Now showing items 1-60 of 1066

  • The 2nu-SVM: A Cost-Sensitive Extension of the nu-SVM 

    Davenport, Mark A. (2005-12-01)
    Standard classification algorithms aim to minimize the probability of making an incorrect classification. In many important applications, however, some kinds of errors are more important than others. In this report we ...
  • 3-D Local Radon Power Spectra for Seismic Attribute Extraction 

    Steeghs, Philippe; Fokkema, Jacob T; Diephuis, Gerhard (1998-01-15)
    In this paper we discuss a method for volume attribute extraction that is based on a new type of local Radon power spectrum. The new algorithm results in robust and geologically meaningful volume attributes, such as ...
  • 3D Geometry Coding using Mixture Models and the Estimation Quantization Algorithm 

    Lavu, Sridhar (2002-09-01)
    3D surfaces are used in applications such as animations, 3D object modeling and visualization. The geometries of such surfaces are often approximated using polygonal meshes. This thesis aims to compress 3D geometry meshes ...
  • 3D microfabrication of single-wall carbon nanotube/polymer composites by two-photon polymerization lithography 

    Ushiba, Shota; Shoji, Satoru; Masui, Kyoko; Kuray, Preeya; Kono, Junichiro; Kawata, Satoshi (2013)
    We present a method to develop single-wall carbon nanotube (SWCNT)/polymer composites into arbitrary three-dimensional micro/nano structures. Our approach, based on two-photon polymerization lithography, allows one to ...
  • 802.11b Operating in a Mobile Channel: Performance and Challenges 

    Steger, Christopher; Radosavljevic, Predrag; Frantz, Patrick (2003-09-20)
    In the past, the worlds of wireless voice and data transmission have been largely disjoint. Voice traffic has been carried over circuit-switched cellular links, and data has been largely restricted to packet-switched ...
  • Accelerating Computer Vision Algorithms Using OpenCL Framework on Mobile Devices - A Case Study 

    Wang, Guohui; Xiong, Y.; Yun, Jay; Cavallaro, Joseph R. (2013-06)
    Recently, general-purpose computing on graphics processing units (GPGPU) has been enabled on mobile devices thanks to the emerging heterogeneous programming models such as OpenCL. The capability of GPGPU on mobile devices ...
  • Achievable Diversity and Multiplexing in Multiple Antenna Systems with Quantized Power Control 

    Khoshnevis, Ahmad; Sabharwal, Ashutosh (2005-05-01)
    We consider a multiple antenna system with finite rate feedback, in which the quantized channel state information at the transmitter is used solely for temporal power control. We show that similar to systems without feedback, ...
  • Achievable Rates for Arbitrary Network Topologies with â Cheapâ Nodes 

    Khojastepour, Mohammad; Sabharwal, Ashutosh; Aazhang, Behnaam (2003-05-01)
    In this paper, we derive achievable rates for arbitrary network topologies consisting of â cheapâ nodes. A node is labeled â cheapâ if its radio can only operate in TDD mode when transmitting and receiving in the ...
  • Achromatized endomicroscope objective for optical biopsy 

    Kyrish, Matthew; Tkaczyk, Tomasz S. (2013-01-18)
    Currently, researchers and clinicians lack achromatized endomicroscope objectives that are as narrow as biopsy needles. We present a proof-of-concept prototype that validates the optical design of an NA0.4 objective. ...
  • Active dielectric antenna on chip for spatial light modulation 

    Qiu, Ciyuan; Chen, Jianbo; Xia, Yang; Xu, Qianfan (2012-11-14)
    Integrated photonic resonators are widely used to manipulate light propagation in an evanescently-coupled waveguide. While the evanescent coupling scheme works well for planar optical systems that are naturally waveguide ...
  • Adaptive Fault Detection and Tolerance for Robots 

    Visinsky, Monica L.; Cavallaro, Joseph R.; Walker, Ian D. (1994-08-01)
    In existing robot fault detection schemes, sensed values of the joint status (position, velocity, etc.) are typically compared against expected or desired values, and if a given threshold is exceeded, a fault is inferred. ...
  • Adaptive Iterative Reqeighted Least Squares Design of LP FIR Filters 

    Vargas, Ricardo; Burrus, C. Sidney (1999-03-01)
    This paper presents an efficient adaptive algorithm for designing FIR digital filters that are efficient according to an Lp error criteria. The algorithm is an extension of Burrus' iterative reweighted least-squares (IRLS) ...
  • An Adaptive Optimal-Kernel Time-Frequency Representation 

    Jones, Douglas L.; Baraniuk, Richard G. (1995-10-01)
    Time-frequency representations with fixed windows or kernels figure prominently in many applications, but perform well only for limited classes of signals. Representations with signal- dependent kernels can overcome this ...
  • An Adaptive Orthogonal-Series Estimator for Probability Density Functions 

    Anderson, G. Leigh; de Figueiredo, Rui J.P. (1978-02-20)
    Given a sample set X1,...,XN of independent identically distributed real-valued random variables, each with the unknown probability density function f(â ¢), the problem considered is to estimate f from the sample set. The ...
  • Adaptive Representation of JPEG 2000 Images Using Header-based Processing 

    Neelamani, Ramesh; Berkner, Kathrin (2002-09-20)
    To bridge the mismatch between the sizes of images and display devices, we present an efficient and automatic algorithm to create an adaptive image representation called SmartNail. Given a digital image and rectangular ...
  • Adaptive Wavelet Transforms for Image Coding 

    Claypoole, Roger L.; Davis, Geoffrey; Sweldens, Wim; Baraniuk, Richard G. (1997-11-01)
    We introduce a new adaptive transform for wavelet-based image coding. The lifting framework for wavelet construction motivates our analysis and provides new insight into the problem. Since the adaptive transform is non-linear, ...
  • Adaptive Wavelet Transforms for Image Coding 

    Claypoole, Roger L.; Davis, Geoffrey; Sweldens, Wim; Baraniuk, Richard G. (1997-11-01)
    We introduce a new adaptive transform for wavelet-based image coding. The lifting framework for wavelet construction motivates our analysis and provides new insight into the problem. Since the adaptive transform is non-linear, ...
  • Adaptive Wavelet Transforms for Image Coding using Lifting 

    Claypoole, Roger L.; Davis, Geoffrey; Sweldens, Wim; Baraniuk, Richard G. (1998-03-01)
    Summary form only given. Image compression relies on efficient representations of images, and within smooth image regions, the wavelet transform provides such a representation. However, near edges, wavelet coefficients ...
  • Adaptive Wavelet Transforms via Lifting 

    Claypoole, Roger L.; Baraniuk, Richard G.; Nowak, Robert David (1999-05-01)
    This paper develops new algorithms for adapted multiscale analysis and signal adaptive wavelet transforms. We construct our adaptive transforms with the <i>lifting scheme</i>, which decomposes the wavelet transform into ...
  • Adaptive Wavelet Transforms via Lifting 

    Claypoole, Roger L.; Baraniuk, Richard G.; Nowak, Robert David (1999-01-15)
    This paper develops new algorithms for adapted multiscale analysis and signal adaptive wavelet transforms. We construct our adaptive transforms with the <i>lifting scheme</i>, which decomposes the wavelet transform into ...
  • Adaptive Wavelet Transforms via Lifting 

    Claypoole, Roger L.; Baraniuk, Richard G.; Nowak, Robert David (1998-05-01)
    This paper develops two new adaptive wavelet transforms based on the lifting scheme. The lifting construction exploits a spatial-domain, prediction-error interpretation of the wavelet transform and provides a powerful ...
  • Adaptive Weighted Highpass Filters Using Multiscale Analysis 

    Nowak, Robert David; Baraniuk, Richard G. (1998-07-01)
    In this paper, we propose a general framework for studying a class of weighted highpass filters. Our framework, based on a multiscale signal decomposition, allows us to study a wide class of filters and to assess the ...
  • Adding Linguistic Constraints to Document Image Decoding: Comparing the Iterated Complete Path and Stack Algorithms 

    Popat, Kris; Greene, Dan; Romberg, Justin; Bloomberg, Dan (2001-01-20)
    Beginning with an observed document image and a model of how the image has been degraded, Document Image Decoding recognizes printed text by attempting to find a most probable path through a hypothesized Markov source. The ...
  • Additive and Multiplicative Mixture Trees for Network Traffic Modeling 

    Sarvotham, Shriram; Wang, Xuguang; Riedi, Rudolf H.; Baraniuk, Richard G. (2002-05-01)
    Network traffic exhibits drastically different statistics, ranging from nearly Gaussian marginals and long range dependence at very large time scales to highly non-Gaussian marginals and multifractal scaling on small scales. ...
  • Adsorption of a Protein Monolayer via Hydrophobic Interactions Prevents Nanoparticle Aggregation under Harsh Environmental Conditions 

    Dominguez-Medina, Sergio; Blankenburg, Jan; Olson, Jana; Landes, Christy F.; Link, Stephan (2013)
    We find that citrate-stabilized gold nanoparticles aggregate and precipitate in saline solutions below the NaCl concentration of many bodily fluids and blood plasma. Our experiments indicate that this is due to complexation ...
  • Advanced MIMO-CDMA Receiver for Interference Suppression: Algorithms, System-on-Chip Architectures and Design Methodology 

    Guo, Yuanbin (2005-05-01)
    MIMO (Multiple Input Multiple Output) technology is proposed in CDMA systems for much higher rate packet services. The receiver architecture is essential for the mobile devices to support high speed multimedia service. ...
  • Advanced Techniques for Next-Generation Wireless Systems 

    Sendonaris, Andrew (1999-08-20)
    In order to meet the demands of next-generation wireless systems, which will be required to support multirate multimedia at high data rates, it is necessary to employ advanced algorithms and techniques that enable the ...
  • An Algorithm for Extraction of More than One Optimal Linear Feature from Several Gaussian Pattern Classes 

    de Figueiredo, Rui J.P.; Pau, K.C.; Sagar, A. D.; Starks, S.A.; Van Rooy, D.L. (1976-04-20)
    Two algorithms have been developed at Rice University for optimal linear feature extraction based on the minimization risk (probability) of misclassification under the assumption that the class conditional probability ...
  • An Algorithm for Optimal Single Linear Feature Extraction from Several Gaussian Pattern Classes 

    Starks, S.A.; de Figueiredo, Rui J.P.; Van Rooy, D.L. (1975-11-20)
    A computational algorithm is presented for the extraction of an optimal single linear feature from several Gaussian pattern classes. The algorithm minimizes the increase in the probability of misclassification in the ...
  • An Algorithm to Factor Polynomial Matrices 

    Kontos, Athanassios (1979-04-01)
    A new algorithm for factoring polynomial matrices, based on concept of elementary factors, is presented in this report. This algorithm does not use numerically unsatisfactory Euclidean type operations.
  • Algorithms and Architectures for Channel Estimation in Wireless CDMA Communication Systems 

    Sengupta, Chaitali (1998-12-20)
    Wireless cellular communication is witnessing a rapid growth in markets, technology, and range of services. An attractive approach for economical, spectrally efficient, and high quality digital cellular and personal ...
  • Algorithms for Optimal Dynamic Assignment in Distributed Processing Systems 

    Sinclair, J. Bartlett (1979-08-20)
    The problem of determining an optimal dynamic assignment of a modular program in a loosely coupled distributed processing system is considered. An optimal dynamic assignment minimizes the sum of all module execution costs, ...
  • Algorithms for Optimal Numerical Quadrature Based on Signal Class Models 

    de Figueiredo, Rui J.P. (1979-11-01)
    A framework is presented for constructing various types of numerical quadrature algorithms which take into account the a-priori known or estimated properties of the signal being processed. This is done by appropriately ...
  • All-optical CDMA with bipolar codes 

    Nguyen, Lim; Aazhang, Behnaam; Young, James F. (1995-03-20)
    A method for the transmission and detection of bipolar sequences in a unipolar system is presented. It allows all-optical implementation, in noncoherent optical CDMA systems, of the bipolar codes that have been developed ...
  • Allpass Filter Design and Applications 

    Lang, Markus (1995-01-15)
    The Problem of allpass filter design for phase approximation and equalization in the Chebyshev sense is solved by using a generalized Remez algorithm. Convergence to the unique optimum is guaranteed and is achieved rapidly ...
  • Aluminum Nanocrystals 

    McClain, Michael J.; Schlather, Andrea E.; Ringe, Emilie; King, Nicholas S.; Liu, Lifei; Manjavacas, Alejandro; Knight, Mark W.; Kumar, Ish; Whitmire, Kenton; Everitt, Henry O.; Nordlander, Peter; Halas, Naomi J. (2015)
    We demonstrate the facile synthesis of high purity aluminum nanocrystals over a range of controlled sizes from 70 to 220 nm diameter with size control achieved through a simple modification of solvent ratios in the reaction ...
  • Ambipolar electronics 

    Yang, Xuebei; Mohanram, Kartik (2010-03-02)
    Ambipolar conduction, characterized by a superposition of electron and hole currents, has been observed in many next-generation devices including carbon nanotube, graphene, silicon nanowire, and organic transistors. ...
  • Analog Computer Simulation of Maximum Expiratory Flow Limitation 

    Olender, Mark F.; Clark, Jr., J.W.; Stevens, P.M. (1975-01-20)
    This paper extends previous modeling work in our laboratory on the simulation of the panting maneuver executed in a body plethysmograph [Golden, et al. (1973)] to the simulation of a wider range of pulmonary function tests ...
  • Analysis of Decision-Feedback Based Broadband OFDM Systems 

    de Baynast, Alexandre; Sabharwal, Ashutosh; Aazhang, Behnaam (2005-11-01)
    In wireless communications, about 25% of the bandwidth is dedicated to training symbols for channel estimation. By using a semi-blind approach, the training sequence length can be reduced while improving performance. The ...
  • Analysis of Multiscale Texture Segmentation using Wavelet-Domain Hidden Markov Trees 

    Choi, Hyeokho; Hendricks, Brent; Baraniuk, Richard G. (1999-10-01)
    This paper describes a technique for estimating the Kullback-Leibler (KL) distance between two Hidden Markov Models (HMMs), and for measuring the quality of the estimator. It also provides some results based on applying ...
  • Analysis of noise reduction in redundant expansions under distributed processing requirements 

    Rozell, Chris; Johnson, Don (2005-03-01)
    We considered signal reconstruction with redundant expansions under distributed processing in noisy environments. Redundant expansions have the ability to reduce noise corrupting the coefficients, but distributed processing ...
  • Analysis of Robots for Hazardous Environments 

    Harpel, Barbara McLaughlin; Dugan, Joanne Bechta; Walker, Ian D.; Cavallaro, Joseph R. (1997-01-01)
    Reliability analysis of fault tolerant systems often ignores the small probability that a failure might not be detected or, if detected, may not be properly handled. The probability that the failure is detected and properly ...
  • Analysis of the DCS one-stage Greedy Algorothm for Common Sparse Supports 

    Baron, Dror; Duarte, Marco F.; Wakin, Michael; Sarvotham, Shriram; Baraniuk, Richard G. (2005-11-01)
    Analysis of the DCS one-stage Greedy Algorothm for Common Sparse Supports
  • Analysis of Wavelet domain Wiener Filters 

    Choi, Hyeokho; Baraniuk, Richard G. (1998-10-01)
    We investigate Wiener filtering of wavelet coefficients for signal denoising. Empirically designed wavelet-domain Wiener filters outperform many other denoising algorithms based on wavelet thresholding. However, up to now, ...
  • Analytic Evaluation of Shared-Memory Systems with ILP Processors 

    Sorin, Daniel J.; Pai, Vijay S.; Adve, Sarita V.; Vernon, Mary K.; Wood, David A. (1998-06-20)
    None
  • Analyzing Dynamics and Stimulus Feature Dependence in the Information Processing of Crayfish Sustaining Fibers 

    Rozell, Chris (2002-04-20)
    The sustaining fiber (SF) stage of the crayfish visual system converts analog stimulus representations to spike train signals. A recent theory quantifies a system's information processing capabilities and relates to ...
  • Analyzing the robustness of redundant population codes in sensory and feature extraction systems 

    Rozell, Chris; Johnson, Don (2005-07-01)
    Sensorineural systems often use groups of redundant neurons to represent stimulus information both during transduction and population coding of features. This redundancy makes the system more robust to corruption in the ...
  • Antenna Arrays for Wireless CDMA Communication Systems 

    Madyastha, Raghu (1997-05-20)
    The estimation of code delays along with amplitudes and phases of different users constitutes the first stage in the demodulation process in a CDMA communication system. The delay estimation stage is termed the acquisition ...
  • Antenna Packing in Low Power Systems: Communication Limits and Array Design 

    Muharemovic, Tarik; Sabharwal, Ashutosh; Aazhang, Behnaam (2005-01-01)
    In this paper, we study design of transceiver antenna arrays and its impact on spectral efficiency of low-power systems. Our primary motivation is construction of practical and portable multi-antenna configurations with a ...
  • APL Programs for Polynomial Matrix Manipulations 

    Kontos, Athanassios (1979-12-01)
    This report contains descriptions and listings of APL programs.
  • APL Programs for Singular Value Decomposition and Generalized Eigenvalue Problems 

    Kontos, Athanassios; Moore, Robert (1979-09-20)
    This report contains descriptions and listings of APL functions for singular value decomposition and solution of the generalized eigenvalue problem.
  • APL Programs for the Solution of RPIS 

    Prescott, Richard; Moore, Robert (1978-08-20)
    This report contains the documentaiton for twelve APL functions written to facilitate the solution of the Regulator Problem with Internal Stability (RPIS). These new functions draw on the library of APL functions assembled ...
  • Application of a Frequency Domain Prony Method to Wide Bandwidth Radar Signature Classification 

    de Figueiredo, Rui J.P.; Hu, C.L. (1979-09-20)
    A frequency domain Prony approach is presented for extracting features of return signals from targets illuminated by wide bandwidth (short pulse) radar. Theoretical details pertaining to this approach are described in a ...
  • Application-Specific Accelerators for Communications 

    Sun, Yang; Amiri, Kiarash; Brogioli, Michael; Cavallaro, Joseph R. (2010-01-01)
    For computation-intensive digital signal processing algorithms, complexity is exceeding the processing capabilities of general-purpose digital signal processors (DSPs). In some of these applications, DSP hardware accelerators ...
  • Applications of Adaptive Time Frequency Representations to Underwater Acoustic Signal Processing 

    Baraniuk, Richard G.; Jones, Douglas L.; Tom, Brotherton; Larry, Marple (1991-11-01)
    The authors describe the application of an adaptive optimal kernel (AOK) time-frequency representation to the processing of underwater acoustic data. The optimal kernel is a signal-dependent radially Gaussian function. ...
  • Applications of Terahertz Imaging 

    Mittleman, Daniel M.; Neelamani, Ramesh; Baraniuk, Richard G.; Nuss, Martin C. (1998-08-01)
    The recent advances involving imaging with sub-picosecond terahertz pulses have opened up a wide range of possibilities in the applications of far-infrared technology. For the first time, a commercially viable terahertz ...
  • An Approach to Capacity Analysis of Coarsely Coordinated Low Power Multiple Access Systems 

    Muharemovic, Tarik; Sabharwal, Ashutosh; Aazhang, Behnaam (2004-07-01)
    We consider multiaccess problem in low power systems, where we allow each user to select its own data rate and transmit power locally and independently from other users. Here, every user has a set of low power codebooks, ...
  • Approximate continuous wavelet transform with an application to noise reduction 

    Lewis, James M.; Burrus, C. Sidney (1998-05-20)
    We describe a generalized scale-redundant wavelet transform which approximates a dense sampling of the continuous wavelet transform (CWT) in both time and scale. The dyadic scaling requirement of the usual wavelet ...
  • Approximate Matrix Inversion for High-Throughput Data Detection in Large-Scale MIMO Uplink 

    Wu, M.; Yin, B.; Vosoughi, A.; Studer, C.; Cavallaro, Joseph R.; Dick, C. (2013-05)
    The high processing complexity of data detection in the large-scale multiple-input multiple-output (MIMO) uplink necessitates high-throughput VLSI implementations. In this paper, we propose—to the best of our knowledge—first ...
  • Approximation and Compression of Piecewise Smooth Images Using a Wavelet/Wedgelet Geometric Model 

    Romberg, Justin; Wakin, Michael; Baraniuk, Richard G. (2003-09-01)
    Inherent to photograph-like images are two types of structures: large smooth regions and geometrically smooth edge contours separating those regions. Over the past years, efficient representations and algorithms have been ...