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International Conference on Broadband, Wireless Computing, Communication and Applications (BWCCA)

作者： Shinji Sakamoto Tetsuya Oda Makoto Ikeda Leonard Barolli Santi Caballé Fatos Xhafa Graduate School of Engineering Fukuoka Institute of Technology (FIT) Higashi-Ku Fukuoka Japan Department of Computer Science Multimedia and Telecommunication Open University of Catalonia (UOC) Barcelona Spain Departament de Laenguages and System Informatics Systems Technical University of Catalonia Barcelona Spain

One of the key advantages of Wireless Mesh Networks (WMNs) is their importance for providing cost-efficient broadband connectivity. There are issues for achieving the network connectivity and user coverage, which are related with the node placement problem. In this work, we consider the router node placement problem in WMNs. We want to find the optimal distribution of router nodes in order to provide the best network connectivity and user coverage in a set of uniformly distributed clients. From the simulation results, we conclude that, when the number of mesh clients is small, a small number of mesh routers are needed in order to optimize the size of Giant Component (GC) and number of covered mesh clients (NCMC). However, some of mesh routers can not cover the clients. On the other hand, when the number of mesh clients is big, many mesh routers are needed to optimize the GC and the NCMC. In this case, a mesh router can cover more than one mesh clients.

关键词： Network topology Topology Wireless communication Simulation Simulated annealing Broadband communication Electronic mail

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Beyond the transfer-and-merge wordnet construction: PlWordNet and a comparison with WordNet

Beyond the transfer-and-merge wordnet construction: PlWordNe...

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9th International Conference on Recent Advances in Natural Language Processing, RANLP 2013

作者： Maziarz, Marek Piasecki, Maciej Rudnicka, Ewa Szpakowicz, Stan Institute of Informatics Wroclaw University of Technology Poland Institute of Computer Science Polish Academy of Sciences Poland School of Electrical Engineering and Computer Science University of Ottawa Canada

Wordnets are lexico-semantic resources essential in many NLP tasks. Princeton WordNet is the most widely known, and the most influential, among them. Wordnets for languages other than English tend to adopt unquestioninglyWordNet's structure and its net of lexicalised concepts. We discuss a large wordnet constructed independently of WordNet, upon a model with a small yet significant difference. A mapping ontoWordNet is under way;the large portions already linked open up a unique perspective on the comparison of similar but not fully compatible lexical resources. We also try to characterise numerically a wordnet's aptitude for NLP applications.

关键词： Natural language processing systems

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On interpretation of fuzzy cognitive maps trained to model time series

On interpretation of fuzzy cognitive maps trained to model t...

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World Congress on Information and Communication Technologies (WICT)

作者： Wladyslaw Homenda Agnieszka Jastrzebska Witold Pedrycz Faculty of Economics and Informatics in Vilnius University of Bialystok Vilnius Lithuania Faculty of Mathematics and Information Science Warsaw University Technology Warsaw Poland Systems Research Institute Polish Academy of Sciences Warsaw Poland Department of Electrical & Computer Engineering University of Alberta Edmonton Canada

The article analyzes consecutive phases of time series modelling with Fuzzy Cognitive Maps. The subject of interest are features determining models of good quality. First, we present the procedure: design phase, learning phase, and in the end - application. The discussion is illustrated with experiments on two synthetic time series. We have shown that the design phase determines qualitative and quantitative effectiveness of modelling. We have addressed effects of misdesigns: too large, too small or unfit at all maps on modelling quality.

关键词： Time series analysis Fuzzy cognitive maps Analytical models Biological system modeling Couplings Bibliographies Numerical models

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Caching of Content-Centric Networking under bursty content requests

Caching of Content-Centric Networking under bursty content r...

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IEEE Conference on Wireless Communications and Networking

作者： Haozhe Wang Geyong Min Jia Hu Hao Yin Wang Miao School of Computing Informatics and Media University of Bradford UK College of Engineering Mathematics and Physical Sciences University of Exeter UK Department of Computer Science Liverpool Hope University UK Research Institute of Information Technology Tsinghua University P. R. China

ISBN: (纸本)9781479930845

The rapid development in wireless technologies and multimedia services has given rise to new requirements for the Internet, such as supporting billions of mobile devices and transmitting huge amount of multimedia content in real time. Content-Centric Networking (CCN), a future Internet architecture for efficient content dissemination, has been attracting ever-increasing attention from both academia and industry. In this paper, a new analytical model is developed as a cost-effective tool to investigate the performance of caching in CCN under bursty content requests. The accuracy of the model is validated through comparing the analytical results with those obtained from the extensive simulation experiments. As an example of its applications, the analytical model is used to investigate the effects of the cache size, content size, and bursty content requests on the cache hit ratio in CCN.

关键词： Analytical models Mobile communication Internet Wireless networks Educational institutions Mobile computing Accuracy

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Classification with a limited space of features: Improving quality by rejecting misclassifications

Classification with a limited space of features: Improving q...

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World Congress on Information and Communication Technologies (WICT)

作者： Wladyslaw Homenda Agnieszka Jastrzebska Witold Pedrycz Radoslaw Piliszek Faculty of Economics and Informatics in Vilnius University of Bialystok Vilnius Lithuania Faculty of Mathematics and Information Science Warsaw University Technology Warsaw Poland Systems Research Institute Polish Academy of Sciences Warsaw Poland Department of Electrical & Computer Engineering University of Alberta Edmonton Canada

Classification, especially in the case of a small space of features, is prone to errors. This is more important when it is costly to gain data from samples to calculate the values for futures. We study what effect limiting the space of features has on the performance of built classifiers and how the quality of classification can be improved by rejecting misclassified elements.

关键词： Support vector machines Accuracy Vegetation computer architecture Training Vectors Symmetric matrices

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Efficient adaptive equalization of doubly dispersive channels in MIMO-FBMC/OQAM systems

Efficient adaptive equalization of doubly dispersive channel...

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International Symposium on Wireless Communication Systems (ISWCS)

作者： C. Mavrokefalidis A. Rontogiannis E. Kofidis A. Beikos S. Theodoridis Patras University Campus Computer Technology Institute and Press “Diophantus” Patras Greece IAASARS National Observatory of Athens Penteli Greece Dept. of Statistics and Insurance Science University of Piraeus Piraeus Greece Dept. of Informatics and Telecommunications University of Athens Athens Greece

ISBN: (纸本)9781479958641

The problem of adaptively equalizing doubly dispersive MIMO channels for FBMC/OQAM systems is studied in this paper. The challenges in this type of multicarrier systems include their intrinsic self-interference and the need to cope with time- and frequency-selective subchannels in realistic propagation conditions. An efficient and numerically stable algorithm is adopted, relying on a decision feedback structure that implements BLAST ordering for the input signals recovery. The ability of this algorithm to address the above challenges has been demonstrated. The focus of this paper is on reducing the needs of this equalizer in training information. A channel estimate-based (re-)initialization scheme is developed and shown to be quite effective in lowering the training overhead, at an affordable additional cost in complexity. For the sake of comparison, the MIMO-OFDM problem is also studied. Simulation results for practical scenarios demonstrate the effectiveness of the proposed approach.

关键词： OFDM Decision feedback equalizers Channel estimation MIMO Vectors Training

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Using ILP/SAT to determine pathwidth, visibility representations, and other grid-based graph drawings

Using ILP/SAT to determine pathwidth, visibility representat...

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21st International Symposium on Graph Drawing, GD 2013

作者： Biedl, Therese Bläsius, Thomas Niedermann, Benjamin Nöllenburg, Martin Prutkin, Roman Rutter, Ignaz David R. Cheriton School of Computer Science University of Waterloo Canada Institute of Theoretical Informatics Karlsruhe Institute of Technology Germany

ISBN: (纸本)9783319038407

We present a simple and versatile formulation of grid-based graph representation problems as an integer linear program (ILP) and a corresponding SAT instance. In a grid-based representation vertices and edges correspond to axis-parallel boxes on an underlying integer grid;boxes can be further constrained in their shapes and interactions by additional problem-specific constraints. We describe a general d-dimensional model for grid representation problems. This model can be used to solve a variety of NP-hard graph problems, including pathwidth, bandwidth, optimum st-orientation, area-minimal (bar-κ) visibility representation, boxicity-κ graphs and others. We implemented SAT-models for all of the above problems and evaluated them on the Rome graphs collection. The experiments show that our model successfully solves NP-hard problems within few minutes on small to medium-size Rome graphs. © 2013 Springer International Publishing Switzerland.

关键词： Integer programming

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Geometric and Photometric Data Fusion in Non-Rigid Shape Analysis

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Numerical Mathematics(Theory,Methods and Applications) 2013年第1期6卷 199-222页

作者： Artiom Kovnatsky Dan Raviv Michael M.Bronstein Alexander M.Bronstein Ron Kimmel Institute of Computational Science Faculty of InformaticsUniversitàdella Svizzera ItalianaLuganoSwitzerland School of Electrical Engineering Tel Aviv UniversityIsrael Technion–Israel Institute of Technology Computer Science DepartmentHaifaIsrael

In this paper,we explore the use of the diffusion geometry framework for the fusion of geometric and photometric information in local and global shape *** construction is based on the definition of a diffusion process on the shape manifold embedded into a high-dimensional space where the embedding coordinates represent the photometric *** results show that such data fusion is useful in coping with different challenges of shape analysis where pure geometric and pure photometric methods fail.

关键词： Laplace-Beltrami operator diffusion equation heat kernel descriptors 3D shape retrieval deformation invariance

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Eight-channel second-order ring resonator based SOI multiplexers/demultiplexers for optical interconnects

Eight-channel second-order ring resonator based SOI multiple...

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European Conference on Optical Communication (ECOC)

作者： S. Papaioannou G. Dabos K. Vyrsokinos G. Giannoulis A. Prinzen C. Porschatis M. Waldow D. Apostolopoulos H. Avramopoulos N. Pleros Information Technologies Institute Center for Research & Technology Hellas Thessaloniki Greece Department of Informatics Aristotle University of Thessaloniki Greece National Technical University of Athens Athens GR AMO GmbH Aachen Germany School of Electrical & Computer Engineering National Technical University of Athens Greece

We demonstrate two 8×1 silicon ring-based multiplexers for dual stream multiplexing. All resonances were thermo-optically tuned and spaced by 100GHz having >40GHz bandwidth. Error-free performance without sign... 详细信息

关键词： Wavelength division multiplexing Silicon Channel spacing Tuning Bit error rate Optical interconnections

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A Methodological Approach to Provide Effective Web-Based Training by Using Collaborative Learning and Social Networks

A Methodological Approach to Provide Effective Web-Based Tra...

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International Conference on Complex, Intelligent and Software Intensive Systems, CISIS

作者： Santi Caballé David Britch Leonard Barolli Fatos Xhafa Department of Computer Science Multimedia and Telecommunication Open University of Catalonia Barcelona Spain Content Development Services CM Group Bristol USA Department of Information and Communication Engineering Fukuoka Institute of Technology Japan Department of Languages and Informatics Systems Technical University of Catalonia Barcelona Spain

This paper presents an approach to rebuild the benefits lost from moving from traditional Instructor-led Training to Web-based Training by using computer-Supported Collaborative Learning and Social Networks. The innovative approach of using Learning Analytics and Educational Data Mining techniques to track and analyse the interactive behavior of on-line collaborative learning and social networks is explored to enhance and improve corporate distance training. The results of this multidisciplinary proposal addressing pedagogical, technological and business issues to support Web-based Training becomes decisive for enhancing and improving the overall distance training experience and for finding new opportunities for cost-effective ways to deliver training programs. We believe the outcomes of this research will be crucial for greatly enhance and improve corporate distance training.

关键词： Training Collaboration Collaborative work Data mining Computational modeling Social network services

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