Pub Date : 2011-05-09DOI: 10.1109/WOSSPA.2011.5931445
Amir H. Omidvarnia, M. Mesbah, J. O’Toole, P. Colditz, B. Boashash
Relationships between cortical neural recordings as a representation of functional connectivity between cortical brain regions were quantified using different time-frequency criteria. Among these, Partial Directed Coherence (PDC) and Directed Transfer Function (DTF) and their extensions have found wide acceptance. This paper aims to assess and compare the performance of these two connectivity measures that are based on time-varying multivariate AR modeling. The time-varying parameters of the AR model are estimated using an Adaptive AR modeling (AAR) approach and a short-time based stationary approach. The performance of these two approaches is compared using both simulated signal and a multichannel newborn EEG recording. The results show that the time-varying PDC outperforms the time-varying DTF measure. The results also point to the limitation of the AAR algorithm in tracking rapid parameter changes and the drawback of the short-time approach in providing high resolution time-frequency coherence functions. However, it can be demonstrated that time-varying MVAR representations of the cortical connectivity will potentially lead to better understanding of non-symmetric relations between EEG channels.
{"title":"Analysis of the time-varying cortical neural connectivity in the newborn EEG: A time-frequency approach","authors":"Amir H. Omidvarnia, M. Mesbah, J. O’Toole, P. Colditz, B. Boashash","doi":"10.1109/WOSSPA.2011.5931445","DOIUrl":"https://doi.org/10.1109/WOSSPA.2011.5931445","url":null,"abstract":"Relationships between cortical neural recordings as a representation of functional connectivity between cortical brain regions were quantified using different time-frequency criteria. Among these, Partial Directed Coherence (PDC) and Directed Transfer Function (DTF) and their extensions have found wide acceptance. This paper aims to assess and compare the performance of these two connectivity measures that are based on time-varying multivariate AR modeling. The time-varying parameters of the AR model are estimated using an Adaptive AR modeling (AAR) approach and a short-time based stationary approach. The performance of these two approaches is compared using both simulated signal and a multichannel newborn EEG recording. The results show that the time-varying PDC outperforms the time-varying DTF measure. The results also point to the limitation of the AAR algorithm in tracking rapid parameter changes and the drawback of the short-time approach in providing high resolution time-frequency coherence functions. However, it can be demonstrated that time-varying MVAR representations of the cortical connectivity will potentially lead to better understanding of non-symmetric relations between EEG channels.","PeriodicalId":343415,"journal":{"name":"International Workshop on Systems, Signal Processing and their Applications, WOSSPA","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125494016","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-05-09DOI: 10.1109/WOSSPA.2011.5931429
Y. Belhadef, N. B. Hacene
To answer to the increasing demand of antennas for portable terminals, many works were carried out these last years starting from the shorted-circuit quarter wave antenna more commonly called PIFA (Planar Inverted-F Antenna). These antennas have for principal advantages, their compactness and their weak manufacturing costs, in addition to their significant performances. In this article, we present new geometries for this antenna type. The element feed is carried out by means of a coaxial probe. The suggested structure design, starting from a simple PIFA antenna, by HFSS and IE3D software makes it possible to have Bi-bands, tri-bands and quadribands antennas. The obtained results are then presented and commented.
{"title":"PIFAS antennas design for mobile communications","authors":"Y. Belhadef, N. B. Hacene","doi":"10.1109/WOSSPA.2011.5931429","DOIUrl":"https://doi.org/10.1109/WOSSPA.2011.5931429","url":null,"abstract":"To answer to the increasing demand of antennas for portable terminals, many works were carried out these last years starting from the shorted-circuit quarter wave antenna more commonly called PIFA (Planar Inverted-F Antenna). These antennas have for principal advantages, their compactness and their weak manufacturing costs, in addition to their significant performances. In this article, we present new geometries for this antenna type. The element feed is carried out by means of a coaxial probe. The suggested structure design, starting from a simple PIFA antenna, by HFSS and IE3D software makes it possible to have Bi-bands, tri-bands and quadribands antennas. The obtained results are then presented and commented.","PeriodicalId":343415,"journal":{"name":"International Workshop on Systems, Signal Processing and their Applications, WOSSPA","volume":"369 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121154523","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-05-09DOI: 10.1109/WOSSPA.2011.5931509
A. Nait-Ali
When dealing with biometrics, we generally refer to security biometrics which is a set of techniques used to identify an individual using his biological or behavioral features. But sometimes, biometrics, in particular medical biometrics, refers to some specific methods that are used to quantify or to measure some parameters extracted from medical data. In this paper, we bridge the gap between the security biometrics and the medical biometrics and we try to discuss and highlight the idea which consists in using medical data, such as biosignals, MRI images and X-Ray images for the purpose of individual identification or verification. This is what we call the “Hidden biometrics” or “Intrinsic biometrics”. As we will see, some of the techniques using biosignals are suited for applications requiring frequent up-dates and other approaches which use medical images are particularly robust regarding any potential forgery.
{"title":"Hidden biometrics: Towards using biosignals and biomedical images for security applications","authors":"A. Nait-Ali","doi":"10.1109/WOSSPA.2011.5931509","DOIUrl":"https://doi.org/10.1109/WOSSPA.2011.5931509","url":null,"abstract":"When dealing with biometrics, we generally refer to security biometrics which is a set of techniques used to identify an individual using his biological or behavioral features. But sometimes, biometrics, in particular medical biometrics, refers to some specific methods that are used to quantify or to measure some parameters extracted from medical data. In this paper, we bridge the gap between the security biometrics and the medical biometrics and we try to discuss and highlight the idea which consists in using medical data, such as biosignals, MRI images and X-Ray images for the purpose of individual identification or verification. This is what we call the “Hidden biometrics” or “Intrinsic biometrics”. As we will see, some of the techniques using biosignals are suited for applications requiring frequent up-dates and other approaches which use medical images are particularly robust regarding any potential forgery.","PeriodicalId":343415,"journal":{"name":"International Workshop on Systems, Signal Processing and their Applications, WOSSPA","volume":"257 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115958944","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-05-09DOI: 10.1109/WOSSPA.2011.5931438
M. Adjrad, K. Woodbridge
In conventional radar systems, Woodward's ambiguity function is used to characterize waveform resolution performance. It has been demonstrated that a multistatic (MS) formulation of the ambiguity function can be used to analyze MS radar systems. For these latter, the MS ambiguity function can be exploited as a guideline for developing MS radar signal processing rules and waveform selection strategies. In this paper, we develop the concept of MS ambiguity function such that it simultaneously characterize the effects on resolution performance of system geometry and transmitted waveforms of MS radar systems with multiple transmitters and receivers. Visual examples are provided to illustrate the possible resolution enhancement using MS technology and highlighting its additional dependence on the type of detection used to process the received signals.
{"title":"A framework for the analysisof spatially coherent and incoherent multistatic radar systems","authors":"M. Adjrad, K. Woodbridge","doi":"10.1109/WOSSPA.2011.5931438","DOIUrl":"https://doi.org/10.1109/WOSSPA.2011.5931438","url":null,"abstract":"In conventional radar systems, Woodward's ambiguity function is used to characterize waveform resolution performance. It has been demonstrated that a multistatic (MS) formulation of the ambiguity function can be used to analyze MS radar systems. For these latter, the MS ambiguity function can be exploited as a guideline for developing MS radar signal processing rules and waveform selection strategies. In this paper, we develop the concept of MS ambiguity function such that it simultaneously characterize the effects on resolution performance of system geometry and transmitted waveforms of MS radar systems with multiple transmitters and receivers. Visual examples are provided to illustrate the possible resolution enhancement using MS technology and highlighting its additional dependence on the type of detection used to process the received signals.","PeriodicalId":343415,"journal":{"name":"International Workshop on Systems, Signal Processing and their Applications, WOSSPA","volume":"119 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116199599","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-05-09DOI: 10.1109/WOSSPA.2011.5931463
F. Nafa, S. Labiod, H. Chekireb
Based on sliding mode control, a new Structured Sliding Mode Controller (SSMC) for a class of underactuated mechanical systems (UMSs) with three degrees of freedom (DOF) is presented in this paper. Mainly, this class of UMSs presents three DOF and includes three different subsystems. Moreover, three sliding surfaces are constructed and in order to guarantee the convergence to zero of each sliding surface, a new control strategy is proposed. By using theoretical analysis, the SSMC is proved to let all states converge asymptotically to zero. Simulation results applied on a double inverted pendulum on cart show the validity of the proposed method.
{"title":"A structured sliding mode controller for a class of underactuated mechanical systems","authors":"F. Nafa, S. Labiod, H. Chekireb","doi":"10.1109/WOSSPA.2011.5931463","DOIUrl":"https://doi.org/10.1109/WOSSPA.2011.5931463","url":null,"abstract":"Based on sliding mode control, a new Structured Sliding Mode Controller (SSMC) for a class of underactuated mechanical systems (UMSs) with three degrees of freedom (DOF) is presented in this paper. Mainly, this class of UMSs presents three DOF and includes three different subsystems. Moreover, three sliding surfaces are constructed and in order to guarantee the convergence to zero of each sliding surface, a new control strategy is proposed. By using theoretical analysis, the SSMC is proved to let all states converge asymptotically to zero. Simulation results applied on a double inverted pendulum on cart show the validity of the proposed method.","PeriodicalId":343415,"journal":{"name":"International Workshop on Systems, Signal Processing and their Applications, WOSSPA","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117071462","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-05-09DOI: 10.1109/WOSSPA.2011.5931451
A. Miraoui, H. Snoussi, J. Duchêne
In biomedical signal processing, many sources are often mixed as a form of measured signal. The goal is usually to extract and analyze one or several of them separately. In the multichannel measurements, several Blind Source Separation (BSS) techniques are available for decomposing the signal into its components. In this paper, a novel method is presented for the reconstruction of individual muscle source signals from simulated surface Elec-tromyography (s-EMG) array recordings. This method is based on BSS in a Bayesian model selection framework. Specifically, it is relies on an efficient wavelet spectral matching separating algorithm. Our concept is evaluated on theoretical decomposition and is confirmed by simulated signals.
{"title":"On the surface EMG signal reconstruction using blind source separation","authors":"A. Miraoui, H. Snoussi, J. Duchêne","doi":"10.1109/WOSSPA.2011.5931451","DOIUrl":"https://doi.org/10.1109/WOSSPA.2011.5931451","url":null,"abstract":"In biomedical signal processing, many sources are often mixed as a form of measured signal. The goal is usually to extract and analyze one or several of them separately. In the multichannel measurements, several Blind Source Separation (BSS) techniques are available for decomposing the signal into its components. In this paper, a novel method is presented for the reconstruction of individual muscle source signals from simulated surface Elec-tromyography (s-EMG) array recordings. This method is based on BSS in a Bayesian model selection framework. Specifically, it is relies on an efficient wavelet spectral matching separating algorithm. Our concept is evaluated on theoretical decomposition and is confirmed by simulated signals.","PeriodicalId":343415,"journal":{"name":"International Workshop on Systems, Signal Processing and their Applications, WOSSPA","volume":"122 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127065195","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-05-09DOI: 10.1109/WOSSPA.2011.5931473
A. Maali, A. Mesloub, M. Djeddou, G. Baudoin, H. Mimoun, A. Ouldali
In this paper, we simplify the architecture of the cell averaging constant false alarm rate (CA-CFAR) approach used in time-of-arrival (TOA) estimation for impulse radio ultra wideband (IR-UWB) systems. The CA-CFAR approach uses the received signal samples provided by the non-coherent energy detection (ED) receivers. The modified approach is evaluated by Monte Carlo simulation on the CM1 channel model of the standard IEEE802.15.4a. The effects of the reference cells number and the guard cells duration on the performances of the modified CA-CFAR approach are studied. The simulation demonstrates that the modified approach gives better results than the conventional approaches.
{"title":"CA-CFAR threshold selection for IR-UWB TOA estimation","authors":"A. Maali, A. Mesloub, M. Djeddou, G. Baudoin, H. Mimoun, A. Ouldali","doi":"10.1109/WOSSPA.2011.5931473","DOIUrl":"https://doi.org/10.1109/WOSSPA.2011.5931473","url":null,"abstract":"In this paper, we simplify the architecture of the cell averaging constant false alarm rate (CA-CFAR) approach used in time-of-arrival (TOA) estimation for impulse radio ultra wideband (IR-UWB) systems. The CA-CFAR approach uses the received signal samples provided by the non-coherent energy detection (ED) receivers. The modified approach is evaluated by Monte Carlo simulation on the CM1 channel model of the standard IEEE802.15.4a. The effects of the reference cells number and the guard cells duration on the performances of the modified CA-CFAR approach are studied. The simulation demonstrates that the modified approach gives better results than the conventional approaches.","PeriodicalId":343415,"journal":{"name":"International Workshop on Systems, Signal Processing and their Applications, WOSSPA","volume":"492 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122896457","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-05-09DOI: 10.1109/WOSSPA.2011.5931409
M. A. Khettat, S. Bouaziz, H. Imine, S. Espié
This paper presents a motorized two-wheeled vehicle automation project. More precisely, an approach of a motorcycle control to develop an autopilot is proposed. There are several objectives: improve the dynamic behavior of a motorcycle, develop control tools to assist the driver … etc. In this paper, we present the first phase of this project, related to the motorcycle instrumentation by several sensors in order to measure its behavior and to deduce its attitude in the space. The second phase will consists of the addition of actuators to automate its control units (front and rear brakes, throttle, steering). The third phase is devoted to the control architecture. We also present methodology to measure the position of the gravity centre and estimate the inertia moment of steering system. These two parameters are very important in the dynamic model which is under development.
{"title":"Motorcycle automation: System approach","authors":"M. A. Khettat, S. Bouaziz, H. Imine, S. Espié","doi":"10.1109/WOSSPA.2011.5931409","DOIUrl":"https://doi.org/10.1109/WOSSPA.2011.5931409","url":null,"abstract":"This paper presents a motorized two-wheeled vehicle automation project. More precisely, an approach of a motorcycle control to develop an autopilot is proposed. There are several objectives: improve the dynamic behavior of a motorcycle, develop control tools to assist the driver … etc. In this paper, we present the first phase of this project, related to the motorcycle instrumentation by several sensors in order to measure its behavior and to deduce its attitude in the space. The second phase will consists of the addition of actuators to automate its control units (front and rear brakes, throttle, steering). The third phase is devoted to the control architecture. We also present methodology to measure the position of the gravity centre and estimate the inertia moment of steering system. These two parameters are very important in the dynamic model which is under development.","PeriodicalId":343415,"journal":{"name":"International Workshop on Systems, Signal Processing and their Applications, WOSSPA","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128177756","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-05-09DOI: 10.1109/WOSSPA.2011.5931407
Z. Anane, A. Bayadi
Several mathematical and physical models of corona effect have been developed over the world. The main difference between them resides in the modeling techniques and the adopted hypotheses. To the author knowledge, until now the ATP-EMTP (ElectroMagnetic Transients Program) package does not have such model. The main objective of this work is the implementation of a model which is based on the phenomenon physical properties using the ATP-EMTP interface called MODELS. The implemented model has been exploited to predict the non-linear variations of the corona charge as a function of voltage and the corona capacitance for coaxial conductor configuration. The obtained results show that the model reproduces accurately the experimental results.
{"title":"Implantation of a static model of the corona effect in the ATP-EMTP software","authors":"Z. Anane, A. Bayadi","doi":"10.1109/WOSSPA.2011.5931407","DOIUrl":"https://doi.org/10.1109/WOSSPA.2011.5931407","url":null,"abstract":"Several mathematical and physical models of corona effect have been developed over the world. The main difference between them resides in the modeling techniques and the adopted hypotheses. To the author knowledge, until now the ATP-EMTP (ElectroMagnetic Transients Program) package does not have such model. The main objective of this work is the implementation of a model which is based on the phenomenon physical properties using the ATP-EMTP interface called MODELS. The implemented model has been exploited to predict the non-linear variations of the corona charge as a function of voltage and the corona capacitance for coaxial conductor configuration. The obtained results show that the model reproduces accurately the experimental results.","PeriodicalId":343415,"journal":{"name":"International Workshop on Systems, Signal Processing and their Applications, WOSSPA","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130879549","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-05-09DOI: 10.1109/WOSSPA.2011.5931468
C. Fossati, Dong Han, S. Bourennane
This paper deals with buried object localization using a towed flexible array of sensors. We consider a new model by taking into account both the reflection and the refraction of wave at water-sediment interface. A new directional vector containing the bearings and the ranges of objects is proposed instead of classical plane wave used in MUSIC algorithm. To decorrelate the received signals and to estimate the coherent signal subspace a fast focusing operator is proposed. The robust DIRECT (DIviding RECTangles) method accelerated by spline interpolation is applied to estimate simultaneously the bearings and the ranges in the presence of phase errors. The performance of the developed methods is investigated on experimental data recorded during underwater acoustics experiments.
{"title":"Characterization of buried objects using wideband signals","authors":"C. Fossati, Dong Han, S. Bourennane","doi":"10.1109/WOSSPA.2011.5931468","DOIUrl":"https://doi.org/10.1109/WOSSPA.2011.5931468","url":null,"abstract":"This paper deals with buried object localization using a towed flexible array of sensors. We consider a new model by taking into account both the reflection and the refraction of wave at water-sediment interface. A new directional vector containing the bearings and the ranges of objects is proposed instead of classical plane wave used in MUSIC algorithm. To decorrelate the received signals and to estimate the coherent signal subspace a fast focusing operator is proposed. The robust DIRECT (DIviding RECTangles) method accelerated by spline interpolation is applied to estimate simultaneously the bearings and the ranges in the presence of phase errors. The performance of the developed methods is investigated on experimental data recorded during underwater acoustics experiments.","PeriodicalId":343415,"journal":{"name":"International Workshop on Systems, Signal Processing and their Applications, WOSSPA","volume":"516 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133241623","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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