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International Conference on Management of Emergent Digital Ecosystems, MEDES'11

作者： Mödritscher, Felix Taferner, Wolfgang Soylu, Ahmet De Causmaecker, Patrick Institute for Information Systems and New Media Vienna University of Economics and Business Augasse 2-6 1090 Vienna Austria Department of Computer Science K.U. Leuven Interdisciplinary Research on Technology Education and Communication - IBBT E. Sabbelaan 53 8500 Kortrijk Belgium

ISBN: (纸本)9781450310475

Collaboration in Digital Ecosystems can be very complex due to varying types and numbers of actors and artifacts, and the many possible interactions between these entities. Hereby, network visualizations are useful for analyzing networked collaboration and consequently for supporting cognitive processes, like fostering reflection, enabling awaareness. In this paper, we examine different techniques for visualizing ICTenabled interactions in Digital Ecosystems. After giving a brief overview of related work, we argue for the application of twomode networks for visualizing patterns of networked collaboration and discuss different issues by comparing this technique to traditional visualizations. Copyright © 2011 ACM.

关键词： Visualization

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Scaling in cloud environments

Scaling in cloud environments

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15th WSEAS International Conference on computers, Part of the 15th WSEAS CSCC Multiconference

作者： Bellenger, Dominique Bertram, Jens Budina, Andy Koschel, Arne Pfänder, Benjamin Serowy, Carsten Astrova, Irina Grivas, Stella Gatziu Schaaf, Marc Faculty IV Department of Computer Science University of Applied Sciences and Arts Hannover Ricklinger Stadtweg 120 30459 Hannover Germany In Vision Software OÜ Lõõtsa 2A 11415 Tallinn Estonia Institute for Information Systems University of Applied Sciences Northwestern Switzerland Riggenbachstrasse 16 4600 Olten Switzerland

ISBN: (纸本)9781618040190

This paper describes two approaches to scaling in cloud environments - semi-automatic (also called by request) and automatic (also called on demand) - and explains why the latter is to prefer. Semi-automatic scaling is illustrated with an example of Amazon Elastic Compute Cloud, whereas automatic scaling is illustrated with an example of Amazon Web Services Elastic Beanstalk.

关键词： Web services

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A study of loop style and abstraction in pedagogic practice

Conferences in Research and Practice in Information Technolo...

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Conferences in Research and Practice in Information Technology Series 2011年 114卷 29-36页

作者： Barnes, David J. Shinners-Kennedy, Dermot School of Computing The University of Kent Canterbury Kent. CT2 7NF United Kingdom Department of Computer Science and Information Systems University of Limerick Limerick Ireland

ISBN: (纸本)9781920682941

This paper describes the results of a study into the use of structure and abstraction in the programming styles of lecturers and teaching assistants involved in teaching programming to students attending university and other third-level institutions. The study was motivated by the hypothesis that the trend towards object-orientation is being matched by pedagogic materials that consistently foster the deployment of abstraction and structure in the solution of programming problems. Unfortunately the evidence does not support the hypothesis. We conclude that the persistent use of abstraction at all levels of implementation is necessary to perfect expertise in its application and secure the benefits of the object-oriented paradigm. © 2011, Australian computer Society, Inc.

关键词： Abstracting

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Multi-rate low density generator matrix code for satellite laser communications

Multi-rate low density generator matrix code for satellite l...

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International Conference on Space Optical systems and Applications

作者： Matsuo, Hirotaka Okamoto, Eiji Iwanami, Yasunori Shoji, Yozo Toyoshima, Morio Takayama, Yoshihisa Department of Computer Science and Engineering Graduate School of Engineering Nagoya Institute of Technology Gokiso-cho Syowa-ku Nagoya 466-8555 Japan Space Communication Systems Laboratory Wireless Network Research Institute National Institute of Information and Communications Technology 4-2-1 Nukui-Kitamachi Koganei Tokyo 184-8795 Japan

ISBN: (纸本)9781424496853

We propose a new transmission scheme of multi-rate low density generator matrix (LDGM) code suitable for optical satellite communications. Since the proposed scheme doesn't utilize a preamble transmission of the rate information nor the repeat request scheme, a long feedback delay in the satellite link and a decrease of transmission efficiency can be avoided. Then, an adaptive rate transmission only with forward error correction (FEC) is achieved and the transmitter can choose the quality or the rate-efficiency of transmission from the transmitter-side state. In the receiver, an exact rate-decision and decoding are conducted without the preamble. It is shown that the proposed scheme is effective in the satellite-to-ground optical link by the computer simulations. © 2011 IEEE.

关键词： Iterative decoding

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Introducing support for embedded and real-time devices into existing hierarchical component system: Lessons learned

Introducing support for embedded and real-time devices into ...

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9th ACIS International Conference on Software Engineering Research, Management and Applications, SERA 2011

作者： Pop, Tomáš Keznikl, Jaroslav Hošek, Petr Malohlava, Michal Bures, Tomáš Hnětynka, Petr Charles University Faculty of Mathematics and Physics Department of Distributed and Dependable Systems Malostranske namesti 25 Prague 1 118 00 Czech Republic Institute of Computer Science Academy of Sciences of the Czech Republic Pod Vodarenskou vezi 2 Prague 8 182 07 Czech Republic Imperial College London United Kingdom

ISBN: (纸本)9780769544908

As embedded and real-time systems became an inherent part of many electronic appliances of everyday use, the demand for their development has grown enormously. Increasing complexity of these systems leads to demands of tools and techniques addressing their efficient and short time-to-market development. One of the possible ways to tackle the problem is a reuse of tools, methodologies and know how already established and successfully adopted in other application domains. Such transfer cannot be done inherently without appropriate modification and methodical adaptation based on an analysis of domain requirements. The paper analyzes necessary modifications and extensions of a general purpose component-based technology to enable development of embedded real-time systems. In addition, we present our own experience obtained while tailoring advanced component framework SOFA 2 to support development of embedded and real-time systems. © 2011 IEEE.

关键词： Embedded systems

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Cochlear Implant Speech Processing Using Wavelet Transform

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International Scholarly Research Notices 2012年第1期2012卷

作者： M. Mehrzad M. D. Abolhassani A. H. Jafari J. Alirezaie M. Sangargir Medical Physics & Biomedical Engineering Department Tehran University of Medical Sciences Tehran *** Irantums.ac.ir Biomedical Group Research Centre for Science and Technology in Medicine Tehran 14185615 Iran Department of Electrical and Computer Engineering Ryerson University Toronto ON Canada M5B 2K3ryerson.ca Department of Systems Design Engineering University of Waterloo Waterloo ON Canada N2L 3G1uwaterloo.ca

We present a method for coding speech signals for the simulation of a cochlear implant. The method is based on a wavelet packet decomposition strategy. We used wavelet packet db4 for 7 levels, generated a series of channels with bandwidths exactly the same as nucleus device, and applied an input stimulus to each channel. The processed signal was then reconstructed and compared to the original signal, which preserved the contents to a high percentage. Finally, performance of the wavelet packet decomposition in terms of computational complexity was compared to other commonly used strategies in cochlear implants. The results showed the power of this method in processing of the input signal for implant users with less complexity than other methods, while maintaining the contents of the input signal to a very good extent.

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Cool mega-array: A highly energy efficient reconfigurable accelerator

Cool mega-array: A highly energy efficient reconfigurable ac...

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2011 International Conference on Field-Programmable Technology, FPT 2011

作者： Ozaki, N. Yoshihiro, Y. Saito, Y. Ikebuchi, D. Kimura, M. Amano, H. Nakamura, H. Usami, K. Namiki, M. Kondo, M. Department of Information and Computer Science Keio University 3-14-1 Hiyoshi Yokohama 223-8522 Japan Department of Information Physics and Computing University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-8656 Japan Department of Information Science and Engineering Shibaura Institute of Technology 3-7-5 Toyosu Kohtoh-ku Tokyo 135-8548 Japan Dpartment of Computer and Information Science Tokyo University of Agriculture and Technology 2-24-16 Nakamachi Koganei Tokyo 184-8588 Japan Graduate School of Information Systems Tokyo University of Electro-Communication 1-5-1 Chofugaoka Chofu Tokyo 182-8585 Japan

ISBN: (纸本)9781457717406

A highly energy efficient reconfigurable accelerator called CMA (Cool Mega-Array) is proposed. It consists of a large Processing Element (PE) array without memory elements for maintain result of ALU and configuration data, a small simple programmable micro controller for data management, and the data memory. Unlike traditional coarse grained reconfigurable processors, the power consumption for hardware context switching, storing intermediate data in registers, and clock distribution for them are eliminated from PE array which occupies large area of a chip. Configuration registers are collected to small area of micro controller. The data flow graph mapped on the PE array is static during execution. Various application programs can be implemented by making the best use of flexible data management instructions with the micro controller. When the delay time in the PE array is longer than the data handling time with the micro controller, the supply voltage for the PE array is scaled to reduce the power consumption without degrading the performance. In the opposite case, wave pipelining is applied to enhance PE array performance. A prototype chip CMA-1 with 8 × 8 PE array with 24-bit data width was fabricated in 2.1 × 4.2mm2 65-nm CMOS technology, and achieves 2.4-GOPS/11.2-mW sustained performance. This energy efficiency is comparable to that of the most energy efficient accelerators that have been reported. © 2011 IEEE.

关键词： Electric power utilization

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Shor’s quantum algorithm using electrons in semiconductor nanostructures

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Physical Review A 2011年第1期83卷 012302-012302页

作者： Fabrizio Buscemi []Department of Electronics Computer Science and Systems University of Bologna Viale Risorgimento 2 I-40136 Bologna Italy[]ARCES Alma Mater Studiorum University of Bologna Via Toffano 2/2 I-40125 Bologna Italy and[]Center S3 CNR-Institute of Nanosciences Via Campi 213A I-41125 Modena Italy

Shor’s factoring algorithm illustrates the potential power of quantum computation. Here, we present and numerically investigate a proposal for a compiled version of such an algorithm based on a quantum-wire network by exploiting the potential of fully coherent electron transport assisted by the surface acoustic waves. Specifically, a nonstandard approach is used to implement, in a simple form, the quantum circuits of the modular exponentiation execution for the simplest instance of Shor’s algorithm, that is, the factorization of N=15. The numerical procedure is based on a time-dependent solution of the multiparticle Schrödinger equation. The near-ideal algorithm performance and the large estimated fidelity indicate the efficiency of the protocol implemented, which also is almost insensitive to small destabilizing effects during quantum computation.

关键词： QUANTUM theory QUANTUM computers ALGORITHMS SEMICONDUCTORS NANOSTRUCTURES NANOWIRES ELECTRON transport

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CDRAS: An approach to dealing with Man-in-the-Middle attacks in the context of voice over IP

CDRAS: An approach to dealing with Man-in-the-Middle attacks...

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2011 6th International Conference on Availability, Reliability and Security, ARES 2011

作者： Hofbauer, Stefan Quirchmayr, Gerald Wills, Christopher C. Danube Data Center GmbH Network Department Floridsdorfer Hauptstrasse 1 1210 Vienna Austria University of Vienna Multimedia Information Systems Research Group Liebiggasse 4/3-4 1010 Vienna Austria University of South Australia Division of Information Technology School of Computer and Information Science Mawson Lakes SA 5095 Australia University of South Australia Division of Information Technology School of Computer and Information Science GPO Box 2471 Adelaide SA 5001 Australia Kingston University Faculty of Computing Information Systems and Mathematics Penrhyn Road Surrey KT1 2EE London United Kingdom

ISBN: (纸本)9780769544854

This paper describes the CDRAS (Call Detail Records Analysis System) system, the motivation behind it, its approach and its background. The system aims at dealing with the notorious Man-in-the-Middle attack in the context of VoIP. As the use of such a system constitutes leads to an interference with the privacy of users, the most relevant legal aspects related to this work are also briefly discussed. © 2011 IEEE.

关键词： Voice/data communication systems

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Raman antenna formed by molecule/plasmonic nanostructure hybrid system

Raman antenna formed by molecule/plasmonic nanostructure hyb...

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作者： Chen, Shiuan-Yeh Mock, Jack J. Hill, Ryan T. Chilkoti, Ashutosh Smith, David R. Lazarides, Anne A. Department of Electrical and Computer Engineering Duke University Durham NC 27708 United States Center for Metamaterials and Integrated Plasmonics Duke University Durham NC 27708 United States Center for Biologically Inspired Materials and Material Systems Duke University Durham NC 2 7708 United States Department of Biomedical Engineering Duke University Durham NC 27708 United States Department of Mechanical Engineering and Materials Science Duke University Durham NC 27708 United States

A nano-antenna composed of a particle and a polarizable surface provides control of the spatial distribution and high enhancement of Raman scattering. This structure may serve as a stable platform for single molecule ... 详细信息

ISBN: (纸本)9781557529107

关键词： Nanoantennas

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