Dmitry S. Kozlov

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The paper is devoted to the derivation of a bidirectional distribution function for crystals, which specifies all outgoing rays for a ray coming to the boundary of two transparent crystalline media with different optical properties, i.e., a particular mineral, directions of optical axes if they exist, and other features. A local model of interaction based(More)
An approach to verification and validation of algorithms that render transparent objects (media) is described. Rendering of transparent optically isotropic objects has been studied extensively. However, the papers devoted to optically anisotropic objects are few in number. The main goal of the present paper is to suggest a collaboration in creating and(More)
This paper presents initial results of evaluating suitability of the conventional two-tone CW passive intermodulation (PIM) test for characterization of modulated signal distortion by passive nonlinearities in base station antennas and RF front-end. A comprehensive analysis of analog and digitally modulated waveforms in the transmission lines with weak(More)
Passive intermodulation (PIM) often limits the performance of communication systems with analog and digitally modulated signals and especially of systems supporting multiple carriers. Since the origins of the apparently multiple physical sources of nonlinearity causing PIM are not fully understood, the behavioral models are frequently used to describe the(More)
We analyzed the problem of mathematical modeling and computer simulation of nonlinear controlled dynamical systems usually described by differential-algebraic equations. The problem is proposed to be solved in the framework of the semi-empirical approach combining theoretical knowledge for the plant with training tools of artificial neural network field.(More)
This paper is devoted to the problem of photorealistic rendering of optically active crystals. Optical activity (rotation) is turning of the polarization plane of linearly polarized light while it propagates through optically active medium. Quartz is one of well-known optically active crystals. It is an optically uniaxial crystal; however, there are(More)
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