软件分散开发系统中协同支持机制的结构模型

提出了一个软件分散开发系统中协同机制的结构模型ＧＯＭ／ＤＤ,它以角色和为实现对共享对象的访问控制,同时它还提供了一种语言来设计或动态改变通道的功能。     

A Metamodel for Assessable Software Development Methodologies

Software development methodologies usually contain guidance on what steps to follow in order to obtain the desired product. At the same time, capability assessment frameworks usually assess the process that is followed on a project in practice in the context of a process reference model, defined separately and independently of any particular methodology. This results in the need for extra effort when trying to match a given process reference model with an organisation’s enacted processes. This paper introduces a metamodel for the definition of assessable methodologies, that is, methodologies that are constructed with assessment in mind and that contain a built-in process reference model. Organisations using methodologies built from this metamodel will benefit from automatically ensuring that their executed work conforms to the appropriate assessment model. Cesar Gonzalez-Perez is a post-doctoral research fellow in the Faculty of Information Technology at UTS, where he is currently researching with Professor Henderson-Sellers in object-oriented methodologies, with particular emphasis on metamodelling and component-based, assessable methodologies. He is the founder and former technical director of Neco, a company based in Spain specializing in software development support services, which include the deployment and use of the OPEN/Metis methodology at small and mid-sized organizations. He has also worked for the University of Santiago de Compostela in Spain as a researcher in computing & archaeology, and received his Ph.D. in this topic in 2000. Tom McBride has more than twenty years in the computer industry in positions ranging from computer operator, developer, project manager to QA manager. He is significantly involved in standards development, both locally in Australia and internationally for the International Standards Organisation. Tom is Chairman of the Australian Computer Society National Standards Committee and is assisting the development of the OOSPICE Component Based Development methodology. He is also a lecturer in software development-related subjects at the University of Technology, Sydney and is currently enrolled as a Ph.D.student investigating coordination in software development. Brian Henderson-Sellers is Director of the Centre for Object Technology Applications and Research and Professor of Information Systems at UTS. He is author of eleven books on object technology and is well-known for his work in OO methodologies (MOSES, COMMA, OPEN, OOSPICE) and in OO metrics. Brian has been Regional Editor of Object-Oriented Systems, a member of the editorial board of Object Magazine/Component Strategies and Object Expert for many years and is currently on the editorial board of Journal of Object Technology and Software and Systems Modelling. He was the Founder of the Object-Oriented Special Interest Group of the Australian Computer Society (NSW Branch) and Chairman of the Computerworld Object Developers’ Awards committee for ObjectWorld 94 and 95 (Sydney). He is a frequent, invited speaker at international OT conferences. In 1999, he was voted number 3 in the Who’s Who of Object Technology (Handbook of Object Technology, CRC Press, Appendix N). He is currently a member of the Review Panel for the OMG’s Software Process Engineering Model (SPEM) standards initiative and is a member of the UML 2.0 review team. In July 2001, Professor Henderson-Sellers was awarded a Doctor of Science (D.Sc.) from the University of London for his research contributions in object-oriented methodologies.     

监控使能的分布式软件系统构造方法

针对开放的网络环境中大型分布式软件的调试、调优、维护和可信演化问题,提出了伴随式的监控使能分布式软件构造方法.基于发布/订阅的分布计算模型,提出了被监控对象的业务逻辑和监控逻辑分离的运行时体系结构;基于面向方面编程思想,提出了监控使能的分布式软件开发方法和工具,降低了监控实施代价,增强了代码的可维护性;基于运行时体系结构,提出了监控系统的动态可定制部署方法.监控使能的分布式软件构造方法能够在开发时控制功能代码和非功能代码的纠结,尽可能地降低软件编程人员的代码维护难度;能够在部署时保证监控系统和被监控对象的松耦合;能够在运行时实现监控信息的按需汇聚和按需处理.从而在对系统核心业务的影响尽可能小的前提下.获得对系统运行行为尽可能全面的理解.     

Managing Software Development for Survivable Systems

The environment in which software projects are managed has evolved dramatically in recent years. This evolution has been driven by an extraordinary increase in network connectivity and extensive use of contractors for system development, raising issues of interoperability, security, ownership, and intellectual property rights. Project managers face the ongoing challenge of creating an orderly incremental development process, which often proceeds for years, in this complex environment. At the same time, the dependency of organizations, their suppliers, and their customers on complex, large-scale information systems is increasing at an astonishing rate, to the point that conduct of business operations is virtually impossible if these systems are compromised. As a result, survivability is receiving increasing attention as a key property of critical systems. Survivability is the capability of a system to fulfill its mission, in a timely manner, in the presence of attacks, failures, or accidents. Given the severe consequences of system failure, it is clear that many more organizations should be, and at present are not, concerned with survivability issues. However, when survivability is added to the project management equation, software life cycles can look rather different from the traditional life-cycle model. In this paper we discuss this changing software project management environment, the impact of system survivability, and life-cycle activities that are tailored to development and evolution of survivable systems. Achieving survivable systems requires that survivability be integrated into project life cycles, and not treated as an add-on property.     

基于体系结构模型检查分布式控制系统

分布控制系统是大量硬件设备通过计算机系统得以控制和协调的高度复杂系统,它们也是任务统,需要保障其功能的高度正确性和可靠性.分析复杂控制系统的过程包含了证明或验证设计的系统确实满足某种需求.但由于系统的复杂度,有效分析系统是相当困难的.从系统设计和分析的角度看,基于体系结构方法可以运用层次化构造和抽象的方法来减小模型复杂度.模型检查技术是分析复杂系统构造满足正确和可靠性需求的有效方法.结合软件体系结构描述方法和模型检查技术,提出了基于体系结构的分布式控制系统形式分析方法,通过楼宇综合控制系统实例研究,展示了该方法在提高分布式控制系统设计质量方面的效果.     

Framework for Effective Utilization of Distributed Scrum in Software Projects

There is an emerging interest in using agile methodologies in Global Software Development (GSD) to get the mutual benefits of both methods. Scrum is currently admired by many development teams as an agile most known methodology and considered adequate for collocated teams. At the same time, stakeholders in GSD are dispersed by geographical, temporal, and socio-cultural distances. Due to the controversial nature of Scrum and GSD, many significant challenges arise that might restrict the use of Scrum in GSD. We conducted a Systematic Literature Review (SLR) by following Kitchenham guidelines to identify the challenges that limit the use of Scrum in GSD and to explore the mitigation strategies adopted by practitioners to resolve the challenges. To validate our review findings, we conducted an industrial survey of 305 practitioners. The results of our study are consolidated into a research framework. The framework represents current best practices and recommendations to mitigate the identified distributed scrum challenges and is validated by five experts of distributed Scrum. Results of the expert review were found supportive, reflecting that the framework will help the stakeholders deliver sustainable products by effectively mitigating the identified challenges.     

面向分布式处理的WebGIS平台软件开发

目前已有许多WebGIS平台软件,但在分布式数据访问处理这个问题上,尚无完全成熟的解决方案。在研究和分析国内外已有WebGIS软件技术的基础上,探索了分布式WebGIS系统的实现方案,采用Java技术从底层开发了一个WebGIS平台软件。利用该软件所建立的基于SIG的城市空间信息服务系统原型能够实现对分布式空间数据的访问操作,为进一步实现分布式异构数据的共享和互操作打下了一个基础。     

一种分布式实时系统软件体系结构

针对分布式实时系统的软件体系结构进行了深入研究，试图为应用开发者提供一个开发分布式实时系统的通用框架，首先提出由事件总线和数据访问总线组成具有开放结构的分布式实时系统的参考模型，然后详细讨论了事件总线和数据访问总线的组成成分，工作原理和工作过程，最后，研究了支持平台的单一映象编程模型，实时QoS的支持，提供主动服务机制，灵活开放的系统结构等技术特点。     

多核系统的软件开发方法

针对大规模多核系统软件开发过程中产生的问题,论述一套完整的开发方法,阐述该方法中可行性分析、并行模式分解、数据和任务依赖性分析、并行算法设计、并行编程模式的选择、编码和性能优化等步骤的实施要点。实践证明,该方法可用于指导编程人员开发多核应用程序,具有实际应用价值。     

Optimizing OpenMP Programs on Software Distributed Shared Memory Systems

This paper describes compiler techniques that can translate standard OpenMP applications into code for distributed computer systems. OpenMP has emerged as an important model and language extension for shared-memory parallel programming. However, despite OpenMP's success on these platforms, it is not currently being used on distributed system. The long-term goal of our project is to quantify the degree to which such a use is possible and develop supporting compiler techniques. Our present compiler techniques translate OpenMP programs into a form suitable for execution on a Software DSM system. We have implemented a compiler that performs this basic translation, and we have studied a number of hand optimizations that improve the baseline performance. Our approach complements related efforts that have proposed language extensions for efficient execution of OpenMP programs on distributed systems. Our results show that, while kernel benchmarks can show high efficiency of OpenMP programs on distributed systems, full applications need careful consideration of shared data access patterns. A naive translation (similar to OpenMP compilers for SMPs) leads to acceptable performance in very few applications only. However, additional optimizations, including access privatization, selective touch, and dynamic scheduling, resulting in 31% average improvement on our benchmarks.