Now showing items 1020-1039 of 2176

    • Laser spectroscopic trace chemical sensors for environmental sensor networks and portable medical devices 

      So, Stephen G. (2008)
      This thesis represents the development of the first laser spectroscopy based trace-gas sensors with sensor characteristics which simultaneously satisfy low cost, handheld footprint, low power, and long term autonomous ...
    • Laser-assisted metalorganic chemical vapor deposition of zinc selenide 

      Shinn, Gregory B. (1992)
      Laser-assisted metalorganic chemical vapor deposition (LMOCVD) has been used to grow epitaxial zinc selenide at temperatures as low as 200$\sp\circ$C. The metalorganic sources, dimethylzinc (DMZ) and diethylselenide (DESe), ...
    • Laser-assisted metalorganic chemical vapor deposition of zinc sulfide 

      Stokes, Scott Wilson (1997)
      Laser-assisted metalorganic chemical vapor deposition (MOCVD) was used to grow crystalline zinc sulfide at temperatures as low as 200$\sp\circ$C. The metalorganic sources, dimethylzinc and diethylsulfide, were photodissociated ...
    • A Lateral Flow Assay for Quantitative Detection of Amplified HIV-1 RNA 

      Rohrman, Brittany A.; Leautaud, Veronica; Molyneux, Elizabeth; Richards-Kortum, Rebecca R. (9/21/2012)
      Although the accessibility of HIV treatment in developing nations has increased dramatically over the past decade, viral load testing to monitor the response of patients receiving therapy is often unavailable. Existing ...
    • Lattice Algorithms for Compression Color Space Estimation in JPEG Images 

      Neelamani, Ramesh; de Queiroz, Ricardo; Baraniuk, Richard G. (2001-08-01)
      JPEG (Joint Photographic Experts Group) is an international standard to compress and store digital color images [5]. Given a color image that was previously JPEG-compressed in some hidden color space, we aim to estimate ...
    • Layered Dynamic Fault Detection and Tolerance for Robots 

      Visinsky, Monica L.; Walker, Ian D.; Cavallaro, Joseph R. (1993-05-01)
      Fault tolerance is increasingly important for space and hazardous environment robotics. Robots need to quickly detect and tolerate internal failures in order to continue performing their tasks without the need for immediate ...
    • LDPC Code Design for Half-Duplex Decode-and-Forward Relaying 

      Chakrabarti, Arnab; de Baynast, Alexandre; Sabharwal, Ashutosh; Aazhang, Behnaam (2005-09-01)
      We propose LDPC code designs for the half-duplex relay channel. Our designs mimic the information theoretic random coding scheme for decode-and-forward relaying. An important advantage of our scheme is that it is built ...
    • LDPC Code Design for OFDM Channel: Graph Connectivity and Information Bits Positioning 

      de Baynast, Alexandre; Sabharwal, Ashutosh; Aazhang, Behnaam (2005-07-01)
      We present an optimized channel coding scheme for OFDM transmission. In the future wireless standards such IEEE 802.11n, frame error rates (FER) as low as 0.0001 are targeting. Irregular LDPC codes have excellent performance ...
    • LDPC Code Design for Relay Channel in Time-Division mode 

      de Baynast, Alexandre; Chakrabarti, Arnab; Sabharwal, Ashutosh; Aazhang, Behnaam (2006-06-01)
      We address the problem of LDPC code design for relay channel in time-division mode based on a distributed strategy: In the first time slot, the source transmits part of the codeword. The relay and the destination receive ...
    • LDPC Code-Design for the Relay Channel 

      Chakrabarti, Arnab; de Baynast, Alexandre; Sabharwal, Ashutosh; Aazhang, Behnaam (2006-02-01)
      We propose LDPC code designs for the half-duplex relay channel. Our designs are derived from the information theoretic random coding scheme for decode-and-forward relaying. An important advantage of our scheme is that it ...
    • LDPC Code-Design for the Relay Channel 

      Chakrabarti, Arnab; de Baynast, Alexandre; Sabharwal, Ashutosh; Aazhang, Behnaam (2006-06-01)
      We propose LDPC code designs for the half-duplex relay channel. Our designs are derived from the information theoretic random coding scheme for decode-and-forward relaying. An important advantage of our scheme is that it ...
    • Learning minimum volume sets with support vector machines 

      Davenport, Mark A.; Baraniuk, Richard G.; Scott, Clayton D. (2006-09-01)
      Given a probability law P on d-dimensional Euclidean space, the minimum volume set (MV-set) with mass beta , 0 < beta < 1, is the set with smallest volume enclosing a probability mass of at least beta. We examine the use ...
    • Least square digital filter design in the frequency domain 

      Soewito, Atmadji Wiseso (1991)
      This thesis develops new methods for obtaining optimal frequency domain approximation in the design of digital filters. The approach uses a squared error approximation criterion and allows a transition band in the desired ...
    • Leveraging synthetic biology for tissue engineering applications 

      Lee, Esther J.; Tabor, Jeffrey J.; Mikos, Antonios G. (2014)
      Restoration of damaged tissues and organs requires precise control of cellular processes at the molecular level. Synthetic biology offers genetic tools that can be used to program the molecular biology of the cell, thereby ...
    • Lifting Construction of Non-Linear Wavelet Transforms 

      Claypoole, Roger L.; Baraniuk, Richard G.; Nowak, Robert David (1998-10-01)
      This paper analyzes non-linear wavelet transforms using the lifting construction. The lifting construction exploits a spatial-domain, prediction-error interpretation of the wavelet transform and provides a powerful framework ...
    • Lightweight Silicon-based Security: Concept, Implementations, and Protocols 

      Majzoobi, Mehrdad (2013-09-16)
      Advancement in cryptography over the past few decades has enabled a spectrum of security mechanisms and protocols for many applications. Despite the algorithmic security of classic cryptography, there are limitations in ...
    • A Limitation of the Kernel Method for Joint Distributions of Arbitrary Variables 

      Baraniuk, Richard G. (1996-02-01)
      Recently, Cohen has proposed a construction for joint distributions of arbitrary physical quantities, in direct generalization of joint time-frequency representations. Actually this method encompasses two approaches, one ...
    • Limited Memory Block Krylov Subspace Optimization for Computing Dominant Singular Value Decompositions 

      Liu, Xin; Wen, Zaiwen; Zhang, Yin (2013)
      In many data-intensive applications, the use of principal component analysis and other related techniques is ubiquitous for dimension reduction, data mining, or other transformational purposes. Such transformations often ...
    • The Limiting Density of a Nonlinear System 

      Papantoni-Kazakos, P.; Kazakos, D. (1974-10-20)
      The RC filter-hard limiter-RC filter nonlinear system shown in Fig. 1 is the subject of this paper. Because of computational difficulties implicated in the analysis of the above system, only its response to the zero mean ...
    • Limits and Capabilities of Cooperative Diversity: A Network and Protocol Perspective 

      Bejarano Chavez, Oscar (2011)
      Physical-layer cooperation has been demonstrated to vastly improve wireless link reliability and end-to-end throughput by exploiting spatial diversity. Nevertheless, its performance in operational networking environments ...