| Conditional Reliability and the Identification of Communities |
09-Nov-2009 |
7 pages |
| Authors:
Charles J Colbourn; Violet R Syrotiuk; ARIZONA STATE UNIV TEMPE
|
 | This document reports on results obtained in the investigation of a collection of methods for using indirect measurements of usage patterns in communication networks with the goal of identifying communities of users. The primary methods developed include a generalization of connectivity-based network reliability measures to multiterminal resilience measures that permit a more detailed classification of types of communication; techniques for identifying indirect connections based on patterns of common usage rather ... |
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| Bubble Clustering in the Ocean and Acoustic Implications |
Nov-2009 |
5 pages |
| Authors:
Thomas C Weber; NEW HAMPSHIRE UNIV DURHAM CENTER FOR COASTAL AND OCEAN MAPPING (CCOM)
|
| This research is intended to further the understanding of how high-frequency acoustic fields interact with bubble clouds in highly dynamic environments (e.g., in ship wakes or near the ocean surface). The results of this type of research can be used to help refine high frequency sonar performance models, to select optimal sonar frequencies, and to refine detection and classification routines. The results of this research can also be used to ... |
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| Geo-Based Inter-Domain Routing (GIDR) Protocol for MANETS |
Oct-2009 |
8 pages |
| Authors:
Mario Gerla; Abhishek Tiwari; Biao Zhou; Konglin Zhu; You Lu; Anurag Ganguli; Bao-hong Shen; David Krzysiak; UTOPIA COMPRESSION CORP LOS ANGELES CA
|
| Inter-domain routing for MANETs (Mobile Ad Hoc Networks) draws increasing attention because of military and vehicular applications. The existing Border Gateway Protocol (BGP) is the de facto inter-domain routing protocol for the Internet. But BGP is not applicable to MANETs because the BGP design is based on a static Internet which does not support dynamic discovery of members, and cannot scale to mobile, dynamic topology environments. The proposed geo-based inter-domain ... |
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| Source and Path Calibration in Regions of Poor Crustal Propagation using Temporary, Large-Aperture, High-Resolution Seismic Arrays |
30-Sep-2009 |
9 pages |
| Authors:
John L Nabelek; Jochen Braunmiller; W S Phillips; OREGON STATE UNIV CORVALLIS
|
| Broadband seismic data acquired during the Hi-CLIMB field experiment are used to study seismic events and path propagation in the Nepal Himalaya and south-central Tibetan Plateau. Similarities in regional propagation between Tibet and Iran motivate this new study. The 2002-2005 Hi-CLIMB experiment consisted of 233 stations distributed along a dense 800 km linear north-south array extending from the Himalayan foreland into the central Tibetan Plateau. The main array was flanked ... |
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| A Stepwise, Iterative Procedure to Constrain Stress Drop, Regional Attenuation Models, and Site Effects |
30-Sep-2009 |
11 pages |
| Authors:
W S Phillips; Mark D Fisk; ALLIANT TECHSYSTEMS INC SAN DIEGO CA
|
| Accurate corrections for distance, source size, and site effects are needed for reliable use of regional seismic phases for discrimination and magnitude estimation. Procedures that simultaneously invert for attenuation, geometrical spreading, site, and source parameters have been shown to include many trade-offs and instabilities that have led to significantly inaccurate corrections for distance and source terms. Under previous work, we developed and applied an approach to constrain source parameters, including ... |
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| Value-Centric Design Methodologies for Fractionated Spacecraft: Progress Summary from Phase 1 of the DARPA System F6 Program |
Sep-2009 |
15 pages |
| Authors:
Paul Eremenko; Owen C Brown; Paul D Collopy; DEFENSE ADVANCED RESEARCH PROJECTS AGENCY ARLINGTON VA
|
| One of the most ambitious efforts in value-centric design of a military aerospace system undertaken to date has been the parallel development by four performer teams, headlined by major space industry primes, of design tools for fractionated space architectures under DARPA's System F6 program. The goal of the System F6 program is to replace traditional, highly-integrated, monolithic satellites with wirelessly-networked clusters of heterogeneous modules incorporating the various payload and infrastructure ... |
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| Design of Scalable Receivers for Low Probability of Detection Communications Systems |
Sep-2009 |
83 pages |
| Authors:
Cowan; Frank R IV; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Conventional approaches for a distributed low probability of detection communications system with a large number of unique transmitters and a single or a few receivers, require receiver complexity proportional to the number of transmitters. To improve efficiency in terms of receiver complexity, two alternative designs are analyzed and compared to a reference receiver, whose complexity grows linearly as the number of transmitters increases. The first alternative system groups the transmitters ... |
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| Understanding the Biosynthesis SF2575: A Potent Antitumor Compound With Novel Modes of Action |
Sep-2009 |
|
| Authors:
Yi Tang; CALIFORNIA UNIV LOS ANGELES
|
 | SF2575 is a tetracycline polyketide produced by Streptomyces sp. SF2575 and displays exceptionally potent anticancer activity. The structure is chemically complex and contains unusual angelate and salicylate tailoring groups. In this study, we identified, sequenced and functionally analyzed the ssf biosynthetic gene cluster. Intermediates were isolated from the SF2575 culture extract to suggest the order of pendant groups addition is C-9 glycosylation, C-4 salicylation and C-4' angelycylation. Cytotoxicity studies demonstrated ... |
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| Software Performance Modeling in PC Clusters |
24-Jul-2009 |
20 pages |
| Authors:
Wolfgang Baer; Steve Decato; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Execution of course grain parallel programs in PC clusters promises super-computer performance in low cost hardware environments. However the overhead associated with data distribution, synchronization, and peripheral access can easily eliminate any performance gain promised by the individual cluster capacity. Application specific system performance analysis is required both to engineer PC cluster hardware and evaluate the cost effectiveness of parallelizing software components. This paper presents a distributed system performance model ... |
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| Calibration of an Orthogonal Cluster of Magnetic Sensors |
Jul-2009 |
34 pages |
| Authors:
Andrew A Thompson; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
|
| This report interprets least-squares estimation as a magnetic sensor calibration procedure. The procedure demonstrated can be applied to any inner product type of sensor element to calibrate a single sensor or multisensor unit. The accuracy of the estimates can be quantified. In addition to scale factor and bias, the within-unit alignment and the alignment to a given coordinate system can be estimated. |
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| First-Principles Monte-Carlo Simulation of Homogeneous Condensation in Atomic and Molecular Plumes |
Jun-2009 |
17 pages |
| Authors:
Sergey Gimelshein; Ingrid Wysong; Ryan Jansen; Michael Zeifman; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE
|
| First-principles kinetic theory is used in this work to analyze non-equilibrium homogeneous condensation of argon and water. The present model uses a recombination-reaction energy-dependent mechanism of the DSMC method for the dimer formation, and RRK model for the evaporation. Three-step validation of the model is conducted, (i) comparison of clusterization rates in an equilibrium heat bath with theoretical predictions, (ii) comparison of the argon dimer fractions in an orifice expansion ... |
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| Accuracy Analysis for Kinetic Modeling of Homogeneous Condensation in Plumes |
Jun-2009 |
6 pages |
| Authors:
Sergey Gimelshein; Deborah Levin; Ingrid Wysong; Ryan Jansen; Michael Zeifman; Zheng Li; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE
|
| Two different approaches for modeling the clustering in rapidly expanding plumes have been reported in the literature. The first approach, known as the classical approach, takes its starting point from the classical nucleation theory (CNT) which is based on equilibrium thermodynamics. The second one, known as the kinetic approach, treats nucleation as the process of kinetic chemical aggregation. The first, macroscopic, approach, while being useful and found to be applicable ... |
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| Programming Methodology for High Performance Applications on Tiled Architectures |
Jun-2009 |
431 pages |
| Authors:
Mark A Richards; Daniel P Campbell; GEORGIA INST OF TECH ATLANTA
|
| The core activity of the original Polymorphous Computing Architectures (PCA) program was to advance the design and implementation of several emerging academic multiprocessor-on-a-chip architecture projects (chip multiprocessors, or CMPs). The Georgia Tech team's primary role in the PCA program was to facilitate definitions and implementation of the Morphware Stable Interface (MSI), application software development architecture intended to be portable across PCA architectures, offer high development productivity, and maintain high performance ... |
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| Forward Sound Propagation Around Seamounts: Application of Acoustic Models to the Kermit-Roosevelt and Elvis Seamounts |
Jun-2009 |
279 pages |
| Authors:
Hyun J Kim; MASSACHUSETTS INST OF TECH CAMBRIDGE JOINT PROGRAM IN APPLIED OCEAN SCIENCE AND ENGINEERING
|
| The Basin Acoustic Seamount Scattering Experiment (BASSEX) of 2004 was conducted to measure forward-scattering around the Kermit-Roosevelt Seamount Complex in the Northeast Pacific. The BASSEX experiment was focused on the bathymetric effects on acoustic propagation, in particular, on direct blockage, horizontal refraction, diffraction, and scattering by the seamounts. A towed hydrophone array, with 64 sensors cut for 250Hz (3m spacing), was used to measure the signals transmitted from the aforementioned ... |
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| Design of Energetic Ionic Liquids |
12-May-2009 |
9 pages |
| Authors:
Sharon Hammes-Schiffer; Jerry A Boatz; Mark S Gordon; Gregory A Voth; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE
|
| An essential need of the US Air Force is the discovery, development, and fielding of new, energetic materials for advanced chemical propulsion in space and missile applications. Some of the key factors driving the requirement for new chemical propellants include: (a) improved performance in terms of increased specific impulse and density, (b) reduced sensitivity to external stimuli such as impact, friction, shock, and electrostatic discharge, and (c) mitigation of environmental ... |
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| Inhibition of Rac GTPases in the Therapy of Chronic Myelogenous Leukemia |
Apr-2009 |
56 pages |
| Authors:
Jose Cancelas; CHILDREN'S HOSPITAL MEDICAL CENTER CINCINNATI OH
|
| Chronic myelogenous leukemia (CML) is a clonal myeloproliferative disease (MPD) characterized by the expression of the p210-BCR/ABL fusion gene [1]. This gene is produced by the reciprocal translocation (9; 22) (q34; q11) that juxtaposes the 3end of Abelson leukemia virus (ABL) gene with the 5' end of the breakpoint cluster region (Bcr) gene on chromosome 22. The transcript formed as a result encodes for the BCR/ABL fusion protein with constitutively ... |
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| Robust Sensitivity Analysis for the Joint Improvised Explosive Device Defeat Organization (JIEDDO) Proposal Selection Model |
Mar-2009 |
135 pages |
| Authors:
Christina J Willy; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
|
| Throughout Operations Iraqi Freedom and Enduring Freedom, the Department of Defense (DoD) faced challenges not experienced in its previous military operations. The enemy's unwavering dedication to the use of improvised explosive devices (IEDs) against the coalition forces continues to challenge the day-to-day operations of the current war. The Joint Improvised Explosive Device Defeat Organization's (JIEDDO) proposal solicitation process enables military and nonmilitary organizations to request funding for the development of ... |
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| Dynamic Interactions for Network Visualization and Simulation |
Mar-2009 |
111 pages |
| Authors:
Cigdem Yetisti; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
|
| This research effort examines related interface studies, interactive techniques and visualization functions to present the design, development and implementation of a new network visualization framework design. From the interface design perspective, this research presents a prototype design to ease the implementation process. The prototype design is introduced to attempt to better facilitate using multiple network visualization functions meeting user needs. With the usage of the mediator tool, the new network ... |
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| Upgrading of Existing X-Ray Photoelectron Spectrometer Capabilities for Development and Analysis of Novel Energetic NanoCluster Materials (DURIP) |
Mar-2009 |
7 pages |
| Authors:
David L Allara; PENNSYLVANIA STATE UNIV UNIVERSITY PARK
|
| This DURIP proposal was funded to upgrade an existing Kratos Ultra Axis X-ray Photoelectron Spectrometer (XPS) in the Penn State Materials Characterization Laboratory Facility as the primary objective along with an existing RHK, ultrahigh vacuum atomic force microscope (AFM) in the Allara lab as the secondary objective. These acquisitions allow new capabilities for performing experiments directed at synthesizing novel types of discrete heteroatom clusters by highly controlled vapor deposition and ... |
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| Exploitation of Intra-Spectral Band Correlation for Rapid Feature Selection, and Target Identification in Hyperspectral Imagery |
Mar-2009 |
190 pages |
| Authors:
Michael K Miller; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| This research extends the work produced by Capt. Robert Johnson for detecting target pixels within hyperspectral imagery (HSI). The methodology replaces Principle Components Analysis for dimensionality reduction with a clustering algorithm which seeks to associate spectral rather than spatial dimensions. By seeking similar spectral dimensions, the assumption of no a priori knowledge of the relationship between clustered members can be eliminated and clusters are formed by seeking high correlated adjacent ... |
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| Exploring Convergent Evolution to Provide a Foundation for Protein Engineering |
26-Feb-2009 |
11 pages |
| Authors:
Shelley D Copley; COLORADO UNIV AT BOULDER
|
| Pathway holes correspond to steps in a pathway for which a homologue of known enzymes cannot be identified even though other enzymes in the pathway are present. Pathway holes can occur when an organism has independently evolved an enzyme to provide a catalytic function supplied by a structurally and possibly mechanistically different enzyme in other organisms. We have approached the identification of convergently evolved enzymes that fill pathway holes using ... |
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| Unraveling the Nature of Chemical Reactivity of Complex Systems |
13-Jan-2009 |
34 pages |
| Authors:
Kopin Liu; INSTITUTE OF ATOMIC AND MOLECULAR SCIENCES TAIPEI (TAIWAN)
|
| This project was to gain fundamental understanding of the chemical reactivity of complex systems, specifically the state-correlation of product pairs in chemical reactions of polyatomic molecules, and the salvation dynamics of ion-solvent interactions that are fundamental to many important phenomena in chemistry and biology. |
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| Use of Eigenvector-Generated Scatter Plots in Clustering Image Data |
28-Jul-2008 |
|
| Authors:
JERRY SILVERMAN; Charlene Caefer; AIR FORCE RESEARCH LAB HANSCOM AFB MA SENSORS DIRECTORATE/ELECTROMAGNETICS TECHNOLOGY DIV
|
| Over the last few years we have been analyzing state-of-the-art spectral /temporal data of many events. Our goal was to develop specific techniques to classify and identify events based on these measurements. While the techniques evolved from one data type, we focus in this paper on the technique itself and its potential efficacy when applied to other data types. We use a Singular Value Decomposition (SVD) technique to cluster like ... |
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| Terascale Cluster for Advanced Turbulent Combustion Simulations |
25-Jul-2008 |
8 pages |
| Authors:
Stephen B Pope; Steven R Lantz; CORNELL UNIV ITHACA NY
|
| A terascale computing system was purchased and brought into full operation. The main cluster consisted of 36 dual-dual-core Dell servers connected by a QLogic InfiniBand switch. The full system included 2 interactive servers holding 2 terabytes of file storage. The cluster enabled combustion simulations to run on up to 140 processor cores. On benchmarking tests with HP Linpack, the system was found to perform well, achieving 1.15 teraflop/s, or 68.7% ... |
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| Classification, Clustering and Dimensionality Reduction |
08-Jul-2008 |
|
| Authors:
Anil K Jain; MICHIGAN STATE UNIV EAST LANSING DEPT OF COMPUTER SCIENCE/ENGINEERING
|
| The primary goal of pattern recognition is supervised or unsupervised classification. Among the various frameworks in which pattern recognition has been traditionally formulated, the statistical approach has been most intensively studied and used in practice. The design of a recognition system requires careful attention to the following issues: feature extraction and selection, cluster analysis, and classifier design and learning. In spite of almost fifty years of research and development in ... |
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| Combat Service Support Soldier Network Enabled Operations (CSNEO) |
01-Jun-2008 |
123 pages |
| Authors:
Francisco R Baez; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Modeling and simulation provides a cost effective means to gain insights into the potential benefits of network-enabled capabilities in a variety of operational settings. This research outlines a methodology and provides a use case for employing modeling and simulation in the identification of significant factors for network-enabled capabilities. The effort explores the use of the U.S. Army Training and Doctrine Command (TRADOC) Analysis Center's Logistics Battle Command (LBC) model to ... |
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| High Performance Parallel Java with JavaParty |
01-Jun-2008 |
79 pages |
| Authors:
Samuel Nassar; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| To achieve better performance with Java applications, computers can be interconnected with fast networks to form a cluster making available multiple Java Virtual Machines. Unfortunately, Java does not provide an elegant, easy to use mechanism for parallel programming on clusters. JavaParty transparently adds remote objects to Java while avoiding the disadvantages of programming with remote method invocation (RMI) and many disadvantages of the message-passing approach in general. This thesis presents ... |
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| Integrated Data-Driven DSS in a Laboratory Environment |
01-Jun-2008 |
|
| Authors:
Brian L Hargrave; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Decision support technologies have remained individualistic as primarily stand-alone platforms. The ability to access and integrate a wide range of such technologies in an Integrated Decision Technology Environment (IDTE) can potentially increase a user's ability to create more complex decision support projects. A well-designed IDTE will allow users to identify, learn about, access, execute and integrate disparate decision technologies. Data-Driven DSS provide decision makers with the capability to store and ... |
|
| Meeting of New Researchers in Statistics and Probability (10th). Held in Salt Lake City, UT on July 24-28, 2007 |
MAY 2008 |
9 pages |
| Authors:
Mayetri Gupta; NORTH CAROLINA UNIV AT CHAPEL HILL
|
| The Tenth Conference of New Researchers in Statistics and Probability, sponsored by the IMS, was held on the campus of the University of Utah in Salt Lake City, from July 24th to 28th, 2007. This yearly conference provides a unique opportunity for new researchers to exchange research ideas and initiate contacts amongst themselves in an informal setting as well as provide them an opportunity to interact with the invited senior ... |
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| Genomic and Expression Profiling of Benign and Malignant Nerve Sheath Tumors in Neurofibromatosis Patients |
May-2008 |
33 pages |
| Authors:
Brian Rubin; Torsten Nielsen; Matt van de Rijn; STANFORD UNIV CA
|
| The goal of the study is to identify genes that will serve as molecular markers for progression of neurofibroma to MPNST, and to identify potential therapeutic targets. miRNA expression profiling was performed on 6 cases of MPNSTs, and 7 cases of synovial sarcomas. By using unsupervised hierarchical clustering most tumors were grouped together according to tumor type. Subsequent analyses using Significance Analysis of Microarrays (SAM) identified miRNAs that differentiate between ... |
|
| Inhibition of Rac GTPases in the Therapy of Chronic Myelogenous Leukemia |
01-Apr-2008 |
77 pages |
| Authors:
CHILDREN'S HOSPITAL MEDICAL CENTER CINCINNATI OH
|
| Chronic myelogenous leukemia (CML) is a clonal myeloproliferative disease (MPD) characterized by the expression of the p210-BCR/ABL fusion gene [1]. This gene is produced by the reciprocal translocation (9; 22) (q34; q11) that juxtaposes the 3 end of Abelson leukemia virus (ABL) gene with the 5 end of the breakpoint cluster region (Bcr) gene on chromosome 22. The transcript formed as a result encodes for the BCR/ABL fusion protein with ... |
|
| Calculations of Light Scattering Measurements Predicting Sensitivity of Depolarization to Shape Changes of Spores and Bacteria |
APR 2008 |
|
| Authors:
Stephen D. Druger; Jozsef Czege; Zhao Z. Li; Burt V. Bronk; MASSACHUSETTS UNIV LOWELL
|
| This report presents calculations to explore the use of depolarization of scattered light as a discriminator of biological particles in an aerosol. The discrete dipole approximation was used to model appropriate shapes of several different types of particles. To model an ensemble of spores, we used experimental parameters appropriate to Bacillus cereus. For this case, two different but related assumptions for particle shapes are shown to give different and distinguishable ... |
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| Random Graph Standard Network Metrics Distributions in ORA |
01-Mar-2008 |
34 pages |
| Authors:
Kathleen M Carley; Eunice J Kim; CARNEGIE-MELLON UNIV PITTSBURGH PA SCHOOL OF COMPUTER SCIENCE
|
| Networks, and the nodes within them, are often characterized using a series of metrics. Illustrative graph level metrics are the characteristic path length and the clustering co-efficient. Illustrative node level metrics are degree centrality, betweenness centrality, closeness centrality, and eigenvector centrality. A key issue in using these metrics is how to interpret the values; e.g., is a degree centrality of .2 high? With normalized values, we know that these metrics ... |
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| FOCJ as a Means of Regional Cooperation (FOCJ als Mittel regionaler Kooperation) |
01-Mar-2008 |
85 pages |
| Authors:
Peter Friedrich; Florian W Bartholomae; UNIVERSITAET DER BUNDESWEHR MUENCHEN NEUBIBERG (GERMANY) LEHRSTUHL FUR FINANZWISSENSCHAFT
|
| TABLE OF CONTENTS: Appropriate tasks and legal forms of FOCJ (Andreas Leitenstorfer and Andreas Toeroek); Economic expansion financing of an FOCJ (Lavinia Fladung and Peter Friedrich); FOCJ as a basis for growth poles and cluster policy in the high-tech sector (Leopold Zahneisen); Technological progress as a decision criterion for cooperation: European Regional cooperation through FOCJ (Florian W. Bartholomae and Alina M. Popescu). |
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| Evaluation of Target Picking Methods for Magnetic Data |
Mar-2008 |
122 pages |
| Authors:
Tom Furuya; Stephen Billings; SCIENCE APPLICATIONS INTERNATIONAL CORP (SAIC) CARY NC
|
| Due to the large numbers (up to tens of thousands) of possible targets identified in nominal UXO surveys, efficient and reliable machine-aided target pickers should be used to identify targets for subsequent characterization. When selecting anomalies, the goal is to identify all anomalous features that may be caused by UXO while minimizing operator time and eliminating operator bias. To facilitate advanced physics-based modeling, however, the target pickers should also be ... |
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| Dislocation Core and Cross Slip Properties in Metals and Intermetallics: Linking ab initio and Continuum Approaches |
13-Feb-2008 |
23 pages |
| Authors:
Nicholas G Kioussis; CALIFORNIA STATE UNIV NORTHRIDGE DEPT OF PHYSICS
|
| 1) Developed, tested, and implemented a novel concurrent multiscale approach which improves the coupling-quality between the quantum and the classical atomistic regions. This approach, which allows for the first time the study of the dislocation core structure and the effect of chemistry (impurities) on the dislocation core, was applied successfully to aluminum. 2) Developed and applied a novel sequential multiscale approach which couples ab initio and continuum approaches to study ... |
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| Catalysis by Nanostructures: Methane, Ethylene Oxide, and Propylene Oxide Synthesis on Ag, Cu or Au Nanoclusters |
07 FEB 2008 |
10 pages |
| Authors:
Horia Metiu; CALIFORNIA UNIV SANTA BARBARA
|
| The principal investigators have developed new and innovative methods for the preparation of catalytic systems consisting of very small metal clusters supported on an oxide and for the preparation of nano-structured oxides for supporting catalysts or for performing catalysis. Theory was used to analyze many of the observations or to propose new catalytic systems. |
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| Cognitive Agents for Knowledge Discovery |
05 FEB 2008 |
5 pages |
| Authors:
V. R. Vemuri; CALIFORNIA UNIV DAVIS
|
| Discovery of new knowledge, that is, knowledge that we do not already possess, is the focus of this research. This problem can be formulated as an inverse problem, where the new knowledge can be represented by the parameters of a black box model. The solution can then be viewed as the culmination of a sequence of problem solving steps: search, composition, integration and discovery. A well designed cognitive agent capable ... |
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| Combinatorial Markov Random Fields and Their Applications to Information Organization |
FEB 2008 |
166 pages |
| Authors:
Ron Bekkerman; MASSACHUSETTS UNIV AMHERST GRADUATE SCHOOL
|
| We propose a new type of undirected graphical models called a Combinatorial Markov Random Field (Comraf) and discuss its advantages over existing graphical models. We develop an efficient inference methodology for Comrafs based on combinatorial optimization of information-theoretic objective functions; both global and local optimization schema are discussed. We apply Comrafs to multi-modal clustering tasks: standard (unsupervised) clustering, semi-supervised clustering, interactive clustering, and one-class clustering. For the one-class clustering task, ... |
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| Autocorrelation and Regularization of Query-Based Information Retrieval Scores |
FEB 2008 |
146 pages |
| Authors:
Fernando Diaz; MASSACHUSETTS UNIV AMHERST GRADUATE SCHOOL
|
| Query-based information retrieval refers to the process of scoring documents given a short natural language query. Query-based information retrieval systems have been developed to support searching diverse collections such as the world wide web, personal email archives, news corpora, and legal collections. This thesis is motivated by one of the tenets of information retrieval: the cluster hypothesis. We define a design principle based on the cluster hypothesis which states that ... |
|
| On the Non-Uniform Complexity of Brain Connectivity (PREPRINT) |
DEC 2007 |
6 pages |
| Authors:
Gloria Haro; Christophe Lenglet; Guillermo Sapiro; Paul Thompson; MINNESOTA UNIV MINNEAPOLIS INST FOR MATHEMATICS AND ITS APPLICATIONS
|
| A stratification and manifold learning approach for analyzing High Angular Resolution Diffusion Imaging "HARDI" data is introduced in this paper. HARDI data provides high-dimensional signals measuring the complex microstructure of biological tissues, such as the cerebral white matter. We show that these high-dimensional spaces may be understood as unions of manifolds of varying dimensions/complexity and densities. With such analysis, we use clustering to characterize the structural complexity of the white ... |
|
| An Improved Testbed for Highly-Scalable Mission-Critical Information Systems |
05 NOV 2007 |
7 pages |
| Authors:
Robbert Van Renesse; CORNELL UNIV ITHACA NY
|
| Network Emulation Testbeds are highly important resources to Computer Science research and to training students in the field of scalable network infrastructures. The Cornell DURIP cluster is anticipated to increase in usage over the next several years to include more members of the Systems groups here at Cornell University. We also anticipate a greater interaction with our colleagues at AFRL in Rome, NY. For this purpose we have upgraded the ... |
|
| Preparation of Nanoporous Silicon |
OCT 2007 |
22 pages |
| Authors:
Wayne A. Churaman; Luke Currano; ARMY RESEARCH LAB ADELPHI MD SENSORS AND ELECTRON DEVICES DIRECTORATE
|
| While research has focused on the optical properties of nanoporous silicon and its use as an isolation material in integrated circuits, there is a great deal to be gained by understanding the formation process of such a versatile material. The structure itself is made up of millions of pores that are formed through an electrochemical wet etch, which results in network clusters of nanoporous material with a surface area on ... |
|
| Translated Poisson Mixture Model for Stratification Learning (PREPRINT) |
SEP 2007 |
19 pages |
| Authors:
Gloria Haro; Gregory Randal; Guillermo Sapiro; MINNESOTA UNIV MINNEAPOLIS INST FOR MATHEMATICS AND ITS APPLICATIONS
|
| A framework for the regularized and robust estimation of non-uniform dimensionality and density in high dimensional noisy data is introduced in this work. This leads to learning stratifications, that is, mixture of manifolds representing different characteristics and complexities in the data set. The basic idea relies on modeling the high dimensional sample points as a process of Translated Poisson mixtures, with regularizing restrictions, leading to a model which includes the ... |
|
| Scaling Ant Colony Optimization with Hierarchical Reinforcement Learning Partitioning |
SEP 2007 |
90 pages |
| Authors:
Erik Dries; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| This research merges the hierarchical reinforcement learning (HRL) domain and the ant colony optimization (ACO) domain. The merger produces a HRL ACO algorithm capable of generating solutions for both domains. This research also provides two specific implementations of the new algorithm: the first a modification to Dietterich's MAXQ-Q HRL algorithm, the second a hierarchical ACO algorithm. These implementations generate faster results,with little to no significant change in the quality of ... |
|
| Formation Flight of Earth Satellites on KAM Tori |
Sep-2007 |
145 pages |
| Authors:
Christopher T Craft; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF AERONAUTICS AND ASTRONAUTICS
|
| Kolmogorov, Arnold and Moser (KAM) theory provides that orbits of satellites whose dynamics are representable by an integrable Hamiltonian plus a small, real perturbation lie on tori in phase psace and remin on the KAM tori for all time, unless acted upon by a non-conservative force. A refined technique for constructing KAM tori for Earth-orbiting satellites is developed and implemented using numerically integrated orbital data for hypothetical satellites and involving ... |
|
| Implementing Simulation Design of Experiments and Remote Execution on a High Performance Computing Cluster |
SEP 2007 |
109 pages |
| Authors:
Adam J. Peters; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| This thesis focused on creating an object-oriented software architecture around which tools can be created to increase the usability of stochastic simulations such as IWARS and Pythagoras on high performance computing clusters. The objective of the architecture was to enable the user to design and execute simulation experiments using a platformindependent client and server to create a common interface for various simulations. The interface input is used to select the ... |
|
| Discrimination of Objects Within Polarimetric Using Principal Component and Cluster Analysis |
AUG 2007 |
30 pages |
| Authors:
Melvin Felton; Kristan P. Gurton; David Ligon; Adrienne Raglin; ARMY RESEARCH LAB ADELPHI MD COMPUTATIONAL AND INFORMATION SCIENCES DIRECTORATE
|
| We apply two multivariate image analysis techniques to several sets of spatially coincident, long-wave infrared (LWIR), polarimetric images to improve target contrast and/or aid in the identification of certain object features not present in the original image set. Principal component analysis (PCA) was used to obtain new representations of the scene that highlight target features based upon the variance of the variables used in the analysis. We show a representation ... |
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| Global Ground Truth Data Set with Waveform and Arrival Data |
30 JUL 2007 |
111 pages |
| Authors:
Istvan Bondar; Eric Bergman; Benjamin Kohl; Yu-Long Kung; KEITH MCLAUGHLIN; Hans Israelsson; E. R. Engdahl; SCIENCE APPLICATIONS INTERNATIONAL CORP SAN DIEGO CA
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| We present the final results of our three-year research project to produce a high-confidence global GT5 data set. During the course of this project we have developed, tested, and validated the hybrid HDC-RCA (Hypocentroidal Decomposition and Reciprocal Cluster Analysis) methodology to produce new GT5 or better event locations from event clusters. The HDC algorithm uses regional and teleseismic data to estimate precise relative event locations with respect to the cluster ... |
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| Computer-Aided Interval Change Analysis of Microcalcifications on Mammograms for Breast Cancer Detection |
01-Jul-2007 |
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| Authors:
Lubomir Hadjiiski; MICHIGAN UNIV ANN ARBOR
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| The goal of this project is to develop a computer-aided diagnosis (CAD) system for automatic interval change analysis of microcalcification clusters on mammograms. Based on our regional registration method and a search program cluster candidates were detected within the local area on the prior. The cluster on the current image is then paired with the candidates to form true (TP-TP) or false (TP-FP) pairs and a correspondence classifier is designed ... |
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Reports by Keyword(s)
CLUSTERING
