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

Now showing items 201-220 of 853

Title: FPAA prototyping of signal conditioning circuit for inductive displacement transducer Author: Koparanov, Filip Todorov; Копаранов, Филип Тодоров; Tzanov, Mihail Hristov; Цанов, Михаил Христов; Manolov, Emil Dimitrov; Манолов, Емил Димитров Date: 2008 Abstract: The paper presents the results from the design and investigation of FPAA based signal conditioning circuit for Inductive Displacement Transducer (IDT). The design utilizes Simulink behavioral model of the signal conditioning circuit based on dual half-wave rectifiers. The synthesized FPAA prototype is simulated and practically examined ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Simulink modeling of signal conditioning circuit for inductive displacement transducer Author: Tzanov, Mihail Hristov; Цанов, Михаил Христов; Koparanov, Filip Todorov; Копаранов, Филип Тодоров; Manolov, Emil Dimitrov; Манолов, Емил Димитров Date: 2008 Abstract: This paper presents the developing and examining a Simulink model of signal conditioning circuit for Inductive Displacement Transducer (IDT). To this aim the basic specifications of IDT WA200 sensor are studied and Simulink behavioral model is proposed. The two most popular methods for signal conditioning of IDT output signal are described ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Development of parameterized cell of spiral inductor using skill language Author: Grozdanov, Vladimir; Грозданов, Владимир; Pukneva, Diana; Пъкнева, Диана; Hristov, Marin; Христов, Марин Date: 2008 Abstract: In this paper is presented a method to facilitate the process of design RF circuits and systems using standard industrial CAD system CADENCE. Parameterized cell of square spiral inductor is proposed. It is created using built in Cadence language – SKILL. The use of a standard cell where the geometry parameters of the inductor can be set and ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Design and investigation of an accelerometer Author: Hristov, Marin; Христов, Марин; Veleva, Plamena; Велева, Пламена; Denishev, Krasimir; Денишев, Красимир; Grozdanov, Vladimir; Грозданов, Владимир; Gaydazhiev, Dobromir; Гайдажиев, Добромир Date: 2008 Abstract: The past few years have witnessed an increasing maturity of the MEMS industry and a rapid introduction of new products addressing applications, ranging from biochemical analysis to fiber-optic telecommunications. The market size for MEMS products has doubled in the past 5 years and is projected to grow at this fast rate for the foreseeable ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Design and simulation of accelerometer springs Author: Hristov, Marin; Христов, Марин; Toshev, Kiril; Тошев, Кирил; Denishev, Krasimir; Денишев, Красимир; Grozdanov, Vladimir; Грозданов, Владимир; Gaydazhiev, Dobromir; Гайдажиев, Добромир Date: 2008 Abstract: With the development of MicroElectroMechanicalSystems (MEMS), inertial instruments have seen significant progress over the past decades. The advantages of low-cost, low-power, small size, batch fabrication, makes MEMS-based inertial sensors have a wide range of applications in automotive, consumer, computer, and navigation markets. An ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Design and investigation of a thermal actuator Author: Hristov, Marin; Христов, Марин; Takov, Tihomir; Таков, Тихомир; Cholakova, Ivelina; Чолакова, Ивелина; Denishev, Krassimir; Денишев, Красимир; Grozdanov, Vladimir; Грозданов, Владимир; Gaydazhiev, Dobromir; Гайдажиев, Добромир Date: 2008 Abstract: Recently, there is tremendous interest in Micro Electro Mechanical Systems (MEMS) technology. MEMS refer to a collection of microsensors and actuators that can sense environment and have the ability to react to changes, with the use of a microcircuit control. Microelectromechanics have accomplished phenomenal growth over the past few years, ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Thermographic inspection of relays for railway safety equipment Author: Andonova, Anna Vladova; Андонова, Анна Владова; Ivanov, Emil; Иванов, Емил; Andreev, Andrew; Андреев, Андрей Date: 2008 Abstract: The following article presents results of the implementation of thermomonitoring methods followed up by processing of IR images. Field purpose is diagnostics of contacts wearing-out in the relays for railway safety equipment. Acceleration testing has been performed for contacts wearing-out in the relays under alternating current (AC). In ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Tool for synchronous communications in collaborative environment Author: Furnadziev, Ivan Haralampiev; Фурнаджиев, Иван Харалампиев; Tchoumatchenko, Vassiliy Platonovitch; Vasileva, Tania Krumova; Василева, Таня Крумова Date: 2008 Abstract: The paper outlines the design and implementation of end-user applications for networking and community building in shared collaborative environment. It covers features, architecture and user interface of the Chat tool, dedicated for synchronous communications in Shared Space. Chat tools aim to facilitate contextualized user communications ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Contactless thermal characterization method of switching mode power supply Author: Andonova, Anna Vladova; Андонова, Анна Владова; Tural, Ekrem; Andreev, Andrew Stefanov; Андреев, Андрей Стефанов Date: 2008 Abstract: This article presents results from the creation of switching mode power supply and non-contact thermal characterization of the separate elements that presents the risk of its reliability. Thermgraphics for several loads of different components are taken by infrared (IR) camera FLIR Р640. The developed non-contact method is realized on the ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Validation of anonymous surveys of educational subjects through their basic results Author: Videkov, Valentin Hristov; Видеков, Валентин Христов; Radonov, Rossen Ivanov; Радонов, Росен Иванов; Tsolov, Russy; Цолов, Руси Date: 2008 Abstract: The paper presents the development of an anonymous survey system using the Internet for the purposes of the System for Assessment and Maintenance of the Quality of Education (known as SOPKO) at the Technical University of Sofia. Some of the results processing functions and means for guaranteeing the process’ authenticity are described. Some ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Practical training in automotive electronics Author: Vasileva, Tania Krumova; Василева, Таня Крумова; Draganov, Vutko Aleksandrov; Драганов, Вътко Александров; Tzanov, Mihail Hristov; Цанов, Михаил Христов; Koparanov, Filip Todorov; Копаранов, Филип Тодоров; Tchoumatchenko, Vassiliy Platonovitch Date: 2008 Abstract: The increase in complexity of modern cars also increases the demands placed on diagnostics, maintenance and repair. The paper outlines the design and implementation of blended learning course for training in Automotive electronics and OBD diagnostic. Developed practical exercises with emphasis on engine performance test and OBDII diagnostic ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Methodology for teaching basic skills in PLC programming development Author: Iovev, Atanas Nikolov; Йовев, Атанас Николов; Yakimov, Peter Ivanov; Якимов, Петър Иванов; Tuliev, Nikolay Todorov; Тюлиев, Николай Тодоров; Ovcharov, Stefan Jordanov; Овчаров, Стефан Йорданов; Balkanska, Emiliya; Балканска, Емилия; Stoyanov, Eftim; Стоянов, Ефтим Date: 2008 Abstract: The teaching and training of the students in the field of Programmable Logic Controllers (PLC) is very important, because it determines the safety and the quality of control. This paper describes the various parts of the PLC and demonstrates some software for performing tasks using some of the next typical instructions: Bit Logic Instructions, ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Investigation and development of electronic instruments for plc programming training Author: Yakimov, Peter Ivanov; Якимов, Петър Иванов; Tuliev, Nikolay Todorov; Тюлиев, Николай Тодоров; Iovev, Atanas Nikolov; Йовев, Атанас Николов; Ovcharov, Stefan Jordanov; Овчаров, Стефан Йорданов; Balkanska, Emiliya; Балканска, Емилия; Mihov, Georgy Slavtchev; Михов, Георги Славчев Date: 2008 Abstract: Programmable logic controllers have been gaining popularity on the factory floor and nowadays are the most common choice for manufacturing controls. Because of the nature of a specific industrial object or manufacturing process it is impossible by reason of security the program adjustment to be performed in real conditions. Thus simulators ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: An electronic system for digitally program mable analog circuits study Author: Pandiev, Ivailo Milanov; Пандиев, Ивайло Миланов; Yakimov, Peter Ivanov; Якимов, Петър Иванов; Doychev, Doycho Dimitrov; Дойчев, Дойчо Димитров; Todorov, Todor; Тодоров, Тодор; Stanchev, Veselin; Станчев, Веселин Date: 2008 Abstract: In this paper we present a specific electronic system for analysis and design of digitally programmable analog circuits. The created electronic system is with module structure and envelops specific circuits such as programmable gain amplifiers(PGAs), attenuators, analog circuits with CMOS digital potentiometers, active filters, direct digital ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: A practical approach to design and modeling digitally programmable analog circuits Author: Pandiev, Ivailo Milanov; Пандиев, Ивайло Миланов; Yakimov, Peter Ivanov; Якимов, Петър Иванов; Dimitrov, Doycho Dimitrov; Димитров, Дойчо Димитров; Todorov, Todor; Тодоров, Тодор; Stanchev, Veselin; Станчев, Веселин Date: 2008 Abstract: In this paper, practical approaches to design and macromodeling digitally programmable analog circuits are described. The proposed design approaches are based on the design methods for analog circuits, the procedures for performing simulation projects and the general methodology for building Web-based client/server applications. Those methods ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Electronic portfolio built into windows sharepoint collaboration and learning environment Author: Shoikova, Elena Dikova; Шойкова, Елена Дикова Date: 2008 Abstract: This paper reports work-in-progress for a project to create an electronic portfolio for the Technical University-Sofia students. It outlines the components of the project being undertaken and the processes that students will experience. The paper presents the process of electronic portfolio development through five stages and its implementation ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Researching electronic portolios: educational and professional development through technology Author: Shoikova, Elena Dikova; Шойкова, Елена Дикова Date: 2008 Abstract: The use of ePortfolios in distributed learning in higher education and corporate training worldwide has increased over the last years. An ePortfolio is a highly personalized, customizable, web-based information management system, which allows students to demonstrate individual and collaborative growth, achievement, and learning over time. ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Spice simulation of the control system for frequency regulated transistor resonant inverter Author: Kunov, Georgi; Кънов, Георги Цв.; Gadjeva, Elissaveta Dimitrova; Гаджева, Елисавета Димитрова; Dimov, Todor; Димов, Тодор; Philipov, Borislav; Филипов, Борислав Date: 2008 Abstract: The paper subject of research is synthesis and SPICE simulation of a system for frequency control and regulation of series resonant transistor inverter. A characteristic feature of the system is the tracking of an only one synchronization signal. That is the current in the resonance loop. This approach is extremely preferable when the heat ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: Application of postprocessing for objective function formulation in the statistical optimization using PSPICE Author: Gadjeva, Elissaveta Dimitrova; Гаджева, Елисавета Димитрова; Shikalanov, Dimitar; Шикаланов, Димитър Date: 2008 Abstract: An approach is proposed in the paper to automated statistical circuit optimization using the general-purpose circuit analysis program Cadence PSpice. The selection of the optimal variant is based on postprocessing in the graphical amalyzer Probe. The objective functions are formulated and calculated using corresponding macrodefinitions.They ... Library:
TECHNICAL UNIVERSITY - SOFIA
Title: An approach to passive circuit synthesis using genetic algorithms in MATLAB – band-pass filter Author: Durev, Vladislav Petrov; Дурев, Владислав Петров Date: 2008 Abstract: An approach to passive circuit synthesis in MATLAB is proposed in the present paper. The Modified Nodal Analysis is used for the construction of the admittance circuit matrix. A circuit of passive band-pass filter is used for the demonstration of the method. The algorithm is easy to implement in MATLAB environment. A methodology for the ... Library:
TECHNICAL UNIVERSITY - SOFIA