| Software-Defined Underwater Acoustic Networking Platform |
03-Nov-2009 |
9 pages |
| Authors:
Jonathan Friedman; Dustin Torres; Thomas Schmid; Mani B Srivastave; CALIFORNIA UNIV LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
|
 | Currently acoustics is the primary modality for underwater communication even though it presents a difficult channel. To try and cope with the challenges of the channel many MAC protocols and PHY layer techniques have been proposed. In this paper we present a research platform that allows developers to easily implement and compare their protocols in an underwater network and configure them at runtime. We have built our platform using widely ... |
|
| Fight's On! Volume 8, Issue 3 |
Nov-2009 |
5 pages |
| Authors:
Gina Cinardo; AIR FORCE RESEARCH LAB MESA AZ HUMAN EFFECTIVENESS DIRECTORATE
|
| This newsletter contains the following articles: Tactical digital holograms favored over conventional 2D imagery; Gaming and training: Examining the learning potential of games in live, virtual, and constructive operations; 711HPW/RHA begins analysis of Joint Terminal Attack Controller training effectiveness; Experimental Deployable Tactical Training Testbed (X-DTT) goes to Aviano Air Base, Italy, for 18-month field evaluation; Game-based defensive counter space training exemplar transitions to field; and 711HPW/RHA exercise recognized by community ... |
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| The Bridging Work of Educational Informatics: Supporting Innovations across Virtual and Real-World Learning Environments |
22-Oct-2009 |
13 pages |
| Authors:
Andrew G Stricker; Toni Scribner; AIR UNIV MAXWELL AFB AL
|
| The Air Force community will see growing interconnectivity between the physical world and virtual worlds to better augment and bridge formal and informal learning and decision support across a life-long continuum of service. The seams between virtual and physical systems will increasingly become ubiquitous in service to life-long learning and support of Airmen. For example, advances in informatics, the science and design of interactions between natural and artificial systems, will ... |
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| Rewriting History: Historical Research With the Digital Plan |
Oct-2009 |
18 pages |
| Authors:
Molly Marshall; Lauren Scharff; AIR FORCE ACADEMY COLORADO SPRINGS CO INST FOR INFORMATION TECHNOLOGY APPLICATIONS
|
| This study examined the use of technology to enhance the educational experience. The study, which involved 28 Cadets from the United States Air Force Academy, was designed to examine the benefits of using a digital pen for note taking in the classroom. The Department of History offers a Historiography and Methods class (History 330), where cadets research historical data. The cadets plan, research and write a 5000-7000 word term paper. ... |
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| Understanding and Predicting Urban Propagation Losses |
Sep-2009 |
105 pages |
| Authors:
Mark R Alexander; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF INFORMATION SCIENCES
|
| Modern day warfare has presented the United States with a more technically savvy opponent in conflicts that have moved away from the traditional battlefield to the populated environment of the big city. Battle space dominance no longer refers simply to the physical nature of war, but now also encompasses a digital environment with a greater influence on Information Warfare. One of the keys to successfully maintaining open wireless lines of ... |
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| Document-Based and Message-Centric Security Using XML Authentication and Encryption for Coalition and Interagency Operations |
Sep-2009 |
228 pages |
| Authors:
William; Jeffrey S Sr; NAVAL POSTGRADUATE SCHOOL MONTEREY CA MODELING VIRTUAL ENVIRONMENTS AND SIMULATION (MOVES)
|
| Different agencies and different nations are not able to securely communicate and share structured information due to differences in security policies and data formats. The current evolution of security and data policies is not solving this fundamental problem. Document-based message-centric XML security can provide satisfactory security within a diversified communications framework between traditional and nontraditional partners by utilizing existing Web standards for XML canonicalization, XML digital signature, XML compression and ... |
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| Determining a Critical-Skill Hierarchy for Command Post of the Future (CPOF) |
Jul-2009 |
53 pages |
| Authors:
Richard L Wampler; Martin L Bink; Richard Catrambone; GEORGIA INST OF TECH ATLANTA
|
| The Command Post of the Future (CPOF) is a dynamic visualization tool that supports collaborative decision-making in tactical units. The system uses a customizable workspace based on the user's needs rather than a static format. While such an approach to digital-systems design offers flexibility and generality of use, it might also increase the complexity of learning to use the interface. As a precursor to examining alternative training approaches for CPOF, ... |
|
| Doubly Fed Induction Machine Control For Wind Energy Conversion System |
01-Jun-2009 |
115 pages |
| Authors:
Jason G Massey; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Due to increasing concerns about CO2 emissions and the shortage of fossil fuels, renewable energy has become a major topic in economic discussions. One renewable source is energy that can be extracted from the wind. This thesis covers the basics of using a doubly-fed induction generator (DFIG) to convert the mechanical energy of the wind into useful electrical power that can be used to supply electricity to any grid. Implementation ... |
|
| Digital Authentication for Official Bulk Email |
Mar-2009 |
77 pages |
| Authors:
Andrew A Slack; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Official bulk email is an efficient tool for disseminating information to a wide audience. Its inherent efficiency, captive audience, and trust provide a dangerous attack vector for adversaries utilizing fraudulent email. Digital authentication can provide a layer of defense to official bulk email that, combined with other defensive countermeasures, will greatly reduce its vulnerabilities. The Department of Defense mandates that official emails, which contain hyperlinks, attachments, or instructions to recipients, ... |
|
| Utilizing Microelectromechanical Systems (MEMS) Micro-Shutter Designs for Adaptive Coded Aperture Imaging (ACAI) Technologies |
Mar-2009 |
131 pages |
| Authors:
Mary M Ledet; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
|
| The Air Force has long relied on surveillance for intelligence and strategic purposes. Most surveillance systems rely on a lensing system to acquire their images, most of which are in either the visible or infrared wavelengths. Because lensing systems can be expensive, obtrusive, or hard to maintain, researchers have designed adaptive coded aperture imaging (ACAI) as a replacement system. Coded aperture imaging(CAI) has been used in both the astronomical and ... |
|
| Development and Evaluation of Soldier Symbology |
Mar-2009 |
82 pages |
| Authors:
Michael Matthews; Jeremy Robson; David W Tack; HUMANSYSTEMS INC GUELPH (ONTARIO)
|
| Future soldier systems are being developed that can display a soldier's geo-location on a portable, wearable digital display but common NATO symbology does not exist for displaying these soldiers on a map. NATO Land Capability Group 1 (LCG 1) has identified a need to develop and validate common symbology for the individual soldier that can be displayed on a wide range of digital display types, to improve the joint interoperability ... |
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| An Investigation of Image Fusion Algorithms using a Visual Performance-based Image Evaluation Methodology |
Feb-2009 |
34 pages |
| Authors:
Kelly E Neriani; Alan R Pinkus; David W Dommett; GENERAL DYNAMICS ADVANCED INFORMATION ENGINEERING SERVICES INC DAYTON OH
|
| It is believed that the fusion of multiple different images into a single image should be of great benefit to warfighters engaged in a search task. As such, more research has focused on the improvement of algorithms designed for image fusion. Many different fusion algorithms have already been developed; however, the majority of these algorithms have not been assessed in terms of their visual performance-enhancing effects using militarily relevant scenarios. ... |
|
| Embedded Meta-Material Antennas |
31-Jan-2009 |
21 pages |
| Authors:
Dennis W Prather; DELAWARE UNIV NEWARK
|
| With the dawn of the Digital Battlefield, a critical capability in the modern warfare environment is the miniaturization of electronic warfare signal and information processing systems. To realize such systems, the key is to miniaturize antennas that transmit and receive signals. In particular, by introducing reconfigurable antennas, one can combine multiple antennas operating at various frequency bands into a single aperture, which can provide significant miniaturization and flexibility to the ... |
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| New Astrometric Reduction of the USNO Photographic Plates of Planetary Satellites |
Jan-2009 |
5 pages |
| Authors:
Dan Pascu; Valery Lainey; Norbert Zacharias; De; Jean-Pierre Cuyper; Lars de Winter; Georges Decker; Jean-Eudes Arlot; Vincent Robert; BELGIAN ROYAL OBSERVATORY UCCLE
|
| An international collaboration has been set up between the US Naval Observatory (USNO) in Washington DC, the IMCCE of Paris Observatory (OBSPM) and the Royal Observatory of Belgium (ROB) to make a new astrometric reduction of the USNO archival photographic plates of planetary satellites. In order to obtain a better knowledge of their orbital motions these photographic plates are digitized with the new generation DAMIAN digitizer at the ROB, providing ... |
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| Chaotic Scrambling for Wireless Analog Video |
Dec-2008 |
8 pages |
| Authors:
KRISHNA MYNENI; Shawn D Pethel; Ned J Corron; Billy R Reed; Jonathan N Blakely; ARMY RESEARCH DEVELOPMENT AND ENGINEERING COMMAND REDSTONE ARSENAL AL
|
| We report the implementation of an in-band chaotic scrambler for securing wireless analog video. In this demonstration system, an analog video signal is injected into a chaotic oscillator and the output is transmitted through a standard wireless video link. At the receiver, a descrambler separates the video from the chaotic signal in real time. Experimental results show the scrambled signal effectively hides the original video image, yet the descrambler recovers ... |
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| Command and Control in a Multitouch Environment |
Dec-2008 |
8 pages |
| Authors:
R Szymanski; M Goldin; N Palmer; R Beckinger; J Gilday; T Chase; ARMY COMMUNICATIONS-ELECTRONICS RESEARCH DEVELOPMENT AND ENG CTR FT MONMOUTH NJ COMMAND AND CONTROL DIRECTORATE (C2 DIRECTORATE)
|
| As the Army continues its movement toward NetCentricity, the need for face-to-face collaboration remains. Although commanders will eventually have the ability to utilize large bandwidth pipes and robust software services to collaborate remotely, there is no indication commanders will loose their desire to conduct localized planning sessions eyeball-to-eyeball. However, little is currently being done to provide computer assistance for in-person collaboration. This paper advanced user interface discusses the use of ... |
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| Demonstration of Helicopter Multi-sensor Towed Array Detection System (MTADS) Magnetometry at Former Camp Beale, California |
01-Oct-2008 |
94 pages |
| Authors:
David Wright; Jack Foley; SKY RESEARCH ASHLAND OR
|
| Helicopter Multisensor Towed Array Detection System (MTADS) Magnetometry (HeliMag) technology was demonstrated as part of the ESTCP Wide Area Assessment Pilot Program. This report documents the acquisition, processing, analysis, and interpretation of Helicopter Multisensor Towed Array Detection System Magnetometry data for unexploded ordnance related sites at nearly 5,000 acres at former Camp Beale, California. The performance criteria for positioning accuracy, system noise, data density, MEC parameter estimates, and operating parameters ... |
|
| Analysis of Digitized Seismograms from Russian Geophysical Survey Stations of Soviet Peaceful Nuclear Explosions |
30-Sep-2008 |
4 pages |
| Authors:
Kevin G Mackey; MICHIGAN STATE UNIV EAST LANSING
|
| Throughout the 1970s and 1980s, the permanent seismic stations of the Soviet Union recorded over 100 Peaceful Nuclear Explosions (PNEs) detonated within the Soviet Union. These records have not been analyzed using modern digital methods and remain in Russian Archives. We have started a new initiative in collaboration with the Institute of Petroleum Geology and Geophysics (IPGG) of the Siberian Branch of the Russian Academy of Sciences (RAS) in Novosibirsk ... |
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| Improvements to a Major Digital Archive of Seismic Waveforms from Nuclear Explosions: Borovoye Seismogram Archive |
30-Sep-2008 |
11 pages |
| Authors:
Won-Young Kim; Paul Richards; Howard Patton; George Randall; COLUMBIA UNIV PALISADES NY LAMONT-DOHERTY EARTH OBSERVATORY
|
| We are in the second year of a three-year project to generate in modern form an easily usable archive of digital seismograms derived from regional waveforms recorded at the Borovoye Observatory (BRV), northern Kazakhstan, over a thirty-year period going back to 1966 and spanning the time when state-of-the-art sensors and dataloggers were introduced at this site by several different western groups. The BRV seismograms, which include multichannel regional signals from ... |
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| Design and Implementation of a Motor Incremental Shaft Encoder |
01-Sep-2008 |
119 pages |
| Authors:
La; Andrew M Valley; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The Department of Electrical and Computer Engineering at the Naval Postgraduate School continuously develops new design applications and searches for new ways to arm the students with the tools necessary to gain a greater understanding of advanced motor applications. One such tool is the Student Design Center (SDC). The SDC utilizes Field Programmable Gate Array (FPGA) technology for digital control of motor applications. One of the key factors in motor ... |
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| Development of a Distributed Digital Array Radar (DDAR) |
01-Sep-2008 |
180 pages |
| Authors:
Pontus Djerf; Ioannis Tornazakis; NAVAL POSTGRADUATE SCHOOL MONTEREY CA GRADUATE SCHOOL OF BUSINESS AND PUBLIC POLICY
|
| Distributed digital arrays have many potential applications in radar and communication systems. The objective of this thesis is to re-examine previous research on distributed digital array radar (DDAR) and evaluate several critical aspects of a proposed wireless architecture. Self-standing transmit/receive (T/R) modules are synchronized wirelessly. An important issue addressed in this thesis is whether a simple low-cost synchronization circuit would perform adequately. To this end two breadboard T/R modules were ... |
|
| Experimental Study of Composites and Metal-Wire Joints |
01-Sep-2008 |
51 pages |
| Authors:
William A Schultz; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| In order to join a composite structure to a metallic structure, the metal-wire layers were co-cured with composite layers using the Vacuum Assisted Resin Transfer Molding (VARTM). Then, the interface fracture strength was measured for Mode II fracture for various lay-up and interface conditions. The study includes a metal-wire to composite interface, composite to composite interface, and metal-wire to metal-wire interface. In addition, the lay-up orientations of the metal-wires were ... |
|
| Photon Noise in Digital Holographic Detection |
01-Sep-2008 |
16 pages |
| Authors:
Joseph C Marron; COHERENT TECHNOLOGIES INC LOUISVILLE CO
|
| Digital holographic detection is used to measure coherent, complex-valued image or pupil-plane data. With the complex-valued data, one has access to a digital representation of the optical field and therefore can perform advanced functions such as three-dimensional imaging and correction of phase errors imparted by instrumentation or atmospheric turbulence. This paper contains a derivation of the signal to noise ratio specifically for digital holographic detection in the presence of photon ... |
|
| Modeling and Simulation of a Non-Coherent Frequency Shift Keying Transceiver Using a Field Programmable Gate Array (FPGA) |
01-Sep-2008 |
125 pages |
| Authors:
Konstantinos Voskakis; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| In this thesis, the principals of Software Defined Radio are demonstrated by implementing a Binary Frequency Shift Keying (BFSK) receiver-transmitter in a Field Programmable Gate Array (FPGA). After introducing the theory behind the Non- Coherent BFSK demodulation implemented at the receiver, the design of transmitter and receiver is illustrated. The design environment of choice is Mathworks Simulink and Xilinx System Generator, a dedicated library for Mathworks Simulink. The design is ... |
|
| Gold Nanoparticle Contrast Agents in Mammography: A Feasibility Study |
Aug-2008 |
71 pages |
| Authors:
Andrew D A Maidment; PENNSYLVANIA UNIV PHILADELPHIA
|
| The successful translation of molecular imaging to mammography and digital breast tomosynthesis would allow clinical molecular imaging of the breast. This is a potentially more sensitive approach to early breast cancer detection, especially in women at high risk. Bioconjugated gold (Au) nanoparticle (NP) imaging agents, used in conjunction with digital mammography and breast tomosynthesis, should provide improved lesion conspicuity. Au-NP are exceptionally attenuating at mammographic energies; even very low concentrations ... |
|
| Assessment of the Effectiveness of Clay Soil Covers as Engineered Barriers in Waste Disposal Facilities with Emphasis on Modeling Cracking Behavior |
01-Jun-2008 |
109 pages |
| Authors:
Berney; Ernest S IV; Wayne D Hodo; John F Peters; Tommy E Myers; Richard S Olsen; Michael K Sharp; NUCLEAR REGULATORY COMMISSION WASHINGTON DC
|
| Abstract: This research investigated the nature of cracking behavior in compacted clay liners used for nuclear waste disposal facilities. A literature review found that, in all documented in-place clay liner studies, cracking occurred in the clay liner within 10 years, leading to failure of the liner system. Further, all moisture-flow models studied failed to capture clay cracking and the resultant high permeability associated with these failed liner systems. A laboratory ... |
|
| Classification of Digital Modulation Types in Multipath Environments |
Jun-2008 |
83 pages |
| Authors:
Andrew F Young; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| As the digital communications industry continues to grow and evolve, the applications of this discipline continue to grow as well. This growth, in turn, has spawned an increasing need to seek automated methods of classifying digital modulation types. This research is a revision of previous work, using the latest mathematical software including MATLAB version 7 and Simulink(trade name). The program considers the classification of nine different modulation types Specifically, the ... |
|
| Department of the Navy Naval Networking Environment (NNE)-2016. Strategic Definition, Scope and Strategy Paper, Version 1.1 |
13-May-2008 |
35 pages |
| Authors:
NAVAL NETWORKING ENVIRONMENT
|
| The Department of the Navy (DON) Chief Information Officer (CIO) has led the effort to define the vision, scope, strategy, and concept of operations (CONOPS), for the Department of the Navy's future Naval Networking Environment (NNE), in the 2016 timeframe. The information contained in this paper will allow the Department to formulate the strategy behind NNE-2016 that is linked to the warfighting and warfighting support needs of the Department. |
|
| RHEEDAX Induced X-ray Fluorescence Analysis System for Oxide MBE |
MAR 2008 |
3 pages |
| Authors:
Hadis Morkoc; VIRGINIA COMMONWEALTH UNIV RICHMOND SCHOOL OF ENGINEERING
|
| A total reflection x-ray fluorescence spectroscopy system excited with an electron gun of reflection high-energy electron diffraction tool (RHEED-TRAXs) for in Situ material characterization has been designed, components have been purchased, and the tool has been assembled and installed on a Riber 3200 molecular-beam epitaxy system customized for oxide growth. |
|
| A Comparison of Moir Interferometry qnd Digital Image Correlation |
MAR 2008 |
113 pages |
| Authors:
Ryan J. Davidson; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
|
| This research effort studied the effect of subset size and step size on the spatial resolution and accuracy of Digital Image Correlation (DIC). In addition, DIC was compared with moir interferometry in an attempt to give future researchers guidance on which method would be appropriate for their research. Strains fields were calculated from displacement fields measured by each method. The strain fields were then compared. The main findings of the ... |
|
| An Empirical Investigation of Factors Influencing Knowledge Management System Success |
MAR 2008 |
108 pages |
| Authors:
Jr Whitfield John F.; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
|
| Knowledge has been viewed as a critical component for organizations. Consequently, organizations implement Knowledge Management Systems (KMSs) to seek competitive advantages, but they may encounter mixed results. This research draws on previous information system and knowledge management system success-related literature and selects eight factors that are believed to be critical for the successful implementation of a KMS. These factors were derived through a literature search of current KMS success-related literature. ... |
|
| Improved General Technical Score Requirements for Entry-Level 0811 Cannon Crewmen |
19-Feb-2008 |
13 pages |
| Authors:
R D Barnes; MARINE CORPS COMMAND AND STAFF COLL QUANTICO VA
|
| For centuries, artillerymen have dominated the battlefield with kinetic fires. The backbone of Marine Corps artillery are the 0811 Cannoneers, the Marines who have historically operated the howitzers night and day, rain or shine, to provide the fire support needed by maneuver units. For the last 20 years, a cannoneer's job has been fairly straightforward: employ the M198 155mm Medium Towed artillery piece in accordance with the technical manual. However, ... |
|
| Reflective Light Modulation by Cephalopods in Shallow Nearshore Habitats |
Jan-2008 |
|
| Authors:
Roger T Hanlon; MARINE BIOLOGICAL LAB WOODS HOLE MA
|
 | The central question is: what are the optical principles upon which crypsis is achieved by opaque organisms in shallow, nearshore marine habitats? Camouflage mechanisms are not well known despite the general misconception that they are. Moreover, quantification of camouflage (especially of opaque organisms) is particularly wanting. We have three objectives: (1) Acquire imagery (camouflaged animals and their backgrounds) and corresponding irradiance data from coral reef and temperate rock reef environments. ... |
|
| Listener Detection of Talker Stress in Low-Rate Coded Speech |
Jan-2008 |
5 pages |
| Authors:
Stephen Voran; INSTITUTE FOR TELECOMMUNICATION SCIENCES BOULDER CO
|
| We describe an experiment where listeners were asked to detect two specific forms of stress in talkers' recorded voices heard via six different simulated communication systems. Both task-induced stress and dramatized urgency were used. Communication systems included low-rate digital speech coding combined with bit errors, packet loss, and packet loss concealment. Twenty-four listeners participated in a total of 11,520 detection trials. A parallel investigation of word intelligibility in sentence context ... |
|
| Army Communicator. Volume 33, Number 1, Winter 2008 |
Jan-2008 |
49 pages |
| Authors:
ARMY SIGNAL CENTER AND FORT GORDON GA
|
| Army Communicator is an authorized, official quarterly professional bulletin of the U.S. Army Signal Center, Fort Gordon, GA. Topics of articles in this issue include: Electromagnetic Spectrum Operations, Net-Centric Warfare, Spectrum Training, Digital Battlefields, and Operational Warfare. |
|
| Separation Control Using ZNMF Devices: Flow Physics and Scaling Laws |
31 DEC 2007 |
|
| Authors:
Ye Tian; III Cattafesta Louis N.; FLORIDA UNIV GAINESVILLE MECHANICAL AND AEROSPACE ENGINEERING
|
| The primary goal of this research is to implement a closed-loop control system to control separated flow and to evaluate the performance of the controller. A control system that includes an array of actuators, sensors (pressure sensors or lift/drag balance) and a digital controller is proposed to control flow separation in a closed-loop fashion. The first chapter introduces the flow physics and active control approaches of flow separation. It is ... |
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| Integrated Reconfigurable Aperture, Digital Beam Forming, and Software GPS Receiver for UAV Navigation |
11 DEC 2007 |
20 pages |
| Authors:
Y. T. Morton; MIAMI UNIV OXFORD OH
|
| This report describes progress to date on establishing an integrated aperture, digital beam forming, and software receiver for UAV navigation in interference and jamming environment. Current progress has been made in the following areas: (1) implemented both carrier and code phase tracking loop for performance evaluation of a minimum power beam forming algorithm and null steering algorithm (2) Developed a criterion for interference bandwidth classification (3) implemented a multipath mitigation ... |
|
| Exploring the Variable Sky with the Sloan Digital Sky Survey |
DEC 2007 |
17 pages |
| Authors:
Branimir Sesar; Zeljko Ivezic; Robert H. Lupton; Mario Juric; James E. Gunn; Gillian R. Knapp; Nathan De Lee; J. A. Smith; Gajus Miknaitis; Huan Lin; NAVAL OBSERVATORY FLAGSTAFF AZ
|
| We quantify the variability of faint unresolved optical sources using a catalog based on multiple SDSS imaging observations. The catalog covers SDSS stripe 82, which lies along the celestial equator in the southern Galactic hemisphere (22h24m < J2000:0 < 04h08m, 1:27 < J2000:0 < 1:27 , 290 deg2), and contains 34 million photometric observations in the SDSS ugriz system for 748,084 unresolved sources at high Galactic latitudes (b < 20 ... |
|
| A Study of the Seastar Underwater Acoustic Local Area Network Concept |
DEC 2007 |
177 pages |
| Authors:
Bjorn E. Kersten; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| This research considers the "Seastar" concept of an underwater local-area network (LAN) having a central node and multiple peripheral nodes. The concept of operation for the Sea star LAN involves the delivery of large volumes of digital information from the peripheral nodes through direct acoustic communication links to a sophisticated central node for assimilation (e.g., beamforming, fusion). For a design range of 500 meters, link budget analysis in combination with ... |
|
| Temporal Subtraction of Digital Breast Tomosynthesis Images for Improved Mass Detection |
OCT 2007 |
22 pages |
| Authors:
Christina M. Li; DUKE UNIV DURHAM NC
|
| Digital breast tomosynthesis (DBT) strives to overcome the obstacles presented in conventional 2D mammography by taking multiple projections over a fixed angle and reconstructing volumetric data isolates overlying anatomy from in-plane structures and amplify the conspicuity of lesions. Temporal subtraction automates the process of comparative analysis by using two images taken sequentially and subtracting them in order to find temporal discrepancies. The purpose of this project is to determine the ... |
|
| Securing Wireless Local Area Networks with GoC PKI |
OCT 2007 |
58 pages |
| Authors:
J. Spagnolo; D. Cayer; NRNS INC OTTAWA (ONTARIO)
|
| Defence R&D Canada led a project in which a wireless virtual private networking (VPN) architecture was set up in a test bed in the Network Information Operation (NIO) lab for 802.11/a/b/g communications. The goal of this initial work was to aid in developing a security policy for use of wireless local area networks (WLAN) in government enterprise networks. This report presents the results of follow-on work that leverages the Government ... |
|
| Wirelessly Networked Digital Phased Array: Analysis and Development of a Phase Synchronization Concept |
SEP 2007 |
88 pages |
| Authors:
Micael Grahn; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The ongoing research of a wirelessly networked aperstructure digital phased array (WNADPA) at NPS has investigated the possibility of using a distributed opportunistic array for radar, where array elements are placed at any available area of the ship structure. This could give an array that is as large as the ship itself, with 360 degrees coverage. It has advantages in the areas of survivability and adaptability, and the profile of ... |
|
| Transformational Element Level Arrays (TELA) Testbed (Preprint) |
SEP 2007 |
27 pages |
| Authors:
Thomas Dalrymple; Jonathan Buck; Peter Buxa; John McCann; Robert Neidhard; Gary Scalzi; Caleb Shreffler; Dan Spendley; Paul Watson; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH AEROSPACE COMPONENTS AND SUBSYSTEMS TECHNOLOGY
|
| The Air Force is in need of antenna technologies to support surveillance needs in a complex Radio Frequency (RF) environment. Requirements dictate the need to find weak and strong emitters simultaneously over broad bandwidth, while resolving emitter data such as angle of arrival and time of arrival for signal identification and tracking. Previous work at AFRL has resulted in many technologies that support these needs. Many components exist today that ... |
|
| Signal Detection and Frame Synchronization of Multiple Wireless Networking Waveforms |
SEP 2007 |
191 pages |
| Authors:
Keith C. Howaland; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| This thesis investigates the detection, classification, frame synchronization, and demodulation of wireless networking waveforms by a digital receiver. The approach is to develop detection thresholds for wireless networking signals based upon the probability density functions of the signal present or signal absent scenarios. A Neyman-Pearson test is applied to determine decision thresholds and the associated probabilities of detection. With a chosen threshold, MATLAB simulations are run utilizing models developed to ... |
|
| Wireless Networks for Beamforming in Distributed Phased Array Radar |
SEP 2007 |
84 pages |
| Authors:
Jose S. Noris; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The Wirelessly Networked Aperstructure Digital Phased Array Radar (WNADPAR) applies three relatively new concepts: Opportunistic, Aperstructure, and Wirelessly Networked Digital Architecture concepts. Using this approach almost the full length of the ship becomes the aperture of the phased array radar by placing the antenna elements at available open areas and having the power supply as the only wired connection. This thesis research addressed the wireless networking of the full-scale radar ... |
|
| 3D Laser Scanner Data Collection |
SEP 2007 |
31 pages |
| Authors:
Linda P. Dove; Sam S. Jackson; Jerrell R. Ballard; Thomas E. Berry; M. E. Lord; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS ENVIRONMENTAL LAB
|
| The objective of the Countermine Phenomenology Program is to increase the probability of detection and reduce false alarm rates by developing an understanding of the influences of the geo-environmental conditions on relevant mine and improvised explosive device signatures for sensor modalities. This involves the development and demonstration of more robust signal processing algorithms based on geo-environmental impacts. 3D laser scanner data were collected in order to obtain the high-resolution surface ... |
|
| Maritime Surveillance Using a Wideband Hydrophone |
SEP 2007 |
69 pages |
| Authors:
Jason K. Wilson; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Undersea acoustic moderns acquire wideband acoustic time series through an electro-acoustic transducer and use on-board digital signal processing for receiving acoustic communications. These component devices can potentially serve a dual use for passive sensing of radiated acoustic energy from maritime vessels. This thesis examines the characteristic Lloyd's mirror interference pattern present in the acoustic spectrogram of a passing surface target and applies two-path ray theory and waveguide invariant theory to ... |
|
| Vulnerability Analysis of HD Photo Image Viewer Applications |
SEP 2007 |
205 pages |
| Authors:
Clifford C. Juan; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The introduction of Microsoft's new graphics file format, Windows Media Photo, into the mainstream market in 2006 has been one of the most interesting developments in the digital world. The file format, which has since been renamed to HD Photo in November of 2006, is being touted as the successor to the ubiquitous JPEG image format, as well as the eventual de facto standard in the digital photography market. With ... |
|
| An Evaluation of Stereoscopic Digital Mammography for Earlier Detection of Breast Cancer and Reduced Rate of Recall |
AUG 2007 |
24 pages |
| Authors:
David J. Getty; BBNT SOLUTIONS LLC CAMBRIDGE MA
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| The goal of this project is to evaluate, in a screening context, stereoscopic digital mammography versus standard (non-stereo) digital mammography for earlier detection of breast lesions during screening and for reduction in the rate of patient recall for further work-up. As of July 2007, 1093 patients at elevated risk for the development of breast cancer have been enrolled. Each patient receives both a standard screening examination and a stereoscopic screening ... |
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| Obtaining Unique, Comprehensive Deep Seismic Sounding Data Sets for CTBT Monitoring and Broad Seismological Studies |
02 JUL 2007 |
62 pages |
| Authors:
Igor B. Morozov; Elena A. Morozova; Scott B. Smithson; WYOMING UNIV LARAMIE DEPT OF GEOLOGY AND GEOPHYSICS
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| In cooperation with the Center for Geophysical and Geoecological Studies (GEON, Moscow, Russia), the University of Wyoming and now also with the University of Saskatchewan digitized, edited, transferred into standard digital formats, and delivered to public domain seismic records from 12 major Deep Seismic Sounding (DSS) projects acquired in 1970-1980's in the former Soviet Union. The data include 3-component records from 22 Peaceful Nuclear Explosions (PNEs) and over 500 chemical ... |
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Reports by Keyword(s)
DIGITAL SYSTEMS
