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MBMS power planning in macro and micro cell environments

MBMS power planning in macro and micro cell environments

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12th IEEE Symposium on computers and Communications

作者： Alexiou, Antonios Bouras, Christos Kokkinos, Vasileios Rekkas, Evangelos Research Academic Computer Technology Institute Greece Computer Engineering and Informatics Dept. Univ. of Patras Greece

ISBN: (纸本)9781424415205

Multimedia Broadcast Multicast Services (MBMS), introduced in Third Generation Partnership Project (3GPP) Release 6, is a point-to-multipoint downlink bearer service that addresses the need for the efficient usage of the expensive radio resources. Power control is one of the most important aspects in MBMS due to the fact that Node B's transmission power is a limited resource and must be shared among all MBMS users in a cell. Consequently, the analysis of transmitted power plays a fundamental role in the planning and optimization process of Universal Mobile Telecommunications System (UMTS) radio access networks. This paper investigates several factors affecting Node B's transmission power levels such as, cell deployment, propagation models, Quality of Service (QoS) requirements, users' distributions and mobility issues. Finally different transport channels for the transmission of the multicast data over the UTRAN interfaces are considered.

关键词： Universal Mobile Telecommunications System

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Load distribution fairness in P2P data management systems

Load distribution fairness in P2P data management systems

引用

23rd International Conference on Data Engineering, ICDE 2007

作者： Pitoura, Theoni Triantafillou, Peter Research Academic Computer Technology Institute Computer Engineering and Informatics Dept. University of Patras Greece

ISBN: (纸本)1424408032

We address the issue of measuring storage, or query load distribution fairness in peer-to-peer data management systems. Existing metrics may look promising from the point of view of specific peers, while in reality being far from optimal from a global perspective. Thus, first we define the requirements and study the appropriateness of various statistical metrics for measuring load distribution fairness towards these requirements. The metric proposed as most appropriate is the Gini coefficient (G). Second, we develop novel distributed sampling algorithms to compute G on-line, with high precision, efficiently, and scalably. Third, we show how G can readily be utilized on-line by higher-level algorithms which can now know when to best intervene to correct load imbalances. Our analysis and experiments testify for the efficiency and accuracy of these algorithms, permitting the online use of a rich and reliable metric, conveying a global perspective of the distribution. © 2007 IEEE.

关键词： Information management

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Emulating lossless, one-way signaling protocols in OBS networks with traffic prediction

Emulating lossless, one-way signaling protocols in OBS netwo...

引用

ONDM 2008 - 12th Conference on Optical Network Design and Modelling

作者： Monoyios, Demetris Vlachos, Kyriakos Computer Engineering and Informatics Department Research Academic Computer Technology Institute University of Patras Rio Greece

ISBN: (纸本)9783901882272

In this paper, we propose a new scheme for on demand reservation of capacity in OBS networks, emulating one-way signaling protocols. The proposed framework relies on the combination of a two-way reservation protocol and a burst assembly scheme with a burstification delay enforced to be the round-trip-time and which incorporates a Least Mean Square filter to predict burst length. Upon the arrival of the first packet in the burst queue, a control packet (setup message) is generated and transmitted to reserve resources, based on the prediction filter. In this way the reservation process starts/ends simultaneously with the burst assembly process. In this paper, we present the main features of the proposed scheme, evaluate its performance for both homogeneous and non-homogeneous traffic and we further propose an extension with aggressive overprovisioning of resources that can guarantee lossless operation even for extremely cases of bursty traffic.

关键词： Optical burst switching

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A web services-oriented architecture for integrating small programmable objects in the web of things

A web services-oriented architecture for integrating small p...

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International Conference on Developments in ESystems Engineering

作者： Akribopoulos, Orestis Chatzigiannakis, Ioannis Koninis, Christos Theodoridis, Evangelos Computer Engineering and Informatics Department University of Patras Greece Research Academic Computer Technology Institute Greece

ISBN: (纸本)9780769541600

In this work, we present a concrete framework, based on web services-oriented architecture, for integrating small programmable objects in the web of things. Functionality and data gathered by the Small Programmable Objects (SPO) are exposed using Web Services. Based on this, by exploiting XML encoding, SPO can be comprehensible by any web application. The architecture proposed is focused in providing secure and efficient interoperability between SPO and the web. Additionally, the proposed architecture provides management capabilities for deploying, maintaining and operating SPO applications across multiple networks. We present the multilayer architecture of our system and its implementation, which uses a combination of Java Standard and Micro Editions. Finally, we present a case study presenting our implementation. In this application we use SunSPOTs, which are wireless network motes developed by Sun Microsystems. © 2010 IEEE.

关键词： Web services

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A quantitative and qualitative analysis of blocking in association rule hiding

A quantitative and qualitative analysis of blocking in assoc...

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WPES'04: Proceedings of the 2004 ACM Workshop on Privacy in the Electronic Society

作者： Pontikakis, Emmanuel D. Tsitsonis, Achilleas A. Verykios, Vassilios S. Theodoridis, Yannis Chang, Liwu Dept. of Computer Engineering and Informatics University of Patras Research and Academic Computer Technology Institute Athens Greece Dept. of Computer and Comm. Engineering University of Thessaly Research and Academic Computer Technology Institute Athens Greece Dept. of Informatics University of Piraeus Piraeus Research and Academic Computer Technology Institute Athens Greece Naval Research Laboratory Washington DC United States

ISBN: (纸本)1581139683

Data mining provides the opportunity to extract useful information from large databases. Various techniques have been proposed in this context in order to extract this information in the most efficient way. However, efficiency is not our only concern in this study. The security and privacy issues over the extracted knowledge must be seriously considered as well. By taking this into consideration, we study the procedure of hiding sensitive association rules in binary data sets by blocking some data values and we present an algorithm for solving this problem. We also provide a fuzzification of the support and the confidence of an association rule in order to accommodate for the existence of blocked/unknown values. In addition, we quantitatively compare the proposed algorithm with other already published algorithms by running experiments on binary data sets, and we also qualitatively compare the efficiency of the proposed algorithm in hiding association rules. We utilize the notion of border rules, by putting weights in each rule, and we use effective data structures for the representation of the rules so as (a) to minimize the side effects created by the hiding process and (b) to speed up the selection of the victim transactions. Finally, we discuss the advantages and the limitations of blocking. Copyright 2004 ACM.

关键词： Data mining

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Profiling TCP traffic in optical burst switching networks

Profiling TCP traffic in optical burst switching networks

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7th International ICST Conference on Broadband Communications, Networks, and Systems, BROADNETS 2010

作者： Ramantas, Kostas Vlachos, Kyriakos Computer Engineering and Informatics Department and Research Academic Computer Technology Institute University of Patras Rio Greece

ISBN: (纸本)9783642303753

The efficient transmission of TCP traffic over OBS networks is a challenging problem, due to the high sensitivity of TCP congestion control mechanism to losses. In this paper, a traffic profiling scheme is proposed for gathering TCP flow statistics, which are used to estimate steady-state performance of TCP traffic over OBS networks. The burst assembly unit, in parallel to the assembly process, can inspect TCP traffic, keeping traffic statistics that can be used for throughput estimations. In this paper, we detail the traffic profiling and estimation mechanism and also provide analytical and simulation results to assess its performance. © 2012 ICST institute for computer Science, Social Informatics and Telecommunications Engineering.

关键词： Optical burst switching

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Image extraction from online text streams: A straightforward template independent approach without training

Image extraction from online text streams: A straightforward...

引用

24th IEEE International Conference on Advanced Information Networking and Applications Workshops, WAINA 2010

作者： Adam, George Bouras, Christos Poulopoulos, Vassilis Research Academic Computer Technology Institute Computer Engineer and Informatics Department University of Patras Patras Greece

ISBN: (纸本)9780769540191

In this paper we present an efficient system that processes HTML pages in order to extract the useful images from them. The proposed mechanism is template independent and is focalized on HTML pages that include news articles from major portals and blogs. As useful images we define the pictures that are relevant to the news report. In order to extract the image objects of the article we deconstruct the HTML page to its DOM model and we apply a set of algorithms in order to clean and correct the HTML code, locate and characterize each node of the DOM model and finally keep the nodes that are characterized as useful nodes. The proposed mechanism is applied as a subsystem of peRSSonal, a web tool that is used to obtain news articles from all over the world, process them and present them back to the end users in a personalized manner. The role of the mechanism is to feed peRSSonal's database with digital images for browsing and searching purposes. We present the basic algorithms and experimental results on the efficiency of the proposed implementation. © 2010 IEEE.

关键词： Image annotation

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A combined TCP aware scheduling and assembly scheme for OBS networks

A combined TCP aware scheduling and assembly scheme for OBS ...

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2009 6th International Conference on Broadband Communications, Networks and Systems, BROADNETS 2009

作者： Ramantas, Kostas Vlachos, Kyriakos Computer Engineering and Informatics Department Research Academic Computer Technology Institute University of Patras Rio Greece

ISBN: (纸本)9789639799493

The efficient transmission of TCP traffic over OBS networks is a challenging problem, due to the high sensitivity of TCP congestion control mechanism to losses. In this work, we propose solutions to this problem, through the burst assembly and scheduling mechanism of OBS. We investigate and propose algorithms to achieve performance enhancements for TCP traffic by taking into account TCP state information. We prove our claims with references to well-established TCP models, and validate the proposed algorithms through simulations.

关键词： Optical burst switching

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Elastic bandwidth allocation in flexible OFDM-based optical networks (Invited paper)

Elastic bandwidth allocation in flexible OFDM-based optical ...

引用

7th International ICST Conference on Broadband Communications, Networks, and Systems, BROADNETS 2010

作者： Christodoulopoulos, Konstantinos Computer Engineering and Informatics Department University of Patras Research Academic Computer Technology Institute Patra Greece

ISBN: (纸本)9783642303753

Orthogonal Frequency Division Multiplexing (OFDM) has recently been proposed as a modulation technique for optical networks, because of its good spectral efficiency, flexibility, and tolerance to impairments. We consider the planning problem of an OFDM optical network, where connections are provisioned for their requested rate by elastically allocating spectrum using a variable number of OFDM subcarriers and choosing an appropriate modulation level taking into account the transmission distance. Using algorithms developed in our previous works, we evaluate the spectrum utilization gains that can be obtained by utilizing the elastic bandwidth allocation of OFDM, when compared to a traditional WDM network. © 2012 ICST institute for computer Science, Social Informatics and Telecommunications Engineering.

关键词： Orthogonal frequency division multiplexing

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Efficient extraction of news articles based on RSS crawling

Efficient extraction of news articles based on RSS crawling

引用

1st International Conference on Machine and Web Intelligence, ICMWI 2010

作者： Adam, George Bouras, Christos Poulopoulos, Vassilis Research Academic Computer Technology Institute Computer and Informatics Engineer Department University of Patras Patras Greece

ISBN: (纸本)9781424486113

The expansion of the World Wide Web has led to a state where a vast amount of Internet users face and have to overcome the major problem of discovering desired information. It is inevitable that hundreds of web pages and weblogs are generated daily or changing on a daily basis. The main problem that arises from the continuous generation and alteration of web pages is the discovery of useful information, a task that becomes difficult even for the experienced internet users. Many mechanisms have been constructed and presented in order to overcome the puzzle of information discovery on the Internet and they are mostly based on crawlers which are browsing the WWW, downloading pages and collect the information that might be of user interest. In this manuscript we describe a mechanism that fetches web pages that include news articles from major news portals and blogs. This mechanism is constructed in order to support tools that are used to acquire news articles from all over the world, process them and present them back to the end users in a personalized manner. © 2010 IEEE.

关键词： Extraction

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