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IEEE Symposium on computers and Communications (ISCC)

作者： Georgios Drainakis Peristera Baziana Adonis Bogris School of Electrical and Computer Engineering National Technical University of Athens Athens Greece Department of Informatics and Telecommunications University of Thessaly Lamia Greece Department of Informatics and Computer Engineering University of West Attica Egaleo Greece

In this paper we propose a DC network (DCN) architecture that interconnects servers in the intra-rack and inter-rack domain, utilizing optical switching at each domain. The proposed interconnection techniques are studied as an intermediate step before migrating the entire DCN to all-optical schemes. Unlike other studies, we study the server-to-server communication across the whole DCN. For the performance evaluation we produce numerical results for throughput and end-to-end delay for three traffic classes co-existing in DCN s. The numerical analysis reveals that bandwidth utilization reaches 90% and 100% in the intra- and inter- domain respectively. Meanwhile, the maximum end-to-end delay for the highest priority packets under congested load is lower than 0.56 and 0.41 µs for the two examined intra-rack capacity scenarios of 400 and 600 Gbps respectively. A comparative study shows that our solution can effectively interconnect up to 10000 servers with lower environmental footprint and end-to-end delay than other DCN s.

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Multi-Parametric Online RWA Based on Impairment Generating Sources

Multi-Parametric Online RWA Based on Impairment Generating S...

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GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference

作者： P. Kokkinos K. Christodoulopoulos K. Manousakis E. A. Varvarigos Computer Engineering and Informatics Department University of Patras Greece Research Academic Computer Technology Institute Patra Greece

We propose and evaluate an impairment-aware multi-parametric routing and wavelength assignment algorithm for online traffic in transparent optical networks. In such networks the signal quality of transmission degrades due to physical layer impairments. In the multi-parametric approach, a vector of cost parameters is assigned to each link, from which the cost vectors of candidate lightpaths are calculated. In the proposed scheme the cost vector includes impairment generating source parameters, such as the path length, the number of hops, the number of crosstalk sources and other inter-lightpath interfering parameters, so as to indirectly account for the physical layer effects. For a requested connection the algorithm calculates a set of candidate lightpaths, whose quality of transmission is validated using a function that combines the impairment generating parameters. For selecting the lightpath we propose and evaluate various optimization functions that correspond to different IA-RWA algorithms. Our performance results indicate that the proposed algorithms utilize efficiently the available resources and minimize the total accumulated signal degradation on the selected lightpaths, while having low execution times.

关键词： Costs Optical fiber networks Physical layer Degradation Repeaters Optical receivers computer networks Optical computing Wavelength routing Wavelength assignment

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Evaluation of different radio bearer selection approaches for MBMS in B3G networks

Evaluation of different radio bearer selection approaches fo...

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IFIP Wireless Days, WD

作者： Antonios Alexiou Christos Bouras Vasileios Kokkinos Evangelos Rekkas Research Academic Computer Technology Institute Patras Greece and Computer Engineering and Informatics Department University of Patras Greece

The spread of multimedia data has drastically differentiated the current landscape of Universal Mobile Telecommunication System (UMTS) networks, posing the need for further enhancements in its Radio Resource Management (RRM) strategies. Introduced in 3rd Generation Partnership Project (3 GPP) Release 6, the Multimedia Broadcast/Multicast Services (MBMS) framework aims at the efficient usage of network and radio resources for the transmission of multimedia services. The main requirement during the provision of MBMS multicast services is to minimize the transmission power of UMTS base stations. To this direction, several mechanisms have been proposed that either allow a simultaneous deployment of Point-to-Point (PTP) and Point-to-Multipoint (PTM) transmissions, or a single transport channel deployment (PTP or PTM) in a cell at any given time. Main objective of this paper is to study these mechanisms, compare them in terms of power consumption, underline the advantages that they may offer; and finally to propose enhancements that will ensure the lowest possible power consumption during MBMS transmissions.

关键词： 3G mobile communication Power control Energy consumption computer networks Telecommunication computing Digital multimedia broadcasting Base stations Data engineering informatics Multimedia systems

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Memory-Less Pipeline Dynamic Circuit Design Technique

Memory-Less Pipeline Dynamic Circuit Design Technique

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IEEE computer Society Annual Symposium on VLSI

作者： Themistoklis Haniotakis Zaher Owda Yiorgos Tsiatouhas Department of Computer Engineering and Informatics University of Patras Patras Greece Department of Computer Science University of Ioannina (UoI) Ioannina Greece

ISBN: (纸本)9781424473212

A desirable characteristic of VLSI circuits is high speed operation. The use of dynamic circuit design techniques can provide high speed operation at lower silicon area requirements, compared to full static CMOS designs. Another common design technique in order to achieve high operating speed is the use of pipeline schemes. However, the higher the required operating frequency, the higher the number of stages we must implement in the pipeline. In addition, a limiting factor in cases with a large number of stages, are the restrictions imposed from the required memory elements. These memory elements not only increase the silicon area of the implementation but also restrict the maximum achievable frequency due to their internal delays. In this paper, we propose a memory-less pipeline design style, where the combinational part is implemented with dynamic circuits that offer the desirable high speed operation while the memory elements are eliminated due to an intelligent clocking scheme. Thus, the proposed design technique provides the advantage of high performance operation and at the same time compares favorably to preexisting approaches with respect to silicon overhead and power requirements.

关键词： Logic gates Clocks Pipelines Transistors CMOS integrated circuits MOS devices Logic design

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Low power test set embedding based on phase shifters

Low power test set embedding based on phase shifters

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IEEE computer Society Annual Symposium on VLSI

作者： M. Bellos D. Kagaris D. Nikolos Computer Engineering & Informatics Department University of Patras Greece Computer Technology Institute Patras Greece Electrical & Computer Engineering Department Southem Illinois University Carbondale IL USA

A new efficient method for test set embedding based on phase shifters was recently proposed This method suffers from high average and peak power consumption. In this work we propose a new phase shifter-based test set embedding method, which, by using interleaving and two LFSRs that change state in a non-overlapping way, significantly reduces the average and peak power consumption.

关键词： Phase shifters Circuit testing Energy consumption Built-in self-test Circuit faults Embedded computing Power engineering computing Automatic testing Integrated circuit testing Power engineering and energy

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AL-FEC for streaming services over LTE systems

AL-FEC for streaming services over LTE systems

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International Symposium on Wireless Personal Multimedia Communications (WPMC)

作者： Christos Bouras Nikolaos Kanakis Vasileios Kokkinos Andreas Papazois Computer Engineering and Informatics Department University of Patras Greece Computer Technology Institute and Press Diophantus Patras Greece

The Third Generation Partnership Project (3GPP), recently introduced the evolution of the third generation (3G) cellular networks, the Long Term Evolution (LTE) telecommunication system. A key aspect of LTE specifications is the enhancement of Multimedia Broadcast/Multicast Services (MBMS), where the same content is transmitted to multiple users located in a specific service area. A significant point of the demanding multimedia services is the enhancement of the robustness against packet losses. To this direction, in order to support the efficient point-to-multipoint download and streaming delivery, 3GPP has included an Application Layer Forward Error Correction (AL-FEC) scheme in the MBMS standard. The standardized AL-FEC scheme is based on the systematic, fountain Raptor codes. In this paper, we investigate the application of AL-FEC over the MBMS streaming delivery method. We consider the benefits of AL-FEC for a seamless multimedia streaming transmission to multiple mobile users and we examine how the amount of FEC overhead can be adjusted under different packet loss conditions. For this purpose, we present a variety of realistic simulation scenarios for the performance evaluation of FEC considering several network and FEC encoding parameters. Furthermore, we provide suggestions in order to achieve efficient use of Raptor codes over LTE MBMS streaming services.

关键词： Forward error correction Streaming media Multimedia communication Encoding Decoding Mobile communication Digital multimedia broadcasting

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MFSE: A Meta-Fusion Model for Polypharmacy Side-Effect Prediction with Graph Neural Networks

MFSE: A Meta-Fusion Model for Polypharmacy Side-Effect Predi...

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International Conference on Tools for Artificial Intelligence (ICTAI)

作者： Aggelos Ragkousis Olga Flogera Vasileios Megalooikonomou Department of Electrical and Computer Engineering University of Patras Patras Greece Department of Computer Science and Informatics University of Patras Patras Greece

Despite being a very popular approach for treating complex diseases, polypharmacy can lead to increased risk of adverse side effects, many of which are observed after the drugs have been released in the market. Luckily, the significant increase in data availability of observed adverse side-effects has paved the way for machine learning approaches to assist in their prediction. In this work, we first present a novel framework for multi-relational link prediction with graph neural networks. Given a multi-relational graph, we create relation-specific vector representations for each node of the graph. With this approach, we create drug vector representations that are side-effect specific, by integrating external molecular and protein-target information with the drug information that is generated directly from the drug-drug interaction prediction graph. With our new meta-fusion approach, each information type is produced from a distinct G NN - based encoder architecture and then the integration is performed according to the side-effect type being predicted. While state-of-the-art models report maximum AUROC scores of 0.91, our technique reaches a score of 0.95. Also, we show that our fusion approach provides valuable external knowledge particularly to drug nodes in the prediction graph that have a smaller node degree.

关键词： Drugs Proteins Machine learning Artificial neural networks Predictive models Graph neural networks Diseases

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Utilising noise effects on infrared pattern reception for position estimation on a grid plane

Utilising noise effects on infrared pattern reception for po...

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International Conference on Emerging Technologies and Factory Automation (ETFA)

作者： N. Petrellis N. Konofaos G. Alexiou Department of Computer Engineering and Informatics University of Patras Greece Department of Information and Communication Systems Engineering University of Aegean Greece

In this paper we present a way to locate the position of a moving target on a grid plane of about 15 square meters with an estimation error of less than half of the grid node distance. The estimation method is based on the success rate that the infrared patterns transmitted from two constant positions is received by the moving target. Several aspects of the reception such as the number of the expected, scrambled or out of order patterns that are recognised are considered. They are all playing an important role in determining the coordinates of the target. An ultra low cost system architecture based on commercial components is presented. A proper carrier filter of 1 MHz centre frequency is also studied in order to achieve fast coordinate estimation. The accuracy of the position estimation algorithm is also discussed with respect to the effect of the grid node distance.

关键词： Infrared detectors Transceivers informatics Out of order Pattern recognition Costs Frequency estimation Time measurement Light emitting diodes Pulse width modulation

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Plasma sheet thinning due to loss of near-Earth magnetotail plasma

arXiv

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arXiv 2020年

作者： Tretler, Rudolf Tatsuno, Tomo Hosokawa, Keisuke Department of Communication Engineering and Informatics Department of Computer and Network Engineering University of Electro-Communications Tokyo182-8585 Japan

A one-dimensional model for thinning of the Earth's plasma sheet [J. K. Chao et al., Planet. Space Sci. 25, 703 (1977)] according to the Current Disruption (CD) model of auroral breakup is extended to two dimensions. A rarefaction wave, which is a signature component of the CD model, is generated with an initial disturbance. In the 1D gas model, the rarefaction wave propagates tailward at sound velocity and is assumed to cause thinning. Extending to a 2D gas model of a simplified plasma sheet configuration, the rarefaction wave is weakened, and the thinning ceases to propagate. Extending further to a 2D plasma model by adding magnetic field into the lobes, the rarefaction wave is quickly lost in the plasma sheet recompression, but the plasma sheet thinning is still present and propagates independently at a slower velocity than a 1D model suggests. This shows that the dynamics of plasma sheet thinning may be dominated by sheet-lobe interactions that are absent from the 1D model and may not support the behaviour assumed by the CD model. Copyright © 2020, The Authors. All rights reserved.

关键词： Magnetohydrodynamics

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Cloud services for medical image processing: Application of service science and slow intelligence systems 18

Cloud services for medical image processing: Application of ...

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18th International Conference on Distributed Multimedia Systems, DMS 2012

作者： Peng, Kang-Lin Chang, Shi-Kuo Tseng, Yu-Chee Deserno, Thomas M. Institute of Service Industries and Management Minghsin University of Science and Technology Institute of Computer Science and Engineering National Chiao Tung University Hsinchu Taiwan Department of Computer Science University of Pittsburgh Pittsburgh United States College of Computer Science National Chiao Tung Univeristy Hsinchu Taiwan Department of Medical Informatics RWTH Aachen University Aachen Germany

ISBN: (纸本)1891706322

Cloud services could be an effective solution for future medical image processing for computer-aided diagnosis (CAD). This research applies the concept of service science and Slow Intelligence System to enhance the value of medical image processing. A team from Germany, Taiwan and the US will cooperate to construct and improve the techniques and quality of cloud services for medical image processing for CAD. The goals are to design a system of cloud services for medical image processing, which could enhance the effectiveness of diagnosis and provide people with better medical care as well as to explore a concept of the Service Intelligence from this research. © 2012 by Knowledge Systems Institute Graduate School.

关键词： computer aided diagnosis

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