Pub Date : 1998-04-24DOI: 10.1109/SECON.1998.673370
G. Zhou, Huai Wei, P. Kornetzky, I. Batarseh
A PWM switch large signal model for a flyback converter having arbitrary transformer polarity is presented. This model will preserve the input-output property regardless of the transformer polarity. A small signal model for a novel one-stage, switched-mode power factor correction (PFC) converter is also presented in this paper. The model is obtained by applying the small signal perturbation technique to the circuit equations derived from the state-space averaging method. It is shown that this converter exhibits the characteristics of a second order low-pass system for the output-to-input transfer function, and that of a combined second order low-pass and band-pass system for the output-to-control transfer function. The validity of the derived mathematical model was verified by the given experimental results.
{"title":"Dynamic modeling of a single-switch power factor correction circuit","authors":"G. Zhou, Huai Wei, P. Kornetzky, I. Batarseh","doi":"10.1109/SECON.1998.673370","DOIUrl":"https://doi.org/10.1109/SECON.1998.673370","url":null,"abstract":"A PWM switch large signal model for a flyback converter having arbitrary transformer polarity is presented. This model will preserve the input-output property regardless of the transformer polarity. A small signal model for a novel one-stage, switched-mode power factor correction (PFC) converter is also presented in this paper. The model is obtained by applying the small signal perturbation technique to the circuit equations derived from the state-space averaging method. It is shown that this converter exhibits the characteristics of a second order low-pass system for the output-to-input transfer function, and that of a combined second order low-pass and band-pass system for the output-to-control transfer function. The validity of the derived mathematical model was verified by the given experimental results.","PeriodicalId":281991,"journal":{"name":"Proceedings IEEE Southeastcon '98 'Engineering for a New Era'","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130268785","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 : 1998-04-24DOI: 10.1109/SECON.1998.673320
C. H. Huang, Zhi-Ming Lin, Wen Whe Sue
In this paper we present the design of a CMOS voltage-controlled oscillator. The circuit is designed based on a 0.6 /spl mu/m spdm CMOS technology. We use NMOS devices as variable capacitors for the implementation of negative impedance to achieve circuit oscillation. The control voltage of the circuit is ranged from 0 to 3 volts. The circuit oscillates at 1 GHz frequency.
本文设计了一种CMOS压控振荡器。该电路是基于0.6 /spl μ m spdm CMOS技术设计的。我们使用NMOS器件作为可变电容来实现负阻抗以实现电路振荡。电路的控制电压范围为0 ~ 3伏。电路以1ghz的频率振荡。
{"title":"An 1-GHz CMOS voltage-controlled oscillator","authors":"C. H. Huang, Zhi-Ming Lin, Wen Whe Sue","doi":"10.1109/SECON.1998.673320","DOIUrl":"https://doi.org/10.1109/SECON.1998.673320","url":null,"abstract":"In this paper we present the design of a CMOS voltage-controlled oscillator. The circuit is designed based on a 0.6 /spl mu/m spdm CMOS technology. We use NMOS devices as variable capacitors for the implementation of negative impedance to achieve circuit oscillation. The control voltage of the circuit is ranged from 0 to 3 volts. The circuit oscillates at 1 GHz frequency.","PeriodicalId":281991,"journal":{"name":"Proceedings IEEE Southeastcon '98 'Engineering for a New Era'","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127457801","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 : 1998-04-24DOI: 10.1109/SECON.1998.673277
K. J. Cronin, D. G. Linton
A key aspect of effective software development is the ability to quantify and predict software product quality. Software quality is the degree to which software possesses desired attributes, including portability, reliability, testability and maintainability. Insofar as software with high change traffic affects its maintainability and reliability, a model which produces a change-traffic predictor metric may be useful. The information such a model would provide could be used to help estimate the development cost and effort. Resources could be better allocated to those areas where additional attention may be required. Software changes normally occur due to new requirements or errors in the software, and so a change-traffic metric is not necessarily a good proxy for errors. Users should define their thresholds and ranges of acceptability. This paper identifies metrics collected from embedded Ada software that had a correlation with the change traffic of that software. Using multiple linear regression analysis and sample data from up to 287 embedded Ada software modules, change prediction models yielded values for the average absolute difference between predicted and actual changes per module of less than 3, and an adjusted-R/sup 2/ value of 0.57 for the full sample.
{"title":"A change prediction model for embedded software applications","authors":"K. J. Cronin, D. G. Linton","doi":"10.1109/SECON.1998.673277","DOIUrl":"https://doi.org/10.1109/SECON.1998.673277","url":null,"abstract":"A key aspect of effective software development is the ability to quantify and predict software product quality. Software quality is the degree to which software possesses desired attributes, including portability, reliability, testability and maintainability. Insofar as software with high change traffic affects its maintainability and reliability, a model which produces a change-traffic predictor metric may be useful. The information such a model would provide could be used to help estimate the development cost and effort. Resources could be better allocated to those areas where additional attention may be required. Software changes normally occur due to new requirements or errors in the software, and so a change-traffic metric is not necessarily a good proxy for errors. Users should define their thresholds and ranges of acceptability. This paper identifies metrics collected from embedded Ada software that had a correlation with the change traffic of that software. Using multiple linear regression analysis and sample data from up to 287 embedded Ada software modules, change prediction models yielded values for the average absolute difference between predicted and actual changes per module of less than 3, and an adjusted-R/sup 2/ value of 0.57 for the full sample.","PeriodicalId":281991,"journal":{"name":"Proceedings IEEE Southeastcon '98 'Engineering for a New Era'","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116355262","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 : 1998-04-24DOI: 10.1109/SECON.1998.673294
S. Nagarajan, R. Sankar
In linear predictive coding (LPC) analysis, the linear predictors are computed using the classical Levinson-Durbin algorithm. But the Levinson-Durbin algorithm is a processing bottleneck as it involves the addition of inner products in the calculation of the reflection coefficients. This paper develops and reports on modifications to the algorithm used in various speech processing and coding applications for efficient implementations.
{"title":"Efficient implementation of linear predictive coding algorithms","authors":"S. Nagarajan, R. Sankar","doi":"10.1109/SECON.1998.673294","DOIUrl":"https://doi.org/10.1109/SECON.1998.673294","url":null,"abstract":"In linear predictive coding (LPC) analysis, the linear predictors are computed using the classical Levinson-Durbin algorithm. But the Levinson-Durbin algorithm is a processing bottleneck as it involves the addition of inner products in the calculation of the reflection coefficients. This paper develops and reports on modifications to the algorithm used in various speech processing and coding applications for efficient implementations.","PeriodicalId":281991,"journal":{"name":"Proceedings IEEE Southeastcon '98 'Engineering for a New Era'","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115429891","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 : 1998-04-24DOI: 10.1109/SECON.1998.673342
G.G. McEachron
The Ku-band SeaWinds scatterometer, developed for NASA's Jet Propulsion Laboratory, is part of the Earth Observing System which will measure global environmental changes. Scheduled for launch on the Japanese Advanced Earth Observing Satellite (ADEOS) in the year 2000, the instrument measures wind data over the Earth's ice-free oceans every day. The development of the 110 watt peak power radar involved many design trade-offs including the temperature performance. A passive thermal control system, providing a narrow band temperature response in all orbit environments, was necessary to maintain stable radar calibration over a three-year operating life. This paper describes the evolution of the thermal control system design and test validation for the scatterometer electronics subassembly (SES).
{"title":"SeaWinds scatterometer instrument thermal control system","authors":"G.G. McEachron","doi":"10.1109/SECON.1998.673342","DOIUrl":"https://doi.org/10.1109/SECON.1998.673342","url":null,"abstract":"The Ku-band SeaWinds scatterometer, developed for NASA's Jet Propulsion Laboratory, is part of the Earth Observing System which will measure global environmental changes. Scheduled for launch on the Japanese Advanced Earth Observing Satellite (ADEOS) in the year 2000, the instrument measures wind data over the Earth's ice-free oceans every day. The development of the 110 watt peak power radar involved many design trade-offs including the temperature performance. A passive thermal control system, providing a narrow band temperature response in all orbit environments, was necessary to maintain stable radar calibration over a three-year operating life. This paper describes the evolution of the thermal control system design and test validation for the scatterometer electronics subassembly (SES).","PeriodicalId":281991,"journal":{"name":"Proceedings IEEE Southeastcon '98 'Engineering for a New Era'","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123770960","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 : 1998-04-24DOI: 10.1109/SECON.1998.673379
J. A. Wicks, J. Armstrong
Due to the great complexity of VHDL models that are created today, the amount of CPU time required to simulate these models and the amount of labor required to develop these models have become critical issues. The amount of CPU time required to simulate a model can be directly influenced by the efficient use of VHDL concepts in creating the model. Research in the determination of what VHDL concepts and modeling styles are most efficient will be discussed in this paper. The development of tests that can be run on VHDL models to reveal the efficiency of the code in the form of a numerical efficiency rating will also be discussed.
{"title":"Efficiency ratings for VHDL behavioral models","authors":"J. A. Wicks, J. Armstrong","doi":"10.1109/SECON.1998.673379","DOIUrl":"https://doi.org/10.1109/SECON.1998.673379","url":null,"abstract":"Due to the great complexity of VHDL models that are created today, the amount of CPU time required to simulate these models and the amount of labor required to develop these models have become critical issues. The amount of CPU time required to simulate a model can be directly influenced by the efficient use of VHDL concepts in creating the model. Research in the determination of what VHDL concepts and modeling styles are most efficient will be discussed in this paper. The development of tests that can be run on VHDL models to reveal the efficiency of the code in the form of a numerical efficiency rating will also be discussed.","PeriodicalId":281991,"journal":{"name":"Proceedings IEEE Southeastcon '98 'Engineering for a New Era'","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128284312","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 : 1998-04-24DOI: 10.1109/SECON.1998.673312
P. Golla, E. C. Lin
Conventional scalar architectures such as the superscalar or multiscalar architectures execute from a single stream, while a multithreaded architecture executes from multiple streams at a time. Several aggressive branch predictors have been proposed with high prediction accuracies but none of them can provide 100% accuracy. We show that multithreaded architecture is a better candidate for utilizing speculative execution than scalar architectures. Generally the branch prediction performance degradation is compounded for larger window sizes on scalar architectures, while for a multithreaded architecture, by increasing the number of executing threads, we could sustain a higher performance for a large aggregated speculative window size. Hence, heavier workloads may increase performance and utilization for multithreaded architectures. We present analytical and simulation results to support our argument.
{"title":"Limitation of branch predictors: a case for multithreaded architectures","authors":"P. Golla, E. C. Lin","doi":"10.1109/SECON.1998.673312","DOIUrl":"https://doi.org/10.1109/SECON.1998.673312","url":null,"abstract":"Conventional scalar architectures such as the superscalar or multiscalar architectures execute from a single stream, while a multithreaded architecture executes from multiple streams at a time. Several aggressive branch predictors have been proposed with high prediction accuracies but none of them can provide 100% accuracy. We show that multithreaded architecture is a better candidate for utilizing speculative execution than scalar architectures. Generally the branch prediction performance degradation is compounded for larger window sizes on scalar architectures, while for a multithreaded architecture, by increasing the number of executing threads, we could sustain a higher performance for a large aggregated speculative window size. Hence, heavier workloads may increase performance and utilization for multithreaded architectures. We present analytical and simulation results to support our argument.","PeriodicalId":281991,"journal":{"name":"Proceedings IEEE Southeastcon '98 'Engineering for a New Era'","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122335720","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 : 1998-04-24DOI: 10.1109/SECON.1998.673280
Israel E Chen-Jimenez, A. Kornecki, Janusz Zalewski
This paper presents a new method to evaluate software safety using rough set theory. The data about the software product and process are collected via a questionnaire. The result is the direct assessment of the software safety in terms of a single coefficient, whose goodness is then analyzed using rough sets. An automatic tool for the Windows platform has been developed to help in the interactive analysis. Results from a real experiment of software safety evaluation are discussed.
{"title":"Software safety analysis using rough sets","authors":"Israel E Chen-Jimenez, A. Kornecki, Janusz Zalewski","doi":"10.1109/SECON.1998.673280","DOIUrl":"https://doi.org/10.1109/SECON.1998.673280","url":null,"abstract":"This paper presents a new method to evaluate software safety using rough set theory. The data about the software product and process are collected via a questionnaire. The result is the direct assessment of the software safety in terms of a single coefficient, whose goodness is then analyzed using rough sets. An automatic tool for the Windows platform has been developed to help in the interactive analysis. Results from a real experiment of software safety evaluation are discussed.","PeriodicalId":281991,"journal":{"name":"Proceedings IEEE Southeastcon '98 'Engineering for a New Era'","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132602953","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 : 1998-04-24DOI: 10.1109/SECON.1998.673288
M. Kovač
Volume of data acquired during measurements is usually very large in size. In this paper we present compact, yet efficient, data compression algorithm that can be used to significantly reduce storage and telecommunication costs for the above-mentioned applications. The algorithm is lossless, based on the statistical information and can achieve a compression ratio of up to 14:1 on raw binary data. The algorithm has been successfully implemented to compress data from alternative fuel vehicles and photovoltaic systems.
{"title":"Efficient data compression algorithm for data loggers, measurement equipment and remote data analysis applications","authors":"M. Kovač","doi":"10.1109/SECON.1998.673288","DOIUrl":"https://doi.org/10.1109/SECON.1998.673288","url":null,"abstract":"Volume of data acquired during measurements is usually very large in size. In this paper we present compact, yet efficient, data compression algorithm that can be used to significantly reduce storage and telecommunication costs for the above-mentioned applications. The algorithm is lossless, based on the statistical information and can achieve a compression ratio of up to 14:1 on raw binary data. The algorithm has been successfully implemented to compress data from alternative fuel vehicles and photovoltaic systems.","PeriodicalId":281991,"journal":{"name":"Proceedings IEEE Southeastcon '98 'Engineering for a New Era'","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131022085","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 : 1998-04-24DOI: 10.1109/SECON.1998.673348
E. Wheeler, J. L. Boone
An investigation employing nuclear transmutation to probe the effects of copper doping in ZnSe is presented. Three experimental observations are reported in this investigation. With the first, as-grown ZnSe is irradiated with thermal neutrons which results, after thermal annealing, in the incorporation of Cu/sub Zn/ centers. Results are consistent with isolated Cu/sub Zn/ being involved in the copper-red and copper-green emissions in ZnSe but not in the I/sub 1//sup d/ excitonic emission. Next are annealing experiments of as-grown wafers of ZnSe which are thermally annealed in a zinc-rich atmosphere. After annealing, the wafers show a remarkable reduction in the I/sub 1//sup d/ emission. Finally, we report observations of homoepitaxial layers of ZnSe grown from elemental zinc and selenium. In these experiments, we have seen that the I/sub 1//sup d/ can be greatly reduced, often eliminated, by growing the layers in a zinc-rich atmosphere. All three observations are consistent with the I/sub 1//sup d/ emission being associated with V/sub Zn/ but not with Cu/sub Zn/ centers,.
{"title":"The origin of the I/sub 1//sup d/ excitonic emission in ZnSe","authors":"E. Wheeler, J. L. Boone","doi":"10.1109/SECON.1998.673348","DOIUrl":"https://doi.org/10.1109/SECON.1998.673348","url":null,"abstract":"An investigation employing nuclear transmutation to probe the effects of copper doping in ZnSe is presented. Three experimental observations are reported in this investigation. With the first, as-grown ZnSe is irradiated with thermal neutrons which results, after thermal annealing, in the incorporation of Cu/sub Zn/ centers. Results are consistent with isolated Cu/sub Zn/ being involved in the copper-red and copper-green emissions in ZnSe but not in the I/sub 1//sup d/ excitonic emission. Next are annealing experiments of as-grown wafers of ZnSe which are thermally annealed in a zinc-rich atmosphere. After annealing, the wafers show a remarkable reduction in the I/sub 1//sup d/ emission. Finally, we report observations of homoepitaxial layers of ZnSe grown from elemental zinc and selenium. In these experiments, we have seen that the I/sub 1//sup d/ can be greatly reduced, often eliminated, by growing the layers in a zinc-rich atmosphere. All three observations are consistent with the I/sub 1//sup d/ emission being associated with V/sub Zn/ but not with Cu/sub Zn/ centers,.","PeriodicalId":281991,"journal":{"name":"Proceedings IEEE Southeastcon '98 'Engineering for a New Era'","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134357663","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：