225 research outputs found
Methodologies for CIM systems integration in small batch manufacturing
This thesis is concerned with identifying the problems and constraints faced by
small batch manufacturing companies during the implementation of Computer
Integrated Manufacturing (CIM). The main aim of this work is to recommend
generic solutions to these problems with particular regard to those constraints
arising because of the need for ClM systems integration involving both new and
existing systems and procedures. The work has involved the application of
modern computer technologies, including suitable hardware and software tools, in
an industrial environment.
Since the research has been undertaken with particular emphasis on the industrial
implementor's viewpoint, it is supported by the results of a two phased
implementation of computer based control systems within the machine shop of a
manufacturing company. This involved the specific implementation of a
Distributed Numerical Control system on a single machine in a group technology
cell of machines followed by the evolution of this system into Cell and Machine
Management Systems to provide a comprehensive decision support and
information distribution facility for the foremen and uperators within the cell. The
work also required the integration of these systems with existing Factory level
manufacturing control and CADCAM functions. Alternative approaches have
been investigated which may have been applicable under differing conditions and
the implications that this specific work has for CIM systems integration in small
batch manufacturing companies evaluated with regard not only to the users within
an industrial company but also the systems suppliers external to the company.
The work has resulted in certain generic contributions to knowledge by
complementing ClM systems integration research with regard to problems
encountered; cost implications; the use of appropriate methodologies including
the role of emerging international standard methods, tools and technologies and
also the importance of 'human integration' when implementing CIM systems in a
real industrial situation
A comparison of integration architectures
This paper presents GenSIF, a Generic Systems Integration Framework. GenSIF features a pre-planned development process on a domain-wide basis and facilitates system integration and project coordination for very large, complex and distributed systems. Domain analysis, integration architecture design and infrastructure design are identified as the three main components of GenSIF. In the next step we map Beilcore\u27s OSCA interoperability architecture, ANSA, IBM\u27s SAA and Bull\u27s DCM into GenSIF. Using the GenSIF concepts we compare each of these architectures.
GenSIF serves as a general framework to evaluate and position specific architecture. The OSCA architecture is used to discuss the impact of vendor architectures on application development.
All opinions expressed in this paper, especially with regard to the OSCA architecture, are the opinions of the author and do not necessarily reflect the point of view of any of the mentioned companies
Introduction to Directory Services
The Directory has grown to be an important OSI application as it acts as a focal point and general support for a number of other applications. This work first points out directory requirements in the OSI framework and other OSI applications, as the Mail Handling System. The first version of the X.500 standard is then described and some Directory related issues are discussed. In particular, X.500 Directory as a database system is examined and some directory service implementations are presented
Integrating legacy mainframe systems: architectural issues and solutions
For more than 30 years, mainframe computers have been the backbone of computing systems throughout the world. Even today it is estimated that some 80% of the worlds' data is held on such machines. However, new business requirements and pressure from evolving technologies, such as the Internet is pushing these existing systems to their limits and they are reaching breaking point. The Banking and Financial Sectors in particular have been relying on mainframes for the longest time to do their business and as a result it is they that feel these pressures the most.
In recent years there have been various solutions for enabling a re-engineering of these legacy systems. It quickly became clear that to completely rewrite them was not possible so various integration strategies emerged.
Out of these new integration strategies, the CORBA standard by the Object Management Group emerged as the strongest, providing a standards based solution that enabled the mainframe applications become a peer in a distributed computing environment.
However, the requirements did not stop there. The mainframe systems were reliable, secure, scalable and fast, so any integration strategy had to ensure that the new distributed systems did not lose any of these benefits. Various patterns or general solutions to the problem of meeting these requirements have arisen and this research looks at applying some of these patterns to mainframe based CORBA applications.
The purpose of this research is to examine some of the issues involved with making mainframebased legacy applications inter-operate with newer Object Oriented Technologies
A technology reference model for client/server software development
In today's highly competitive global economy, information resources representing enterprise-wide information are essential to the survival of an organization. The development of and increase in the use of personal computers and data communication networks are supporting or, in many cases, replacing the traditional computer mainstay of corporations. The client/server model incorporates mainframe programming with desktop applications on
personal computers. The aim of the research is to compile a technology model for the development of client/server
software. A comprehensive overview of the individual components of the client/server system is given. The different methodologies, tools and techniques that can be used are reviewed, as well as client/server-specific design issues. The research is intended to create a road map in the form of a Technology Reference Model for Client/Server Software Development.ComputingM. Sc. (Information Systems
Space station data system analysis/architecture study. Task 2: Options development, DR-5. Volume 2: Design options
The primary objective of Task 2 is the development of an information base that will support the conduct of trade studies and provide sufficient data to make key design/programmatic decisions. This includes: (1) the establishment of option categories that are most likely to influence Space Station Data System (SSDS) definition; (2) the identification of preferred options in each category; and (3) the characterization of these options with respect to performance attributes, constraints, cost and risk. This volume contains the options development for the design category. This category comprises alternative structures, configurations and techniques that can be used to develop designs that are responsive to the SSDS requirements. The specific areas discussed are software, including data base management and distributed operating systems; system architecture, including fault tolerance and system growth/automation/autonomy and system interfaces; time management; and system security/privacy. Also discussed are space communications and local area networking
Earth and environmental science in the 1980's: Part 1: Environmental data systems, supercomputer facilities and networks
Overview descriptions of on-line environmental data systems, supercomputer facilities, and networks are presented. Each description addresses the concepts of content, capability, and user access relevant to the point of view of potential utilization by the Earth and environmental science community. The information on similar systems or facilities is presented in parallel fashion to encourage and facilitate intercomparison. In addition, summary sheets are given for each description, and a summary table precedes each section
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