2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)最新文献
Pub Date : 2000-05-29DOI: 10.1109/MELCON.2000.880071
M. Stasiak, P. Zwierzykowski, M. Głąbowski
In this paper, a new approximate method of point-to-group blocking probability calculation in switching networks carrying a mixture of different multi-rate unicast and multicast traffic streams is presented. Special attention is paid to the methods for determining the effective availability parameter in the case of multicast connections. The results of analytical calculations are compared with the data of digital simulations of switching networks with unicast and multicast connections.
{"title":"Blocking probability in the multi-service switching networks with multicast traffic","authors":"M. Stasiak, P. Zwierzykowski, M. Głąbowski","doi":"10.1109/MELCON.2000.880071","DOIUrl":"https://doi.org/10.1109/MELCON.2000.880071","url":null,"abstract":"In this paper, a new approximate method of point-to-group blocking probability calculation in switching networks carrying a mixture of different multi-rate unicast and multicast traffic streams is presented. Special attention is paid to the methods for determining the effective availability parameter in the case of multicast connections. The results of analytical calculations are compared with the data of digital simulations of switching networks with unicast and multicast connections.","PeriodicalId":151424,"journal":{"name":"2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125061055","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 : 2000-05-29DOI: 10.1109/MELCON.2000.879972
A. Khashman
Low-contrast images, such as DNA autoradiograph images, provide a challenge for edge detection techniques, where the detection of the DNA bands within the images and locating their position is vital. In addition, the speed of recognition, high computational cost, and real-time implementation are also problems that haunt image processing. Thus, new measures are required to solve these problems. This paper reports on a new approach to solving the aforementioned problems. The novel idea is based on combining neural network arbitration and scale space analysis to automatically select one optimum scale for the entire image at which scale space edge detection can be applied. This approach to edge detection is formalised in the automatic edge detection scheme (AEDS). The AEDS is implemented on a real-life application namely, the detection of bands within low-contrast DNA autoradiograph images. An accurate comparison is drawn between the AEDS and the grammar-based multiscale analysis technique (GBMAT).
{"title":"Neural networks arbitration for automatic edge detection of DNA bands in low-contrast images","authors":"A. Khashman","doi":"10.1109/MELCON.2000.879972","DOIUrl":"https://doi.org/10.1109/MELCON.2000.879972","url":null,"abstract":"Low-contrast images, such as DNA autoradiograph images, provide a challenge for edge detection techniques, where the detection of the DNA bands within the images and locating their position is vital. In addition, the speed of recognition, high computational cost, and real-time implementation are also problems that haunt image processing. Thus, new measures are required to solve these problems. This paper reports on a new approach to solving the aforementioned problems. The novel idea is based on combining neural network arbitration and scale space analysis to automatically select one optimum scale for the entire image at which scale space edge detection can be applied. This approach to edge detection is formalised in the automatic edge detection scheme (AEDS). The AEDS is implemented on a real-life application namely, the detection of bands within low-contrast DNA autoradiograph images. An accurate comparison is drawn between the AEDS and the grammar-based multiscale analysis technique (GBMAT).","PeriodicalId":151424,"journal":{"name":"2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128500127","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 : 2000-05-29DOI: 10.1109/MELCON.2000.879981
I. Barrera, F. Tarrés
This paper describes the preliminary work in the development of an MPEG-4 audio transcoder between the time/frequency (T/F) and the structured audio (SA) formats. Our approach consists in not going from T/F format through to waveform data and back again to SA, but extracting the score information from an intermediate stage. For this intermediate form we have chosen the input of the filterbank and block switching tool, which consists of frequency data. This data is the result of windowing and applying the modified discrete cosine transform (MDCT) to the signal. The size of the window to be used is determined in a frame-by-frame basis by a psychoacoustics analysis of the data. In this paper we show that this approach is feasible by developing a system which extracts the score information from the filterbank and block switching tool output in a MPEG-4 T/F encoder by adapting and fine-tuning some existing processing techniques.
{"title":"Score extraction using MPEG-4 T/F partial encoding","authors":"I. Barrera, F. Tarrés","doi":"10.1109/MELCON.2000.879981","DOIUrl":"https://doi.org/10.1109/MELCON.2000.879981","url":null,"abstract":"This paper describes the preliminary work in the development of an MPEG-4 audio transcoder between the time/frequency (T/F) and the structured audio (SA) formats. Our approach consists in not going from T/F format through to waveform data and back again to SA, but extracting the score information from an intermediate stage. For this intermediate form we have chosen the input of the filterbank and block switching tool, which consists of frequency data. This data is the result of windowing and applying the modified discrete cosine transform (MDCT) to the signal. The size of the window to be used is determined in a frame-by-frame basis by a psychoacoustics analysis of the data. In this paper we show that this approach is feasible by developing a system which extracts the score information from the filterbank and block switching tool output in a MPEG-4 T/F encoder by adapting and fine-tuning some existing processing techniques.","PeriodicalId":151424,"journal":{"name":"2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129819787","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 : 2000-05-29DOI: 10.1109/MELCON.2000.880069
J. Pijoan, J. Socoró, J. Moran, F. Tarrés
In this paper, a new blind multiuser detection algorithm is presented. It can both cancel multiuser interference and estimate the multipath channel response in a blind way. The method has been specially conceived for low coherence bandwidth channels such as the ionospheric channel and exhibits very low computational requirements. Real-time measurements from a fully digital HF radio-link are presented that confirm the reliability of the method for the ionospheric channel.
{"title":"DSP-based ionospheric radio-link using DS-CDMA and on-line channel estimation","authors":"J. Pijoan, J. Socoró, J. Moran, F. Tarrés","doi":"10.1109/MELCON.2000.880069","DOIUrl":"https://doi.org/10.1109/MELCON.2000.880069","url":null,"abstract":"In this paper, a new blind multiuser detection algorithm is presented. It can both cancel multiuser interference and estimate the multipath channel response in a blind way. The method has been specially conceived for low coherence bandwidth channels such as the ionospheric channel and exhibits very low computational requirements. Real-time measurements from a fully digital HF radio-link are presented that confirm the reliability of the method for the ionospheric channel.","PeriodicalId":151424,"journal":{"name":"2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130586146","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 : 2000-05-29DOI: 10.1109/MELCON.2000.880051
V. Soare, S. Stancescu
Software simulations are presented for the magnetic and optical recording channels that illustrate the performances, measured in bit error rate (BER) dependence by signal to noise ratio (SNR) characteristics of recording digital sequences, calculated for equalized partial response channels followed by Viterbi detection versus classical methods. A software simulator is used, specially designed to assist the signal processing stages in magnetic and optical recording channels. The simulator includes the concept of partial response channels, channel equalization and detection algorithms, applied to new and classical methods of recording. The BER characteristics are simulated for the peak detection/Viterbi algorithm, classical/PR4/EPR4 recording channels, with/without equalization.
{"title":"Modular partial response channel software simulator","authors":"V. Soare, S. Stancescu","doi":"10.1109/MELCON.2000.880051","DOIUrl":"https://doi.org/10.1109/MELCON.2000.880051","url":null,"abstract":"Software simulations are presented for the magnetic and optical recording channels that illustrate the performances, measured in bit error rate (BER) dependence by signal to noise ratio (SNR) characteristics of recording digital sequences, calculated for equalized partial response channels followed by Viterbi detection versus classical methods. A software simulator is used, specially designed to assist the signal processing stages in magnetic and optical recording channels. The simulator includes the concept of partial response channels, channel equalization and detection algorithms, applied to new and classical methods of recording. The BER characteristics are simulated for the peak detection/Viterbi algorithm, classical/PR4/EPR4 recording channels, with/without equalization.","PeriodicalId":151424,"journal":{"name":"2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130741740","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 : 2000-05-29DOI: 10.1109/MELCON.2000.880065
S. Zoican
The paper illustrated a real time implementation of an adaptive echo canceller using the joint time-frequency analysis. Comparing with a classical adaptive echo canceller, which involves an adaptive LMS (or NLMS) filter the joint time-frequency approach involves a number of adaptive filters. The input of each filter is a subsignal derived from original input signal; these subsignals are the coefficients obtained by a joint time-frequency analysis (like Gabor expansion). The advantage is that the subsignals are whitened by the joint time-frequency analysis and therefore the adaptive filters work better.
{"title":"Joint time-frequency adaptive echo canceller with digital signal processor","authors":"S. Zoican","doi":"10.1109/MELCON.2000.880065","DOIUrl":"https://doi.org/10.1109/MELCON.2000.880065","url":null,"abstract":"The paper illustrated a real time implementation of an adaptive echo canceller using the joint time-frequency analysis. Comparing with a classical adaptive echo canceller, which involves an adaptive LMS (or NLMS) filter the joint time-frequency approach involves a number of adaptive filters. The input of each filter is a subsignal derived from original input signal; these subsignals are the coefficients obtained by a joint time-frequency analysis (like Gabor expansion). The advantage is that the subsignals are whitened by the joint time-frequency analysis and therefore the adaptive filters work better.","PeriodicalId":151424,"journal":{"name":"2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122316502","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 : 2000-05-29DOI: 10.1109/MELCON.2000.880370
N. Papadopoulos, S. Charalampous, J. Combot
The PSTN/ISDN network infrastructure is dimensioned to support traffic characteristics which follow a Poisson distribution pattern. Internet-bound traffic characterised by long "conversation" times deviates from these characteristics resulting in congestion and degradation of the grade of service. This paper discusses, drawing from the work done in Cyprus Telecommunications Authority, (a) the effects of Internet-bound traffic on the quality of service, (b) the short term technical solution applied and (c) the long term solution envisioned.
{"title":"Minimising the impact of Internet-bound traffic in the PSTN/ISDN network","authors":"N. Papadopoulos, S. Charalampous, J. Combot","doi":"10.1109/MELCON.2000.880370","DOIUrl":"https://doi.org/10.1109/MELCON.2000.880370","url":null,"abstract":"The PSTN/ISDN network infrastructure is dimensioned to support traffic characteristics which follow a Poisson distribution pattern. Internet-bound traffic characterised by long \"conversation\" times deviates from these characteristics resulting in congestion and degradation of the grade of service. This paper discusses, drawing from the work done in Cyprus Telecommunications Authority, (a) the effects of Internet-bound traffic on the quality of service, (b) the short term technical solution applied and (c) the long term solution envisioned.","PeriodicalId":151424,"journal":{"name":"2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114204594","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 : 2000-05-29DOI: 10.1109/MELCON.2000.880426
A. Veglis
The Information Age has created many challenges for the traditional established educational institutions. This paper describes the design of World Wide Web-based computer laboratory courses. The purpose of this effort was to support a series of office automation courses and to prepare a series of distance learning courses. Also, the integration of the WWW (and of the Internet in general) in the teaching process is forcing students to familiarize themselves with the use of this valuable tool.
{"title":"Design of a Web based interactive computer lab course","authors":"A. Veglis","doi":"10.1109/MELCON.2000.880426","DOIUrl":"https://doi.org/10.1109/MELCON.2000.880426","url":null,"abstract":"The Information Age has created many challenges for the traditional established educational institutions. This paper describes the design of World Wide Web-based computer laboratory courses. The purpose of this effort was to support a series of office automation courses and to prepare a series of distance learning courses. Also, the integration of the WWW (and of the Internet in general) in the teaching process is forcing students to familiarize themselves with the use of this valuable tool.","PeriodicalId":151424,"journal":{"name":"2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121213145","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 : 2000-05-29DOI: 10.1109/MELCON.2000.879675
O. Sousa, Z. Vale, C. Ramos, J. Neves
The use of information technologies within distribution utilities increases. However, a problem emerges: traditional technologies cannot cope with large distribution automation systems based on heterogeneous sub-systems. To overcome this problem, the authors identify the need for systems integration, high-level co-operation protocols, and powerful and flexible, yet robust, models of interaction. They describe a system architecture for distribution automation composed of object-oriented agents developed in different environments, interconnected using CORBA (Common Object Request Broker Architecture).
{"title":"Object-oriented agents in power distribution automation","authors":"O. Sousa, Z. Vale, C. Ramos, J. Neves","doi":"10.1109/MELCON.2000.879675","DOIUrl":"https://doi.org/10.1109/MELCON.2000.879675","url":null,"abstract":"The use of information technologies within distribution utilities increases. However, a problem emerges: traditional technologies cannot cope with large distribution automation systems based on heterogeneous sub-systems. To overcome this problem, the authors identify the need for systems integration, high-level co-operation protocols, and powerful and flexible, yet robust, models of interaction. They describe a system architecture for distribution automation composed of object-oriented agents developed in different environments, interconnected using CORBA (Common Object Request Broker Architecture).","PeriodicalId":151424,"journal":{"name":"2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123755088","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 : 2000-05-29DOI: 10.1109/MELCON.2000.880062
D. Petrinović
A new, computationally efficient technique for calculation of the line spectrum frequencies (LSF) that can be applied to any order of the LPC analysis is proposed. It is based on the quotient-difference (Q-D) root-finding algorithm that enables simultaneous solution for all the LSFs. It is an iterative procedure that offers the tradeoff between accuracy and complexity, what is especially important for the real-lime applications. To improve the convergence, a nonlinear mapping of the LSFs is also proposed for low accuracy applications, the method is even more effective then the fast converging Newton-Rapshon method, but is at the same time exceptionally simple, has a very regular structure and requires only basic mathematical operations.
{"title":"Calculation of the line spectrum frequencies using the quotient-difference scheme","authors":"D. Petrinović","doi":"10.1109/MELCON.2000.880062","DOIUrl":"https://doi.org/10.1109/MELCON.2000.880062","url":null,"abstract":"A new, computationally efficient technique for calculation of the line spectrum frequencies (LSF) that can be applied to any order of the LPC analysis is proposed. It is based on the quotient-difference (Q-D) root-finding algorithm that enables simultaneous solution for all the LSFs. It is an iterative procedure that offers the tradeoff between accuracy and complexity, what is especially important for the real-lime applications. To improve the convergence, a nonlinear mapping of the LSFs is also proposed for low accuracy applications, the method is even more effective then the fast converging Newton-Rapshon method, but is at the same time exceptionally simple, has a very regular structure and requires only basic mathematical operations.","PeriodicalId":151424,"journal":{"name":"2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123846256","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}
2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)
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