Now showing items 788-807 of 1051

  • QEPAS based ppb-level detection of CO and N2O using a high power CW DFB-QCL 

    Ma, Yufei; Lewicki, Rafał; Razeghi, Manijeh; Tittel, Frank K. (2013-01-14)
    An ultra-sensitive and selective quartz-enhanced photoacoustic spectroscopy (QEPAS) sensor platform was demonstrated for detection of carbon monoxide (CO) and nitrous oxide (N2O). This sensor used a stateof- the art ...
  • QRD-QLD searching based sphere detection for emerging MIMO downlink OFDM receivers 

    Radosavljevic, Predrag; Kim, Kyeong Jin; Cavallaro, Joseph R. (2008-11-01)
    In this paper, a detection algorithm with parallel partial candidate-search algorithm is presented. Two fully independent partial search processes are simultaneously employed for two groups of transmit antennas based on ...
  • Quantifying spectral changes experienced by plasmonic nanoparticles in a cellular environment to inform biomedical nanoparticle design 

    Chen, Allen L.; Hu, Ying S.; Jackson, Meredith A.; Lin, Adam Y.; Young, Joseph K.; Langsner, Robert J.; Drezek, Rebekah A. (2014)
    Metal nanoparticles (NPs) scatter and absorb light in precise, designable ways, making them agile candidates for a variety of biomedical applications. When NPs are introduced to a physiological environment and interact ...
  • Quantization of Sparse Representations 

    Boufounos, Petros T.; Baraniuk, Richard G. (2007-01-16)
    Compressive sensing (CS) is a new signal acquisition technique for sparse and compressible signals. Rather than uniformly sampling the signal, CS computes inner products with randomized basis functions; the signal is then ...
  • Quantum Cascade Laser Spectrometer for Trace-Gas Detection of Exhaled Carbonyl Sulfide 

    Wysocki, Gerard; So, Stephen; McCurdy, Matthew; Roller, Chad; Weidman, Daniel; Frantz, Patrick; Curl, Robert; Tittel, Frank K. (2004-05-01)
    Simultaneous concentration measurements of echaled carbonyl sulfide and carbon dioxide were demonstrated using a pulsed quantum cascade laser based gas sensor. This sensor has potential applications in biomedical diagnostics ...
  • Quartz-Enhanced Photoacoustic Spectroscopy: A Review 

    Patimisco, Pietro; Scamarcio, Gaetano; Tittel, Frank K.; Spagnolo, Vincenzo (2014)
    A detailed review on the development of quartz-enhanced photoacoustic sensors (QEPAS) for the sensitive and selective quantification of molecular trace gas species with resolved spectroscopic features is reported. The basis ...
  • Quasi-Circular Rotation Invariance in Image Denoising 

    Wan, Yi; Nowak, Robert David (1999-10-20)
    This paper studies a new method for wavelet-based image denoising which is translation invariant (TI) <b>and</b> rotation invariant (RI). These invariances are crucial in image denoising and, more generally, may play ...
  • Quaternion Wavelets for Image Analysis and Processing 

    Chan, Wai Lam; Choi, Hyeokho; Baraniuk, Richard G. (2004-10-01)
    Using the concepts of two-dimensional Hubert transform and analytic signal, we construct a new quaternion wavelet transform (QWT). The QWT forms a tight frame and can be efficiently computed using a-2-D dual-tree filter ...
  • Queuing analysis of long-range-dependent traffic 

    Ribeiro, Vinay Joseph (1998-04-20)
    None
  • A Radially-Gaussian, Signal-Dependent Time-Frequency Representation 

    Baraniuk, Richard G.; Jones, Douglas L. (1991-04-01)
    An optimization formulation for designing signal-dependent kernels that are based on radially Gaussian functions is presented. The method is based on optimality criteria and is not ad hoc. The procedure is automatic. The ...
  • Random Filters for Compressive Sampling and Reconstruction 

    Baraniuk, Richard G.; Wakin, Michael; Duarte, Marco F.; Tropp, Joel A.; Baron, Dror (2006-05-01)
    We propose and study a new technique for efficiently acquiring and reconstructing signals based on convolution with a fixed FIR filter having random taps. The method is designed for sparse and compressible signals, i.e., ...
  • Random Projections of Signal Manifolds 

    Wakin, Michael; Baraniuk, Richard G. (2006-05-01)
    Random projections have recently found a surprising niche in signal processing. The key revelation is that the relevant structure in a signal can be preserved when that signal is projected onto a small number of random ...
  • Random Projections of Smooth Manifolds 

    Baraniuk, Richard G.; Wakin, Michael (2006-10-01)
    Many types of data and information can be described by concise models that suggest each data vector (or signal) actually has â few degrees of freedomâ relative to its size N. This is the motivation for a variety of ...
  • Rapid and Continuous Modulation of Hippocampal Network State during Exploration of New Places 

    Kemere, Caleb; Carr, Margaret F.; Karlsson, Mattias P.; Frank, Loren M. (2013-09)
    Hippocampal information processing is often described as two-state, with a place cell state during movement and a reactivation state during stillness. Relatively little is known about how the network transitions between ...
  • Rapid fabrication of miniature lens arrays by four-axis single point diamond machining 

    McCall, Brian; Tkaczyk, Tomasz S. (2013-02-11)
    A novel method for fabricating lens arrays and other nonrotationally symmetric free-form optics is presented. This is a diamond machining technique using 4 controlled axes of motion – X, Y, Z, and C. As in 3-axis diamond ...
  • Rapid Industrial Prototyping and Scheduling of 3G/4G SoC Architectures with HLS Methodology 

    Guo, Yuanbin; McCain, Dennis; Cavallaro, Joseph R. (2005-12-01)
    In this paper, we present a Catapult C/C++ based methodology that integrates key technologies for high-level VLSI modelling of 3G/4G wireless systems to enable extensive time/area tradeoff study. A Catapult C/C++ based ...
  • Rapid Industrial Prototyping and SoC Design of 3G/4G Wireless Systems Using an HLS Methodology 

    Guo, Yuanbin; McCain, Dennis; Cavallaro, Joseph R.; Takach, Andres (2006-07-01)
    Many very-high-complexity signal processing algorithms are required in future wireless systems, giving tremendous challenges to real-time implementations. In this paper, we present our industrial rapid prototyping experiences ...
  • A Rapid Prototyping Environment for Wireless Communication Embedded Systems 

    Jones, Bryan A.; Cavallaro, Joseph R. (2003-05-01)
    This paper introduces a rapid prototyping methodology which overcomes important barriers in the design and implementation of digital signal processing (DSP) algorithms and systems on embedded hardware platforms, such as ...
  • Rapid Prototyping of Wireless Communications Systems 

    Jones, Bryan Allen (2002-05-20)
    This thesis introduces rapid prototyping methodology which overcomes important barriers in the design and implementation of digital signal processing (DSP) algorithms and systems on embedded hardware platforms, such as ...
  • Rapid Scheduling of Efficient FPGA Architectures for Next-Generation HSDPA Wireless System Using Precision C Synthesizer 

    Guo, Yuanbin; McCain, Dennis; Xu, Gang; Cavallaro, Joseph R. (2003-06-20)
    In this paper, an efficient design flow integrating Mentor Graphics Precesion C and HDL designer is derived. In this hybrid prototyping environment, efficient FPGA architec-tures are scheduled rapidly with specific hardware ...