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IEEE Princeton Section Sarnoff Symposium

作者： Shuangquan Wang K. Raghukumar A. Abdi J. Wallace M. Jensen New Jersey Center for Wireless Telecommunications and Center for Communications and Signal Processing Research Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA Marine Physical Laboratory Scripps Institution of Oceanography University of California San Diego San Diego CA USA Department of Electrical and Computer Engineering Brigham Young University Provo UT USA

Accurate modeling of indoor multiple-input multiple-output (MIMO) channels is an important prerequisite for multi-antenna system design. In this paper, a new model for indoor MIMO channels is proposed, and a closed-form expression for the spatio-temporal cross-correlation function between any two subchannels is derived. This new analytical correlation expression includes many key physical parameters of interest such as mean angle-of-departure at the transmitter and mean angle-of-arrival at the receiver, the associated angle spreads, the distance between transmitter and receiver, etc. in a compact form. Comparison of this model with channel correlations and capacity, using the collected indoor MIMO data, exhibits the utility of the model.

关键词： MIMO Mathematical model Scattering Radio transmitters Underwater communication Signal processing Marine technology Laboratories Closed-form solution Channel capacity

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Normal mammogram classification based on a support vector machine utilizing crossed distribution features

Normal mammogram classification based on a support vector ma...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： W. Chiracharit Y. Sun P. Kumhom K. Chamnongthai C. Babbs E.J. Delp Electronics and Telecom. Engineering Department King Mongkut's University of Technology Thonburi Bangkok Thailand Video and Image Processing Laboratory School of Electrical and Computer Engineering Purdue University IN USA Department of Basic Medical Sciences School of Veterinary Medicine Purdue University IN USA

Automatic classification of normal mammograms, which constitute a majority of screening mammograms, is a new approach to computer-aided diagnosis of breast cancer. This approach may be limited, however, by non-separable "crossed" distributions of features that are extracted from digitized mammograms. This work presents a method of mapping such non-separable input features into a new set of separable features that can be utilized, together with ordinary "uncrossed" features, by a support vector machine (SVM) classifier. The results of the proposed scheme show improved performance with 80% sensitivity and 95% specificity.

关键词： Support vector machines Support vector machine classification Training data Data mining Biomedical engineering Biomedical imaging computer aided diagnosis Breast cancer Aging Mammography

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Combining multiple segmentation algorithms and the MPEG-7 eXperimentation model in the Schema reference system

Combining multiple segmentation algorithms and the MPEG-7 eX...

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International Conference on Information Visualisation (IV)

作者： V. Mezaris H. Doulaverakis R.M.B. de Otalora S. Herrmann I. Kompatsiaris M.G. Strintzis Informatics and Telematics Institute (ITI) Centre for Research and Technology Hellas Thessaloniki Greece Information Processing Laboratory Electrical and Computer Engineering Department Aristotle University of Thessaloniki Thessaloniki Greece Institute for Integrated Systems Munich University of Technology Munich Germany

The SCHEMA Network of Excellence aims to bring together a critical mass of universities, research centers, industrial partners and end users, in order to design a reference system for content-based semantic scene analysis, interpretation and understanding. In this paper, advances in the development of the SCHEMA reference system are reported, focusing on the application of region-based image retrieval using automatic segmentation. More specifically, the integration of four segmentation algorithms and the MPEG-7 eXperimentation Model with the reference system are discussed, along with the motivation behind these and various other choices that were made during the development of the reference system. Experimental results for this system, as well as results for an earlier version of it employing proprietary descriptors, are shown using a common collection of images. Comparative evaluation of these versions, both in terms of retrieval accuracy and in terms of time-efficiency, allows the evaluation of the reference system as a whole as well as the evaluation of the usability of different components integrated with it, such as the MPEG-7 eXperimentation Model. These results illustrate the efficiency of the proposed system, as well as its suitability in serving as a test-bed for evaluating and comparing different algorithms and approaches pertaining to the content-based and semantic manipulation of visual information.

关键词： MPEG 7 Standard Image retrieval Image segmentation Content based retrieval Information retrieval Image analysis Information processing Laboratories computer networks Design engineering

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Heart rate variability analysis of effect of nicotine using periodograms

Heart rate variability analysis of effect of nicotine using ...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： T. Thong I.O. Yung D.P. Zajdel R.M. Ellingson J. McNames M. Aboy B.S. Oken Department of Biomedical Engineering Oregon Health and Sciences University Beaverton OR USA School of Medicine Oregon Health and Sciences University Portland OR USA Department of Neurology Oregon Health and Sciences University Portland OR USA Biomedical Signal Processing Laboratory Electrical and Computer Engineering Portland State University Portland OR USA

Heart rate variability (HRV) is frequently used to measure autonomic nervous system (ANS) activity. However, little is known about the mechanism underlying pharmacologically induced changes in HRV. Previous research has shown that nicotine exposure stimulates the ANS, mediating a wide spectrum of physiological and behavioral effects, including altered respiratory sinus arrhythmia and enhanced arousal and attention. Using Lomb-Welch periodograms, the effect of nicotine on the ANS in 14 nicotine-naive human subjects are studied. Results showed an increase in the low frequency (LF) to high frequency (HF) ratio with little change in mean heart rate. Results suggest that nicotine affects both sympathetic and parasympathetic reactivities and that the LF/HF best characterizes early ANS activated nicotine changes in HRV. The Lomb-Welch periodogram of the HRV is also compared to the conventional interpolated Welch periodogram. The attenuation of the high frequency components due to interpolation of the non-uniform R-R intervals is found to be a function of the power of the high frequency components, increasing with increasing power. Thus analyses using Welch periodograms that make use of the high frequency components may yield erroneous results.

关键词： Heart rate Heart rate variability Sampling methods Interpolation Biomedical engineering Autonomic nervous system Neurotransmitters Spectral analysis Mesh generation Fourier transforms

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A novel statistical model for simulation of arterial and intracranial pressure

A novel statistical model for simulation of arterial and int...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： M. Aboy J. McNames R. Hornero T. Thong D. Cuesta D. Novak B. Goldstein Signal Theory and Communicatións Department ETSI-Telecomunicacion University of Vigo Spain Biomedical Signal Processing Laboratory Electrical and Computer Engineering Portland State University Portland USA Biomedical Engineering Department/Pediatrics Department Oregon Health and Sciences University Portland USA ETS-Alcoi Polytechnic University of Valencia Spain Department of Cybernetics Czech Technical University Czech Republic

We describe a novel statistical model of pressure signals that incorporates the effects of respiration on arterial (ABP) and intracranial pressure (ICP). This model can be used to synthesize pulsatile ABP and ICP signals with similar time, frequency, and variability characteristics of real pressure signals. These synthetic signals can be used during the development, simulation, or quantitative assessment of biomedical algorithms in a variety of applications.

关键词： Cranial pressure Signal processing algorithms Signal processing Pulse modulation Amplitude modulation Biomedical engineering Testing Availability Detection algorithms Parameter estimation

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Using handheld devices for real-time wireless teleconsultation

Using handheld devices for real-time wireless teleconsultati...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： K.A. Banitsas P. Georgiadis S. Tachakra D. Cavouras Department of Electrical and Computer Engineering Brunei University West London UK Medical Image and Signal Processing Laboratory Technological Educational Institute of Athens Athens Greece A&E Department North West London Hospitals NHS Trust Central Middlesex Hospital Central Middlesex Hospital London UK London UK

Recent advances in the hardware of handheld devices, opened up the way for newer applications in the healthcare sector, and more specifically, in the teleconsultation field. Out of these devices, this paper focuses on the services that personal digital assistants and smartphones can provide to improve the speed, quality and ease of delivering a medical opinion from a distance and laying the ground for an all-wireless hospital. In that manner, PDAs were used to wirelessly support the viewing of digital imaging and communication in medicine (DICOM) images and to allow for mobile videoconferencing while within the hospital. Smartphones were also used to carry still images, multiframes and live video outside the hospital. Both of these applications aimed at increasing the mobility of the consultant while improving the healthcare service.

关键词： Handheld computers Hospitals Personal digital assistants Medical services Wireless LAN Biomedical imaging Personnel Mobile handsets Smart phones Application software

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Power spectral density estimation and tracking nonstationary pressure signals based on Kalman filtering

Power spectral density estimation and tracking nonstationary...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： M. Aboy J. McNames O.W. Marquez R. Hornero T. Thong B. Goldstein Signal Theory and Communications Dept ETSI-Telecomunicacion University of Vigo Spain Biomedical Signal Processing Laboratory Electrical and Computer Engineering Portland State University Portland USA Signal Theory and Communications Department ETSI-Telecomunicación University of Valladolid Spain Biomedical Engineering Department Oregon Health and Sciences University Portland USA Pediatrics Department Oregon Health and Sciences University Portland USA

We describe an algorithm to estimate and track slow changes in power spectral density (PSD) of nonstationary pressure signals. The algorithm is based on a Kalman filter that adaptively generates an estimate of the autoregressive model parameters at each time instant. The algorithm exhibits superior PSD tracking performance in nonstationary pressure signals than classical nonparametric methodologies, and does not assume a piecewise stationary model of the data. Furthermore, it provides better time-frequency resolution, and is robust to model mismatches. We demonstrate its usefulness by a sample application involving PSD estimation and tracking of short records of simulated pressure waveforms. This algorithm is intended for applications were the PSD must be estimated and tracked during short transient periods, possibly after clinical interventions.

关键词： Kalman filters Signal resolution Signal processing Frequency estimation Signal processing algorithms Signal analysis Filtering Biomedical engineering Autocorrelation Transient analysis

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Corrections to “Design of Two-Dimensional Recursive Filters Using Genetic Algorithms”

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IEEE Transactions on Circuits and Systems I: Regular Papers 2004年第12期51卷 2516-2516页

作者： N.E. Mastorakis I.F. Gonos M.N.S. Swamy Department of Computer Science Hellenic Naval Academy Military Institutions of University Education Piraeus Greece High Voltage Laboratory of Athens National and Technical University of Athens Athens Greece Center for Signal Processing and Communications Department of Electrical and Computer Engineering Concordia University Montreal QUE Canada

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Some imaging properties of an optical heterodyne scanning image processor

Some imaging properties of an optical heterodyne scanning im...

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Frontiers in Optics, FiO 2003

作者： Poon, Ting-Chung Optical Image Processing Laboratory Department of Electrical and Computer Engineering Virginia Tech BlacksburgVA24061 United States

ISBN: (纸本)1557527598

We present some of the imaging properties of an optical heterodyne scanning image processor. The image processor is a two-pupil optical system capably of three-dimensional (3-D) imaging coherently or incoherently, depending on the detection scheme used. We will then discuss optical scanning holography (OSH) through the development of the two-pupil optical heterodyne scanning image processor. Last, we illustrate some important 3-D example in OSH and show that two reconstructions can be obtained corresponding to the real and pseudoscopic reconstructions of a conventional hologram. © 2003 Optical Society of America

关键词： Scanning

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Improved speaker verification through probabilistic subspace adaptation 8

Improved speaker verification through probabilistic subspace...

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8th European Conference on Speech Communication and Technology, EUROSPEECH 2003

作者： Lucey, Simon Chen, Tsuhan Advanced Multimedia Processing Laboratory Department of Electrical and Computer Engineering Carnegie Mellon University PittsburghPA15213 United States

In this paper we propose a new adaptation technique for improved text-independent speaker verification with limited amounts of training data using Gaussian mixture models (GMMs). The technique, referred to as probabilistic subspace adaptation (PSA), employs a probabilistic subspace description of how a client?s parametric representation (i.e. GMM) is allowed to vary. Our technique is compared to traditional maximum a posteriori (MAP) adaptation, or relevance adaptation (RA), and maximum likelihood eigen-decomposition (MLED), or subspace adaptation (SA) techniques. Results are given on a subset of the XM2VTS databases for the task of textindependent speaker verification.

关键词： Maximum likelihood

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