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71.
Professor Russell J. Abbott 《Journal of Systems Integration》1991,1(2):143-162
The nature of interfaces is discussed. It is recommended that modern software approaches to interfaces (such as abstract data
types) be extended to interfaces of all kinds. These interfaces can and should be developed at the level of abstraction appropriate
to the interacting elements, rather than at the level of their lowest common denominator, which is frequently the case. It
is proposed that for an interface to exist at any level of abstraction, there must be an operational framework that implements
that level of abstraction and within which the interfacing elements interact. Four tasks required for the development of interfaces
are described. The traditional classification of interfaces as hardware/software, software/software, and hardware/hardware
is found wanting and a new partitioning is suggested—structural or interpretive interfaces, symbolic interfaces, and physical
interfaces. Standards and scientific and engineering theories are shown to define levels of abstraction for general interfaces
in much the same way that programming languages do for software interfaces. Implications for software engineering and concurrent
engineering are explored. 相似文献
72.
面向用户构造企业信息系统 总被引:6,自引:0,他引:6
本文在对当前企业中信息系统面临的问题进行分析的基础上,提出了面向用户构造企业信息系统的方法,即全面考察实际系统中对象的整个生命周期过程和对象间的内在联系,使设计出的应用系统可由最终用户自行调整,以适应实际系统的信息需求的变化。论文提出了面向用户的企业信息系统的软件结构,最后简要介绍了采用面向用户方法进行开发的实例。 相似文献
73.
In recent years computers have been incorporated into large scale systems such as nuclear plant, flight control, and manufacturing systems. Such Computer Integrated Systems (CIS) normally consist of heterogeneous subsystems. The integration of heterogeneous subsystems requires that the subsystems be portable, inter-operable, and integrable at both software and hardware levels so that the integrated system should function properly. Objects and nets are proposed as the atomic elements of CIS's. An object is defined as a computational model of an arbitrary entity. Then three representation schemes of an object are introduced: algebraic, modular, and graphical. Two operations on objects,Composition andUnion, are introduced as means of combining two objects into a larger one. As an application of this approach, a Computer Integrated Manufacturing (CIM) system is represented as a network of objects. 相似文献
74.
75.
76.
广东省地区电网外网等值自动生成系统设计 总被引:25,自引:8,他引:17
为了使地区电网能量管理系统(EMS)计算准确,需要省级电网调度中心自动计算并发送外网等值信息。为此,设计了便于地区电网应用的外网等值参数自动生成系统框架。该系统实时反映网络拓扑的变化,并与动态等值计算参数相配合,以公用对象请求代理程序结构(CORBA)规范完成数据通信平台,按公用信息模型(CIM)标准完成从SCADA/EMS的模型转化,随时为地区电网实时网络分析提供开放、灵活、方便的外网等值模型,大大减少了地区电网EMS的维护工作量,提高了计算精度。 相似文献
77.
随着信息安全问题受到越来越多的关注,安全管理工具也得到广泛应用。公共信息模型(CIM)目前仍是一个较新的发展领域,近年来越来越多地被应用到各项管理平台。针对信息安全管理的现状和需求,论文提出了一种基于CIM的安全预警系统的构思和建模:利用CIM对系统状态、攻击策略等对象进行建模,从关联关系和状态变化事件中发现安全隐患,从而实现对潜在的安全威胁的预警。 相似文献
78.
H. -C. Zhang PhD L. Alting 《The International Journal of Advanced Manufacturing Technology》1992,7(2):101-108
With the increasing application of high technology in manufacturing enterprises, the traditional serial or sequential production
approach has begun to be replaced by a parallel or simultaneous production approach. The functional balance of organisations
of current manufacturing enterprises is decline. The organisation within manufacturing enterprises needs to be restructured
and the functions need to be adjusted. Many production functions within an enterprise can be integrated by following the production
information. This is the premise of this exploration of simultaneous engineering in manufacturing enterprises. A functional
model of an enterprise is described in this paper. Some possibilities of functional integration within an enterprise are discussed.
Finally, some related research activities are outlined to stimulate an open discussion on the point of view. 相似文献
79.
计算机数控集成技术的发展 总被引:14,自引:0,他引:14
综述了国内外计算机数控接口的发展现状,简述了计算机数控集成系统的结构,阐述了基于DNC的集成系统的发展背景,提出了计算机数控集成技术的几点发展趋势。 相似文献
80.
M. Sadaiah D. R. Yadav P. V. Mohanram P. Radhakrishnan 《The International Journal of Advanced Manufacturing Technology》2002,20(10):709-719
This paper deals with design and development of a generative computer-aided process planning (CAPP) system for prismatic components
and named PSG-CAPP. The proposed CAPP system has been divided into three modules. The first module is concerned with feature
extraction. The second and third modules deal with planning the set-up, machine selection, cutting tool selection, cutting
parameter selection, and generation of process plan sheet. The whole CAPP system is developed using Visual Basic 6.0 as front
end and Oracle 7.3 as back end. The SolidWorks98 plus has been used for modelling, and feature extraction has been implemented
using a program written in Visual Basic 6.0. The speciality of the developed CAPP system is that it is linked with the CAD
module and it extracts the majority of features automatically prior to process planning. The developed CAPP system has been
tested with aerospace components. The main feature of the proposed CAPP system is its ability to handle a variety of prismatic
components and generate process plans for them. A case study has been included to highlight the potential of the CAPP system.
ID="A1"Correspondance and offprint requests to: Professor P. V. Mohanram, Department of Mechanical Engineering, PSG College of Technology, Peelamedu, Coimbatore 641004,
India. E-mail: msadaiah@yahoo.com 相似文献