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2010 European Wireless Conference, EW 2010

作者： Alexiou, Antonios Bouras, Christos Papazois, Andreas Computer Engineering and Informatics Department University of Patras GR-26500 Patras Greece Research Academic Computer Technology Institute N. Kazantzaki GR-26500 Patras Greece

ISBN: (纸本)9781424459995

FEC is an error control method that can be used to augment or replace other methods for reliable data transmission. Such schemes inevitably add a constant overhead in the transmitted data. However, they are so simple as to meet a prime objective for UMTS multicast services, that is scalability to applications with thousands of receivers. This is the reason that 3GPP recommends the use of FEC for MBMS framework. In this paper, we use a probabilistic model for the multicast user distribution in the network and we define a scheme for multicast data delivery that combines FEC with traditional ARQ. It is important that our analysis is compliant with the 3GPP specifications and considers the latest advances in mobile networks. In this framework we investigate the impact of FEC use, we examine whether it is beneficial, how the optimal FEC code dimensioning varies based on the network conditions, which parameters affect the optimal FEC code selection, and how they do it. © 2010 IEEE.

关键词： Forward error correction

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Preface

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Theoretical computer Science 2011年第7期412卷 561-562页

作者： Christos Kaklamanis Martin Skutella Research Academic Computer Technology Institute and Department of Computer Engineering and Informatics University of Patras GR-26500 Rio Greece Institut für Mathematik Technische Universität Berlin D-10623 Berlin Germany

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A tensor algebraic framework for the intuitive exploration of sensory substitution spaces

A tensor algebraic framework for the intuitive exploration o...

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8th IEEE International Symposium on Intelligent Systems and informatics, SIISY 2010

作者： Csapo, Adam Baranyi, Peter Budapest University of Technology and Economics Dept. of Telecommunications and Media Informatics Budapest Hungary Computer and Automation Research Institute Budapest Hungary

ISBN: (纸本)9781424473946

We refer to channels of communication that link the user to information systems as cognitive communication channels. One especially interesting research topic related to cognitive communication channels deals with a special application called sensory substitution, when information is conveyed through a channel other than the one that is normally used for the given application. Our goal is to develop engineering systems for the remote teleoperation of robots using sensory substitution to convey feedback information in meaningful ways. Such applications could help reduce the cognitive load for the user on the one hand, and help alleviate the effect of control instabilities and hidden parameters on the other. In this paper, we present a tensor algebraic approach for the compact representation of complete sensory substitution channels. Using HOSVD, we transform our representations into canonical, orthogonal forms. Through a combination of rank-reduction and error compensation techniques, we propose an iterative and hierarchical parameter space exploration method which may help users tune the generated sensory substituted signals in a more intuitive fashion. As an application example, we present a mapping between tactile percepts and auditory parameters in order to convey the tactile experience of a robot to a remote user through sound. In order to be able to apply a wide a wide range of mathematical analysis tools - such as principal component analysis and user performance-oriented adaptivity - we demonstrate that it is possible to convert our models into HOSVD-based canonical forms. The verification of the enhanced parameter space exploration method using rank reduction and error compensation in this application remains part of our future work. ©2010 IEEE.

关键词： Principal component analysis

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Towards a numerically tractable model for the auditory substitution of tactile percepts

Towards a numerically tractable model for the auditory subst...

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International Symposium on Resilient Control Systems

ISBN: (纸本)9781424459544

We refer to channels of communication that link the user to information systems as cognitive communication channels. One especially interesting research topic related to cognitive communication channels deals with a special application called sensory substitution, when information is conveyed through a channel other than the one that is normally used for the given application. Our goal is to develop engineering systems for the remote teleoperation of robots using sensory substitution to convey feedback information in meaningful ways. Such applications could help reduce the cognitive load for the user on the one hand, and help alleviate the effect of control instabilities and hidden parameters on the other. A large part of our research deals with how to provide information on tactile percepts-otherwise inaccessible to the remote user - through sound. In this paper, we present one possible mapping between tactile percepts and auditory parameters. Through a set of controlled experiments, we show that the parameters used are meaningful and the sounds can at some level be learned by users as a substitute for tactile perception. Analyzing the error statistics of the experiments, we argue that it would be worthwhile to create a system in which the sound parameters could be locally tuned to enhance performance on a user-per-user basis. To this end, we convert the analytical descriptions of our sounds into an higher-order singular value decomposition (HOSVD) based tensor product model form. In order to be able to apply a wide range of mathematical analysis tools - such as principal component analysis and user performance-oriented adaptivity - we demonstrate that it is possible to convert our models into such canonical forms. © 2010 IEEE.

关键词： Tensors

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Convex hull manipulation does matter in LMI based observer design, a TP model transformation based optimisation

Convex hull manipulation does matter in LMI based observer d...

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作者： Gróf, Patrícia Baranyi, Péter Korondi, Péter Computer and Automation Research Institute Cognitive Informatics Research Budapest Hungary Budapest University of Technology and Economics Dept. of Telecommunications and Media Informatics Budapest Hungary Budapest University of Technology and Economics Dept. of Mechatronics Optics and Engineering Informatics Budapest Hungary

ISBN: (纸本)9789549260014

This paper deals with the topic of qLPV state-space model based control design in which LMIs are used to optimize the multi-objective control performance. In this paper we investigate how the convex hull of the polytopic model influences the state value estimation of the LMI based control design. We examine these influences through the control design of the two dimensional aeroelastic system's example. First we define various TP type polytopic model representations of a wing section whose vertices define different convex hulls. In the second step we investigate how these models lead to different performances of the state value estimation.

关键词： State space methods

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Efficient MCS selection for MBSFN transmissions over LTE networks

Efficient MCS selection for MBSFN transmissions over LTE net...

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IFIP Wireless Days, WD

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

Long Term Evolution (LTE), the next-generation network beyond 3G, is designed to support the explosion in demand for bandwidth-hungry multimedia services that are already experienced in wired networks. To support Multimedia Broadcast/Multicast Services (MBMS), LTE offers functionality to transmit MBMS over a Single Frequency Network (MBSFN), where a time-synchronized common waveform is transmitted from multiple cells for a given duration. This significantly improves the Spectral Efficiency (SE) compared to conventional MBMS operation. The achieved SE is mainly determined by the Modulation and Coding Scheme (MCS) utilized by the LTE physical layer. In this paper we propose and evaluate four approaches for the selection of the MCS that will be utilized for the transmission of the MBSFN data. The evaluation of the approaches is performed for different users' distribution and from SE perspective. Based on the SE measurement, we determine the most suitable approach for the corresponding users' distribution.

关键词： Signal to noise ratio Interference Throughput Bandwidth Topology Base stations Modulation

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Impairment aware RWA in optical networks: Over-provisioning or cross optimization?

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Journal of Networks 2010年第11期5卷 1271-1278页

作者： Christodoulopoulos, K. Kokkinos, P. Manousakis, K. Varvarigos, E.A. Computer Engineering and Informatics Department University of Patras Patras Greece Research Academic Computer Technology Institute Patras Greece

In transparent and translucent wavelength routed optical networks the signal quality degrades due to physical layer impairments while the interference among lightpaths implies that routing decisions for one lightpath affect and are affected by the decisions made for other lightpaths. To establish a lightpath for a new connection two main approaches can be used. The most common approach is to select a lightpath that has acceptable transmission quality under a worst case interference assumption, ensuring that the selected lightpath will not become infeasible due to the possible establishment of future interfering connections. This approach sacrifices candidate path space for a quick and stable lightpath selection, which is appealing from a complexity viewpoint. The second approach is to consider the current network utilization and account for the actual interference among lightpaths, performing a cross layer optimization between the network and physical layers. In this case, however, the algorithm has to check whether the establishment of the new lightpath turns infeasible some of the already established connections. The question that arises is whether the performance benefits that can be achieved through the second approach are worth the added complexity introduced by the cross-layer optimization applied. © 2010 Academy Publisher.

关键词： Fiber optic networks

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Method and application of acquiring extension classification knowledge

Method and application of acquiring extension classification...

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International Conference on Biomedical engineering and informatics

作者： Li, Xiaomei Yang, Chunyan Faculty of Computer Dept. Guangdong University of Technology Guangzhou China Research Institute of Extension Engineering Guangdong University of Technology Guangzhou China

ISBN: (纸本)9781424464968

According to extensible set theory, the definition of extension classification based on extension transformation is presented. The acquiring methods and application on extension cIassification are discussed on information element set. Through its dependent function values of information element before and after the transformation decide its extension categories and obtain the extension categories knowledge. ©2010 IEEE.

关键词： Data mining

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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 (DESE)

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

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.

关键词： Logic gates Wireless sensor networks Web services computer architecture Network topology Topology Java

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Implementing a mobile campus using MLE moodle

Implementing a mobile campus using MLE moodle

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5th International Conference on P2P, Parallel, Grid, Cloud and Internet Computing, 3PGCIC 2010

作者： Xhafa, Fatos Caballe, Santi Rustarazo, Isaac Barolli, Leonard Dept. of Languages and Informatics Systems Technical University of Catalonia Spain Dept. of Computer Science Multimedia and Telecommunication Open University of Catalonia Spain Dept. of Information and Communication Engineering Fukuoka Institute of Technology Japan

ISBN: (纸本)9780769542379

Mobile learning is considered the next step of online learning by incorporating mobility as a key requirement. Indeed, the current wide spread of mobile devices and wireless technologies brings an enormous potential to e-learning, in terms of ubiquity, pervasiveness, personalization, flexibility, and so on. For this reason, Mobile Learning is attracting significant research efforts covering a fairly variety of learning settings, from schools and universities to workplaces and cities. This research has evidenced that mobile technology can offer new opportunities for learners to learn inside and beyond the traditional instructor-oriented educational paradigm. However, mobile technologies are still in its infancy and many challenges arise. In this paper we analyze, from both learning and technological perspectives, the development of learning applications using mobile devices. To this end, proxy and proxy less architectures are considered as way to extend traditional virtual campuses with mobile clients. The objective is twofold: to access learning materials and to support learning activities. A prototype of a Virtual Campus is developed using MLE-Moodle -the Mobile Learning module of Moodle. The proposed Virtual Campus enables mobile clients to perform online learning activities and is a step towards achieving the 'anytime, anywhere' paradigm. © 2010 IEEE.

关键词： E-learning

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