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检索条件"机构=Computer Technology Institute and Department of Computer Engineeringand Informatics"

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Experimental Evaluation of Duplicate Insensitive Counting Algorithms

Experimental Evaluation of Duplicate Insensitive Counting Al...

引用

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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3D Internet for cognitive info-communication

3D Internet for cognitive info-communication

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10th International Symposium of Hungarian Researchers on Computational Intelligence and informatics, CINTI 2009

作者： Baranyi, Péter Solvang, Bjørn Hashimoto, Hideki Korondi, Péter Computer and Automation Research Institute Hungary Department of Industrial Engineering Narvik University College Norway Institute of Industrial Science University of Tokyo Japan Department of Mechatronics Budapest University of Technology and Economics Optics and Applied Informatics Hungary

The paper presents new research directions both for 3D internet and cognitive info-communication. It reviews basic concepts and definitions and gives some "historical" view that helps to understand current i... 详细信息

关键词： 3D internet Cognitive info-communication Robot control

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Towards the construction of intuitionistic fuzzy cognitive maps for medical decision making

Towards the construction of intuitionistic fuzzy cognitive m...

引用

IEEE EMBS International Conference on Information technology Applications in Biomedicine (ITAB)

作者： E.I. Papageorgiou D.K. Iakovidis Department of Informatics and Computer Technology Technological Educational Institute of Lamia Greece

FCMs are appropriate to explicitly encode the knowledge and experience accumulated on the operation of a complex system. Once constructed for a particular domain, an FCM allows a qualitative simulation of the system. In this paper, we investigate a first approach to introduce intuitionistic fuzzy logic into the construction process of FCMs for improved medical decision making. The theory of intuitionistic fuzzy sets provides a sound mathematical model suitable for modeling the imprecision that is inherent in real world problems. It is employed to the step where the fuzzy if-then rules are used for the determination of cause-effect relationships assigning linguistic weights among the concepts. The novel intuitionistic FCM proposed in this paper are implemented by introducing a factor of hesitancy into the weights of a standard FCM. This factor provides an additional cue on the cause-effect relationships among concepts. The results from its experimental evaluation on a medical decision making problem that is critical to patient safety, indicate its effectiveness and open perspectives for its general applicability.

关键词： Fuzzy cognitive maps Decision making Fuzzy sets Fuzzy logic Mathematical model Neoplasms Medical simulation Safety Power system modeling Uncertainty

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Hierarchical Discovery of Patterns of Infections in Chest Radiographs Using Non-Negative Matrix Factorization

Hierarchical Discovery of Patterns of Infections in Chest Ra...

引用

International Conference on Systems, Signals and Image Processing, IWSSIP

作者： Dimitris K. Iakovidis Spyros Tsevas Department of Informatics and Computer Technology Technological Educational Institute of Lamia Greece

Chest radiography is a screening tool for the detection and the primary assessment of abnormalities consistent with the infections of the lower respiratory tract. Most commonly, the radiographic manifestations of bacterial infection are areas of consolidation with a segmental or lobar distribution which appear as areas of increased pulmonary opacity. This paper addresses the problem of the discovery of consolidation patterns in chest radiographs, by a methodology for automatic segregation of lung consolidations from normal lung parenchyma. The proposed methodology is based on non-negative matrix factorization (NMF) of pulmonary radiographic patterns represented by intensity histograms and Gabor textural features. NMF is considered as a soft clustering algorithm which is iteratively applied according to an hierarchical cluster-merging scheme. This scheme reckons with the resulting NMF bases so as to overcome the limitations associated with the geometry of the clusters. The experimentation results validate the effectiveness of the proposed methodology and demonstrate its comparative advantage over the conventional hierarchical and NMF partitional clustering algorithms.

关键词： Lungs Diagnostic radiography Educational technology Bacterial infections Histograms Clustering algorithms Geometry Microorganisms Ribs Image analysis

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Video transmission over TFRC using cross-layer power management

Video transmission over TFRC using cross-layer power managem...

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

作者： Christos Bouras Apostolos Gkamas Vaggelis Kapoulas Vassilis Papapanagiotou Kostas Stamos Giannis Zaoudis Computer Engineering and Informatics Department University of Patras Greece Research Academic Computer Technology Institute Greece

ISBN: (纸本)9781424449736

This paper presents the issues related to efficient transmission of encoded video (such as H.264) over wireless links using the TFRC protocol. It proposes a novel mechanism that utilizes cross-layer approaches for adaptation of the power transmission level of the sender and feedback information regarding the wireless connection status from the receiver for improved transmission statistics and therefore user experience without unnecessary power consumption. The mechanism is tested through simulations using ns2. Compared to the operation of the video transmission without the mechanism, we observe that it has benefits in terms of video quality.

关键词： Energy management Wireless networks Energy consumption Throughput Wireless application protocol Power engineering computing Propagation losses Signal to noise ratio Fading Interference

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Optimal MBMS Power Allocation Exploiting MIMO in LTE Networks

Optimal MBMS Power Allocation Exploiting MIMO in LTE Network...

引用

IEEE Conference on Vehicular technology (VTC)

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

In the frame of the Long Term Evolution (LTE) of mobile networks, the provision of rich multimedia services, such as Mobile TV, is considered of key importance for the LTE proliferation in mobile market. To this end, Multimedia Broadcast/Multicast Service (MBMS) is envisaged to play an instrumental role during LTE standardization process. MBMS was introduced in the Release 6 of Universal Mobile Telecommunication System (UMTS) in order to deliver multimedia data from a single source entity to multiple destinations. However, downlink capacity in such networks is limited by base station transmission power. As an aftermath, in MBMS efficient power allocation techniques should be implemented so as to ensure the mass provision of multimedia applications to mobile users. In this paper we propose a power control scheme for efficient selection of MBMS bearers. The proposed mechanism on the one hand manages to economically utilize power resources during MBMS transmissions, while on the other hand exploits the performance enhancements emerged from Multiple Input Multiple Output (MIMO) antennas used in LTE networks. Simulation results indicate that the proposed scheme results to significant power and capacity improvements.

关键词： MIMO Long Term Evolution Mobile TV Digital multimedia broadcasting Multimedia communication TV broadcasting Instruments Standardization 3G mobile communication Multimedia systems

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Algorithms for two versions of LCS problem for indeterminate strings

Algorithms for two versions of LCS problem for indeterminate...

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作者： Iliopoulos, Costas Rahman, M. Sohel Rytter, Wojciech Algorithm Design Group Department of Computer Science King's College London Strand London WC2R 2LS United Kingdom Department of Computer Science and Engineering Bangladesh University of Engineering and Technology Dhaka-1000 Bangladesh Institute of Informatics Warsaw University Warsaw Poland Department of Mathematics and Informatics Copernicus University Torun Poland

We study the complexity of the longest common subsequence (LCS) problem from a new perspective. By an indeterminate string (i-string, for short) we mean a sequence X = X[1]X[2]. X[n], where C Σ for each i, and Σ is a given alphabet of potentially large size. A subsequence of X is any usual string over Σ which is an element of the finite (but usually of exponential size) language X[i1]X[i2]. X[ip], where 1 ≤ i123. P ≤ n,p ≥ 0. Similarly, we define a supersequence of x. Our first version of the LCS. problem is Problem ILCS: for given i-strings X˜ and Ỹ, find their longest common subsequence. From the complexity point of view, new parameters of the input correspond to |Σ| and maximum size l of the subsets in X˜ and Ỹ. There is also a third parameter R, which gives a measure of similarity between X˜ and Ỹ. The smaller the R, the lesser is the time for solving Problem ILCS. Our second version of the LCS problem is Problem CILCS (constrained ILCS): for given i-strings X˜ and Ỹ and a plain string Z, find the longest common subsequence of X˜ and Ỹ which is, at the same time, a supersequence of Z. In this paper, we present several efficient algorithms to solve both ILCS and CILCS problems. The efficiency in our algorithms are obtained in particular by using an efficient data structure for special type of range maxima queries and fast multiplication of boolean matrices.

关键词： Problem solving

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An enhanced MBMS power control mechanism towards Long Term Evolution

An enhanced MBMS power control mechanism towards Long Term E...

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Wireless Telecommunications Symposium, WTS

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

Long Term Evolution (LTE) promises the delivery of rich multimedia services in a more power and spectral efficient way than its predecessor Universal Mobile Telecommunication System (UMTS). To this direction, the newly introduced Enhanced - Multimedia Broadcast/Multicast Service (E-MBMS) framework is envisaged to play a fundamental role during the LTE standardization. E-MBMS constitutes the successor of MBMS which was introduced in the Release 6 of UMTS in order to deliver multimedia data from a single source entity to multiple destinations. This paper proposes a novel mechanism for efficient radio bearer selection during E-MBMS transmissions in LTE networks. The proposed mechanism is based on the concept of transport channels combination (point-to-point and/or point-to-multipoint radio bearers) in any cell/sector of the network in which multicast users are residing. The mechanism is evaluated through several realistic scenarios and is compared with several radio bearer selection mechanisms in order to highlight the enhancements that it provides.

关键词： Power control Long Term Evolution 3G mobile communication Streaming media Power engineering computing Downlink Base stations Multimedia communication Power engineering and energy informatics

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A Service-Transparent and Self-Organized Optical Network Architecture

A Service-Transparent and Self-Organized Optical Network Arc...

引用

IEEE International Conference on Communications (ICC)

作者： K. Vlachos A. Siokis Computer Engineering and Informatics Department & Research Academic Computer Technology Institute University of Patras Rio Greece

In this paper, a new service oriented networking paradigm is presented, where network nodes (peers) are self- organized into individual service entities. The key idea relies on the overlay approach, where there exists a virtual service plane, fragmented into self-organized and self-managed entities called islands of service transparency. The islands are formed in an upstream, ad-hoc mode from the non-networking resources (i.e VoD, grid server, etc) towards all ingress routers of the network, using link state advertisements and multi-cost path selection algorithms (i.e residual bandwidth, server capacity, storage, etc). Organization and re-organization of nodes around non-network resources is transparent to end-users, and thus any request within a specific service island is transparently routed to the island's resource for execution. A service proxy is commissioned to resolve service addresses and service attributes to QoS metrics. In this paper, we present the main notations and metrics of the proposed architecture as well as node behavior and potential GMPLS extensions for implementation issues.

关键词： Optical fiber networks Peer to peer computing computer networks Optical computing Network servers Bandwidth Communications Society computer architecture informatics Open systems

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CUTER: An Efficient Useful Text Extraction Mechanism

CUTER: An Efficient Useful Text Extraction Mechanism

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International Conference on Advanced Information Networking and Applications Workshops (AINAW)

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

In this paper we present CUTER, a system that processes HTML pages in order to extract the useful text from them. The mechanism is focalized on HTML pages that include news articles from major portals and blogs. As useful text we define the body of the article that contains the news report. In order to extract the body 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 store the text from the nodes that are characterized as useful text nodes. CUTER is 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 CUTER is to feed peRSSonal with the body of the. In this paper we present the basic algorithms and experimental results on the efficiency of the CUTER text extractor.

关键词： Data mining HTML Web pages Blogs computer networks Portals Information analysis Application software informatics Feeds

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