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Methodology范文-dissertation Methodology范例-Features of the Sys

Methodology范文-dissertation Methodology范例 Features of the System Engineering Process Activities (SEPA)
K. Suzanne Barber, Thomas J. Graser,
Stephen R. Jernigan, and Brian J. McGiverin
The Laboratory for Intelligent Processes and Systems
The University of Texas at Austin
Austin, TX 78712
The presence of software systems within the manufacturing enterpriseis significant and growing. The cost and complexity of softwarecomponents must be controlled to maintain competitive operations.SEPA is a design methodology that creates traceable, comprehensible,and extensible component-based system design specifications based onrequirements from system clients and domain experts. Through theapplication of Artificial Intelligence techniques, the SEPA tool suitepresents itself as a unique tool offering among software developmenttools.
1. Motivation
The presence of software systems within themanufacturing enterprise is significant and growing.Software is integral to factory floor operations: from
inventory management systems, production planning andscheduling systems to shop and machine control.
According to Gary Gettel, Director of Factory Integrationat Sematech, software continues to play an ever-increasingrole in manufacturing:
Software content in equipment is growing by morethan 25% per year. To prevent this increasedamount of software complexity from derailingeffective factory operation, more reliable,predictable fail-safe software will be required.Higher utilization of commercial software subsystems,greater maturity of the industry’ssoftware development capability and reducedsoftware customization through more configurablearchitectures will be needed. (Gettel 1998)
The cost of installing and customizing commercial-offthe-shelf (COTS) software, developing in-house softwaresystems, and integrating new software systems withexisting systems can be enormous. In semiconductormanufacturing, for example, the cost of integration is often3-10 times the basic cost of the manufacturing systemproduct (Weber 1998).
The difficulty achieving manufacturing componentintegration is influenced by a number of factors, includingever-increasing process/factory complexity and the
Copyright © 1998, American Association for Artificial Intelligence
(www.aaai.org). All rights reserved.interaction of multiple perspectives (e.g. technology,business, personal) (Weber 1998). Furthermore, it isdeceptively easy to underestimate the cost of softwaremaintenance when planning a software budget. An oftencited study by Schach places maintenance at 67% of totallifecycle costs, while the requirements and specificationphases account for only 7% (Schach 1990). The premiseof the research described in this paper is: Investment in
formal, repeatable requirements analysis and verificationwill reap rewards in later phases in the lifecycle,specifically reduction in maintenance costs and support forintegration of system components.

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