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

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Title: Homecare announcement system for people having injures Author: Iliev, Ivo Tzvetanov; Илиев, Иво Цветанов; Tabakov, Serafim Dimitrov; Табаков, Серафим Димитров Date: 2007 Abstract: The idea of applying high technology in homecare is to improve the medical services and facilitate the recovery of the patient. During the recent years, there was a rapid growth in the development of maintenance telemedicine systems and monitoring devices for patients with chronic diseases and those requiring continues telemonitoring ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Subtraction method for removing a powerline interference from ECG: case of powerline frequency deviation and non-multiple samlping Author: Mihov, Georgy Slavtchev; Михов, Георги Славчев; Ivanov, Ratcho Marinov; Иванов, Рачо Маринов; Levkov, Chavdar; Левков, Чавдар Date: 2007 Abstract: Extension of the subtraction method for removing from ECG signals a power-line interference, which deviates around rated value and non-multiple sampling rate, is proposed. A permanent criterion for finding linear segments in ECG is used and a new modification of the linear criterion is introduced that retains needed features for non-multiple ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Investigation of fir filters suitable for power-line interference extraction from ECG Author: Mihov, Georgy Slavtchev; Михов, Георги Славчев Date: 2007 Abstract: Ten non-recursive filters were investigated for power-line interference extraction from appropriate ECG segments. This extraction is a part of the subtraction procedure for interference cancellation, which is known to not affect the own signal frequency components overlapped by the interference band. The filters were tested in equal conditions ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Muscle effort degree measurement Author: Vasileva, Diyana; Василева, Дияна; Iliev, Ivo Tzvetanov; Илиев, Иво Цветанов; Dimitrov, Emil Date: 2007 Abstract: Indicating the muscle effort degree is useful to determine sensible loading of the muscle and obtain objective estimation of muscle fatigue. In this paper an effort meter for indicating the applied effort from the loading muscle is proposed and described. The developed effort meter consists of strain gauge – sensor element to detect the ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Editor for electronic notes in shared collaborative space Author: Furnadziev, Ivan Haralampiev; Фурнаджиев, Иван Харалампиев; Tchoumatchenko, Vassilii; Томашенко, Василий; Vasileva, Tania Krumova; Василева, Таня Крумова; Benmerqui, L. Date: 2007 Abstract: The IST KP-Lab project focuses on creating a Shared Space learning system aimed at facilitating innovative practices of sharing, creating and working with knowledge in education and workplaces based on trialogical learning theory. The paper outlines the design and implementation of a Note editor end-user application for document centred ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Sharepoint server 2007 deployment for electronics education Author: Shoikova, Elena Dikova; Шойкова, Елена Дикова; Ivanova, Malinka Spasova; Иванова, Малинка Спасова; Peshev, Anatoly Todorov; Пешев, Анатоли Тодоров Date: 2007 Abstract: SharePoint Server 2007 is an integrated suite of server capabilities built on top of Windows SharePoint Services and it is a solution for improving the organizational effectiveness. The portal technologies enable universities to improve the efficiency and effectiveness of different activities, including communication and collaboration, ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Some peculiarities of the e-management environment, Version 6 Author: Radonov, Rossen Ivanov; Радонов, Росен Иванов; Videkov, Valentin Hristov; Видеков, Валентин Иванов Date: 2007 Abstract: The paper presents the new capabilities of the environment for control and management of the auditorium based educational process – E-management. Since its new version 6 the environment follows the policy related to its implementation on a faculty level. The procedures for setting up and results reading are enhanced and made easier. Some ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Design of FPAA prototype for practical studying of modified van der pol equation Author: Manolov, Emil Dimitrov; Манолов, Емил Димитров; Todorov, Todor; Тодоров, Тодор; Georgiev, Zhivko Kostadinov; Георгиев, Живко Костадинов; Karagineva, Irina Laleva; Карагинева, Ирина Лалева Date: 2007 Abstract: The paper proposes and investigates FPAA prototype of sinusoidal oscillator based on the modified Van der Pol equation. Formulas for determination of basic parameters of the oscillations are presented. The proposed circuit is implemented and investigated by using AN221E04 Evaluation board of Anadigm Inc. The obtained experimental results ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Synthesis of sinewave oscillator based on the modified van der pol equation using Melnikov theory Author: Georgiev, Zhivko Kostadinov; Георгиев, Живко Костадинов; Todorov, Todor; Тодоров, Тодор; Manolov, Emil Dimitrov; Манолов, Емил Димитров; Karagineva, Irina Laleva; Карагинева, Ирина Лалева Date: 2007 Abstract: The paper presents a method for synthesis of a sinewave oscillator governed by the modified Van der Pol equation. The synthesis is based on the Melnikov theory, whereupon the generated sinusoidal oscillations have in advance assigned amplitude and frequency. A Simulink model of the oscillator is proposed and investigated. Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Application of general-purpose circuit simulators to automated design and investigation of class e power amplifiers Author: Antonova, Olga Jorova; Антонова, Олга Жорова; Hristov, Marin Hristov; Христов, Марин Христов; Gadjeva, Elissaveta Dimitrova; Гаджева, Елисавета Димитрова Date: 2007 Abstract: In the present paper an approach is proposed to computer-aided design and investigation of class E power amplifier using the possibilities of general-purpose circuit analysis programs such as PSpice. Power amplifiers performance is rated in terms of the characteristics concerning the amplifier efficiency. Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Optimization and simulation of the ekv model using matlab Author: Angelov, George; Ангелов, Георги; Asparuhova, Katya Konstantinova; Аспарухова, Катя Константинова Date: 2007 Abstract: This paper presents a parameter extraction and optimization method of an EKV model implementation in MATLAB. Open source modules provide direct access to model equations and parameters. Thus, parameters can be easily extracted and characteristics optimized for circuit design purposes. Validation against conventional BSIM3v3 model for AMS ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: An approach to automatic circuit design using generalpurpose circuit simulators Author: Mihova, Borianka Ivanova; Михова, Борянка Иванова Date: 2007 Abstract: In this work an approach to automated design of the analog circuits is developed using the standard circuit simulator OrCAD PSpice. The realization of this approach is based on the principles of analog behavioral modeling. The input data, the design conditions and limitations are described using the possibilities of the Spice input language, ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Sinusoidal and impulse generator, built on the bases of a direct digital synthezer Author: Yordanov, Aleksandar; Йорданов, Александър Date: 2007 Abstract: This paper describes a variant of sinusoidal and impulse generator, built on the bases of a direct digital synthezer. Usage of such kind of generator for testing and researches is of frequent occurrence. There are strong requirements to this generator, which are difficult to be implemented in a single device. Usually the variation in its ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Extraction of parameters of planar transformers using Author: Gadjeva, Elissaveta Dimitrova; Гаджева, Елисавета Димитрова; Durev, Vladislav Petrov; Дурев, Владислав Петров Date: 2007 Abstract: An approach for extraction the model parameters of planar transformers is proposed in the paper. The extraction is realized via the S-parameters of the corresponding models using optimization, based on Genetic Algorithm. The approach is useful in RF model design, as the S-parameters can be easily measured for a given microelectronic technology. Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Extraction of parameters of planar spiral inductors using genetic algorithms Author: Gadjeva, Elissaveta Dimitrova; Гаджева, Елисавета Димитрова; Durev, Vladislav Petrov; Дурев, Владислав Петров Date: 2007 Abstract: An approach for extraction the model parameters of spiral inductors is proposed in the paper. The extraction is realized via the S-parameters of the corresponding models using optimization, based on Genetic Algorithm. The approach is useful in RF model design, as the S-parameters can be easily measured for a given microelectronic technology. Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Improved spice macromodels of instrumentation amplifier with PSRR effects Author: Shoikova, Elena Dikova; Шойкова, Елена Дикова; Pandiev, Ivailo Milanov; Пандиев, Ивайло Миланов Date: 2007 Abstract: An improved SPICE based macromodels of monolithic instrumentation amplifiers (in-amps) is presented in which the power supply rejection ratio (PSRR) frequency effects are modelled. The simulation models are developed through modifying the existing macromodels employing the mechanism of controlled sources and subcircuits. The macromodels are ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Платформа за интелигентно пазаруване Author: Шойкова, Елена Дикова; Shoikova, Elena Dikova; Апостолов, Апостол Милчев; Apostolov, Apostol Milchev Date: 2007 Abstract: Internet, the new world communication channel, is revolutionizing our society, economics and technology development. The possibility to connect physically separated computers into a virtual network enables us to generate, exchange, share and process information as never before. The users could work together, to enrich and synchronize their ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Ефективност на електролизер с протонообменна мембрана при импулсно захранване Author: Иванов, Руслан; Ivanov, Ruslan Date: 2007 Abstract: Polymer electrolyte membrane electrolyser performance efficiency in impulse current with frequency to 500 Hz is investigated. Regression models, giving the connection between efficiency and intensity of hydrogen production of polymer electrolyte membrane electrolyser on the feeding current parameters, are proposed. Тhe analysis of the results ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Система за производство на водород с повишена ефективност Author: Иванов, Руслан; Ivanov, Ruslan Date: 2007 Abstract: Hydrogen production system powered from photovoltaic generator is developed. Algorithm for system control is developed, which allows efficient work independently of weather fluctuations. At defined photovoltaic energy fluctuations, system operation simulations are made on MATLAB software. The simulation results give us reason to consider ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Планиране и анализ на ресурсовата ефективност на производствено предприятие при внедряване на нов продукт Author: Йосифов, Йосиф; Yosifov, Yosif; Клочкова, Мила; Klochkova, Mila; Димитров, Любомир; Dimitrov, Lubomir Date: 2007 Abstract: Nowadays, the resource efficiency is a problem of a significant importance to every industrial enterprise. It incorporates the material efficiency (Material Requirements Planning I - MRP I), the material requirements planning (MRP II), and the efficiency of human resources, connected to human resource management (HRM), and to Personnel ... Library:
TECHNICAL UNIVERSITY - SOFIA