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IEEE International Symposium on Personal, Indoor and Mobile Radio Communications

作者： David M. Gutierrez-Estevez Berk Canberk Ian F. Akyildiz Broadband Wireless Network Laboratory School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta Georgia 30332 USA. Dept. of Computer Engineering Computer and Informatics Faculty Istanbul Technical University Ayazaga 34469 Istanbul-Turkey

ISBN: (纸本)9781467325660

Two-tier femtocell-based networks have been proposed as an economic solution to improve coverage and capacity in wireless cellular systems. Although widely studied in the literature, interference management in these networks remains as a technical challenge in need of effective solutions. In particular, the interference estimation is a relevant portion of the problem that enables correct operation of interference management schemes relying on this information. In this paper, a novel downlink cross-tier interference estimation approach is proposed based on spatio-temporal correlation techniques. An ordinary Kriging interpolator using Semivariogram Analysis is applied to the interfering signal followed by an autorregressive model. The signal estimation at the interfered users' location is exploited at the radio resource manager of the femtocell or macrocell base station by formulating a resource allocation problem that is solved by means of a heuristic algorithm. A practical procedure implementing this scheme in the network is also proposed. Numerical results show how performance of crosstier interference management approaches can be optimized by implementing this idea.

关键词： Spatio-Temporal correlation techniques Two-tier

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On formal models for cognitive linguistics

On formal models for cognitive linguistics

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IEEE International Conference on Cognitive informatics

作者： Yingxu Wang Robert C. Berwick International Institute of Cognitive Informatics and Cognitive Computing (ICIC) University of Calgary Calgary Alberta Canada T2N 1N4 Dept. of Brain and Cognitive Science & Dept. Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge MA 02139 USA

Cognitive linguistics is an emerging discipline that studies the cognitive properties of natural languages and the cognitive models of languages in computational linguistics, cognitive computing, and computational intelligence. This paper presents the theoretical framework of cognitive linguistics in order to systematically formalize the syntaxes and grammars of natural languages. An abstract language model of cognitive linguistics is created at the top level. Based on it, the cognitive structures of languages at the levels of lexis, phrase, clauses, sentence, paragraph, and essay are formally modeled from the bottom up. Using contemporary denotational mathematics, the deductive grammar of English is formally modeled and rigorously analyzed. The basic research provides support for a wide range of applications in computational linguistics, cognitive informatics, online text processing, web search engines, machine language comprehension, autonomous machine learning, smart cell phones, semantic computing, and computing with words.

关键词： Grammar Semantics Pragmatics Computational modeling Natural languages Speech Mathematical model

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Poster abstracts

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Sleep and Biological Rhythms 2016年第1期5卷 A1-A189页

作者： J. Ferrie M. Shipley F. Cappuccio E. Brunner M. Miller M. Kumari M. Marmot A. Coenen J. L. Castillo F. Araya G. Bustamante L. Montecino C. Torres S. Oporto J. Gronli E. Fiske R. Murison B. Bjorvatn E. Sorensen R. Ursin C. M. Portas S. Rajaraman A. Gribok N. Wesensten T. Balkin J. Reifman N. Dursunoglu S. Ozkurt S. Baser O. Delen S. Sarikaya P. Sadler P. Mitchell D. Françon M. Decobert B. Herve A. Richard G. Griebel P. Avenet B. Scatton G. L. Fur D. Eckert A. Jordan A. Wellman S. Smith A. Malhotra D. White D. Bruck I. Thomas A. Kritikos W. Oertel K. Stiasny-Kolster D. Garcia-Borreguero W. Poewe B. Hoegl R. Kohnen E. Schollmayer J. Keffel C. Trenkwalder A. Valle S. Roizenblatt F. Fregni P. Boggio S. Tufik K. Ward L. Robertson L. Palmer P. Eastwood D. Hillman J. Lee S. Mukherjee V. de Padova G. Barbato G. Ficca I. Zilli P. Salzarulo M. Veldi T. Hion V. Vasar M. Kull L. Nowak J. Davis Y. Latzer O. Tzischinsky S. Crowley M. Carskadon M. Anca-Herschkovitsch D. Frey J. Ortega C. Wiseman C. Farley K. Wright A. Campbell A. Neill K. Spiegel R. Leproult E. Tasali N. Scherberg E. van Cauter A. T. Noradina N. A. Karim I. Norlinah A. A. Raymond R. Sahathevan B. Hamidon E. Werth R. Poryazova R. Khatami C. Bassetti R. G. Beran L. Ainley G. Holand J. Duncan H. Kinney B. Davis B. Hood S. Frey C. Schmidt M. Hofstetter P. Peigneux C. Cajochen W.-P. Hu J.-D. Li C. Zhang L. Boehmer J. Siegel Q.-Y. Zhou Y. Sagawa H. Kondo T. Takemura H. Kanayama Y. Kaneko M. Sato T. Kanbayashi Y. Hishikawa T. Shimizu A. Viola L. James L. Schlangen D.-J. Dijk R. Andretic Y.-C. Kim K.-A. Han F. Jones R. Greenspan L. Sanford L. Yang X. Tang K. Dieter E. Uta H. Sven M. Richard N. Oyane S. Pallesen F. Holsten Y. Inoue M. Fujita N. Emura K. Kuroda N. Uchimura A. Johnston J. Astbury G. Kennedy K. Hoedlmoser M. Schabus T. Pecherstorfer S. Moser G. Gruber P. Anderer W. Klimesch N. Naidoo M. Ferber A. Pack D. Neu O. Mairesse G. Hoffmann A. Dris L. Lambrecht P. Linkowski P. Verbanck O. Le Bon N. Matsuura M. Yamao N. Adachi R. Aritomi Y. Komada H. Tanaka S. Shirak University College London London UK University College London London USA Warwick Medical School London UK Warwick Medical School Coventry USA Radboud University Nijmegen Nijmegen Netherlands Department of Neurology University of Chile Santiago Chile Neurology Service Hospital del Salvador Santiago Chile Family Health Center Juan Pablo II Santiago Chile Department of Biomedicine Section on Physiology Univeristy of Bergen Bergen Norway Department of Public Health and Primary Health Care Univeristy of Bergen Bergen Norway Department of Public Health and Primary Health Care University of Bergen Bergen Norway Norwegian Competence Center for Sleep Disorders Haukeland University Hospital Bergen Norway Department of Child and Adolescent Psychiatry Haukeland University Hospital Univeristy of Bergen Bergen Norway Department of Biomedicine University of Bergen Bergen Norway US Army Medical Research and Materiel Command Fort Detrick Frederick USA Walter Reed Army Institute of Research Silver Spring USA Department of Behavioral Biology Walter Reed Army Institute of Research Silver Spring USA Faculty Department of Pulmonology Pamukkale University Medical Denizli Turkey University of Ballarat Ballarat Australia Sanofi-Aventis Recherche et Developpement Paris France Brigham and Women’s Hospital Harvard Medical School Boston USA The University of Queensland Adelaide Australia School of Psychology University of Queensland Brisbane Australia The University of Queensland Brisbane Australia Victoria University Melbourne Australia Department of Psychology Victoria University Melbourne Australia School of Psychology Victoria University Melbourne Australia Philips-Universität Marburg Germany Philips-Universitaet-Marburg Marburg Germany Instituto de Investigaciones del Sueno Madrid Spain Universitätsklinik für Neurologie Innsbruck Austria Universitaetsklinik fuer Neurologie Innsbruck Austria IMEREM GmbH Nuernberg Germany Schwarz Pharma AG Monheim Germany

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Optimizing the combination of MBSFN and PTM transmissions in LTE systems

Optimizing the combination of MBSFN and PTM transmissions in...

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10th Annual Wireless Telecommunications Symposium, WTS 2011

作者： Alexiou, Antonios Bouras, Christos Kokkinos, Vasileios Papazois, Andreas Tseliou, Georgia Research Academic Computer Technology Institute Patras Greece Computer Engineering and Informatics Dept. Univ. of Patras Greece

ISBN: (纸本)9781457701627

The 3rd Generation Partnership Project (3GPP) has introduced the evolved Multimedia Broadcast/Multicast Service (e-MBMS) feature for cellular systems as an evolution to the existing MBMS service. To support e-MBMS in Long Term Evolution (LTE) systems, 3GPP recommends the use of Point-to-Multipoint (PTM) transmissions and MBMS over a Single Frequency Network (MBSFN). MBSFN is a new feature where a time-synchronized common waveform is transmitted from multiple cells. In this paper we investigate the provision of MBMS service over a combination of MBSFN and PTM transmission methods. A cost analysis of the MBMS service is presented based on the transmission cost over all the interfaces and nodes of the LTE architecture. We evaluate the performance of this transmission scheme from telecommunication cost perspective and we compare it with other transmission schemes. The performance evaluation has been performed with the aid of a new simulation tool that estimates the cost for the MBMS provision under different network topologies, MBSFN deployments and user distributions. © 2011 IEEE.

关键词： Network topology

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Optimal Dedicated Protection Approach to Shared Risk Link Group Failures using Network Coding

Optimal Dedicated Protection Approach to Shared Risk Link Gr...

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IEEE International Conference on Communications

作者： Peter Babarczi Janos Tapolcai Pin-Han Ho Muriel Medard Dept. of Telecommunications and Media Informatics Budapest University of Technology and Economics Dept. of Electrical and Computer Engineering University of Waterloo Research Laboratory of Electronics Massachusetts Institute of Technology

ISBN: (纸本)9781457720529

Survivable routing serves as a key role in connection-oriented communication networks for achieving desired service availability for each connection. This is particularly critical for the success of all-optical mesh networks where each lightpath carries a huge amount of data. Currently, 1 + 1 dedicated path protection appears to be the most widely deployed network resilience mechanism because it offers instantaneous recovery from network failures. However, 1 + 1 protection consumes almost twice as much capacity as required, which imposes a stringent constraint on network resource utilization. In addition, finding an SRLG-disjoint path is essential for 1 + 1 protection, which is nonetheless subject to non-trivial computation complexity and may fail in some SRLG scenarios. To address these problems, we introduce a novel framework of 1 + 1 protection, called Generalized Dedicated Protection (GDP), for achieving instantaneous recovery from any SRLG failure event. It is demonstrated, that finding a non-bifurcated optimal solution for GDP is NP-complete. Thus, the paper presents a novel scheme applying Generalized Dedicated Protection and Network Coding (GDP-NC) to ensure both optimal resource utilization among dedicated protection approaches and instantaneous recovery for single unicast flows, which can be split into multiple parts in all-optical networks. We demonstrate that the proposed GDP-NC survivable routing problem is polynomial-time solvable, owing to the ability to bifurcate flows. This flexibility comes at the expense of additional hardware for linear combination operations for the optical flows.

关键词： Network coding Robustness Economic indicators Routing Optical fiber networks Unicast Bandwidth

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Optimized Path Selection Mechanism for IEEE 802.16j Multi-hop Relay Networks

Optimized Path Selection Mechanism for IEEE 802.16j Multi-ho...

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IEEE International Conference on Communications

作者： Jian-Ming Chang Chin-Feng Lai Han-Chieh Chao Jiann-Liang Chen Dept. of Computer Science Information Engineering National Dong Hwa University Inst. of Computer Science Information Engineering National Ilan University Dept. of Electrical Engineering National Taiwan University of science and Technology

ISBN: (纸本)9781457720529

When the mobile station (MS) is far away from the base station (BS) or terrain and buildings interfere with transmission, the data rate decreases with the increased distance from the BS, and the coverage range of the BS will be shortened to only a few kilometers. The IEEE Working Group has proposed the 802.16j relay technology. This technology can be used to forward data for a BS while overcoming the signal strength attenuation. Since the cost of constructing the relay station is low, the MS will have to scan more than one signal when entering the Mobile Multi-Hop Relay (MMR) network. In this paper, we introduce a novel path selection mechanism that exploits the remaining slot and signal strength indicator (SSI). Since the signal strength will affect the Modulation and Coding Scheme (MCS) combination, we propose to use SSI integrated with the MCS, taking the hop count into account. We demonstrate that our proposed scheme is capable of producing an optimal path selection.

关键词： Path selection 802.16j OFDMA Modulation and Coding Scheme (MCS)

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Power management for SVC video over wireless networks

Power management for SVC video over wireless networks

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6th International Conference on Broadband and Wireless Computing, Communication and Applications, BWCCA-2011

作者： Bouras, C. Charalambides, S. Stamos, K. Stroumpis, S. Zaoudis, G. Computer Technology Institute and Press Diophantus Patra Greece Computer Engineering and Informatics Dept. University of Patras Greece Technological Educational Institute of Patras Greece

ISBN: (纸本)9780769545325

The main idea of this paper is to study how the emerging H.264 SVC standard can be utilized for more efficient power management in wireless video transmissions. Our proposal uses a cross-layer approach which adapts the power transmission level of the sender according to the SVC information regarding the priority of the SVC NAL frame. Our aim is to improve transmission statistics, and therefore user experience, without unnecessary power consumption. We use extensive experimentation on the ns2 network simulator, which we have specifically modified for this purpose, in order to verify this approach. © 2011 IEEE.

关键词： Power management

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Normal Algorithmetic Implementation of Cellular Automata

Normal Algorithmetic Implementation of Cellular Automata

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International Conference on Computing Sciences (ICCS)

作者： G. Ramesh Chandra V. Dhana Lakshmi E.G. Rajan Department of Computer Science and Engineering VNR Vignana Jyothi Institute of Engineering and Technology Hyderabad India Dept. of Comput. Sci. & Eng. VNR Vignana Jyothi Inst. of Eng. & Technol. Hyderabad India Pentagram Research Center Private Limited Hyderabad India

Markov's Normal Algorithms are idealized sequential machines. Von Neumann's Cellular Automata are idealized parallel processing machines. This paper introduces a state-of-the-art of realizing cellular automata... 详细信息

关键词： Automata Arrays Lattices Image edge detection Automation Markov processes

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GRAL: A grouping algorithm to optimize application placement in wireless embedded systems

GRAL: A grouping algorithm to optimize application placement...

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25th IEEE International Parallel and Distributed Processing Symposium, IPDPS 2011

作者： Tziritas, Nikos Loukopoulos, Thanasis Lalis, Spyros Lampsas, Petros Center for Research and Technology Thessaly Volos Greece Dept. of Computer and Communication Engineering Univ. of Thessaly Volos Greece Dept. of Informatics and Computer Technology TEI of Lamia Lamia Greece

ISBN: (纸本)9780769543857

Recent embedded middleware initiatives enable the structuring of an application as a set of collaborating agents deployed in the various sensing/actuating entities of the system. Of particular importance is the incurred cost due to agent communication which in terms depends on agent positions in the system. In this paper we present GRAL a grouping algorithm that migrates groups of agents with the aim of minimizing communication. The algorithm works in a distributed fashion based on knowledge available locally at each node and can be used both for one-shot initial application deployment and for the continuous updating of agent placement. Through simulation experiments under various scenarios we evaluate the algorithm, comparing the solution quality reached against the optimal obtained from exhaustive search. © 2011 IEEE.

关键词： Embedded systems

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Cross-layer mechanism for efficient video transmission over mobile ad hoc networks

Cross-layer mechanism for efficient video transmission over ...

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2011 3rd International Workshop on Cross Layer Design, IWCLD 2011

作者： Adam, G. Bouras, C. Gkamas, A. Kapoulas, V. Kioumourtzis, G. Tavoularis, N. Computer Technology Institute and Press Diophantus Patras Greece Computer Engineering and Informatics Dept. Univ. of Patras Greece University Ecclesiastical Academy of Vella Ioannina Greece

ISBN: (纸本)9781457715686

Mobile ad hoc networks (MANETs) are becoming more essential to wireless communications due to growing popularity of mobile devices. However, MANETs do not seem to effectively support multimedia applications and especially video transmission. This paper presents a cross-layer mechanism for efficient video transmission over this type of networks. The proposed mechanism consists of a priority-scheduling algorithm, at the network layer, and the use of the IEEE 802.11e standard at the MAC layer. The priority-scheduling algorithm takes into account the frame type of the MPEG-4 video file in order to provide different priorities to the most important video packets. At the MAC layer, the IEEE 802.11e protocol assigns the highest priority to video applications to reduce delay and packets losses due to other competing traffic. This design is easily implemented in any ad hoc wireless network as an extension on the AODV MANET routing protocol. Simulation results conducted with the network simulator ns-2 show the advantages of the proposed design. © 2011 IEEE.

关键词： Scheduling algorithms

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