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2009 4th International IEEE/EMBS Conference on Neural engineering, NER '09

作者： Ranade, Gireeja V. Ganguly, Karunesh Carmena, Jose Department of Electrical Engineering and Computer Sciences University of California Berkeley CA United States Helen Wills Neruoscience Institute University of California Berkeley CA United States Program in Cognitive Science University of California Berkeley CA United States Department of Neurology University of California San Francisco CA United States

ISBN: (纸本)9781424420735

Beta band oscillations in the local field potential (LFP) have been previously related to behavior in motor tasks. We investigated the correlations between beta oscillations and movement state for brain-machine interfaces. Two macaque monkeys were trained to perform a center-out motor task on a computer under normal movement control and under a 'brain control' paradigm, where neural firing directly controls the cursor. In both cases, LFP beta power decreased after movement onset. High beta power was predominantly observed with low movement velocity and vice versa. This observation was used to predict the stationarity of a computer cursor during brain control. ©2009 IEEE.

关键词： Interface states

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Use of a step-response approximation for thermal transient modeling in power MOSFETs

Use of a step-response approximation for thermal transient m...

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ARFTG Conference

作者： Charles Baylis Joseph Perry Matthew Moldovan Robert J. Marks Lawrence Dunleavy Wireless and Microwave Circuits and Systems Program Department of Electrical and Computer Engineering Baylor University Waco Waco TX USA Center of Wireless and Microwave Information Systems Department of Electrical Engineering University of South Florida Tampa FL USA

In a previous ARFTG paper, we presented the measurement of the thermally-induced transient drain voltage response of a power Si MOSFET to a step excitation in gate voltage. The data was fit by assuming the drain voltage takes an exponential shape. This relies on the assumption that the drain current is a step function, which is actually only approximate due to the dependence of the drain current on temperature. In this work, we show that the exponential approximation actually possesses the same asymptotic behavior of a more accurate, model-based solution we have obtained that incorporates thermal feedback. We show that the more theoretically accurate solution and exponential approximation of the solution both provide excellent fits to measured data for the Si MOSFET.

关键词： MOSFETs Temperature Time measurement Electrothermal effects Thermal resistance electrical resistance measurement Power measurement Voltage measurement Thermal engineering Power system modeling

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Center for resources in general education (CIVIS): Towards student success in general and STEM education

Center for resources in general education (CIVIS): Towards s...

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39th Annual Frontiers in Education Conference: Imagining and engineering Future CSET Education, FIE 2009

作者： O'Neill-Carrillo, Efraín Collins, Dana L. Garriga, Juan López MacChiavelli, Raúl Cruz, José A. University of Puerto Rico-Mayagüez Puerto Rico Electrical and Computer Engineering Department Puerto Rico CIVIS: Center for Resources in General Education UPRM United States Department of Humanities United States Department of Chemistry Puerto Rico Science on Wheels Program UPRM Puerto Rico College of Agricultural UPRM Puerto Rico College of Business Administration UPRM Puerto Rico

ISBN: (纸本)9781424447152

Researchers at the University of Puerto Rico-Mayaguez (UPRM) have conducted an analysis of student needs and have identified strategies to respond to the General and STEM education challenges at UPRM. A Center for Resources in General Education (CIVIS) has been established to deal with these challenges by providing students and professors a new, integrated perspective (focused on General and STEM skills) of the curriculum, and by enabling student academic success through various learning opportunities. CIVIS brings together faculty from Agricultural Sciences, Arts and Sciences, Business Administration and engineering in order to develop activities that provide interdisciplinary and global perspectives to UPRM's General Education. The Center focuses on two main activities: 1) Paths to Student Success, and 2) Sustainable Context with the use of student learning modules tying the activities together. AU initiatives of the Center are supported by a recent grant from the U.S. department of Education, and are based on the success of initiatives that have been previously tested at a smaller scale at UPRM. CIVIS provides resources to expand the reach of those initiatives and will ensure sustainability by the institutionalization of those initiatives. ©2009 IEEE.

关键词： Students

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Instantaneous rate estimation of neuronal point processes from a compressed representation of their nonbinary spike trains

Instantaneous rate estimation of neuronal point processes fr...

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Mehdi Aghagolzadeh Karim Oweiss Electrical & Computer Engineering Department Michigan State University East Lansing MI USA Neuroscience Program Michigan State University East Lansing MI USA

Estimating rate functions underlying neural point processes is essential for characterizing the firing patterns of cortical neurons involved in sensory and motor processing. This paper introduces a new method for directly estimating neuronal firing rates from a compressed representation of their extracellular recordings. The approach is based on extending a near-optimal sparse representation of the extracellular recordings to time scales matching those of the underlying rate functions, thereby performing the same role as a kernel-density estimator but at a much lower computational cost. Experimental results demonstrate that this method achieves comparable performance to the conventional Gaussian kernel estimation methods at a fraction of the computational cost. This makes it suitable to brain machine interface applications where real time decoding of neural activity for neuro-motor prosthetic control using firing rate estimates is strongly desired.

关键词： Neurons Decoding Sorting Yield estimation Kernel State estimation Neuroscience Extracellular Computational efficiency Neural prosthesis

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Identifying functional connectivity of motor neuronal ensembles improves the performance of population decoders

Identifying functional connectivity of motor neuronal ensemb...

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International IEEE/EMBS Conference on Neural engineering, CNE

作者： Mehdi Aghagolzadeh Seif Eldawlatly Karim Oweiss Department of Electrical and Computer Engineering Michigan State University East Lansing MI USA Neuroscience Program Michigan State University East Lansing MI USA

Estimating the response properties of cortical neurons is an essential step to decode movement intentions in cortically-controlled brain machine interface applications. Among these properties is the variable degree of interaction between neurons while subjects carry out similar motor tasks. In this paper, we use a dynamic model of motor encoding, previously shown to fit experimental data from primary and supplementary motor areas in nonhuman primates, to demonstrate the utility of identifying interaction patterns in improving decoding performance. Neuronal interaction is quantified by estimating the functional connectivity among neurons in a cooperative network that are driven by heterogeneously-tuned neurons in an input noncooperative network. A reward-based functional plasticity is induced in the model during repeated execution of a center-out reach task and the connectivity is continuously estimated to track changes in the interaction patterns. Results demonstrate that the ability to track cortical adaptation can contribute significantly to improvement in motor control of neuroprosthetic devices.

关键词： Decoding Neurons Bayesian methods Encoding Neural engineering Neuroscience USA Councils Application software Motor drives Neural prosthesis

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On detection with partial information in the Gaussian setup

On detection with partial information in the Gaussian setup

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Annual Allerton Conference on Communication, Control, and Computing

作者： Onur Özyeşil M. Kivanç Mihçak Yğcel Altug PACM (the Program in Applied and Computational Mathematics) Princeton University Princeton NJ USA Electrical and Electronics Engineering Department Boğaziçi University Istanbul Turkey School of Electrical and Computer Engineering Cornell University Ithaca NY USA

We introduce the problem of communication with partial information, where there is an asymmetry between the transmitter and the receiver codebooks. Practical applications of the proposed setup include the robust signal hashing problem within the context of multimedia security and asymmetric communications with resource-lacking receivers. We study this setup in a binary detection theoretic context for the additive colored Gaussian noise channel. In our proposed setup, the partial information available at the detector consists of dimensionality-reduced versions of the transmitter codewords, where the dimensionality reduction is achieved via a linear transform. We first derive the corresponding MAP-optimal detection rule and the corresponding conditional probability of error (conditioned on the partial information the detector possesses). Then, we constructively quantify an optimal class of linear transforms, where the cost function is the expected Chernoff bound on the conditional probability of error of the MAP-optimal detector.

关键词： Transmitters Protection Context Detectors Noise robustness Information security engineering profession Signal processing Privacy Bidirectional control

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Probabilistic structure from sound

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Advanced Robotics 2009年第12-13期23卷 1687-1702页

作者： Wang, Chieh-Chih Lin, Chi-Hao Hu, Jwu-Sheng Department of Computer Science and Information Engineering Graduate Institute of Networking and Multimedia National Taiwan University Taipei 10617 Taiwan Intelligent Robotics Program of Industrial Technology Research Institute Department of Electrical and Control Engineering National Chiao Tung University HsinChu 310 Taiwan

Auditory perception is one of the most important functions for robotics applications. Microphone arrays are widely used for auditory perception in which the spatial structure of microphones is usually known. In practice, microphone array calibration can be tedious and other devices or means are required. The structure from sound (SFS) approach addresses the problem of simultaneously localizing a set of microphones and a set of acoustic events that provides a great flexibility to calibrate different setups of microphone arrays. However, the existing method does not take measurement uncertainty into account and does not provide uncertainty estimates of the SFS results. In this paper, we propose a probabilistic structure from sound (PSFS) approach using the unscented transform in which the uncertainties of the PSFS results are also available. In addition, a probabilistic sound source localization approach using the PSFS results is provided to improve sound source localization accuracy. The ample results of simulation and experiments using low-cost, off-the-shelf microphones demonstrate the feasibility and performance of the proposed PSFS approach. © 2009 VSP.

关键词： Microphone array

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Modeling considerations for GaN HEMT devices

Modeling considerations for GaN HEMT devices

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IEEE Annual Conference on Wireless and Microwave Technology (WAMICON)

作者： Charles Baylis Lawrence Dunleavy Rick Connick Wireless and Microwave Circuits and Systems Program Department of Electrical and Computer Engineering Baylor University Waco TX USA Center of Wireless and Microwave Information Systems Department of Electrical Engineering University of South Florida Tampa FL USA Modelithics Inc. Tampa FL USA

The success of simulation-based design of power amplifiers for wireless communications is limited by the accuracy of nonlinear models that are used to represent the transistors. This paper provides some considerations that should be taken into account in measurement-based modeling of GaN transistors. With GaN modeling, particular attention needs to be paid to thermal and trapping issues. The use of pulsed measurements as part of the modeling process is critical to obtaining reliable GaN models. Established models such as EEHEMT, Angelov, and CFET can be successfully used in representing GaN devices.

关键词： Gallium nitride HEMTs Pulse measurements Equations Power system modeling Current measurement Power measurement Microwave devices Power amplifiers Testing

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Duty cycle dependent pulsed IV simulation and thermal time constant model fitting for LDMOS transistors

Duty cycle dependent pulsed IV simulation and thermal time c...

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ARFTG Conference

作者： Sivalingam Somasundaram Meena Charles Baylis Lawrence Dunleavy Marvin Marbell Center of Wireless and Microwave Information Systems Department of Electrical Engineering University of South Florida Tampa FL USA Wireless and Microwave Circuits and Systems Program Department of Electrical and Computer Engineering Baylor University Waco TX USA Modelithics Inc. Tampa FL USA

A pulsed simulation approach is demonstrated for prediction of duty-cycle dependent thermal effects in transistors. Also a novel method is shown for fitting and/or validating electro-thermal models using pulsed IV measurements and pulsed IV simulations. A commercial LDMOS device is used to demonstrate the new methods. After extracting the thermal time constant, good agreement is achieved between measured and simulated pulsed IV results under a wide range of different pulse conditions including DC, very short (<0.1%) duty cycles, and varied pulse widths between these extremes. A three-pole electro-thermal equivalent circuit model was shown to improve the model data fitting for intermediate pulse widths.

关键词： Pulse measurements Space vector pulse width modulation Predictive models MOSFETs Thermal resistance Heating Pulse circuits Circuit simulation computer simulation Thermal engineering

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A novel anti-collision algorithm for high-density RFID tags

A novel anti-collision algorithm for high-density RFID tags

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International Conference on electrical engineering/Electronics, computer, Telecommunications and Information Technology, ECTI-CON

作者： Sarawut Makwimanloy Piya Kovintavewat Urachada Ketprom Charturong Tantibundhit Electrical and Computer Engineering Department Thammasat University Thailand RFID Technology and Applications Research Unit Nakhon Pathom Rajabhat University Nakhon Pathom Thailand RFID Program National Electronics and Computer Technology Center Thailand

In a radio frequency identification (RFID) system, when more than one tag communicates with a reader at the same time, a collision will occur resulting in the failure of that communication. Many anti-collision algorithms, such as binary tree (BT), FSA, and DFSA have been used in ISO and EPC standards to prevent such a collision. This paper develops a new anti-collision algorithm based on the BT and the DFSA algorithms. Specifically, all tags are divided into many groups using the DSFA algorithm. Then, the tags in each group are identified using the BT algorithm. Results indicate that the proposed algorithm performs better than the existing ones in terms of the number of used time slots (the less the used time slot, the faster the algorithm).

关键词： RFID tags Radiofrequency identification Partitioning algorithms Binary trees ISO standards Application software Radio frequency Access control Animals Logistics

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