A 3/2 Algorithm for Two-Machine Open Shop with by Strusevich V. A., Van de Waart A. J. A., Dekker R.
By Strusevich V. A., Van de Waart A. J. A., Dekker R.
Summary. This paper considers the matter of minimizing the agenda size of a two-machine store within which notonly can a role be assigned any of the 2 attainable routes, but in addition the processing instances rely on the selected route.This challenge is understood to be NP-hard. We describe an easy approximation set of rules that promises a worst-caseperformance ratio of two. We additionally current a few differences to this set of rules that increase its functionality andguarantee a worst-case functionality ratio of 3=2.
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Extra info for A 3/2 Algorithm for Two-Machine Open Shop with Route-Dependent Processing Times
The calling program interacts with objects through the use of message handlers (member functions in the case of C++). This interface allows objects to be changed without the need to modify the application program in which the objects are used. This is particularly useful in situations where objects are changing or evolving, as is usually the case in the CAPP domain. Object-oriented programming has been integrated into expert system shells. CLIPS™ (C Language Integrated Production System* (Giarrantano and Riley, 1989) is an example of this.
The system can be extended by the end-user or a third-party software developer. • The system can be used by many different types of end-users. • Utilizes human expertise and computer efficiency in correct proportions. • Promotes synthesis and analysis in addition to automation and simulation. • Easy to implement and maintain. • Easy to use. • Allows the expertise of the end-user to be incorporated into the system. • The system can act as an archiving tool for the end-user’s expertise. • The system can be used to train new process planners.
We have presented some of the key enablers and characteristics of CAPP systems. We also have discussed research in feature recognition, which is one of the key underlying technologies of CAPP. Despite the efforts outlined, and extensions to new CAPP domains, fewer commercially viable CAPP systems are available than CAD or CAM systems. This is in large part due to the complexity of interpreting CAD models of complex engineered products and the difficulties in identifying and capturing machining practices that are customized to the end-user’s requirements.