RSM, Resupply Scheduling Modeler from NASA Lewis Research Center, is a
fully menu-driven program that uses integer programming techniques to
determine an optimum schedule for replacing components on or before the
end of a fixed replacement period. Although written to analyze the
electrical power system on the Space Station Freedom, RSM is quite general
and can be used to model the resupply of almost any system subject to
user-defined resource constraints. RSM is based on a specific form of the
general linear programming problem in which all variables in the objective
function and all variables in the constraints are integers. While more
computationally intensive, integer programming was required for accuracy
when modeling systems with small quantities of components. RSM includes
user-defined constraints such as transportation mass and volume limits, as
well as component life, available repair crew time and assembly sequences.
A weighting factor allows the program to minimize factors such as cost.
The program then performs an iterative analysis, which is displayed during
the processing.

RSM, LEW-15309, is written in APL2 for IBM PC series computers and
compatibles. A stand-alone executable version of RSM is provided; however,
this is a "packed" version of RSM which can only utilize the memory within
the 640K DOS limit. This executable requires at least 640K of memory and
DOS 3 .1 or higher . Source code for an APL2/PC workspace version is also
provided. This version of RSM can make full use of any installed extended
memory but must be run with the APL2 interpreter; and it requires an 80486
based microcomputer or an 80386 based microcomputer with an 80387 math
coprocessor, at least 2Mb of extended memory, and DOS 3.3 or higher. The
standard distribution medium for this package is one 5.25 inch 360K MS-DOS
format diskette. Program $200; documentation $16.

COSMIC, The University of Georgia
382 East Broad St, Athens, GA 30602-4272
706-542-3265

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