| A Nonparametric Approach to Segmentation of Ladar Images |
Dec 2012 |
160 pages |
| Authors:
Eric A Buschelman; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
|
 | The advent of advanced laser radar (ladar) systems that record full-waveform signal data has inspired numerous inquisitions which aspire to extract additional, previously unavailable, information about the illuminated scene from the collected data. The quality of the information, however, is often related to the limitations of the ladar camera used to collect the data. This research project uses full-waveform analysis of ladar signals, and basic principles of optics, to propose ... |
|
| A Computational Comparison of High Strain Rate Strength and Failure Models for Glass |
05 Nov 2012 |
11 pages |
| Authors:
Timothy G Talladay; Douglas W Templeton; ARMY TANK AUTOMOTIVE RESEARCH DEVELOPMENT AND ENGINEERING CENTER WARREN MI
|
| Computational studies are performed using the recent Holmquist-Johnson glass model and the earlier Johnson-Holmquist brittle material model. Although the JH-2 model has been adapted to provide reasonably accurate predictions for soda-lime glass, the Holmquist-Johnson model was developed specifically to replicate the behaviors of glass. Simulations of rod impact on borosilicate glass using these two models are compared to experiments involving impact of mild steel rods and borosilicate glass at ca. ... |
|
| Adoptive Immunotherapy for Epithelial Ovarian Cancer Using T Cells Simultaneously Targeted to Tumor and Tumor-Associated Macrophages |
Nov 2012 |
16 pages |
| Authors:
John Maher; KING'S COLL LONDON (UNITED KINGDOM)
|
| The hypothesis underlying this synergistic partnership award was that immunotherapy of epithelial ovarian carcinoma (EOC) with chimeric antigen receptor (CAR)-expressing T-cells would be potentiated if simultaneous targeting of tumor cells and tumor-associated macrophages (TAM) was achieved. To test this hypothesis, we initially engineered T-cells to express CARs with specificity for MUC1 (expressed by tumor cells) and CSF-1R (expressed both by tumor cells and TAM). In-vitro experiments demonstrated some efficacy of ... |
|
| National Defense Center of Excellence for Industrial Metrology and 3D Imaging |
18 Oct 2012 |
227 pages |
| Authors:
Allen D Hunter; YOUNGSTOWN STATE UNIV OH DEPT OF CHEMISTRY
|
| In this report, are summarized the results from our National Defense Center of Excellence for Industrial Metrology and 3D Imaging project, are discussed our on-going work related to this project, and are outlined some ideas for future activities. |
|
| Ascending Stairway Modeling: A First Step Toward Autonomous Multi-Floor Exploration |
Oct 2012 |
4 pages |
| Authors:
Jeffrey A Delmerico; Jason J Corso; David Baran; Philip David; Julian Ryde; ARMY RESEARCH LAB ADELPHI MD
|
| Many robotics platforms are capable of ascending stairways, but all existing approaches for autonomous stair climbing use stairway detection as a trigger for immediate traversal. In the broader context of autonomous exploration the ability to travel between floors of a building should be compatible with path planning, such that the robot can traverse a stairway at a time that is appropriate to its navigation goals. No system yet presented is ... |
|
| Importance of Virtual Reality to a Controlled Stimulus |
Oct 2012 |
7 pages |
| Authors:
Robert McLay; GENEVA FOUNDATION TACOMA WA
|
| This study is a follow up to two projects, funded by the Office of Naval Research, which demonstrated that Virtual Reality (VR) Exposure Therapy was safe for the treatment of combat PTSD Disorder, and that it worked better than treatment as usual. In this study, we are attempting to discover if the Virtual Reality is actually the active component of the treatment. Participants with PTSD are randomized to receive the ... |
|
| Early Detection of Ovarian Cancer by Molecular Targeted Ultrasound Imaging Together with Serum Markers of Tumor-Associated Nuclear Change and Angiogenesis |
Oct 2012 |
13 pages |
| Authors:
Animesh Barua; RUSH UNIV MEDICAL CENTER CHICAGO IL
|
| One of the most significant barriers to establishing an early ovarian cancer (OVCA) detection test is the difficulty of identifying patients with early stage OVCA. In earlier approaches to develop an early detection test for OVCA, using serum levels of CA- 125, traditional transvaginal ultrasound and their combination did not improve the detection of OVCA remarkably. The limitation of CA-125 is that it is non-specific in detecting OVCA at the ... |
|
| More Diagnosis of Solar Flare Probability from Chromosphere Image Sequences |
28 Sep 2012 |
54 pages |
| Authors:
Donald C Norquist; K S Balasubramaniam; AIR FORCE RESEARCH LAB KIRTLAND AFB NM SPACE VEHICLES DIRECTORATE
|
| This report describes a continuation of the work reported in AFRL-RV-PS-TP-2012-0005. First, we nearly doubled the original set of 46 ISOON H image sequences to 90. Second, the flare probability diagnosis algorithm was modified from the last version in the previous report to use the 1-minute image time change of the leading eigenvectors as predictors, and flaring level indicators prescribed from the whole sequence eigenvector patterns and the x-ray flux ... |
|
| Intelligent Behavioral Action Aiding for Improved Autonomous Image Navigation |
13 Sep 2012 |
111 pages |
| Authors:
Kwee G Eng; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
|
| In egomotion image navigation, errors are common especially when traversing areas with few landmarks. Since image navigation is often used as a passive navigation technique in Global Positioning System (GPS) denied environments; egomotion accuracy is important for precise navigation in these challenging environments. One of the causes of egomotion errors is inaccurate landmark distance measurements, e.g., sensor noise. This research determines a landmark location egomotion error model that quantifies the ... |
|
| Using Multimedia Metadata to Improve Network Efficiency |
Sep 2012 |
50 pages |
| Authors:
Joe D Blocker; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF COMPUTER SCIENCE
|
| A growing amount of multimedia information exists online, and it is commonly referred to as the multimedia explosion. Many research efforts are focused on the concept that computing is ubiquitous and that accessing network resources is not the challenge, but rather finding the right object is. However, America's military and other first responder organizations often find themselves in austere environments where access to high-speed network resources is scarce, users only ... |
|
| Detection of Subpixel Submerged Mine-Like Targets in WorldView-2 Multispectral Imagery |
Sep 2012 |
111 pages |
| Authors:
Michelle R Sandersfeld; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The utility of satellite spectral imagery is analyzed for the detection of submerged mine like objects. The targets that were utilized were sub-meter in size and emplaced in the water off the coast of La Jolla, California for a barnacle study. There were three surface targets and three submerged targets that did not exceed three meters in depth. Two meter multispectral and half meter panchromatic WorldView-2 data were used for ... |
|
| A Submersible Holographic Camera for the Undisturbed Characterization of Optically Relevant Particles in Water (HOLOCAM) |
Sep 2012 |
8 pages |
| Authors:
James M Sullivan; WESTERN ENVIRONMENTAL TECHNOLOGY LABS INC NARRAGANSETT RI
|
| Our long-term goal is to develop novel oceanographic instrumentation to address fundamental questions in ocean optics. The primary goal of this project is to develop a holographic instrument capable of imaging and characterizing natural (i.e. undisturbed) particle fields in the ocean. The longterm science goal is to understand the link between suspended particles and the bulk scattering properties of natural waters. We believe in-situ digital holographic microscopy, recently developed and ... |
|
| An Optical Satellite Tracking System for Undergraduate Research |
Sep 2012 |
10 pages |
| Authors:
Shane Bruski; Michael P Jones; Samuel R Harms; Scott R Dahlke; Neil Thomas; AIR FORCE ACADEMY COLORADO SPRINGS CO
|
| A commercial off-the-shelf satellite tracking system is developed and utilized for determining satellite characteristics on a minimum budget. A summary of the system components, developments, capabilities, and future improvements is addressed within this paper. The system is divided into four main components: camera and lens, tracking mount tracking and data handling computer, and software. The system is highly mobile and has provided usable research data through the imaging of unresolved ... |
|
| A Novel Multivoxel-Based Quantitation of Metabolites and Lipids Noninvasively Combined with Diffusion-Weighted Imaging in Breast Cancer |
Sep 2012 |
47 pages |
| Authors:
Michael A Thomas; CALIFORNIA UNIV LOS ANGELES
|
| i) To extend the single-voxel bas ed 2D MRS version of L-COSY to multi-voxel based analogue on a 3T MRI/MRS scanner using the echo-planar imaging (EPI) based spatial encoding for determining metabolic distributions over many vox els, ii) To implement a Matlab-based post-processing algorithm in order to process the 2D COSY data recorded in breast cancer, iii) To record DWI and to calculate ADC maps in breast cancer patients and ... |
|
| Characterization of Ceramic Composite Materials Using Terahertz Non-Destructive Evaluation Techniques (Preprint) |
Aug 2012 |
5 pages |
| Authors:
Adam Cooney; Lindsay Owens; Jason A Diebel; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH MATERIALS AND MANUFACTURING DIRECTORATE
|
| THz time-domain reflection imaging is utilized as non-destructive evaluation technique for ceramic composite materials in order to characterize changes in material properties due to mechanical and thermal strain effects. |
|
| Integrated Device for Circulating Tumor Cell Capture, Characterization, and Lens-Free Microscopy |
Aug 2012 |
34 pages |
| Authors:
Changhuei Yang; CALIFORNIA INST OF TECH PASADENA
|
| For this project, we aim to develop and integrate two highly innovative new technologies to capture and characterize circulating tumor cells found in the blood of patients with breast cancer. The first is a highly innovative cell capture technology for blood and other body fluids based on a microfluidics microchip technology. The second is an entirely new imaging technology for performing wide field of viewing microscopy imaging. The resulting device ... |
|
| Targeting Cell Surface Proteins in Molecular Photoacoustic Imaging to Detect Ovarian Cancer Early |
Jul 2012 |
7 pages |
| Authors:
Charles Drescher; FRED HUTCHINSON CANCER RESEARCH CENTER SEATTLE WA
|
| Our idea is to apply a series of novel techniques to identify the reagents needed to move imaging technology forward into the clinic. While molecular imaging strategies are now approaching the resolution required to detect ovarian cancer in an early curable stage, specific imaging probes are not currently available and are urgently needed to realize the potential of imaging for ovarian cancer early detection. To address this challenge we are ... |
|
| Analysis of Polarization Mismatch Loss for Horizontal Linear Feature Detection |
12 Jun 2012 |
8 pages |
| Authors:
Mark A Govoni; Jeffrey S Spak; Lee R Moyer; ARMY COMMUNICATIONS-ELECTRONICS RESEARCH DEVELOPMENT AND ENG CTR APG MD
|
| FOR most airborne radar, target detection is possible when the receiver collects target energy in excess of ground clutter and channel noise. Ground clutter is the predominant impediment to successful detection, and is minimized by varying the grazing angle. Extensive literature exists on backscattering statistics for various terrain types [1, 2]. However, little research exists on the significance of aspect angle and its relationship to polarization mismatch loss. Research has ... |
|
| Coherent Distributed Radar for High-Resolution Through-Wall Imaging |
04 Jun 2012 |
25 pages |
| Authors:
Eric van Doorn; Satya Ponnaluri; INTELLIGENT AUTOMATION INC ROCKVILLE MD
|
| The proposed work is in direct support of the Office of Naval Research's Transparent Urban Structures (TUS) program. The objective of the TUS program is to improve the collection, understanding, and dissemination of intelligence for the urban conflict. Through TUS, ONR seeks to develop technology which assists the warfighter in understanding the urban terrain of interest by detecting and classifying threats, both inside buildings and underground, and by maximizing situational ... |
|
| Large Scale Visual Recognition |
Jun 2012 |
162 pages |
| Authors:
Jia Deng; PRINCETON UNIV NJ DEPT OF COMPUTER SCIENCE
|
| Visual recognition remains one of the grand goals of artificial intelligence research. One major challenge is endowing machines with human ability to recognize tens of thousands of categories. Moving beyond previous work that is mostly focused on hundreds of categories we make progress toward human scale visual recognition. Specifically, our contributions are as follows First, we have constructed ImageNet, a large scale image ontology. The Fall 2011 version consists of ... |
|
| Jensen-Bregman LogDet Divergence for Efficient Similarity Computations on Positive Definite Tensors |
02 May 2012 |
31 pages |
| Authors:
Anoop Cherian; Suvrit Sra; Arindam Banerjee; Nikos Papanikolopoulos; MINNESOTA UNIV MINNEAPOLIS DEPT OF COMPUTER SCIENCE AND ENGINEERING
|
| Covariance matrices provide an easy platform for fusing multiple features compactly and as a result have found immense success in several computer vision applications including activity recognition, visual surveillance, and diffusion tensor imaging. An important task in all of these applications is to compute the distance between covariance matrices using a (dis)similarity function, for which the natural choice is the Riemannian metric corresponding to the manifold inhabited by these matrices. ... |
|
| Investigating Architectural Issues in Neuromorphic Computing |
May 2012 |
29 pages |
| Authors:
Robinson E Pino; AIR FORCE RESEARCH LAB ROME NY INFORMATION DIRECTORATE
|
| Our objective is the study of an Intelligent Text Recognition System (ITRS) that mimics the human information processing procedure to fill in the missing or damaged text by considering the word level and sentence level context. The system is built upon two cognitive computing models, the Brain-State-in-a-Box (BSB) Attractor Model and the Cogent Confabulation Model. The former performs character detection and later performs word and sentence completion. Given a scanned ... |
|
| Coronal Cells |
10 Apr 2012 |
15 pages |
| Authors:
Jr Sheeley N R; H P Warren; NAVAL RESEARCH LAB WASHINGTON DC SPACE SCIENCE DIV
|
| We have recently noticed cellular features in Fe xii 193 A images of the 1.2 MK corona. They occur in regions bounded by a coronal hole and a filament channel, and are centered on flux elements of the photospheric magnetic network. Like their neighboring coronal holes, these regions have minority-polarity flux that is 0.1-0.3 times their flux of majority polarity. Consequently, the minority-polarity flux is ?grabbed? by the majority-polarity flux ... |
|
| Images of Bottomside Irregularities Observed at Topside Altitudes (Postprint) |
04 Apr 2012 |
16 pages |
| Authors:
William J Burke; Louise C Gentile; Shannon R Shomo; Patrick A Roddy; Robert F Pfaff; AIR FORCE RESEARCH LAB KIRTLAND AFB NM SPACE VEHICLES DIRECTORATE
|
| We analyzed plasma and field measurements acquired by the Communication/ Navigation Outage Forecasting System (C/NOFS) satellite during an eight-hour period on 13 14 January 2010 when strong to moderate 250 MHz scintillation activity was observed at nearby Scintillation Network Decision Aid (SCINDA) ground stations. C/NOFS consistently detected relatively small-scale density and electric field irregularities embedded within large-scale (_100 km) structures at topside altitudes. Significant spectral power measured at the Fresnel ... |
|
| Methods to Reduce Sand Ejecta from Projectile Impact - a Scaled Study with the Goal of Application to Depleted Uranium Penetrator Catch Boxes |
Apr 2012 |
81 pages |
| Authors:
Victor F Medina; Scott A Waisner; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS ENVIRONMENTAL LAB
|
| Depleted uranium (DU) is used in three penetrator munitions by the U.S. Army, a 25-mm round (M242), 105-mm antitank rounds (M900, M774, M833), and 120-mm antitank rounds (M829, M829A1, M829A2). The last two of these munitions are frequently fired into large catch boxes at two proving grounds Yuma Proving Ground near Yuma, AZ and the Aberdeen Proving Ground, MD. Gamma radiation surveys indicate that during penetrator impact DU ejecta in ... |
|
| Coherent Distributed Radar for High Resolution Through-wall Imaging |
Apr 2012 |
4 pages |
| Authors:
Eric van Doorn; Satya Ponnaluri; INTELLIGENT AUTOMATION INC ROCKVILLE MD
|
| In this performing period, we have focused on radar imaging with the synchronized RF link. Specifically, after synchronizing, we fix the slave node, and move the master node smoothly, collecting raw correlator output continuously. From the starting and stopping time of the master motion, and the known distance, we estimate the relative master and slave positions in 2D (Figure 1). These positions, and the correlator outputs are combined in a ... |
|
| Estimating TC Intensity Using the SSMIS and ATMS Sounders |
Apr 2012 |
6 pages |
| Authors:
Derrick C Herndon; Christopher Velden; Jeffrey Hawkins; WISCONSIN UNIV-MADISON COOPERATIVE INST FOR METEOROLOGICAL SATELLITE STUDIES
|
| Microwave sounders operating in the 53-55 Ghz frequency range are transparent to cloud cover and allow the mapping of the Tropical Cyclone (TC) warm core in the 350-100 hPa layer. A robust relationship exists between the brightness temperature (Tb) anomalies measured by satellites in this layer and aircraft-measured Minimum Sea Level Pressure (MSLP) anomalies. Since 1998 the Advanced Microwave Sounding Unit (AMSU) flown aboard the Polar Orbiting Environmental Satellite (POES) ... |
|
| The Focusing of Light Scattered from Diffuse Reflectors Using Phase Modulation |
22 Mar 2012 |
78 pages |
| Authors:
Jessica Schafer; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
|
| Indirect photography was recently demonstrated for imaging hidden scene information through the collection and radiometric modeling of light reflecting off of visible reflecting surfaces. The ability to focus the beam that reflects off the visible surface to a tight spot on the hidden object is theorized to simulate a direct line of sight from the light source to the object, reducing the radiometric model to that of the previously demonstrated ... |
|
| LADAR Range Image Interpolation Exploiting Pulse Width Expansion |
22 Mar 2012 |
100 pages |
| Authors:
Jeramy W Motes; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT/DEPT OF ENGINEERING PHYSICS
|
| Laser Detection and Ranging (LADAR) systems produce both a range image and an intensity image by measuring the intensity of light reflected off a surface target. When the transmitted LADAR pulse strikes a sloped surface, the returned pulse is expanded temporally. This characteristic of the reflected laser pulse enables the possibility of estimating the gradient of a surface. This study estimates the gradient of the surface of an object from ... |
|
| An Image-Based Method for Modeling the Elasto-Plastic Behavior of Polycrystalline Microstructures Based on the Fast Fourier Transform |
16 Mar 2012 |
55 pages |
| Authors:
Bin Wen; Nicholas Zabaras; SIBLEY SCHOOL OF MECHANICAL AND AEROSPACE ENGINEERING ITHACA NY
|
| An efficient full-field method of computing the local and homogenized macroscopic responses of elasto-plastic polycrystalline microstructures based on the fast Fourier transform (FFT) algorithm is presented. This approach takes realistic microstructure images as the input and estimates the mechanical response/properties of polycrystal microstructures under periodic boundary conditions without requiring complex discretization. Effective stress-strain response, local mechanical response fields and crystallographic texture of deformed microstructures are examined. Special interest is given ... |
|
| Ground Based Synoptic Instrumentation for Solar Observations (Postprint) |
05 Mar 2012 |
22 pages |
| Authors:
K S Balasubramaniam; Alexei Pevtsov; AIR FORCE RESEARCH LAB KIRTLAND AFB NM SPACE VEHICLES DIRECTORATE
|
| We describe the status of current ground-based solar spectroscopic and imaging instruments used in solar observations. We describe the advantages and disadvantages of using these two classes of instruments with examples drawn from the Improved Solar Optical Observing Network (ISOON) and Synoptic Long Term Investigations of the Sun (SOLIS) Network. Besides instrumental requirements and lessons learned from existing ground-based instruments, this talk also focuses on the future needs and requirements ... |
|
| Structure and Spectroscopy of Buried Interfaces in Organic Thin Films and Colloids |
01 Mar 2012 |
7 pages |
| Authors:
Hai-Lung Dai; TEMPLE UNIV PHILADELPHIA PA
|
| A major accomplishment of this project has been that we have resolved nearly all the fundamental problems and demonstrated Second Harmonic Generation as an effective and versatile method for characterizing the solid-liquid interfaces of micron to nanometer size particles buried deep in colloids. We have shown for the first time that SHG from the surface of silver nanoparticles can be detected, and through monitoring the second harmonic light scattering we ... |
|
| Non-Intrusive Media Forensics Framework |
01 Mar 2012 |
20 pages |
| Authors:
K J Liu; MARYLAND UNIV COLLEGE PARK DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| In recent years, the availability of high-quality digital cameras and audio recording devices coupled with the rise of the Internet as a means of information delivery has cause digital content to become prevalent throughout society. Many governmental, legal, scientific, and news media organizations rely on digital multimedia content to make critical decisions or to use as evidence of specific events. This proves to be problematic, as the rise of digital ... |
|
| 3-D Scene Reconstruction from Aerial Imagery |
Mar 2012 |
183 pages |
| Authors:
Jared M Ekholm; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
|
| 3-D scene reconstructions derived from Structure from Motion (SfM) and Multi-View Stereo (MVS) techniques were analyzed to determine the optimal reconnaissance flight characteristics suitable for target reconstruction. In support of this goal, a preliminary study of a simple 3-D geometric object facilitated the analysis of convergence angles and number of camera frames within a controlled environment. Reconstruction accuracy measurements revealed at least 3 camera frames and a 6 convergence angle ... |
|
| Enhanced Image-Aided Navigation Algorithm with Automatic Calibration and Affine Distortion Prediction |
Mar 2012 |
132 pages |
| Authors:
Juan D Jurado; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
|
| This research aims at improving two key steps within the image aided navigation process: camera calibration and landmark tracking. The camera calibration step is improved by automating the point correspondence calculation within the standard camera calibration algorithm, thereby reducing the required time for calibration while maintaining the output model accuracy. The feature landmark tracking step is improved by digitally simulating affine distortions on input images in order to calculate more ... |
|
| Local Histograms for Per-Pixel Classification |
Mar 2012 |
103 pages |
| Authors:
Melody L Massar; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
|
| We introduce a rigorous mathematical theory for the analysis of local histograms, and study how they interact with textures that can be modeled as occlusions of simpler components. We first show how local histograms can be computed as a system of convolutions and discuss some basic local histogram properties. We then introduce a probabilistic, occlusion-based model for textures and formally demonstrate that local histogram transforms are natural tools for analyzing ... |
|
| Coherent Distributed Radar For High-Resolution Through-Wall Imaging |
Mar 2012 |
4 pages |
| Authors:
Eric van Doorn; Satya Ponnaluri; INTELLIGENT AUTOMATION INC ROCKVILLE MD
|
| Radar imaging with synchronized Master and Slave nodes In this performance period, we have processed data for radar imaging. Data were taken near two buildings 15400 Calhoun Drive. Both data sets were processed using a coherent back projection algorithm. |
|
| Targeted Gold Nanoparticle Contrast Agent for Digital Breast Tomosynthesis and Computed Tomography |
Mar 2012 |
20 pages |
| Authors:
Roshan Karunamuni; PENNSYLVANIA UNIV PHILADELPHIA
|
| Targeted imaging agents use specific biomarkers that are present in tumor tissue to distinguish cancerous cells from their immediate benign environment. They are able to provide both structural and functional characteristics of the tumor such as shape, size, growth rate and expression level of cell-surface makers. The research aims to design an imaging platform using targeted gold (Au) nanoparticles (NP) to accurately determine the level of HER2 density in solid ... |
|
| Load-Differential Imaging for Detection and Localization of Fatigue Cracks Using Lamb Waves (Preprint) |
Mar 2012 |
24 pages |
| Authors:
Xin Chen; Jennifer E Michaels; Sang Jun Lee; Thomas E Michaels; GEORGIA TECH RESEARCH CORP ATLANTA
|
| Fatigue cracks are common and potentially critical defects in metallic plate-like structures, and ultrasonic guided wave methods provide an efficient and relatively low-cost means of crack detection and monitoring. However, widely used baseline subtraction methods may fail under mismatched environmental and operational conditions. In particular, varying applied loads change not only the contact state of a crack but also specimen dimensions and wave speeds, which affect the ultrasonic signal response. ... |
|
| Risk-Based Aviation Security: Diffusion and Acceptance |
Mar 2012 |
101 pages |
| Authors:
George M Beech; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF NATIONAL SECURITY AFFAIRS
|
| The Transportation Security Administration (TSA) is continually under public pressure to improve aviation security screening for air passengers while simultaneously protecting the public from all perceived threats to commercial aviation. Applying acceptance models to predict passengers' intentions to use voluntary security programs could lead to more efficient deployment of technology and procedures, or the termination of a security program before significant government resources are dedicated to it. Accelerated adoption rates ... |
|
| Epithelial and Stromal Spectral Imaging for Rapid Surgical Margin Analysis |
Mar 2012 |
18 pages |
| Authors:
Ashley Laughney; Venkataramanan Krishnaswamy; Keith Paulsen; Brian Pogue; DARTMOUTH COLL HANOVER NH
|
| A new, scanning beam spectroscopy platform was developed to dramatically improved image acquisition speed of localized light scattering. The new scanning in situ spectroscopy platform samples broadband reflectance from a 150 microns diameter spot over a 1 sq cm field using a dark field geometry and telecentric lens; the system was designed to balance sensitivity to stromal and epithelial distributions, while sufficiently imaging the inherent diversity within a diagnosis. The ... |
|
| Predicting the Shadow in an Oblique View of a Rectangular Target |
Mar 2012 |
17 pages |
| Authors:
Robert Whatmough; DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION EDINBURGH (AUSTRALIA) INTELLIGENCE SURVEILLANCE AND RECONNAISSANCE DIV
|
| When land or sea targets are sought in an oblique view of a sunlit scene, their shadows may be their most conspicuous features. It is therefore useful to predict how the shadow of a target will appear in the image, given its shape and orientation and the positions of the sun and the camera. This note considers the prediction of the visible shadows of a simple but representative target shape, ... |
|
| Automating Nearshore Bathymetry Extraction from Wave Motion in Satellite Optical Imagery |
Mar 2012 |
117 pages |
| Authors:
Steven Mancini; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Nearshore depths for Waimanalo Beach, HI, are extracted from optical imagery, taken by the WorldView-2 satellite on 31 March 2011, by means of automated wave kinematics bathymetry (WKB). Two sets of three sequential images taken at intervals of about 10 seconds are used for the analyses herein. Water depths are calculated using a computer program that registers the images, estimates the currents, and then uses the linear dispersion relationship for ... |
|
| RI: CCD-FO Assembly for Spectroscopic Characterization of Flame Synthesis Processes |
15 Feb 2012 |
9 pages |
| Authors:
Stephen D Tse; RUTGERS - THE STATE UNIV NEW BRUNSWICK NJ
|
| Funds from the ARO Research Instrumentation (RI) Program were used to upgrade the CCD-fiber-optic assembly of an intensified-CCD (ICCD) detector. The detector is coupled with an imaging spectrometer for use in the on-going ARO project, Novel Flame-Based Synthesis of Nanowires for Multifunctional Application, (Grant W911NF-08-1-0417) on the synthesis of nanowires of MoO3, CuO, WO3, Fe2O3, Bi2O3, and MnO2 for nano-energetic applications involving thermite reactions with nano-Al. Specifically, the CCD-FO component ... |
|
| Coherent Distributed Radar For High Resolution Through-Wall Imaging |
Feb 2012 |
5 pages |
| Authors:
Eric van Doorn; Satya Ponnaluri; INTELLIGENT AUTOMATION INC ROCKVILLE MD
|
| During this period of performance, we concentrated our efforts in the following technical tasks: Integrated I.P. radios to our hardware which enables the master and the save units to communicate with each other wirelessly for data collection Collected coherent data in different node location configurations (indoor, outdoor) for offline processing. |
|
| Flux Pinning Effects of Y2O3 Nanoparticulate Dispersions in Multilayered YBCO Thin Films |
Feb 2012 |
10 pages |
| Authors:
T A Campbell; T J Haugan; P N Barnes; I Maartense; J Murphy; L Brunke; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH PROPULSION DIR/POWER DIV/MECHANICAL ENERGY CONVERSION BRANCH
|
| The flux pinning effects of Y2O3 nanoparticulate inclusions in YBa2Cu3O7-delta (Y123 or YBCO) thin films using (Y2O3/Y123) x N multilayer structures were studied. The multilayer films were made with pulsed laser deposition (PLD) on SrTiO3 and LaAlO3 substrates with a Y2O3 nanoparticulate 'pseudo-layer' thickness ranging from 0.2 to 1.4 nm, and YBCO layer thickness varying from 7 to 50 nm. Scanning electron microscopy images showed well-defined nanoparticle formation on film ... |
|
| Digital Image Correlation of Dynamic Impact Deformation Without Painted Dots Using ProAnalyst 3-D Photogrammetry Software |
Feb 2012 |
20 pages |
| Authors:
Jian H Yu; Peter G Dehmer; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
|
| This report is a user s manual for ProAnalyst 3-D (registered trademark of Xcitex, Inc.) photogrammetry for high-speed impact deformation. ProAnalyst 3-D is a noncontact measurement system that calculates geometric properties, such as angle, depth, and length. The software can render a series of stereo images into three-dimensional displacement vectors as functions of time. Unlike other photogrammetric systems, ProAnalyst 3-D does not require the application of a pattern to the ... |
|
| New Methods of Low-Field Magnetic Resonance Imaging for Application to Traumatic Brain Injury |
Feb 2012 |
24 pages |
| Authors:
Matthew Rosen; HARVARD COLL CAMBRIDGE MA
|
| We have been developing robust low-magnetic-field implementations of MRI (LFI) focused on brain imaging. In particular we have expanded our development of the LFI test bed to include two complimentary approaches: electromagnet and permanent magnet based test bed scanner systems. We are also developing injury-sensitive MRI based on converting the electron spin of free radicals associated with injury into nuclear polarization using the Overhauser effect and subsequently imaging that modified ... |
|
| Face Recognition Performance: Role of Demographic Information |
Jan 2012 |
15 pages |
| Authors:
Brendan F Klare; Mark J Burge; Joshua C Klontz; Richard W Vorder Bruegge; Anil K Jain; MITRE CORP MCLEAN VA
|
| This paper studies the influence of demographics on the performance of face recognition algorithms. The recognition accuracies of six different face recognition algorithms (three commercial, two non-trainable, and one trainable) are computed on a large scale gallery that is partitioned so that each partition consists entirely of specific demographic cohorts. Eight total cohorts are isolated based on gender (male and female) race/ethnicity (Black, White, and Hispanic), and age group (18 ... |
|
| The Future of Air Force Motion Imagery Exploitation: Lessons from the Commercial World |
Jan 2012 |
70 pages |
| Authors:
Lance Menthe; Amada Cordova; Carl Rhodes; Rachel Costello; Jeffrey Sullivan; RAND PROJECT AIR FORCE SANTA MONICA CA
|
| Dramatic changes in the security environment in the past two decades have led to a greatly increased demand for U.S. Air Force intelligence, surveillance, and reconnaissance (ISR) capabilities. Today, the Air Force must provide ISR to a growing set of missions, from the global fight against terrorist organizations to humanitarian relief efforts around the globe, while remaining postured to support major combat operations should the need arise. To meet these ... |
|
Reports by Keyword(s)
IMAGES
