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Discovering regularities in biosequences: Challenges and applications

Journal of Computational Methods in Sciences and engineering 2006年第3期5卷 189-199页

作者： Makris, C.H. Perdikuri, K. Tsakalidis, A. Computer Engineering and Informatics Department University of Patras 26500 Patras Greece Research Academic Computer Technology Institute 61 Riga Feraiou Street 26221 Patras Greece

Computational methods on molecular sequence data are at the heart of computational molecular biology. Identification of known or unknown DNA and RNA motifs or regions involved in various biological processes such as initiation of transcription, gene expression and translation, or the discovery of various types of repeats are some of the applications of major concern. An accurate identification and localization of such elements will allow biologists to perform deeper studies of the structure, function and evolution of genomes. This requires the development of faster and more complex mathematical models and computer algorithms. In this work we discuss current techniques to cope with string problems in molecular sequence data. We focus on Weighted Sequences and Sequences with “don't care characters”, explaining the open problems and their relevance to biological applications.

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Resubmissions and Partly Defined Requests in an Adaptive Admission Control Algorithm for Bandwidth Brokers

Resubmissions and Partly Defined Requests in an Adaptive Adm...

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International Conference on Systems and International Conference on Mobile Communications and Learning Technologies, (ICN/ICONS/MCL) International Conference on Networking

作者： Ch. Bouras K. Stamos Computer Engineering and Informatics Department University of Patras Patras Greece Research Academic Computer Technology Institute Patras Greece

The purpose of this paper is to examine the issues related to the efficiency and adaptability of the admission control module of a Bandwidth Broker. The proposed architecture is able to handle situations such as the resubmission of previously rejected requests and offer a fair treatment for requests in an environment where a subset of these requests do not specify their ending time. We describe the proposed mechanisms for such cases which aim at solving the additional problems of fairly prioritizing resubmitted requests and efficiently handle requests which do not specify ending times. We also provide experimental evaluations of the proposed algorithms and the conclusions they lead us to.

关键词： Programmable control Adaptive control Admission control Bandwidth computer architecture Diffserv networks Routing Quality of service Resource management informatics

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Modeling and Simulation of Submicron MOSFETs with Alternative Gate Dielectrics for DraM Cells

Modeling and Simulation of Submicron MOSFETs with Alternativ...

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International Conference on Microelectronics, MIEL

作者： N. Konofaos G.Ph. Alexiou Computer Engineering & Informatics Department University of Patras Patras Greece Research Academic Computer Technology Institute Patras Greece

In this study, we designed and simulated MOS devices having alternative gate dielectrics and examined their electrical behaviour as well as their effectiveness on the performance of a DraM cell containing them. The devices under test had gate dielectrics of SrTiO 3 , (Ba 1-x Sr x )TiO 3 , TiO 2 , Ta 2 O 5 , Y 2 O 3 and (Pb 1 La x )TiO 3 . Equivalent oxide thicknesses were derived between 0.95 and 4 nm. Among the candidate materials, SrTiO 3 was the most promising when data retention is required, while Y 2 O 3 depicted the best I-V behavior. An increased cell capacitance resulted to higher memory refreshing times, improving substantially the device reliability

关键词： MOSFETs random access memory High-K gate dielectrics Leakage current Circuit testing Dielectric materials High K dielectric materials MOS devices Dielectric devices Inorganic materials

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Pathfinding architectures for interdomain Bandwidth Broker operation

Pathfinding architectures for interdomain Bandwidth Broker o...

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IEEE International Conference on Networks

作者： Christos Bouras Dimitris Primpas Department of Computer Engineering and Informatics University of Patras Patras Greece Research Academic Computer Technology Institute Patras Greece

ISBN: (纸本)0780397460

This paper deals with bandwidth brokers and their inter-domain operation. The basic issues for inter-domain operation are discussed and we try to approach the most demanding issues as the selection of the best inter domain routing path (pathfinding). Generally, we discuss two models for inter domain routing through bandwidth broker, analyzing their advantages and comparing them. Also, we simulated the second one (generalized distributed pathfinding) trying to evaluate its performance. Finally, we discuss the simulation's results and present how this model should be incorporated in normal operation routing of commercial ISPs or academic networks that works on a federated way

关键词： Bandwidth Quality of service Routing Admission control Diffserv networks computer architecture informatics Spine Communication system control Network topology

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Relaxing Delayed Reservations: An approach for Quality of Service differentiation in Optical Burst Switching networks

Relaxing Delayed Reservations: An approach for Quality of Se...

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International Conference on Broadband Networks (BroadNets)

作者： Kostas Christodoulopoulos Kyriakos Vlachos Kostas Yiannopoulos Emmanuel A. Varvarigos Computer Engineering and Informatics Department (CEID) and Research Academic Computer Technology Institute (RACTI) University of Patras Rio Greece

In this paper we present a signaling protocol for QoS differentiation suitable for optical burst switching networks. The proposed protocol is a two-way reservation scheme that employs delayed and in-advance reservation of resources. In this scheme delayed reservations may be relaxed, introducing a reservation duration parameter that is negotiated during call setup phase. This feature allows bursts to reserve resources beyond their actual size to increase their successful forwarding probability and is used to provide QoS differentiation. The proposed signaling protocol offers a low blocking probability for bursts that can tolerate the round-trip delay required for the reservations. We present the main features of the protocol and describe in detail timing considerations regarding the call setup and the reservation process. We also describe several methods for choosing the protocol parameters so as to optimize performance and present corresponding evaluation results. Furthermore, we compare the performance of the proposed protocol against that of two other typical reservation protocols, a Tell-and-Wait and a Tell-and-Go protocol.

关键词： Quality of service Optical burst switching Protocols Delay Optical buffering Optical fiber networks High speed optical techniques Optical wavelength conversion Switching circuits computer networks

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High performance novel hybrid DCA algorithms for efficient channel allocation in cellular communications modeled and evaluated through a Java simulation system

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WSEAS Transactions on Communications 2006年第11期5卷 2078-2085页

作者： Papazoglou, P.M. Karras, D.A. Papademetriou, R.C. Department of Informatics and Computer Technology Lamia Institute of Technology Lamia Greece University of Portsmouth Portsmouth United Kingdom Department of Automation Engineering Chalkis Institute of Technology Chalkis Greece Department of Electronic and Computer Engineering University of Portsmouth Portsmouth United Kingdom

The limited bandwidth and the user demand for advanced mobile services led to the research of new strategies for efficient channel assignment. The role of a channel assignment scheme is to allocate channels to cells or mobiles in such a way as to minimize the probability that the incoming calls are blocked and the probability that ongoing calls are dropped. Advanced services require significant part of the available bandwidth and so efficient bandwidth management through efficient channel assignment must be applied. Channel assignment strategies can be designed and evaluated using a simulation environment specialized in cellular communications. This paper thoroughly reviews distributed DCA schemes and presents several novel efficient variations (e.g. hybrid variation) suitable for large scale cellular systems. In this paper, a comprehensive simulation system for evaluating channel assignment schemes in a detailed level is also presented.

关键词： Cellular radio systems

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Making items suggestions in non online environments

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WSEAS Transactions on computers 2006年第3期5卷 639-644页

作者： Kouris, Ioannis N. Makris, Christos H. Tsakalidis, Athanasios K. Department of Computer Engineering and Informatics School of Engineering University of Patras 26500 Patras Greece Computer Technology Institute P.O. Box 1192 26110 Patras Greece

Practically all data mining techniques and especially association rules assume an on-line environment in order to operate;such as a web site or an electronic machine. Most businesses though as well as the largest part of current trade are still being made in the traditional off-line way, requiring the physical presence of both the customers and the products, leaving all similar applications unassisted from data mining techniques. In this work we describe a system for delivering items suggestions to customers, tailored for the application that for many initiated data mining research;namely supermarket data.

关键词： Online systems

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Scheduling Independent Tasks in Heterogeneous Environments under Communication Constraints

Scheduling Independent Tasks in Heterogeneous Environments u...

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IEEE International Conference on Parallel and Distributed Computing, Applications and Technologies (PDCAT)

作者： Petros Lampsas Thanasis Loukopoulos Fedon Dimopoulos Marouso Athanasiou Department of Informatics and Computer Technology Technological Educational Institute of Lamia Lamia Greece Department of Computer and Communications Engineering University of Thessally Volos Greece

With the advent of the grid, task scheduling in heterogeneous environments becomes more and more important. Of particular interest is the fact that especially in scientific experiments a non negligible amount of data must be transferred to the processing node before a task can commence execution. Given bandwidth constraints, scheduling both computations and data transfers is required. In this paper we first develop a suitable model that captures heterogeneity in the processing nodes while imposing communication constraints. We proceed by proposing scheduling heuristics with the aim of minimizing the total make span of a set of independent tasks. Through a series of experiments we illustrate the potential of a particular heuristic that is based on backfilling

关键词： Processor scheduling Grid computing Educational technology Bandwidth Concurrent computing Distributed computing informatics Delay effects Delay lines Communication networks

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An Embedded Support Vector Machine

An Embedded Support Vector Machine

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Workshop on Intelligent Solutions in Embedded Systems

作者： rasmus Pedersen Martin Schoeberl Department of Informatics CBS Copenhagen Denmark Institute of Computer Engineering University of Technology Vienna Vienna Austria

In this paper we work on the balance between hardware and software implementation of a machine learning algorithm, which belongs to the area of statistical learning theory. We use system-on-chip technology to demonstrate the potential usefulness of moving the critical sections of an algorithm into HW: the so-called hardware/software balance. Our experiments show that the approach can achieve speedups using a complex machine learning algorithm called a support vector machine. The experiments are conducted on a real-time Java virtual machine named Java optimized processor

关键词： Support vector machines Support vector machine classification Machine learning algorithms Kernel Java Hardware Statistical learning Machine learning Embedded system Constraint optimization

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Terahertz Semiconductor Quantum Well Devices

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Journal of Semiconductors 2006年第4期27卷 627-634页

作者： Liu H C Luo H Ban D Waichter M Song C Y Wasilewski Z R Buchanan M Aers G C SpringThorpe A J Cao J C Feng S L Williams B S Hu Q Institute for Microstructural Sciences National Research Council Ottawa K1A 0R6 Canada State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology Chinese AcademyofSciences Shanghai 200050 China Department of Electrical Engineering and Computer Science and Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge Massachusetts 02139 USA

For eventually providing terahertz science with compact and convenient devices,terahertz (1～10THz) quantum-well photodetectors and quantum-cascade lasers are *** design and projected detector performance are presented together with experimental results for several test devices,all working at photon energies below and around optical *** limited infrared performance (BLIP) operations are observed for all samples (three in total),designed for different *** temperatures of 17,13,and 12K are achieved for peak detection frequencies of 9.7THz(31μm),5.4THz(56μm),and 3.2THz(93μm),respectively.A set of THz quantum-cascade lasers with identical device parameters except for doping concentration is *** δ-doping density for each period varies from 3.2×1010 to 4.8×*** observe that the lasing threshold current density increases monotonically with doping ***,the measurements for devices with different cavity lengths provide evidence that the free carrier absorption causes the waveguide loss also to increase *** the observed maximum lasing temperature is best at a doping density of 3.6×1010cm-2.

关键词：半导体量子论激光技术光电探测器

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