Calin Ciufudean

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Security communication systems composed of highly reliable components may have few if any failures while undergoing heavy testing or field-usage. This paper combines (i) analysis of randomized pulse modulation schemes based on finite Markov chains with (ii) security communication systems failure as a rare event with a finite-state, discrete-parameter,(More)
An important characteristic of data transmission systems (DTS’s) is modularity. Since high transfer lines are widely used and constitute an important subclass of DTS’s , in this paper we focus on formal analysis of logic controllers for high volume transfer lines. We propose a systematic approach to model and to verify the space size of the logic(More)
Failure diagnosis in large and complex systems is a critical task. A discrete event system (DES) approach to the problem of failure diagnosis is presented in this paper. A classic solution to solve DES's diagnosis is a stochastic Petri nets. Unfortunately, the solution of a stochastic Petri net is severely restricted by the size of its underlying Markov(More)
The total harmonic distortion (THD) monitoring is an important challenge in the industrial and office building environment. The IEEE-519 and IEC 61000-3 standards limit the individual harmonics current as well as the THD for nonlinear power electronic loads. A harmonic current distortion comparative study of a classical three-phase rectifier diode (TPRD)(More)
This paper presents some IEC 61499-based solutions on modelling and implementing holons within a holonic manufacturing system. Also, an inter-holonic communication solution, based on IEC 61499 function blocks, is developed. The proposed solutions are implemented, validated and analyzed in a demonstration environment simulating a machining system. Key-Words:(More)
It is well-known the fact that the frequency-domain approach obtained by Fourier transforms (FT) can provide amplitude-frequency spectrum while losing time-related information. In non-stationary regime, some of power electronics equipment connected to grid requires time related information, which cannot be provided by FT. Using discrete wavelet transform(More)
This paper is focused on an IEC 61499 based solution for modeling and implementing some dynamic interactions between holons within a manufacturing control system. The reconfiguration capabilities of the standard are considered for managing the dynamic behavior of the holons. Key-Words: holonic manufacturing systems, IEC 61499, reconfiguration, management(More)