Research for Computer Models
July 1, 1978
The Navy currently procures unrestricted line officers through nine sources which differ widely in their costs and returns. In this paper, we construct a linear programming model that solves for the optimal number of accessions from each source. Life-cycle costs are minimized subject to the constraint that, for each URL designation, the required number of officers at each rank is met. The inputs to the model include the present value of costs, the initial distribution of officers across designations, retention, promotion success, and requirements. The study finds that six of the nine officer accession programs consistently enter the optimal accession program mix. The need for individual programs is linked with certain Navy requirements. The study concludes with three recommendations that should reduce Navy manpower costs.
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December 1, 1977
A library or information center satisfies user needs for a periodical by either maintaining the publication in its own collection or borrowing it from other libraries. At low levels of use, borrowing is the less costly alternative, while at high levels of use owning is the less costly alternative. At an intermediate level of use, called the crossover point, owning and borrowing are equally costly. Crossover points have been estimated as a function of subscription and borrowing costs using cost data from three research libraries and usage characteristics representing collections in either science and technology or humanities and social sciences. These results were estimated by means of a cost model written in APL which can be made available upon request.
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November 1, 1977
This report examines a general method to estimate the correlation of variables in a large, diverse population from a smaller, selected population in which the ranges of the variables have been restricted. All correlation coefficients are corrected simultaneously, so that an entire correlation matrix can be corrected. Alternate methods are compared. The effectiveness of the method is tested, and an example is given.
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July 1, 1977
This paper presents a methodology for quantifying the operational effects of the seakeeping characteristics of ships and documents the computer program developed for this purpose. Potential modifications that can be applied to the program are also discussed.
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June 1, 1977
This paper presents a FORTRAN language radar detection model that determines the signal-to-noise (S/N) ratio as a function of target range. The model determines S/N ratios in a clear or noise jamming environment. The jamming may be created by a self-screening or standoff jammer operating against the radar in the main-lobe and/or side-lobe. The threats may have an ascending, level, or descending flight profile. The effects of atmospheric attenuation, weather clutter, sea state, surface clutter, and multipath may also be considered.
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May 1, 1977
A model is described for projecting inventories of enlisted naval personnel expected to result from management policy aimed at controlling the size and experience mix of the inventory. The effects of policy changes are modeled as changes in flow probabilities into and through an inventory partitioned along dimensions of experience level (length of service) and time until end of obligated service. An example is presented which illustrates several innovative features of the model which lead to an improved planning capability. Continuing efforts to improve the model are discussed.
May 1, 1977
This paper presents a model for the determination of an efficient allocation of annual enlisted personnel accessions to Navy ratings which meets the demand for each rating in each of the next seven years.
April 1, 1976
Estimating character error rate by comparing send and receive character streams is described and evaluated.
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April 1, 1975
GLOBALL manipulates several smaller computer programs to calculate global ranges and surface areas. GLOBEMAP provides a three-dimensional map background upon which the ranges and areas may be presented. This paper is not intended to be a user's manual but to describe characteristics of these models and possible applications of them.
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