| Background and Sensitivity Simulation of a Space Based Germanium Compton Telescope |
1997 |
6 pages |
| Authors:
B. L. Graham; B. F. Phlips; J. D. Kurfess; R.A. Kroeger; GEORGE MASON UNIV FAIRFAX VA SCHOOL OF INFORMATION TECHNOLOGY AND ENGINEERING
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 | A Monte Carlo simulation code has been developed that calculates the isotopes produced by spallation and propagates the products of radioactive decays for the purpose of studying activation backgrounds in space based gamma-ray telescopes. This code has been applied to study a Compton telescope consisting of two large arrays of position sensitive germanium detectors. Activation of the germanium by cosmic rays and their secondary particles is the major source of ... |
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| A Further Note on Generalized Hyperexponential Distributions |
15 NOV 89 |
22 pages |
| Authors:
Carl M. Harris; William G. Marchal; Robert F. Botta; GEORGE MASON UNIV FAIRFAX VA SCHOOL OF INFORMATION TECHNOLOGY AND ENGINEERING
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| Many authors have used distribution functions related to the exponential staging formulation introduced by Erlang (see Brockmeyer et al., 1948), with primary modifications over the years by Jensen (1954) and Cox (1955) . Much of the current popularity of such distributions is due to the work of Neuts and colleagues on the so-called phase-type family (see, e.g., Neuts, 1975 a,b and 1981), exploiting relationships to the theory of Markov chains ... |
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| Computer Based Intelligence Support: An Integrated Expert System and Decision Support Systems Approach |
JUN 88 |
31 pages |
| Authors:
Andrew P. Sage; Adolfo Lagomasino; GEORGE MASON UNIV FAIRFAX VA SCHOOL OF INFORMATION TECHNOLOGY AND ENGINEERING
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| This research note summarizes research and design needs in the area of computer based intelligence support, particularly the command and control area. It is argued that an integrating approach is needed. A discussion of knowledge representation emphasizes this, and an approach that accommodates both probabilistic and logical support, and which is able to cope with several types of imperfect information is described. Keywords: Knowledge representation, Artificial intelligence, Cognitive science, Expert ... |
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| Aiding the Human Decisionmaker through the Knowledge-Based Sciences |
AUG 86 |
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| Authors:
Andrew P. Sage; William B. Rouse; GEORGE MASON UNIV FAIRFAX VA SCHOOL OF INFORMATION TECHNOLOGY AND ENGINEERING
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 | This article presents the central ideas (as they are seen by the authors) which were discussed during a decisionmaking and knowledge-based sciences workshop held in Northern Virginia in 1985. The workshop explored research issues, and also addressed an agenda designed to take advantage of a multi-disciplinary approach. Research having a potentially high payoff in the areas of knowledge-based support of human information processing, judgement, and choice is described. This article ... |
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