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IEEE International Symposium on Biomedical Imaging

作者： Nico Scherf Thomas Zerjatke Konstantin Klemm Ingmar Glauche Ingo Roeder Institute for Medical Informatics and Biometry Dresden University of Technology Dresden Germany Bioinformatics Group Institute for Computer Science University of Leipzig Leipzig Germany

ISBN: (纸本)9781467364560

Single cell tracking, based on the computerised analysis of time-lapse movies, is a sophisticated experimental technique to quantify single cell dynamics in time and space. Although the resulting cellular genealogies comprehensively describe the divisional history of each cell, there are many open questions regarding the statistical analysis of this type of data. In particular, it is unclear, how tracking uncertainties or spatial information of cellular development can correctly be incorporated into the analysis. Here we propose a generalised description of single cell tracking data by spatiotemporal networks that can account for ambiguities in cell assignment as well as for spatial relations between cells. We present a way to measure correlations among cell states by analysing the mutual information in state space considering causal (time-respecting) paths and illustrate our approach by a corresponding example. We conclude that a comprehensive spatiotemporal description of single cell tracking data is ultimately necessary to fully exploit the information obtained by time-lapse imaging.

关键词： computer architecture Microprocessors Mutual information Spatiotemporal phenomena Stem cells Imaging Correlation

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Guidance, Navigation, and Control of an Unmanned Hovercraft

Guidance, Navigation, and Control of an Unmanned Hovercraft

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Mediterranean Conference on Control & Automation

作者： Kilsoo Kim Young-Ki Lee Sehwan Oh David Moroniti Dimitri Mavris George J. Vachtsevanos Nikos Papamarkos George Georgoulas School of Aerospace Engineering Georgia Institute of Technology School of Electrical and Computer Engineering Georgia Institute of Technology Democritus University of Thrace KIC Laboratory Department of Informatics and Telecommunications Technology Technological Educational Institute of Epirus

ISBN: (纸本)9781479909964

This paper introduces a simulation and evaluation of guidance, navigation, and control algorithms applied to an autonomous hovercraft. A line-of-sight guidance law is adopted in conjunction with a neural network based adaptive dynamic inversion control scheme for the underactuated hovercraft following a prescribed path. The simulation result demonstrates that the guidance and control scheme can be effective in waypoint following of the underactuated hovercraft, especially, when external disturbances exist. It is also shown that the error signals are bounded using Lyapunov's direct method.

关键词： ERROR SIGNAL hovercraft Guidance Navigation and Control Standing Orders external disturbance Simulation results Guidance Neural network computer algorithms

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Finding Dependency Parsing Limits over a Large Spanish Corpus 6

Finding Dependency Parsing Limits over a Large Spanish Corpu...

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6th International Joint Conference on Natural Language Processing, IJCNLP 2013

作者： Padró, Muntsa Ballesteros, Miguel Martínez, Héctor Bohnet, Bernd Institute of Informatics Federal University of Rio Grande do Sul Porto Alegre Brazil Natural Language Processing Group Universitat Pompeu Fabra Barcelona Spain Centre for Language Technology University of Copenhaguen Denmark School of Computer Science University of Birmingham United Kingdom

ISBN: (纸本)9784990734800

This paper studies the performance of different parsers over a large Spanish treebank. The aim of this work is to assess the limitations of state-of-the-art parsers. We want to select the most appropriate parser for Subcategorization Frame acquisition, and we focus our analysis on two aspects: the accuracy drop when parsing out-of-domain data, and the performance over specific labels relevant to our task. © IJCNLP *** right reserved.

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Feedback-Based Adaptation for Improved Power Consumption

Feedback-Based Adaptation for Improved Power Consumption

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International Conference on Advanced Information Networking and Applications (AINA)

作者： Christos Bouras Vaggelis Kapoulas Kostas Stamos Nikos Tavoularis Georgios Kioumourtzis Nikos Stathopoulos Computer Engineering and Informatics Department University of Patras Patras Greece Computer Technology Institute and Press Diophantus Patras Greece Center for Security Studies Athens Greece

In this paper we present a feedback-based adaptation mechanism that adjusts the transmission power of a wireless card on commodity PCs depending on the quality of the connection. Our purpose is to manage the available power in order to achieve lower power consumption without negatively affecting the user's perception of connection quality. We based our implementation on an existing theoretical model and focused on resolving problems and removing assumptions which made it inefficient in real life implementation. The initial model manages to minimize the power consumption in networks with exactly two nodes. In this paper, we extend the model to consider the possibility of the existence of a base station, where any number of nodes can be connected. Our objectives for the base station are to minimize the power consumption and guarantee continuous connectivity for all mobile nodes. We implement the adaptation mechanism for a specific adapter with open sources drivers thus allowing necessary modifications. We conduct a number of real world experiments. The results indicate that power consumption can be significantly reduced for nodes that are either almost stationary or slowly moving (e.g. at walking speed), without any significant increase in packet loss. The results are quite important as nowadays mobile devices with limited battery life time use tethering to become base stations for other devices like in ad-hoc networks.

关键词： Base stations Packet loss Ad hoc networks Receivers Power demand Wireless communication

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Preamble design for channel estimation in OFDM/OQAM cooperative systems

Preamble design for channel estimation in OFDM/OQAM cooperat...

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10th IEEE International Symposium on Wireless Communication Systems 2013, ISWCS 2013

作者： Mavrokefalidis, Christos Kofidis, Eleftherios Rontogiannis, Athanasios Theodoridis, Sergios Computer Technology Institute and Press Diophantus Patras University Campus Patras Greece Dept. of Statistics and Insurance Science University of Piraeus Piraeus Greece Institute for Astronomy Astrophysics Space Applications and Remote Sensing National Observatory of Athens Athens Greece Dept. of Informatics and Telecommunications University of Athens Athens Greece

ISBN: (纸本)9783800735297

Preamble design for LS channel estimation in OFDM/OQAM cooperative systems is investigated in this paper. A simple but important setup is considered, consisting of a pair of single-antenna terminals (source and destination) assisted in their communication by an AF relay and following a well-established two-phase transmission protocol. The so-called sparse preamble case (i.e., pilot tones surrounded by nulls) was recently addressed and the optimal design - in the sense of minimum MSE subject to transmit energy constraints - was shown to coincide with the one for CP-OFDM, thus resulting in no performance gains from the adoption of OFDM/OQAM. In order to complete this study and exhibit the possibilities of OFDM/OQAM to outperform CPOFDM, the so-called full preamble design (i.e., with all tones carrying pilot symbols) is addressed in this paper. The results are in line with the corresponding design for single-link systems, where the interference among pilots is positively exploited to provide significant performance gains over CP-OFDM. As a byproduct, the solution for cooperative CP-OFDM is also given, through its connection to OFDM/OQAM. The presented simulation results corroborate the analysis, demonstrating superior performance over CP-OFDM for both mildly and highly frequency selective channels and at practical SNR values. © VDE Verlag GMBH.

关键词： Orthogonal frequency division multiplexing

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A hybrid approach for Arabic semantic relation extraction

A hybrid approach for Arabic semantic relation extraction

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26th International Florida Artificial Intelligence Research Society Conference, FLAIRS 2013

作者： Lahbib, Wiem Bounhas, Ibrahim Elayeb, Bilel Evrard, Fabrice Slimani, Yahya LISI Laboratory of Computer Science for Industrial Systems Carthage University Tunisia LISI Laboratory of Computer Science for Industrial Systems Higher Institute of Documentation La Manouba University Tunisia RIADI Laboratory National School of Computer Science Manouba University Tunisia Emirates College of Technology Millennium Tower Sheikh Hamdan Street Abu Dhabi United Arab Emirates Informatics Research Institute of Toulouse 02 Rue de Charles Camichel Toulouse France LISI Laboratory of Computer Science for Industrial Systems Higher Institute of Multimedia Arts of Manouba Manouba Universtity Tunisia

ISBN: (纸本)9781577356059

Information retrieval applications are essential tools to manage the huge amount of information in the Web. Ontologies have great importance in these applications. The idea here is that several data belonging to a domain of interest are represented and related semantically in the ontology, which can help to navigate, manage and reuse these data. Despite of the growing need of ontology, only few works were interested in Arabic language. Indeed, arabic texts are highly ambiguous, especially when diacritics are absent. Besides, existent works does not cover all the types of semantic relations, which are useful to structure Arabic ontologies. A lot of work has been done on cooccurrence- based techniques, which lead to over-generation. In this paper, we propose a new approach for Arabic semantic relation extraction. We use vocalized texts to reduce ambiguities and propose a new distributional approach for similarity calculus, which is compared to cooccurrence. We discuss our contribution through experimental results and propose some perspectives for future research. Copyright © 2013, Association for the Advancement of Artificial Intelligence. All rights reserved.

关键词： Ontology

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EMG based classification of basic hand movements based on time-frequency features

EMG based classification of basic hand movements based on ti...

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Mediterranean Conference on Control & Automation

作者： Christos Sapsanis George Georgoulas Anthony Tzes Department of Electrical and Computer Engineering University of Patras KIC Laboratory Department of Informatics and Telecommunications Technology Technological Educational Institute of Epirus

ISBN: (纸本)9781479909964

This paper proposes an integrated approach for the identification of daily hand movements with a view to control prosthetic members. The raw EMG signal is decomposed into Intrinsic Mode Functions (IMFs) with the use of Empirical Mode Decomposition (EMD). A number of features are extracted in time and in frequency domain. Two different dimentionality methods are tested, namely the Principal Component Analysis (PCA) technique and the RELIEF feature selection algorithm. The outputs of the dimensionality reduction stage are then fed to a linear classifier to perform the detection task. The approach was tested on a group of young individuals and the results appear promising.

关键词： Biomedical signal analysis Empirical Mode Decomposition RELIEF feature selection. Principal Component analysis Pattern classification Electromyography

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Empirical charges for chemoinformatics applications

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Journal of Cheminformatics 2014年第1期6卷 1-1页

作者： Tomáš Bouchal Radka Svobodová Vařeková Crina-Maria Ionescu Stanislav Geidl Jaroslav Koča Tomáš Raček Aleš Křenek National Centre for Biomolecular Research Faculty of Science and CEITEC - Central European Institute of Technology Masaryk University Brno 625 00 CZ Czech Republic Institute of Computer Science and Faculty of Informatics Masaryk University Brno 602 00 CZ Czech Republic

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Device View Redundancy: an adaptive low-overhead fault tolerance mechanism for many-core system

Device View Redundancy: an adaptive low-overhead fault toler...

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International Workshop on Intelligent Communication and Social Networks

作者： Wentao Jia Chunyuan Zhang Jian Fu National Key Laboratory of Parallel and Distributed Processing College of Computer National University of Defense Technology Institute for Informatics University of Amsterdam

ISBN: (纸本)9781479909735

Continued increasing of fault rate in integrate circuit makes processors more susceptible to errors, especially many-core processor. Meanwhile, most systems or applications do not need full fault coverage, which has excessive overhead. So on-demand fault tolerance is desired for these applications. In this paper, we propose an adaptive low-overhead fault tolerance mechanism for many-core system, called Device View Redundancy (DVR). It treats fault tolerance as a device that can be configured and used by application when high reliability is needed. Nevertheless, DVR exploits the idle resources for low-overhead fault tolerance, which is based on the observation that the utilization of many-core system is low due to lack of parallelism in application. Finally, the experiment shows that the performance overhead of DVR is reduced by 16% to 98% compared with full Dual Modular Redundancy (DMR).

关键词： On-demand redundancy Idle resource exploitation Dynamic coupling Low-overhead Many core system

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Improving EMG based Classification of basic hand movements using EMD

Improving EMG based Classification of basic hand movements u...

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Annual International Conference of the IEEE Engineering in Medicine and Biology Society

作者： Christos Sapsanis George Georgoulas Anthony Tzes Dimitrios Lymberopoulos Department of Electrical and Computer Engineering University of Patras KIC Laboratory Department of Informatics and Telecommunications Technology Technological Educational Institute of Epirus

ISBN: (纸本)9781457702150

This paper presents a pattern recognition approach for the identification of basic hand movements using surface electromyographic (EMG) data. The EMG signal is decomposed using Empirical Mode Decomposition (EMD) into Intrinsic Mode Functions (IMFs) and subsequently a feature extraction stage takes place. Various combinations of feature subsets are tested using a simple linear classifier for the detection task. Our results suggest that the use of EMD can increase the discrimination ability of the conventional feature sets extracted from the raw EMG signal.

关键词： Biomedical signal analysis Empirical Mode Decomposition (EMD) Pattern classification Electromyography (EMG)

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