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Proceedings of the Technical university of Sofia, 1995 -: Recent submissions

Now showing items 481-500 of 853

Title: Управляемост и наблюдаемост на нелинейни системи : методът на диференциалната геометрия Author: Перев, Камен Лазаров; Иванова, Мариола Найденова; Perev, Kamen Lazarov; Ivanova, Mariola Naydenova Date: 1999 Abstract: This paper considers the problem of controllability and observability of a class nonlinear systems. A short introduction to the theory of differential geometry is presented. In the differential geometric framework is given the system description, which is nonlinear in state but linear with respect to input signals. The similarities and ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Condition and error estimates in the numerical solution of matrix equations in control theory Author: Petkov, Petko; Konstantinov, Mihail; Christov, Nicolai; Петков, Петко; Константинов, Михаил; Христов, Николай Date: 1999 Abstract: The condition number and error estimation in the numerical solution of matrix algebraic continuous-time and discrete-time Lyapunov and Riccati equations is considered. The estimates presented involve the solution of triangular Lyapunov equations along with usage of the LAPACK norm estimator. Library:
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Title: Децентрализиран подход към спецификация на услугите на интелигентна мрежа Author: Пенчева, Евелина Николова; Pencheva, Evelina Nikolova Date: 1995 Abstract: This paper presents a model of Intelligent Network (IN) services using the decentralized approach to specification of service logic and data at the level of distributed functional plane. This alternative is based on the assumption that the service logic is distributed among the Functional Entities represented as SDL processes, that are ... Library:
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Title: Централизиран подход към спецификация на услугите на интелигентна мрежа Author: Пенчева, Евелина Николова; Pencheva, Evelina Nikolova Date: 1995 Abstract: The paper presents a model of Intelligent Network (IN) services using the centralized approach to specification of service logic and data at the level of distributed functional Plane. This alternative is based on the assumption that functional entities should not be adapted to different uses in different services. The service logic is ... Library:
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Title: Изследване на оптичен сензор на промишлен робот Author: Видеков, Валентин Христов; Джамийков, Тодор Стоянов; Videkov, Valentin Hristov Date: 1995 Abstract: A manipulator for industrial robot is treated. On the manipulator it mounted an optical sensor for detection of a semiconductor substrate presence. In the paper IS presented an algorithm and results from the examination of the fuming out diagram of a forward and vertical optical sensor. Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Активни стратегии за разпознаване на форми Author: Венков, Пенчо Георгиев; Venkov, Pentcho Georgiev Date: 1999 Abstract: Some general suggestions are involved to outline the implementation of usefull algorithms for edge detection and controur segmentation in the practical vision systems. The model-based approach of analysis is compared against general passive methods of contour extraction and shape recognition. The new approach, proposed in this paper is based ... Library:
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Title: Градиентен подход за Hough трансформация на праволинейни сегменти в изображения с нива на сиво Author: Каменова, Нина Петрова; Kamenova, Nina Petrova; Венков, Пенчо Георгиев; Venkov, Pentcho Georgiev Date: 1999 Abstract: In this paper is described the developed gradient approach for Hough transform of detecting line segments in grey level images. The main idea of the offered approach consists in definig of edge points in the image, with an Sobel operator and an thresholding detector. Each of this points is mapped in a Hough space in an only one point by ... Library:
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Title: Анализ на разширеното акумулаторно пространство на Hough за опрделяне на праволинейни контурни сегменти Author: Каменова, Нина Петрова; Венков, Пенчо Георгиев; Kamenova, Nina Petrova; Venkov, Pentcho Georgiev Date: 1999 Abstract: The subject of the current paper is the detection of line segments by analyzing of the information in the expanded Hough space, resulting of the mapping of edge points in the parameter space by the gradient approach. The analysis consist of two stages procedure: in the first stage are detected local extrema by clustering of the neighbouring ... Library:
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Title: Имитационно моделиране на едноканална телетрафична система с чакане при неравномерен входящ поток Author: Мирчев, Сеферин Тодоров; Mirtchev, Seferin Todorov Date: 1995 Abstract: In this paper a simulation algorithm of the single waiting .system with constant service time, finite buffer and peaked input stream is explained. During the progress of the simulation, interarrival time is determined by random numbers and when the call terminate this interval is corrected. -It is shown that the single waiting system with ... Library:
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Title: Коаксиален датчик за пермеаметър Author: Сладкаров, Александър Маринов; Sladkarov, Alexandar Marinov Date: 1995 Abstract: In the paper an analysis of the possibility of magnetic permeability measurement of ferrite sample placed in coaxial waveguide is developed. The proper frequency range of the resonant measurement with coaxial permeameter is investigated. The requirements of the parameters of the samples and short-circuiting coaxial waveguide are obtained. Library:
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Title: Обектно – ориентиран подход за извличане на речеви параметри Author: Атанасов, Венцислав Борисов; Момчеджиков, Михаил Благоев; Momchedzhikov, Mihail Blagoev; Atanassov, Ventsislav Borissov Date: 1995 Abstract: The object-oriented approach for the implementation of an experimental system for extraction of acoustic speech parameters is discussed in the article. The article stresses the building of hierarchy of classes which serve the software system, as superstructure of standard defined classes of Object Windows library (OWL) and ClassLib in the ... Library:
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Title: Сравнителен анализ на някои методи за защита на говорна информация Author: Момчеджиков, Михаил Благоев; Ле Хай Чау; Чобански, Валентин Н.; Momchedzhikov, Mihail Blagoev; Le Hay Chau Date: 1995 Abstract: Cryptography is essential for the reliability of the radio connection. Ciphering aims at choosing a technology that will provide the desired reliability of deciphering A comparative analysis of some methods for ciphering speech information is proposed in the article. The criteria for comparing the methods are based on cryptoanalysis, ... Library:
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Title: Изследване на признаците за разпознаване на текст на монголски език Author: Бекярски, Александър Богданов; Осорин, Л.; Bekyarski, Alexandar Bogdanov; Osorin, L. Date: 1995 Abstract: Recognition of letters in mongolian alphabet is a problem the solving of which is very important for more wide applications of national alphabet in Mongolia. The mongolian letters consist of some basic figures (primares) elements. Therefor first must be made the recognition of these basic elements in mongolian words. It is proposed in this ... Library:
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Title: Алторитъм за анализ на портретни изображения с помощта на невронни мрежи с обратно разпространение на грешките / Румен Кунчев, Димитър Атанасов. (Комуникации). // Годишник на ТУ-София, Том 48, 1995, № 4. Електроника, комуникации, информатика, автоматика : Юбилейна научна сесия „50 години ТУ–София“ 11-12.10.1995 София, с. 111-118 Author: Кунчев, Румен Кирилов; Атанасов, Димитър; Kunchev, Rumen Kirilov; Atanasov, Dimitar Date: 1995 Abstract: In this paper is presented a two-stage algorithm for location of geometric visual features in human faces. The first stage generates search regions for centers of eyes and mouth from coarse-resolution image. The second stage. uses those search regions to select 12 features inside the high-resolution image data: left, right corners, top, ... Library:
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Title: Критерии за определяне зоната на действие на интермодулационните смущения при въздухоплавателните служби Author: Додов, Никола Иванов; Панков, Борислав; Dodov, Nikola Ivanov; Pankov, Borislav Date: 1995 Abstract: The present and future development of the FM sound-broadcasting networks in our country can lead to unacceptable interferences with the navigation and communication radio equipment of aeronautical services. Two kinds of interferences - these resulting from intermodulation products caused by different radio transmitters operating on common ... Library:
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Title: Gate delay model of pass - transistor logic Author: Chumachenko, Vasiliy Platonovich; Vasileva, Tanichka Krumova; Чумаченко, Василий Платонович; Василева, Таничка Крумова Date: 1995 Abstract: A simple gate delay model useful for analysis and optimization of pass-transistor logic circuit is proposed. The macromodel is based on device equation and is found to be an analytical function of capacitive. load and device sizes. Curve fitting of model equation to SPICE simulation results is used for coefficient obtaining. The procedure ... Library:
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Title: Бърз алгоритъм за определяне разпределението на параметрите на комуникационни устройства и системи Author: Ненов, Георги Димитров; Nenov, Georgi Dimitrov; Лишков, Славчо Димитров; Lishkov, Slavcho Dimitrov Date: 1995 Abstract: In this paper we introduce a fast algorithm for estimation of the distribution of output parameters of communication systems and devices. For this purpose a fraction factorization experiment is used. A decimation in observation time is achived and representativness of the data record is ensured. Library:
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Title: Компютърни радиомрежи за дистанционен контрол и управление Author: Алтимирски, Емил Савов; Altimirski, Emil Savov Date: 1995 Abstract: The paper provides information about the scientific investigations and applications in the field of computer radionetworks for remote monitoring and control of more than 2000 distant objects in electrical supply, water supply, environment protection, hydrometeorogical service, security systems, military service etc. The design and application ... Library:
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Title: Точностни характеристики на радиометричния екологичен мониторинг в инфрачервения обхват Author: Фердинандов, Ервин Стефанов; Ferdinandov, Ervin Stefanov Date: 1995 Abstract: The communication channel of a radiometric system for receiving, transmitting and processing of temperature distribution data of earth and water surfaces has been analysed of the needs of remote ecological monitoring in the infrared spectral range. Expressions have been derived for the signal - to - noise ratio and measurement resolution. ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Възможности за повишаване ефективността на силициев фотоелемент Author: Витанов, Петко Костадинов; Vitanov, Petko Kostadinov; Тютюнджиев, Николай Христов; Tyutyundzhiev, Nikolay Hristov; Каменова, Марийка Тодорова; Kamenova, Mariyka Todorova; Делибашева, Мария Христова; Delibasheva, Mariya Hristova Date: 1995 Abstract: On the top n+ — region of the standard n+p solar cell used in the experiment was formed thin porous silicon (PS) layer. The photovoltaic properties of two identical samples with and without porous silicon are compared. The tested structures are measured under solar simulated light of 100 mW/cm2. It was observed that the short circuit current ... Library:
TECHNICAL UNIVERSITY - SOFIA