415 Matching Results

Search Results

Advanced search parameters have been applied.
in subjects: "Learning"  
Results: 1 - 24 next
open access

Comparison of two inductive learning methods: A case study in failed fuel identification

Description: Two inductive learning methods, the ID3 and Rg algorithms, are studied as a means for systematically and automatically constructing the knowledge base of expert systems. Both inductive learning methods are general-purpose and use information entropy as a discriminatory measure in order to group objects of a common class. ID3 constructs a knowledge base by building decision trees that discriminate objects of a data set as a function of their class. Rg constructs a knowledge base by grouping obje… more
Date: January 1, 1992
Creator: Reifman, J. (Argonne National Lab., IL (United States)) & Lee, J.C. (Michigan Univ., Ann Arbor, MI (United States). Dept. of Nuclear Engineering)
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

New Mexico High School supercomputer challenge

Description: The national need for well trained scientists and engineers is more urgent today than ever before. Scientists who are trained in advanced computational techniques and have experience with multidisciplinary scientific collaboration are needed for both research and commercial applications if the United States is to maintain its productivity and technical edge in the world market. Many capable high school students, however, lose interest in pursuing scientific academic subjects or in considering s… more
Date: January 1, 1991
Creator: Cohen, M.; Foster, M.; Kratzer, D.; Malone, P. & Solem, A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Design of Complex Systems in the presence of Large Uncertainties: a statistical approach

Description: The design or optimization of engineering systems is generally based on several assumptions related to the loading conditions, physical or mechanical properties, environmental effects, initial or boundary conditions etc. The effect of those assumptions to the optimum design or the design finally adopted is generally unknown particularly in large, complex systems. A rational recourse would be to cast the problem in a probabilistic framework which accounts for the various uncertainties but also a… more
Date: July 31, 2007
Creator: Koutsourelakis, P
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Adaptive Dynamic Bayesian Networks

Description: A discrete-time Markov process can be compactly modeled as a dynamic Bayesian network (DBN)--a graphical model with nodes representing random variables and directed edges indicating causality between variables. Each node has a probability distribution, conditional on the variables represented by the parent nodes. A DBN's graphical structure encodes fixed conditional dependencies between variables. But in real-world systems, conditional dependencies between variables may be unknown a priori or m… more
Date: October 26, 2007
Creator: Ng, B M
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

BUILDING A NETWORK FOR NEUTRON SCATTERING EDUCATION

Description: In a concerted effort supported by the National Science Foundation, the Department of Commerce, and the Department of Energy, the United States is rebuilding its leadership in neutron scattering capability through a significant investment in U.S. neutron scattering user facilities and related instrumentation. These unique facilities provide opportunities in neutron scattering to a broad community of researchers from academic institutions, federal laboratories, and industry. However, neutron sca… more
Date: October 1, 2008
Creator: Pynn, Roger; Baker, Shenda Mary; Louca, Despo A; McGreevy, Robert L; Ekkebus, Allen E; Kszos, Lynn A et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Sunfall: a collaborative visual analytics system for astrophysics

Description: Computational and experimental sciences produce and collect ever-larger and complex datasets, often in large-scale, multi-institution projects. The inability to gain insight into complex scientific phenomena using current software tools is a bottleneck facing virtually all endeavors of science. In this paper, we introduce Sunfall, a collaborative visual analytics system developed for the Nearby Supernova Factory, an international astrophysics experiment and the largest data volume supernova sea… more
Date: July 7, 2008
Creator: Aragon, Cecilia R.; Aragon, Cecilia R.; Bailey, Stephen J.; Poon, Sarah; Runge, Karl & Thomas, Rollin C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Trip report for field visit to Fayetteville Shale gas wells.

Description: This report describes a visit to several gas well sites in the Fayetteville Shale on August 9, 2007. I met with George Sheffer, Desoto Field Manager for SEECO, Inc. (a large gas producer in Arkansas). We talked in his Conway, Arkansas, office for an hour and a half about the processes and technologies that SEECO uses. We then drove into the field to some of SEECO's properties to see first-hand what the well sites looked like. In 2006, the U.S. Department of Energy's (DOE's) National Energy Tech… more
Date: September 30, 2007
Creator: Veil, J. A. & Division, Environmental Science
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Special Nuclear Material Portal Monitoring at the Nevada Test Site

Description: In the past, acceptance and performance testing of the various Special Nuclear Material (SNM) monitoring devices at the Nevada Test Site has been performed by the Radiological Health Instrumentation Department. Calibration and performance tests on the PM-700 personnel portal monitor were performed but there was no test program for the VM-250 vehicle portal monitor because it had never been put into service. The handheld SNM monitors, the TSA model 470B, were being calibrated annually, but there… more
Date: March 1, 2008
Creator: Murphy, Mike
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Design and Analysis of Salmonid Tagging Studies in the Columbia Basin. Volume III, Experiment Designs and Statistical Models to Estimate the Effect of Transportation on Survival of Columbia River System Salmonids.

Description: Experiment designs to estimate the effect of transportation on survival and return rates of Columbia River system salmonids are discussed along with statistical modeling techniques. Besides transportation, river flow and dam spill are necessary components in the design and analysis, otherwise questions as to the effects of reservoir drawdowns and increased dam spill may never be satisfactorily answered. Four criteria for comparing different experiment designs are: (1) feasibility; (2) clarity o… more
Date: June 1, 1997
Creator: Newman, Ken
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Learning algorithms for stack filter classifiers

Description: Stack Filters define a large class of increasing filter that is used widely in image and signal processing. The motivations for using an increasing filter instead of an unconstrained filter have been described as: (1) fast and efficient implementation, (2) the relationship to mathematical morphology and (3) more precise estimation with finite sample data. This last motivation is related to methods developed in machine learning and the relationship was explored in an earlier paper. In this paper… more
Date: January 1, 2009
Creator: Porter, Reid B; Hush, Don & Zimmer, Beate G
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Neural network based approach for tuning of SNS feedback and feedforward controllers.

Description: The primary controllers in the SNS low level RF system are proportional-integral (PI) feedback controllers. To obtain the best performance of the linac control systems, approximately 91 individual PI controller gains should be optimally tuned. Tuning is time consuming and requires automation. In this paper, a neural network is used for the controller gain tuning. A neural network can approximate any continuous mapping through learning. In a sense, the cavity loop PI controller is a continuous m… more
Date: January 1, 2002
Creator: Kwon, S. I. (Sung-Il); Prokop, M. S. (Mark S.) & Regan, A. H. (Amy H.)
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Gulf of Mexico Regional Collaborative Final Report

Description: This report presents the results of the Gulf of Mexico Regional Collaborative (GoMRC), a year-long project funded by NASA. The GoMRC project was organized around end user outreach activities, a science applications team, and a team for information technology (IT) development. Key outcomes are summarized below for each of these areas. End User Outreach  Successfully engaged federal and state end users in project planning and feedback  With end user input, defined needs and system functional re… more
Date: December 1, 2007
Creator: Judd, Kathleen S.; Judd, Chaeli; Engel-Cox, Jill A.; Gulbransen, Thomas; Anderson, Michael G.; Woodruff, Dana L. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Scientist-Teacher Partnerships as Professional Development: An Action Research Study

Description: SUBMITTED AS A DOCTORAL DISSERTATION IN COMPLETION OF REQUIREMENTS FOR THE DEGREE OF ED.D THROUGH WASHINGTON STATE UNIVERSITY. The overall purpose of this action research study was to explore the experiences of ten middle school science teachers involved in a three-year partnership program between scientists and teachers at a Department of Energy national laboratory, including the impact of the program on their professional development, and to improve the partnership program by developing a set… more
Date: April 17, 2009
Creator: Willcuts, Meredith H.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
open access

Neurons with hysteresis from a network that can learn without any changes in synaptic connection strengths

Description: A neural network concept derived from an analogy between the immune system and the central nervous system is outlined. The theory is based on a neuron that is slightly more complicated than the conventional McCullogh-Pitts type of neuron, in that is exhibits hysteresis at the single cell level. This added complication is compensated by the fact that a network of such neurons is able to learn without the necessity for any changes in synaptic connection strengths. The learning occurs as a neural … more
Date: January 1, 1986
Creator: Hoffmann, G. W. & Benson, M. W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Investigation of learning and experience curves

Description: The applicability of learning and experience curves for predicting future costs of solar technologies is assessed, and the major test case is the production economics of heliostats. Alternative methods for estimating cost reductions in systems manufacture are discussed, and procedures for using learning and experience curves to predict costs are outlined. Because adequate production data often do not exist, production histories of analogous products/processes are analyzed and learning and aggre… more
Date: April 1, 1980
Creator: Krawiec, F.; Thornton, J. & Edesess, M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

N-learners problem: Learning Boolean combinations of halfspaces

Description: Given two subsets S{sub 1} and S{sub 2} (not necessarily finite) of {Re}{sup d} separable by a Boolean combination of N halfspaces, we consider the problem of learning the separation function from a finite set of examples, i.e. we produce with high probability a function close to the actual separating function. Our solution consists of a system of N perceptrons and a single consolidator which combines the outputs of the individual perceptrons. We show that an off-line version of this problem, w… more
Date: March 1, 1992
Creator: Rao, N.S.V. (Old Dominion Univ., Norfolk, VA (United States). Dept. of Computer Science); Oblow, E.M. & Glover, C.W. (Oak Ridge National Lab., TN (United States))
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Evaluation of injury/illness recordkeeping pilot course taught in Richland, Washington, January 15, 1992

Description: This section summarizes trainee evaluations for the Safety Training Section course, Injury/Illness Recordkeeping which was conducted January 15, at Hanford, in Richland Washington. This class was the first pilot course taught. This class was designed to acquaint attendees with DOE orders 5484.1, 5484.1A, draft 3 and the OSHA regulations found in 29 CFR 1904. This goal was partially achieved; the section pertaining to DOE orders must be improve prior to the next pilot class. Section 1.1 and 1.2 … more
Date: March 1, 1992
Creator: Wright, T. S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Learning Demonstration Progress Report -- September 2007

Description: This report documents the key results from the DOE Controlled Hydrogen Fleet and Infrastructure Validation and Demonstration project. This project is also referred to as the fuel cell vehicle and infrastructure learning demonstration.
Date: November 1, 2007
Creator: Wipke, K.; Sprik, S.; Kurtz, J. & Thomas, H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Climate change effects on international stability : a white paper.

Description: This white paper represents a summary of work intended to lay the foundation for development of a climatological/agent model of climate-induced conflict. The paper combines several loosely-coupled efforts and is the final report for a four-month late-start Laboratory Directed Research and Development (LDRD) project funded by the Advanced Concepts Group (ACG). The project involved contributions by many participants having diverse areas of expertise, with the common goal of learning how to tie to… more
Date: December 1, 2004
Creator: Murphy, Kathryn; Taylor, Mark A.; Fujii, Joy; Malczynski, Leonard A.; McNamara, Laura A.; Reinert, Rhonda K. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Changing Adventures of Mixed Low-Level Waste Disposal at the Nevada Test Site

Description: After a 15-year hiatus, the United States Department of Energy (DOE) National Nuclear Security Administration Nevada Site Office (NNSA/NSO) began accepting DOE off-site generated mixed low-level radioactive waste (MLLW) for disposal at the Nevada Test Site (NTS) in December 2005. This action was predicated on the acceptance by the Nevada Division of Environmental Protection (NDEP) of a waste analysis plan (WAP). The NNSA/NSO agreed to limit mixed waste disposal to 20,000 cubic meters (approxima… more
Date: February 1, 2007
Creator: Pyles, Gary & Carilli, Jhon
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
Back to Top of Screen