| Implementation and Analysis of a Threat Model for IPv6 Host Autoconfiguration |
SEP 2006 |
105 pages |
| Authors:
Savvas Chozos; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
 | IPv6, the successor of IPv4, introduces the stateless autoconfiguration feature as a convenient alternative to the Dynamic Host Configuration Protocol (DHCP). However, the security implications of this new approach have only been discussed at the conceptual level. This thesis research develops software based on the open-source packet capture library Jpcap to capture and build appropriate ICMPv6 autoconfiguration messages. The developed Java software is used to implement two DoS threats to ... |
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| Modeling Impacts for Cold-Gas Dynamic Spray |
SEP 2006 |
32 pages |
| Authors:
William S. De Rosset; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| A one-dimensional penetration model has been developed to analyze the cold-gas dynamic spray process in hopes of establishing a constant minimum normalized penetration depth for particle adhesion. The simple model was in disagreement with results extrapolated from published copper-on-steel impact data. Possible reasons for the disagreement are discussed. A possible bonding mechanism is proposed that is dependent on the flow properties of both the particle and substrate. |
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| Operational Manning Considerations for Spartan Scout and Sea Fox Unmanned Surface Vehicles (USV) |
SEP 2006 |
94 pages |
| Authors:
Matthew Richter; NAVAL POSTGRADUATE SCHOOL MONTEREY CA GRADUATE SCHOOL OF BUSINESS AND PUBLIC POLICY
|
| This research was conducted in association with Naval Warfare Development Command (NWDC) requests to update Unmanned Vehicle Tactical Memorandum TM-3-22-5-SW. The research identified and discussed significant USV manning considerations such as source ratings and manpower qualities to pilot, operate sensors, support USV electronics, and the manpower implications associated with various weapons systems alternatives. In addition, this research described several existing and notional USV tactics, as well as a discussion about ... |
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| Dynamic Response of an Alternative Tissue Simulant, Physically Associating Gels (PAG) |
SEP 2006 |
14 pages |
| Authors:
Paul Moy; Tusit Weerasooriya; Thomas F. Juliano; Mark R. VanLandingham; Wayne Chen; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| Recent work on formulating alternatives to ballistic gelatin, a soft tissue simulant, has lead to the development of physically associating gels (PAG). Ballistic gelatin impact response has been traditionally used to test and evaluate firearms and bullets but it does have some drawbacks, such as lacking consistency in its viscoelastic properties due to variability during the fabrication process, short shelf-life, and deterioration under prolonged usage at room temperature. PAG offers ... |
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| Graph Theoretical Analysis of Network Centric Operations Using Multi-Layer Models |
SEP 2006 |
94 pages |
| Authors:
Ann Wong-Jiru; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| As the Department of Defense continues its transformations to a network centric force, evaluating DoD's progression towards net-centricity remains a challenge. This research proposes to extend the Network Centric Operation Common Framework Version 2.0 (draft) with the metrics based in graph theory and, specifically addresses, among other metrics, the measurement of a net-centric force's mission effectiveness. The research incorporates the importance of understanding network topology for evaluating an environment for ... |
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| Development of a Low-Latency, High Data Rate, Differential GPS Relative Positioning System for UAV Formation Flight Control |
SEP 2006 |
131 pages |
| Authors:
Stephen J. Comstock; AIR FORCE INST OF TECHNOLOGY WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
|
| In order for Unmanned Aerial Vehicles (UAVs) to be able to fly missions currently performed by manned aircraft, they must be able to conduct in-flight refueling. Additionally, significant fuel savings can be realized if multiple UAV's are able to fly in precise formation and align wingtip vortices. In either case. the precise relative position between the aircraft must be known to an accuracy of only a few centimeters. Previous research ... |
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| Modeling Dynamic Plasticity and Spall Fracture in High Density Polycrystalline Alloys |
SEP 2006 |
34 pages |
| Authors:
J. D. Clayton; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
|
| The dynamic thermomechanical response of a tungsten heavy alloy is investigated via modeling and numerical simulation. The material of study consists of relatively stiff pure tungsten grains embedded within a more ductile matrix alloy comprised of tungsten, nickel, and iron. Constitutive models implemented for each phase account for finite deformation, heat conduction, plastic anisotropy, strain-rate dependence of flow stress, thermal softening, and thermoelastic coupling. The potentially nonlinear volumetric response in ... |
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| Predicting Sediment Transport Dynamics in Ephemeral Channels: A Review of Literature |
SEP 2006 |
9 pages |
| Authors:
Stephen H. Scott; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS COASTAL AND HYDRAULICS LAB
|
| The goal of this Coastal and Hydraulics Engineering Technical Note (CHETN) is to evaluate state-of-the-art research efforts concerning predicting sediment transport in desert ephemeral channels. The present day methods used to predict sediment transport were primarily formulated for application to perennial flow channels. Additionally, in the development of sediment transport relationships it is assumed that the sediment and water mixture is Newtonian, i.e., a linear relationship exists between the shear ... |
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| Feedback Control for Aerodynamics (Preprint) |
SEP 2006 |
14 pages |
| Authors:
R. C. Camphouse; Seddik M. Djouadi; James H. Myatt; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH AIR VEHICLES DIRECTORATE
|
| The two-dimensional Burgers equation is used as a surrogate for the governing equations to test order-reduction and control design approaches. This scalar equation is selected because it has a nonlinearity that is similar to the Navier-Stokes equation, but it can be accurately simulated using far fewer states. However, the number of states required is still well above that for which a controller can be designed directly. Two approaches for order ... |
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| Time-Accurate Computations of Free-Flight Aerodynamics of a Spinning Projectile With and Without Flow Control |
SEP 2006 |
31 pages |
| Authors:
Jubaraj Sahu; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
|
| This report describes a new multi-disciplinary computational study undertaken to compute the flight trajectories and simultaneously predict the unsteady free flight aerodynamics of a spinning projectile configuration with and without aerodynamic flow control. Actual flight trajectories are computed with an advanced coupled computational fluid dynamics (CFD)-rigid body dynamics (RBD) technique. An advanced time-accurate Navier-Stokes computational technique has been used in CFD to compute the unsteady aerodynamics associated with the free ... |
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| Analytic and Computational Studies on Micro-Propulsion and Micro-detonics |
22 AUG 2006 |
12 pages |
| Authors:
Mark Short; D. S. Stewart; ILLINOIS UNIV AT URBANA DEPT OF THEORETICAL AND APPLIED MECHANICS
|
| The Principal Investigators were funded by the AFOSR to conduct several theoretical investigations on aspects of micro-propulsion and micro-detonics technology. These included: (i) An examination of unsteady inert and reactive flows in rectangular and cylindrical channels with side- and end-wall mass injection intended as a model of micro-size rocket thrusters. (ii) An investigation of two issues associated with developing small-scale pulsed detonation wave engines. These concern the dynamics and criticality ... |
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| Inverse Problems and Model Validation: An Example from Latent Virus Reactivation |
15 AUG 2006 |
18 pages |
| Authors:
H. T. Banks; G. M. Kepler; Hoan K. Nguyen; J. Webster-Cyriaque; NORTH CAROLINA STATE UNIV AT RALEIGH CENTER FOR RESEARCH IN SCIENTIFIC COMPUTATION
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| We consider a least squares inverse problem with a model for inducer-mediated reactivation of latent viruses. We illustrate the difficulties associated with the lack of sufficient data (quantity as well as form) in such problems. The modeling and estimation efforts described suggest new experiments as well as needed model extensions. |
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| Cooperative Control of Distributed Autonomous Vehicles in Adversarial Environments |
14 AUG 2006 |
11 pages |
| Authors:
Jeff Shamma; CALIFORNIA UNIV LOS ANGELES DEPT OF MECHANICAL AND AEROSPACE ENGINEERING
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| The goal of this MURI project is to develop the tools required for the systematic design of cooperative control systems for distributed vehicles in adversarial environments. The project is a collaborative effort between the participating institutions of Caltech, Cornell, MIT, and UCLA. The following ``dimensions'' of cooperative control offer an effective breakdown of the cooperative control landsacpe: 1) Distributed control and computation, 2) Adversarial interactions, 3) Uncertain evolution, and 4) ... |
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| Adaptive Architectures for Effects Based Operations |
12 AUG 2006 |
118 pages |
| Authors:
Alexendar H. Levis; GEORGE MASON UNIV FAIRFAX VA
|
| The report documents the research on adaptive architectures for effects based operations. The objectives were to provide a predictive capability against transnational threats and to expand the capability of tools for developing courses of action that include both kinetic and non kinetic actions. The theory and algorithms of Influence nets were developed further to include timed influence nets and dynamic influence nets. The research results were implemented in a tool ... |
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| Optimization-Based Robust Nonlinear Control |
01 AUG 2006 |
18 pages |
| Authors:
Andrew R. Teel; CALIFORNIA UNIV BERKELEY DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
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| New control algorithms were developed for robust stabilization of nonlinear dynamical systems. Novel, linear matrix inequality-based synthesis algorithms were developed for the anti-windup problem. Results were extended so that they are applicable to all stabilizable linear systems with input saturation. New insights into the closed-loop behavior of model predictive control were discovered. It was shown that certain model predictive control algorithms induce stability without any robustness. Then it was shown ... |
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| Comparison of Army Hand and Arm Signals to a Covert Tactile Communication System in a Dynamic Environment |
AUG 2006 |
46 pages |
| Authors:
Rodger A. Pettitt; Elizabeth S. Redden; Christian B. Carstens; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
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| This study was conducted jointly by the U.S. Army Research Laboratory and the University of Central Florida. The purpose of this experiment was to evaluate Soldiers abilities to interpret and respond to tactile commands compared to their abilities to interpret and respond to standard visual hand and arm signals given from leaders in front of and behind them during movement. The tactile belt, developed by UCF, consists of eight tactors ... |
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| Dynamics and Control of Tethered Satellite Formations for the Purpose of Space-Based Remote Sensing |
AUG 2006 |
296 pages |
| Authors:
Kurt A. Vogel; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| This dissertation assesses the utility of tethered satellite formations for the space-based remote sensing mission. Energy dissipation is found to have an adverse effect on foundational rigid body (Likins-Pringle) equilibria. It is shown that a continuously earth-facing equilibrium condition for a fixed-length tethered system does not exist since the spin rate required for the proper precession would not be high enough to maintain tether tension. The range of required spin ... |
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| Simulation Development for Dynamic Situation Awareness and Prediction II |
AUG 2006 |
51 pages |
| Authors:
Kevin C. Trott; NORTHROP GRUMMAN CORP ROME NY DEFENSE MISSION SYSTEMS
|
| The objective of this effort was to create a closed-loop simulation environment in which detailed mission plans can be developed, used as input to a set of distributed simulations, and be executed within the simulation environment. These simulations provide feedback to prototype C4ISR systems in the form of mission status reports, sensor tracks, and other ISR mission results reports, which can be used to maintain situation awareness and to dynamically ... |
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| Novel Molecular Interactions and Biological Functions of the Neurofibromatosis 2 Tumor Suppressor Protein, Merlin |
AUG 2006 |
59 pages |
| Authors:
Olli Carpen; HELSINKI UNIV (FINLAND)
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| The project studies molecular functions of neurofibromatosis 2 tumor suppressor protein merlin and compares the role of phosphorylation in regulation of merlin and structurally related ezrin. The role of different importin subunits in nuclear targeting of merlin was tested. Merlin bound several importin subunits in a non-selective manner. Merlin was shown to bind tubulin via two different rngions one located in the FERM-domain and one at the C-terminus. Intramolecular association ... |
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| Mixing Dynamics of Supercritical Droplets and Jets (Revised To Include Appendices) |
AUG 2006 |
375 pages |
| Authors:
D. G. Talley; R. K. Cohn; E. B. Coy; B. Chehroudi; D. W. Davis; AIR FORCE RESEARCH LAB EDWARDS AFB CA SPACE AND MISSILE PROPULSION DIV
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| This report summarizes a research program to understand the mixing dynamics of supercritical droplets and jets. The research was motivated by the recognition that pressures in modern liquid rocket engine combustion chambers tend to be higher than the critical pressure of one or more of the propellants. Prior to the beginning of this research, combustion processes were largely modeled using low pressure, subcritical spray combustion concepts. At supercritical pressures, however, ... |
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| Stochastic Resonance in Signal Detection and Human Perception |
05 JUL 2006 |
|
| Authors:
James H. Michels; Hao Chen; Pramod K. Varshney; Steven M. Kay; JHM TECHNOLOGIES ITHACA NEW YORK
|
 | Stochastic Resonance (SR) is a nonlinear phenomenon first reported in terms of a nonlinear dynamic effect. The important question of what type of noise to be added has until recently evaded a solution. This issue is addressed directly and a fundamental theoretical framework is developed leading to a determination of the optima! additive SR noise to achieve maximum probability of detection subject to the constraint that the probability of false ... |
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| A Method for Dynamic Configuration of a Cognitive Radio |
JUL 2006 |
7 pages |
| Authors:
Troy B. Weingart; Douglas C. Sicker; Dirk Grunwald; COLORADO UNIV AT BOULDER DEPT OF COMPUTER SCIENCE
|
| Cognitive radios offer a broad range of opportunities for improving the me and utilization of radio frequency spectrum, they also offer a host of exciting prospects in networking research. This includes the creation of radio networks that can reconfigure their operation based on application requirements, policy updates and environmental conditions. Such reconfiguration requires an understanding of cross-layer interactions within the network protocol stack. It also requires the development of algorithms ... |
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| U.S. Army War College: Key Strategic Issues List |
JUL 2006 |
76 pages |
| Authors:
ARMY WAR COLL STRATEGIC STUDIES INST CARLISLE BARRACKS PA
|
| In today's dynamic strategic environment, political changes can become challenges very quickly. Yet, the gravity of major undertakings such as Operation IRAQI FREEDOM can cause us to overlook other significant events or developments. Any list of key strategic issues must, therefore, include the broadest array of regional and functional concerns. The Key Strategic Issues List (KSIL), published annually by the Strategic Studies Institute (SSI) at the U.S. Army War College, ... |
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| Epigenetic Silencing and Resistance to Imatinib Mesylate in CML |
JUL 2006 |
16 pages |
| Authors:
Jean-Pierre Issa; M D ANDERSON CANCER CENTER HOUSTON TX
|
| Resistance to Imatinib mesylate is emerging as a real clinical problem in the management of chronic myelogenous leukemia (CML). In this project we are exploring the hypothesis that epigenetic silencing associated with promoter DNA methylation mediates resistance in selected cases and that reversal of silencing by decitabine-induced hypomethylation can be of therapeutic benefit in CML. In progress to date we have identified samples from patients with CML prior to Imatinib ... |
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| Multiscale Modeling and Simulation of Material Processing |
JUL 2006 |
224 pages |
| Authors:
Ranga Komanduri; Hongbing Lu; Lionel Raff; Samit Roy; OKLAHOMA STATE UNIV STILLWATER SCHOOL OF MECHANICAL AND AEROSPACE ENGINEERING
|
| This project is on the development of scaling laws for multiscale simulations from atomistic to continuum using material testing techniques, such as tension and indentation. The main objective is to address critical issues involved in modeling. Specific problems addressed in this project are: (1) Multiscale simulation from atomistic to continuum via mesoplasticity by coupling molecular dynamics with the material point method in microtensile testing and nanoindentation. (2) Material behavior at ... |
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| Reduced Order Modeling for Aero-Elastic Simulations |
JUL 2006 |
11 pages |
| Authors:
Mark Balas; WYOMING UNIV LARAMIE DEPT OF ELECTRICAL ENGINEERING
|
| Control of systems described by large-order models typically requires construction and use of reduced order models (ROM's) for the purpose of feedback controller design and implementation. However, controllers based on these ROM's can have deleterious interactions with un-modeled modes, and some sort of stability compensation is needed, such as Residual Mode Filters (RMF's). In this report we summarize our work on exponential closed loop stability using RMF's for Aero-Elastic Simulations. ... |
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| O+HCI Cross Sections and Reaction Probabilities in DSMC |
28 JUN 2006 |
7 pages |
| Authors:
Takashi Ozawa; D. A. Levin; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE
|
| A chemical reaction model, suitable for use in the Direct Simulation Monte Carlo (DSMC) method, is developed to simulate hypervelocity collisions of an important reaction in atmospheric-jet interactions ? O(3P)+HCI(1Σ+) → OH(2Π)+C1(2P). The model utilizes the Quasi-Classical Trajectory (QCT) method with two potential energy surfaces (PES), new benchmark triple A″ and A′ surfaces [1] and London-Eyring-Polanyi-Sato (LEPS) PES.[2] The sensitivity of the flow to the fidelity of the chemical model ... |
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| The Rosetta Project: Measuring National Differences |
27 JUN 2006 |
50 pages |
| Authors:
Helen A. Klein; Mei-Hua Lin; Mark Radford; Takahiko Masuda; InCheol Choi; WRIGHT STATE UNIV DAYTON OH
|
| Cross cultural difficulties with coordination, communication, planning, and decision making highlight the limitations of current research in psychology. What is labeled "psychology" is actually "Western psychology" rather than human psychology. Researchers, subjects, and paradigms are primarily from Western nations and outcomes often do not generalize to other samples. Practitioners in many applied domains lack the information and constructs they need take the perspectives of others during international interchanges. While the ... |
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| Characterisation of Narrowband HF Channels in the Mid and Low Latitude Ionosphere |
01 JUN 2006 |
|
| Authors:
T. J. Harris; M. L. Scholz; DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION EDINBURGH (AUSTRALIA)
|
| The performance of an HF digital radio system is strongly affected by the response of its various protocols to short-term (sub-hourly) variations in the ionosphere. There is a very limited choice of models of this variation. Channel simulators based on the Watterson 2-path model (ITU-R F.1487) are commonly relied upon for modem testing, system design and modelling. Limited DSTO trials in the past have cast doubt on the validity of ... |
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| Concurrent MR-NIR Imaging for Breast Cancer Diagnosis |
01 JUN 2006 |
151 pages |
| Authors:
Birsen Yazici; RENSSELAER POLYTECHNIC INST TROY NY
|
| The primary objective of this research program is to investigate concurrent near infrared (NIR) optical and magnetic resonance (MR) imaging for breast cancer diagnosis. The NIR diffuse optical imaging offers novel criteria for cancer differentiation with the ability to measure (in vivo) oxygenation and vascularization state, the uptake and release of contrast agents and chromophore concentrations with high sensitivity. However, NIR diffuse optical tomography is inherently a low spatial resolution ... |
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| M433 Center of Mass Location Throughout Fuze Arming Cycle |
JUN 2006 |
17 pages |
| Authors:
Adam M. Jacob; ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER PICATINNY ARSENAL NJ
|
| The effects on the center of gravity of the M433 4O-mm round due to the arming of its M550 fuze while in flight were studied. The results of this study would be used to assist in determining whether this center of gravity change contributes to instabilities during the round's flight. The study was performed using dynamic simulation software. A virtual model of the M433 round was built, and the location ... |
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| Evaluation of Causes of Large 96-H and 120-H Track Errors in the Western North Pacific |
JUN 2006 |
109 pages |
| Authors:
Kathryn A. Payne; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Whereas the Joint Typhoon Warning Center (JTWC) has ten track forecasts to 72 h, only four dynamical model forecasts are available at 96 h and 120 h. Forming a selective consensus (SCON) by proper removal of a likely erroneous track forecast is hypothesized to be more accurate than the non-selective consensus (NCON) of all four models. Conceptual models describing large track error mechanisms, which are related to known tropical cyclone ... |
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| Dynamic Nonlinear Bending and Torsion of a Cantilever Beam |
JUN 2006 |
62 pages |
| Authors:
Michael S. Whiting; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
|
| This effort sought to measure the dynamic nonlinear bending and torsion response of a cantilever beam. The natural frequencies of a cantilever beam in both chord and flap directions were measured at different static root pitch angles with varying levels of weights attached at the free end. The results were compared with previous experimentation to validate the data and testing procedures while lowering the associated error bands. Additionally, methodology for ... |
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| High Cycle Fatigue Prediction for Mistuned Bladed Disks with Fully Coupled Fluid-Structural Interaction |
JUN 2006 |
138 pages |
| Authors:
Ge-Chenga Zha; Ming-Ta Yang; Fariba Fahroo; MIAMI UNIV CORAL GABLES FL DEPT OF MECHANICAL ENGINEERING
|
| During the period from April 2003 to March 2006, this research had been progressing well as planned toward the ultimate goal of simulating the mistuned rotor with fully-coupled fluid structure interaction. This is multidisciplinary comprehensive project that needs components from both fluid and structure dynamics. |
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| Flight Simulation of a 3 gram Autonomous Glider |
24 MAY 2006 |
61 pages |
| Authors:
Jon P. Entwistle; CALIFORNIA UNIV BERKELEY DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
|
| The Microglider project at UC Berkeley aims at designing an autonomous, palmsized glider to serve as a test-bed for minimum sensor flight control. In order to quickly test and refine the flight control strategies of the microglider, a software tool is presented here which simulates the microglider in flight. The simulated glider is tested using ocelli and optical flow sensors, and a discrete motion control strategy is designed and refined. ... |
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| Standby Power Management Architecture for Deep-Submicron Systems |
19 MAY 2006 |
147 pages |
| Authors:
Michael A. Sheets; CALIFORNIA UNIV BERKELEY DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
|
| In deep-submicron processes a significant portion of the power budget is lost in standby power due to increasing leakage effects. For systems that have long idle times punctuated by bursts of activity, such as PDAs, cell-phones, and wireless sensor networks nodes, this standby power consumption reduces the effectiveness of duty-cycling. This work surveys a number of subthreshold leakage reduction techniques and identifies supply rail gating "MTCMOS" as the most promising. ... |
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| Deconstructing the Tower of Babel: Conflict and Opportunities in the Interagency Process |
16 MAY 2006 |
23 pages |
| Authors:
Stephen P. Corcoran; NAVAL WAR COLL NEWPORT RI JOINT MILITARY OPERATIONS DEPT
|
| The interagency process as it currently exists today requires a new approach to enable the United States to bring all the elements of national power to bear on strategic objectives. The current construct of the National Security Council performs adequately at identifying American interests and developing coordinated policy across the expanse of government. However, past experiences (9/11, Afghanistan, Iraq and Hurricane Katrina) has illustrated that there is a disconnect in ... |
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| Sense and Respond Logistics: The Future of Warfighter Support |
09-May-2006 |
55 pages |
| Authors:
Brett Andrews; DEFENSE ACQUISITION UNIV WEST REGION SAN DIEGO CA
|
| Sense and response logistics is a transformational network-centric, knowledge-driven concept that enables joint effects based operations and provides precise, agile support. Sense and Response Logistics relies upon highly adaptive, self-synchronizing, and dynamic physical and functional processes. It predicts, anticipates, and coordinates actions that provide competitive advantage across the full range of military operations. |
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| A Detailed Study Of Polar Cap Ionospheric Dynamics By Multi-Instrument Techniques |
05 MAY 2006 |
32 pages |
| Authors:
Joran Moen; OSLO UNIV (NORWAY) DEPT OF PHYSICS
|
| This report results from a contract tasking University of Oslo as follows: The Grantee will investigate ionospheric polar plasma patches using a detailed study of polar cap ionospheric dynamics using multi-instrument methods. |
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| Computerized Interpretation of Dynamic Breast MRI |
MAY 2006 |
52 pages |
| Authors:
Weijie Chen; CHICAGO UNIV IL
|
| In the past three years we have investigated computerized methods for analyses and interpretation of breast MR images. We investigated an automatic method for correcting intensity inhomogenieity artifacts in breast MR images. We developed a fuzzy c-means (FOM) based method for 3D lesion segmentation which is a key procedure in computerized interpretation of breast MR images including differential diagnosis and assessment of response to therapy. The computerized segmentation yielded 07% ... |
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| Manipulation of NF-KappaB Activity in the Macrophage Lineage as a Novel Therapeutic Approach |
MAY 2006 |
79 pages |
| Authors:
Fiona Yull; VANDERBILT UNIV MEDICAL CENTER NASHVILLE TN
|
| Morphogenesis of the mammary gland is a highly complex process which when misregulated can result in tumorigenesis. It involves the interactions of multiple cell types in a highly regulated manner with complex signal transduction pathways coordinating the physiological processes. Interactions between epithelial and mesenchymal cells are known to be important. However, recent studies are beginning to highlight the importance of other cell types, such as macrophages. One of the signaling ... |
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| Managing Tipping Point Dynamics in Single Development Projects |
30-Apr-2006 |
43 pages |
| Authors:
David N Ford; Tim Taylor; NAVAL POSTGRADUATE SCHOOL MONTEREY CA GRADUATE SCHOOL OF BUSINESS AND PUBLIC POLICY
|
| Previous system dynamics work models the tipping of a series of product development projects into fire-fighting mode in which rework overwhelms progress. Similar dynamics also threaten the performance of individual development projects. The current work extends previous tipping point dynamics research to single projects and demonstrates how a simple, common feed-back structure can cause complex tipping point dynamics, trap projects in deteriorating modes of behavior, and cause projects to fail. ... |
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| Maneuvering Performance of Autonomous Underwater Vehicles |
28 APR 2006 |
|
| Authors:
Franz S. Hover; MASSACHUSETTS INST OF TECH CAMBRIDGE
|
| High-fidelity linear pitch and yaw dynamic models were developed for a class of autonomous underwater vehicles manufactured by Bluefin Robotics Corporation, based on analysis and field data. Classical control design was then carried out and successfully tested. An algorithm for automatic identification of these models, followed by automatic specification of gains, was developed and delivered to Bluefin. We also created modeling and control schemes for the ONR hovering autonomous underwater ... |
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| Study of Carrier Dynamics in Self-Assembled InAs QDs and InAs/InGaSb Superlattices Using Pump Probe Spectroscopy |
26 APR 2006 |
12 pages |
| Authors:
Sanjay Krishna; NEW MEXICO UNIV ALBUQUERQUE CENTER FOR HIGH TECHNOLOGY MATERIALS
|
| The proposed project aims to investigate the carrier dynamics in two systems that are emerging as a promising candidates for mid-wave infrared (MWIR) and long-wave infrared (LWIR) detectors, namely, self assembled InAs/InGaAs quantum dots and InAs/InGaSb strain layer superlattice. In addition to this, a third material system, metamorphically grown "Arsenic Free" (In,Al,Ga)Sb/GaSb materials will also be investigated. The proposed duration of the project is three years. In this period (1 ... |
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| Combined Singularity Avoidance for Variable Speed Control Moment Gyroscope Clusters |
18 APR 2006 |
16 pages |
| Authors:
David J. Richie; Vaios J. Lappas; Sajjad Asghar; Phil L. Palmer; SURREY UNIV GUILDFORD (UNITED KINGDOM)
|
| Variable Speed Control Moment Gyroscopes (VSCMGs), defined by Schaub in [1], effectively applied to combined energy storage and attitude control in [2,3], and further studied by Yoon and Tsiotras in [4,5], can avoid attitude singularities by varying wheel speed. However, this device's key advantage lies in torque amplification via gimballing (i.e. operating in its CMG mode). The primary limitation of this CMG mode, though, is the existence of gimbal-lock singularity ... |
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| Gravity Waves in Idealized MM5 Simulations |
15 APR 2006 |
29 pages |
| Authors:
Susan A. Triantafillou; ATMOSPHERIC AND ENVIRONMENTAL RESEARCH INC LEXINGTON MA
|
| Propagation and dissipation of gravity waves in the NCAR/Penn State Mesoscale Model (MM5) are studied using numerical experiment, numerical analysis, and established theory. The waves, which are due to a small, fixed-frequency disturbance in an idealized atmosphere, form beams in an X shaped pattern known as St. Andrew's Cross. This choice of problem is accompanied by a theory, supported by physical experiment, and it allows the MM5 wave propagation by ... |
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| Research on Nonlinear Dynamics with Defense Applications |
APR 2006 |
16 pages |
| Authors:
Ying-Cheng Lai; ARIZONA STATE UNIV TEMPE
|
| The objectives of this project are: (1) inducing chaos in electronic circuits, and (2) anti-jamming with stochastic resonance. In close collaboration with AFRL scientists, we developed a general scheme to experimentally induce robust chaotic attractors in electronic circuits (Objective 1). For Objective 2, we discovered a measure to characterize stochastic resonance that has much higher sensitivity to noise variations than all existing measures. We expect it to be useful in ... |
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| Modelling the Effects of Information Campaigns Using Agent-Based Simulation |
APR 2006 |
|
| Authors:
Tony Wragg; DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION EDINBURGH (AUSTRALIA) COMMAND AND CONTROL DIV
|
| Recent military operations in Afghanistan and Iraq have demonstrated the importance of understanding the social processes and power dynamics of local populations. The goal of this study was to simulate the process of social influence within a population using dynamic social impact theory. The simulations reproduced the characteristics of social influence such as opinion- clustering, opinion polarization, minority opinion decay, and the non-linearity of public opinion change. The study demonstrated ... |
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| Effect of a High Bone Turnover State Induced by Estrogen Deficiency on the Development and Progression of Breast Cancer Bone Metastases |
APR 2006 |
45 pages |
| Authors:
Wende M. Kozlow; VIRGINIA UNIV CHARLOTTESVILLE
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| Aromatase inhibitors (AIs), effective treatment for breast cancer, block estrogen synthesis. Increased bone resorption and decreased bone mineral density (BMD) are predicted consequences. We hypothesized that bisphosphonates (BPs) may prevent bone loss from AI therapy. Four-week-old female nude mice were treated with letrozole (10 mcg/d), zoledronic acid (ZA) (5 mcg/kg twice weekly), letrozole + ZA or control. Mice treated with letrozole alone had lower BMD compared to control (p |
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| Muzzle Exit (Set Forward) Effects on Projectile Dynamics |
APR 2006 |
14 pages |
| Authors:
D. Carlucci; J. Cordes; S. Morris; R. Gast; ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER PICATINNY ARSENAL NJ TECHNICAL RESEARCH CENTER {DUPLICATE#1}
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| Set forward is a highly dynamic condition that occurs when a projectile exits the muzzle of a weapon. The levels of this acceleration, as well as the frequency, are dependent upon the projectile structural characteristics, length, and muzzle exit pressure. The set forward event can not, in general, be modeled using quasi static techniques. A dynamic analysis must be performed, especially for sensitive electronic components. Proper inspection of critical joints ... |
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