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.govAdhesive 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=N140004578Aircraft Route Optimization using the A-Star Algorithm.This research develops an Aviation Distance Estimation and Route Planning Tool (ADERPT) that finds least-cost aircraft routing from a designated departure airfield to an arrival airfield for the purposes of mission cost estimation and pre-mission pla ...http://www.ntis.gov/search/product.aspx?ABBR=ADA600125Analysis of Heat Partitioning During Sliding Contact at High Speed and Pressure.This research develops a mathematical formulation and an analytical solution to frictional heat partitioning in a high speed sliding system. Frictional heating at the interface of sliding materials impacts temperature and the wear mechanisms. The hea ...http://www.ntis.gov/search/product.aspx?ABBR=ADA600344Analysis of Stability Properties in Earned Value Managements Cost Performance Index and Earned Schedules Schedule Performance Index.The concept of a Cost Performance Index (CPI) 'stability rule' originated with the seminal article from Christensen and Payne in 1992 and has become routinely cited by subsequent academic literature and EVM authors. A literature review reveals that t ...http://www.ntis.gov/search/product.aspx?ABBR=ADA600346Army Independent Risk Assessment Guidebook.This report presents the US Army's approach to Risk Assessments for Army Acquisition programs, with a focus on Technical and Schedule Risk. This report addresses in detail the complete breadth of Technical and Schedule Risk Assessment methodologies e ...http://www.ntis.gov/search/product.aspx?ABBR=ADA599874Assessment of the Accuracy of Certain Reduced Order Models used in the Prediction of Occupant Injury during Under-Body Blast Events.It is of considerable interest to developers of military vehicles, in early phases of the concept design process as well as in Analysis of Alternatives (AoA) phase, to quickly predict occupant injury risk due to under- body blast loading. The most co ...http://www.ntis.gov/search/product.aspx?ABBR=ADA599846Average Path Length in Decision Diagrams of Multiple-Valued Functions.We consider the path length in decision diagrams for multiple-valued functions. This is an important measure of a decision diagram, since this models the time needed to evaluate the function. We focus on the average path length (APL), which is the su ...http://www.ntis.gov/search/product.aspx?ABBR=ADA599953Average Path Length of Binary Decision Diagrams.The traditional problem in binary decision diagrams (BDDs) has been to minimize the number of nodes since this reduces the memory needed to store the BDD. Recently, a new problem has emerged: minimizing the average path length (APL). APL is a measure ...http://www.ntis.gov/search/product.aspx?ABBR=ADA599949Biomarkers to Assess Possible Biological Effects on Reproductive Potential, Immune Function, and Energetic Fitness of Bottlenose Dolphins Exposed to Sounds Consistent with Naval Sonars.The overarching goal of this research is to utilize novel biomarkers to examine whether significant sub-lethal responses to sonar-type sounds occur in bottlenose dolphins exposed to such sounds. The collaborators will use immune function markers, acu ...http://www.ntis.gov/search/product.aspx?ABBR=ADA599825Bottlenose Dolphin (Tursiops truncatus) as a Model to Understand Variation in Stress and Reproductive Hormone Measures in Relation to Sampling Matrix, Demographics, and Environmental Factors.Our overarching goal is to develop indicators and methods to quantify chronic stress in bottlenose dolphins. Much research has focused on the stimuli which induce stress in marine mammals, as well as the hormonal mediators of the stress response. Str ...http://www.ntis.gov/search/product.aspx?ABBR=ADA599708Bottlenose Dolphin (Tursiops truncatus) as a Model to Understand Variation in Stress and Reproductive Hormone Measures in Relation to Sampling Matrix, Demographics, and Environmental Factors.Our overarching goal is to develop indicators and methods to quantify chronic stress in bottlenose dolphins. Much research has focused on the stimuli which induce stress in marine mammals, as well as the hormonal mediators of the stress response. Str ...http://www.ntis.gov/search/product.aspx?ABBR=ADA599709Bottlenose Dolphin (Tursiops truncatus) as a Model to Understand Variation in Stress and Reproductive Hormone Measures in Relation to Sampling Matrix, Demographics, and Environmental Factors.The overarching goal of this research is to develop indicators and methods to quantify chronic stress in bottlenose dolphins. Much research has focused on the stimuli that induce stress in marine mammals, as well as the hormonal mediators of the stre ...http://www.ntis.gov/search/product.aspx?ABBR=ADA599823Bottlenose Dolphin (Tursiops truncatus) as a Model to Understand Variation in Stress and Reproductive Hormone Measures in Relation to Sampling Matrix, Demographics, and Environmental Factors.The overarching goal of this research is to develop indicators and methods to quantify chronic stress in bottlenose dolphins. Much research has focused on the stimuli that induce stress in marine mammals, as well as the hormonal mediators of the stre ...http://www.ntis.gov/search/product.aspx?ABBR=ADA599824Classification Study using a Handheld, Three-Element EMI Sensor.Typical library matching procedures used for classification ask how much a given target's principal axis polarizabilities resemble those of targets of interest (TOIs). The polarizabilities are calculated from sensor array data using dipole inversion. ...http://www.ntis.gov/search/product.aspx?ABBR=ADA600400Comparison of the Worst and Best Sum-Of-Products Expressions for Multiple-Valued Functions.Because most practical logic design algorithms produce irredundant sum-of-products (ISOP) expressions, the understanding of ISOPs is crucial. We show a class of functions for which Morreale-Minato's ISOP generation algorithm produces worst ISOPs (WSO ...http://www.ntis.gov/search/product.aspx?ABBR=ADA599955Decision Support Tools for Munitions Response Performance Prediction and Risk Assessment.While significant advances have been made in the acquisition and processing of geophysical data for classification of buried munitions, the success if any classification strategy strongly depends upon site characteristics, including range of munition ...http://www.ntis.gov/search/product.aspx?ABBR=ADA600401Definition 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=N140004224Delta-Complete Reachability Analysis (Part 1).We give a new framework for safety verification of nonlinear hybrid systems, based on delta-decidability of first-order logic formulas over the real numbers. We use expressive logic formulas (which can contain nonlinear ODEs with no analytic solution ...http://www.ntis.gov/search/product.aspx?ABBR=ADA600179Development of Ultrasound to Measure In-Vivo Dynamic Cervical Spine Intervertebral Disc Mechanics.We developed a unique dual ultrasound system that can non-invasively measure IVD deformation and mechanical compliance ex-vivo, and provide real- time images of IVDs and dynamic vertebral motion in-vivo during simulated tasks relevant to acute and ch ...http://www.ntis.gov/search/product.aspx?ABBR=ADA600493Diffuse Interface Methods for Multiclass Segmentation of High- Dimensional Data.We present two graph-based algorithms for multiclass segmentation of high-dimensional data, motivated by the binary diffuse interface model. One algorithm generalizes Ginzburg. Landau /201GL/202 functional minimization on graphs to the Gibbs simplex. ...http://www.ntis.gov/search/product.aspx?ABBR=ADA600498Efficiency of Microwave Heating of Weakly Loaded Polymeric Nanocomposites (Postprint).Electrical and thermal conductivity of materials are typically correlated, while some applications, including thermoelectrics, require these parameters to be controlled independently. Such independent control of thermal and electromagnetic properties ...http://www.ntis.gov/search/product.aspx?ABBR=ADA599848Fast Nonsymmetric Iterations and Preconditioning for Navier-Stokes Equations.Discretization and linearization of the steady-state Navier-Stokes equations gives rise to a nonsymmetric indefinite linear system of equations. In this paper, we introduce preconditioning techniques for such systems with the property that the eigenv ...http://www.ntis.gov/search/product.aspx?ABBR=ADA599710Geospatial Analysis of Construction Labor Wage Rates in the United States of America.The United States government spends millions of dollars on construction every year. Each construction project paid for by the government is subject to the requirements of the Davis-Bacon Act (DBA). The DBA is a federal law that sets minimum wages, ca ...http://www.ntis.gov/search/product.aspx?ABBR=ADA600327Identification and Management of Multiple Threats to Rare and Endangered Plant Species.We investigated effects of deer, nutrient addition, and presence of non-native plants, earthworms and a root-weevil on demography of rare understory species (Aristolochia serpentaria, Agrimonia rostellata, Carex retroflexa, and Trillium erectum) usin ...http://www.ntis.gov/search/product.aspx?ABBR=ADA600407Material 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=N140004378Minimization of Average Path Length in BDDs by Variable Reordering.Minimizing the Average Path Length (APL) in a BDD reduces the time needed to evaluate Boolean functions represented by BDDs. This paper describes an efficient heuristic APL minimization procedure based on BDD variable reordering. The reordering algor ...http://www.ntis.gov/search/product.aspx?ABBR=ADA599936Model-Based Fault Diagnosis in Electric Drives Using Machine Learning.Electric motor and power electronics based inverter are the major components in industrial and automotive electric drives. In this paper we present a model based fault diagnostics system developed using machine learning technology for detecting and l ...http://www.ntis.gov/search/product.aspx?ABBR=ADA600548More Anonymous Onion Routing Through Trust.We consider using trust information to improve the anonymity provided by onion-routing networks. In particular, we introduce a model of trust in network nodes and use it to design path-selection strategies that minimize the probability that the adver ...http://www.ntis.gov/search/product.aspx?ABBR=ADA599993Optimal Design for Parameter Estimation in EEG Problems in a 3D Multilayered Domain.The fundamental problem of collecting data in the 'best way' in order to assure statistically efficient estimation of parameters is known as Optimal Experimental Design. Many inverse problems consist in selecting best parameter values of a given math ...http://www.ntis.gov/search/product.aspx?ABBR=ADA599689Planning Under Uncertainty: Moving Forward.Reasoning about uncertainty is an essential component of many real- world planning problems, such as robotic and space applications, military operations planning, air and ground traffic control, and manufacturing systems. Planning under uncertainty f ...http://www.ntis.gov/search/product.aspx?ABBR=ADA599960Programmable Numerical Function Generators Based on Quadratic Approximation: Architecture and Synthesis Method.This paper presents an architecture and a synthesis method for programmable numerical function generators (NFGs) for trigonometric, logarithmic, square root, and reciprocal functions. Our NFG partitions a given domain of the function into non-uniform ...http://www.ntis.gov/search/product.aspx?ABBR=ADA599939Proof of Two Conjectures Related to the Erdos-Debrunner Inequality.In this paper we prove two conjectures proposed by Janous on an extension to the p-th power-mean of the Erdoes-Debrunner inequality relating the areas of the four sub-triangles formed by connecting three arbitrary points on the sides of a given trian ...http://www.ntis.gov/search/product.aspx?ABBR=ADA600558Redundant Multiple-Valued Number Systems.We survey number systems in which the digits are multiple-valued and the representations are redundant. In a redundant number system, there is at least one value that can be written in at least two ways. As a basis of comparison, we consider also non ...http://www.ntis.gov/search/product.aspx?ABBR=ADA599946Road Network Conflation Based on Radar Tracks.Using ground target radar tracks as building blocks, sophisticated road map estimation and fusion algorithms are developed. A maximum likelihood road estimator, as well as its corresponding Cramer-Rao lower bound, is derived. A track to road associat ...http://www.ntis.gov/search/product.aspx?ABBR=ADA600348Sensitivity Analysis within the 4DVAR Framework.The sensitivity of model forecasts to uncertainties in control variables is evaluated using the adjoint technique and the ensemble generated by the reduced-order four-dimensional variational data assimilation (R4DVAR) algorithm within the framework o ...http://www.ntis.gov/search/product.aspx?ABBR=ADA599776Statistical Analysis of Atmospheric Forecast Model Accuracy - A Focus on Multiple Atmospheric Variables and Location-Based Analysis.Atmospheric effects on commercial and military air platforms are of concern and must be considered for flight planning or military mission execution. Atmospheric models exist that can forecast adverse weather, thus mitigating the impacts on operation ...http://www.ntis.gov/search/product.aspx?ABBR=ADA600391Statistical Methodologies for Exposure Assessments.The proposed research was on the development of statistical procedures appropriate for analyzing exposure data, based on statistical models directly relevant for exposure assessment. The following topics were investigated: the univariate and bivariat ...http://www.ntis.gov/search/product.aspx?ABBR=PB2014106352Stochastic Modeling and Uncertainty Cascade of Soil Bearing and Shearing Characteristics for Light-Weight Vehicle Applications.This paper investigates the validity of commonly used terramechanics models for light-weight vehicle applications while accounting for experimental variability. This is accomplished by means of cascading uncertainty up to the terminal point of operat ...http://www.ntis.gov/search/product.aspx?ABBR=ADA599693Strategic and Operational Importance of Peleliu During the Pacific War.The purpose of this paper is to explore and examine the. battle of Peleliu, Operation Stalemate II during the Pacific War. The primary concern is to answer the question; how important was the seizure of Peleliu and what were the operational impacts a ...http://www.ntis.gov/search/product.aspx?ABBR=ADA600046Understanding Modern Maritime Piracy: A Complex Adaptive System Approach.Maritime piracy has long-standing history throughout the world and, while tactics hove changed, the basic criminal act and motives behind it have remained the same over time. Modem maritime pirate organizations ore composed primarily of members of cl ...http://www.ntis.gov/search/product.aspx?ABBR=ADA600192UPenn Multi-Robot Unmanned Vehicle System (MAGIC).In this report, we describe the technical approach and algorithms that have been used by the University of Pennsylvania for multi-robot perception, planning, and control in the context of the MAGIC competition and in ensuing years. We have constructe ...http://www.ntis.gov/search/product.aspx?ABBR=ADA599881User Authentication from Web Browsing Behavior.As anticipated in True Names by Vernor Vinge, identity has been recognized as our most valued possession in cyberspace. Attribution is a key concept in enabling trusted identities and deterring malicious activities. As more people use the Web to comm ...http://www.ntis.gov/search/product.aspx?ABBR=ADA599778Using Software Generation and Repair for Cyber-Defense.This work investigates the use of medium-grained synthetic diversity to inhibit an attacker s ability to identify and exploit weaknesses in a networked application. We specify the application and use formal refinements to generate numerous implementa ...http://www.ntis.gov/search/product.aspx?ABBR=ADA599889Very 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=N140002508Waves and the Equilibrium Range at Ocean Weather Station P.Wave and wind measurements at Ocean Weather Station P (OWS-P, 50 deg N 145 deg W) are used to evaluate the equilibrium range of surface wave energy spectra. Observations are consistent with a local balance between wind input and breaking dissipation, ...http://www.ntis.gov/search/product.aspx?ABBR=ADA599777Worst Case Number of Terms In Symmetric Multiple-Valued Functions.A symmetric multiple-valued function can be realized as the disjunction of fundamental symmetric functions. A simpler disjunction can be formed when the latter functions combine in the same way that minterms combine to form simpler product terms for ...http://www.ntis.gov/search/product.aspx?ABBR=ADA599945