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.2000.879983
L. Stanimirovic
This paper considers an interactive dialogue telephone service which provides information about cultural events in Belgrade for the following week. The dialogue user-system is based on the keyword recognition in continuous Serbian. The main part of the system is dialogue manager, which has to coordinate the system components. We consider the system question and the user answer as one dialogue level. At each level, the system has to recognize a limited number of keywords. The keyword models are continuous hidden Markov models with three states for each keyword's syllable. The decoding phase confidence measure, computed on the pronounced sentence, shows the keyword has been pronounced. Thresholds and optimal step sizes for confidence measures for each keyword are determined in the training phase.
{"title":"Interactive dialogue telephone service","authors":"L. Stanimirovic","doi":"10.1109/MELCON.2000.879983","DOIUrl":"https://doi.org/10.1109/MELCON.2000.879983","url":null,"abstract":"This paper considers an interactive dialogue telephone service which provides information about cultural events in Belgrade for the following week. The dialogue user-system is based on the keyword recognition in continuous Serbian. The main part of the system is dialogue manager, which has to coordinate the system components. We consider the system question and the user answer as one dialogue level. At each level, the system has to recognize a limited number of keywords. The keyword models are continuous hidden Markov models with three states for each keyword's syllable. The decoding phase confidence measure, computed on the pronounced sentence, shows the keyword has been pronounced. Thresholds and optimal step sizes for confidence measures for each keyword are determined in the training phase.","PeriodicalId":151424,"journal":{"name":"2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)","volume":"71 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":"131574691","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.2000.880061
L. Varga, G. Hosszú, F. Kovács
We present a novel design technique to reduce the power consumption of the data paths. Our technique is based on the observation that a circuit can be optimally synthesized for a particular type of inputs. We use logic-level techniques to re-synthesize data path elements to be effective in terms of power dissipation. The regularity of data path elements are destroyed, however, voltage scaling can be applied, which result in power savings.
{"title":"A low-power design technique for digital signal processing applications","authors":"L. Varga, G. Hosszú, F. Kovács","doi":"10.1109/MELCON.2000.880061","DOIUrl":"https://doi.org/10.1109/MELCON.2000.880061","url":null,"abstract":"We present a novel design technique to reduce the power consumption of the data paths. Our technique is based on the observation that a circuit can be optimally synthesized for a particular type of inputs. We use logic-level techniques to re-synthesize data path elements to be effective in terms of power dissipation. The regularity of data path elements are destroyed, however, voltage scaling can be applied, which result in power savings.","PeriodicalId":151424,"journal":{"name":"2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)","volume":"26 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":"131580167","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.2000.880000
Z. Bertalan, P. Kádár
In this paper, the authors show a real life application of Pawlak's rough set theory and neural networks in the area of power trading. European power systems are closely interconnected with each other, resulting in unexpected loop flows. This phenomena and the lack of commercially viable information make it very difficult for power traders to trade successfully with power. Rough set theory was used to determine the significant inputs of a neural network that could be applied in trading activity. In this paper, the authors also present a general optimization technique and a real application of the neural nets in power systems.
{"title":"Application of rough set theory for determining the significant inputs of an ANN [power trading calculations]","authors":"Z. Bertalan, P. Kádár","doi":"10.1109/MELCON.2000.880000","DOIUrl":"https://doi.org/10.1109/MELCON.2000.880000","url":null,"abstract":"In this paper, the authors show a real life application of Pawlak's rough set theory and neural networks in the area of power trading. European power systems are closely interconnected with each other, resulting in unexpected loop flows. This phenomena and the lack of commercially viable information make it very difficult for power traders to trade successfully with power. Rough set theory was used to determine the significant inputs of a neural network that could be applied in trading activity. In this paper, the authors also present a general optimization technique and a real application of the neural nets in power systems.","PeriodicalId":151424,"journal":{"name":"2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)","volume":"295 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":"131639305","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.2000.879686
M. Lorentzou, N. Hatziargyriou, B. Papadias
In this paper, the response of wind turbine grounding systems is calculated under fault conditions or when they are hit by lightning. The objective is their effective design in terms of dispersion of imposed currents and minimization of raised potentials. Locally raised potentials are calculated in terms of steady state GPR. Transferred potentials to neighboring wind turbines are also computed. Measures taken to reduce potentials are presented and commented upon. For the purposes of this paper the well-known software packages EMTP (Electromagnetic Transients Program) and CYMGRD (CYMe's grounding) have been used.
{"title":"Analysis of wind turbine grounding systems","authors":"M. Lorentzou, N. Hatziargyriou, B. Papadias","doi":"10.1109/MELCON.2000.879686","DOIUrl":"https://doi.org/10.1109/MELCON.2000.879686","url":null,"abstract":"In this paper, the response of wind turbine grounding systems is calculated under fault conditions or when they are hit by lightning. The objective is their effective design in terms of dispersion of imposed currents and minimization of raised potentials. Locally raised potentials are calculated in terms of steady state GPR. Transferred potentials to neighboring wind turbines are also computed. Measures taken to reduce potentials are presented and commented upon. For the purposes of this paper the well-known software packages EMTP (Electromagnetic Transients Program) and CYMGRD (CYMe's grounding) have been used.","PeriodicalId":151424,"journal":{"name":"2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)","volume":"47 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":"130690784","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.2000.879721
D. Stojanovic, M. Veselinović, N. Mitrovic, L. Korunović
The paper gives a qualitative and quantitative analysis of induction motors impact on the current of a three-pole short-circuit. The transient process in the system is described by Park's model of an induction motor. These results are used for checking the simplified engineering calculation. On the example of the thermal power plant with its self-consumption, a comparative analysis is made of calculation results. The paper also tests the behaviour of induction motors during change of voltage at their connection due to faults in the network. The motor behaviour is thereby tested in the direct environment of the fault's location. It has been established that in cases of longer duration of faults, these induction motors unload the fault location and therefore reduce the total fault current.
{"title":"Calculations and analysis of induction motors impact on short-circuit current","authors":"D. Stojanovic, M. Veselinović, N. Mitrovic, L. Korunović","doi":"10.1109/MELCON.2000.879721","DOIUrl":"https://doi.org/10.1109/MELCON.2000.879721","url":null,"abstract":"The paper gives a qualitative and quantitative analysis of induction motors impact on the current of a three-pole short-circuit. The transient process in the system is described by Park's model of an induction motor. These results are used for checking the simplified engineering calculation. On the example of the thermal power plant with its self-consumption, a comparative analysis is made of calculation results. The paper also tests the behaviour of induction motors during change of voltage at their connection due to faults in the network. The motor behaviour is thereby tested in the direct environment of the fault's location. It has been established that in cases of longer duration of faults, these induction motors unload the fault location and therefore reduce the total fault current.","PeriodicalId":151424,"journal":{"name":"2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)","volume":"10 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":"130930436","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.2000.880356
E. Pallarès-Segarra, J. García-Haro
With the integration of different multimedia services and the growing demand of bandwidth, local area networks (LAN) are becoming switched networks. A rigorous and systematic design of switched LAN topologies requires, among other issues, the determination of the capacity of the links connecting the switches to appropriately support the new services. This paper proposes an alternative mathematical methodology to compute the loss probability obtaining more accurate results than other approaches in the related literature. The different services are modeled using different classes of on-off sources and the capacity of the links have to guarantee a given information loss probability constraint.
{"title":"Mathematical approach to designing switched LANs, an alternative solution to compute the loss probability in an heterogeneous traffic environment","authors":"E. Pallarès-Segarra, J. García-Haro","doi":"10.1109/MELCON.2000.880356","DOIUrl":"https://doi.org/10.1109/MELCON.2000.880356","url":null,"abstract":"With the integration of different multimedia services and the growing demand of bandwidth, local area networks (LAN) are becoming switched networks. A rigorous and systematic design of switched LAN topologies requires, among other issues, the determination of the capacity of the links connecting the switches to appropriately support the new services. This paper proposes an alternative mathematical methodology to compute the loss probability obtaining more accurate results than other approaches in the related literature. The different services are modeled using different classes of on-off sources and the capacity of the links have to guarantee a given information loss probability constraint.","PeriodicalId":151424,"journal":{"name":"2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)","volume":"117 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":"132906392","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.2000.880383
A. Granić, V. Glavinic
The goals of human-computer interaction are to provide functional, usable, safe and well designed computer system interfaces, thus achieving almost transparency and enabling end users to fully concentrate on work. Over the years the need has been recognized for the development of adaptive user interfaces in several application areas. Our research is concentrated on adaptive user interfaces for intelligent tutoring systems, which allow human teacher emulation in the process of learning and teaching. In the paper we consider the functionality specification of an intelligent tutoring system user interface expressed by means of user action notation, and discuss the way it has to change the provided functionality and its presentation on the basis of users' individual characteristics, in order to accommodate differing user requirements.
{"title":"Functionality specification for adaptive user interfaces","authors":"A. Granić, V. Glavinic","doi":"10.1109/MELCON.2000.880383","DOIUrl":"https://doi.org/10.1109/MELCON.2000.880383","url":null,"abstract":"The goals of human-computer interaction are to provide functional, usable, safe and well designed computer system interfaces, thus achieving almost transparency and enabling end users to fully concentrate on work. Over the years the need has been recognized for the development of adaptive user interfaces in several application areas. Our research is concentrated on adaptive user interfaces for intelligent tutoring systems, which allow human teacher emulation in the process of learning and teaching. In the paper we consider the functionality specification of an intelligent tutoring system user interface expressed by means of user action notation, and discuss the way it has to change the provided functionality and its presentation on the basis of users' individual characteristics, in order to accommodate differing user requirements.","PeriodicalId":151424,"journal":{"name":"2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)","volume":"30 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":"133412385","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.2000.879741
J. Nazarko, M. El-Saadawi
Optimal scheduling of the hydro-thermal and photovoltaic power systems for long range operation is basically a nonlinear programming problem with a nonlinear objective function and a mixture of linear and nonlinear constraints. Several mathematical techniques are, at present, available for solving the long term operation of hydrothermal systems. Some of these methods were applied to multiple types of generation including nuclear and pumped storage systems. Until now, none of these methods was applied to a system composed of hydrothermal and photovoltaic plants. In this research the minimum norm approach is used to solve the optimal operation of photovoltaic plants integrated with hydro and thermal systems. Economic evaluation of integrating PV plants with an existing electric utility is investigated to achieve the best integrated size of PV plants. The method is applied to actual data of both Egyptian National Utility and Egyptian solar radiation.
{"title":"Economic evaluation of integrating photovoltaic plants with National Egyptian Utility","authors":"J. Nazarko, M. El-Saadawi","doi":"10.1109/MELCON.2000.879741","DOIUrl":"https://doi.org/10.1109/MELCON.2000.879741","url":null,"abstract":"Optimal scheduling of the hydro-thermal and photovoltaic power systems for long range operation is basically a nonlinear programming problem with a nonlinear objective function and a mixture of linear and nonlinear constraints. Several mathematical techniques are, at present, available for solving the long term operation of hydrothermal systems. Some of these methods were applied to multiple types of generation including nuclear and pumped storage systems. Until now, none of these methods was applied to a system composed of hydrothermal and photovoltaic plants. In this research the minimum norm approach is used to solve the optimal operation of photovoltaic plants integrated with hydro and thermal systems. Economic evaluation of integrating PV plants with an existing electric utility is investigated to achieve the best integrated size of PV plants. The method is applied to actual data of both Egyptian National Utility and Egyptian solar radiation.","PeriodicalId":151424,"journal":{"name":"2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)","volume":"13 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":"115394467","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.2000.879982
M. Marolt
This paper presents our experiences in building a system for transcription of polyphonic piano music. By transcription we mean the conversion of an audio recording of a polyphonic piano performance to a series of notes and their starting times. Our final goal is to build a transcription system that would transcribe polyphonic piano music over the entire piano range and with large polyphony. The system consists of three main stages. We first use a cochlear model based on the gammatone filterbank to transform an audio signal of a piano performance into time-frequency space. In the second stage we use a network of coupled adaptive oscillators to extract partial tracks from the output of the cochlear model and in the third stage we employ artificial neural networks acting as pattern recognisers to extract notes from the output of the oscillator network. The system uses several networks each trained to recognize the occurrence of a specific note in the input signal.
{"title":"Transcription of polyphonic piano music with neural networks","authors":"M. Marolt","doi":"10.1109/MELCON.2000.879982","DOIUrl":"https://doi.org/10.1109/MELCON.2000.879982","url":null,"abstract":"This paper presents our experiences in building a system for transcription of polyphonic piano music. By transcription we mean the conversion of an audio recording of a polyphonic piano performance to a series of notes and their starting times. Our final goal is to build a transcription system that would transcribe polyphonic piano music over the entire piano range and with large polyphony. The system consists of three main stages. We first use a cochlear model based on the gammatone filterbank to transform an audio signal of a piano performance into time-frequency space. In the second stage we use a network of coupled adaptive oscillators to extract partial tracks from the output of the cochlear model and in the third stage we employ artificial neural networks acting as pattern recognisers to extract notes from the output of the oscillator network. The system uses several networks each trained to recognize the occurrence of a specific note in the input signal.","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":"115796492","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.2000.879748
E. Karapidakis, N. Hatziargyriou
Isolated electrical power systems face specific problems related to their operation and control. Some of the most important ones are related to the system dynamic stability. It is therefore apparent the need for a fast dynamic security assessment (DSA) function, in order to improve system operation. In this paper ANNs of multilayer perceptron (MLP) architecture are applied for online DSA. It is shown that is proposed for better performance in DSA. The application of this technique on the power system of Crete is shown to provide online maximum frequency deviations and maximum frequency change rates in case of pre-specified contingencies.
{"title":"Application of artificial neural networks for security assessment of medium size power systems","authors":"E. Karapidakis, N. Hatziargyriou","doi":"10.1109/MELCON.2000.879748","DOIUrl":"https://doi.org/10.1109/MELCON.2000.879748","url":null,"abstract":"Isolated electrical power systems face specific problems related to their operation and control. Some of the most important ones are related to the system dynamic stability. It is therefore apparent the need for a fast dynamic security assessment (DSA) function, in order to improve system operation. In this paper ANNs of multilayer perceptron (MLP) architecture are applied for online DSA. It is shown that is proposed for better performance in DSA. The application of this technique on the power system of Crete is shown to provide online maximum frequency deviations and maximum frequency change rates in case of pre-specified contingencies.","PeriodicalId":151424,"journal":{"name":"2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)","volume":"101 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":"124119828","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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