Wyniki 1-3 spośród 3 dla zapytania: authorDesc:"Azhar SAGYMBEKOVA"

AD systems for processing of low frequency signals based on self calibrate ADC and DAC with weight redundancy DOI:10.15199/48.2017.05.26

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Static and dynamic characteristics of modern AD systems of low signals processing are defined by the parameters of ADC and analog devices. Improvement of accuracy and speed of AD systems is possible due to the usage of self-correcting ADC of bitwise balancing ,based on computation n systems with weight redundancy. The ratio between the digit weights in these computation systems is 1 < α < 2. If α = 1.618 "golden ratio" соde is formed. It is shown that increasing of the accuracy and speed of ADC several times is possible due to calibration of static and autocompensation of dynamic balancing errors. Structural block diagrams of the converters for symmetric and asymmetric computation systems are given. The structure of multichannel AD system and method of self-correction of the parameters of input analog devices are developed. Method of calibration and compensation linear distortions of amplitude-frequency and phase-frequency characteristics of measuring channels is shown. The parameters of the developed multichannel AD system for seismic measurements are presented. Streszczenie. Cechy statyczne i dynamiczne nowoczesnych systemów AC do przetwarzania małych sygnałów są definiowane przez parametry przetworników AC i peryferiów analogowych. Poprawa dokładności i szybkości systemów AC jest możliwa dzięki wykorzystaniu samokorygującego przetwornika AC z bilansowaniem bitowym, na podstawie obliczeń n systemów z redundancją wagi. Współczynnik pomiędzy wagami cyfr w tych systemach obliczeniowych wynosi 1 < α < 2. Jeśli α = 1,618 sformułowany zostaje kod "złoty podział". Wykazano, że możliwe jest kilkukrotne zwiększenie dokładności i szybkości przetworników AC dzięki kalibracji statycznej i automatycznej kompensacji błędów dynamicznych. Zaprezentowano schematy blokowe konwerterów dla symetrycznych i asymetrycznych systemach obliczeniowych. Zostały opracowane struktury wielokanałowego systemu AC i sposobu samodzielnego kory[...]

Fast ray casting of function-based surfaces DOI:10.15199/48.2017.05.16

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This paper deals with the fast ray casting of high-quality images, a method of defining free forms without approximating them with polygons or patches, issues of using perturbation functions for animation of the surfaces of 3D objects. A method for visualizing functionally defined objects adapted for graphics processing units (GPU) is proposed. Streszczenie. W artykule zaprezentowano metodę rzutowania promieni wykorzystującą tzw. funkcję perturbacji zamiast aproksymacji za pomocą wieloboków w odniesieniu do obrazów wysokiej rozdzielczości w celu animacji powierzchni obiektów trójwymiarowych. Ponadto, zaproponowana została metoda wizualizacji obiektów z wykorzystaniem procesorów graficznych (GPU). (Szybkie rzutowanie powierzchni opisanych za pomocą funkcji). Keywords: geometric objects, perturbation functions, fast ray casting, graphics processing units. Słowa kluczowe: obiekty geometryczne, funkcje perturbacji, szybkie śledzenie promieni, procesory graficzne Introduction In the generation of 3D scenes, a polygonal definition of object models is most frequently used which has a number of limitations. Wireframe models of 3D objects are approximate. Increasing the realism of graphic scenes involves increasing the level of detail for correct approximation of the surfaces of objects of the real world, with the rates of increase in the geometric complexity of 3D images exceeding the growth rate of the performance of graphics tools. Achieving photorealism usually requires more than one million polygons in the scene and a trend to further increase in the level of detail is observed. The amounts of data for visualization of three-dimensional objects with complex surface are close to voxel models. Polygonal models are in principle unsuitable for obtaining many visual effects necessary for a realistic displaying of scenes. Skeletal animation cannot provide high-quality animation of flexible materials or 3D metamorphosis or morphing of objec[...]

Experimental research of turbo-codes application in telemedicine systems with wireless body area sensor networks DOI:10.15199/48.2019.04.30

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The evolution of science and technics has allowed to create a promising application of wireless sensor networks, that is called wireless body area sensor networks (WBAN). It has a huge potential for the revolutionary transformation of medical technologies [1-3]. WBAN can be used to provide assistance to automatic medical treatment, automatic dosing, and vital signal monitoring. Fig. 1 shows an intuitive view of automatic medical treatment process (closed loop control) [2]. At the first step various vital data are collected using different sensors attached to a person. These data are sent to the command unit. At the second step the command unit decides the corresponding treatment method or correct dosing based on the received vital parameters. After this the command unit sends a command to the action unit. At the third step the action unit applies the treatment or dosing to objectives. When the treatment or dosing is finished, sensors will collect updated vital data and the process enters another circulation. WBAN can provide a healthcare service in a more comfortable, convenient and economical way, than other conventional methods. WBAN provide the ability to broadcast multiple vital parameters in “online" mode, that provides an indispensable aid for people, who suffer from chronic diseases and acute attacks, allowing to react to the worsening of the disease. This is a key technology of “online" (contrast to the Holter "offline" monitoring) prevention of cardiovascular diseases (myocardial infarction or other abnormal conditions). The tumors diagnostics without biopsy may be done on the basis of the work of many miniature sensors, that can detect cancer cells. WBAN can help people with asthma by the way of monitoring airborne allergens and providing medics some "alert signals“ in real time mode. Also this technology can be integrated into the telemedicine system, that provides unobtrusive ambulatory monito[...]

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