为之提出了具体的实现框架和实现过程。作为原型系统，建立了一个基于Internet的CAD图形文件转换服务系统，可以提供IGES／STEP／VDA／VRML／prt等文件格式的转换服务。     

A language for representing and extracting 3D geometry semantics from paper-based sketches

Every product that exists, ranging from a toothbrush to a car, has first been conceived as a mental concept. Due to its efficacy in rapidly externalizing concepts, paper-based sketching is still extensively used by practising designers to gradually develop the three-dimensional (3D) geometric form of a concept. It is a common practice that form concepts are sketched on paper prior to generating 3D virtual models in commercial Computer-Aided Design (CAD) systems. However, the user-interface of such systems does not support automatic generation of 3D models from sketches. Furthermore, the inherent characteristics of form sketching (e.g. idiosyncrasy) pose a challenge to computer-based understanding of the form concept semantics expressed on paper. To address these issues, this paper is therefore concerned with the development of a visual language that is prescribed and to be used by product designers to annotate paper-based sketches such that the form geometry semantics can be formally represented; parsing the annotated sketch allows for the automatic generation of 3D virtual models in CAD. Inspired by re-usable 3D CAD modelling functions and the related environmental constraints and requirements, a prescribed sketching language, PSL, has been developed to annotate paper-based form sketches. The framework architecture which parses the annotated sketch and subsequently extracts the form concept semantics is described. Based on this framework, a prototype computer tool has been implemented and evaluated. Evaluation results provide a degree of evidence, first on the suitability of PSL in representing the semantics of a range of forms, and secondly on the designers׳ acceptance of taking up this annotated sketching approach in practice.