Oil Stockpiles and Import Reductions: A Dynamic Programming Approach
Article Abstract:
Oil stockpiling policies are analyzed using models. United States policy choices are restricted to two instruments-stockpiles and disruption tariffs. The model considers the influence of United States import demands on the OPEC price for oil. It also includes the duration and severity of oil disruptions by OPEC nations. The model is based upon a probabilistic view of disruptions analyzed by applying dynamic programming. A block diagram shows the information flows to the stockpile model. A graph shows the economic costs associated with import shortages. Another graph shows how the United States oil import price reaction function was derived from the residual supply in the world oil market. A disruption probability transition matrix is included as are tables and graphs showing results of four case studies.
Publication Name: Operations Research
Subject: Petroleum, energy and mining industries
ISSN: 0030-364X
Year: 1983
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Solving Large-Scale Zero-One Linear Programming Problems
Article Abstract:
It has been conceded by operations research practitioneers that large-scale zero-one linear programming problems are not amenable to solutions by exact methods. Ten such problems have been solved. Some have had up to 2750 zero-one variables. All problems are characterized by sparse constraint matrices with rational data. About half had no special structure and the others' structure was not exploited. An IBM linear programming software system MPSX-370 and the branch-and-bound integer programming package MIP-370 were used although any commercial package could have been used. The experimental package PIPX used MPSX-370 and MIP-370. It includes automatic problem preprocessing and constraint generation. A flow chart is included. Tables contain numerical results.
Publication Name: Operations Research
Subject: Petroleum, energy and mining industries
ISSN: 0030-364X
Year: 1983
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A Mathematical Programming Model for the Location of Access Controls in a Distributed Data Base Environment
Article Abstract:
Most data base design research has concentrated on centralized data bases, rather than distributed data bases. Security of access has dealt with particular computers or data base systems. Access security for distributed data bases is presented. A model is developed that follows restricted access design methodology. Experimental results concentrate on reducing the data transfer load of the communication network. A flow chart of the model for detailed access with security and another with simplified access is included. A comparison of the models is made.
Publication Name: Operations Research
Subject: Petroleum, energy and mining industries
ISSN: 0030-364X
Year: 1984
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