Pub Date : 2006-03-20DOI: 10.1109/IEEEGCC.2006.5686233
V. Farahani, A. Kazemi
The restructuring of the electric power industry has involved paradigm shifts in the real time control activities of the power grids. Managing dispatch is one of the important control activities in a power system. With the trend of an increasing number of bilateral contracts being signed for electricity market trades, the possibility of insufficient resources leading to network congestion may be unavoidable. In this scenario, congestion management becomes an important issue. Real-time transmission congestion can be defined as the operating condition in which there is not enough transmission capability to implement all the traded transactions. It may be alleviated by incorporating line capacity constraints in the dispatch and scheduling process. This may involve redispatch of generation or load curtailment. Other possible means for relieving congestion are operation of FACTS devices (TCSC), these two ways are compared in this paper.
{"title":"Comparing two ways of congestion management in bilateral based power market","authors":"V. Farahani, A. Kazemi","doi":"10.1109/IEEEGCC.2006.5686233","DOIUrl":"https://doi.org/10.1109/IEEEGCC.2006.5686233","url":null,"abstract":"The restructuring of the electric power industry has involved paradigm shifts in the real time control activities of the power grids. Managing dispatch is one of the important control activities in a power system. With the trend of an increasing number of bilateral contracts being signed for electricity market trades, the possibility of insufficient resources leading to network congestion may be unavoidable. In this scenario, congestion management becomes an important issue. Real-time transmission congestion can be defined as the operating condition in which there is not enough transmission capability to implement all the traded transactions. It may be alleviated by incorporating line capacity constraints in the dispatch and scheduling process. This may involve redispatch of generation or load curtailment. Other possible means for relieving congestion are operation of FACTS devices (TCSC), these two ways are compared in this paper.","PeriodicalId":433452,"journal":{"name":"2006 IEEE GCC Conference (GCC)","volume":"388 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124809232","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 : 2006-03-20DOI: 10.1109/IEEEGCC.2006.5686249
M. Taleb, Mohamed Jassim Ditto, T. Bouthiba
Performance of a short transmission line models is investigated in this paper. The performance accuracy is assessed by considering three dynamic models for the line. Computer simulations show that the results of the dynamic models agree with the results of the standard line model during steady state operations but they disagree with it during transient circumstances. In controlling the level of transients, the paper results recommend that in energizing a line, it is preferable to switch-on the poles of circuit breaker in a sequential manner rather than in a simultaneous manner. Also, simulation results show that transient voltages in a loaded line case are more severe than the unloaded line case.
{"title":"Performance of short transmission lines models","authors":"M. Taleb, Mohamed Jassim Ditto, T. Bouthiba","doi":"10.1109/IEEEGCC.2006.5686249","DOIUrl":"https://doi.org/10.1109/IEEEGCC.2006.5686249","url":null,"abstract":"Performance of a short transmission line models is investigated in this paper. The performance accuracy is assessed by considering three dynamic models for the line. Computer simulations show that the results of the dynamic models agree with the results of the standard line model during steady state operations but they disagree with it during transient circumstances. In controlling the level of transients, the paper results recommend that in energizing a line, it is preferable to switch-on the poles of circuit breaker in a sequential manner rather than in a simultaneous manner. Also, simulation results show that transient voltages in a loaded line case are more severe than the unloaded line case.","PeriodicalId":433452,"journal":{"name":"2006 IEEE GCC Conference (GCC)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125251565","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 : 2006-03-20DOI: 10.1109/IEEEGCC.2006.5686240
S. A. Sattarzadeh, B. Abolhassani
This paper proposes and evaluates a simple and efficient method to mitigate the positioning error caused by Multipath fading channels. Using geometric properties of the correlated received signals and Monte Carlo simulations, a lookup table has been developed to correct the TDOA estimation error. The performance of this multipath rejection (MPR) method has been evaluated for 3GPP wireless network standards. Simulation results show that the proposed method reduces the TDOA estimation error significantly and therefore improves the accuracy of mobile position estimation.
{"title":"A simple and efficient method of multipath rejection (MPR) in Multipath fading channels for location estimations","authors":"S. A. Sattarzadeh, B. Abolhassani","doi":"10.1109/IEEEGCC.2006.5686240","DOIUrl":"https://doi.org/10.1109/IEEEGCC.2006.5686240","url":null,"abstract":"This paper proposes and evaluates a simple and efficient method to mitigate the positioning error caused by Multipath fading channels. Using geometric properties of the correlated received signals and Monte Carlo simulations, a lookup table has been developed to correct the TDOA estimation error. The performance of this multipath rejection (MPR) method has been evaluated for 3GPP wireless network standards. Simulation results show that the proposed method reduces the TDOA estimation error significantly and therefore improves the accuracy of mobile position estimation.","PeriodicalId":433452,"journal":{"name":"2006 IEEE GCC Conference (GCC)","volume":"103 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116788394","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 : 2006-03-20DOI: 10.1109/IEEEGCC.2006.5686246
H. Sayoud, S. Ouamour
Given that most of the speech signal recordings are generally mixed with other sounds like music, songs, or noises and knowing that the processing of any speech signal will be easier when we separate the speech area from the non-speech area, we propose a preprocessing method for speech/ non speech discrimination which is also able to identify some acoustic sounds, by using some statistical observations (mean, standard deviation) linked to a statistic measure of similarity (μGc). Since it has been possible to discriminate between speakers thanks to the small within-variability and the large between-variability of the speaker's acoustic features, we thought to extend this property for the purpose of acoustic sounds discrimination. Thus, we led an investigation on different types of sounds as: noises, music and speech (speech signals are extracted from TIMIT database). The purpose of this investigation is to try to define a separate class for each type of sound according to the similarity measure μGc. Experiments showed that the similarity distance range, between speech and other acoustic signals, has a mean and standard deviation which are specific for each sound. So, for instance it will be possible to state whether a particular audio signal is really speech or non-speech, only by observing the statistical range of the μGc which is chosen as a similarity distance. For instance, we have deduced that thanks to the value of μGc it is possible to know if an audio frame is a pure speech or music: if μGc is within [2.5-4.9] then the considered sound should be music.
{"title":"Statistical discrimination and identification of some acoustic sounds","authors":"H. Sayoud, S. Ouamour","doi":"10.1109/IEEEGCC.2006.5686246","DOIUrl":"https://doi.org/10.1109/IEEEGCC.2006.5686246","url":null,"abstract":"Given that most of the speech signal recordings are generally mixed with other sounds like music, songs, or noises and knowing that the processing of any speech signal will be easier when we separate the speech area from the non-speech area, we propose a preprocessing method for speech/ non speech discrimination which is also able to identify some acoustic sounds, by using some statistical observations (mean, standard deviation) linked to a statistic measure of similarity (μGc). Since it has been possible to discriminate between speakers thanks to the small within-variability and the large between-variability of the speaker's acoustic features, we thought to extend this property for the purpose of acoustic sounds discrimination. Thus, we led an investigation on different types of sounds as: noises, music and speech (speech signals are extracted from TIMIT database). The purpose of this investigation is to try to define a separate class for each type of sound according to the similarity measure μGc. Experiments showed that the similarity distance range, between speech and other acoustic signals, has a mean and standard deviation which are specific for each sound. So, for instance it will be possible to state whether a particular audio signal is really speech or non-speech, only by observing the statistical range of the μGc which is chosen as a similarity distance. For instance, we have deduced that thanks to the value of μGc it is possible to know if an audio frame is a pure speech or music: if μGc is within [2.5-4.9] then the considered sound should be music.","PeriodicalId":433452,"journal":{"name":"2006 IEEE GCC Conference (GCC)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131697899","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 : 2006-03-20DOI: 10.1109/IEEEGCC.2006.5686258
A. Vallavaraj, G. S. Brian, K. David, G. M. Francis
In this paper the performance of different convolutional code generator polynomials with constraint length 7 is examined in relation to OFDM transmissions. The performance is evaluated in terms to Bit Error Rate (BER) in white Gaussian noise and Peak-to-Average Power Ratio (PAPR). It is shown that convolutional codes with identical generator polynomials result in very poor BER performance, however surprisingly, identical polynomial combinations seem to possess the advantage of reducing slightly the PAPR. The standard convolution code (7, [171, 133]), commonly used in wireless systems, is shown to possess reasonably good BER and similar PAPR performance in comparison to other non-identical polynomial codes, but possesses a slightly higher average PAPR when compared to identical generator polynomial combinations.
{"title":"Optimizing the rate 1/2; convolutional code for OFDM applications in terms of bit-error-rate and Peak-to-Average Power Ratio","authors":"A. Vallavaraj, G. S. Brian, K. David, G. M. Francis","doi":"10.1109/IEEEGCC.2006.5686258","DOIUrl":"https://doi.org/10.1109/IEEEGCC.2006.5686258","url":null,"abstract":"In this paper the performance of different convolutional code generator polynomials with constraint length 7 is examined in relation to OFDM transmissions. The performance is evaluated in terms to Bit Error Rate (BER) in white Gaussian noise and Peak-to-Average Power Ratio (PAPR). It is shown that convolutional codes with identical generator polynomials result in very poor BER performance, however surprisingly, identical polynomial combinations seem to possess the advantage of reducing slightly the PAPR. The standard convolution code (7, [171, 133]), commonly used in wireless systems, is shown to possess reasonably good BER and similar PAPR performance in comparison to other non-identical polynomial codes, but possesses a slightly higher average PAPR when compared to identical generator polynomial combinations.","PeriodicalId":433452,"journal":{"name":"2006 IEEE GCC Conference (GCC)","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123842104","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 : 2006-03-20DOI: 10.1109/IEEEGCC.2006.5686223
A. B. Sediq, M. El-Tarhuni
An improved technique for image transmission over wireless channel with flat Rayleigh fading is considered in this paper. The proposed scheme minimizes the mean-square error in image transmission rather than the bit error rate. The minimization is done by optimizing the power allocated to each bit according to its importance to the image quality along with the use of channel coding. An algorithm that works iteratively to achieve this goal is presented and analyzed in this paper. It is shown that the proposed technique provides significant gain compared to conventional schemes that send the same power for all bits. It also provides better performance compared to the case were power allocation alone or coding alone is used, with a gain of 2 to 3 dB. It also provides a good performance in terms of reducing the peak-to-average power ratio compared to the case of power allocation alone.
{"title":"Improved image transmission over wireless channels","authors":"A. B. Sediq, M. El-Tarhuni","doi":"10.1109/IEEEGCC.2006.5686223","DOIUrl":"https://doi.org/10.1109/IEEEGCC.2006.5686223","url":null,"abstract":"An improved technique for image transmission over wireless channel with flat Rayleigh fading is considered in this paper. The proposed scheme minimizes the mean-square error in image transmission rather than the bit error rate. The minimization is done by optimizing the power allocated to each bit according to its importance to the image quality along with the use of channel coding. An algorithm that works iteratively to achieve this goal is presented and analyzed in this paper. It is shown that the proposed technique provides significant gain compared to conventional schemes that send the same power for all bits. It also provides better performance compared to the case were power allocation alone or coding alone is used, with a gain of 2 to 3 dB. It also provides a good performance in terms of reducing the peak-to-average power ratio compared to the case of power allocation alone.","PeriodicalId":433452,"journal":{"name":"2006 IEEE GCC Conference (GCC)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123844466","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 : 2006-03-20DOI: 10.1109/IEEEGCC.2006.5686219
I. Zualkernan, Salim M Abu-Naaj
Mutation testing has been used to construct test cases and to evaluate the effectiveness of testing methods. Several methods have recently been proposed to generate test sequences from higher level design models such as UML state and activity diagrams. This paper presents a scalable web-services based architecture that can evaluate the effectiveness of these methods using mutation analysis. The architecture defines several mutation operators for activity diagrams based on the Hazmat classification. The paper also presents a case study using this architecture to evaluate automatically generated tests for designers. The architecture is implemented using the Apache Axis framework.
{"title":"A web services-based architecture for mutation analysis of UML activity diagrams","authors":"I. Zualkernan, Salim M Abu-Naaj","doi":"10.1109/IEEEGCC.2006.5686219","DOIUrl":"https://doi.org/10.1109/IEEEGCC.2006.5686219","url":null,"abstract":"Mutation testing has been used to construct test cases and to evaluate the effectiveness of testing methods. Several methods have recently been proposed to generate test sequences from higher level design models such as UML state and activity diagrams. This paper presents a scalable web-services based architecture that can evaluate the effectiveness of these methods using mutation analysis. The architecture defines several mutation operators for activity diagrams based on the Hazmat classification. The paper also presents a case study using this architecture to evaluate automatically generated tests for designers. The architecture is implemented using the Apache Axis framework.","PeriodicalId":433452,"journal":{"name":"2006 IEEE GCC Conference (GCC)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125234091","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 : 2006-03-20DOI: 10.1109/IEEEGCC.2006.5686260
M. Asif, M. Omer, A. Luna, N. Sheikh
Recent years have seen rapid evolution in the architectures being explored for realizing high-speed software-defined radios. There is, however, a distinct need for a low-cost programmable platform where algorithms for base-band transceivers can be rapidly prototyped and tested with real-world data, streaming in from diverse sources of telecommunication traffic. This paper explores an analytical method for laying out such a generic platform. It investigates the constraints involved in realizing such a platform, and the minimum functionality needed within the solution so as to provide adequate scalability to allow the implementation of a wide variety of communication algorithms. The paper concludes with a case study of a multi-channel communication system that has been successfully implemented on the proposed platform, highlighting the performance benchmarks it had to meet in order to prove suitable for the task of communication system evaluation.
{"title":"A multiprocessor framework for rapid-prototyping and evaluation of soft transceivers","authors":"M. Asif, M. Omer, A. Luna, N. Sheikh","doi":"10.1109/IEEEGCC.2006.5686260","DOIUrl":"https://doi.org/10.1109/IEEEGCC.2006.5686260","url":null,"abstract":"Recent years have seen rapid evolution in the architectures being explored for realizing high-speed software-defined radios. There is, however, a distinct need for a low-cost programmable platform where algorithms for base-band transceivers can be rapidly prototyped and tested with real-world data, streaming in from diverse sources of telecommunication traffic. This paper explores an analytical method for laying out such a generic platform. It investigates the constraints involved in realizing such a platform, and the minimum functionality needed within the solution so as to provide adequate scalability to allow the implementation of a wide variety of communication algorithms. The paper concludes with a case study of a multi-channel communication system that has been successfully implemented on the proposed platform, highlighting the performance benchmarks it had to meet in order to prove suitable for the task of communication system evaluation.","PeriodicalId":433452,"journal":{"name":"2006 IEEE GCC Conference (GCC)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126184509","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 : 2006-03-20DOI: 10.1109/IEEEGCC.2006.5686230
A. Hellany
The new and active learning environment in tertiary education is forcing academics to discuss the effectiveness of traditional teaching strategies that address the diverse learning styles of engineering students. A number of personality type indicators have been used in the past to determine students various learning styles. This paper introduces the Enneagram as a new tool to determine the student's learning style. The Enneagram can also be used to describe psychological preferences of engineering educators.
{"title":"Enneagram: Exploring learning styles of engineering students","authors":"A. Hellany","doi":"10.1109/IEEEGCC.2006.5686230","DOIUrl":"https://doi.org/10.1109/IEEEGCC.2006.5686230","url":null,"abstract":"The new and active learning environment in tertiary education is forcing academics to discuss the effectiveness of traditional teaching strategies that address the diverse learning styles of engineering students. A number of personality type indicators have been used in the past to determine students various learning styles. This paper introduces the Enneagram as a new tool to determine the student's learning style. The Enneagram can also be used to describe psychological preferences of engineering educators.","PeriodicalId":433452,"journal":{"name":"2006 IEEE GCC Conference (GCC)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115303760","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 : 2006-03-20DOI: 10.1109/IEEEGCC.2006.5686193
T. Mundt
Location is part of the context of an ensemble of mobile nodes in a wireless mesh network. In this paper we present a concept and an architecture for a location aware Digital Rights Management system. This system uses signal strengths in a mobile ad-hoc or mesh network to determine the position of each node and to authenticate these position information. It enables devices to control access depending on their position. We describe algorithms, protocols, security threats, and a prototype.
{"title":"Authenticated location in wireless mesh networks","authors":"T. Mundt","doi":"10.1109/IEEEGCC.2006.5686193","DOIUrl":"https://doi.org/10.1109/IEEEGCC.2006.5686193","url":null,"abstract":"Location is part of the context of an ensemble of mobile nodes in a wireless mesh network. In this paper we present a concept and an architecture for a location aware Digital Rights Management system. This system uses signal strengths in a mobile ad-hoc or mesh network to determine the position of each node and to authenticate these position information. It enables devices to control access depending on their position. We describe algorithms, protocols, security threats, and a prototype.","PeriodicalId":433452,"journal":{"name":"2006 IEEE GCC Conference (GCC)","volume":"125 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129686503","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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