The relationship between optical properties and image contrast in confocal imaging is investigated. A Monte Carlo simulation has been developed to analyze the effects of changes in scattering, index of refraction, and...
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The relationship between optical properties and image contrast in confocal imaging is investigated. A Monte Carlo simulation has been developed to analyze the effects of changes in scattering, index of refraction, and absorption in a three-layer medium. Contrast was calculated from the computed signal-to-background ratios for changes in tissue optical properties. Results show that the largest source of contrast is changes in refractive index. (C) 1996 Optical Society of America
A more complete than usual use of the argument of the identity of photons is suggested for the teaching of radiation processes at the elementary level. The argument uses the concept of 'observability', known f...
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A more complete than usual use of the argument of the identity of photons is suggested for the teaching of radiation processes at the elementary level. The argument uses the concept of 'observability', known from system theory for estimating in the quantum-mechanical and statistical contexts, of the probability of occurrence of a casual process. The introductory discussion in Section 2 explains the reasonability of learning optoelectronics in the device-applicative, physical and system-theoretic aspects, with some emphasis associated with the research interests and pedagogical views of the author.
A method that does not use numerical integration is presented for approximating the cumulative distribution of integer-valued random variables from their characteristic functions. Bounds on the approximation error are...
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A method that does not use numerical integration is presented for approximating the cumulative distribution of integer-valued random variables from their characteristic functions. Bounds on the approximation error are also given, The method is then used to compute photomultiplier counting distributions.
Describes a high-quality distance learning course in undergraduate signals and systems which is being taught at the University of Massachusetts, Dartmouth and is being shared with the University of Massachusetts, Bost...
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Describes a high-quality distance learning course in undergraduate signals and systems which is being taught at the University of Massachusetts, Dartmouth and is being shared with the University of Massachusetts, Boston. The course uses computer-assisted collaborative learning techniques over two-way compressed video. Students in this course spend most of their class time working in groups on problems or interactive demonstrations. Often, they use simulators with audio input and output. This gives students an active learning experience during the class while also sharply reducing the amount of information which must be sent in broadcast fashion through the video system. By using collaborative learning methods, the negative impact of the video system is greatly reduced in the classrooms at both ends. There are many logistical issues in designing a distance learning course using collaborative learning methods for a subject like linear systems. This paper describes the layout of a computer-assisted learning studio. It also discusses the teaching methods used. These were optimized together for maximum effectiveness of this distance learning course.
An analytic model for the performance evaluation of space-division Asynchronous Transfer Mode (ATM) switches is presented. This model assumes that the switch has a fixed capacity of m, where 12 is given. The result sh...
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A theoretical model of microwave absorption in linear dielectric (non-ferroelectric) ionic crystals that takes into account the presence of point defects was synthesized and verified using NaCl single crystals. In the...
A theoretical model of microwave absorption in linear dielectric (non-ferroelectric) ionic crystals that takes into account the presence of point defects was synthesized and verified using NaCl single crystals. In the next stage of this research, we will introduce a controlled density of dislocations into the single crystal NaCl samples and study the effect on the microwave absorption mechanisms (ionic conduction, dielectric relaxation and multi-phonon processes) both theoretically and experimentally. Qualitative outlines of this modified theory are presented. The loss factor ε’ has been measured in the dislocation-free case by a cavity resonator insertion technique and the experimental results are in good agreement with the theoretical model. We describe the sample preparation technique that will be used to produce a controlled dislocation density in single crystal samples that will also be studied in our cavity resonator insertion system.
Estimation of the distortion parameters in pattern recognition applications is addressed. This paper reports a new technique for the estimation of distortion parameters using correlation techniques with a synthetic jo...
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Estimation of the distortion parameters in pattern recognition applications is addressed. This paper reports a new technique for the estimation of distortion parameters using correlation techniques with a synthetic joint Fourier transform (JFT) correlator set-up. In particular, the degree of rotational distortion is studied with the synthesis of a composite estimation feature from a set of distorted targets. Simulation results are presented to show better estimation performance.
The mortality related to cervical cancer can be substantially reduced through early detection and treatment. However, current detection techniques, such as Pap smear and colposcopy, fail to achieve a concurrently high...
The mortality related to cervical cancer can be substantially reduced through early detection and treatment. However, current detection techniques, such as Pap smear and colposcopy, fail to achieve a concurrently high sensitivity and specificity. In vivo fluorescence spectroscopy is a technique which quickly, noninvasively and quantitatively probes the biochemical and morphological changes that occur in pre-cancerous tissue. RBF ensemble algorithms based on such spectra provide automated, and near realtime implementation of pre-cancer detection in the hands of nonexperts. The results are more reliable, direct and accurate than those achieved by either human experts or multivariate statistical algorithms.
Body surface Laplacian maps were studied from a set of unipolar potential data in healthy human subjects. The present results indicate that body surface Laplacian maps can be obtained with high reproducibility in the ...
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Body surface Laplacian maps were studied from a set of unipolar potential data in healthy human subjects. The present results indicate that body surface Laplacian maps can be obtained with high reproducibility in the human subjects studied, and can reveal detailed information regarding the underlying ventricular conduction process.
The authors have developed a multi-purpose X-window based mapping software system. This software system can be used to analyze and display body surface maps of the Laplacian electrocardiogram, potential electrocardiog...
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The authors have developed a multi-purpose X-window based mapping software system. This software system can be used to analyze and display body surface maps of the Laplacian electrocardiogram, potential electrocardiogram, electroencephalogram, etc.
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