Between two engineering ages: Of information and complex systems, professional research is based on a team work! Alexandru Serbanescu; Adrian-Viorel Diaconu; Cornel Ioana; Angela Digulescu Electronics, Computers and Artificial Intelligence (ECAI), 2015 7th International Conference on
Year: 2015
Pages: P-1 – P-4, DOI: 10.1109/ECAI.2015.7301136
Referenced in:
IEEE Conference Publications
From twenty years we promote the idea that engineering’s systems (and not only!) are nonlinear ones and usually can have chaotically behaviors and their associated processes need special studies’ methods. In this paper we present two directions from our research: cryptography based on chaos and a new method to analyze signals from nonlinear dynamical systems. View more
Water hammer effect characterization using an acoustic signal processing approach Angela Digulescu; Ion Candel; Cornel Ioana; Gabriel Vasile; Georgiana Dunca; Diana Maria Bucur; Alexandru Serbanescu 2015 9th International Symposium on Advanced Topics in Electrical Engineering (ATEE)
Year: 2015
Pages: 5 – 8, DOI: 10.1109/ATEE.2015.7133666
Referenced in:
IEEE Conference Publications
The paper presents an acoustic signal processing approach for the surveillance of a water pipe and the characterization of the water hammer effect. The experiment is based on ultrasonic transceivers and the validation is made with pressure sensors. The major objective is to quantify the pressure variation into the pipe using a non-intrusive method. Therefore, the speed of the transient was determi… View more
A flexible architecture for Industrial Control System honeypots Alexandru Vlad Serbanescu; Sebastian Obermeier; Der-Yeuan Yu 2015 12th International Joint Conference on e-Business and Telecommunications (ICETE)
Year: 2015, Volume: 04
Pages: 16 – 26
Referenced in:
IEEE Conference Publications
While frequent reports on targeted attacks for Industrial Control Systems hit the news, the amount of untargeted attacks using standardized industrial protocols is still unclear, especially if devices are mistakenly or even knowingly connected to the Internet. To lay the foundation for a deeper insight into the interest of potential attackers, a large scale honeynet system that captures all intera… View more
On the vortex parameter estimation using wide band signals in active acoustic system Angela Digulescu; Teodor Petrut; Ion Candel; Florentina Bunea; Georgiana Dunca; Diana Bucur; Cornel Ioana; Alexandru Serbanescu OCEANS 2014 – TAIPEI
Year: 2014
Pages: 1 – 5, DOI: 10.1109/OCEANS-TAIPEI.2014.6964552
Referenced in:
IEEE Conference Publications
This paper proposes a new method for detection of the vortex presence in fluid flow based on an active acoustic system. The experiment that validates the theory was done on a reduced scale facility using ultrasonic transceivers. The main objective was to highlight the effect of a cavitation vortex on an applied wide band signal. In order to accomplish that, the Recurrence Plot Analysis (RPA) was i… View more
Advanced signal processing techniques for detection and localization of electrical arcs Angela Digulescu; Teodor Petrut; Cindy Bernard; Ion Candel; Cornel Ioana; Alexandru Serbanescu Communications (COMM), 2014 10th International Conference on
Year: 2014
Pages: 1 – 4, DOI: 10.1109/ICComm.2014.6866749
Referenced in:
IEEE Conference Publications
This paper presents several methods applied for the detection and localization of electrical arcs measured while survelling photovoltaic power systems. Firstly, we proposed the use of energy detectors for transients (spectrogram and wavelet) and compared them with statistical methods (Maximum Likelihood Estimation (MLE)), classical signal processing methods (Matched Filter, Zero Crossing), but not… View more
Modulation detection in wireless sensor networks using recurrence plot analysis A. Digulescu; E. T. Celik; A. Serbanescu; O. Fratu; S. Halunga Wireless Personal Multimedia Communications (WPMC), 2013 16th International Symposium on
Year: 2013
Pages: 1 – 5
Referenced in:
IEEE Conference Publications
Modulation detection, one of the most important functions of a receiver in a communication system, is an intermediary step between its signal detection and demodulation. In this paper, we present the use of the recurrence plot analysis method (RPA) used for the detection of the modulation technique used for a wireless sensor network (WSN). We show a technique for the RPA method to detect ASK, FSK,… View more
Fetal heart rate variability study with recurrence plot analysis Bogdan Hurezeanu; G. Mihaela Ungureanu; Angela Digulescu; Alexandru Serbanescu; Hariton Costin; Rodica Strungaru E-Health and Bioengineering Conference (EHB), 2013
Year: 2013
Pages: 1 – 4, DOI: 10.1109/EHB.2013.6707310
Referenced in:
IEEE Conference Publications
The fetal heart rate (FHR) is a fundamental tool for clinical monitoring, when investigating the wellbeing of the fetus. The detection of the QRS complex of the fetal electrocardiogram using the abdominal signal enables the non-invasive evaluation of the FHR. There are many clinical causes for FHR variability, but a slight variance indicates a good evolution of the pregnancy. The current study eva… View more
Overview of our recent results in signal analysis using recurrence plots Alexandru Serbanescu; Florin-Marian Birleanu; Angela Digulescu Electronics, Computers and Artificial Intelligence (ECAI), 2013 International Conference on
Year: 2013
Pages: 1 – 6, DOI: 10.1109/ECAI.2013.6636179
Referenced in:
IEEE Conference Publications
This paper highlights the main results of our research in the field of recurrence plot analysis in the last five years. It briefly discusses results in the study of the method itself, as well as in some applications of it, i.e. characterization of speech signals, detection and localization of partial discharges in electric cables, representation of transient signals, estimation of signal parameter… View more
A vector approach to transient signal processing Florin-Marian Birleanu; Ion Candel; Cornel Ioana; Cedric Gervaise; Alexandru Serbanescu; Gheorghe Serban Information Science, Signal Processing and their Applications (ISSPA), 2012 11th International Conference on
Year: 2012
Pages: 1141 – 1146, DOI: 10.1109/ISSPA.2012.6310462
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Cited by: Papers (6) | Patents (1)
IEEE Conference Publications
The detection and characterization of burst signals are challenging tasks for time-frequency analysis, due to their very short duration. This paper investigates in this context the recurrence plot analysis (RPA) method, from which it derives the vector samples processing (VeSP) concept. The paper shows that VeSP is a generic framework that unifies signal processing concepts like histogram and auto… View more
Optimization of partial discharge detection in high voltage cables based on advanced signal processing techniques Ion Candel; Angela Digulescu; Cornel Ioana; Alexandru Serbanescu; Emil Sofron Information Science, Signal Processing and their Applications (ISSPA), 2012 11th International Conference on
Year: 2012
Pages: 1278 – 1282, DOI: 10.1109/ISSPA.2012.6310489
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Cited by: Papers (3)
IEEE Conference Publications
In this paper we approach the challenges of partial discharges (PD) detection in high voltage cables using signal processing techniques based on time frequency methods combined with Recurrence Plot Analysis (RPA) and high order spectrum analysis (HOSA). Detection of PD poses many problems in terms of speed of calculation, selection criteria and multitude of causes which lead to the occurrence of P… View more
A time-distributed phase space histogram for detecting transient signals Florin-Marian Birleanu; Cornel Ioana; Alexandru Serbanescu; Jocelyn Chanussot 2011 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)
Year: 2011
Pages: 3844 – 3847, DOI: 10.1109/ICASSP.2011.5947190
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Cited by: Papers (2)
IEEE Conference Publications
Burst-type signals constitute an important class of transient signals, being used especially in the investigation of various physical environments by electric or acoustic means. An important issue in the analysis of this type of signals is their detection in time. In this paper, we propose a detection method that is based on the histogram of the phase space distributed over time. The method consis… View more
On the Blind Estimation of Chip Time of Time-Hopping Signals Through Minimization of a Multimodal Cost Function Mihai Ionut Stanciu; Stéphane Azou; Alexandru Serbanescu IEEE Transactions on Signal Processing
Year: 2011, Volume: 59, Issue: 2
Pages: 842 – 847, DOI: 10.1109/TSP.2010.2090872
Referenced in:
Cited by: Papers (5)
IEEE Journals & Magazines
In this correspondence, we focus on blind estimation of the chip duration of time-hopping signals by introducing a cost function based on time-of-arrival (ToA) folding over multiple observation sets. An optimization algorithm that takes advantage of the highly oscillatory behavior in the nearby of the global minimum is proposed and a performance bound for the chip time estimate is derived. The per… View more
On the recurrence plot analysis method behaviour under scaling transform F. -M. Birleanu; C. Ioana; C. Gervaise; J. Chanussot; A. Serbanescu; G. Serban 2011 IEEE Statistical Signal Processing Workshop (SSP)
Year: 2011
Pages: 789 – 792, DOI: 10.1109/SSP.2011.5967823
Referenced in:
Cited by: Papers (6)
IEEE Conference Publications
In the last decade, the applications of the recurrence plot analysis method make it a valuable alternative to the time-frequency and time-scale tools. As it was initially developed for the study of dynamical systems, and was later used in nonlinear time series analysis, the question of using it as a signal processing tool has not been put into discussion yet. In this field the projective technique… View more
Time-frequency-phase tracking approach : Application to underwater signals in a passive context Cornel Ioana; Jerome I. Mars; Alexandru Serbanescu; Srdjan Stankovic 2010 IEEE International Conference on Acoustics, Speech and Signal Processing
Year: 2010
Pages: 5634 – 5637, DOI: 10.1109/ICASSP.2010.5495259
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Cited by: Papers (7)
IEEE Conference Publications
One of the most challenging applications of time-frequency representations deals with the analysis of the signal issued from natural environment. Recently, the interest for passive underwater context increased, basically due to the rich information carried out by the natural signals. Taken into account the non-linear multi-component time-frequency behavior of such signals, their analysis is a comp… View more
Systemic approach explored in the context of passive target tracking F. Totir; C. Ioana; A. Serbanescu; J. Stopin; L. Anton; S. Stankovic IET Signal Processing
Year: 2010, Volume: 4, Issue: 3
Pages: 314 – 323, DOI: 10.1049/iet-spr.2009.0043
Referenced in:
IET Journals & Magazines
For obvious reasons of cost, discretion and reliability costs, locating and tracking aerial targets under an electromagnetically completely passive paradigm, relying exclusively on illuminators of opportunity, is very appealing not only for military but also for civilian tasks. Such a passive radar system could exploit signals emitted by existing commercial television or radio stations or even sat… View more
Estimation of thermo-hydrodynamic parameters in energy production systems using non-stationary signal processing F. -M. Birleanu; C. Ioana; A. Serbanescu; G. Serban; E. Sofron 2010 Conference Record of the Forty Fourth Asilomar Conference on Signals, Systems and Computers
Year: 2010
Pages: 1353 – 1356, DOI: 10.1109/ACSSC.2010.5757753
Referenced in:
IEEE Conference Publications
In order to control water flow in power generation systems, obtaining precise information about the parameters of the flow is important. The construction of such systems, as well as the operating conditions, impose the use of non-intrusive techniques. The use of ultrasounds allows solving this problem in a simple and elegant manner. The technique consists in sending a signal to be affected by the … View more
Applications of nonlinear time-series analysis in unstable periodic orbits identification Cosmin Ivan; Alexandru Serbanescu Control and Communications, 2009. SIBCON 2009. International Siberian Conference on
Year: 2009
Pages: 93 – 99, DOI: 10.1109/SIBCON.2009.5044835
Referenced in:
Cited by: Papers (1)
IEEE Conference Publications
Recently, there has been an extensive interest in research on the analysis and control of chaotic behavior in nonlinear systems. Various control problems can be defined for such systems, such as targeting the trajectories to a desired point, stabilizing unstable periodic orbits etc. The recurrence plot is a two dimensional representation technique that brings out distance correlations in a time se… View more
Applications of nonlinear time-series analysis in unstable periodic orbits identification – Chaos control in buck converter Cosmin Ivan; Alexandru Serbanescu Signals, Circuits and Systems, 2009. ISSCS 2009. International Symposium on
Year: 2009
Pages: 1 – 4, DOI: 10.1109/ISSCS.2009.5206146
Referenced in:
Cited by: Papers (1)
IEEE Conference Publications
Recently, there has been an extensive interest in research on the analysis and control of chaotic behavior in nonlinear systems. Various control problems can be defined for such systems, such as targeting the trajectories to a desired point, stabilizing unstable periodic orbits etc. The recurrence plot is a two dimensional representation technique that brings out distance correlations in a time se… View more
Control methods on unstable periodic orbits of a chaotic dynamical system — control chaos in buck converter Cosmin Ivan; Alexandru Serbanescu Optimization of Electrical and Electronic Equipment, 2008. OPTIM 2008. 11th International Conference on
Year: 2008
Pages: 63 – 68, DOI: 10.1109/OPTIM.2008.4602458
Referenced in:
Cited by: Papers (2)
IEEE Conference Publications
Recently, there has been an extensive interest in research on the analysis and control of chaotic behavior in nonlinear systems. Various control problems can be defined for such systems, such as targeting the trajectories to a desired point, stabilizing unstable periodic orbits etc. In this paper we present the necessity and possibility to control chaotic dynamic systems. The first part of this pa… View more
On exact Kalman filtering of polynomial systems M. B. Luca; S. Azou; G. Burel; A. Serbanescu IEEE Transactions on Circuits and Systems I: Regular Papers
Year: 2006, Volume: 53, Issue: 6
Pages: 1329 – 1340, DOI: 10.1109/TCSI.2006.870899
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Cited by: Papers (17)
IEEE Journals & Magazines
A closed-form state estimator for some polynomial nonlinear systems is derived in this paper. Exploiting full Taylor series expansion we first give exact matrix expressions to compute mean and covariance of any random variable distribution that has been transformed through a polynomial function. An original discrete-time Kalman filtering implementation relying on this exact polynomial transformati… View more
A complete receiver solution for a chaotic direct-sequence spread spectrum communication system M. B. Luca; S. Azou; G. Burel; A. Serbanescu 2005 IEEE International Symposium on Circuits and Systems
Year: 2005
Pages: 3813 – 3816 Vol. 4, DOI: 10.1109/ISCAS.2005.1465461
Referenced in:
Cited by: Papers (6)
IEEE Conference Publications
This paper is devoted to receiver design in a chaotic direct-sequence spread spectrum (CD3S) digital communication system. The demodulation is achieved through chaos synchronization in an efficient manner thanks to dual unscented Kalman filtering. The problem of carrier phase recovery, frequently neglected in chaos-based communication systems, is addressed either through Costas loop prior to demod… View more
Multipath combining in chaotic direct-sequence spread spectrum communications through dual estimation S. Azou; M. B. Luca; G. Burel; A. Serbanescu Europe Oceans 2005
Year: 2005, Volume: 1
Pages: 616 – 621 Vol. 1, DOI: 10.1109/OCEANSE.2005.1511785
Referenced in:
IEEE Conference Publications
The aim of the present paper is to increase the reliability of a Kalman filter-based DS-SS receiver by considering in the state space models the multipath coefficients and associated delays. The objective being to operate at very low SNRs in shallow water (to achieve furtive transmissions) and with the need of a limited computational cost, the implementation relies on the Unscented Kalman Filter, … View more
MEMS optimization using genetic algorithms G. Leu; S. Simion; A. Serbanescu Semiconductor Conference, 2004. CAS 2004 Proceedings. 2004 International
Year: 2004, Volume: 2
Pages: 475 – 478 vol.2, DOI: 10.1109/SMICND.2004.1403052
Referenced in:
IEEE Conference Publications
Using genetic algorithms, an original method for MEMS optimization is proposed in This work. The optimized MEMS device should provide both minimum switching time and minimum equivalent capacitance, so the highest operating frequency is obtained. By analyzing the results obtained on the switching time for different operating voltage and geometrical configurations, it is important to mention that by… View more
On layout optimization of the microwave diplexor filter using genetic algorithms A. Takacs; A. Serbanescu; G. Leu; H. Aubert; P. Pons; T. Parra; R. Plana Semiconductor Conference, 2004. CAS 2004 Proceedings. 2004 International
Year: 2004, Volume: 1
Pages: 136, DOI: 10.1109/SMICND.2004.1402822
Referenced in:
IEEE Conference Publications
An original application of genetics algorithms in the on layout optimization of the microwave filters is presented. Based on a resonant coupling irises topology, a Ka-band diplexor filter on silicon membrane substrate is tuned in order to improve its performances. The optimization process uses the numerical results given by Sonnet software and the overall process is piloted by a genetic algorithm…. View more
Contribution to the design of the wave filters composed from the elastically coupled two resonators structure I. Mateescu; J. Zelenka; A. Serbanescu European Frequency and Time Forum, 1996. EFTF 96., Tenth (IEE Conf. Publ. 418)
Year: 1996
Pages: 132 – 137, DOI: 10.1049/cp:19960033
Referenced in:
IET Conference Publications