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  Title: Sensitivity analysis of recursive spiral-like digital filters  Author: Petrova, Petrana Angelova Date: 1994 Abstract: In this paper the main elements of sensitivity analysis of recursive filters with spiral-like structure are discussed. An effective method for state space structure description is suggested. This method allows the automation of state matrix element determination. The sensitivity measures characterizing the filter structure are defined. A ... Library:

  TECHNICAL UNIVERSITY - SOFIA
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  Title: Minimum word length determination of two-dimensional digital filters  Author: Petrova, Petrana Angelova Date: 1994 Abstract: In this paper an approach for minimum word length determination guaranteeing the stability of a specified two-dimensional digital filter (TDF) is suggested. For this purpose a state-space filter description is used. The stability condition of the TDF is brought to two single-dimension stability conditions. The lower bound of the machine ... Library:

  TECHNICAL UNIVERSITY - SOFIA
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  Title: Thermodynamic properties of real working mediums for conventional artillery weapons  Author: Danov, Stanislav; Vassilev, Daniel Date: 1994 Abstract: The thermodynamic behavior of gases from the gunpowder-burning is described by the Redlich-Kwong’s equation of state, valid for real gases under high pressure and temperature. Mathematical dependencies between thermal parameters (P, T, v) and caloric parameters (u, i, cp, cv) have been obtained. That enables us to create a mathematical model ... Library:

  TECHNICAL UNIVERSITY - SOFIA
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  Title: Correlation diagrams for prognosis and optimization of semiconducting ore minerals flotation  Author: Baev, Ivan Alexandrov; Panayotov, Vladko Todorov Date: 1994 Abstract: The flotation ability of semiconducting ore minerals depends essentially on the mineral surface state end properties. It was shown in [1] that the preliminary treatment of the semiconducting minerals galena, chalcopyrite and sphalerite in gas medium (ozone) leads to a significant improvement of the flotation yield. On the other hand, the ... Library:

  TECHNICAL UNIVERSITY - SOFIA
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  Title: A convex censor product surface construction in Cad-Cam systems  Author: Dicheva, Natasha Kirilova Date: 1994 Abstract: Shape-control for geometrical objects, represented by curves and surfaces, received much attention in CAD-CAM applications in recent years.In 1984 Ferguson and Jones (1] stated the problem for convex spline curve construction as a constrained optimization problem. In [2] the problem of surface shape control is treated as a parametric network ... Library:

  TECHNICAL UNIVERSITY - SOFIA
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  Title: Adaptive observation of the volumetric mixture formation in ship's diesel engines  Author: Sotirov, Ljubomir N.; Georgiev, Vassil D. Date: 1994 Abstract: A system for adaptive observation, that is, for the identification of the unknown parameters of the volumetric mixture formation in ship’s diesel engines, with parallel estimation of the initial and current states, has been developed. It can be used the optimal design of the working procces of ship's diesel engines (SDE), and for fuller ... Library:

  TECHNICAL UNIVERSITY - SOFIA
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  Title: Adaptive observation of ship models  Author: Sotlrov, Ljubomlr N.; Stanev, Stancho I.; Vasilev, Petar I. Date: 1994 Abstract: Tests of the type "ZIG-ZAG", with remote controlled independent model have been organized to determine the dynamically characteristics of ship models. With the use of original algorithms for estimation of order, parameters and initial and current states discrete models that can be used in modeling and projecting systems for adaptive control ... Library:

  TECHNICAL UNIVERSITY - SOFIA
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  Title: Specific features of enterprise network design  Author: Asenov, Oleg D. Date: 1994 Abstract: The Enterprise networks are specific networks. They unite basic elements of network technology in original network decisions. The specific features of enterprise network design are connected with the application of inordinary approaches concerning the search for optimum decisions for network architecture. One of these approaches is the ... Library:

  TECHNICAL UNIVERSITY - SOFIA
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  Title: Structure of protocol entities in OSI architecture  Author: Tashev, Tasho D.; Hristov, Hristo R. Date: 1994 Abstract: The concept of Open Systems Interconnection (OSI) is accepted as the basis for the development and realization of the systems for the communication exchange [1). This paper presents one structural decomposition of protocol entities in OSI architecture. For this aim is provided the formalization of the basic terms of (he Reference Model (RM) ... Library:

  TECHNICAL UNIVERSITY - SOFIA
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  Title: Simulation modeling and investigation of the parallel processes communications in a multi-transputer system  Author: Egorov, Aleksei; Romansky, Radi Date: 1994 Abstract: This paper presents the results of simulation modeling organization and system parameters investigation of a multitransputer system that is managed by a message-passing operation system. The basic unit ot distributed system - processing nodes (transputer), is modeled by detailed queueing model. A SIMAN simulation model of parallel processes ... Library:

  TECHNICAL UNIVERSITY - SOFIA
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  Title: System models based on graph grammars  Author: Benes, Miroslav; Hruska, Tomis Date: 1994 Abstract: The paper dealt with graph rewriting systems a* a tool for specification and evaluation of models. Graph model of a system can be decorated with attributes, values of which can be examined in application conditions and actions connected with rules. The expressiveness together with readability of such a system specification is very high. The ... Library:

  TECHNICAL UNIVERSITY - SOFIA
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  Title: Simulation techniques and tools for stochastic discrete systems  Author: Rabova, Zdena; Janoi, Jaroslav Date: 1994 Abstract: The set of suitable basic abstractions (building blocks), that can be used for effective object-oriented description of stochastic discrete simulation models, has been developed. The models can be described using processes, events, queues, and facilities. Several random number generators and procedures for statistical data collecting from ... Library:

  TECHNICAL UNIVERSITY - SOFIA
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  Title: Some decision trees* applications  Author: Patev, Lubomir Date: 1994 Abstract: The decision trees are known as a powerful tool for modelling the decision environment. They are known mostly from some managerial applications. Many practical decision problems are sequential decision problems, so there have been numerous successful applications of decision trees for large projects. Using the decision models for solving ... Library:

  TECHNICAL UNIVERSITY - SOFIA
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  Title: Free vibrations of torsional systems for engines  Author: Pavlov, Stefan B. Date: 1994 Abstract: In this development it is been made an analysis of free torsional vibrations of internal combustion engines.The author proposes an analytical method convenient for automation of calculations with the help of a computer instead of graphical methods,existing in the literature. This method permits easy and rapid modal analysis of engines. All ... Library:

  TECHNICAL UNIVERSITY - SOFIA
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  Title: Asynchronous approach to flash analogue to digital converter design  Author: Popov, Angel; Manova, Darinka Date: 1994 Abstract: A new class of flash analogue to digital converter is discussed. The architecture of the converter is asynchronous and is based on the use of comparators working without a clock signal. Three examples of comparator circuit design techniques are presented and compared together Library:

  TECHNICAL UNIVERSITY - SOFIA
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  Title: Video analogue to digital converter testing  Author: Andreadis, I.; Tsalides, Ph. Date: 1994 Abstract: Signal processing at video rates is a demanding task. A technique for dynamic testing of video analogue to digital converters (ADCs) is presented in this paper. The technique is based on the histogram computation when a sinewave is used as the input to the ADC. This test ensures the existence or non existence of missing codes and differential ... Library:

  TECHNICAL UNIVERSITY - SOFIA
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  Title: A system for collecting and processing of information from stationary and mobile measuring device  Author: Dimitrova, Nina Date: 1994 Abstract: The system provides automatic collection, storage and data processing for the purposes of subsequent evaluation of after-effects resulted from industrial accidents and other emergency situations with discharges of high toxic, poisonous and harmful substances This evaluation is based on concrete data, received from stationary and mobile ... Library:

  TECHNICAL UNIVERSITY - SOFIA
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  Title: Adaptive observation of an electromechanical system  Author: Sotirov, L.N.; Loutskanov, K.D.; Tchanev, D.G. Date: 1994 Abstract: An original algorithm for adaptive observation (a combined identification of t e parameters and estimation of the initial and current state) of an.electromechanical system - impulse amplifier of power - DC motor The adaptive observation is made upon available information about the current speed and DC motor power supply changes. The results ... Library:

  TECHNICAL UNIVERSITY - SOFIA
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  Title: A system for tactile information processing  Author: Todorova, Velimira D.; Christov, Stephan M. Date: 1994 Abstract: A system for information processing from a tactile array sensor on the basis a non-resonance piezoelectric transformer (NRPT) with a running bulk acoustic wave и presented in this paper. The information records as a delay time between the running wave front at each moment and the exciting pulse. The input-output parameters of the tactile ... Library:

  TECHNICAL UNIVERSITY - SOFIA
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  Title: Analog interfaces for temperature sensors with application in intelligent measuring systems  Author: Shkevov, Rumen; Ivanov, Yanko; Chapkunov, Stefan Date: 1994 Abstract: In this paper the analogue interfaces for platinum resistance temperature sensors, operating as a part of an intelligent measuring system are examined The interfaces are developed with a possibility for application to extremely heavy environmental conditions An analysis is made of the measuring block as a result of the critical increase of ... Library:

  TECHNICAL UNIVERSITY - SOFIA

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