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Performance of a self-paced brain computer interface on data contaminated with eye-movement artifacts and on data recorded in a subsequent session

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Computational Intelligence and Neuroscience 2008年第unknown期2008卷 1-13页

作者： Fatourechi, Mehrdad Ward, Rabab K. Birch, Gary E. Image and Signal Processing Laboratory Department of Electrical and Computer Engineering University of British Columbia Vancouver BC V6T 1Z4 Canada Institute for Computing Information and Cognitive Systems University of British Columbia Vancouver BC V6T 1Z4 Canada Neil Squire Society Burnaby BC V5M 3Z3 Canada

The performance of a specific self-paced BCI (SBCI) is investigated using two different datasets to determine its suitability for using online: (1) data contaminated with large-amplitude eye movements, and (2) data recorded in a session subsequent to the original sessions used to design the system. No part of the data was rejected in the subsequent session. Therefore, this dataset can be regarded as a pseudo-online test set. The SBCI under investigation uses features extracted from three specific neurological phenomena. Each of these neurological phenomena belongs to a different frequency band. Since many prominent artifacts are either of mostly low-frequency (e.g., eye movements) or mostly high-frequency nature (e.g., muscle movements), it is expected that the system shows a fairly robust performance over artifact-contaminated data. Analysis of the data of four participants using epochs contaminated with large-amplitude eye-movement artifacts shows that the system's performance deteriorates only slightly. Furthermore, the system's performance during the session subsequent to the original sessions remained largely the same as in the original sessions for three out of the four participants. This moderate drop in performance can be considered tolerable, since allowing artifact-contaminated data to be used as inputs makes the system available for users at ALL times.

关键词： .Brain computer Data Contaminated Eye-Movement Artifacts Subsequent Session Recorded in Subsequent SBCI contaminated with large-amplitude neurological phenomena

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A compositional method for the synthesis of asynchronous communication mechanisms

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28th International Conference on Applications and Theory of Petri Nets and Other Models of Concurrency

作者： Gorgonio, Kyller Cortadella, Jordi Xia, Fei Embedded Systems and Pervasive Computing Laboratory Federal University of Campina Grande Brazil Department of Software Universitat Politécnica de Catalunya Spain School of Electrical Electronic and Computer Engineering University of Newcastle Upon Tyne United Kingdom

ISBN: (纸本)9783540730934

Asynchronous data communication mechanisms (ACMs) have been extensively studied as data connectors between independently timed concurrent processes. In previous work, an automatic ACM synthesis method based on the generation of the reachability graph and the theory of regions was proposed. In this paper, we propose a new synthesis method based on the composition of Petri net modules, avoiding the exploration of the reachability graph. The behavior of ACMs is formally defined and correctness properties are specified in CTL. Model checking is used to verify the correctness of the Petri net models. The algorithms to generate the Petri net models are presented. Finally, a method to automatically generate C++ source code from the Petri net model is described.

关键词： asynchronous communication mechanisms Petri nets concurrent systems synthesis model checking protocols

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A Quantum Algorithm for Finding Minimum Exclusive-Or Expressions

A Quantum Algorithm for Finding Minimum Exclusive-Or Express...

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IEEE computer Society Annual Symposium on VLSI

作者： M. Sampson D. Voudouris G. Papakonstantinou Department of Electrical and Computer Engineering Division of Computer Science Computing Systems Laboratory National and Technical University of Athens Greece

ISBN: (纸本)9780769528960;0769528961

This paper presents a quantum algorithm for minimizing both exclusive-or sum of complex terms (ESCT) and exclusive-or sum of products (ESOP) expressions. The proposed algorithm, QMin, takes advantage of the inherent massive parallelism of quantum circuits. The ESCT expressions produced by QMin are presented in the related bibliography as an attractive architecture for implementing reversible and quantum circuits.

关键词： Quantum computing Circuits Quantum mechanics computer architecture Boolean functions computer science Input variables Minimization methods Laboratories Parallel processing

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Transfer function identification by using self-oscillations

Transfer function identification by using self-oscillations

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Mediterranean Conference on Control and Automation (MED)

作者： N. Miskovic Z. Vukic M. Barisic University of Zagreb Faculty of Electrical Engineering and Computing Department of Control and Computer Engineering Laboratory for Underwater Systems and Technologies Zagreb Croatia Faculty of Electrical Engineering and Computing University of Zagreb Laboratory for Underwater Systems and Technologies Zagreb Croatia

The work presented in this paper deals with the process of transfer function identification by using self-oscillation method (autotuning identification method). The algorithm is given in a general matrix form and some modifications are introduced. The modifications of the algorithm include augmentation of the initial algorithm for Type k systems, systems with delays and discrete-time systems. The paper also includes simulation examples which describe the introduced modifications. Apart from being rather simple, this method is applicable to real systems. Its greatest advantage is quick identification of a transfer function (depends on the system).

关键词： Transfer functions Relays Frequency Control systems Control engineering computing Delay systems Vehicle dynamics Open loop systems Delay effects Feedback

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Gain modulation dynamics of a Raman amplified WDM system using time-division multiplexed pumps

Gain modulation dynamics of a Raman amplified WDM system usi...

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International Symposium on High Capacity Optical Networks and Enabling Technologies, HONET

作者： Vineetha Kalavally Malin Premaratne Tin Win Department of Electrical and Computer Systems Engineering School of Engineering Monash University Petaling Jaya Selangor Malaysia Department of Electrical and Computer Systems Engineering Advanced Computing and Simulation Laboratory Monash University Clayton Victoria Australia

ISBN: (纸本)9781424418282

The gain modulation characteristics of an 80 nm wide, counter-pumped distributed Raman amplified WDM system has been studied when the pumps are time division multiplexed. When many optical amplifiers are employed in multi-repeater transoceanic systems, the pump is intensity modulated to obtain information about the health of the repeaters. Gain modulation dynamics referring to dynamics of pump modulation transferred to the signal is studied to help make a reasonable choice of pump wavelength for modulation and to provide power compensation if necessary from the resulting power penalty. In this paper, we study using numerical modeling, the effect of time division multiplexed pumping on the gain modulation dynamics in a WDM system. It is found that modulation transfer response is flatter and stronger across the WDM channels when the Raman amplifier pumps are time division multiplexed. The resulting increase in power penalty is determined.

关键词： Gain Modulation Time division multiplexing Stimulated emission Wavelength division multiplexing Optical fiber amplifiers Intensity modulation

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Kinematic simulative analysis of virtual potential field method for AUV trajectory planning

Kinematic simulative analysis of virtual potential field met...

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Mediterranean Conference on Control and Automation (MED)

作者： M Barisic Z. Vukic N. Miskovic Department of Computer and Control Engineering Laboratory for Underwater Systems and TechnologiesFaculty of Electrical Engineering and Computing University of Zagreb Zagreb Croatia

This paper deals with an analysis of applicability, capabilities, benefits and pitfalls of using a virtual potential field approach to autonomously planning trajectories in non-communicating autonomous underwater vehicles (AUV-s). Virtual potentials represent an approach to this problem with cross-layer design features. Examples of different layers of control that can be achieved with the same fundamental approach are: obstacle-avoidance, energy-optimal trajectories, forming up with other moving agents, controlled formation fragmentation into well-posed sub-formation etc. This paper shows, on the basis of extensive simulated experiments, that such a trajectory planner based on virtual potentials, guarantees good extendibility, scalability and performance in a hard-real-time hardware-in-the-loop system.

关键词： Kinematics Analytical models Trajectory Computational modeling computer simulation Electric variables measurement Feature extraction Stability Underwater vehicles Communication system control

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Adaptive Predictor Integration for System Performance Prediction

Adaptive Predictor Integration for System Performance Predic...

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International Symposium on Parallel and Distributed Processing (IPDPS)

作者： Jian Zhang Renato J. Figueiredo Advanced Computing and Information Systems (ACIS) Laboratory Department of Electrical and Computer Engineering University of Florida Gainesville FL USA

The integration of multiple predictors promises higher prediction accuracy than the accuracy that can be obtained with a single predictor. The challenge is how to select the best predictor at any given moment. Traditionally, multiple predictors are run in parallel and the one that generates the best result is selected for prediction. In this paper, we propose a novel approach for predictor integration based on the learning of historical predictions. It uses classification algorithms such as k-Nearest Neighbor (k-NN) based supervised learning to forecast the best predictor for the workload under study. Then only the forecasted best predictor is run for prediction. Our experimental results show that it achieved 20.18% higher best predictor forecasting accuracy than the cumulative MSB based predictor selection approach used in the popular network weather service system. In addition, it outperformed the observed most accurate single predictor in the pool for 44.23% of the performance traces.

关键词： System performance Predictive models Virtual machining Weather forecasting Bandwidth Availability Accuracy Classification algorithms Grid computing Principal component analysis

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Modeling of Light Propagation through Biological Tissues: A Novel Approach

Modeling of Light Propagation through Biological Tissues: A ...

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Frontiers in the Convergence of Bioscience and Information Technologies, FBIT

作者： Chintha C. Handapangoda Malin Premaratne Leslie Yeo James Friend Advanced Computing and Simulation Laboratory (AXL) Department of Electrical and Computer Systems Engineering Monash University Clayton VIC Australia Micro/Nanophysics Research Laboratory (MNRL) Department of Mechanical Engineering Monash University Clayton VIC Australia

An efficient numerical technique for modeling biological tissues using the radiative transfer equation is presented. Time dependence of the transient radiative transfer equation is approximated using Laguerre expansion. Azimuthal angle is discretized using the discrete ordinates method and the resulting set of ordinary differential equations is solved using the Runge-Kutta-Felhberg method.

关键词： Biological system modeling Optical propagation Biological tissues Equations Biology computing Laboratories Numerical models Azimuthal angle Optical scattering Cancer detection

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Simultaneous estimation of optical flow and object state: A modified approach to optical flow calculation

Simultaneous estimation of optical flow and object state: A ...

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IEEE International Conference on Networking, Sensing and Control

作者： Pubudu N Pathirana Allan E.K. Lim John Carminati Malin Premaratne School of Engineering and Information Technology Deakin University Geelong Australia Advanced Computing and Simulation Laboratory (AXL) Department of Electrical and Computer Systems Monash University Clayton VIC Australia

Differential optical flow methods are widely used within the computer vision community. They are classified as being either local, as in the Lucas-Kanade method, or global, as in the Horn-Schunck technique. As the physical dynamics of an object is inherently coupled into the behavior of its image in the video stream, in this paper, we use such dynamic parameter information in calculating optical flow when tracking a moving object using a video stream. Indeed, we use a modified error function in the minimization that contains physical parameter information. Further, the refined estimates of optical flow is used for better estimation of the physical parameters of the object in the simultaneous estimation of optical flow and object state(SEOS).

关键词： Image motion analysis State estimation Optical sensors Optical filters Optical noise Parameter estimation Nonlinear optics Streaming media Optical fiber networks computer vision

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Nanocomputing with probabilistic logic

Nanocomputing with probabilistic logic

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2006 6th IEEE Conference on Nanotechnology, IEEE-NANO 2006

作者： Fortes, José A. B. Advanced Computing and Information Systems Laboratory Department of Electrical and Computer Engineering University of Florida Gainesville FL United States

ISBN: (纸本)1424400783

This presentation considers the impact on logic design and computing of the fundamental unreliability of nanoscale device technologies. In general, these technologies will provide implementations of logic gates and circuits where logic levels are "0" or "1" with some probability related to the error rates of gates and interconnect. In this context, reliable circuit design becomes a problem of maximizing the probability of the correct logic levels of the output of the function implemented by the circuit for the relevant inputs. This presentation reviews some recent results and proposes new ideas for the characterization and design of probabilistic logic. Since the early days of computing it has been well known that the design of reliable arbitrary logic circuits is only possible if individual gates have error rates below some threshold which varies with gate functionality. Using bifurcation analysis of probabilistic gate models, thresholds for different types of gates are derived and their implications for logic design are revisited. Similar techniques are used to analyze multi-gate circuits and the functions they implement. The resulting thresholds provide reliability bounds for the circuits. Also considered are several proposed models for either analyzing reliability or maximizing it. Reference is also made to circuits designed to implement probabilistic computations. © 2006 IEEE.

关键词： Nanoelectronics

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