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International Conference on Ultrafast Phenomena, UP 2004

作者： Ryzhii, V. Khmyrova, I. Ryzhii, M. Satou, A. Otsuji, T. Shur, M.S. Computer Solid State Physics Laboratory University of Aizu Aizu-Wakamatsu965-8580 Japan Department of Control Engineering and Science Kyushu Institute of Technology Iizuka820-8502 Japan Department of Electrical Computer and Systems Engineering Rcnssclaer Polytechnic Institute Troy12180 United States

We report on the proposal and modeling of a heterostructure device similar to a field-effect transistor using optical excitation of electron plasma oscillations and intended for generation of terahertz signals. ©... 详细信息

ISBN: (纸本)3540241108

关键词： Field effect transistors

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Arches: an infrastructure for PSE development

Arches: an infrastructure for PSE development

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International Workshop on High-Level parallel Programming Models and Supportive Environments

作者： N. DeBardeleben W.B. Ligon R. Sass Parallel Architecture Research Laboratory Holcombe Department of Electrical & Computer Engineering Clemson University Clemson SC USA

In this paper, we describe Arches, an object-oriented framework for building domain-specific PSEs. The framework was designed to support a wide range of problem domains and to be extendable in a way that allows it to target very different high-performance computing models. To demonstrate this flexibility we describe two PSEs that have been developed from the same framework yet solve different problems and target very different computing platforms. The Coven PSE supports parallel applications that need the large-scale parallelism that is found in cost-effective Beowulf clusters. In contrast, the RCADE PSE targets reconfigurable computing (FPGA-based) platforms with fine-grain parallelism. RCADE was designed to aid NASA Earth scientists interested in studying satellite instrument data and who are unlikely to be schooled in low-level hardware design.

关键词： parallel processing Buildings Object oriented modeling Large-scale systems Concurrent computing NASA Earth Satellites Instruments Educational institutions

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The case for mobile OLAP

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) 2004年 3268卷 405-414页

作者： Maniatis, Andreas S. National Technical University of Athens Department of Electrical and Computer Engineering Knowledge and Database Systems Laboratory Greece

On-Line Analytical Processing (OLAP) is a trend in database technology, based on the multidimensional view of data. Numerous applications and development environments exist, offering OLAP analysis to developers, analysts and end users. Further more, mobile devices find their way into almost all aspects of every day life, ranging from cellular phones with advanced capabilities (smart phones) for personal use to professional PDA's used for numerous wireless applications - OLAP included - and thus generating the need for convergence of the two technologies. In this paper we introduce the term Mobile OLAP to express the porting of requirements and specifications for OLAP applications into the wireless and mobile computing world. More specifically, we examine the requirements posed for OLAP visualization applications on mobile devices, both in terms of presentation and usability. We then proceed by investigating the state of the art of the broader wireless computing community, focusing in the specifications more close to OLAP. Finally, we demonstrate how a "lightweight" presentation model for OLAP can significantly contribute towards mobile OLAP. © Springer-Verlag 2004.

关键词： Specifications

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Performance guarantees in sensor networks

Performance guarantees in sensor networks

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： S. Venkatesh Y. Shi W.C. Karl Information Systems and Sciences Laboratory Electrical and Computer Engineering Department Boston University USA

The sensor network for monitoring distributed spatial phenomena has emerged as an area of significant practical interest. In this paper we investigate fundamental issues in detection of spatially distributed phenomena under communication constraints. The novelty of the paper is in providing a tradeoff between global performance and costs involved in communication. In particular we focus our attention on boundary estimation and develop a framework to optimize communication costs subject to worst-case misclassification guarantees. It is shown that the communication cost is primarily a function of two parameters: (1) length of the boundary; (2) overall misclassification error - which leads us to the conclusion that wireless sensor network performance is comparable to that obtained with a wired network of sensors.

关键词： Intelligent networks Wireless sensor networks Testing Sensor phenomena and characterization Cost function Power system control Uncertainty Information systems Laboratories computer networks

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S-band high power solid-state amplifier design and development

S-band high power solid-state amplifier design and developme...

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作者： Stratakos, Yorgos Betzios, Panayotis National Technical University Athens Greece Microwaves/Fiber Optics Laboratory Inst. of Commun./Computer Systems NTUA Greece Department of Electrical Engineering Natl. Technical University of Athens Greece

The design and development of a 230 W power amplifier operating at S-band (2,35 to 2.45 GHz) is described. The motivation behind this development is the need for a microwave driver amplifier to be used in the linear accelerator facility at the Institute of Accelerating systems and Applications at the University of Athens. It will replace the magnetron currently being used at low microwave power. The need for extremely stable microwave power for the electron beam pre-acceleration and chopping cavities makes it imperative to use a solid-state high power GaAs amplifier. The design technology uses microstrips, fabricated on RO4003 substrates, and special care has been taken to protect the amplifier from over temperature and overload. The amplifier is composed of three stages. The first is a MMIC and the other two use GaAs MESFETs. The amplifier also has forward and reflected signal indicators that can be used for remote amplifier control to shut it down if the VSWR is too high, for example, or to check the RF output level and provide automatic gain control. The amplifier was designed using a CAD program, which gave the flexibility to use robust optimizer tools for the complete design of the RF chain. Finally, test results are presented that show excellent agreement with the theoretical predictions.

关键词： Solid state devices

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Level set methods for dynamic tomography

Level set methods for dynamic tomography

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IEEE International Symposium on Biomedical Imaging

作者： Yonggang Shi W.C. Karl Information Systems and Sciences Laboratory Electrical and Computer Engineering Department Boston University USA

ISBN: (纸本)0780383885

In this paper, we propose a novel variational framework for the reconstruction of dynamic objects from sparse and noisy tomographic data. Using an object-based scene model, we developed a general object dynamic model based on a one to one and differentiable mapping. We then propose a novel distance between curves to incorporate the object dynamics into the variational framework. For the minimization of the energy function, we developed a coordinate descent algorithm based on the level set methods. Experimental results for reconstructing a sequence of multiple dynamic objects are presented.

关键词： Level set Tomography Image reconstruction Layout Biological system modeling Image sequences Nuclear medicine Inverse problems Pixel Information systems

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First step toward Internet based embedded control system

First step toward Internet based embedded control system

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Asian Control Conference

作者： E. Suwartadi C. Gunawan A. Setijadi C. Machbub Laboratory for Control and Computer Systems Department of Electrical Engineering Bandung Institute of Technology Indonesia

IP network has been evolving significantly in last decade. Many computers and devices have been attached to the IP network and many applications were taken place over it. One of interesting applications is building embedded control system which has connectivity to Internet. This paper explains an implementation of embedded web server with security support which becomes an example of control application over IP network. A security algorithm, TEA (tiny encryption algorithm), has been implemented in a microprocessor system together with TCP/IP stack. The microprocessor system is based on 8051 family microcontroller which serves as web server. The encryption algorithm is processed both on server and client. Therefore in clients need a plug in, which run encryption mechanism, so that they can access the embedded Web server safely.

关键词： Internet Control systems IP networks Application software Web server Cryptography Microprocessors computer networks TCPIP Microcontrollers

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Differentiable minimin shape distance for incorporating topological priors in biomedical imaging

Differentiable minimin shape distance for incorporating topo...

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IEEE International Symposium on Biomedical Imaging

作者： Yonggang Shi W.C. Karl Information Systems and Sciences Laboratory Electrical and Computer Engineering Department Boston University USA

ISBN: (纸本)0780383885

In the application of curve evolution and level set methods to biomedical image analysis, the incorporation of geometric priors for isolated shapes has been proved useful. On the other hand, the inclusion of a priori topological information concerning the relationship of multiple shapes remains a challenge. In this paper, we propose a differentiable minimin shape distance (DMSD) that is indicative of the topological relation between shapes. A curve evolution equation based on its first variation is derived and this enables us to incorporate this prior into a curve evolution framework. We demonstrate the application of the DMSD by proposing an extension to the Chan-Vese image segmentation model to incorporate topological prior information for challenging image segmentation tasks.

关键词： Biomedical imaging Shape measurement Level set Image segmentation Biomedical measurements Biomedical computing Image analysis Topology Information systems Laboratories

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Music2Share - Copyright-compliant music sharing in P2P systems

Music2Share - Copyright-compliant music sharing in P2P syste...

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作者： Kalker, Ton Epema, Dick H. J. Hartel, Pieter H. Lagendijk, R.L. Van Steen, Maarten Philips Research Eindhoven Eindhoven 5656 AA Netherlands Technical University Eindhoven Eindhoven 5612 AZ Netherlands Parallel and Distributed Systems Group Faculty of Electrical Engineering Mathematics and Computer Science Delft University of Technology Delft 2600 GA Netherlands Distributed and Embedded Systems Group Department of Computer Science University of Twente Enschede 7500 AE Netherlands Delft University of Technology Delft 2628 CD Netherlands Department of Computer Science Vrije Universiteit Amsterdam 1081 HV Netherlands

Peer-to-peer (P2P) networks are generally considered to be free havens for pirated content, in particular with respect to music. We describe a solution for the problem of copyright infringement in P2P networks for music sharing. In particular, we propose a P2P protocol that integrates the functions of identification, tracking, and sharing of music with those of licensing, monitoring, and payment. This highly decentralized music-aware P2P protocol will allow access to large amounts of music of guaranteed quality;it merges in a natural way the policing functions for copyright protection·and an efficient music-management infrastructure for the benefit of the user. © 2004 IEEE.

关键词： Copyrights

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A component-based programming model for autonomic applications

A component-based programming model for autonomic applicatio...

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International Conference on Autonomic Computing (ICAC)

作者： Hua Liu M. Parashar S. Hariri The Applied Software Systems Laboratory Department of Electrical and Computer Engineering Rutgers University Piscataway NJ USA Department of Electrical and Computer Engineering University of Arizona Tucson AZ USA

The emergence of pervasive wide-area distributed computing environments, such as pervasive information systems and computational grids, has enabled new generations of applications that are based on seamless access, aggregation and interaction. However, the inherent complexity, heterogeneity and dynamism of these systems require a change in how the applications are developed and managed. In this paper we present a component-based programming framework to support the development of autonomic self-managed applications. The framework enables the development of autonomic components and the formulation of autonomic applications as the dynamic composition and management of autonomic components. The operation of the proposed framework is illustrated using a forest fire application.

关键词： Grid computing Distributed computing Pervasive computing Crisis management Application software Management information systems Mesh generation Disaster management Programming profession Fires

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