Pub Date : 1989-04-11DOI: 10.1109/MELCON.1989.50083
M. Marchesi, G. Orlandi, F. Piazza
The authors describe work currently being carried out to develop CAD (computer-aided design) tools for network synthesis using object-oriented programming. This work deals with traditional passive linear network synthesis. The mathematical and numerical analysis concepts related to it, namely complex numbers, polynomials, and rational functions, are analyzed, and their object-oriented description is given. The analysis and the proposed object decomposition is then extended to the characteristics and the properties of electric components and circuits. Some examples of applications developed using the defined objects are then given. The data structure developed has been successfully tested in the development of an expert system for linear passive network synthesis.<>
{"title":"Network synthesis using object-oriented programming","authors":"M. Marchesi, G. Orlandi, F. Piazza","doi":"10.1109/MELCON.1989.50083","DOIUrl":"https://doi.org/10.1109/MELCON.1989.50083","url":null,"abstract":"The authors describe work currently being carried out to develop CAD (computer-aided design) tools for network synthesis using object-oriented programming. This work deals with traditional passive linear network synthesis. The mathematical and numerical analysis concepts related to it, namely complex numbers, polynomials, and rational functions, are analyzed, and their object-oriented description is given. The analysis and the proposed object decomposition is then extended to the characteristics and the properties of electric components and circuits. Some examples of applications developed using the defined objects are then given. The data structure developed has been successfully tested in the development of an expert system for linear passive network synthesis.<<ETX>>","PeriodicalId":380214,"journal":{"name":"Proceedings. Electrotechnical Conference Integrating Research, Industry and Education in Energy and Communication Engineering',","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130392741","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 : 1989-04-11DOI: 10.1109/MELCON.1989.50094
S.Z. Budisin
A simple relation between Walsh functions and PN (pseudonoise) sequences is derived. It is shown that by using a suitable permutation a set of discrete Walsh functions-sequences can be transformed into the set of different phase shifts of a single PN sequence. A matched filter-correlator based on the fast Walsh transform (FWT) which exploits this property is proposed. This correlator can be efficiently applied to continuous wave radar signal compression and direct-sequence spread-spectrum code acquisition. This method is shown to be much more efficient than the method based on the FFT (fast Fourier transform), which includes two FFTs and an array multiplication. As opposed to the FFT-based algorithm, the proposed method has no multiplications and the total number of operations is approximately five times smaller. As the number of operations per input samples is small, the proposed algorithm is adequate for LSI implementation even for high bit rates and for long sequences.<>
{"title":"Fast PN sequence correlation by using FWT","authors":"S.Z. Budisin","doi":"10.1109/MELCON.1989.50094","DOIUrl":"https://doi.org/10.1109/MELCON.1989.50094","url":null,"abstract":"A simple relation between Walsh functions and PN (pseudonoise) sequences is derived. It is shown that by using a suitable permutation a set of discrete Walsh functions-sequences can be transformed into the set of different phase shifts of a single PN sequence. A matched filter-correlator based on the fast Walsh transform (FWT) which exploits this property is proposed. This correlator can be efficiently applied to continuous wave radar signal compression and direct-sequence spread-spectrum code acquisition. This method is shown to be much more efficient than the method based on the FFT (fast Fourier transform), which includes two FFTs and an array multiplication. As opposed to the FFT-based algorithm, the proposed method has no multiplications and the total number of operations is approximately five times smaller. As the number of operations per input samples is small, the proposed algorithm is adequate for LSI implementation even for high bit rates and for long sequences.<<ETX>>","PeriodicalId":380214,"journal":{"name":"Proceedings. Electrotechnical Conference Integrating Research, Industry and Education in Energy and Communication Engineering',","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124907731","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 : 1989-04-11DOI: 10.1109/MELCON.1989.50057
M. Karaman, L. Onural, A. Atalar
A general purpose median filter configuration consisting of two single chip median filters is proposed. One of the chips is designed for applications requiring variable word-length and variable window size, whereas the other is for real-time applications. The architectures of the chips are based on odd/even transposition sorting. The chips are implemented in 3- mu m M/sup 2/CMOS using full-custom VLSI design techniques. The chips together with a reasonable external hardware can be used for the realizations of many median filtering techniques. The VLSI design procedure of the chips and their applications to different median filtering techniques for image processing are presented.<>
提出了一种由两个单片中值滤波器组成的通用中值滤波器结构。其中一个芯片是为需要可变字长和可变窗口大小的应用而设计的，而另一个是为实时应用而设计的。芯片的架构基于奇/偶换位排序。这些芯片采用全定制VLSI设计技术，在3 μ m /sup /CMOS中实现。该芯片与合理的外部硬件配合使用，可实现多种中值滤波技术。介绍了该芯片的VLSI设计过程及其在图像处理中不同中值滤波技术中的应用。
{"title":"A general purpose VLSI median filter and its applications for image processing","authors":"M. Karaman, L. Onural, A. Atalar","doi":"10.1109/MELCON.1989.50057","DOIUrl":"https://doi.org/10.1109/MELCON.1989.50057","url":null,"abstract":"A general purpose median filter configuration consisting of two single chip median filters is proposed. One of the chips is designed for applications requiring variable word-length and variable window size, whereas the other is for real-time applications. The architectures of the chips are based on odd/even transposition sorting. The chips are implemented in 3- mu m M/sup 2/CMOS using full-custom VLSI design techniques. The chips together with a reasonable external hardware can be used for the realizations of many median filtering techniques. The VLSI design procedure of the chips and their applications to different median filtering techniques for image processing are presented.<<ETX>>","PeriodicalId":380214,"journal":{"name":"Proceedings. Electrotechnical Conference Integrating Research, Industry and Education in Energy and Communication Engineering',","volume":"90 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125145793","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 : 1989-04-11DOI: 10.1109/MELCON.1989.49998
R. Maimouni, D. Allain, M. Napieralska, H. Tranduc, P. Rossel, C. Cordonnier
Macromodels for the power VDMOS transistor are proposed in order to simulate its switching characteristics. These macromodels use the SPICE model library and are established for low voltage (60 V) as well as high voltage (1000 V) devices. Three VDMOS power transistor models have been proposed for the simulation of switching circuits. These have been validated by simulation of some energy conversion systems. One of the proposed models takes into account the effect of temperature on the variations of the device parameters.<>
{"title":"Model library for power MOSFETS in switching circuits and converters","authors":"R. Maimouni, D. Allain, M. Napieralska, H. Tranduc, P. Rossel, C. Cordonnier","doi":"10.1109/MELCON.1989.49998","DOIUrl":"https://doi.org/10.1109/MELCON.1989.49998","url":null,"abstract":"Macromodels for the power VDMOS transistor are proposed in order to simulate its switching characteristics. These macromodels use the SPICE model library and are established for low voltage (60 V) as well as high voltage (1000 V) devices. Three VDMOS power transistor models have been proposed for the simulation of switching circuits. These have been validated by simulation of some energy conversion systems. One of the proposed models takes into account the effect of temperature on the variations of the device parameters.<<ETX>>","PeriodicalId":380214,"journal":{"name":"Proceedings. Electrotechnical Conference Integrating Research, Industry and Education in Energy and Communication Engineering',","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123171931","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 : 1989-04-11DOI: 10.1109/MELCON.1989.50067
C. Sa da Costa, T. Rocha da Silva, M. Nunes
The development of a network for emergency calls for highways of up to several hundred kilometers is discussed. The system has a bus structure allowing digital transmission of voice and data at low speed and with enough quality for this kind of application. The overall architecture and the operational features of this network are described. Particular attention is given to voice encoding, the communication protocol, and the message structure.<>
{"title":"SOS-a network for emergency communications","authors":"C. Sa da Costa, T. Rocha da Silva, M. Nunes","doi":"10.1109/MELCON.1989.50067","DOIUrl":"https://doi.org/10.1109/MELCON.1989.50067","url":null,"abstract":"The development of a network for emergency calls for highways of up to several hundred kilometers is discussed. The system has a bus structure allowing digital transmission of voice and data at low speed and with enough quality for this kind of application. The overall architecture and the operational features of this network are described. Particular attention is given to voice encoding, the communication protocol, and the message structure.<<ETX>>","PeriodicalId":380214,"journal":{"name":"Proceedings. Electrotechnical Conference Integrating Research, Industry and Education in Energy and Communication Engineering',","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114313467","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 : 1989-04-11DOI: 10.1109/MELCON.1989.50008
M. Milanović, K. Jezernik, A. Planinc, M. Globevnik
The authors describe cascade self-tuning DC motor current and speed controllers. They assume a DC motor to be a plant with unknown but constant parameters. On the basis of the estimated plant parameters, they design a controller and then realize the control loop. Plant parameters are estimated on the basis of manipulation of mean values of armature voltage, armature current, and angular speed. Simulation results confirm the effectiveness of the proposed method when combined with controller synthesis by pole assignment. Linearization of the thyristor static characteristic led to an improvement in control.<>
{"title":"Self-tuning control for SCR motor drive","authors":"M. Milanović, K. Jezernik, A. Planinc, M. Globevnik","doi":"10.1109/MELCON.1989.50008","DOIUrl":"https://doi.org/10.1109/MELCON.1989.50008","url":null,"abstract":"The authors describe cascade self-tuning DC motor current and speed controllers. They assume a DC motor to be a plant with unknown but constant parameters. On the basis of the estimated plant parameters, they design a controller and then realize the control loop. Plant parameters are estimated on the basis of manipulation of mean values of armature voltage, armature current, and angular speed. Simulation results confirm the effectiveness of the proposed method when combined with controller synthesis by pole assignment. Linearization of the thyristor static characteristic led to an improvement in control.<<ETX>>","PeriodicalId":380214,"journal":{"name":"Proceedings. Electrotechnical Conference Integrating Research, Industry and Education in Energy and Communication Engineering',","volume":"85 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114170844","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 : 1989-04-11DOI: 10.1109/MELCON.1989.50098
E. Sousa
The author considers a multiple access communication system using direct-sequence spread-spectrum signaling as in a terrestrial packet radio network or a multiple-access satellite channel. A technique to characterize multiuser interference and background noise is introduced, and packet error probabilities are calculated. The multiuser interference over a packet in the network is modeled as a compound Gaussian multivariate random variable for moderate to large values of the processing gain. The conditional variance is dependent on the number of users and their interference powers. The best performance results, in terms of the expected total interference power, are obtained for the case of a large number of interferers with comparable interference powers. For small values of SNR (signal-to-noise ratio) the probability of error is smaller than that corresponding to Gaussian noise, and for large values of SNR it is larger.<>
{"title":"Packet error probability calculation in a direct sequence spread spectrum network","authors":"E. Sousa","doi":"10.1109/MELCON.1989.50098","DOIUrl":"https://doi.org/10.1109/MELCON.1989.50098","url":null,"abstract":"The author considers a multiple access communication system using direct-sequence spread-spectrum signaling as in a terrestrial packet radio network or a multiple-access satellite channel. A technique to characterize multiuser interference and background noise is introduced, and packet error probabilities are calculated. The multiuser interference over a packet in the network is modeled as a compound Gaussian multivariate random variable for moderate to large values of the processing gain. The conditional variance is dependent on the number of users and their interference powers. The best performance results, in terms of the expected total interference power, are obtained for the case of a large number of interferers with comparable interference powers. For small values of SNR (signal-to-noise ratio) the probability of error is smaller than that corresponding to Gaussian noise, and for large values of SNR it is larger.<<ETX>>","PeriodicalId":380214,"journal":{"name":"Proceedings. Electrotechnical Conference Integrating Research, Industry and Education in Energy and Communication Engineering',","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122563123","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 : 1989-04-11DOI: 10.1109/MELCON.1989.50157
Y. Rahim, A. Alolah
The authors describe the process of updating and renewing the electrical machine laboratory at King Saud University that accompanied the movement of the University to its new campus at Dhareya. Particular attention is given to the old equipment that has been preserved and to the potential of the new equipment. It is noted that the research facilities may be improved if a computer system is introduced in the lab. Also, the solid-state drive facilities may be improved by the introduction of a 400 Hz generator.<>
{"title":"Developments in the electrical machine laboratory at King Saud University","authors":"Y. Rahim, A. Alolah","doi":"10.1109/MELCON.1989.50157","DOIUrl":"https://doi.org/10.1109/MELCON.1989.50157","url":null,"abstract":"The authors describe the process of updating and renewing the electrical machine laboratory at King Saud University that accompanied the movement of the University to its new campus at Dhareya. Particular attention is given to the old equipment that has been preserved and to the potential of the new equipment. It is noted that the research facilities may be improved if a computer system is introduced in the lab. Also, the solid-state drive facilities may be improved by the introduction of a 400 Hz generator.<<ETX>>","PeriodicalId":380214,"journal":{"name":"Proceedings. Electrotechnical Conference Integrating Research, Industry and Education in Energy and Communication Engineering',","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130071435","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 : 1989-04-11DOI: 10.1109/MELCON.1989.49970
F. Mocci, M. Tosi
The different basic topologies of DC/DC converters (buck, boost, and buck-boost) are compared with a view to their use in PV (photovoltaic) systems, where maximum power tracking of the PV array is required as climatic conditions and load vary, in order to optimize the efficiency of the conversion chain. The existence of dissipative elements in a real converter is taken into account in order to assess the efficiency obtainable with varying modulation parameters. Efficiency expressions are found for the three basic converter types used in such applications. It is found that the nature of the load plays a decisive role in the choice of topology. Where the load it inductive, as is the case for motors, the most suitable converter appears to be the buck type. In the other cases the choice is more complex and a careful analysis is required in order to find the optimum solution. The frequency ranges and semiconductor devices most suited to the different applications are briefly discussed. The possibility of using resonant and quasi-resonant conversion techniques for particular applications with high operating frequencies and lightweight equipment is examined.<>
{"title":"Comparison of power converter technologies in photovoltaic applications","authors":"F. Mocci, M. Tosi","doi":"10.1109/MELCON.1989.49970","DOIUrl":"https://doi.org/10.1109/MELCON.1989.49970","url":null,"abstract":"The different basic topologies of DC/DC converters (buck, boost, and buck-boost) are compared with a view to their use in PV (photovoltaic) systems, where maximum power tracking of the PV array is required as climatic conditions and load vary, in order to optimize the efficiency of the conversion chain. The existence of dissipative elements in a real converter is taken into account in order to assess the efficiency obtainable with varying modulation parameters. Efficiency expressions are found for the three basic converter types used in such applications. It is found that the nature of the load plays a decisive role in the choice of topology. Where the load it inductive, as is the case for motors, the most suitable converter appears to be the buck type. In the other cases the choice is more complex and a careful analysis is required in order to find the optimum solution. The frequency ranges and semiconductor devices most suited to the different applications are briefly discussed. The possibility of using resonant and quasi-resonant conversion techniques for particular applications with high operating frequencies and lightweight equipment is examined.<<ETX>>","PeriodicalId":380214,"journal":{"name":"Proceedings. Electrotechnical Conference Integrating Research, Industry and Education in Energy and Communication Engineering',","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126611566","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 : 1989-04-11DOI: 10.1109/MELCON.1989.50011
R. Cusani
Two multiplication-free correlators (the hybrid sign and polarity coincidence correlators) are analyzed as fast alternatives to the direct multiply-and-accumulate technique in time delay measurements. Their accuracy limits are given for general signal and noise spectra and their dependence on signal-to-noise ratio (SNR), observation interval, and signal bandwidth is analyzed for a reference case, PC (polarity coincidence) variance has been verified to decrease uniformly with increasing SNR while HS (hybrid sign) variance does not. PC is verified to be a powerful tool if a certain loss in accuracy can be tolerated or recovered by properly enlarging the observation interval.<>
{"title":"Fast techniques for time delay estimation","authors":"R. Cusani","doi":"10.1109/MELCON.1989.50011","DOIUrl":"https://doi.org/10.1109/MELCON.1989.50011","url":null,"abstract":"Two multiplication-free correlators (the hybrid sign and polarity coincidence correlators) are analyzed as fast alternatives to the direct multiply-and-accumulate technique in time delay measurements. Their accuracy limits are given for general signal and noise spectra and their dependence on signal-to-noise ratio (SNR), observation interval, and signal bandwidth is analyzed for a reference case, PC (polarity coincidence) variance has been verified to decrease uniformly with increasing SNR while HS (hybrid sign) variance does not. PC is verified to be a powerful tool if a certain loss in accuracy can be tolerated or recovered by properly enlarging the observation interval.<<ETX>>","PeriodicalId":380214,"journal":{"name":"Proceedings. Electrotechnical Conference Integrating Research, Industry and Education in Energy and Communication Engineering',","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129191736","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：