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2011 IEEE Global Telecommunications Conference - GLOBECOM 2011

作者： Peter Vingelmann Morten Videbaek Pedersen Frank H. P. Fitzek Janus Heide Department of Electronic Systems Faculty of Engineering and Science Aalborg University Denmark Department of Automation and Applied Informatics Budapest University of Technology and Economics Hungary

This paper investigates the possibility of packet error recovery in a cooperative cluster of mobile devices. We assume that these devices receive data from a broadcast transmission on their primary network interface (e.g. LTE network), and they are using a secondary network interface (e.g. ad hoc WLAN network) to form a cooperative cluster in order to exchange missing data packets among each other. Our goal is to devise a protocol that minimizes the number of packets exchanged on the secondary network whilst maximizes the number of packet errors recovered on the primary network. Moreover, we aim to repair the packet losses on-the-fly (as the data is being received), which also imposes real-time constraints on the protocol. We propose a solution based on random linear network coding to form cooperative clusters of mobile devices to facilitate the efficient exchange of information among them. We also introduce a demo application that implements this technique on Nokia phones. Then we present our testbed and the collected measurement results in order to evaluate the performance of our protocol.

关键词： Receivers Protocols Network coding Peer to peer computing Performance evaluation Mobile handsets Encoding

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Cascade Control for Telerobotic Systems Serving Space Medicine *

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IFAC Proceedings Volumes 2011年第1期44卷 3759-3764页

作者： Tamás Haidegger Levente Kovács Radu-Emil Precup Stefan Preitl Balázs Benyó Zoltán Benyó Dept. of Control Engineering and Information Technology Budapest University of Technology and Economics (BME IIT) Hungary “Politehnica” University of Timisoara Dept. of Automation and Applied Informatics Romania

Abstract Long distance teleoperation formulates a current control problem task yet to be solved, primarily due to the difficulty to compensate for signal latency. Predictive and model-based control can only give satisfying results if proper description of the system's behavior is provided. The interdisciplinary field of telesurgery has become a focal point of technology-extended medicine, where master–slave type control over large distances poses significant challenges. Innovative solutions are required to deal with the modeling human teleoperation and varying communication quality parameters. In this paper, we investigate the feasibility a more straight-forward, classical control solution based on Kessler's Extended Symmetrical Method, formulated in a cascade control approach to tackle the problems caused by latency and uncertainties in a modeled telesurgical robot system.

关键词： Teleoperation Cascade control Time-delay control Surgical robotics

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Synchronized multimedia streaming on the iPhone platform with network coding

Synchronized multimedia streaming on the iPhone platform wit...

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Consumer Communications and Networking Conference, CCNC IEEE

作者： Péter Vingelmann Frank H. P. Fitzek Morten Videbæk Pedersen Janus Heide Hassan Charaf Department of Electronic Systems University of Aalborg Denmark Department of Automation and Applied Informatics Budapest University슠of슠Technology슠and슠Economics Hungary

This paper presents the implementation of synchronized multimedia streaming for the Apple iPhone platform. The idea is to stream multimedia content from a single source to multiple receivers with direct or multi-hop connections to the source. First we look into existing solutions for video streaming on the iPhone for point-to-point architectures. After acknowledging their limitations, we propose a solution based on network coding to efficiently and reliably deliver the multimedia content to many devices in a synchronized manner. Then we introduce an application that implements this technique on the iPhone. We also present our testbed which consists of 16 iPod Touch devices to showcase the capabilities of our application.

关键词： Streaming media Receivers Media Network coding Servers Portable media players Multimedia communication

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Adapted queueing algorithms for process chains

Adapted queueing algorithms for process chains

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3rd International Conference on Intelligent Decision Technologies, IDT'2011

作者： Bogárdi-Mészöly, Ágnes Rövid, András Földesi, Péter Department of Automation and Applied Informatics Budapest University of Technology and Economics Magyar Tudösok korútja 2. Qép. 2. em. 1111 Budapest Hungary Institute of Intelligent Engineering Systems Óbuda University Bécsiút 96/B 1034 Budapest Hungary Department of Logistics and Forwarding Széchenyi István University Egyetem tér 1 9026 Gyor Hungary

ISBN: (纸本)9783642221934

Process chains are a common modeling paradigm for analysis and optimization of logistic processes, and are intensively used in many practical applications. The ProC/B toolset is a collection of software tools for modeling, analysis, validation and optimization of process chains. The ProC/B models can be translated into queueing networks or Petri nets, which can be solved by effective techniques and algorithms to evaluate performance metrics. The base queueing model with Mean-Value Analysis evaluation algorithm, and their adaptations for modeling thread pool and queue limit have been verified and validated for multi-tier software systems. The goal of our work is to adapt these models and algorithms for process chains to model parallel processes and queue limit. © 2011 Springer-Verlag Berlin Heidelberg.

关键词： Petri nets

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Identifying Unstructured Systems in the Errors-in-Variables Context

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IFAC Proceedings Volumes 2011年第1期44卷 13104-13109页

作者： Levente Hunyadi István Vajk Budapest University of Technology and Economics Department of Automation and Applied Informatics 1117 Budapest Magyar tudósok körútja 2. Hungary Phone: +36 1 463-2870 Fax: +36 1 463-2871

Abstract We present an approach to identifying static systems from noisy data where the system model is a composition of simple functions each of which can be recast into a form linear both in data and in parameters, e.g. a set of straight lines and quadratic curves in two dimensions. The proposed algorithm is an optimization method that alternates between a parametric estimation step that estimates curve or surface parameters based on a set of points and a data reassignment step that maps points to a most feasible curve or surface.

关键词： identification errors-in-variables nonlinear systems alternating optimization

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Monitoring system based on ethologically inspired human-robot communication in Intelligent Space

Monitoring system based on ethologically inspired human-robo...

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作者： Niitsuma, Mihoko Beppu, Wataru Kovács, Szilveszter Korondi, Peter Hashimoto, Hideki Dept. of Precision Mechanics Chuo University Tokyo Japan Department of Information Technology University of Miskolc Miskolc Hungary Dept. of Mechatronics Optics and Applied Informatics Budapest University of Technology and Economics Hungarian Academy of Sciences Budapest Hungary Institute of Industrial Science University of Tokyo Tokyo Japan

ISBN: (纸本)9788995605646

His paper presents a monitoring application using Intelligent Space. Intelligent Space (iSpace) is a space in which many intelligent devices, called distributed intelligent network devices (DINDs), are placed to observe the environment. Communicating with individual DINDs enable iSpace to apprehend and understand events in this space and to activate intelligent agents such as mobile robots, computer devices, and digital equipment to provide information and services to users based on observed information. Using the iSpace observation system, we can obtain multiple humans' positions and postures at the same time, even if the humans are in different places in iSpace. Therefore, in this paper we use the iSpace to monitor daily environments with the purpose of home case support. Also, we apply a mobile robot as a tool to deliver monitoring results to users. For designing human-robot communication to achieve continuous and command-free communication between a user and a mobile robot, we present an ethologically inspired human-robot communication model involving several simulations. © 2011 Asian Control Association.

关键词： Mobile robots

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Extending mobile BitTorrent environment with network coding

Extending mobile BitTorrent environment with network coding

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Consumer Communications and Networking Conference, CCNC IEEE

作者： Péter Ekler Tamás Lukovszki Jukka K. Nurminen Department of Automation and Applied Informatics Budapest University슠of슠Technology슠and슠Economics Hungary Faculity of Informatics Eötvös Lonránd University Hungary Nokia Research Center

Peer-to-peer based content sharing is considered as one of the most efficient and popular content distribution solution nowadays. However in such network it is common that parts of the content is not distributed to several peers yet, thus during the download we have to wait a lot for that rare pieces. In addition to that it is also possible that we will not be able to download the rare pieces because the original seeder has already left the network. In this paper we investigate how to increase download efficiency in BitTorrent, in case of rare pieces by using network coding methods. In mobile networks the peer connections are not so reliable, because the phones as peers can leave the network any time e.g. if the network coverage is weak. Bringing BitTorrent technology to mobile phones has already been demonstrated with the implementation of SymTorrent and MobTorrent. In this research we investigate how to extend these implementations with network coding, to increase efficiency in case of rare pieces.

关键词： Conferences

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Multi-Hop versus Overlay Networks: A Realistic Comparison Based on Energy Requirements and Latency

Multi-Hop versus Overlay Networks: A Realistic Comparison Ba...

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IEEE Conference on Vehicular technology (VTC)

作者： Frank H. P. Fitzek Janus Heide Morten V. Pedersen Gergo Ertli Marcos Katz Electronic Systems University of Aalborg Aalborg Denmark Department of Automation and Applied Informatics Budapest University슠of슠Technology슠and슠Economics Budapest Hungary Centre of Wireless Communications University of Oulu Finland

This paper compares the energy and time needed to convey one information unit from source to destination using multi hop networks versus overlay networks. For a set of realistic parameters the paper will show that multi hopping with more than 50 relays will need more time than the overlay network and with respect of energy the usage of more than 6 relays is using more energy than the overlay network. The paper underlines the importance of the idle power value for such calculations.

关键词： Relays Spread spectrum communication Energy measurement Wireless communication Performance evaluation Mobile handsets Land mobile radio cellular systems

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An adaptive tuning model for cognitive info-communication channels

An adaptive tuning model for cognitive info-communication ch...

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International Symposium on applied Machine Intelligence and informatics (SAMI)

作者： Adam Csapo Peter Baranyi Computer and Automation Research Institute Budapest Hungary Department of Telecommunications and Media Informatics Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

Cognitive infocommunication channels are abstract channels which use sensory substitution to convey structured perceptual information via any number of sensory modalities. 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, granular forms. Through a combination of rank-reduction and error compensation techniques, we propose an adaptive tuning model that can be used for iterative parameter space exploration, thus enabling users to explore the generated sensory substituted signals in a more intuitive fashion.

关键词： Tuning Tensile stress Mathematical model Robot sensing systems Equations Aerospace electronics Adaptation model

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A unified terminology for CogInfoCom applications

A unified terminology for CogInfoCom applications

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International Conference on Cognitive Infocommunications (CogInfoCom)

Due to its multidisciplinary origins, the elementary concepts and terminology of Cognitive Infocommunications (CogInfoCom) would ideally be derived - among others - from the fields of cognitive informatics, cognitive psychology, infocommunications and human-computer interaction. As the perspectives of these fields often differ considerably, a unified terminology may provide useful for research in CogInfoCom. In this paper, we propose a set of concepts which unify these various fields, as viewed from CogInfoCom. Two examples are given to illustrate how the terminology can be used to describe CogInfoCom systems.

关键词： Haptic interfaces Compounds Computational modeling Humans Audio user interfaces Visualization Computers

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