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Belmont, Michael R.; Lindsay-Stewart, W. Andrew; Boyle, J.D.
doi: 10.1177/003754978404200602pmid: N/A
A low-cost hybrid method is described for implementing delays and convolution integrals as part of nonlinear differential equa tions on an analogue computer. A Z80 based unit is employed for storage of data tables and kernel functions and mode con trol of the problem. The technique is illustrated using the logistic equation and its generalisation.5The results are compared with analytic approximations which are developed later in this paper.
Ratcliffe, Larry L.; Vinod, B.; Sparrow, Fredrick T.
doi: 10.1177/003754978404200603pmid: N/A
The optimal utilization and distribution of empty freight cars has plagued the railroad industry in the past and will undoubt edly continue to do so in the future. In this paper we present the methodology for a simulation-optimization model, for the movement of empty freight cars in a hypothetical railroad transportation network. The freight car network is modelled in SLAM and integrated with XMP, a sophisticated and compact linear programming software package, to determine optimal movement and prepositioning of empty cars to the various nodes (terminals) in the network.The simulation model provides the required data structure for the XMP package to execute the transportation linear program and the stochastic linear program. The model is versatile and with the aid of reliable data, could prove to be a valuable tool for railroad managers and engineers.
Neubauer, Clare Marie; Akers, Lex A.
doi: 10.1177/003754978404200604pmid: N/A
Computer-Aided Design (CAD) is gaining importance in Very Large Scale Integration (VLSI) design for three reasons: CAD reduces design time, minimizes cost, and controls complexity.This paper describes a CAD program, SPICEGEN, developed to extract a node list from a physical layout, allowing SPICE simula tion runs directly from a physical layout. SPICEGEN has been demonstrated to save Honeywell Large Computer Products Divi sion (LCPD) time at a reduced cost by identifying errors before the prototype IC's were manufactured. Furthermore, when SPICEGEN approved a layout, it was indeed correct and could be manufactured with yield the first time.SPICEGEN can be used alone or in conjunction with other available CAD tools. Although originally developed to run SPICE simulations, SPICEGEN has, as a bonus, an error report file. This file uncovers errors such as open circuits without running the SPICE simulation.
Banks, Jerry; Malavé, César O.
doi: 10.1177/003754978404200605pmid: N/A
A survey of simulation techniques used in the modeling of in ventory systems was conducted. Six categories of use were formed. Research published in each of the categories was described. Observations were drawn in cases where research was sparse or where researchers seemed to have treated an er ror improperly.
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