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doi: 10.1177/003754979506500302pmid: N/A
This paper describes a SLAM II- FORTRAN simulation model of Drum- buffer-rope (DBR) as a production planning and control methodology at the engine component division of a Naval Aviation Depot. The model represents all of the functional areas of remanufacturing facility (a total of 27 shops) required for the repair/overhaul of an aviation component, as well as DBR for production planning and control. The model allows for experimentation in a variety of areas, including setting buffer sizes, buffer management techniques, input/output control, and capacity management. The model experiments indicate that DBR is an extremely robust method of production planning and control and that DBR leads to better performance to schedule, lower work-in- process inventory and improved use of present resources.
doi: 10.1177/003754979506500303pmid: N/A
Increasing the run-length of a non- terminating steady-state simulation improves confidence in the results obtained. Yet the questions need to be asked: how long should a run be and what level of confidence is obtained? This paper describes an heuristic technique for selecting the run-length which enables the user to measure the level of confidence achieved. An heuristic technique has been developed deliberately to enable implementation by both expert and non- expert users.
Hunt, Cortney S.; Foote, Bobbie L.
doi: 10.1177/003754979506500305pmid: N/A
We describe a technique developed by the authors for fast simulation of open queueing networks. The technique takes advantage of the recursive nature of departure times of customers in various parts of the system. The event calendar is circumvented using these recursive relationships whenever possible. A framework for identifying these recursive aspects of a network is presented. The technique involves identifying the servers in the system at which flows merge or diverge. Knowledge about the merge and diverge points defines the dependency relationships a specific customer has with other customers at each point in the system. The concept of a system level is based on these dependency relationships.The technique is implemented in the object oriented language SmallTalk 80. The implementation utilizes Windows interfaces and allows graphical analysis of the simulation results. The implementation is shown to achieve significant reductions in execution time compared with the traditional discrete- event approach to simulation of such networks in most cases. Several different types of systems are explored in an attempt to characterize those systems on which the technique functions well.
doi: 10.1177/003754979506500306pmid: N/A
This paper describes the creation of an intelligent software tool that performs automatic parallelization of dynamic system simulations for excecution on arbitrary message-passing multi- computing configurations. The tool greatly decreases the amount of time needed to obtain a viable multiple processor implementation of large-scale simulations and can be expanded to include the latest methodologies that exploit functional and data parallelism present within the simulation model and algorithm. Such a unifying tool is designed to increase the likelihood that a parallel realization of a simulation problem can be obtained which has an acceptable level of performance. To illustrate the feasibility of developing such a tool, this paper describes the prototype implementation of the Automated Partitioning and Mapping Engine (APME) and demonstrates its effectiveness when applied to a large-scale simulation executed on a number of multicomputer systems and topological configurations.
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