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Experimental Evaluation of Duplicate Insensitive Counting Algorithms

Experimental Evaluation of Duplicate Insensitive Counting Al...

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Panhellenic Conference on informatics (PCI)

作者： Michael Resvanis Ioannis Chatzigiannakis Department of Computer Engineering and Informatics University of Patras Patras Greece Research Academic Computer Technology Institute and Department of Computer Engineering and Informatics University of Patras Patras Greece

Online and realtime counting and estimating the cardinality of sets is highly desirable for a large variety of applications, representing a foundational block for the efficient deployment and access of emerging Internet scale information systems. In this work we implement three well known duplicate insensitive counting algorithms and evaluate their performance in a testbed of resource-limited commercial off-the-shelf hardware devices. We focus on devices that can be used in wireless mobile and sensor applications and evaluate the memory complexity, time complexity and absolute error of the algorithms under different realistic scenario. Our findings indicate the suitability of each algorithm depending on the application characteristics.

关键词： informatics Frequency estimation Hardware Peer to peer computing Sensor systems Aggregates Statistics Application software Internet Information systems

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Cross layer optimization of static lightpath demands in transparent WDM optical networks

Cross layer optimization of static lightpath demands in tran...

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IEEE (first ITW conference of the year) Information Theory Workshop (ITW)

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

We consider the offline version of the impairment-aware routing and wavelength assignment (IA-RWA) problem in transparent all-optical networks as a cross layer optimization problem. In optical networks and in the absence of regenerators, optical signal quality degrades due to physical layer impairments. We initially present an algorithm for solving the RWA problem based on an LP relaxation formulation that has acceptable integrality performance. To account for signal degradation due to physical layer impairments we extend our RWA formulation and constrain the interference among lightpaths using noise variance related parameters. The objective of the resulting optimization problem is not only to serve the connection requests by minimizing the number of utilized wavelengths, but also to select lightpaths that have acceptable physical layer performance.

关键词： Cross layer design Wavelength division multiplexing WDM networks Optical fiber networks Physical layer Repeaters Degradation Wavelength routing Wavelength assignment All-optical networks

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Personalized News Search in WWW: Adapting on user's behavior

Personalized News Search in WWW: Adapting on user's behavior

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International Conference on Internet and Web Applications and Services (ICIW)

作者： Christos Bouras Vassilis Poulopoulos Panagiotis Silintziris Research Academic Computer Technology Institute Rio-Patras Greece Computer Engineering and Informatics Department Rio-Patras Greece

Personalized Web Search becomes nowadays a promising option in the field of Information Retrieval and search engines design by improving both output quality and user experience. In this paper, we present and evaluate the subsystem, which conducts the Advanced and Personalized search of PeRSSonal, a web-based mechanism for the retrieval, processing and presentation of articles and RSS feeds collected from major news portals of the Internet. The proposed technique uses information explicitly provided by the user in his profile as well as information that the mechanism can learn from the user's behavior during his search and browsing sessions in the system. As this behavior dynamically evolves, the same happens to the user's interests under the prism of the search engine. By adopting this user-centric approach, we manage to present the user with better-refined and more focused results, incorporating his personal preferences to the output. The algorithm operates not in a stand-alone manner but it co-operates and binds with the rest of modules of PeRSSonal in order to accomplish maximum integration with the system. Furthermore, we introduce an enhancement in the search function, based on cached results from past search sessions of each user individually.

关键词： Article search engine Personalized search PeRSSonal

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Capturing User Session Orientation Based on Semantic Analysis and Concept Taxonomy

Capturing User Session Orientation Based on Semantic Analysi...

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Balkan Conference in informatics (BCI)

作者： John Garofalakis Theodoula Giannakoudi Danai Vergeti Computer Engineering & Informatics Department University of Patras Patras Greece Research Academic Computer Technology Institute Patras Greece

In this work, we propose a Web personalization methodology by detecting the user navigation's orientation. To this goal, we track user's hits and define whether a user specializes or generalizes his navigation through semantics analysis of the pages in his session window. An algorithm of capturing user session orientation based on a concept taxonomy is proposed. Finally, a method is presented which proposes useful recommendation to the user to improve his Web search. The experimental outcomes satisfied the prospective results. We believe that our technique could become a useful tool for navigation refinement. Furthermore, this work bridges search engine query refinement and browsing reformulation techniques.

关键词： Taxonomy Search engines Navigation Web search Web pages informatics Semantic Web Information retrieval Ontologies Bridges

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Simulcast transmission for video applications: Performance evaluation with an integrated simulation environment

Simulcast transmission for video applications: Performance e...

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International Symposium on Performance Evaluation of computer & Telecommunication Systems SPECTS

作者： Christos Bouras Georgios Kioumourtzis Apostolos Gkamas Computer Engineering and Informatics Department University of Patras Rion Greece Research Academic Computer Technology Institute Rion Greece

This paper presents the performance evaluation of a multi-rate multicast protocol named adaptive smooth simulcast protocol (ASSP) for simulcast video transmission. ASSP implements a single rate TCP-friendly protocol as the underlying congestion control mechanism for each simulcast stream. ASSP is built on top of the RTP/RTCP protocol and exploits the RTCP sender and receiver reports for the dissemination of feedback information. The key attributes of ASSP are: a) TCP-friendly behavior, b) adaptive per-stream transmission rates, c) adaptive scalability to large sets of receivers and finally d) smooth transmission rates that are suitable for multimedia applications. We evaluate the performance of ASSP under an integrated simulation environment, which extends ns-2 and Evalvid-RA into the multicast domain with the use of RTP/RTCP protocols. Simulations conducted under this environment combine the measurements of network metrics along with objective evaluation criteria on the perceived video quality by the end user.

关键词： Streaming media Multicast protocols Computational modeling Proposals Transport protocols computer simulation Scalability Bandwidth Application software informatics

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Load Balancing in a Cluster-Based P2P System

Load Balancing in a Cluster-Based P2P System

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Balkan Conference in informatics (BCI)

作者： John Garofalakis Theofanis-Aristofanis Michail Department of Computer Engineering & Informatics University of Patras Patras Greece Research Academic Computer Technology Institute Rio-Patras Greece

In this paper we study load balancing in a cluster based p2p system. The cluster based architecture is chosen after the study of various real systems. We then define the notion of load for that system and describe coefficients that measure the different parameters of load. We use these coefficients to define load factors that can be used to measure each node's load. These factors are also used in two algorithms that balance the load fairly among all peers in a cluster. We improve the algorithms' balancing performance using replication of popular objects. A set of metrics is used to evaluate the cost of each algorithm and the effect on system's performance. Our simulation results show that it is possible to improve the fairness on load distribution without replication but with a small reduce on system's throughput. And under the cost of replicating a small amount of objects we improve fairness without reducing system's throughput.

关键词： Load management Peer to peer computing Costs System performance Clustering algorithms Throughput Quality of service informatics computer architecture Measurement

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Performance evaluation of simulcast vs. layered multicasting over best-effort networks

Performance evaluation of simulcast vs. layered multicasting...

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International Conference on Software, Telecommunications and computer Networks (SoftCOM)

作者： Christos Bouras Apostolos Gkamas Georgios Kioumourtzis Computer Engineering and Informatics Department & Research Academic Compute Technology Institute University of Patras Rion Greece

ISBN: (纸本)9781424449736

Multi-rate multicast schemes can be broadly classified into two categories. In layered multicast, a video file is transmitted by a base layer, which contains the most important features of the video. Additional layers, called enhancement layers, contain data that refine the quality of the base layer. In simulcast, the video file is transmitted by replicated layers that contain the same content at different quality. The benefits of layered multicast versus simulcast are still under question, as layered multicast presents higher complexity and more challenging deployment than simulcast. In this paper, two multi-rate multicast control schemes are compared. The layered multicast SMCC congestion control against our proposed solution for simulcast transmission, named ASSP. We compare the two schemes under a controlled simulation environment with the network simulator software (ns-2) by taking into account the evaluation criteria in RFC 5166. The results demonstrate that both SMCC and ASSP are TCP-friendly while SMCC seems to suffers from small oscillations of the transmission rate. In network topologies with low complexity ASSP consumes no more bandwidth than SMCC for the transmission of the different simulcast streams, while being a simpler solution than the more complicated SMCC.

关键词： Streaming media Multicast protocols Bandwidth computer networks informatics Electronic mail Network topology Video coding Static VAr compensators Encoding

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An open and integrated management platform for wireless sensor networks

An open and integrated management platform for wireless sens...

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International Symposium on Autonomous Decentralized Systems (ISADAS)

作者： M. Kalochristianakis V. Gkamas G. Mylonas S. Nikoletseas E. Varvarigos J. Rolim Research Academic Computer Technology Institute Department of Computer Engineering and Informatics University of Patras Rio Greece Department of Computer Science University of Geneva Switzerland

We present the conceptual basis and the initial planning for an open source management architecture for wireless sensor networks (WSN). Although there is an abundance of open source tools serving the administrative needs of WSN deployments, there is a lack of tools or platforms for high level integrated WSN management. This is because of a variety of factors, including the lack of open source management tools, the immaturity of tools that offer manageability for WSNs, the limited high level management capabilities of sensor devices and architectures, and the lack of standardization. The current work is, to our knowledge, the first effort to conceptualize, formalize and design a remote, integrated management platform for the support of WSN research laboratories. The platform is based on the integration and extension of two innovative platforms: jWebDust, a WSN operation and management platform, and OpenRSM, an open source integrated remote systems and network management platform. The proposed system architecture can support several levels of integration (infrastructure management, functionality integration, firmware management), corresponding to different use-cases and application settings.

关键词： Wireless sensor networks computer architecture Remote monitoring computer network management Biomedical monitoring computerized monitoring computer networks Innovation management Microprogramming Application software

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Object categorization based on biologically inspired features using a hierarchical categorization system 9th

Object categorization based on biologically inspired feature...

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9th IFAC Symposium on Robot Control, SYROCO 2009

作者： Csapo, A. Resko, B. Sziebig, G. Hashimoto, H. Baranyi, P. Budapest Univ. of Technology and Economics Dept. of Telecommunications and Media Informatics Budapest Hungary Computer and Automation Research Institute Hungarian Academy of Sciences Budapest Hungary Budapest Univ. of Technology and Economics Dept. of Mechatronics Optics and Applied Informatics Budapest Hungary Univ. of Tokyo Institute of Industrial Science Tokyo Japan

ISBN: (纸本)9781617825583

The computerized modeling of cognitive visual information has been a research field of great interest in the past several decades. The research field is interesting not only from a biological perspective, but also from an engineering point of view when systems are developed that aim to achieve similar goals as biological cognitive systems. This paper briefly describes a general framework for the extraction and systematic storage of low-level visual features, and demonstrates its applicability in image categorization using a linear categorization algorithm originally developed for the characterization of text documents. The performance of the algorithm together with the newly developed feature array was evaluated using the Caltech 101 database. Extremely high (95% and higher) success rates were achieved when distinguishing between pairs of categories using independent test images. Efforts were made to scale up the number of categories using a hierarchical, branch-and-bound decision tree, with limited success.

关键词： Cognitive systems

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Evaluation of Single Rate Multicast Congestion Control Schemes for MPEG-4 Video Transmission

Evaluation of Single Rate Multicast Congestion Control Schem...

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Conference on Next Generation Internet Networks, NGI

作者： Christos Bouras Apostolos Gkamas Georgios Kioumourtzis Computer Engineering and Informatics Department University of Patras Greece Scientific Coordinator of Research Unit 6 Research Academic Computer Technology Institute Patras Greece

We present in this paper a simulation-based comparison of one of the best known multicast congestion control schemes - TFMCC - against our proposed adaptive smooth multicast protocol (ASMP). ASMP consists of a single-rate multicast congestion control, which takes advantage of the RTCP sender (SR) and receiver reports (RR) in order to adjust the sender's transmission rate in respect of the network conditions. The innovation in ASMP lays in the "smooth" transmission rate, which is TCP-friendly and prevent oscillations. We use an integrated simulation environment named Multi-Evalvid-RA for the evaluation of the two congestion control schemes. Multi-Evalvid-RA provides all the necessary tools to perform simulation studies and assess the video quality by using both network related metrics along with video quality measurements. The performance evaluation results show that ASMP is a very efficient solution for rate adaptive multimedia applications and a serious competitor to well know TFMCC.

关键词： MPEG 4 Standard Multicast protocols Video on demand informatics Computational modeling PSNR Paper technology Telecommunication traffic Traffic control Programmable control

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