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International Conference on Advanced Information Networking and Applications (AINA)

作者： Chun Pong Lau Kamran Jamshaid Basem Shihada Computer Electrical and Mathematical Science and Engineering Division King Abdullah University of Science and Technology Thuwal Saudi Arabia

ISBN: (纸本)9781467355506

In this paper we consider a wireless multimedia system by mapping scalable video coded (SVC) bit stream upon superposition coded (SPC) signals, referred to as (SVC-SPC) architecture. Empirical experiments using a software-defined radio(SDR) emulator are conducted to gain a better understanding of its efficiency, specifically, the impact of the received signal due to different power allocation ratios. Our experimental results show that to maintain high video quality, the power allocated to the base layer should be approximately four times higher than the power allocated to the enhancement layer.

关键词： Resource management Receivers PSNR Video recording Quality assessment Attenuation Modulation

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Improving the Throughput of Cognitive Radio Networks Using the Broadcast Approach

Improving the Throughput of Cognitive Radio Networks Using t...

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IEEE Global Communications Conference

作者： Lokman Sboui Zouheir Rezki Mohamed-Slim Alouini Computer Electrical and Mathematical Sciences and Engineering (CEMSE) Division King Abdullah University of Science and Technology (KAUST)

ISBN: (纸本)9781479913510

We study the impact of adopting a multi layer coding (MLC) strategy, i.e., the so-called broadcast approach (BA) on the throughput of Cognitive Radio (CR) spectrum sharing systems for general fading channels. First, we consider a scenario where the secondary transmitter, a part from the statistics, has no channel state information (CSI) of the cross link and its own link. We show that using BA improves the cognitive achievable rate compared to the outage rate provided by a single layer coding (SLC). In addition, we, also, observe numerically that 2-Layer coding achieves most of the gain. Then, we consider a situation where the secondary transmitter has a partial CSI about its own link through quantized CSI. Again, we compute the secondary achievable rate adopting the BA and highlight the improvement over SLC. Numerical results show that the advantage of MLC decreases as the rate of the feedback link increases.

关键词： Underlay cognitive radio Achievable rate Broadcast approach Quantized CSI Fading channels Cognitive radio Fading channels Throughput Cross-linked outage rate barium microprocessor logic circuit MLC1 gene CCL21 gene STANFORD LINEAR COLLIDER DETECTOR multilayers coding Radio networks

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Spin-Orbit Torques in Co/Pd Multilayer Nanowires

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Physical Review Letters 2013年第24期111卷 246602-246602页

作者： Mahdi Jamali Kulothungasagaran Narayanapillai Xuepeng Qiu Li Ming Loong Aurelien Manchon Hyunsoo Yang Department of Electrical and Computer Engineering and NUSNNI National University of Singapore 117576 Singapore Singapore Division of Physical Science and Engineering King Abdullah University of Science and Technology (KAUST) Thuwal 23955 Saudi Arabia

Current induced spin-orbit torques have been studied in ferromagnetic nanowires made of 20 nm thick Co/Pd multilayers with perpendicular magnetic anisotropy. Using Hall voltage and lock-in measurements, it is found that upon injection of an electric current both in-plane (Slonczewski-like) and perpendicular (fieldlike) torques build up in the nanowire. The torque efficiencies are found to be as large as 1.17 and 5 kOe at 108 A/cm2 for the in-plane and perpendicular components, respectively, which is surprisingly comparable to previous studies in ultrathin (∼1 nm) magnetic bilayers. We show that this result cannot be explained solely by spin Hall effect induced torque at the outer interfaces, indicating a probable contribution of the bulk of the Co/Pd multilayer.

关键词： Torque

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Fibonacci-Based Hardware Post-Processing for Non-Autonomous Signum Hyperchaotic System

Fibonacci-Based Hardware Post-Processing for Non-Autonomous ...

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International Conference on IT Convergence and Security (ICITCS)

作者： Abhinav S. Mansingka Mohamed L. Barakat M. Affan Zidan Ahmed G. Radwan Khaled N. Salama Electrical Engineering Program King Abdullah University of Science and Technology Thuwal KSA Applied Engineering Mathematics Cairo University Egypt

This paper presents a hardware implementation of a robust non-autonomous hyperchaotic-based PRNG driven by a 256-bit LFSR. The original chaotic output is post-processed using a novel technique based on the Fibonacci series, bitwise XOR, rotation, and feedback. The proposed post-processing technique preserves the throughput of the system and enhances the randomness in the output which is verified by successfully passing all NIST SP. 800-22 tests. The system is realized on a Xilinx Virtex 4 FPGA achieving throughput up to 13.165 Gbits/s for 16-bit bus-width surpassing previously reported CB-PRNGs.

关键词： Generators Hardware Throughput NIST Field programmable gate arrays Chaotic communication

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Efficient incremental relaying

Efficient incremental relaying

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IEEE International Symposium on Information Theory

作者： Muhammad Mehboob Fareed Mohamed-Slim Alouini Computer Electrical and Mathematical Science and Engineering Division King Abdullah University of Science and Technology Thuwal Makkah Saudi Arabia

ISBN: (数字)9781479904464

ISBN: (纸本)9781479904440

We propose a novel relaying scheme which improves the spectral efficiency of cooperative diversity systems by utilizing limited feedback from destination. Our scheme capitalizes on the fact that relaying is only required when direct transmission suffers deep fading. We calculate the packet error rate for the proposed efficient incremental relaying scheme with both amplify and forward and decode and forward relaying. Numerical results are also presented to verify their analytical counterparts.

关键词： Relays Fading Signal to noise ratio Diversity reception Error analysis Performance analysis Approximation methods

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Conformal and Green Electronics: A Wideband Inkjet Printed Antenna on Paper Substrate

Conformal and Green Electronics: A Wideband Inkjet Printed A...

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European Conference on Antennas and Propagation

作者： Hattan F. Abutarboush Atif Shamim Electrical Engineering Program Computer Electrical and Mathematical Sciences and Engineering King Abdullah University Of Science and Technology (KAUST) P.O. BOX 4700 Thuwal Saudi Arabia

ISBN: (纸本)9781467321877

A cost effective and environmentally friendly wideband monopole antenna fabricated on flexible paper substrate using a metallic nanoparticle ink is proposed in this paper. By cutting a slot on the main radiator and adding an additional radiator, the bandwidth of the antenna is enhanced. The fabricated antenna prototype has a measured impedance bandwidth of 16.97% for the first band (2.21 - 2.62 GHZ) and 73.68% for the second band, covering the frequency range between 3 - 6.5 GHz. The size of the radiator is 30 × 34 mm~2. The measured and simulated results are in good agreement. The proposed design is suitable for conformal and environmentally friendly "green" electronics.

关键词： Inkjet Paper Substrate Antenna on Paper Wideband Antenna Low cost antenna conformal Radiators broadband antennas Electronics broadband Microstrip antennas ANTENNA antennae Monopole antennas frequency ranges green

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Multiscale Modeling of Blood Flow: Coupling Finite Elements with Smoothed Dissipative Particle Dynamics

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Procedia computer science 2013年 18卷 2565-2574页

作者： Nicolas Moreno Philippe Vignal Jun Li Victor M. Calo Environmental Science and Engineering King Abdullah University of Science and Technology Thuwal 23955-6900 Kingdom of Saudi Arabia Material Science and Engineering King Abdullah University of Science and Technology Thuwal 23955-6900 Kingdom of Saudi Arabia Applied Mathematics and Computer Science King Abdullah University of Science and Technology Thuwal 23955-6900 Kingdom of Saudi Arabia Center of Numerical Porous Media and Department of Earth Science and Engineering King Abdullah University of Science and Technology Thuwal 23955-6900 Kingdom of Saudi Arabia

A variational multi scale approach to model blood flow through arteries is proposed. A finite element discretization to represent the coarse scales (macro size), is coupled to smoothed dissipative particle dynamics that captures the fine scale features (micro scale). Blood is assumed to be incompressible, and flow is described through the Navier Stokes equation. The proposed cou- pling is tested with two benchmark problems, in fully coupled systems. Further refinements of the model can be incorporated in order to explicitly include blood constituents and non-Newtonian behavior. The suggested algorithm can be used with any particle-based method able to solve the Navier-Stokes equation.

关键词： Blood flow Variational Multiscale Smoothed dissipative particle dynamics.

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Decay property for solutions in the three-phase-lag heat conduction

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Communications in Mathematical Analysis 2013年第1期15卷 99-114页

作者： Djouamai, Leila Said-Houariy, Belkacem Applied Math Laboratory University Badji Mokhtar-Annaba Annaba 23000 P.O. Box 12 Algeria Division of Mathematical and Computer Sciences and Engineering King Abdullah University of Science and Technology (KAUST) Thuwal Saudi Arabia

In this paper, we consider the Cauchy problem of two models of the theory of heat conduction with three-phase-lag. Under appropriate assumptions on the material parameters, we show the optimal decay rate of the L²-norm of solutions. More precisely, we prove that in each model the L²-norm of the solution is decaying with the rate (1 + t)^-1/4 for initial data in L¹(R). This decay rate is similar to the one of the heat kernel. Some faster decay rates have been also given for some weighted initial data in L¹(R). © 2013 Project Euclid.

关键词： Decay rate Energy method Heat conduction Stability Three-phase-lag

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Integrated Passive and Wireless Sensor for Magnetic Fields, Temperature and Humidity

Integrated Passive and Wireless Sensor for Magnetic Fields, ...

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IEEE Sensors

作者： Bodong Li Omar Yassine Jurgen Kosel Computer Electrical and Mathematical Sciences and Engineering Division King Abdullah University of Science and Technology Thuwal Saudi Arabia

ISBN: (纸本)9781467346412

This paper presents a surface acoustic wave-based passive and wireless sensor that can measure magnetic field, temperature and humidity. A thin film giant magnetoimpedance sensor, a thermally sensitive LiNbO_3 substrate and a humidity sensitive hydrogel are integrated together with a surface acoustic wave transducer to realize the multifunctional sensor. The device is characterized using a network analyzer under sequentially changing humidity, temperature and magnetic field conditions. The first hand results show the sensor response to all three sensing parameters with small temperature interference on the magnetic signals.

关键词： moistening Network analysers magnetic field sensor response magnetic signals Sensors wireless Temperature fields Temperature Vital Signs multifunctional sensor Integrate

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Optimization of Decision Rule Complexity for Decision Tables with Many-Valued Decisions

Optimization of Decision Rule Complexity for Decision Tables...

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IEEE International Conference on Systems, Man and Cybernetics

作者： Mohammad Azad Igor Chikalov Mikhail Moshkov Computer Electrical & Mathematical Sciences & Engineering Division King Abdullah University of Science and Technology Thuwal Saudi Arabia

We describe new heuristics to construct decision rules for decision tables with many-valued decisions from the point of view of length and coverage which are enough good. We use statistical test to find leaders among the heuristics. After that, we compare our results with optimal result obtained by dynamic programming algorithms. The average percentage of relative difference between length (coverage) of constructed and optimal rules is at most 6.89% (15.89%, respectively) for leaders which seems to be a promising result.

关键词： Heuristic algorithms Clustering algorithms Machine learning algorithms Optimization Dynamic programming Greedy algorithms Flyback transformers

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