| Astrometry With the Hubble Space Telescope: Trigonometric Parallaxes of Planetary Nebula Nuclei NGC 6853, NGC 7293, ABELL 31, and DeHt 5 |
Dec-2009 |
17 pages |
| Authors:
Edmund Nelan; Howard E Bond; Hugh C Harris; G F Benedict; Barbara E McArthur; Ralf Napiwotzki; Thomas E Harrison; Richard J Patterson; Robin Ciardullo; TEXAS UNIV AT AUSTIN
|
 | We present absolute parallaxes and relative proper motions for the central stars of the planetary nebulae NGC 6853 (The Dumbbell), NGC 7293 (The Helix), Abell 31, and DeHt 5. This paper details our reduction and analysis using DeHt 5 as an example. We obtain these planetary nebula nuclei (PNNi) parallaxes with astrometric data from Fine Guidance Sensors FGS 1r and FGS 3, white-light interferometers on the Hubble Space Telescope. Proper ... |
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| Vehicle Tracking in UAV-Captured Video Data Incorporating Adaptive Weighting of Features |
Jul-2009 |
25 pages |
| Authors:
Noel O'Connor; David Sadlier; DUBLIN CITY UNIV (IRELAND)
|
| In our previous work we have investigated data fusion frameworks for object detection and tracking. In particular, we proposed the use of the spatiogram, as opposed to the more commonly used histogram, for object tracking. The motivation for this stems from the fact that a spatiogram allows coarse encoding of an object's spatial information. In this way it is more robust to changes in object appearance than a histogram that ... |
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| Classical Collision Spectrum of O + CO (Preprint) |
07-Apr-2009 |
21 pages |
| Authors:
M Braunstein; J W Duff; SPECTRAL SCIENCES INC BURLINGTON MA
|
| The work of Noid et al. [J. Chem. Phys., 67, 404 (1977)] has shown that sharp molecular spectra can be obtained through a Fourier transform of the autocorrelation function of a classical trajectory. In the present work, we extend this idea to obtain a spectrum by Fourier transform of the dipole moment function of collision product trajectories. We show that this classical collision spectrum (CCS) is related to the cross ... |
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| Least-Squares Finite Element Formulation for Fluid-Structure Interaction |
Mar-2009 |
276 pages |
| Authors:
Cody C Rasmussen; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
|
| Fluid-structure interaction problems prove difficult due to the coupling between fluid and solid behavior. Typically, different theoretical formulations and numerical methods are used to solve fluid and structural problems separately. The least-squares finite element method is capable of accurately solving both fluid and structural problems. This capability allows for a simultaneously coupled fluid structure interaction formulation using a single variational approach to solve complex and nonlinear aeroelasticity problems. The least-squares ... |
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| Algorithm Design Study for Bathymetry Fusion-Review of Current State-of-the-art and Recommended Design Approach |
30-Dec-2008 |
30 pages |
| Authors:
Chad A Steed; Pau A Elmore; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS MARINE GEOSCIENCES DIV
|
| This report reviews current fusion techniques used for bathymetry or other geospatial data, as motivated by the Naval Oceanographic Office's (NAVOCEANO) need for intelligent fustion -- combining two or more data sets in a manner that accounts for data uncertainty -- of gridded and in situ bathymetric data sets. Based on this review, the recommended approach for building new bathymetry fusion algorithms uses loss interpolation to obtain a trend surface ... |
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| A Prototype Cesium Clock Ensemble for The Loran-C Radionavigation System |
01-Dec-2008 |
15 pages |
| Authors:
Aaron P Dahlen; COAST GUARD WILDWOOD NJ ELECTRONICS ENGINEERING CENTER
|
| This paper presents a prototype real time clock ensemble designed for semi-autonomous operation at unmanned Loran-C radionavigation transmitting stations. This clock is designed to mitigate a doomsday scenario where all space-based timing assets are lost. It is implemented using three free-running commercial cesium oscillators, a traditional measurement system, and an Auxiliary Output Generator (AOG) phase-locked to the weighted mean of the cesium ensemble. A relatively inexpensive rubidium oscillator is used ... |
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| Detection of Frequency-Hopped Signals Exposed to Non-Stationary Interference |
Dec-2008 |
57 pages |
| Authors:
Steven C Layfield; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Frequency-hopped spread spectrum signals are widely used in military communications to help combat or suppress interference due to jamming, other users of the channel, and multipath propagation. Frequency-hopped signals may be difficult to detect when embedded in background noise. Previous research has demonstrated techniques for interference reduction and filtering frequency hopped spread spectrum waveforms with minimum distortion when the frequency-hop rate is on the order of 1,000 hops per second ... |
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| Neck Muscle Fatigue Resulting from Prolonged Wear of Weighted Helmets |
Jun-2008 |
33 pages |
| Authors:
Erin Caldwell; Hilary L Gallagher; Christopher B ALbery; GENERAL DYNAMICS ADVANCED INFORMATION SYSTEMS DAYTON OH
|
| Today's flight helmet incorporates targeting and cueing systems enabling the pilot to accurately cue onboard weapons against enemy aircraft while performing high-G aircraft maneuvers. While these systems undoubtedly increase a pilot's capabilities, one obvious drawback to putting all this equipment on the pilot's helmet is the increase in helmet weight that shifts the combined head and helmet center of gravity (CG) forward, while increasing moments of inertia on the neck. ... |
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| Validation and Implementation of Sensor Sweet Spot Selection Algorithms, Phase 1 (Year 1) |
13 MAY 2008 |
47 pages |
| Authors:
Joseph Kranz; GENERAL DYNAMICS INFORMATION TECHNOLOGY INC FAIRFAX VA
|
| This Phase I effort was to develop weighting factors that characterize the quality of the WAA sensor's received data at various locations within the sensor's performance envelope. This effort involved extensive reviews and analysis of TECHEVAL and OPEVAL reports and other at-sea recorded data on WAA sensor performance. It has defined a detailed technical approach for locating, collecting, interpreting, formatting and restructuring the data into a Common Database. It also ... |
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| An Analysis of Information Asset Valuation (IAV) Quantification Methodology for Application with Cyber Information Mission Impact Assessment (CIMIA) |
MAR 2008 |
134 pages |
| Authors:
Denzil L. Hellesen; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| The purpose of this research is to develop a standardized Information Asset Valuation (IAV) methodology. The IAV methodology proposes that accurate valuation for an Information Asset (InfoA) is the convergence of information tangible, intangible, and flow attributes to form a functional entity that enhances mission capability. The IAV model attempts to quantify an InfoA to a single value through the summation of weighted criteria. Standardizing the InfoA value criteria will ... |
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| Constellation Design of Geosynchronous Navigation Satellites Which Maximizes Availability and Accuracy Over a Specified Region of the Earth |
MAR 2008 |
149 pages |
| Authors:
Halil I. Ozdemir; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| Currently, there are four Global Navigation Satellite Systems (GNSS) either being developed or in existence-GPS, GLONASS, Compass, and Galileo. Additionally, there are several Regional Navigation Satellite Systems (RNSS) planned or in existence, as well as numerous augmentation systems (which require a GNSS for operation). It can be anticipated that there will be interest in developing additional independent regional navigation satellite systems to cover areas of interest to particular countries or ... |
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| The Role of Membrane-Derived Second Messengers and Bmx/Etk in Response to Radiation Treatment of Prostate Cancer |
JAN 2008 |
13 pages |
| Authors:
Christopher Willey; VANDERBILT UNIV MEDICAL CENTER NASHVILLE TN
|
| Radiation-induced activation of the Pl3K/Akt signal transduction pathway requires Akt binding to phosphatidyl-inositol phosphates (PIPs) on the cell membrane. The tyrosine kinase, bone marrow X-kinase (Bmx), binds to PIPs in a manner similar to Akt. Since Bmx is known to be involved in cell growth and survival pathways, Bmx could contribute to the radiation response within the vascular endothelium and prostate cancer, which highly express this protein. We therefore are ... |
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| Objectively Assessing Underwater Image Quality for the Purpose of Automated Restoration |
OCT 2007 |
8 pages |
| Authors:
Weilin Hou; Alan D. Wiedemann; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS OCEANOGRAPHY DIV
|
| To automatically enhance and restore images, especially those taken from underwater environments where scattering and absorption by the medium strongly influence the imaging results even within short distances, it is critical to have access to an objective measure of the quality of images obtained. This contribution presents an approach to measure the sharpness of an image based on the weighted gray-scale-angle (GSA) of detected edges. Images are first decomposed by ... |
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| Dynamic Characteristics and Human Perception of Vibration Aboard a Military Propeller Aircraft |
SEP 2007 |
37 pages |
| Authors:
Suzanne D. Smith; Jenny G. Jurcsisn; Anne Y. Walker; Jeanne A. Smith; David R. Bowden; GENERAL DYNAMICS ADVANCED INFORMATION SYSTEMS DAYTON OH
|
| The dynamic characteristics and human perception of higher frequency multi-axis vibration associated with a military propeller aircraft environment were investigated. Triaxial accelerations were measured at the interfaces between the occupant and aircraft seat surface (seat pan and seat back) to evaluate and compare the effects of the aircraft seat fitted with different cushions. While all cushions showed a significant reduction in the X-axis seat pan vibration as compared to the ... |
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| Reflective Inserts to Reduce Heat Strain in Body Armor: Tests With and Without Irradiance |
AUG 2007 |
6 pages |
| Authors:
Bruce S. Cadarette; William R. Santee; Scott B. Robinson; Michael N. Sawka; ARMY RESEARCH INST OF ENVIRONMENTAL MEDICINE NATICK MA THERMAL AND MOUNTAIN MEDICINE DIVISION
|
| Delivered by U.S . Army Soldier IP : 153.103.190.11 Tue, 04 Dec 2007 irradiance. Aviat Space Environ Med 2007; 78:809 13. Background: This study evaluated adding reflective thermal inserts (RTI) to reduce the physiological strain during exercise-heat stress with a radiant load. RTI were used with a U.S. Army desert battle dress uniform, body armor, and helmet. Methods: Four male volunteers attempted four trials (10 min rest followed by 100 ... |
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| Case-Based Collective Classification |
01-May-2007 |
7 pages |
| Authors:
Luke K McDowell; Kalyan M Gupta; David W Aha; NAVAL ACADEMY ANNAPOLIS MD DEPT OF COMPUTER SCIENCE
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| This is the first paper on textual case-based reasoning to employ collective classification, a methodology for simultaneously classifying related cases that has consistently attained higher accuracies than standard classification approaches when cases are related. Thus far, case-based classifiers have not been examined for their use in collective classification. We introduce Case-Based Collective Classification "CBCC" and report that it outperforms a traditional case-based classifier on three tasks. We also address issues ... |
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| Passive Geolocation of Low-Power Emitters in Urban Environments Using TDOA |
MAR 2007 |
116 pages |
| Authors:
Myrna B. Montminy; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| Low-power devices are commonly used by the enemy to control Improvised Explosive Devices (IEDs), and as communications nodes for command and control. Quickly locating the source of these signals is difficult, especially in an urban environment where buildings and towers can cause interference. This research presents a geolocation system that combines several geolocation and error mitigation methods to locate an emitter in an urban environment. The proposed geolocation system uses ... |
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| A Weighted Consensus Approach to Tropical Cyclone 96-H and 120-H Track Forecasting |
MAR 2007 |
107 pages |
| Authors:
James R. Hughes; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| A long-range (96 h-120 h) weighted position consensus for tropical cyclone tracks is evaluated for 24 western North Pacific storms in 2006. The first weighted position technique simply weights the 96-h, 108-h, and 120-h dynamical model positions inversely to their distances from the 60-h, 66-h, and 72-h consensus positions. The second weighted consensus technique uses the same weighting factors but is applied to the forecast motion vectors to assess 96 ... |
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| A Security Risk Measurement for the RAdAC Model |
MAR 2007 |
89 pages |
| Authors:
David W. Britton; Ian A. Brown; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The purpose of this thesis is to provide a quantification process for the risk module of the NSA RAdAC model. The intent is to quantify the risk involved in a single information transaction. Additionally, this thesis will attempt to identify the risk factors involved when calculating the total security risk measurement. This list is not intended to be an all-inclusive list of every factor associated with a transaction. Rather, we ... |
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| Predicting Subjective Workload Ratings: A Comparison and Synthesis of Operational and Theoretical Models |
MAR 2007 |
14 pages |
| Authors:
Jerry Crutchfield; Craig Rosenberg; FEDERAL AVIATION ADMINISTRATION OKLAHOMA CITY OK CIVIL AEROMEDICAL INST
|
| Output from a computer simulation of two air traffic control (ATC) scenarios was fit to workload ratings that ATC subject-matter experts provided while observing each scenario in real time. Simulation output enabled regression analyses that tested the assumptions of a variety of workload prediction models. These included both operational models that use observable situational and behavioral variables (e.g., number of aircraft and communications by type) and theoretical models that use ... |
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| Fundamentals of Signal Processing for Phased Array Radar |
01 SEP 2006 |
23 pages |
| Authors:
Ulrich Nickel; FGAN-FHR RESEARCH INST FOR HIGH FREQUENCY PHYSICS AND RADAR TECHNIQUES WACHTBERG (GERMANY)
|
| This section gives a short survey of the principles and the terminology of phased array radar. Beamforming, radar detection and parameter estimation are described. The concept of subarrays and monopulse estimation with arbitrary subarrays is developed. As a preparation to adaptive beam forming, which is treated in several other sections, the topic of pattern shaping by deterministic weighting is presented in more detail. |
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| Principles of Adaptive Array Processing |
01 SEP 2006 |
21 pages |
| Authors:
Ulrich Nickel; FGAN-FHR RESEARCH INST FOR HIGH FREQUENCY PHYSICS AND RADAR TECHNIQUES WACHTBERG (GERMANY)
|
| In this lecture we present the principles of adaptive beamforming, the problem of estimating the adaptive weights and several associated practical problems, like preserving low sidelobe patterns, using subarrays and GSLC configurations. We explain the detection problem with adaptive arrays and the methods for angle estimation. Finally the methods for resolution enhancement (super-resolution methods) are presented. |
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| Interactive Image Segmentation via Adaptive Weighted Distances (PREPRINT) |
AUG 2006 |
10 pages |
| Authors:
Alexis Protiere; Guillermo Sapiro; MINNESOTA UNIV MINNEAPOLIS INST FOR MATHEMATICS AND ITS APPLICATIONS
|
| An interactive algorithm for soft segmentation of natural images is presented in this paper. The user first roughly scribbles different regions of interest, and from them the whole image is automatically segmented. This soft segmentation is obtained via fast, linear complexity, computation of weighted distances to the user-provided scribbles. The adaptive weights are obtained from a series of Gabor filters, and are automatically computed according to the ability of each ... |
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| Reweighting AT-SAT to Mitigate Group Score Differences |
JUL 2006 |
12 pages |
| Authors:
Andrew R. Dattel; Raymond E. King; FEDERAL AVIATION ADMINISTRATION OKLAHOMA CITY OK CIVIL AEROMEDICAL INST
|
| The Air Traffic Selection and Training (AT-SAT) test battery is the selection tool for applicants for Air Traffic Control Specialist (ATCS) positions within the FAA who have not previously been employed as an air traffic controller. AT-SAT is an aptitude test developed to predict the likelihood of successfully learning ATCS skills. Before operational use, however, concerns were raised about the low passing rate of incumbent ATCS personnel who participated in ... |
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| Quantification of Subjective Information Assessments in C2 Decision Option Selection |
JUN 2006 |
45 pages |
| Authors:
Michael B. Cowen; Robert A. Fleming; SPACE AND NAVAL WARFARE SYSTEMS COMMAND SAN DIEGO CA
|
| Two of the more subjective processes in decision making involve forming an opinion about each decision-relevant information item (i.e., the impact and importance of that item to any decision option) and then selecting one option based upon some form of cognitive weighting of the entire information pool. The decision support package described here simplifies and quantifies these two processes by supplying an intuitive interface to capture: (1) location of the ... |
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| Development of a Methodology for Customizing Insider Threat Auditing on a Microsoft Windows XP Operating System |
MAY 2006 |
143 pages |
| Authors:
Terry E. Levoy; AIR FORCE INST OF TECHNOLOGY WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
|
| Most organizations are aware that threats from trusted insiders pose a great risk to their organization and are very difficult to protect against. Auditing is recognized as an effective technique to detect malicious insider activities. However, current auditing methods are typically applied with a one-size-fits-all approach and may not be an appropriate mitigation strategy, especially towards insider threats. This research develops a 4-step methodology for designing a customized auditing template ... |
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| Suppression of Doppler Ambiguities for Linear Sparse Arrays |
APR 2006 |
8 pages |
| Authors:
Jaime R. Roman; James W. Nelander; John W. Garnham; John D. Keisling; Lynn M. Black; AIR FORCE RESEARCH LAB KIRTLAND AFB NM SPACE VEHICLES DIRECTORATE
|
| A key trade-on in airborne or spaceborne synthetic aperture radar (SAR) design involves the pulse repetition frequency (PRF) and the number and location or range and Doppler ambiguities. The associated design issues are complicated further when the system involves a sparse array. A methodology is formulated based on selecting the PRF to avoid range ambiguities in the envelope mainbeam. The effects or the Doppler ambiguities falling within the envelope mainbeam ... |
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| Minimum Expected Risk Estimation for Near-neighbor Classification |
APR 2006 |
21 pages |
| Authors:
Maya R. Gupta; Santosh Srivastava; Luca Cazzanti; WASHINGTON UNIV SEATTLE DEPT OF ELECTRICAL ENGINEERING
|
| We consider the problems of class probability estimation and classification when using near-neighbor classifiers, such as k-nearest neighbors (kNN). This paper investigates minimum expected risk estimates for neighborhood learning methods. We give analytic solutions for the minimum expected risk estimate for weighted kNN classifiers with different prior information, for a broad class of risk functions. Theory and simulations show how significant the difference is compared to the standard maximum likelihood ... |
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| To Graduate from USAFA: Identifying Which Admissions Criteria Make the Best Predictors of Cadet Success |
APR 2006 |
69 pages |
| Authors:
III Webb Beacher R.; JOHN F KENNEDY SCHOOL OF GOVERNMENT CAMBRIDGE MA
|
| The purpose of this study is to identify which admissions criteria make the best predictors of cadet success at the United States Air Force Academy. Using graduation as the measure of cadet success, the study's findings and resulting recommendations seek to increase the efficiency of selection decisions and hence the graduation rate. The study's methodology uses 10 years of existing cadet data to quantify, rank, and interpret the admissions criteria's ... |
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| Application of Fuzzy State Aggregation and Policy Hill Climbing to Multi-Agent Systems in Stochastic Environments |
MAR 2006 |
79 pages |
| Authors:
Dean C. Wardell; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| Reinforcement learning is one of the more attractive machine learning technologies, due to its unsupervised learning structure and ability to continually even as the operating environment changes. Applying this learning to multiple cooperative software agents (a multi-agent system) not only allows each individual agent to learn from its own experience, but also opens up the opportunity for the individual agents to learn from the other agents in the system, thus ... |
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| The 2005 AFRL/HEC One-Speaker Detection Systems |
FEB 2006 |
10 pages |
| Authors:
Raymond E. Slyh; Eric G. Hansen; Brian M. Ore; GENERAL DYNAMICS ADVANCED INFORMATION SYSTEMS DAYTON OH
|
| This paper describes the one-speaker detection systems submitted by AFRL/HEC for several of the training and testing conditions in the 2005 NIST Speaker Recognition Evaluation. For each condition, the overall system score was the weighted combination of scores from several component systems. The component systems were based on: mel-frequency cepstral coefficients (MFCCs) and (Gaussian mixture models (GMMs); MFCCs and phoneme-specific GMMs (PS-GMMs); linear-prediction-based cepstral coefficients (LPCCs) from closed-phase analysis; formant ... |
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| Chapter 10: A Hilbert Space Approach To Variance Reduction |
16-Nov-2005 |
33 pages |
| Authors:
Roberto Szechtman; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OPERATIONS RESEARCH
|
| In this chapter we explain variance reduction techniques from the Hilbert space standpoint, in the terminating simulation context. We use projection ideas to explain how variance is reduced, and to link different variance reduction techniques. Our focus is on the methods of control variates, conditional Monte Carlo, weighted Monte Carlo, stratification, and Latin hypercube sampling. |
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| Analysis of a Subdomain-Based Error Estimator for Finite Element Approximations of Elliptic Problems |
19 OCT 2005 |
34 pages |
| Authors:
S. Prudhomme; F. Nobile; L. Chamoin; J. T. Oden; TEXAS INST FOR COMPUTATIONAL AND APPLIED MATHMATICS AUSTIN
|
| In this paper we analyze a sub-domain residual error estimator for finite element approximations of elliptic problems. It is obtained by solving local problems on patches of elements in weighted spaces and provides for an upper bound on the energy norm of the error when the local problems are solved in sufficiently enriched discrete spaces. a guaranteed lower bound on the error is also derived by a simple post process ... |
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| A Compiler and Runtime Infrastructure for Automatic Program Distribution |
28 SEP 2005 |
11 pages |
| Authors:
Roxana E. Diaconescu; Lei Wang; Zachary Mouri; Matt Chu; CALIFORNIA INST OF TECH PASADENA CENTER FOR ADVANCED COMPUTING RESEARCH
|
| This paper presents the design and the implementation of a compiler and runtime infrastructure for automatic program distribution. We are building a research infrastructure that enables experimentation with various program partitioning and mapping strategies and the study of automatic distribution's effect on resource consumption (e.g., CPU, memory, communication). Since many optimization techniques are faced with conflicting optimization targets (e.g., memory and communication), we believe that it is important to be ... |
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| Optical Dynamic Assignment for Low Earth Orbit Satellite Constellations |
14 SEP 2005 |
8 pages |
| Authors:
Alexander Melin; K. S. Erwin; VijaySekhar Chellaboina; TENNESSEE UNIV KNOXVILLE DEPT OF MECHANICAL AND AEROSPACE ENGINEERING
|
| In this paper we investigate autonomous task assignment for a group or low-earth orbit satellites that don't necessarily have prior knowledge or the targets or interest. Specifically, we consider the optimal assignment problem for dynamic weighted bipartite graphs. First, we present necessary and sufficient conditions for the existence of a perfect matching in a given bipartite graph. Next, we present an algorithm to construct a virtual graph based on the ... |
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| Determining the Applicability of the Barotropic Approximation to the Mean Seasonal Flow Through the Tsushima/Korean Strait using Variational Assimilation |
21 JUL 2005 |
22 pages |
| Authors:
S. R. Smith; G. A. Jacobs; R. R. Leben; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS
|
| Variational assimilation is used to combine velocity and sea-surface height anomaly (SSHA) measurements with a system of dynamics to estimate the seasonal flow through the Taushima/Korean Strait for the summer, autumn and winter seasons of 1999-2000. The velocity measurements are from two lines of moored acoustic Doppler Current profilers (ADCPs) spanning the Tsushima/Korean strait just north and south of Tsushima island and the SSHA measurements are from the TOPEX altimeter. ... |
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| Analysis of the USMC FITREP: Contemporary or Inflexible? |
MAR 2005 |
278 pages |
| Authors:
Mark Jobst; Jeffrey Palmer; NAVAL POSTGRADUATE SCHOOL MONTEREY CA GRADUATE SCHOOL OF BUSINESS AND PUBLICPOLICY
|
| The purpose of this thesis is threefold. Firstly, to attempt to provide validity for the two-sided matching process; secondly, analyze FITREP attributes to determine their suitability for a weighted criteria evaluation system and; thirdly, compare the USMC promotion and assignment process with contemporary human resource management practices. Using data from the USMC officer Accession Career file (MCCOAC), a logit model is used to estimate the effects of TBS preference and ... |
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| Analyzing the Assignment of Enlisted Recruiting Goal Shares via the Navy's Enlisted Goaling and Forecasting Model |
MAR 2005 |
113 pages |
| Authors:
Ronald A. Hojnowski; NAVAL POSTGRADUATE SCHOOL MONTEREY CA GRADUATE SCHOOL OF BUSINESS AND PUBLICPOLICY
|
| This thesis examines the process by which enlisted goal shares are generated by Commander, Navy Recruiting Command (CNRC) and assigned to Navy Regional recruiting commands. Through use of an econometric goaling and forecasting model employed by CNRC and a less complicated weighting system used by Regions, goal shares are generated using factors believed to accurately predict future recruiting success. The factors used in the new contract prediction model include local ... |
|
| On Lagrangian Meshless Methods in Free-Surface Flows |
JAN 2005 |
73 pages |
| Authors:
Jon P. Silverberg; CALIFORNIA UNIV BERKELEY COMPUTATIONAL MARINE MECHANICS LABORATORY
|
| Classically, fluid dynamics have been dealt with analytically because of the lack of numerical resources (Yeung, 1982). With the development of computational ability, many formulations have been developed which typically use the traditional Navier-Stokes equations along with an Eulerian grid. Today, there exists the possibility of using a moving grid (Lagrangian) along with a meshless discretization. The first issue in meshless fluid dynamics is the equations of motion. There are ... |
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| Optimal Mixture Models in IR |
2005 |
21 pages |
| Authors:
Victor Lavrenko; MASSACHUSETTS UNIV AMHERST CENTER FOR INTELLIGENT INFORMATION RETRIEVAL
|
| We explore the use of Optimal Mixture Models to represent topics. We analyze two broad classes of mixture models: set-based and weighted. We provide an original proof that estimation of set-based models is NP-hard, and therefore not feasible. We argue that weighted models are superior to set-based models, and the solution can be estimated by a simple gradient descent technique. We demonstrate that Optimal Mixture Models can be successfully applied ... |
|
| Optimal Sensing/Actuation Strategies for Vibration and Acoustic Control of Optical Systems |
2005 |
13 pages |
| Authors:
Suk-Min Moon; Leslie P. Fowler; Robert L. Clark; DUKE UNIV DURHAM NC DEPT OF MECHANICAL ENGINEERING AND MATERIALS SCIENCE
|
| Optical jitter can result in the beam pointing inaccuracy and poor optical system performance. With a correlated measurement of the disturbance, improved control performance can be achieved. In this research, an adaptive optimal sensing strategy for optical systems is proposed. When an array of reference sensors is available, an optimal set of reference sensors that are coupled to modes of interests can be selected. The weighted reference signal from the ... |
|
| 4 Tesla Whole Body MRI MRSI System for Investigation of Neurodegenerative Diseases |
OCT 2004 |
9 pages |
| Authors:
Michael W. Weiner; NORTHERN CALIFORNIA INST FOR RESEARCH AND EDUCATION SAN FRANCISCO
|
| The overall long-term goal of imaging research to be performed with this 4 Tesla Siemens/Bruker MRI system is the development of improved diagnostic methods for accurate detection of neurodegenerative disease and responses to treatment. The 4T MRI system was installed and accepted at the end of December last year. During the past months, our physicists mainly focused on developing and testing new imaging sequences and on implementing a comprehensive imaging ... |
|
| Environmental Life Cycle Techniques for New Weapons Acquisition Systems |
SEP 2004 |
59 pages |
| Authors:
Michael Overcash; NORTH CAROLINA STATE UNIV AT RALEIGH
|
| Environmental issues are an integral part of new systems acquisitions, from the simplest product to the more complex systems. This project is a part of the effort to understand the product variables for new systems and the methods for environmental improvement. The first system studied, in this joint US. Swedish project, is a PFHE shell grenade. We have begun by improving the techniques for determining the chemical emissions and energy ... |
|
| Development and Evaluation of an Automated Decision Aid for Rapid Re- Tasking of Air Strike Assets in Response to Time Sensitive Targets |
JUN 2004 |
135 pages |
| Authors:
Paul R. Weaver; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| This thesis addresses the problem of optimally re-assigning strike aircraft to targets in response to the emergence of "pop-ups" or time-sensitive targets. The first part of this thesis develops an automated decision aid to rapidly revise the current air tasking order (ATO) so as to: maximize achievement of target destruction goals (weighted by target prionties) minimize attrition risk to employed assets and disrupt the current ATO as little as possible. ... |
|
| Application of Sequential Auction Techniques to Nonlinear Targeting Assignment for Space-Delivered Entry Vehicles |
MAY 2004 |
123 pages |
| Authors:
Brian A. Stiles; RICE UNIV HOUSTON TX
|
| In the future, the arsenal of the U.S. military will include Space- delivered weapons, released by reusable launch vehicles. Entry vehicles released from the launch platforms will be capable of guiding to target locations throughout the world. In order to adequately incorporate these weapons into military plans, theater commanders will require sophisticated planning algorithms to maximize the likelihood of destroying the most important targets. This thesis develops a target assignment ... |
|
| Hypohydration Effects on Thermoregulation During Moderate Exercise in the Cold |
26 MAR 2004 |
7 pages |
| Authors:
R. W. Kenefick; N. V. Mahood; M. P. Hazzard; T. J. Quinn; J. W. Castellani; ARMY RESEARCH INST OF ENVIRONMENTAL MEDICINE NATICK MA THERMAL AND MOUNTAIN MEDICINE DIVISION
|
| Abstract Hyperosmotic hypovolemia impairs vasoconstriction during sedentary cold exposure. The purpose of this study was to determine whether hypohydration alters thermoregulation and cardiovascular responses to exercise in cold air. On four occasions, eight males {35.I (2.7) years, 175.5 (3.1) cm 73.3 (2.6) kg, 57.2 (2.6) ml. kg-1 min-' maximal oxygen uptake( VO2max), 19.6 (2.4)% fat] walked, in t--shirt, shorts, and shoes, at 50% V0Z,nax, for 60 min in either a ... |
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| Blind Deconvolution of Anisoplanatic Images Collected by a Partially Coherent Imaging System |
23 MAR 2004 |
171 pages |
| Authors:
Adam MacDonald; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
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| Coherent imaging systems offer unique benefits to system operators in terms of resolving power, range gating, selective illumination and utility for applications where passively illuminated targets have limited emissivity or reflectivity. This research proposes a novel blind deconvolution algorithm that is based on a maximum a posteriori Bayesian estimator constructed upon a physically based statistical model for the intensity of the partially coherent light at the imaging detector. The estimator ... |
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| A02-100: High Gain Antenna for Wireless Local Area Network (LAN), "Multi-Band Coaxial CTS Antenna" |
18 MAR 2004 |
41 pages |
| Authors:
William W. Milroy; Magdy Iskander; Michael A. Burke; THINKOM SOLUTIONS INC TORRANCE CA
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| Report developed under Phase I SBIR contract for topic A02-100. US military mobility and network centric warfare drove need for directive, steerable antennas at 1.85.7 GHz. ThinKom (and University of Hawaii) investigated antenna technologies: 1) multi-band coaxial CTS and 2) WAVETRAP, invented by ThinKom. Coaxial CTS and WAVETRAP naturally broad beam, but can generate high gain beams; 20+dB for coaxial CTS and 10+dB for WAVETRAP. For beam steering & sidelobe ... |
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| A Language Modeling Framework for Selective Query Expansion |
2004 |
10 pages |
| Authors:
Steve Cronen-Townsend; Yun Zhou; W. B. Croft; MASSACHUSETTS UNIV AMHERST CENTER FOR INTELLIGENT INFORMATION RETRIEVAL
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| Query expansion is a well-known technique that has been shown to improve average retrieval performance. This technique has not been used in many operational systems because of the fact that it can greatly degrade the performance of some individual queries. We show how comparison between language models of the unexpanded and expanded retrieval results can be used to predict when the expanded retrieval has strayed from the original sense of ... |
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| Performance Analysis of the Weighted Window CFAR Algorithms |
05 SEP 2003 |
5 pages |
| Authors:
Meng Xiangwei; Guan Jian; He You; NAVAL AERONAUTICAL ENGINEERING ACADEMY YANTAI (CHINA) DEPT OF ELECTRONIC ENGINEERING
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| With the deterioration of radar operation environment and the enhancement of menace to radar, the task of radar targets detection becomes more complicated. Such as the detection of airplane, ship or cruise missile in over the horizon radar (OTHR), and the detection of the moving targets in synthetic aperture radar (SAR). Therefore, it's necessary to make further study on CFAR algorithms. The performance of conventional cell averaging (CA) algorithm is ... |
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