Research for Computer Programs

This paper describes an inventory system in which demands for spare parts arise due to part failure. Successive demands are assumed to be independent and identically distributed random variables. The model considers the perdiodic review of a single part with backlogging of demand.

A computer program written in FORTRAN which allows the facility of free-format data input is described. Flow charts and a listing of the program are included.

The CNA 50 Nuclear Exchange Model is a war game model based on the CODE 50 Model produced by the Lambda Corporation. It permits a 3-strike exchange between 2 opponents. Each of the first 2 strikes may be either counterforce, countervalue, or a mixture of counterforce and countervalue, as desired. The third strike is always a countervalue strike. The assignment of weapons to targets in each strike is made in an inner calculation, using a Lagrange multiplier method. The calculation procedure for CNA 50 is presented as the step by step logical sequence of equations and operations that are necessary to control the data and to calculate the desired parameters. Flow charts and a listing of the associated computer program are included. See also CRC 128 & CRC 132.

The Officer Projection Model (OPM) projects the flow of officers through the ranks of the U.S. Navy. It projects an initial officer inventory (characterized by length of service, grade, and promotion status) in yearly increments, accounting for attrition, promotion, legal constraints (Title 10 of the U.S. Code), and such management policies as minimum accession requirements and end strength targets. It is devoted especially to simulating the Navy's officer promotion system, and provides several options which consider the interactions of flow point, promotion rate, zone size, grade structure and end strength, and early and late selection. The OPM will also compute annual compensation, separation pay, retirement pay, and the present value of retirement pay for the remaining life expectancy of projected retirees. The model provides management with a tool for evaluating alternative promotion policies and retirement proposals, and for studying the interactions of officer end strengths, promotions, and accessions, and the cost of changes in longevity and grade structure. The Guide for Users, Volume I, describes the Navy's officer system and the model and discusses the data and policy variables to be specified by the user. The Guide for Programmers, Volume II, provides a detailed explanation of the computer coding as an aid to changing, and making special adaptations of the model.