Now showing items 923-942 of 1107

    • Signal Transform Covariant to Scale Changes 

      Baraniuk, Richard G. (1993-09-01)
      A unitary signal transformation that is covariant by translation to scale changes (dilations and compressions) in the signal is formulated and justified. Unlike the Mellin transform, which is invariant to scale changes, ...
    • Signal-Dependent Time-Frequency Analysis using a Radially Gaussian Kernel 

      Baraniuk, Richard G.; Jones, Douglas L. (1993-01-15)
      Time-frequency distributions are two-dimensional functions that indicate the time-varying frequency content of one-dimensional signals. Each bilinear time-frequency distribution corresponds to a kernel function that ...
    • A Signal-Dependent Time-Frequency Representation: Fast Algorithm for Optimal Kernel Design 

      Baraniuk, Richard G.; Jones, Douglas L. (1994-01-01)
      A time-frequency representation based on an optimal, signal-dependent kernel has been proposed recetnly in an attempte to overcome one of the primary limitations of bilinear time-frequency distributions: that the best ...
    • A Simple Covariance Based Characterization of Joint Signal Representations of Arbitrary Variables 

      Jones, Douglas L.; Sayeed, Akbar M. (1996-01-20)
      Joint signal representations of arbitrary variables extend the scope of joint time-frequency representations, and provide a useful description for a wide variety of nonstationary signal characteristics. Cohen's marginal-based ...
    • A Simple Scheme for Adapting Time-Frequency Representations 

      Jones, Douglas L.; Baraniuk, Richard G. (1994-12-01)
      Signal-dependent time-frequency representations, by adapting their functional form to fit the signal being analyzed, offer many performance advantages over conventional representations. In this paper, we propose a simple, ...
    • A Simple Scheme for Adapting Time-Frequency Representations 

      Jones, Douglas L.; Baraniuk, Richard G. (1992-10-01)
      Current signal-dependent time-frequency representations are block-oriented methods suited only for short-duration signals. The authors propose a simple, computationally efficient technique for creating adaptive time-frequency ...
    • A Simple Statistical Analysis of Wavelet-based Multifractal Spectrum Estimation 

      Goncalves, Paulo; Riedi, Rudolf H.; Baraniuk, Richard G. (1998-11-01)
      The multifractal spectrum characterizes the scaling and singularity structures of signals and proves useful in numerous applications, from network traffic analysis to turbulence. Of great concern is the estimation of the ...
    • Simplified Wavelet-Domain Hidden Markov Models using Contexts 

      Crouse, Matthew; Baraniuk, Richard G. (1998-05-01)
      Wavelet-domain hidden Markov models (HMMs) are a potent new tool for modeling the statistical properties of wavelet transforms. In addition to characterizing the statistics of individual wavelet coefficients, HMMs capture ...
    • Simulation of Non-Gaussian Long-Range-Dependent Traffic using Wavelets 

      Ribeiro, Vinay Joseph; Riedi, Rudolf H.; Crouse, Matthew; Baraniuk, Richard G. (1999-05-01)
      In this paper, we develop a simple and powerful multiscale model for the synthesis of non-Gaussian, long-range dependent (LRD) network traffic. Although wavelets effectively decorrelate LRD data, wavelet-based models have ...
    • Simulation of Systolic Arrays on the Connection Machine 

      Hemkumar, Nariankadu D.; Cavallaro, Joseph R. (1993-09)
      The use of a programming model which extends naturally from the underlying hardware, greatly eases the design and implementation of simulators, especially for those systems that resemble the hardware in the paradigm of ...
    • Simulation of Systolic Arrays On The Connection Machine 

      Hemkumar, Nariankadu D.; Cavallaro, Joseph R. (1993-09-20)
      The use of a programming model which extends naturally from the underlying hardware, greatly eases the design and implementation of simulators, especially for those systems that resemble the hardware in the paradigm of ...
    • Simultaneous Speckle Reduction and Data Compression using Best Wavelet Packet Bases with Applications to SAR based ATD/R 

      Wei, Dong; Guo, Haitao; Odegard, Jan E.; Lang, Markus; Burrus, C. Sidney (1995-04-20)
      We propose a novel method for simultaneous speckle reduction and data compression based on shrinking, quantizing and coding the wavelet packet coefficients of the logarithmically transformed image. A fast algorithm is used ...
    • Single-Molecule FRET Studies of HIV TAR–DNA Hairpin Unfolding Dynamics 

      Chen, Jixin; Poddar, Nitesh K.; Tauzin, Lawrence J.; Cooper, David; Kolomeisky, Anatoly B.; Landes, Christy F. (2014)
      We directly measure the dynamics of the HIV trans-activation response (TAR)-DNA hairpin with multiple loops using single-molecule Förster resonance energy transfer (smFRET) methods. Multiple FRET states are identified that ...
    • Single-Particle Absorption Spectroscopy by Photothermal Contrast 

      Yorulmaz, Mustafa; Nizzero, Sara; Hoggard, Anneli; Wang, Lin-Yung; Cai, Yiyu; Su, Man-Nung; Chang, Wei-Shun; Link, Stephan (2015)
      Removing effects of sample heterogeneity through single-molecule and single-particle techniques has advanced many fields. While background free luminescence and scattering spectroscopy is widely used, recording the absorption ...
    • Single-Particle Spectroscopy Reveals Heterogeneity in Electrochemical Tuning of the Localized Surface Plasmon 

      Byers, Chad P.; Hoener, Benjamin S.; Chang, Wei-Shun; Yorulmaz, Mustafa; Link, Stephan; Landes, Christy F. (2014)
      A hyperspectral imaging method was developed that allowed the identification of heterogeneous plasmon response from 50 nm diameter gold colloidal particles on a conducting substrate in a transparent three-electrode ...
    • Slender PUF Protocol: A lightweight, robust, and secure authentication by substring matching 

      Majzoobi, Mehrdad; Rostami, Masoud; Koushanfar, Farinaz; Wallach, Dan S.; Devadas, Srinivas (2012)
      We introduce Slender PUF protocol, an efficient and secure method to authenticate the responses generated from a Strong Physical Unclonable Function (PUF). The new method is lightweight, and suitable for energy constrained ...
    • Small-Time Scaling Behavior of Internet Backbone Traffic 

      Ribeiro, Vinay Joseph; Zhang, Zhi-Li; Moon, Sue; Diot, Christophe (2005-06-01)
      We perform an extensive wavelet analysis of Internet backbone traffic signals to observe and understand the causes of small-time (sub-seconds) scaling phenomena present in them. We observe that for a majority of the traffic ...
    • Small-time scaling behaviors of Internet backbone traffic: An empirical study 

      Zhang, Zhi-Li; Ribeiro, Vinay Joseph; Moon, Sue; Diot, Christophe (2003-04-20)
      We study the small-time (sub-seconds) scaling behaviors of Internet backbone traffic, based on traces collected from OC3/12/48 links in a tier-1 ISP. We observe that for a majority of these traces, the (second-order) scaling ...
    • Smooth biorthogonal wavelets for applications in image compression 

      Odegard, Jan E.; Burrus, C. Sidney (1996-09-20)
      In this paper we introduce a new family of smooth, symmetric biorthogonal wavelet basis. The new wavelets are a generalization of the Cohen, Daubechies and Feauveau (CDF) biorthogonal wavelet systems. Smoothness is controlled ...
    • Snapshot 3D optical coherence tomography system using image mapping spectrometry 

      Nguyen, Thuc-Uyen; Pierce, Mark C.; Higgins, Laura; Tkaczyk, Tomasz S. (2013)
      A snapshot 3-Dimensional Optical Coherence Tomography system was developed using Image Mapping Spectrometry. This system can give depth information (Z) at different spatial positions (XY) within one camera integration time ...