NASA Scientific and Technical Aerospace Reports

have successfully implemented this general strategy in two different network layers: a layer-7 HTTP redirector and a layer-4
packet redirector, which redirect connection requests from distributed clients to a cluster of distributed servers. Our
measurements of both implementations verify that our approach is general and effective: different client groups receive service
commensurate with their agreements.
DTIC
Computer Programming; Computers; Software Engineering
20060001927 Dartmouth Coll., Hanover, NH USA
Economic Markets as a Means of Open Mobile-Agent Systems
Bredin, Jonathan; Kotz, David; Rus, Daniela; May 1, 1999; 8 pp.; In English
Contract(s)/Grant(s): N00014-95-1-1204; F49620-97-1-0382
Report No.(s): AD-A440603; No Copyright; Avail.: Defense Technical Information Center (DTIC)
Mobile-agent systems have gained popularity in use because they ease the application design process by giving software
engineers greater flexibility. Although the value of any network is dependent on both the number of users and the number of
sites participating in the network, there is little motivation for systems to donate resources to arbitrary agents. We propose to
remedy the problem by imposing an economic market on mobile-agent systems where agents purchase resources from host
sites and sell services to users and other agents. Host sites accumulate revenues, which are distributed to users to be used to
launch more agents. We argue for the use of markets to regulate mobile-agent systems and discuss open issues in implementing
market-based mobile-agent systems.
DTIC
Computer Programs; Economics; Market Research; Marketing
20060002030 Geological Survey, Washington, DC USA
The National Water-Quality Assessment Program Invertebrate Data Analysis System (IDAS) Software: Version 3
(User’s Manual)
Cuffney, Thomas F.; Jan. 1, 2003; 115 pp.; In English
Report No.(s): AD-A440224; USGS-03-172; No Copyright; Avail.: Defense Technical Information Center (DTIC)
The Invertebrate Data Analysis System (IDAS) software provides an accurate, consistent, and efficient mechanism for
analyzing invertebrate data collected as part of the National Water-Quality Assessment Program and stored in the Biological
Transactional Database (Bio-TDB). The IDAS software is a stand-alone program for personal computers that run Microsoft
(MS) Windows . It allows users to read data downloaded from Bio-TDB and stored either as MS Excel or MS Access files.
The program consists of five modules. The Edit Data module allows the user to subset, combine, delete, and summarize
community data. The Data Preparation module allows the user to select the type(s) of sample(s) to process, calculate densities,
delete taxa based on laboratory processing notes, combine lifestages or keep them separate, select a lowest taxonomic level
for analysis, delete rare taxa, and resolve taxonomic ambiguities. The Calculate Community Metrics module allows the user
to calculate over 130 community metrics, including metrics based on organism tolerances and functional feeding groups. The
Calculate Diversities and Similarities module allows the user to calculate nine diversity and eight similarity indices. The Data
export module allows the user to export data to other software packages and produce tables of community data that can be
imported into spreadsheet and word-processing programs. Though the IDAS program was developed to process invertebrate
data downloaded from USGS databases, it will work with other data sets that are converted to the USGS (Bio-TDB) format.
Consequently, the data manipulation, analysis, and export procedures provided by the IDAS program can be used by anyone
involved in using benthic macroinvertebrates in applied or basic research.
DTIC
Computer Programs; Data Processing; Invertebrates; User Manuals (Computer Programs); Water Quality
20060002035 National War Coll., Washington, DC USA
In Pursuit of Automated Command and Control: The Army vs. OSD
Sielski, Timothy J.; Jan. 1, 1994; 12 pp.; In English
Report No.(s): AD-A440546; No Copyright; Avail.: CASI: A03, Hardcopy
The US Army has been trying to automate its tactical command and control process since the beginning of the last decade.
Pursuit of this goal took the form of an acquisition program for the development and fielding of an integrated
hardware/software system designed to meet the requirements of deployed tactical units. Known as the Maneuver Control
System, or MCS, this automated system, has yet to be fielded in any useful form to Army units after over 10 years of
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