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IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP)

作者： Z.Y. Pan P. Zhang B. Ng M.H. Hong Data Storage Institute Agency for Science Technology and Research Singapore Department of Electrical and Computer Engineering National University of Singapore Singapore Experimental Solid State Group Physics Department Imperial College London London UK

Split ring resonator (SRR) structures based terahertz (THz) metamaterials with different gap dimensions are fabricated on polyethylene naphthalate (PEN) films by parallel laser micro-lens array (MLA) lithography and lift-off process. The narrowband resonance is achieved in single layer SRR samples. A series of single layer SRR samples are fabricated with different gap sizes to obtain successive narrowband THz resonances over a wide THz range. For broadband design, these single layer SRR samples are stacked to form a multilayer structure. The multilayer SRR is experimentally demonstrated with a much broader bandwidth of 0.221 THz and enhanced resonance up to 2.14 times as compared to the single layer SRR.

关键词： Metamaterials Magnetic materials Broadband communication Nonhomogeneous media Narrowband Periodic structures Broadband antennas

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An Optimal Packet Aggregation Scheme in Delay-Constrained IEEE 802.11n WLANs

An Optimal Packet Aggregation Scheme in Delay-Constrained IE...

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International Conference on Wireless Communications, Networking and Mobile computing (WiCom)

作者： Peyman Teymoori Aresh Dadlani Khosrow Sohraby Kiseon Kim Department of Nanobio Materials and Electronics Gwangju Institute of Science and Technology Gwangju South Korea School of Electrical and Computer Engineering University of Tehran Tehran Iran School of Computing and Engineering University of Missouri-Kansas City Kansas MO USA

ISBN: (纸本)9781612846842

With the successful deployment of IEEE 802.11a/b/g wireless local area networks (WLANs) and the pent-up market demand for high speed wireless access, the IEEE 802.11n protocol has emerged as a promising standard with major enhancements. In order to scale to the high physical layer transmission rate of up to 600 Mbps, the current medium access control (MAC) protocol requires significant improvements. Towards this end, several packet aggregation schemes have been proposed to reduce the inherent protocol overhead. However, choosing large frame sizes would result in increased channel access delay and jitter especially in delay-critical applications. In this paper, we propose an analytical model to obtain the optimal frame size with regard to the delay constraints of nodes. In particular, we model IEEE 802.11n aggregation scheme as a constrained convex optimization problem so as to maximize network throughput performance while considering delay constraints. Simulation results justify that our proposed model exactly satisfies average delay requirements of network nodes.

关键词： Delay Throughput IEEE 802.11n Standard Wireless communication Analytical models Protocols

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Fabrication of CMOS-compatible nanopillars for smart bio-mimetic CMOS image sensors

Fabrication of CMOS-compatible nanopillars for smart bio-mim...

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Annual IEEE Northeast Workshop on Circuits and Systems (NEWCAS)

作者： Fayçal Saffih Amro M. Elshurafa Mohammad Ali Mohammad Nathaniel Nelson-Fitzpatrick Stephane Evoy Physical Science and Engineering King Abdullah University for Science and Technology Thuwal Saudi Arabia Department of Electrical and Computer Engineering ECERF W2-085 University of Alberta Edmonton AB Canada Institute for Quantum Computing University of Waterloo Waterloo ONT Canada

In this paper, nanopillars with heights of 1μm to 5μm and widths of 250nm to 500nm have been fabricated with a near room temperature etching process. The nanopillars were achieved with a continuous deep reactive ion etching technique and utilizing PMMA (polymethylmethacrylate) and Chromium as masking layers. As opposed to the conventional Bosch process, the usage of the unswitched deep reactive ion etching technique resulted in nanopillars with smooth sidewalls with a measured surface roughness of less than 40nm. Moreover, undercut was nonexistent in the nanopillars. The proposed fabrication method achieves etch rates four times faster when compared to the state-of-the-art, leading to higher throughput and more vertical side walls. The fabrication of the nanopillars was carried out keeping the CMOS process in mind to ultimately obtain a CMOS-compatible process. This work serves as an initial step in the ultimate objective of integrating photo-sensors based on these nanopillars seamlessly along with the controlling transistors to build a complete bio-inspired smart CMOS image sensor on the same wafer.

关键词： Etching Fabrication Silicon Nanobioscience CMOS integrated circuits Biomedical imaging Educational institutions

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Distributing Power Grid State Estimation on HPC Clusters - A System Architecture Prototype

Distributing Power Grid State Estimation on HPC Clusters - A...

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IEEE International Symposium on Parallel and Distributed Processing Workshops and Phd Forum (IPDPSW)

作者： Yan Liu Wei Jiang Shuangshuang Jin Mark Rice Yousu Chen Data Intensive Computing Group Pacific Northwest National Laboratory Richland WA USA Department of Computer Science and Engineering Ohio State University Columbus OH USA Electrical Power Systems Engergy Pacific Northwest National Laboratory Richland WA USA

ISBN: (纸本)9781467309745

The future power grid is expected to further expand with highly distributed energy sources and smart loads. The increased size and complexity lead to increased burden on existing computational resources in energy control centers. Thus the need to perform real-time assessment on such systems entails efficient means to distribute centralized functions such as state estimation in the power system. In this paper, we present our experience of prototyping a system architecture that connects distributed state estimators individually running parallel programs to solve non-linear estimation procedure. Through our experience, we highlight the needs of integrating the distributed state estimation algorithm with efficient partition and data communication tools so that distributed state estimation has low overhead compared to the centralized solution. We build a test case based on the IEEE 118 bus system and partition the state estimation of the whole system model to available HPC clusters. The measurement from the test bed demonstrates the low overhead of our solution.

关键词： State estimation computer architecture Size measurement Distributed databases Power grids Partitioning algorithms

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MapReduce across Distributed Clusters for data-intensive Applications

MapReduce across Distributed Clusters for Data-intensive App...

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IEEE International Symposium on Parallel and Distributed Processing Workshops and Phd Forum (IPDPSW)

作者： Lizhe Wang Jie Tao Holger Marten Achim Streit Samee U. Khan Joanna Kolodziej Dan Chen Center for Earth Observation and Digital Earth Chinese Academy of Sciences China Steinbuch Center for Computing Karlsruhe Institute of Technology Germany Department of Electrical and Computer Engineering North Dakota State University USA Department of Mathematics and Computer Science University of Bielsko-Biała Poland School of Computer China University of Geoscience China

Recently, the computational requirements for large scale data-intensive analysis of scientific data have grown significantly. In High Energy Physics (HEP) for example, the Large Hadron Collider (LHC) produced 13 petabytes of data in 2010. This huge amount of data are processed on more than 140 computing centers distributed across 34 countries. The MapReduce paradigm has emerged as a highly successful programming model for large-scale data-intensive computing applications. However, current MapReduce implementations are developed to operate on single cluster environments and cannot be leveraged for large-scale distributed data processing across multiple clusters. On the other hand, workflow systems are used for distributed data processing across data centers. It has been reported that the workflow paradigm has some limitations for distributed data processing, such as reliability and efficiency. In this paper, we present the design and implementation of GHadoop, a MapReduce framework that aims to enable large-scale distributed computing across multiple clusters. G-Hadoop uses the Gfarm file system as an underlying file system and executes MapReduce tasks across distributed clusters. Experiments of the G-Hadoop framework on distributed clusters show encouraging results.

关键词： Servers Distributed databases data processing Torque Software computer architecture Computational modeling

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Lecture Notes in computer science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics): Preface

Lecture Notes in Computer Science (including subseries Lectu...

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Lecture Notes in computer science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2012年 7490 LNCS卷 V-VII页

作者： Träff, Jesper Larsson Benkner, Siegfried Dongarra, Jack Vienna University of Technology Faculty of Informatics Institute of Information Systems Favoritenstr. 16 1040 Vienna Austria University of Vienna Faculty of Computer Science Research Group Scientific Computing Währinger Str. 29/6.21 1090 Vienna Austria University of Tennessee Department of Electrical Engineering and Computer Science Knoxville TN 37996 United States

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On the Development of Global Plasma-Ionosphere FDTD Algorithms for Electromagnetic Calculations in the Earth- Ionosphere System

On the Development of Global Plasma-Ionosphere FDTD Algorith...

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International Conference on Electromagnetics in Advanced Applications

作者： Yaxin Yu Jamesina J. Simpson Erping Li Institute of High Performance Computing Agency for Science Technology and Research (A*STAR) 1 Fusionopolis Way #16-16 Connexis North Tower Singapore 138632 Electrical and Computer Engineering Department University of New Mexico Albuquerque NM 87106 USA

ISBN: (纸本)9781467303330

This paper reports the development of global FDTD models incorporated with a quasi-real anisotropic ionosphere consisting of magnetized cold plasmas. Compared to the existing global models utilizing simple conductivity ionospheric profiles, the algorithms reported in this paper can sufficiently extend the global-scale electromagnetic simulations to much higher altitudes as the physics introduced by the spatially-varied ionospheric plasmas and the geomagnetic field can be fully included in calculations.

关键词： paper reports global FDTD extend the global-scale

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Handwritten and Machine Printed Text Separation in Document Images Using the Bag of Visual Words Paradigm

Handwritten and Machine Printed Text Separation in Document ...

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International Workshop on Frontiers in Handwriting Recognition

作者： Konstantinos Zagoris Ioannis Pratikakis Apostolos Antonacopoulos Basilis Gatos Nikos Papamarkos Pattern Recognition and Image Analysis (PRImA) Research Laboratory School of Computing Science and Engineering University of Salford Greater Manchester UK Department of Electrical and Computer Engineering Democritus University of Thrace Xanthi Greece Institute of Informatics and Telecommunications National Center for Scientific Research Demokritos Athens Greece

In a number of types of documents, ranging from forms to archive documents and books with annotations, machine printed and handwritten text may be present in the same document image, giving rise to significant issues within a digitisation and recognition pipeline. It is therefore necessary to separate the two types of text before applying different recognition methodologies to each. In this paper, a new approach is proposed which strives towards identifying and separating handwritten from machine printed text using the Bag of Visual Words paradigm (BoVW). Initially, blocks of interest are detected in the document image. For each block, a descriptor is calculated based on the BoVW. The final characterization of the blocks as Handwritten, Machine Printed or Noise is made by a Support Vector Machine classifier. The promising performance of the proposed approach is shown by using a consistent evaluation methodology which couples meaningful measures along with a new dataset.

关键词： Visualization Noise Image segmentation Hidden Markov models Gabor filters Handwriting recognition Text recognition

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An Adaptive and Cost-Effective data Transmission Framework Using MMS Technology for Client-Server Application

International Journal of Interactive Mobile Technologies

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International Journal of Interactive Mobile Technologies 2012年第1期6卷 25-32页

作者： Setyono, A. Alam, M.J. Eswaran, C. Faculty of Information technology Multimedia University Cyberjaya Malaysia Faculty of Computer Science Dian Nuswantoro University Semarang Indonesia Faculty of Information Technology Center for Multimedia Computing Multimedia University Cyberjaya Malaysia Department of electrical engineering Indian Institute of Technology Madras India

Limitation of message size of the MMS technology is one of the important factors which make this technology less attractive. This limitation restricts the system developers in developing new mobile applications using MMS technology. This research attempts to improve the capacity of the maximum message size by implementing compression, splitting and cropping techniques for MMS application on the mobile phone devices. This paper presents the architecture to enhance the multimedia capabilities of the MMS technology and also the implementation details for developing client-server system applications. The modified MMS technology can be used to develop practical client-server applications. © 2012, International Federation of engineering Education Societies (IFEES). All rights reserved.

关键词： Cost effectiveness

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Photonic crystals in proton-exchanged LiNbO3 waveguides for photonic applications

Photonic crystals in proton-exchanged LiNbO3 waveguides for ...

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IEEE PhotonicsGlobal@Singapore, IPGC

作者： Deng Jun Jia Wei Vanga Sudheer Kumar Ching Eng Png Andrew A. Bettiol Aaron J. Danner Institute of High Performance Computing Agency for Science Technology and Research (ASTAR) Singapore Department of Electrical and Computer Engineering National University of Singapore Singapore Henan Key Laboratory of Laser and O pto-electric Information Technology Zhengzhou University Henan China Department of Physics National University of Singapore Singapore

Photonic crystals realized in LiNbO 3 have a great potential to reduce the size and increase the functionality of integrated optical devices. In order to accomplish these aims, fabrication know-how must be mastered yet it remains relatively uncharted. In this work we report the fabrication and optical characterization of photonic crystal structures in annealed proton exchanged (APE) LiNbO 3 waveguides. In our work, channel waveguides were fabricated by photolithography patterning followed by immersing LiNbO 3 wafers in molten benzoic acid at 235°C for 5 h. The thickness and the composition profiles of the APE waveguides were measured using the secondary ion mass spectroscopy (SIMS) method. The experimental characterization of the photonic crystal waveguides was performed and a photonic stop band with good sharpness can be observed from the transmission spectra.

关键词： Photonics Optical fibers Optical device fabrication Optical imaging Optical polarization

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