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Field‐Effect Transistors: Heterogeneous Nucleation Promotes Carrier Transport in Solution‐Processed Organic Field‐Effect Transistors (Adv. Funct. Mater. 3/2013)

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Advanced Functional Materials 2013年第3期23卷

作者： Ruipeng Li Hadayat Ullah Khan Marcia M. Payne Detlef‐M. Smilgies John E. Anthony Aram Amassian Materials Science and Engineering Program Division of Physical Science and Engineering King Abdullah University of Science and Technology Thuwal 23955‐6900 Saudi Arabia Department of Chemistry University of Kentucky Lexington KY 40506 USA Cornell High Energy Synchrotron Source Cornell University Ithaca NY 14850 USA

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Nanobiocomposite-based Bienzyme Screen-printed Electrode For Glucose Monitoring

Nanobiocomposite-based Bienzyme Screen-printed Electrode For...

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International Conference on Management, Manufacturing and Materials engineering (ICMMM 2011)

作者： Pakapongpan, Saithip Thachepan, Surachai Poo-arporn, Yingyot Palangsuntikul, Rungtiva Nanoelectronics and MEMs Laboratory National Electronics and Computer Technology Center (NECTEC) Thailand Department of Chemistry Faculty of Science Kasetsart University Thailand Synchrotron Light Research Institute Thailand Biological Engineering Program King Mongkut's University of Technology Thonburi Thailand

ISBN: (纸本)9783037853511

Multi-walled carbon nanotubes (MWNTs) were coated first with methylene blue (MB) by noncovalent adsorption and then by horseradish peroxidase (HRP) and glucose oxidase (GOD) by covalent-linking. The MB-MWNTs/GOD/HRP composites formed stable films on screen-printed electrodes (SPE). The electrochemical and electrocatalytic behaviors of the bienzyme modified SPE were studied using cyclic voltammetry (CV) and amperometry. Using the MB-MWNT/GOD/HRP composites, glucose could be calibrated by amperometry at -0.35 V vs. SCE. The optimized response (at pH 7.0) had a sensitivity of 2.4 mA.M-1 and a limit of detection (3xS/N) of 35 mu M. Tests of the portable bienzyme sensor demonstrate its imperviousness to the effects of ascorbic acid, uric acid and p-acetaminophen, as well as its ability to measure glucose concentrations ranging from 0.25 to 2 mM.

关键词： Bienzyme Composite Carbon nanotubes Methylene blue HRP GOD

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Thermal modeling and analysis of storage systems

Thermal modeling and analysis of storage systems

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2012 IEEE 31st International Performance Computing and Communications Conference, IPCCC 2012

作者： Jiang, Xunfei Alghamdi, Mohammed I. Zhang, Ji Assaf, Maen Al Ruan, Xiaojun Muzaffar, Tausif Qin, Xiao Department of Computer Science and Software Engineering Auburn University Auburn AL 36849-5347 United States Department of Computer Science Al-Baha University Al-Baha City Saudi Arabia King Abdullah II School for Information Technology University of Jordan Amman Jordan Department of Computer Science West Chester University of Pennsylvania West Chester PA 19383 United States

ISBN: (纸本)9781467348812

Recognizing that power and cooling cost for data centers are increasing, we address in this study the thermal impact of storage systems. In the first phase of this work, we generate the thermal profile of a storage server containing three hard disks. The profiling results show that disks have comparable thermal impacts as processing and networking elements to overall storage node temperature. We develop a thermal model to estimate the outlet temperature of a storage server based on processor and disk utilizations. The thermal model is validated against data acquired by an infrared thermometer as well as build-in temperature sensors on disks. Next, we apply the thermal model to investigate the thermal impact of workload management on storage systems. Our study suggests that disk-aware thermal management techniques have significant impacts on reducing cooling cost of storage systems. We further show that this work can be extended to analysis the cooling cost of data centers with massive storage capacity. © 2012 IEEE.

关键词： Cost benefit analysis

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Explicit solution of the time domain magnetic field integral equation using a predictor-corrector scheme

Explicit solution of the time domain magnetic field integral...

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International Conference on Electromagnetics in Advanced Applications (ICEAA)

作者： H. A. Ülkü H. Bağci E. Michielssen Division of Physical Science and Engineering King Abdullah University for Science and Technology Thuwal Saudi Arabia Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI USA

An explicit yet stable marching-on-in-time (MOT) scheme for solving the time domain magnetic field integral equation (TD-MFIE) is presented. The stability of the explicit scheme is achieved via (i) accurate evaluation of the MOT matrix elements using closed form expressions and (ii) a PE(CE) m type linear multistep method for time marching. Numerical results demonstrate the accuracy and stability of the proposed explicit MOT-TD-MFIE solver.

关键词： Integral equations Time domain analysis Magnetic fields Numerical stability Stability analysis Transient analysis Accuracy

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Adaptive graph regularized Nonnegative Matrix Factorization via feature selection

Adaptive graph regularized Nonnegative Matrix Factorization ...

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International Conference on Pattern Recognition

作者： Jing-Yan Wang Islam Almasri Xin Gao Mathematical and Computer Sciences and Engineering Division King Abdullah University for Science and Technology Thuwal Saudi Arabia

ISBN: (纸本)9781467322164

Nonnegative Matrix Factorization (NMF), a popular compact data representation method, fails to discover the intrinsic geometrical structure of the data space. Graph regularized NMF (GrNMF) is proposed to avoid this limitation by regularizing NMF with a nearest neighbor graph constructed from the input data feature space. However using the original feature space directly is not appropriate because of the noisy and irrelevant features. In this paper, we propose a novel data representation algorithm by integrating feature selection and graph regularization for NMF. Instead of using a fixed graph as GrNMF, we regularize NMF with an adaptive graph constructed according to the feature selection results. A uniform object is built to consider feature selection, NMF and adaptive graph regularization jointly, and a novel algorithm is developed to update the graph, feature weights and factorization parameters iteratively. Data clustering experiment shows the efficacy of the proposed method on the Yale database.

关键词： Vectors Databases Optimization Face Clustering algorithms Linear programming Matrices

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Area green efficiency (AGE) of two tier heterogeneous cellular networks

Area green efficiency (AGE) of two tier heterogeneous cellul...

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IEEE Globecom Workshops

作者： Hina Tabassum Muhammad Zeeshan Shakir Mohamed-Slim Alouini Computer Electrical Mathematical Sciences and Engineering (CEMSE) Division King Abdullah University for Science and Technology Thuwal Makkah Saudi Arabia Department of Electrical and Computer Engineering Texas A and M University Qatar Doha Qatar

Small cell networks are becoming standard part of the future heterogeneous networks. In this paper, we consider a two tier heterogeneous network which promises energy savings by integrating the femto and macro cellular networks and thereby reducing CO 2 emissions, operational and capital expenditures (OPEX and CAPEX) whilst enhancing the area spectral efficiency (ASE) of the network. In this context, we define a performance metric which characterize the aggregate energy savings per unit macrocell area and is referred to as area green efficiency (AGE) of the two tier heterogeneous network where the femto base stations are arranged around the edge of the reference macrocell such that the configuration is referred to as femto-on-edge (FOE). The mobile users in macro and femto cellular networks are transmitting with the adaptive power while maintaining the desired link quality such that the energy aware FOE configuration mandates to save energy, and reduce the co-channel interference. We present a mathematical analysis to incorporate the uplink power control mechanism adopted by the mobile users and calibrate the uplink ASE and AGE of the energy aware FOE configuration. Next, we derive analytical expressions to compute the bounds on the uplink ASE of energy aware FOE configuration and demonstrate that the derived bounds are useful in evaluating the ASE under worst and best case interference scenarios. Simulation results are produced to demonstrate the ASE and AGE improvements in comparison to macro-only and macro-femto configuration with uniformly distributed femtocells.

关键词： Femtocells Macrocell networks Mobile computing Bandwidth Green products Uplink

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Statistical Characterization of Wave Propagation in Mine Environments

Statistical Characterization of Wave Propagation in Mine Env...

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IEEE International Symposium on Antennas and Propagation

作者： Onur Bakir Abdulkadir C. Yucel Eric Michielssen Hakan Bagci Dept. of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI USA Division of Physical Sciences and Engineering King Abdullah University of Science and Technology Thuwal KSA

ISBN: (纸本)9781467304610

A computational framework for statistically characterizing electromagnetic (EM) wave propagation through mine tunnels and galleries is presented. The framework combines a multi-element probabilistic collocation (ME-PC) method with a novel domain-decomposition (DD) integral equation-based EM simulator to obtain statistics of electric fields due to wireless transmitters in realistic mine environments.

关键词： Propagation Receivers Uncertainty Approximation methods Transmitters Standards Polynomials

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Heterogeneous LTE/802.11a mobile relays for data rate enhancement and energy-efficiency in high speed trains

Heterogeneous LTE/802.11a mobile relays for data rate enhanc...

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IEEE Globecom Workshops

作者： Rachad Atat Elias Yaacoub Mohamed-Slim Alouini Adnan Abu-Dayya Electrical Engineering Program King Abdullah University for Science and Technology Thuwal Makkah Saudi Arabia Qatar Mobility Innovations Center (QMIC) Doha Qatar

Performance enhancements of cellular networks for passengers in high speed railway systems are investigated. Relays placed on top of each train car are proposed. These relays communicate with the cellular base station (BS) over Long Term Evolution (LTE) long range links and with the mobile terminals (MTs) inside the train cars using IEEE 802.11a short range links. Scenarios with unicasting and multicasting from the BS are studied, both in the presence and absence of the relays. In addition, LTE resource allocation is taken into account. The presence of the relays is shown to lead to significant enhancements in the effective data rates of the MTs, in addition to leading to huge savings in the energy consumption from the batteries of the MTs.

关键词： Relays Multicast communication Wireless communication Energy consumption Long Term Evolution Bandwidth Mobile communication

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Multiplicative Algorithms for Constrained Non-negative Matrix Factorization

Multiplicative Algorithms for Constrained Non-negative Matri...

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IEEE International Conference on Data Mining (ICDM)

作者： Chengbin Peng Ka-Chun Wong Alyn Rockwood Xiangliang Zhang Jinling Jiang David Keyes Computer Electrical and Mathematical Sciences & Engineering King Abdullah University of Science and Technology Thuwal Kingdom of Saudi Arabia Department of Computer Science University of Toronto Toronto Canada Department of Computer Science Aalborg University Aalborg Denmark

ISBN: (纸本)9781467346498

Non-negative matrix factorization (NMF) provides the advantage of parts-based data representation through additive only combinations. It has been widely adopted in areas like item recommending, text mining, data clustering, speech denoising, etc. In this paper, we provide an algorithm that allows the factorization to have linear or approximately linear constraints with respect to each factor. We prove that if the constraint function is linear, algorithms within our multiplicative framework will converge. This theory supports a large variety of equality and inequality constraints, and can facilitate application of NMF to a much larger domain. Taking the recommender system as an example, we demonstrate how a specialized weighted and constrained NMF algorithm can be developed to fit exactly for the problem, and the tests justify that our constraints improve the performance for both weighted and unweighted NMF algorithms under several different metrics. In particular, on the Movie lens data with 94% of items, the Constrained NMF improves recall rate 3% compared to SVD50 and 45% compared to SVD150, which were reported as the best two in the top-N metric.

关键词： Vectors Measurement Approximation algorithms Clustering algorithms Motion pictures Convergence Matrix decomposition

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Spin diffusion in bulk GaN measured with MnAs spin injector

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Physical Review B 2012年第3期86卷 035315-035315页

作者： Shafat Jahangir Fatih Doğan Hyun Kum Aurelien Manchon Pallab Bhattacharya Center for Photonics and Multiscale Nanomaterials Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor Michigan 48109-2122 USA Division of Physical Science and Engineering King Abdullah University of Science and Technology Thuwal 23955 Saudi Arabia

Spin injection and precession in bulk wurtzite n-GaN with different doping densities are demonstrated with a ferromagnetic MnAs contact using the three-terminal Hanle measurement technique. Theoretical analysis using minimum fitting parameters indicates that the spin accumulation is primarily in the n-GaN channel rather than at the ferromagnet (FM)/semiconductor (SC) interface states. Spin relaxation in GaN is interpreted in terms of the D’yakonov-Perel mechanism, yielding a maximum spin lifetime of 44 ps and a spin diffusion length of 175 nm at room temperature. Our results indicate that epitaxial ferromagnetic MnAs is a suitable high-temperature spin injector for GaN.

关键词： NUCLEAR spin DIFFUSION GALLIUM nitride ARSENIDES SPINTRONICS FERROMAGNETISM SEMICONDUCTORS

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