Now showing items 21-40 of 480

    • Finding a simple path with multiple must-include nodes 

      Vardhan, Hars; Billenahalli, Shreejith, 1982-; Huang, Wanjun, 1978-; Razo, Miguel; Sivasankaran, Arularasi; Tang, Limin, 1977-; Monti, Paolo, 1973-; Tacca, Marco, 1973-; Fumagalli, Andrea (The University of Texas at Dallas, 2013-05-23)
      This document presents an algorithm to find a simple path in the given network with multiple must-include nodes. The problem of finding a simple path with only one must-include node can be solved in polynomial time using ...
    • An analytical model with improved accuracy of IEEE 802.11 protocol under unsaturated conditions 

      Vijayasankar, Kumaran, 1984-; Taufique, Azar; Kannan, Lakshmi Narasimhan, 1984-; Tacca, Marco, 1973-; Fumagalli, Andrea (The University of Texas at Dallas, 2013-05-23)
      In this work the authors present an analytical model that - compared to previously published work- more accurately captures the delay of IEEE 802.11 protocol under low, medium, and near-saturation load conditions. A Markov ...
    • Building alternate multitasking trees in MPLS networks 

      Tang, Limin, 1977-; Billenhalli, Shreejith; Vardhan, Hars; Tacca, Marco, 1973-; Fumagalli, Andrea; Monti, Paolo, 1973- (The University of Texas at Dallas, 2013-05-23)
      An algorithm for computing alternate multicast trees in packet transport networks is proposed in this paper. The algorithm efficiently computes multiple sub-optimal tree candidates for a given multicast service request. ...
    • Wireless multimedia networks: cross-layer access protocols based on sequential opportunistic decoding (SOD) 

      Jegbefume, Onyemelem, 1977-; Saquib, M.; Tacca, Marco, 1973-; Fumagalli, Andrea; Monti, Paolo, 1973- (The University of Texas at Dallas, 2013-05-23)
      Spread spectrum (SS) solutions offer well understood advantages to wireless networking, e.g., robustness to noise and interference, concurrent asynchronous transmissions, effective power and transmission rate control ...
    • Ad Hoc 802.11b cooperative protocols: performance in a slow fading channel 

      Agarwal, Niraj, 1977-; ChanneGowda, Divya, 1981-; Kannan, Lakshmi Narasimhan, 1984-; Tacca, Marco, 1973-; Fumagalli, Andrea (The University of Texas at Dallas, 2013-05-24)
      This paper investigates the use of cooperative communications in the context of ad hoc IEEE 802.11b to combat radio signal degradations due to slow fading. The performance gain of both an existing cooperative protocol and ...
    • Cooperative communications in multihop networking: a case study based on the IEEE 802.11 protocol 

      Kannan, Lakshmi Narasimhan, 1984-; Vijayasankar, Kumaran, 1984-; ChanneGowda, Divya, 1981-; Agarwal, Niraj, 1977-; Fumagalli, Andrea; Tacca, Marco, 1973- (The University of Texas at Dallas, 2013-05-24)
      This paper combines multi-hop networking with single-hop cooperative communications. The solution is built upon the standard IEEE 802.11 protocol operating in the ad hoc mode. A simulation based comparison is carried out ...
    • Optimization of interference alignment beamforming vectors 

      Kim, Douglas E.; Torlak, Murat (The University of Texas at Dallas, 2013-05-24)
      Interference alignment, while optimum in its achievement of the maximum degrees of freedom for the K user interference channel, does so only at high SNR and for large numbers of dimensions over which to align the interference, ...
    • Trading network management complexity for blocking probability when placing optical regenerators 

      Savasini, Marcio S.; Monti, Paolo, 1973-; Fumagalli, Andrea; Tacca, Marco, 1973-; Waldman, Helio (The University of Texas at Dallas, 2013-05-24)
      Optical signal regenerators (3R) are required to overcome the adverse effect of fiber and other transmission impairments. 3R units may be placed either at every node (full placement) or at some selected nodes (sparse ...
    • Reconfigurable optical networks: a cross layer approach 

      Roshani-Tabrizi, Reza, 1976-; Monti, Paolo, 1973-; Tacca, Marco, 1973-; Fumagalli, Andrea (The University of Texas at Dallas, 2013-05-24)
      This paper presents the Pruning with Memory (PWM) algorithm, which computes a cross layer optimal reconfiguration sequence in reconfigurable IP/MPLS over optical networks.
    • Destination-initiated wavelength-weighted reservation protocol in WDM rings 

      Pitchumani, Sudhakar, 1978-; Cerutti, Isabella, 1973-; Fumagalli, Andrea (The University of Texas at Dallas, 2013-06-03)
      In networks that require dynamic assignment of wavelengths, it is known that destination initiated reservation protocols lower the blocking robability - caused by unavailable wavelengths or convergence problems of the ...
    • Surface profile determination of phase shift masks by inverse scatterometry 

      Byrne, Dale M.; Reed, Jeffrey Alan, 1961-; AI Assaad, Rayan M., 1977- (The University of Texas at Dallas, 2013-06-03)
      This report describes research conducted by Research Associate Jeffrey A. Reed and graduate student Rayan AI Assaad under the direction of Dr. Dale M. Byrne, at the University of Texas at Dallas. The period of investigation ...
    • Synthetic Mammalian Transgene Negative Autoregulation 

      Shimoga, Vinay; White, Jacob T.; Li, Yi; Sontag, Eduardo; Bleris, Leonidas (2013-06-04)
      Biological networks contain overrepresented small-scale topologies, typically called motifs. A frequently appearing motif is the transcriptional negative-feedback loop, where a gene product represses its own transcription. ...
    • Using power control to build neighborhoods in ad-hoc networks: shouting! 

      Montgomery, Don; Kulkarni, Sarvesh (The University of Texas at Dallas, 2013-06-04)
      The past few years have seen a tremendous surge of interest in wireless mobile (ad-hoc, or nomadic) networks. In many cases, mobile nodes are powered by batteries, therefore their uptime depends on how efficiently they can ...
    • On the role of reachability and observability in NMR experimentation 

      Ober, Raimund J.; Ramakrishna, Viswanath; Ward, E. Sally (The University of Texas at Dallas, 2013-06-04)
      It is shown that the system theoretic concepts of reachability and observability are relevant in the analysis of NMR experiments. Both one-dimensional and multi-dimensional NMR experiments are considered..
    • Threshold-based blocking differentiation in circuit switched WDM networks 

      Pitchumani, Sudhakar, 1978-; Cerutti, Isabella, 1973-; Fumagalli, Andrea (The University of Texas at Dallas, 2013-06-11)
      This paper introduces a centralized admission control mechanism, referred to as Threshold-based Blocking Differentiation (TBDijf), to differentiate the blocking probability experienced by various service classes in a circuit ...
    • Digital subcarrier optical networks (DSONs) 

      Huang, Wanjun, 1978-; Razo, Miguel; Tacca, Marco, 1973-; Fumagalli, Andrea; Hui, Rongqing (The University of Texas at Dallas, 2013-06-18)
      Energy efficient networks are increasingly becoming a desirable feature in today’s market. Both the number of users and the average amount of data traffic generated by each user continue to grow, requiring more powerful ...
    • Stochastic preplanned restoration algorithms 

      Fumagalli, Andrea; Valcarenghi, Luca, 1972- (The University of Texas at Dallas, 2013-06-18)
      The ability of overcoming service interruptions, i.e., resilience, has always been an irremissible requirement for communication networks. Resilient schemes can either reserve in advance network spare resources (protection ...
    • A queueing model for PCEP (Path Computation Element Protocol) 

      Yu, Juanjuan, 1978-; He, Yue; Wu, Kai; Tacca, Marco, 1973-; Fumagalli, Andrea; Vasseur, Jean-Phillippe (The University of Texas at Dallas, 2013-06-18)
      Path computation elements (PCE’s) are used to compute end-to-end paths across multiple areas. Multiple PCE’s may be dedicated to each area to provide sufficient path computation capacity and redundancy. An open problem is ...
    • Single-source single-relay cooperative ARQ protocols in TDM radio networks 

      Cerutti, Isabella, 1973-; Fumagalli, Andrea; Gupta, Puja, 1980- (The University of Texas at Dallas, 2013-06-18)
      In conventional (non-cooperative) automatic repeat request (ARQ) protocols for radio networks, the corrupted data frames that cannot be correctly decoded at the destination are retransmitted by the source. In cooperative ...
    • A scalable wavelength assignment algorithm using minimal number of wavelength converters in resilient WDM networks 

      Razo, Miguel; Billenahalli, Shreejith; Huang, Wanjun, 1978-; Sivasankaran, Arularasi; Tang, Limin, 1977-; Vardhan, Hars; Tacca, Marco, 1973-; Fumagalli, Andrea; Monti, Paolo, 1973- (The University of Texas at Dallas, 2013-06-18)
      Careful wavelength assignment (WA) to support lambda services is necessary to reduce the total number of wavelength converters (WCs), which are required every time the wavelength continuity constraint cannot be met in ...