PROCEEDINGS OF THE SECOND TROPOSPHERIC REFRACTION EFFECTS TECHNICAL REVIEW MEETING. VOLUME I. AGENDA. OPENING REMARKS AND INTRODUCTION, PAPERS BY THE AIR FORCE CAMBRIDGE RESEARCH LABORATORY THE MITRE CORPORATION THE NATIONAL BUREAU OF STANDARDS, PRESENTED AT THE MITRE CORPORATION BEDFORD, MASSACHUSETTS ON NOVEMBER 13 AND 14, 1963

1964 ◽  
Author(s):  
MITRE CORP BEDFORD MA
Keyword(s):  
Air Force ◽  
Research Laboratory ◽  
National Bureau ◽  
Technical Review ◽  
Cambridge Research ◽  
Tropospheric Refraction

scholarly journals Richard Trueswell's Contribution to Collection Evaluation and Management: A Review

2016 ◽  
Vol 11 (3) ◽  
pp. 118 ◽  
Author(s):  
Jacob L. Nash
Keyword(s):  
Air Force ◽  
Research Laboratory ◽  
Public Library ◽  
Optimal Size ◽  
Power Law Distribution ◽  
Cambridge Research ◽  
Library Users ◽  
Multiple Copies ◽  
Saving Measure ◽  
The Relationship

A Review of: Trueswell, R. L. (1969). Some behavioral patterns of library users: The 80/20 rule. Wilson Library Bulletin, 43(5), 458-461. Abstract Objective – To demonstrate the relationship between library circulation and the percent of a library's holdings satisfying circulation. Design – Retrospective cohort study of library circulation data. Setting – Cambridge and Northampton, Massachusetts, United States of America. Subjects – The users of the monographic holdings of the Air Force Cambridge Research Laboratory Library and the Forbes Public Library. Methods – Trueswell compiled circulation data from the Air Force Cambridge Research Laboratory Library over a period of 5 years, ostensibly from 1964-1969. Additionally, he gathered circulation data from Forbes Public Library. Trueswell compared each respective collection of data against the entire holdings of each library, after which he converted each measure to a percentage of the whole. Main Result – Based on the collected data, Trueswell found that the percentages of both libraries’ holdings that satisfy circulation follow a power law distribution. He compared this with a previous study measuring journal circulation at a Health Sciences Library that exhibited the same pattern. He stated that these similar distributions demonstrated the "80/20 Rule." The distribution is such that any given percent of circulation will provide the percent of a library’s circulating holdings necessary to satisfy it. Additionally, Trueswell found that 75 percent of current circulation had circulated at least once within the preceding year. Conclusion – The findings have implications for core collection development, purchasing multiple copies of a given title, determining the optimal size of a library's collection, and weeding. Trueswell also submits the idea of developing regional interlibrary loan centers for books that do not circulate often, as a cost saving measure for most libraries.

AFSIM’s pseudo-realtime hybrid simulation software design

2021 ◽  
pp. 154851292098526
Author(s):  
J Scott Thompson ◽  
Douglas D Hodson
Keyword(s):  
Air Force ◽  
Discrete Time ◽  
Software Design ◽  
Research Laboratory ◽  
Discrete Event ◽  
Hybrid Simulation ◽  
Simulation Software ◽  
Human Interaction ◽  
Virtual Simulation ◽  
Air Force Research Laboratory

Simulation approaches generally fall into two categories: discrete time or discrete event. For military modeling and simulation needs, the two approaches typically align with virtual simulation, which implies human interaction with the simulation program, and constructive simulation, which implies no human interaction. The Air Force Research Laboratory develops and distributes AFSIM (Advanced Framework for Simulation, Integration, and Modeling) to a user community that uses both virtual and constructive simulation. This paper documents the software design and primary algorithms that provide AFSIM’s support for both modes, which is termed a hybrid simulation.

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