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Optimization of data transfer for grid using GridFTP

Journal of Computing and Information Technology 2007年第4期15卷 347-353页

作者： Radic, Branimir Kajic, Vedran Imamagic, Emir University Computing Centre University of Zagreb J. Marohnića 5 Zagreb10000 Croatia Department of Electronics Microelectronics Computer and Intelligent Systems Faculty of Electrical Engineering and Computing University of Zagreb Croatia

Grid is a highly distributed heterogeneous environment which interoperates towards completing a common goal. As such, grids performance is highly dependant on the speed of data transfer between systems of which grid consists. Most commonly used and a "de facto" standard for data transfer on grid systems is GridFTP [7]. While working on CRO-GRID Infrastructure [3] project, we faced problems with small data transfer speeds when transferring small files. In this paper we present a program we have developed which uses GridFTP and speeds up data transfer of large number of small or medium sized files. We also present empirical results of the performance measurements achieved while using the implemented system.

关键词： Data transfer

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Optimization of low-delay wavelet video codecs

Optimization of low-delay wavelet video codecs

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26th Picture Coding Symposium, PCS 2007

作者： PopLawski, Andrzej Domański, Marek Uniwersity of Zielona Góra Institute of Computer Engineering and Electronics Poland Poznań University of Technology Department of Multimedia Telecommunications and Microelectronics Poland

ISBN: (纸本)9789898109057

The paper deals with lifting implementations of the motion-compensated temporal filter banks in the (t+2D) wavelet codecs. The paper is focused on the problem of optimum setup of the analysis and synthesis filters with the maximum coding efficiency possible for a given delay constrain. Systematic exhaustive experiments have been performed in order to find optimum setup as well as coding efficiency for a given delay constrain.

关键词： Motion compensation

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Visualization service based on web services

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Journal of Computing and Information Technology 2007年第4期15卷 339-345页

作者： Blazona, Bojan Mihajlovic, Zeljka Ericsson Nikola Tesla Krapinska 45 Zagreb10 000 Croatia University of Zagreb Faculty of Electrical Engineering Computing Department of Electronics Microelectronics Computer and Intelligent Systems Unska 3 Zagreb10 000 Croatia

Scientific visualization evolved up to the stage where collaborative work in virtual coexistence of various experts has become unavoidable in identifying and solving specific visualization tasks. These problems encouraged us to research and define key aspects of visualization service which will enable collaborative work over the Internet. In this paper we define architecture of the whole system and unified interface for all requirements in such environment. Unified requests are sent to visualization processing unit to execute required visualization routine. Collaborative work on the volumetric medical data is a specially demanding task, so we present development of VMI (Visualization of Medical data over the Internet) system, where segmentation for visualization is based on joint histogram.

关键词： Visualization

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Control allocation with actuator dynamics for aircraft flight controls

Control allocation with actuator dynamics for aircraft fligh...

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7th AIAA Aviation Technology, Integration, and Operations Conference

作者： Ahmad, Hammad Young, Trevor M. Toal, Daniel Omerdic, Edin Department of Mechanical and Aeronautical Engineering University of Limerick Ireland Department of Electronics and Computer Engineering University of Limerick Ireland M and AE Dept. University of Limerick AIAA ECE Dept. University of Limerick

ISBN: (纸本)1563479087

This paper addresses the control allocation to several aircraft flight controls to produce required body axis angular accelerations. Control law is designed to produce the virtual control effort signals, which are then distributed by solving a sequential least squares problem using active set method to the flight control surfaces to generate this effort. Two cases are described: in the first case the control law and allocation for the healthy aircraft is implemented, and in the second case, jamming of one control surface is introduced at time zero. In this case, it was shown how the controller and allocation compensate for this failure without changing the control law. To implement this system it was assumed that there is a good fault identification system onboard. Normally aircraft are over-actuated and in the case of a control failure this over actuation is more pronounced due to coupling of aircraft dynamics. Instead of using one-to-one mapping between control allocator and control surfaces, actuator dynamics was included in the system. The discrepancy in the optimal signal from control allocation due to this additional dynamics was compensated using the scheme mentioned in this paper. Each gain corresponding to the actuator is tuned using genetic algorithms (GA). The controller and allocation design are implemented on a nonlinear B747 model with actuator dynamics.

关键词： Flight control systems

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Collaborative learning in laboratory-oriented courses using web conferencing for shared control of physical laboratory experiments

Collaborative learning in laboratory-oriented courses using ...

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114th Annual ASEE Conference and Exposition, 2007

作者： Das, Trishna Imbertson, Paul Mohan, Ned University of Minnesota ECE United States University of Minnesota United States Electrical and Computer Engineering Department University of Minnesota United States Department of Power Electronics Systems University of Minnesota Minneapolis United States IEEE

The Electrical and computer engineering department at the University of Minnesota has embarked on an innovative method to conduct the laboratory component for its Electric Drives course. The method involves exploiting the versatility of the Adobe Breeze 5.1 package, which can create a computer interface for users to actively participate from remote computers in ongoing experiments. Apart from the instructor being able to demonstrate the experiment to students, she can also actively involve the students by giving them remote control of the experiment. So the experiment can be performed in a collaborative manner by giving control to each group of students or individual students with all students having viewing privileges. The students can get a real-time experience using this new method. The cost of laboratory setups can be greatly reduced using this method. The method allows a large number of students to perform experiments using just one physical laboratory setup. Hence the university can reduce its investments on laboratory apparatuses and invest on the software, which is much more cost effective. © American Society for engineering Education, 2007.

关键词： Curricula

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MLP/BP-Based Soft Decision Feedback Equalization with Bit-Interleaved TCM for Wireless Applications

MLP/BP-Based Soft Decision Feedback Equalization with Bit-In...

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作者： Hsu, Terng-Ren Lin, Chien-Ching Hsu, Terng-Yin Lee, Chen-Yi Department of Electronics Engineering National Chiao Tung University 1001 University Road Hsinchu 300 Taiwan Department of MicroElectronics Engineering Chung Hua University 707 WuFu Road Hsinchu 300 Taiwan Department of Computer Science and Information Engineering National Chiao Tung University 1001 University Road Hsinchu 300 Taiwan

For more efficient data transmissions, a new MLP/BP-based channel equalizer is proposed to compensate for multi-path fading in wireless applications. In this work, for better system performance, we apply the soft output and the soft feedback structure as well as the soft decision channel decoding. Moreover, to improve packet error rate (PER) and bit error rate (BER), we search for the optimal scaling factor of the transfer function in the output layer of the MLP/BP neural networks and add small random disturbances to the training data. As compared with the conventional MLP/BP-based DFEs and the soft output MLP/BP-based DFEs, the proposed MLP/BP-based soft DFEs under multi-path fading channels can improve over 3-0.6 dB at PER=10-1and over 3.3-0.8 dB at BER=10-3. Copyright © 2007 The Institute of electronics, Information and Communication Engineers.

关键词： Decision feedback equalizers

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Power Harvesting With PZT Ceramics

Power Harvesting With PZT Ceramics

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： Hong Chen Chen Jia Chun Zhang Zhihua Wang Chunsheng Liu Institute of Microelectronics Tsinghua University Beijing China Department Computer & Electronics Engineering University of Nebraska Lincoln Omaha NE USA

Piezoelectric materials have been proposed as embedded power source, which are capable of converting mechanical energy into electrical energy. However, power generated from a piezoelectric material usually comes with poor characteristics such as high voltage, low current and high impedance. In order to drive the embedded sensor circuit, piezoelectric power needs to be characterized and regulated. In this paper, the authors present an analysis on the power generation characteristics of the stiff lead zirconate titanate (PZT) ceramics and its equivalent circuit. It is then verified by simulation and experimental results. Since a single PZT element may not meet the needs of real-world embedded applications, we present experiments and analysis using four identical PZTs. Finally, the authors outline an application where PZT elements are used for power generation in a total knee replacement (TKR) implant.

关键词： Ceramics Power generation Piezoelectric materials Mechanical energy Character generation Low voltage Impedance Mechanical sensors Sensor phenomena and characterization Circuits

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Neural network based CAD models for analysis and design of fin-lines for mm-wave applications

Neural network based CAD models for analysis and design of f...

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IEEE Applied Electromagnetics Conference (AEMC)

作者： Chandrakant Pandit A. Patnaik S. N. Sinha Electronics & Computer Engineering Department Indian Institute of Technology Roorkee Roorkee India ECE Department M.N. National Institute of Technology Allahabad India

ISBN: (纸本)9781424418633;9781424418640

Neural network (NN) based CAD models have been developed for analysis and design of fin-lines. In the analysis phase, the network takes the dimensional parameters of the finline structure as its input and gives the characteristic impedance (Z 0 ) and normalized guided wavelength (b/lambda cf ) as its output. Another network, trained for design, takes Z 0 along with other dimensions as input and produces the normalized gap width between fins (w/b) as output. A multilayer perceptron trained in the back-propagation mode is used to develop the networks. Results for unilateral fin-line is presented in this paper.

关键词： Artificial neural networks Training Impedance Design automation Solid modeling Computational modeling Dielectric constant

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Visualization Service Based on Web Services

Visualization Service Based on Web Services

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International Conference on Information Technology Interfaces

作者： Bojan Blazona Zeljka Mihajlovic Ericsson Nikola Tesla d.d. Zagreb Croatia Faculty of Electrical Engineering and Computing Department of Electronics Microelectronics Computer and Intelligent Systems University of Zagreb Zagreb Croatia

ISBN: (纸本)9537138097

Scientific visualization evolved up to the stage where collaborative work in virtual coexistence of various experts becomes unavoidable to identify and solve specific visualization tasks. These problems encouraged us to research and define key aspects of visualization service which will enable collaborative work over the Internet. In this paper we define architecture of the whole system and unified interface for all requirements in such environment. Unified requests are sent to visualization processing unit to execute required visualization routine. Collaborative work on the volumetric medical data is especially demanding task, so we present development of VMI (Visualization of Medical data over Internet) system, where segmentation for visualization is based on joint histogram.

关键词： Web services Data visualization Collaborative work Web and internet services Simple object access protocol IP networks Data security Humans XML microelectronics

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CD-MAC: Cooperative Diversity MAC for Robust Communication in Wireless Ad Hoc Networks

CD-MAC: Cooperative Diversity MAC for Robust Communication i...

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IEEE International Conference on Communications (ICC)

作者： S. Moh C. Yu S.-M. Park H.-N. Kim J. Park School of Computer Engineering Chosun University Gwangju South Korea Department ECE Cleveland State University Cleveland OH USA Electronics and Telecommunications Research Institute Daejeon South Korea

This paper proposes a medium access control (MAC) algorithm, called Cooperative Diversity MAC (CD-MAC), which exploits the cooperative communication capability to improve robustness in wireless ad hoc networks . In CD-MAC, each terminal proactively selects a relay for cooperation and lets it transmit simultaneously when it is beneficial in mitigating interference from nearby terminals and thus improving the network performance. For practicability, CD-MAC is designed based on the widely adopted IEEE 802.11 MAC. System-level simulation study shows that CD-MAC significantly outperforms the original IEEE 802.11 MAC in terms of packet delivery ratio.

关键词： Robustness Mobile ad hoc networks Relays Media Access Protocol Interference Fading Physical layer Bit error rate Communications Society Cultural differences

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