Proceedings of the Technical university of Sofia, 1995 -: Последно депозирани

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    Заглавие: Multilead signal preprocessing by linear transformation to derive an ECG lead where the atypical beats are enhanced: MATLAB implementation  Автор: Levkov, Chavdar; Левков, Чавдар; Mihov, Slavy Georgiev; Михов, Слави Георгиев Дата: 2008 Резюме: Suggested is an algorithm for ECG signal preprocessing for reliable detection and distinguishing of atypical beats in electrocardiograms (ECG). Derived is an optimal linear transformation from primary lead signals, which maximizes certain criterion for distinction of an atypical beat from the typical ones. This optimal transformation is ... Библиотека:
    TECHNICAL UNIVERSITY - SOFIA
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    Заглавие: Combined high-pass and power-line interference rejecter filter for ECG signal processing  Автор: Iliev, Ivo Tzvetanov; Илиев, Иво Цветанов; Tabakov, Serafim Dimitrov; Табаков, Серафим Димитров; Krasteva, Vеssela Tzvetanova; Кръстева, Весела Цветанова Дата: 2008 Резюме: In this study we introduce one alternative approach for ECG high-pass filtering and interference rejection based on the simple principle for averaging of samples N with a predefined distance between them D. FilterDxN has a comb frequency characteristic with high-pass cut-off defined by the number of samples N and zeros at the integer ratio ... Библиотека:
    TECHNICAL UNIVERSITY - SOFIA
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    Заглавие: Биодесулфуризация на въглищата. Критическа оценка  Автор: Йовчев, Милко Петров; Iovchev, Milko Petrov; Гаджанов, Петьо; Gadjanov, Petyo Дата: 2008 Резюме: A critical assessment of coals biodesulfurization technology is done as part of so called „Clean coals technologies”. A special attention is paid to both inorganic and organic sulfur presented in coals and also to desulfurizing bacteria which can be used to oxidize sulfur compounds to sulfates and to remove them by washing. It is underlined ... Библиотека:
    TECHNICAL UNIVERSITY - SOFIA
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    Заглавие: Наблюдател на скорост за „летящ” старт на асинхронен двигател управляван с честотен преобразовател  Автор: Рац, Емил; Ratz, Emil Дата: 2008 Резюме: The paper presents an original approach for rotation speed valuation of asynchronous motors driven by frequency inverters. This method is considering the conductance properties of the asynchronous motor stator winding at supply frequencies close to the rotational frequency of the machine. The analysis of the complex conductance proves that ... Библиотека:
    TECHNICAL UNIVERSITY - SOFIA
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    Заглавие: Експериментално изследване на диференциален индуктивен сензор със стъпална намотка  Автор: Гергова, Захаринка Кирилова; Gergova, Zaharinka Kirilova Дата: 2008 Резюме: The present article is a continuation of other research works of the author, related to exploring the characteristics of inductive sensors for linear displacement. Experimental study of the characteristics displacement-output voltage of differential inductive sensor has been done. The purpose of the research is confirming the qualities of ... Библиотека:
    TECHNICAL UNIVERSITY - SOFIA
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    Заглавие: Аналитично отчитане на реакцията на котвата при постояннотокови двигатели с постоянни магнити  Автор: Божилов, Ганчо Йорданов; Bojilov, Gantcho Yordanov; Иванов, Адриан Петров; Ivanov, Adrian Petrov Дата: 2008 Резюме: The Current study presents a method for analytical evaluation and determining the bias point of permanent magnets for DC motors tuned on by ferrite or rare earth magnets, which is related optimal and rational use of their volume. The elaborated analytical method allows for identifying the bias point adequate precision by evaluating the ... Библиотека:
    TECHNICAL UNIVERSITY - SOFIA
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    Заглавие: Оптимизиране на светлоразпределението на улични осветители от тип “плосък лъч”  Автор: Пачаманов, Ангел Саракинов; Pachamakov, Angel Sarakinov; Пачаманова, Десислава А.; Pachamakova, Dessislava A.; Христов, Константин; Hristov, Konstantin Дата: 2008 Резюме: This paper presents results of the mathematical modeling of the intensity distribution of a city street lighting fitting for a single row of lamp posts and a given height at which lighting fittings hang. The reflection indicatrix of the road corresponding to this particular setting is taken into consideration (at 40 kmph, a = 3,3 deg; at ... Библиотека:
    TECHNICAL UNIVERSITY - SOFIA
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    Заглавие: Оптимизиране на светлоразпределението на тунелни осветители от тип “плосък лъч”  Автор: Пачаманов, Ангел Саракинов; Pachamakov, Angel Sarakinov; Пачаманова, Десислава А.; Pachamakova, Dessislava A.; Петров, Стоян; Petrov, Stoyan Дата: 2008 Резюме: We present results of the mathematical modeling of the lower surface of intensity distribution of an asymmetrical tunnel lighting fitting. The problem is formulated as a linear program. The objective is to minimize the lighting fitting's luminous flux so as to achieve the luminance determined by the norm for a given setting of the lighting ... Библиотека:
    TECHNICAL UNIVERSITY - SOFIA
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    Заглавие: Моделиране на частични разряди в съединителна кабелна муфа за средно напрежение  Автор: Червенкова, Тодорка Вълева; Chervenkova, Todorka Valeva; Червенков, Атанас Георгиев; Chervenkov, Atanas Georgiev Дата: 2008 Резюме: Cable muff for connecting of power cable of medium voltage is considered. The cable muff must ensure linear homogeneous distribution of electrical strength in the cable. If this condition is not implemented, then in the cable insulation can be a partial discharge. The distribution of electrical strength in the cable insulation by extreme ... Библиотека:
    TECHNICAL UNIVERSITY - SOFIA
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    Заглавие: Моделиране и симулация на кабели в честотната и времевата област  Автор: Червенкова, Тодорка Вълева; Chervenkova, Todorka Valeva Дата: 2008 Резюме: The switching of semiconductor devices is the main source of electromagnetic interference (EMI) in power static converters. Fast power devices generate high levels of electromagnetic emissions in the form of high-frequency currents. These high-frequency disturbances travel and spread over the power cables. To study the influence of ... Библиотека:
    TECHNICAL UNIVERSITY - SOFIA
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    Заглавие: Еквивалентен модел на n на брой линейни произволно магнитно свързани индуктивности – обобщен линеен трансформатор без загуби  Автор: Паралиев, Мартин Любенов; Paraliev, Martin Lyubenov; Димитров, Димитър Ценев; Dimitrov, Dimiter Tsenev Дата: 2008 Резюме: Two coupled inductors equivalent model based on controlled voltage sources is very well known (using mutual inductance). Nevertheless, it has two disadvantages: in some cases the model elements do not have physical interpretation (negative inductance) and it does not comply with the general case of arbitrary number coupled elements. The aim ... Библиотека:
    TECHNICAL UNIVERSITY - SOFIA
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    Заглавие: Разпространение на солитони в предавателни линии  Автор: Червенкова, Тодорка Вълева; Chervenkova, Todorka Valeva; Червенков, Атанас Георгиев; Chervenkov, Atanas Georgiev Дата: 2008 Резюме: The propagation of solitary waves (solitons) in transmission line is investigated. The solitons are generated in the non-linear dispersion circuit. It is presented as non-linear circuit with distribution parameters, which include non-linear capacitors. The non-linear circuit consists of multiple sections (cells), which included inductance, ... Библиотека:
    TECHNICAL UNIVERSITY - SOFIA
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    Заглавие: Технологична инфраструктура на учебен процес, базирана на интегриран модел за електронно обучение  Автор: Минковска, Даниела Велева; Minkovska, Daniela Veleva Дата: 2008 Резюме: The paper presents the technological description on created integrated model for e-education. The basic methods of the creation, using and management of the teaching process and knowledge mastering are viewed, using technical and human resources and interaction between them. The conclusions are done for the proposed strategy and for her ... Библиотека:
    TECHNICAL UNIVERSITY - SOFIA
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    Заглавие: Модем за комуникации в аналогови самоорганизиращи се УКВ PMR радиомрежи  Автор: Илиев, Илия Тонев; Iliev, Ilia Tonev; Цолов, Ангел Белчев; Colov, Angel Belchev; Неделчев, Марин; Nedelchev, Marin Дата: 2008 Резюме: The paper presents a proposition and research of a communication modem in the licensed band for PMR radio networks in half-duplex mode. The modem uses PSK modulation in baseband utilizing Manchester coding. In order to icrease the noise performance, it uses diversity transmitting according to schematics (2,3) or (3,5). Theoretical equations ... Библиотека:
    TECHNICAL UNIVERSITY - SOFIA
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    Заглавие: Подобряване на компютърно томографски изображения на основата на морфологични филтри  Автор: Георгиева, Веска Младенова; Georgieva, Veska Mladenova Дата: 2008 Резюме: In the paper is presented an approach for computed tomography (CT) images enhancement when focusing on the area of the brain. It consists of the following basic stages for image processing: selecting the region of interest (ROI), changing the brightness of the selected ROI by equalization of the local histogram and contrast increasing by ... Библиотека:
    TECHNICAL UNIVERSITY - SOFIA
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    Заглавие: Проследяване на лица с адаптивен Mean-Shift алгоритъм и филтър на Калман  Автор: Муратовски, Красимир; Muratovski, Krasimir; Бумбаров, Огнян Любенов; Boumbarov, Ognian Lyubenov Дата: 2008 Резюме: This paper presents a novel approach to face detection and tracking in video sequences. Probability distribution of the color for the human skin is used as major facial feature. A 2D histogram built from the color components of the image in YCrCb color space is used as representation of the model of the human skin. Facetracking involves the ... Библиотека:
    TECHNICAL UNIVERSITY - SOFIA
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    Заглавие: Сравнение на вероятностни цветни модели за отделяне на области с кожа  Автор: Муратовски, Красимир; Muratovski, Krasimir; Бумбаров, Огнян Любенов; Boumbarov, Ognian Lyubenov; Щилянова, Диана Йорданова; Shtilyanova, Diana Yordanova Дата: 2008 Резюме: This paper presents a comparison between the possibilities of two probabilistic models to detect image areas containing human skin. The major sign used during the classification is the probability for any element to contain the color distribution of a human skin. The analyzed two probabilistic models by this paper are two- dimensional ... Библиотека:
    TECHNICAL UNIVERSITY - SOFIA
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    Заглавие: Изследване на преходните процеси и устойчивостта на алгоритъм заоптимална филтрация на DSSS сигнали  Автор: Илиев, Вася Бойков; Iliev, Vasya Boykov; Момчеджиков, Михаил Благоев; Momchedjikov, Mikhail Blagoev Дата: 2008 Резюме: The results from the number modeling of the model for correlation handling of complex signals, proposed in [1] is represented. The correlation extreme system dynamics is analyzed, also the interaction of the subsystems for tracking and synchronization. The shifts, disturbing the stability of the system are analyzed, also an estimation of ... Библиотека:
    TECHNICAL UNIVERSITY - SOFIA
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    Заглавие: Оптимална филтрация на DSSS сигнали  Автор: Илиев, Вася Бойков; Iliev, Vasya Boykov; Момчеджиков, Михаил Благоев; Momchedjikov, Mikhail Blagoev Дата: 2008 Резюме: A mathematical model of the algorithm for optical filtration, based on the DSSS signals according to the criteria for minimum of second central moment of the error is worked out. The algorithm is base of the method for correlation handling of complex signals proposed in [1]. The algorithm is worked out by complex using of the theorems for ... Библиотека:
    TECHNICAL UNIVERSITY - SOFIA
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    Заглавие: Ускоряване на навигацията в XML полуструктурирани документи с помощта нa апарата на линейната алгебра  Автор: Георгиев, Божидар Стефанов; Georgiev, Bozhidar Stefanov; Георгиева, Адриана Анри; Georgieva, Adriana Anri Дата: 2008 Резюме: Classical formalisms( relational algebra and calculus) cannot be directly used for XML tree document as query languages due to different underlying data models. An adequate theoretical mechanism is critical for creating a query languages that handle XML documents and is extremely important for their development and standardization. In this ... Библиотека:
    TECHNICAL UNIVERSITY - SOFIA

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