National Technical Reports Library: 72 - Mathematicshttp://www.ntis.gov/rss/RSSNTISCategoryList.aspxNational Technical Reports Libraryen(c) 2008, National Technical Information Service. All rights reserved.5RSS Feedhttp://www.ntis.gov/images/logoRSS.jpghttp://www.ntis.govAdaptive Computer-Assisted Mammography Training for Improved Breast Cancer Screening.In this project, we propose to research the methodology for constructing adaptive computer-aided education systems for mammography. Improved mammography education could lead to improved benefit of mammography to breast cancer care and in turn to decr ...http://www.ntis.gov/search/product.aspx?ABBR=ADA601034Adaptive Control of Uncertain Hamiltonian Multi-Input Multi-Output Systems : With Application to Spacecraft Control.A novel adaptive control law for nonlinear Hamiltonian Multi-Input Multi-Output (MIMO) systems with uncertain parameters in the actuator modeling as well as the inertia and/or the Coriolis and centrifugal terms is developed. The physical properties o ...http://www.ntis.gov/search/product.aspx?ABBR=ADA601117Adhesive Characterization and Progressive Damage Analysis of Bonded Composite Joints.The results of an experimental/numerical campaign aimed to develop progressive damage analysis (PDA) tools for predicting the strength of a composite bonded joint under tensile loads are presented. The PDA is based on continuum damage mechanics (CDM) ...http://www.ntis.gov/search/product.aspx?ABBR=N140004578Algebraic Statistics for Network Models.This project focused on the family of exponential random graph models (ERGMs) for networks, characterized by global network summary statistics. These models are especially attractive because they are built precisely around the kinds of network charac ...http://www.ntis.gov/search/product.aspx?ABBR=ADA601381Analysis of High Grazing Angle Sea-clutter with the KK-Distribution.An estimated probability distribution of the backscatter is commonly used to determine the threshold for distinguishing targets from clutter at a given false alarm rate. Data collected at high grazing angles (15 deg - 45 deg) by the Defence Science T ...http://www.ntis.gov/search/product.aspx?ABBR=ADA600517Automated Change Detection for Synthetic Aperture Sonar.In this paper, an automated change detection technique is presented that compares new and historical seafloor images created with sidescan synthetic aperture sonar (SAS) for changes occurring over time. The method consists of a four stage process: a ...http://www.ntis.gov/search/product.aspx?ABBR=ADA601363Bayesian Hierarchical Model Characterization of Model Error in Ocean Data Assimilation and Forecasts.The Bayesian Hierarchical Model (BHM) methodology is exploited to identify, characterize, and model the irreducible model error in ocean data assimilation and forecast systems. ...http://www.ntis.gov/search/product.aspx?ABBR=ADA601463Bayesian Methods and Confidence Intervals for Automatic Target Recognition of SAR Canonical Shapes.This research develops a new Bayesian technique for the detection of scattering primitives in synthetic aperture radar (SAR) phase history data received from a sensor platform. The primary goal of this research is the estimation of size, position, an ...http://www.ntis.gov/search/product.aspx?ABBR=ADA601482Databases for the Global Dynamics of Multiparameter Nonlinear Systems.Developed mathematical theory, efficient algorithms (both with respect to time and memory) and open access code to obtain a rigorous database for the global dynamics of multiparameter nonlinear systems. This included the development of efficient algo ...http://www.ntis.gov/search/product.aspx?ABBR=ADA601063Definition ofthe Design Trajectory and Entry Flight Corridor for the NASA Orion Exploration Mission 1 Entry Trajectory Using an Integrated Approach and Optimization.One of the key design objectives of NASA's Orion Exploration Mission 1 (EM- 1) is to execute a guided entry trajectory demonstrating GN&C capability. The focus of this paper is defining the flyable entry corridor for EM-1 taking into account multiple ...http://www.ntis.gov/search/product.aspx?ABBR=N140004224Design and Implementation of the MARG Human Body Motion Tracking System.Real-time tracking of human body motion has applications in tele- operation, synthetic reality and others. A motion tracking system based on use of the MARG sensor has been under development at Naval Postgraduate School and Miami University. The Magn ...http://www.ntis.gov/search/product.aspx?ABBR=ADA601156Design, Implementation, and Experimental Results of a Quaternion-Based Kalman Filter for Human Body Motion Tracking.Real-time tracking of human body motion is an important technology in synthetic environments, robotics, and other human-computer interaction applications. This paper presents an extended Kalman filter designed for real- time estimation of the orienta ...http://www.ntis.gov/search/product.aspx?ABBR=ADA601172Development of Improved Algorithms and Multiscale Modeling Capability with SUNTANS.The long-term goal is to develop a nonhydrostatic, parallel ocean simulation tool that is capable of simulating processes on a wide range of scales through use of accurate numerical methods and highperformance computational algorithms. The tool will ...http://www.ntis.gov/search/product.aspx?ABBR=ADA601191Direct Strain Tensor Approximation for Full-Field Strain Measurement Methods.Full-field strain measurement techniques are based on computing the spatial derivatives of numerical or functional approximations of the underlying displacement fields extracted from digital imaging methods. These methods implicitly assume that the m ...http://www.ntis.gov/search/product.aspx?ABBR=ADA601398En Route Patient Safety: A Mixed-Methods Study.Because the en route patient care environment is more complex when compared with ground-based facilities, this mixed-methods study provided a unique insight into the culture, concerns, and possible solutions associated with safe patient management du ...http://www.ntis.gov/search/product.aspx?ABBR=ADA600951Experimental Robustness Study of Positive Position Feedback Control for Active Vibration Suppression.POSITIVE position feedback (PPF) control was introduced by Goh and Caughey in 1985 to control vibrations of large exible space structures. A PPF controller has several distinguished advantagesas compared to then widely used velocity feedbackcontrol l ...http://www.ntis.gov/search/product.aspx?ABBR=ADA601090Forecasting Future Sea Ice Conditions in the MIZ: A Lagrangian Approach.We plan to use satellite-derived and climate model simulated sea-ice drift to produce backward trajectories of sea ice from the marginal ice zone and all peripheral seas. For the goals cited above, the back trajectories will be initiated just before ...http://www.ntis.gov/search/product.aspx?ABBR=ADA601203Game theory and Traffic Assignment.The traffic assignment problem (TAP) is one of the steps in the four-step transportation planning process and involves assigning travelers to different routes. This assignment is done based on the the user equilibrium (UE) principle according to whic ...http://www.ntis.gov/search/product.aspx?ABBR=PB2014107487Jealousy Graphs: Structure and Complexity of Decentralized Stable Matching.The stable matching problem has many applications to real world markets and e cient centralized algorithms are known. However, little is known about the decentralized case. Several natural randomized algorithmic models for this setting have been prop ...http://www.ntis.gov/search/product.aspx?ABBR=ADA600700Material Property Characterization of AS4/VRM-34 Textile Laminates.Several material properties (modulus, strengths, and fracture toughness) of a textile composite have been evaluated to provide input data to analytical models of Pultruded Rod Stiffened Efficient Unitized Structure (PRSEUS). The material system is ba ...http://www.ntis.gov/search/product.aspx?ABBR=N140004378Methodology of an Event-Driven Monte Carlo Missile Simulation.This paper describes the methodology used by the Center for Naval Analyses to develop a Monte Carlo missile simulation that computes probabilities of target acquisition and distributions of missile arrival times. The simulation accounts for numerous ...http://www.ntis.gov/search/product.aspx?ABBR=ADA601300Naturalistic Field Studies of Sleep and Performance.The key deliverable in this award's statement of work is to 'Develop a new program at Washington State University - the Spokane Sleep Research Initiative - to focus on the effects of sleep and sleep loss on human performance.' As the Spokane Sleep Re ...http://www.ntis.gov/search/product.aspx?ABBR=ADA600638New Measure of Network Efficiency.We address the issue of the dynamical origin of scale-free link distributions. We study a two-dimensional lattice of cooperatively interacting units. Although the units interact only with the four nearest neighbors, a sufficiently large cooperation s ...http://www.ntis.gov/search/product.aspx?ABBR=ADA600984No Overlap No Gap and the Attack of a Linear Target by n Different Weapons.David and Alalouf have specified the optimal aiming-points for Pattern Firing on a linear target by n identical munitions that are subject to systematic error only. Under the same distributional assumption on the error, namely, that its pdf is unimod ...http://www.ntis.gov/search/product.aspx?ABBR=ADA601157One-Dimensional, Noniterative Trajectory Model (With a C++ Implementation).This report defines algorithms that can be used to calculate speed, distance, and time variables as functions of initial and/or final projectile states. Examples include speed as a function of initial speed and distance traveled, distance traveled as ...http://www.ntis.gov/search/product.aspx?ABBR=ADA600880Parallel Performance of Linear Solvers and Preconditioners.In this report we examine the performance of parallel linear solvers and preconditioners available in the Hypre, PETSc, and MUMPS libraries to identify the combination with the shortest wall clock time for large-scale linear systems. The linear syste ...http://www.ntis.gov/search/product.aspx?ABBR=ADA601228Physically Consistent Eddy-resolving State Estimation and Prediction of the Coupled Pan-Arctic Climate System at Daily to Interannual Time Scales Using the Regional Arctic Climate Model (RACM).The overall science goal of this project is to address the short to long-term US Navy / DOD (Arctic Roadmap, 2009) and national requirements (Roberts et al., 2010) to understand and predict arctic climate change. The proposed research leverages ongoi ...http://www.ntis.gov/search/product.aspx?ABBR=ADA601279Quantifying Breaking-Wave Dissipation Using Nonlinear Phase-Resolved Wavefield Simulations.To understand and quantify wave-breaking dissipation using direct phase-resolved simulation of nonlinear wavefield evolution; and to develop effective modeling/parameterization of wave-breaking dissipation and wind forcing for phase-averaged wave pre ...http://www.ntis.gov/search/product.aspx?ABBR=ADA601390Quantitative Modeling of Virus Evolutionary Dynamics and Adaptation in Serial Passages Using Empirically Inferred Fitness Landscapes.We describe a stochastic virus evolution model representing genomic diversification and within-host selection during experimental serial passages under cell culture or live-host conditions. The model incorporates realistic descriptions of the virus g ...http://www.ntis.gov/search/product.aspx?ABBR=ADA601242Reconstruction Error and Principal Component Based Anomaly Detection in Hyperspectral Imagery.The rapid expansion of remote sensing and information collection capabilities demands methods to highlight interesting or anomalous patterns within an overabundance of data. This research addresses this issue for hyperspectral imagery (HSI). Two new ...http://www.ntis.gov/search/product.aspx?ABBR=ADA601028Report: Low Frequency Predictive Skill Despite Structural Instability and Model Error.The PI, Andrew Majda, and the postdoctoral associates, Themis Sapsis and Michal Branicki (funded by the DRI) have submitted the following papers all with the PI as author (and other collaborators listed). Sapsis and Branicki have recently accepted te ...http://www.ntis.gov/search/product.aspx?ABBR=ADA601429Scanned Probe Microscopy of Electronic Transport in Carbon Nanotubes.We use electrostatic force microscopy and scanned gate microscopy to probe the conducting properties of carbon nanotubes at room temperature. Multiwalled carbon nanotubes are shown to be diffusive conductors, while metallic single-walled carbon nanot ...http://www.ntis.gov/search/product.aspx?ABBR=ADA601003Simplified Quaternion-Based Algorithm for Orientation Estimation From Earth Gravity and Magnetic Field Measurements.Orientation of a static or slow-moving rigid body can be determined from the measured gravity and local magnetic field vectors. Some formulation of the QUaternion ESTimator (QUEST) algorithm is commonly used to solve this problem. Triads of accelerom ...http://www.ntis.gov/search/product.aspx?ABBR=ADA601113State-Space Analysis of Model Error: A Probabilistic Parameter Estimation Framework with Spatial Analysis of Variance.An over-arching goal in prediction science is to objectively improve numerical models of nature. Meeting that goal requires objective quantification of deficiencies in our models. The structural differences between a numerical model and a true system ...http://www.ntis.gov/search/product.aspx?ABBR=ADA601277Use of Least Means Squares Filter in Control of Optical Beam Jitter.Meeting optical beam jitter requirements is becoming a challenging problem for several space programs. A laser beam jitter control test bed has been developed at the Naval Postgraduate School to develop improved jitter control techniques. Several con ...http://www.ntis.gov/search/product.aspx?ABBR=ADA601094Very Large Eddy Simulations of a Jet-A Spray Reacting Flow in a Single Element LDI Injector With and Without Invoking an Eulerian Scalar DWFDF Method.This paper presents the very large eddy simulations (VLES) of a Jet-A spray reacting flow in a single element lean direct injection (LDI) injector by using the National Combustion Code (NCC) with and without invoking the Eulerian scalar DWFDF method, ...http://www.ntis.gov/search/product.aspx?ABBR=N140002508