Pub Date : 1994-03-29DOI: 10.1109/SOUTHC.1994.498168
M. Zaki, A. Bonsall, I. Batarseh
This paper presents a new circuit topology known as series-parallel resonant converter (SPRC), which is a combination of both the series resonant converter (SRC) and the parallel resonant converter (PRC) topologies. This topology has several advantages when compared to the individual SRC and PRC. For example, the SPRC can operate under open load conditions, and it allows for zero-current switching operation. Using the steepest descent algorithm, the state-plane equations are numerically solved to obtain the performance characteristic curves. Based on these curves, a converter design procedure can be devised. A specific design example is given.
{"title":"Performance characteristics for the series-parallel resonant converter","authors":"M. Zaki, A. Bonsall, I. Batarseh","doi":"10.1109/SOUTHC.1994.498168","DOIUrl":"https://doi.org/10.1109/SOUTHC.1994.498168","url":null,"abstract":"This paper presents a new circuit topology known as series-parallel resonant converter (SPRC), which is a combination of both the series resonant converter (SRC) and the parallel resonant converter (PRC) topologies. This topology has several advantages when compared to the individual SRC and PRC. For example, the SPRC can operate under open load conditions, and it allows for zero-current switching operation. Using the steepest descent algorithm, the state-plane equations are numerically solved to obtain the performance characteristic curves. Based on these curves, a converter design procedure can be devised. A specific design example is given.","PeriodicalId":164672,"journal":{"name":"Conference Record Southcon","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117009266","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 : 1994-03-29DOI: 10.1109/SOUTHC.1994.498069
J. Bezdek
The author shows one of many ways to build a hybrid model for fuzzy control that uses fuzzy clustering and CNNs as tools. Neither fuzzy control nor CNNs are well-aged, but they are mature enough to bear fruit. Hybrid models can and will have properties that their progenitors do not possess. Not all hybrids will be good, so many testing and evaluation will be necessary.
{"title":"Hybrid fuzzy controller designs that use pattern recognition and neural networks","authors":"J. Bezdek","doi":"10.1109/SOUTHC.1994.498069","DOIUrl":"https://doi.org/10.1109/SOUTHC.1994.498069","url":null,"abstract":"The author shows one of many ways to build a hybrid model for fuzzy control that uses fuzzy clustering and CNNs as tools. Neither fuzzy control nor CNNs are well-aged, but they are mature enough to bear fruit. Hybrid models can and will have properties that their progenitors do not possess. Not all hybrids will be good, so many testing and evaluation will be necessary.","PeriodicalId":164672,"journal":{"name":"Conference Record Southcon","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130254320","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 : 1994-03-29DOI: 10.1109/SOUTHC.1994.498115
D. S. Dunn, E. P. Augustin, Chin Chang
The theoretical resonant length and experimental normalized conductance of inclined slots are applied in the design of an X-band edge slot waveguide array antenna over the frequency range of 9.5 to 10.5 GHz. The array consists of eight radiating slots machined in the narrow wall of a WR90 waveguide. The array has a non-uniform amplitude distribution with all of the elements fed in-phase. Since the array consists of only eight elements, each element contributes significantly to the overall antenna's characteristics. Experimental results of the measured slot conductances and a formula for the slot depth, including the waveguide wall thickness, for any slot orientation less than 46.6/spl deg/ is presented. This data was used to determine the amplitude distribution and configuration for each element of the array. Measured radiation patterns are presented and characteristics of the antenna examined.
{"title":"Design of an eight element edge slot waveguide array antenna","authors":"D. S. Dunn, E. P. Augustin, Chin Chang","doi":"10.1109/SOUTHC.1994.498115","DOIUrl":"https://doi.org/10.1109/SOUTHC.1994.498115","url":null,"abstract":"The theoretical resonant length and experimental normalized conductance of inclined slots are applied in the design of an X-band edge slot waveguide array antenna over the frequency range of 9.5 to 10.5 GHz. The array consists of eight radiating slots machined in the narrow wall of a WR90 waveguide. The array has a non-uniform amplitude distribution with all of the elements fed in-phase. Since the array consists of only eight elements, each element contributes significantly to the overall antenna's characteristics. Experimental results of the measured slot conductances and a formula for the slot depth, including the waveguide wall thickness, for any slot orientation less than 46.6/spl deg/ is presented. This data was used to determine the amplitude distribution and configuration for each element of the array. Measured radiation patterns are presented and characteristics of the antenna examined.","PeriodicalId":164672,"journal":{"name":"Conference Record Southcon","volume":"23 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120894982","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 : 1994-03-29DOI: 10.1109/SOUTHC.1994.498081
J. W. Howse, C. Abdallah, G. Heileman, M. Georgiopoulos
This paper reviews a formalism that enables the dynamics of a broad class of neural networks to be understood. This formalism is then applied to a specific network and the predicted and simulated behavior of the system are compared. The purpose of this work is to utilise a model of the dynamics that also describes the phase space behavior and structural stability of the system. This is achieved by writing the general equations of the neural network dynamics as a gradient-like system. In this paper it is demonstrated that a network with additive activation dynamics and Hebbian weight update dynamics can be expressed as a gradient-like system. An example of an S-layer network with feedback between adjacent layers is presented. It is shown that the process of weight learning is stable in this network when the learned weights are symmetric. Furthermore, the weight learning process is stable when the learned weights are asymmetric, provided that the activation is computed using only the symmetric part of the weights.
{"title":"An application of gradient-like dynamics to neural networks","authors":"J. W. Howse, C. Abdallah, G. Heileman, M. Georgiopoulos","doi":"10.1109/SOUTHC.1994.498081","DOIUrl":"https://doi.org/10.1109/SOUTHC.1994.498081","url":null,"abstract":"This paper reviews a formalism that enables the dynamics of a broad class of neural networks to be understood. This formalism is then applied to a specific network and the predicted and simulated behavior of the system are compared. The purpose of this work is to utilise a model of the dynamics that also describes the phase space behavior and structural stability of the system. This is achieved by writing the general equations of the neural network dynamics as a gradient-like system. In this paper it is demonstrated that a network with additive activation dynamics and Hebbian weight update dynamics can be expressed as a gradient-like system. An example of an S-layer network with feedback between adjacent layers is presented. It is shown that the process of weight learning is stable in this network when the learned weights are symmetric. Furthermore, the weight learning process is stable when the learned weights are asymmetric, provided that the activation is computed using only the symmetric part of the weights.","PeriodicalId":164672,"journal":{"name":"Conference Record Southcon","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116254283","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 : 1994-03-29DOI: 10.1109/SOUTHC.1994.498092
C. Panchapakesan, J. Yuan
The thermal behavior of AlGaAs/GaAs HBT was analyzed. The thermal stability improves with increasing Al mole fraction. The turn-on voltage of the device increases as the mole fraction which results in less power dissipation and hence better thermal stability. Two dimensional analysis shows much reduced temperatures compared to 1D since it accommodates the lateral dissipation of heat. Multi-emitter finger heterojunction transistor exhibits non-uniform temperature distribution across the device. To reduce the peak temperatures, device layouts with narrower emitters and/or wider spacing between the emitters are used.
{"title":"Evaluation of aluminum mole fraction for controlled thermal behavior of AlGaAs/GaAs HBT","authors":"C. Panchapakesan, J. Yuan","doi":"10.1109/SOUTHC.1994.498092","DOIUrl":"https://doi.org/10.1109/SOUTHC.1994.498092","url":null,"abstract":"The thermal behavior of AlGaAs/GaAs HBT was analyzed. The thermal stability improves with increasing Al mole fraction. The turn-on voltage of the device increases as the mole fraction which results in less power dissipation and hence better thermal stability. Two dimensional analysis shows much reduced temperatures compared to 1D since it accommodates the lateral dissipation of heat. Multi-emitter finger heterojunction transistor exhibits non-uniform temperature distribution across the device. To reduce the peak temperatures, device layouts with narrower emitters and/or wider spacing between the emitters are used.","PeriodicalId":164672,"journal":{"name":"Conference Record Southcon","volume":"495 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122755000","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 : 1994-03-29DOI: 10.1109/SOUTHC.1994.498065
A. Gregg, G. Kaelin
This paper covers the Space Station Freedom electrical power system (EPS) design and shows how the application of that technology in aircraft (and other vehicles) electrical power distribution systems can reduce weight and volume, and improve reliability and maintainability. The design and development of the Space Station EPS was a major milestone in large-scale space power management and distribution. The challenge of distributing 100 kW of high-voltage DC power throughout the huge space vehicle led to the hardware development and testing of extremely reliable, lightweight, remotely controlled switchgear. This technology has been shown to be directly applicable in the electrical power management and distribution designs for such vehicles as commercial and military aircraft and ships.
{"title":"Space Station Freedom, technology applications in vehicle electrical power systems","authors":"A. Gregg, G. Kaelin","doi":"10.1109/SOUTHC.1994.498065","DOIUrl":"https://doi.org/10.1109/SOUTHC.1994.498065","url":null,"abstract":"This paper covers the Space Station Freedom electrical power system (EPS) design and shows how the application of that technology in aircraft (and other vehicles) electrical power distribution systems can reduce weight and volume, and improve reliability and maintainability. The design and development of the Space Station EPS was a major milestone in large-scale space power management and distribution. The challenge of distributing 100 kW of high-voltage DC power throughout the huge space vehicle led to the hardware development and testing of extremely reliable, lightweight, remotely controlled switchgear. This technology has been shown to be directly applicable in the electrical power management and distribution designs for such vehicles as commercial and military aircraft and ships.","PeriodicalId":164672,"journal":{"name":"Conference Record Southcon","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126662701","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 : 1994-03-29DOI: 10.1109/SOUTHC.1994.498169
J.T. Smith, H.K. Brown
In this paper, the development of a mixed-signal circuit simulation system with behavioral modeling capability is discussed. In this context, mixed-signal simulation refers to the simulation of circuits and systems containing both analog and digital cells excited with signals of either an analog or digital nature. The background information regarding circuit simulation is given along with a discussion of device and system modeling for analog and digital cells. In addition, the numerical methods and programming techniques along with how these relate to the internal data structure are analyzed. Finally, the scenarios used for testing the simulator are discussed and the results compared to results obtained from the SPICE simulator using device based models. The development of this simulation system has provided a seamless method for developing behavioral models given a cell which has been well characterized. These behavioral models are developed utilizing object-oriented programming techniques and are capable of providing highly accurate results. Behavioral cells, once developed, can then be simulated with signals and cells of an analog or digital nature to provide significant improvements in simulation times of large systems.
{"title":"Mixed-signal circuit simulation system with behavioral modeling capability","authors":"J.T. Smith, H.K. Brown","doi":"10.1109/SOUTHC.1994.498169","DOIUrl":"https://doi.org/10.1109/SOUTHC.1994.498169","url":null,"abstract":"In this paper, the development of a mixed-signal circuit simulation system with behavioral modeling capability is discussed. In this context, mixed-signal simulation refers to the simulation of circuits and systems containing both analog and digital cells excited with signals of either an analog or digital nature. The background information regarding circuit simulation is given along with a discussion of device and system modeling for analog and digital cells. In addition, the numerical methods and programming techniques along with how these relate to the internal data structure are analyzed. Finally, the scenarios used for testing the simulator are discussed and the results compared to results obtained from the SPICE simulator using device based models. The development of this simulation system has provided a seamless method for developing behavioral models given a cell which has been well characterized. These behavioral models are developed utilizing object-oriented programming techniques and are capable of providing highly accurate results. Behavioral cells, once developed, can then be simulated with signals and cells of an analog or digital nature to provide significant improvements in simulation times of large systems.","PeriodicalId":164672,"journal":{"name":"Conference Record Southcon","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131960241","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 : 1994-03-29DOI: 10.1109/SOUTHC.1994.498108
P. Wahid, C. Christodoulou
There are serious concerns among the public and utility companies over the possible health effects of electric and magnetic fields. Electric and magnetic fields produced by electric power systems have been added to the list of environmental factors that are a potential threat to humans. This paper is an overview of various issues related to the exposure to low frequency electric and magnetic fields presented in the literature. The biological effects of these fields, mitigation procedures and techniques for shielding the magnetic fields are presented.
{"title":"Overview of issues relating to low frequency electric and magnetic fields","authors":"P. Wahid, C. Christodoulou","doi":"10.1109/SOUTHC.1994.498108","DOIUrl":"https://doi.org/10.1109/SOUTHC.1994.498108","url":null,"abstract":"There are serious concerns among the public and utility companies over the possible health effects of electric and magnetic fields. Electric and magnetic fields produced by electric power systems have been added to the list of environmental factors that are a potential threat to humans. This paper is an overview of various issues related to the exposure to low frequency electric and magnetic fields presented in the literature. The biological effects of these fields, mitigation procedures and techniques for shielding the magnetic fields are presented.","PeriodicalId":164672,"journal":{"name":"Conference Record Southcon","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132626344","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 : 1994-03-29DOI: 10.1109/SOUTHC.1994.498141
S. Chatterjee
Recent advances in fiber optics and data compression technologies have resulted in the realization of very high-speed communication networks. These networks are being designed to carry a wide variety of traffic types including voice, video and multimedia data. This paper discusses the many challenges and issues involved in realizing a broadband multimedia network. A possible scenario of ATM-based B-ISDN is given. The design of a new transmission scheduling mechanism that not only guarantees QOS requirements for the different traffic classes, but can also transport bursts of sessions as a whole, thereby preserving integrity of user talkspurt in a bursty traffic environment, is presented. Simulation results demonstrate the feasibility of the scheme.
{"title":"Realizing a multimedia broadband integrated network","authors":"S. Chatterjee","doi":"10.1109/SOUTHC.1994.498141","DOIUrl":"https://doi.org/10.1109/SOUTHC.1994.498141","url":null,"abstract":"Recent advances in fiber optics and data compression technologies have resulted in the realization of very high-speed communication networks. These networks are being designed to carry a wide variety of traffic types including voice, video and multimedia data. This paper discusses the many challenges and issues involved in realizing a broadband multimedia network. A possible scenario of ATM-based B-ISDN is given. The design of a new transmission scheduling mechanism that not only guarantees QOS requirements for the different traffic classes, but can also transport bursts of sessions as a whole, thereby preserving integrity of user talkspurt in a bursty traffic environment, is presented. Simulation results demonstrate the feasibility of the scheme.","PeriodicalId":164672,"journal":{"name":"Conference Record Southcon","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133555014","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}
Metallic gratings have long been used as frequency selective surfaces for applications ranging from beam splitters to polarization filters. These gratings are generally modeled as an infinite array of evenly spaced metallic strips. These structures are usually modeled by assuming that each of the strips in the grating has an infinite conductivity or that all strips are made of the same finite conductivity. An analytical method, based on the electric field integral equation and the method of moments, is developed in which the conductivity of each strip is taken into account. Various strip conductivity profiles are analyzed for their effect on the radar cross section area (RCS). The induced currents on each strip are solved to calculate the scattered field.
{"title":"Scattering from metallic gratings made of various strip conductivity profiles","authors":"C. Christodoulou, P. Wahid, F. Grey","doi":"10.1163/156939394X00047","DOIUrl":"https://doi.org/10.1163/156939394X00047","url":null,"abstract":"Metallic gratings have long been used as frequency selective surfaces for applications ranging from beam splitters to polarization filters. These gratings are generally modeled as an infinite array of evenly spaced metallic strips. These structures are usually modeled by assuming that each of the strips in the grating has an infinite conductivity or that all strips are made of the same finite conductivity. An analytical method, based on the electric field integral equation and the method of moments, is developed in which the conductivity of each strip is taken into account. Various strip conductivity profiles are analyzed for their effect on the radar cross section area (RCS). The induced currents on each strip are solved to calculate the scattered field.","PeriodicalId":164672,"journal":{"name":"Conference Record Southcon","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131120445","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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