SCIENTIFIC AND TECHNICAL AEROSPACE REPORTS
A Biweekly Publication of the National Aeronautics and Space Administration
VOLUME 44, ISSUE 5 - March 10, 2006
90 ASTROPHYSICS
Includes cosmology; celestial mechanics; space plasmas; and interstellar and interplanetary gases and dust.
20060006706 Lawrence Livermore National Lab., Livermore, CA USA
Classification of Bent-Double Galaxies: Experiences with Ensembles of Decision Trees
Kamath, C.; Cantu-Paz, E.; Jan. 08, 2002; 14 pp.; In English Report No.(s): DE2005-15013560; UCRL-JC-146721; No Copyright; Avail.: Department of Energy Information Bridge
http://aero-defense.ihs.com/products/standards/webquote/aerospace.jsp?mid=W092
In earlier work, we have described our experiences with the use of decision tree classifiers to identify radio-emitting galaxies with a bent-double morphology in the FIRST astronomical survey. We now extend this work to include ensembles of decision tree classifiers, including two algoritbms developed by us. These algorithms randomize the decision at each node of the tree, and because they consider fewer candidate splitting points, are faster than other methods for creating ensembles. The experiments presented in this paper with our astronomy data show that our algorithms are competitive in accuracy, but faster than other ensemble techniques such as Boosting, Bagging, and Arcx4 with different split criteria. NTIS
Classifications; Decision Theory
20060007572 Fermi National Accelerator Lab., Batavia, IL, USA
Dark Energy Survey
Flaugher, B.; Nov. 2004; 8 pp.; In English Report No.(s): DE2005-15020295; FERMILAB-CONF-04-315-E; No Copyright; Avail.: Department of Energy Information Bridge
Dark Energy is the dominant constituent of the universe and we have little understanding of it.
We describe a new project aimed at measuring the dark energy equation of state parameter to a statistical precision of approx. 5 %, with four separate techniques. NTIS
Dark Energy; Surveys; Universe
Source: NASA
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