THE WAVELET TRANSFORM IS APPLIED TO THE ANALYSIS OF ULTRASONIC WAVES FOR IMPROVED SIGNAL DETECTION AND ANALYSIS OF THE SIGNALS. In instances where the mother wavelet is well defined, the wavelet transform has relative insensitivity to noise and does not need windowing. Peak detection of ultrasonic pulses using the wavelet transform is described and results show good detection even when large white noise was added. The use of the wavelet transform to extract the frequency dispersion relation of...

Topics: DTIC Archive, Abbate, A., ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER WATERVLIET NY...

A full envelope controller synthesis technique is developed for multiple-input single-output (MISO) nonlinear systems with structured parameter uncertainty. The technique maximizes the controller's valid region of operation, while guaranteeing pre-specified transient performance. The resulting controller does not require on-line adaptation, estimation, prediction or model identification. Fuzzy Logic (FL) is used to smoothly schedule independently designed point controllers over the operational...

Topics: DTIC Archive, Kobylarz, Thomas J., AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH, *NONLINEAR...

Two common concerns in the use of sandwich composite construction are the effects of low velocity impact and delamination upon structural failure. Finite element analysis of these events can provide a comprehensive time history of the resulting stress strain, displacement, and velocity at all points in a structure. The purpose of this research is to develop a finite element model of a sandwich composite and use this model to analyze the dynamic response of an unbalanced sandwich beam, a...

Topics: DTIC Archive, Wojcik, Gerald W., NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *IMPACT STRENGTH,...

The two- and three-dimensional development of leading-edge receptivity and transition in a 2-D Joukowsky airfoil boundary layer are investigated by direct numerical simulation (DNS) using the incompressible Navier-Stokes equations. The numerical investigation are based on the so-called spatial approach. A contravariant based governing system is derived so that we can simulate the receptivity and transition with complex geometries. The numerical results agreed very well with the experimental...

Topics: DTIC Archive, Liu, Chaoqun, COLORADO UNIV AT DENVER, *AIRFOILS, *BOUNDARY LAYER TRANSITION,...

A discontinuous Galerkin formulation that avoids the use of discrete quadrature formulas is described and applied to linear and nonlinear test problems in one and two space dimensions. This approach requires less computational time and storage than conventional implementations but preserves the compactness and robustness inherent in the discontinuous Galerkin method. Test problems include the linear and nonlinear one-dimensional scalar advection of smooth initial value problems that are...

Topics: DTIC Archive, Atkins, H. L., INSTITUTE FOR COMPUTER APPLICATIONS IN SCIENCE AND ENGINEERING HAMPTON...

The overall aim of our research proposal is the statistical inference of nonparametric estimates, the restribution-to-the-inside estimator (RTIE) and the generalized maximum likelihood estimator (GMLE),for the survival function of a time-to-event variable that is subject to interval censoring. The RTIE, which is proposed by us, has a closed-form expression and is equal to the GMLE under a homogeneous condition. The GMLE is the standard optimal procedure in survival analysis. However, no...

Topics: DTIC Archive, Wong, George Y., STRANG CANCER PREVENTION CENTER NEW YORK, *CLINICAL MEDICINE, *CASE...

The interaction picture is used together with the channel-packet method in a new time-dependent approach to compute reactive scattering matrix elements. The channel-packet method enables the use of the interaction picture for computing reactive S-matrix elements by splitting the computational effort into two parts. First, asymptotic reactant and product wavepackets are individually propagated into the interaction region of the po tential to form Moeller states. The interaction picture, in...

Topics: DTIC Archive, MacLachlan, Michael J., AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH, *SCATTERING,...

In their previous article D. H. Huang, A. Singh, and D. A. Cardimona, Journal of Applied Physics, v87, 2427 (2000), the authors explained the experimentally observed zero-bias residual tunneling current A. Singh and D. A. Cardimona, Opt. Eng., v38, 1424 (1999) in quantum-well photodetectors biased by an ac voltage. In this article, they extend their theory to include the photoemission current and to reproduce their recent finding on the dynamical drop of photoresponsivity from its static value...

Topics: DTIC Archive, Huang, Danhong, AIR FORCE RESEARCH LAB KIRTLAND AFB NMSPACE VEHICLES DIRECTORATE,...

A completed research program is presented which has developed new computational methods to study geomechanics ground motions excited by subsurface sources. Both in-plane (plane strain) and out-of-plane (anti-plane strain) motions are investigated by employing a direct boundary element method within the framework of linear dynamic elasticity theory. The constructed boundary element method uses a time-dependent, half-space Green's function; thereby, eliminating the need to discretize the free...

Topics: DTIC Archive, Sadd,M H, RHODE ISLAND UNIV KINGSTON DEPT OF MECHANICAL ENGINEERING AND APPLIED...

A combat model governed by a system of partial differential equations involving both spatial and time dependence is analyzed from the perspective of a military operational planner. Recent Soviet military literature alludes to such a model, which appears to differ significantly from present United States combat modeling philosophy and capability. The military consequences of the assumptions implicit in the use of these equations are investigated. While the description of the model is presently...

Topics: DTIC Archive, Lutz,D A, ARMY WAR COLL CARLISLE BARRACKS PA, *WAR GAMES, SPATIAL DISTRIBUTION, TIME...

One of the aims of this investigation was to develop a limited area planetary boundary layer desert model for computers of limited power. We derived a general system of vertically integrated equations, including a dust concentration equation and an inversion height equation. The boundary layer was divided into a constant flux layer, a transition layer, and an inversion layer. The model equations predict the mean (vertically averaged) winds in the transition layer, the potential temperature at...

Topics: DTIC Archive, Berkofsky,L, BEN-GURION UNIV OF THE NEGEV SEDE BOQER (ISRAEL) JACOB BLAUSTEIN INST...

The Time Dependent Dielectric Breakdown (TDDB) has been studied for silicon dioxide by using a staircase voltage ramping technique. The result of the ramp tests on MOS capacitors indicates a definitive substrate effect on the TDDB, which manifests itself as an enhancement of the intermediate field breakdown in the breakdown histogram. The substrate effect observed may be caused by the oxygen impurities of the starting material. This conclusion is based on the observed fact that the gate oxide...

Topics: DTIC Archive, Kim,J S, WESTINGHOUSE DEFENSE AND ELECTRONICS CENTER BALTIMORE MD ADVANCED TECHNOLOGY...

Our work during this period continued to have as its main objective the study of (a) the thermodynamics and structure of plasmas and dense molecular fluids and (b) the distribution of the microfield in a strongly coupled plasma. Our research included both rigorous analysis and approximation schemes. We continued applying our medium approximation to a variety of systems. This method continues to be the simplest scheme available for dealing with dense diatomic fluids. It also seems to work...

Topics: DTIC Archive, Lebowitz,J L, RUTGERS - THE STATE UNIV NEW BRUNSWICK N J DEPT OF MATHEMATICS,...

Automated cell detection in radar observations of convective storm complexes has been explored as a severe storm indicator. Six-dB peaks were detected in the radar reflectivity fields and their characteristics were monitored as a function of time. It was found in a severe tornadic storm that the number of cells and the average intensity of the cells had trends that appear to be characteristic of super-cell storms with these trends being identifiable at least 45 min before the touchdown of the...

Topics: DTIC Archive, Harris,F I, SYSTEMS AND APPLIED SCIENCES CORP VIENNA VA, *RADAR REFLECTIONS,...

The analysis of performance time is used to study a wide variety of manpower, training, and human factors problems in the Navy. The cumulative distribution of performance time provides some indication of the rate of performance, but it can lead to false conclusions as well. One method of measuring the rate of performance with a shifting residual basis of analysis, called hazard analysis, consists of estimating a hazard function, which shows the rate of performance as a function of time....

Topics: DTIC Archive, Bloxom, Bruce, NAVY PERSONNEL RESEARCH AND DEVELOPMENT CENTER SAN DIEGO CA,...

This report is a sequel to the report 'Basic Formulae for Determining the Computation of the Deflection of the Vertical from Astronomic Star Observations' (AD-A154 912). It addresses a new observational method that allows one to compute the astronomic zenith distance of the astrolabe instrument as a function of the time when the stars cross the almucantar of the astrolabe and their right ascension and declination, therefore independent of the astronomic station coordinates. The xi and eta...

Topics: DTIC Archive, Baldini, Angel A, ARMY ENGINEER TOPOGRAPHIC LABS FORT BELVOIR VA, *ASTRONOMICAL...

In the shallow water acoustics problem, a time-harmonic source is placed in the ocean and a hydrophone records the acoustic pressure field as a function of range from the source. In this thesis, new techniques related to the synthetic generation, acquisition, and inversion of this data are developed. A hybrid method for accurate shallow water synthetic data generation is presented. The method is based on computing the continuum portion analytically. In the related problem of extracting the...

Topics: DTIC Archive, Wengrovitz,Michael S, MASSACHUSETTS INST OF TECH CAMBRIDGE RESEARCH LAB OF...

The conductivity of seven epoxy resins of varying molecular weights were studied (without hardener) as a function of temperature. In addition, a low molecular weight resin was cured isothermally with an aromatic amine hardener and the conductivity was measured as a function of cure time. The conductivities of the resins without hardener obey a Williams-Landel-Ferry relation, and by incorporating a cure-dependent glass transition temperature into this relation, the observed behavior of the...

Topics: DTIC Archive, Sheppard,Norman F , Jr, MASSACHUSETTS INST OF TECH CAMBRIDGE MICROSYSTEMS TECHNOLOGY...

The dynamics of spins in semiconductor quantum dots often is controlled by their hyperfine coupling to nuclear spins. We develop a straightforward and efficient approach to describe the dynamics and the effective decoherence of the electron spins due to hyperfine coupling in realistic quantum dots. Systems with a large number of nuclei and an arbitrary initial nuclear polarization for which the number of nuclei initially flipped over is much less than the total number of nuclei are treated....

Topics: DTIC Archive, NAVAL RESEARCH LAB WASHINGTON DC, *ELECTRONS, *NUCLEAR SPINS, *QUANTUM DOTS,...

This report describes a new method for studying the emergence of technologies through the analysis of the relationships between patent applications and issued patents and their assigned classifications and subclassifications, which represents the network of connections between different technology areas. These classifications have been defined by the United States Patent and Trademark Office (USPTO) and patent organizations in other countries and regions.

Topics: DTIC Archive, RAND NATIONAL DEFENSE RESEARCH INST SANTA MONICA CA, *PATENT APPLICATIONS, *PATENTS,...

In this paper, spatially high-order Residual-Distribution (RD) schemes using the first-order hyperbolic system method are proposed for general time-dependent advection-diffusion problems. The corresponding second-order time-dependent hyperbolic advection-diffusion scheme was first introduced in [NASA/TM-2014-218175, 2014], where rapid convergences over each physical time step, with typically less than five Newton iterations, were shown. In that method, the time-dependent hyperbolic...

Topics: DTIC Archive, NATIONAL INST OF AEROSPACE ASSOCIATES HAMPTON VA, *ADVECTION, *DIFFUSION, *TIME...

Construction and validation of coupled physical/ecological/bio-optical models of phytoplankton and colored dissolved organic matter [CDOM] on continental shelves to predict both the timedependent spatially-heterogeneous inherent optical properties [IOP] of subsurface waters and the consequent hyperspectral water leaving radiances [Lw] at the surface.

Topics: DTIC Archive, UNIVERSITY OF SOUTH FLORIDA SAINT PETERSBURG COLL OF MARINE SCIENCE, *OPTICAL...

The ultimate goal of this project is to improve the predictive understanding of the time-dependent, frequency-dependent, radiative properties of multicomponent aerosols containing mineral dust in the marine environment.

Topics: DTIC Archive, COLORADO UNIV AT BOULDER DEPT OF ATMOSPHERIC AND OCEANIC SCIENCES, *AEROSOLS,...

This document considers the numerical solution of the Schroedinger's equation and investigate several different algorithms for implementing the Alternating Direction Method on hypercubes. The author indicate the relative merits of the algorithms depending on cube parameters such as arithmetic speed, communication latency, transfer rate, the packet size, and the cost of reordering data locally. Presented are timings for the Intel iPSC that show that Alternating Direction Methods can be...

Topics: DTIC Archive, Saied,Faisal, YALE UNIV NEW HAVEN CT DEPT OF COMPUTER SCIENCE, *QUANTUM THEORY,...

Analytical and experimental investigations have been performed to determine crack growth behavior of turbine engine disk and blade alloys under various loading conditions typical of service environments. Tests were performed at elevated temperature in vacuum also to evaluate the baseline crack growth behavior. Substructural analysis of creep rupture specimens were conducted to understand the basic mechanism of time-dependent elevated temperature deformation. The work performed can be divided...

Topics: DTIC Archive, Ashbaugh, Noel E, DAYTON UNIV OH RESEARCH INST, *ALLOYS, *GAS TURBINES, *TURBINE...

The overall goal of the research is to obtain a better understanding of the basic chemical and physical processes operating in the geoplasma environment, including the ionosphere, thermosphere, and magnetosphere. Some of the specific tasks include the following: (1) Studies of ionospheric structure and irregularities; (2) Study the feasibility of developing better operational ionospheric models for the Air Force; (3) Conduct model/data comparisons in order to validate the ionospheric models;...

Topics: DTIC Archive, Schunk, Robert W, UTAH STATE UNIV LOGAN CENTER FOR ATMOSPHERIC AND SPACE SCIENCES,...

In this study we address the problem of how to convert sortie and operating hour failure data into factors compatible with the AFLC requirements system in order to improve the computation of Electronic Counter Measures (ECM) War Reserve Materiel (WRM) requirements. The current system estimates wartime spares requirements using flying hour demand rates and programs. Peacetime flying hour demand rates are transformed into wartime rates using estimated ratios of wartime-to-peacetime ECM usage per...

Topics: DTIC Archive, Sakulich, Timothy J, AIR FORCE LOGISTICS COMMAND WRIGHT-PATTERSON AFB OH, *AVIONICS,...

The use of implicit time-dependent schemes for the numerical solution of low speed, low Reynolds number flows with heat addition is investigated. Stability analyses show that the errors introduced by approximate factorization give rise to instability at Reynolds numbers around 100. Specifically, it is the cross-derivative errors between the viscous and inviscid terms that cause problems. When exact inversion techniques are used, the system becomes strongly stable and numerical experiments show...

Topics: DTIC Archive, Hosangadi, Ashvin, PENNSYLVANIA STATE UNIV UNIVERSITY PARK DEPT OF MECHANICAL...

A time dependent, axisymmetric code is employed to examine the development of sidebands in a free electron laser. For the case where the input signal undergoes an extended period of exponential growth, a broad spectrum of sidebands with growth rates comparable to that of the signal is excited. In general, in an untapered system the optical field displays considerable modulation after several synchrotron periods. An analytical mode, in qualitative agreement with a number of features of the...

Topics: DTIC Archive, Hafizi, B, NAVAL RESEARCH LAB WASHINGTON DC, *SYNCHROTRONS, *FREE ELECTRON LASERS,...

The Northeast Artificial Intelligence Consortium's (NAIC) purpose is to conduct pertinent research in artificial intelligence and to perform activities ancillary to this research. This report describes progress that has been made in the second year of existence. The topics covered in general are: versatile expert system for equipment maintenance, distributed AI for communications system control, automatic photo interpretation, time-oriented problem solving, speech understanding systems,...

Topics: DTIC Archive, Weiss, Volker, SYRACUSE UNIV NY, *ARTIFICIAL INTELLIGENCE, *AUTOMATION, *SPEECH...

The Northeast Artificial Intelligence Consortium (NAIC) was created to conduct pertinent research in artificial intelligence and to perform activities ancillary to this research. This report describes: versatile expert system for equipment maintenance, distributed AI for communications system control, automatic photo interpretation, time-oriented problem solving, speech understanding systems, knowledge base maintenance, hardware architectures for very large systems, knowledge-based reasoning...

Topics: DTIC Archive, Berra, P B, SYRACUSE UNIV NY, *COMPUTER ARCHITECTURE, *ARTIFICIAL INTELLIGENCE, *REAL...

The Northeast Artificial Intelligence Consortium (NAIC) purpose is to conduct pertinent research in artificial intelligence and to perform activities ancillary to this research. This report describes progress that has been made in the third year of the existence of the NAIC on the technical research tasks undertaken at the member universities. The topics covered in general are: versatile expert system for equipment maintenance, distributed AI for communications system control, automatic...

Topics: DTIC Archive, Modestino, James, SYRACUSE UNIV NY, *SPEECH ANALYSIS, *ARTIFICIAL INTELLIGENCE,...

Nowadays, it is common to see the use of a network of machines to distribute the workload and to share information between machines. In these distributed systems, the scheduling of resources to applications may be accomplished by a Resource Management System (RMS). In order to come up with a good schedule for a set of applications to be distributed among a set of machines, the scheduler within an RMS uses a model to predict the execution time of the applications. A model from a previous thesis...

Topics: DTIC Archive, Shaeffer, Blanca A, NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *DISTRIBUTED DATA...

The overall aim of the research proposal is the statistical nonparametric inferences of the redistribution-to- the-center estimator (RTCE) and the generalized maximum likelihood estimator (GMLE) for the survival function of a time-to-event variable that is subject to interval censoring. The RTCE, proposed by the Strang Center, has a closed-form expression and is equal to GMLE under a homogeneous condition. The GMLE is the standard estimator in survival analysis. However, it cannot be expressed...

Topics: DTIC Archive, Wong, George, STRANG CANCER PREVENTION CENTER NEW YORK, *NONPARAMETRIC STATISTICS,...

The temperature increase in the main body portion of a kinetic energy penetrator flying at sea level with a speed of 1,500 m/s was calculated using an analytical conduction analysis with a convective boundary condition. The penetrator was modeled as a smooth cylinder of uniform diameter and material properties. The results from a previously published computational fluid dynamics simulation were used to provide the convective heat transfer coefficient and the temperature of the gas flowing over...

Topics: DTIC Archive, Bjerke, Todd W, ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD, *PENETRATION, *KINETIC...

A system is subject to shocks which cause the system to deteriorate. In previous studies, distribution properties of such systems are discussed for different types of deterioration processes. At best these processes are right continuous Markov processes. Our interest in this paper is to tackle a related but different problem: we assume that the normal cost of running the system is 'a' per unit of time and that each shock to the system increases the running cost by 'c' per unit of time. The cost...

Topics: DTIC Archive, Abdel-Hameed,M, NORTH CAROLINA UNIV AT CHARLOTTE DEPT OF MATHEMATICS, *SHOCK WAVES,...

Observations of the F2-region critical frequency, foF2, and values determined from the time-dependent continuity equation for ions and electrons in the ionosphere have been used to develop a new set of numerical coefficients to represent the global variation of foF2. The coefficients developed in this study, like those in earlier investigations, permit monthly median hourly values of foF2 to be obtained at any location around the globe for any month of the year and solar activity level. The...

Topics: DTIC Archive, Anderson, D. N., NATIONAL TELECOMMUNICATIONS AND INFORMATION ADMINISTRATION BOULDER...

This investigation examines the capability to predict the growth of cracks in critical structural components operating at elevated temperatures where time-dependent behavior occurs. A viscoplastic constitutive model for INCO 718 was developed to determine this behavior in the area of the crack tip. The model constants were obtained from monotonically increasing, cyclic, and sustained loading. Therefore, the model has the capability to account for load history effects as well as material damage...

Topics: DTIC Archive, Wilson,D A, PRATT AND WHITNEY WEST PALM BEACH FL GOVERNMENT PRODUCTS DIV, *ENGINE...

Experimental data for the phase-boundary reaction and subsequent diffusion occurring when glass surfaces are exposed to aqueous cesium (Cs) have been theoretically analyzed. Partial differential equations resulting from a surface reaction followed by three possible modes of penetration, a) simple diffusion, b) interdiffusion, and c) double diffusion of Cs, were numerically solved by means of a finite-difference technique. A model in which aqueous Cs+ is assumed to react rapidly with a...

Topics: DTIC Archive, Frueholz, R. P., AEROSPACE CORP EL SEGUNDO CA CHEMISTRY AND PHYSICS LAB, *DIFFUSION,...

A new basic microscopic theory of association/dissociation processes in dense gases has been developed. Expressions for the time-dependent rates R (subscript A, D)(t) for the association/dissociation of atomic or molecular species A and B in a gas M are formulated in terms of the net probability P sub i (superscript A, D) for association/dissociation of bound energy level i of the pair (A-B). A new Variational Principle for these rates is proposed and is applied to ion-ion recombination, as a...

Topics: DTIC Archive, Flannery,M R, GEORGIA INST OF TECH ATLANTA SCHOOL OF PHYSICS, *REACTION KINETICS,...

Several notions of stochastic convexity and concavity and their properties are studied in this paper. Efficient sample path approaches are developed in order to verify the occurrence of these notions in various applications. Numerous examples are given. The use of these notions in several areas of probability and statistics is demonstrated. In queueing theory, the convexity (as a function of c) of the steady state mean waiting time in a GI/D/c queue, and as a function of the arrival and service...

Topics: DTIC Archive, Shaked,Moshe, ARIZONA UNIV TUCSON DEPT OF MATHEMATICS, *STOCHASTIC PROCESSES, STEADY...

This thesis evaluates the survivability of the hardened mobile launcher system (HML) against a hypothetical enemy ICBM system. The hypothetical system has two key capabilities: it can obtain near real-time intelligence information regarding the HML's location, and it can be retargeted in flight (as necessary) according to the intelligence information. Thus, the hypothetical ICBM threat systems can attack individual HMLs directly rather than rely on a 'barrage attack' against HML bases. Monte...

Topics: DTIC Archive, Gearhart,David J, AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF...

Let tau sub 1 be the class of all procedures for monitoring the variance of a process at level alpha using control charts based on statistics (T (Y1), T(Y2),...) from independent random samples. Suppose the control variance squared sigma sub zero is known. Under Gaussian assumptions the squared S chart using the sample variance is shown to be optimal in the class tau sub 1 in that its run length is stochastically smallest under both stationary and drifting processes not in control. Weaker...

Topics: DTIC Archive, Jensen,D R, VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG, *STATISTICAL TESTS,...

We study homogenization of linear dynamic thermoelasticity with rapidly varying coefficients, using a semi-group approach. The resulting homogenized problem exhibits an unusual change in initial temperature. A formal asymptotic analysis predicts fast time oscillations in the temperature field. These oscillations explain the temperature shift, and show that, for our problem, weak convergence in time in the best convergence that one can obtain. (Author)

Topics: DTIC Archive, Francfort,Gilles A, STANFORD UNIV CA DIV OF APPLIED MECHANICS, *THERMOMECHANICS,...

A program is called arithmetical if it is obtained from a flowchart schema under an interpretation in which the domain consists of non-negative integers and the assigned functions and predicates are arithmetical in the sense of Goedel. The computation done by arithmetical programs is characterized in terms of arithmetical predicates. This is a first-order formalization, compared to the second-order, Cooper-Manna formalization. It is shown that for the class of arithmetical programs, the problem...

Topics: DTIC Archive, Abdali, S Kamal, RENSSELAER POLYTECHNIC INST TROY NY DEPT OF MATHEMATICAL SCIENCES,...

A program is called arithmetical if it is obtained from a flowchart schema under an interpretation in which the domain consists of non-negative integers and the assigned functions and predicates are arithmetical in the sense of Goedel. The computation done by arithmetical programs is characterized in terms of arithmetical predicates. This is a first-order formalization, compared to the second-order, Cooper-Manna formalization. It is shown that for the class of arithmetical programs, the problem...

Topics: DTIC Archive, Abdali, S Kamal, RENSSELAER POLYTECHNIC INST TROY NY DEPT OF MATHEMATICAL SCIENCES,...

In this paper we study a history-boundary value problem for a nonlinear conservation with fading memory in one space dimension. The motivation for studying this problem is an earlier work by C. M. Dafermos and the author concerning the motion of a nonlinear, one-dimensional viscoelastic body. Using a variant of an energy method applied to the viscoelastic problem it is shown that under physically reasonable assumptions the nonlinear conservation law has a unique, classical solution (global in...

Topics: DTIC Archive, Nohel,J A, WISCONSIN UNIV-MADISON MATHEMATICS RESEARCH CENTER, *ONE DIMENSIONAL,...

In this paper we study a history-boundary value problem for a nonlinear conservation with fading memory in one space dimension. The motivation for studying this problem is an earlier work by C. M. Dafermos and the author concerning the motion of a nonlinear, one-dimensional viscoelastic body. Using a variant of an energy method applied to the viscoelastic problem it is shown that under physically reasonable assumptions the nonlinear conservation law has a unique, classical solution (global in...

Topics: DTIC Archive, Nohel,J A, WISCONSIN UNIV-MADISON MATHEMATICS RESEARCH CENTER, *ONE DIMENSIONAL,...

In this paper we study a history-boundary value problem for a nonlinear conservation with fading memory in one space dimension. The motivation for studying this problem is an earlier work by C. M. Dafermos and the author concerning the motion of a nonlinear, one-dimensional viscoelastic body. Using a variant of an energy method applied to the viscoelastic problem it is shown that under physically reasonable assumptions the nonlinear conservation law has a unique, classical solution (global in...

Topics: DTIC Archive, Nohel,J A, WISCONSIN UNIV-MADISON MATHEMATICS RESEARCH CENTER, *ONE DIMENSIONAL,...

This paper describes an algorithm for compressing the spectral representation of an utterance along the time axis while keeping the main features intact. The goal of the algorithm is to save template storage space and to reduce the time required for recognition. For 8 speakers, 5 data sets each, the results indicated that we can save about 40% of the template space and 35% of the recognition time with only a slightly higher error rate.

Topics: DTIC Archive, Li, Zongge, CARNEGIE-MELLON UNIV PITTSBURGH PA DEPT OF COMPUTER SCIENCE, *SPEECH...