Pub Date : 2004-09-27DOI: 10.1109/ISCCSP.2004.1296333
C. Seddik, F. Fnaiech
This paper is concerned by the use of neural networks and fuzzy logic for controlling a non-linear process namely an induction machine. In the first case study, the design procedure uses a neural model trained with the inverse model of the process. Thus, the overall controlled system is formed using this inverse model. In the second case study, a fuzzy logic controller is implemented. In both cases, the controller is cascaded with the process ensuring the robustness and the stability of the controlled system regarding parameters uncertainties and disturbances. This work analyses the advantages and the drawbacks of each controller in terms of tracking and regulation. It is shown that the fuzzy logic controller is slightly better with respect to the neural network controller in the transient while they have quite similar behaviour in the steady-state regime.
{"title":"Neural networks and fuzzy nonlinear controllers applied to an induction machine","authors":"C. Seddik, F. Fnaiech","doi":"10.1109/ISCCSP.2004.1296333","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296333","url":null,"abstract":"This paper is concerned by the use of neural networks and fuzzy logic for controlling a non-linear process namely an induction machine. In the first case study, the design procedure uses a neural model trained with the inverse model of the process. Thus, the overall controlled system is formed using this inverse model. In the second case study, a fuzzy logic controller is implemented. In both cases, the controller is cascaded with the process ensuring the robustness and the stability of the controlled system regarding parameters uncertainties and disturbances. This work analyses the advantages and the drawbacks of each controller in terms of tracking and regulation. It is shown that the fuzzy logic controller is slightly better with respect to the neural network controller in the transient while they have quite similar behaviour in the steady-state regime.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129489028","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 : 2004-09-27DOI: 10.1109/ISCCSP.2004.1296259
Min Dong, L. Tong, B. Sadler
We consider the problem of reconstructing a one-dimensional Gauss Markov field measured by a large-scale sensor network. Two data retrieval strategies are considered: the scheduling that collects data from equally spaced sensors locations and random access. Assuming the sensors in the field form a Poisson field with density /spl rho/, we examine the reconstruction performance of the signal field based on the data retrieved under the two strategies. Our comparison shows that, the performance under the optimal scheduling is sensitive to the outage probability P/sub out/ of sensors in a given region. If P/sub out/ is large than the threshold, the performance of scheduling suffers from missing data samples, and simple random access outperforms optimal scheduling.
{"title":"Optimal reconstruction of Gauss Markov field in large sensor networks","authors":"Min Dong, L. Tong, B. Sadler","doi":"10.1109/ISCCSP.2004.1296259","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296259","url":null,"abstract":"We consider the problem of reconstructing a one-dimensional Gauss Markov field measured by a large-scale sensor network. Two data retrieval strategies are considered: the scheduling that collects data from equally spaced sensors locations and random access. Assuming the sensors in the field form a Poisson field with density /spl rho/, we examine the reconstruction performance of the signal field based on the data retrieved under the two strategies. Our comparison shows that, the performance under the optimal scheduling is sensitive to the outage probability P/sub out/ of sensors in a given region. If P/sub out/ is large than the threshold, the performance of scheduling suffers from missing data samples, and simple random access outperforms optimal scheduling.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125673876","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 : 2004-09-27DOI: 10.1109/ISCCSP.2004.1296341
C. Watagodakumbura, A. Jennings, N. Shenoy
Differentiated services (DiffServ) architecture is based on aggregation of traffic as opposed to per flow traffic. When DiffServ is used in a real time traffic environment, it is appealing to study absolute effects of traffic aggregation on quality of service parameters. That is, effects are obtained when a burstiness controller such as a token bucket is not used at the entrance of the network. One-way delay and instantaneous packet delay variation (IPDV) are the most commonly used quality of service parameters for real time traffic. Also, fractal or self-similar nature of the Internet traffic has been identified in recent years. In this paper, we study how one-way delay and IPDV are affected by aggregation of self-similar traffic. We make quantitative comparisons of IPDV and one-way delay between aggregated self-similar traffic and exponential inter-arrival traffic using simulations. The only traffic control used at the entrance of the network is an aggregated real time traffic utilization threshold. Further, we bring out the notion of "level of active sources" to explain the statistical multiplexing gains observed in delay variation.
{"title":"Absolute effects of aggregation of self-similar traffic on quality of service parameters","authors":"C. Watagodakumbura, A. Jennings, N. Shenoy","doi":"10.1109/ISCCSP.2004.1296341","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296341","url":null,"abstract":"Differentiated services (DiffServ) architecture is based on aggregation of traffic as opposed to per flow traffic. When DiffServ is used in a real time traffic environment, it is appealing to study absolute effects of traffic aggregation on quality of service parameters. That is, effects are obtained when a burstiness controller such as a token bucket is not used at the entrance of the network. One-way delay and instantaneous packet delay variation (IPDV) are the most commonly used quality of service parameters for real time traffic. Also, fractal or self-similar nature of the Internet traffic has been identified in recent years. In this paper, we study how one-way delay and IPDV are affected by aggregation of self-similar traffic. We make quantitative comparisons of IPDV and one-way delay between aggregated self-similar traffic and exponential inter-arrival traffic using simulations. The only traffic control used at the entrance of the network is an aggregated real time traffic utilization threshold. Further, we bring out the notion of \"level of active sources\" to explain the statistical multiplexing gains observed in delay variation.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114578050","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 : 2004-09-27DOI: 10.1109/ISCCSP.2004.1296328
N. Benouzza, A. Benyettou, A. Bendiabdellah
This paper deals with the application of Park's and advanced Park's vectors approach for the detection of rotor cage faults in operating three phase induction motors. Both simulation and laboratory tests results demonstrate how the present of rotor cage faults can be effectively detected by these approaches.
{"title":"An advanced Park's vectors approach for rotor cage diagnosis","authors":"N. Benouzza, A. Benyettou, A. Bendiabdellah","doi":"10.1109/ISCCSP.2004.1296328","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296328","url":null,"abstract":"This paper deals with the application of Park's and advanced Park's vectors approach for the detection of rotor cage faults in operating three phase induction motors. Both simulation and laboratory tests results demonstrate how the present of rotor cage faults can be effectively detected by these approaches.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"406 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122924856","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 : 2004-09-27DOI: 10.1109/ISCCSP.2004.1296218
J. Roychowdhury
During the design of electronic circuits and systems, particularly those for RF communications, the need to abstract a subsystem from a greater level of detail to one at a lower level of detail arises frequently. One important application is to generate simple, yet accurate, system-level macromodels that capture circuit-level non-idealities such as distortion. In recent years, computational ("algorithmic") techniques have been developed that are capable of automating this abstraction process for broad classes of differential-equation-based systems (including non-linear ones). In this paper, we review the main ideas and techniques behind such algorithmic macromodelling methods.
{"title":"Algorithmic methods for bottom-up generation of system-level RF macromodels","authors":"J. Roychowdhury","doi":"10.1109/ISCCSP.2004.1296218","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296218","url":null,"abstract":"During the design of electronic circuits and systems, particularly those for RF communications, the need to abstract a subsystem from a greater level of detail to one at a lower level of detail arises frequently. One important application is to generate simple, yet accurate, system-level macromodels that capture circuit-level non-idealities such as distortion. In recent years, computational (\"algorithmic\") techniques have been developed that are capable of automating this abstraction process for broad classes of differential-equation-based systems (including non-linear ones). In this paper, we review the main ideas and techniques behind such algorithmic macromodelling methods.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122974774","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 : 2004-09-27DOI: 10.1109/ISCCSP.2004.1296227
M. Trimeche, F. Chebil
With the emergence of wide bandwidth wireless networks, mobile Internet is set to provide a significant channel of multimedia content distribution. In the absence of proper digital rights management (DRM) systems, there is a real risk for content owners and producers to lose important revenues due to their intellectual property rights. To avoid market fragmentation and ensure interoperability, the Open Mobile Alliance (OMA) has set to define open DRM specification in their standardization process. In this paper, we review the specified methods of DRM within OMA. We present a scheme that utilizes watermarking as complementary solution for DRM on mobile devices, and we discuss how it could enhance the security of copyrighted media distribution. We focus the attention on the application of DRM methods for visual content in mobile devices.
{"title":"Digital rights management for visual content in mobile applications","authors":"M. Trimeche, F. Chebil","doi":"10.1109/ISCCSP.2004.1296227","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296227","url":null,"abstract":"With the emergence of wide bandwidth wireless networks, mobile Internet is set to provide a significant channel of multimedia content distribution. In the absence of proper digital rights management (DRM) systems, there is a real risk for content owners and producers to lose important revenues due to their intellectual property rights. To avoid market fragmentation and ensure interoperability, the Open Mobile Alliance (OMA) has set to define open DRM specification in their standardization process. In this paper, we review the specified methods of DRM within OMA. We present a scheme that utilizes watermarking as complementary solution for DRM on mobile devices, and we discuss how it could enhance the security of copyrighted media distribution. We focus the attention on the application of DRM methods for visual content in mobile devices.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"142 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124538720","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 : 2004-09-27DOI: 10.1109/ISCCSP.2004.1296261
Yuan Zhao, A. Tewfik
The paper provides a technique that can successfully recover data when collision occurs in pseudocellular wireless local area networks (WLANs). Pseudocellular WLANs use beamforming at the access point (AP). Mobile users send multiple data packets at the same time using different signature waveforms as in CDMA cellular network. Each user randomly chooses a signature waveform during the contention frame. If the same signature waveforms is selected by more than one user, a collision occurs. The proposed successive multiuser detection scheme with orthogonal ID sequence design enables the system to recover the data from collision. This helps to prevent mobile users from starting back-off timing due to failure in contention for the channel. Hence the total delay is lowered and the capacity of the system improves by a large amount under heavy traffic.
{"title":"Collision resolution in pseudocellular WLANs with beamforming","authors":"Yuan Zhao, A. Tewfik","doi":"10.1109/ISCCSP.2004.1296261","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296261","url":null,"abstract":"The paper provides a technique that can successfully recover data when collision occurs in pseudocellular wireless local area networks (WLANs). Pseudocellular WLANs use beamforming at the access point (AP). Mobile users send multiple data packets at the same time using different signature waveforms as in CDMA cellular network. Each user randomly chooses a signature waveform during the contention frame. If the same signature waveforms is selected by more than one user, a collision occurs. The proposed successive multiuser detection scheme with orthogonal ID sequence design enables the system to recover the data from collision. This helps to prevent mobile users from starting back-off timing due to failure in contention for the channel. Hence the total delay is lowered and the capacity of the system improves by a large amount under heavy traffic.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115141521","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 : 2004-09-27DOI: 10.1109/ISCCSP.2004.1296230
T. D’orazio, C. Guaragnella
An automatic iterative unsupervised data analysis tool is presented as a modification of well known Isodata algorithm. The main feature is its complete blindness and repeatability of the obtained results. It automatically selects a suitable number of features able to describe the whole data set requiring only one input parameter. As an application, color vector quantization has been addressed, both on real and on synthetic data sets, showing good performances.
{"title":"IDA - iterative data analysis applied to color vector quantization","authors":"T. D’orazio, C. Guaragnella","doi":"10.1109/ISCCSP.2004.1296230","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296230","url":null,"abstract":"An automatic iterative unsupervised data analysis tool is presented as a modification of well known Isodata algorithm. The main feature is its complete blindness and repeatability of the obtained results. It automatically selects a suitable number of features able to describe the whole data set requiring only one input parameter. As an application, color vector quantization has been addressed, both on real and on synthetic data sets, showing good performances.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128128707","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 : 2004-09-27DOI: 10.1109/ISCCSP.2004.1296273
S. Smaoui, H. Ghariani, A. Hamida, C. Mhiri, I. Feki
In this article, we propose to study and to conceive a programmable signal generator allowing inhibition of certain types of pain. This system would be provided with an electrode which could be applied in the periphery level of the patient's spinal cord in order to excite the nervous zone responsible for pain transmission. The conceived system would be commanded with variable voltages and piloted by a dedicated microcontroller. This would allow us to have different possibilities in conceiving various shapes of stimulating waves. The purpose is to offer flexibility during clinical adjustments especially when programming the various parameters of electrical stimuli. A PC connection was also provided in order to visualize and to adjust stimulating wave parameters. Our system could be then considered as an original one since it is enhanced by flexibility and maneuverability during clinical trials.
{"title":"Transcutaneous electrical nerve stimulation for pain relief","authors":"S. Smaoui, H. Ghariani, A. Hamida, C. Mhiri, I. Feki","doi":"10.1109/ISCCSP.2004.1296273","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296273","url":null,"abstract":"In this article, we propose to study and to conceive a programmable signal generator allowing inhibition of certain types of pain. This system would be provided with an electrode which could be applied in the periphery level of the patient's spinal cord in order to excite the nervous zone responsible for pain transmission. The conceived system would be commanded with variable voltages and piloted by a dedicated microcontroller. This would allow us to have different possibilities in conceiving various shapes of stimulating waves. The purpose is to offer flexibility during clinical adjustments especially when programming the various parameters of electrical stimuli. A PC connection was also provided in order to visualize and to adjust stimulating wave parameters. Our system could be then considered as an original one since it is enhanced by flexibility and maneuverability during clinical trials.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125827426","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 : 2004-09-27DOI: 10.1109/ISCCSP.2004.1296312
Y. Yu, Guohui Zhao, K. Teo, Y. Lim
Narrow band lowpass or highpass digital finite impulse response filters can be synthesized by using extrapolated impulse response techniques to achieve reduced complexity. However, the non-linear optimization problem of the extrapolated impulse response filters was simplified to a linear programming problem in previous literature leading to suboptimum. In this paper, a semi-infinite programming is proposed to jointly optimize the filter coefficients and the extrapolated scaling factors. A realization structure making use of the coefficient symmetry is also presented. An example taken from literature is included illustrating that the number of multipliers for the resulting filter is less than 65 percent of existing results.
{"title":"Optimization of extrapolated impulse response filters using semi-infinite programming","authors":"Y. Yu, Guohui Zhao, K. Teo, Y. Lim","doi":"10.1109/ISCCSP.2004.1296312","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296312","url":null,"abstract":"Narrow band lowpass or highpass digital finite impulse response filters can be synthesized by using extrapolated impulse response techniques to achieve reduced complexity. However, the non-linear optimization problem of the extrapolated impulse response filters was simplified to a linear programming problem in previous literature leading to suboptimum. In this paper, a semi-infinite programming is proposed to jointly optimize the filter coefficients and the extrapolated scaling factors. A realization structure making use of the coefficient symmetry is also presented. An example taken from literature is included illustrating that the number of multipliers for the resulting filter is less than 65 percent of existing results.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126558278","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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