Pub Date : 1998-04-24DOI: 10.1109/SECON.1998.673365
P. Phothimat, M. Awipi
Transistor characteristics are modified by the application of high magnetic fields. These changes are due to Hall effect voltages or magnetoresistance. Translations of device characteristics can be modeled by connecting voltage or current sources in series/parallel with the device. These translations are similar to the effect of ionizing radiation creating a plasma column in the device. This results in deterioration of device performance due to lowered noise margins in digital circuits. Because of the similarities of these effects, the magnetic field can, with some advantages, replace ionizing radiation in simulating single event upset (SEU) testing.
{"title":"Effect of high magnetic field on transistor characteristics with applications to SEU testing","authors":"P. Phothimat, M. Awipi","doi":"10.1109/SECON.1998.673365","DOIUrl":"https://doi.org/10.1109/SECON.1998.673365","url":null,"abstract":"Transistor characteristics are modified by the application of high magnetic fields. These changes are due to Hall effect voltages or magnetoresistance. Translations of device characteristics can be modeled by connecting voltage or current sources in series/parallel with the device. These translations are similar to the effect of ionizing radiation creating a plasma column in the device. This results in deterioration of device performance due to lowered noise margins in digital circuits. Because of the similarities of these effects, the magnetic field can, with some advantages, replace ionizing radiation in simulating single event upset (SEU) testing.","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":"129987269","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.1998.673276
G. Semmel, D. G. Linton
Statistical software testing presents two difficulties for the tester: (1) establishing accurate user profiles (i.e. usage probabilities), and (2) incurring lengthy test times. An algorithm, named the frequency count method (FCM), is developed which addresses both difficulties simultaneously. FCM finds usage probabilities within predetermined ranges and concurrently minimizes the amount of testing time. First, FCM randomly generates a large number of matrices for a given Markov chain with constrained usage probabilities. For each one-step transition matrix associated with the given Markov chain usage model, FCM simulates the steps of the chain. FCM flags the usage matrix which requires the minimum expected amount of testing time (assuming no failures) and ensures theoretical and calculated stationary probability values are within some preset precision. Thus, by generating test sequences from the usage probabilities of the flagged matrix, the expected minimum statistical testing time is achieved. This minimum time is optimal with respect to the transition probability ranges and the given execution times. Employing a 5-state usage model with numerical values for the transition probability bounds and code execution times, the FCM algorithm is illustrated and the expected minimum testing time is calculated.
{"title":"Determining optimal testing times for Markov chain usage models [software testing]","authors":"G. Semmel, D. G. Linton","doi":"10.1109/SECON.1998.673276","DOIUrl":"https://doi.org/10.1109/SECON.1998.673276","url":null,"abstract":"Statistical software testing presents two difficulties for the tester: (1) establishing accurate user profiles (i.e. usage probabilities), and (2) incurring lengthy test times. An algorithm, named the frequency count method (FCM), is developed which addresses both difficulties simultaneously. FCM finds usage probabilities within predetermined ranges and concurrently minimizes the amount of testing time. First, FCM randomly generates a large number of matrices for a given Markov chain with constrained usage probabilities. For each one-step transition matrix associated with the given Markov chain usage model, FCM simulates the steps of the chain. FCM flags the usage matrix which requires the minimum expected amount of testing time (assuming no failures) and ensures theoretical and calculated stationary probability values are within some preset precision. Thus, by generating test sequences from the usage probabilities of the flagged matrix, the expected minimum statistical testing time is achieved. This minimum time is optimal with respect to the transition probability ranges and the given execution times. Employing a 5-state usage model with numerical values for the transition probability bounds and code execution times, the FCM algorithm is illustrated and the expected minimum testing time is calculated.","PeriodicalId":281991,"journal":{"name":"Proceedings IEEE Southeastcon '98 'Engineering for a New Era'","volume":"45 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":"124979529","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.1998.673292
I. Shahin, N. Botros
We present an algorithm for an isolated-word text-dependent speaker identification under normal and four stressful styles. The styles which are designed to simulate speech produced under real stressful conditions are: shout, slow, loud, and soft. The algorithm is based on the hidden Markov model (HMM) with a cepstral stress compensation technique. Comparing the HMM without cepstral stress compensation with the HMM combined with cepstral stress compensation, the recognition rate has improved with a little increase in the computations. The recognition rate has improved: from 90% to 93% in normal style, from 19% to 73% in shout style, from 62% to 84% in slow style, from 38% to 75% in loud style, and from 30% to 81% in soft style. The cepstral coefficients and transitional coefficients are combined to form an observation vector of the hidden Markov model. This algorithm is tested on a limited number of speakers due to our limited data base.
{"title":"Text-dependent speaker identification using hidden Markov model with stress compensation technique","authors":"I. Shahin, N. Botros","doi":"10.1109/SECON.1998.673292","DOIUrl":"https://doi.org/10.1109/SECON.1998.673292","url":null,"abstract":"We present an algorithm for an isolated-word text-dependent speaker identification under normal and four stressful styles. The styles which are designed to simulate speech produced under real stressful conditions are: shout, slow, loud, and soft. The algorithm is based on the hidden Markov model (HMM) with a cepstral stress compensation technique. Comparing the HMM without cepstral stress compensation with the HMM combined with cepstral stress compensation, the recognition rate has improved with a little increase in the computations. The recognition rate has improved: from 90% to 93% in normal style, from 19% to 73% in shout style, from 62% to 84% in slow style, from 38% to 75% in loud style, and from 30% to 81% in soft style. The cepstral coefficients and transitional coefficients are combined to form an observation vector of the hidden Markov model. This algorithm is tested on a limited number of speakers due to our limited data base.","PeriodicalId":281991,"journal":{"name":"Proceedings IEEE Southeastcon '98 'Engineering for a New Era'","volume":"85 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":"123331705","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.1998.673369
J. Meza, A. Samra
Three-phase bridge rectifiers are widely used in industry to interface DC loads to the electric utility because of their low ripple content output and high power-handling capability. The nonlinear nature of the diode type switching devices causes significant line-current harmonics resulting in increased distortion, malfunction of sensitive electronic equipment, increased losses, and contributes to inefficient use of electric energy. This paper describes a new approach to reduce those line-current harmonics generated by a three-phase diode rectifier type utility interface. The proposed approach consists of a novel interconnection of a delta-zig zag transformer between the AC and DC sides of the diode rectifier topology. This transformer connection in combination with the conduction intervals of each diode generates automatically a circulating third harmonic current between the AC and DC side of the rectifier bridge. Voltage and current analysis and simulation using the Electro-Magnetic Transients Program (EMTP) showed that the generated circulating current may drastically reduce the line current harmonics of the AC side and smooth out the DC output voltage of the rectifier.
{"title":"A new technique to reduce line-current harmonics generated by a three-phase bridge rectifier","authors":"J. Meza, A. Samra","doi":"10.1109/SECON.1998.673369","DOIUrl":"https://doi.org/10.1109/SECON.1998.673369","url":null,"abstract":"Three-phase bridge rectifiers are widely used in industry to interface DC loads to the electric utility because of their low ripple content output and high power-handling capability. The nonlinear nature of the diode type switching devices causes significant line-current harmonics resulting in increased distortion, malfunction of sensitive electronic equipment, increased losses, and contributes to inefficient use of electric energy. This paper describes a new approach to reduce those line-current harmonics generated by a three-phase diode rectifier type utility interface. The proposed approach consists of a novel interconnection of a delta-zig zag transformer between the AC and DC sides of the diode rectifier topology. This transformer connection in combination with the conduction intervals of each diode generates automatically a circulating third harmonic current between the AC and DC side of the rectifier bridge. Voltage and current analysis and simulation using the Electro-Magnetic Transients Program (EMTP) showed that the generated circulating current may drastically reduce the line current harmonics of the AC side and smooth out the DC output voltage of the rectifier.","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":"128602239","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.1998.673309
M. A. Fares, S. C. Fares, C.A. Ventrice
Based on the laser Doppler anemometry technique and Mie scattering theory, the visibility using a circularly polarized backscattered laser beam was derived and computed. A computer model was developed to establish a relationship between the visibility and the particle size. Experimental data are obtained for comparison with the theoretical results for latex particles of known sizes (0.46 /spl mu/m, 0.74 /spl mu/m, 0.9 /spl mu/m, 1.04 /spl mu/m, 2.02 /spl mu/m, and 2.91 /spl mu/m). Various visibility values associated with various signals are obtained for each particle. Preliminary results establish that these experimental data follow the same trend as the theoretical results (visibility versus diameter).
{"title":"Theoretical data and experimental measurements comparison of the visibility of latex particles using LDA technique in the backscatter direction","authors":"M. A. Fares, S. C. Fares, C.A. Ventrice","doi":"10.1109/SECON.1998.673309","DOIUrl":"https://doi.org/10.1109/SECON.1998.673309","url":null,"abstract":"Based on the laser Doppler anemometry technique and Mie scattering theory, the visibility using a circularly polarized backscattered laser beam was derived and computed. A computer model was developed to establish a relationship between the visibility and the particle size. Experimental data are obtained for comparison with the theoretical results for latex particles of known sizes (0.46 /spl mu/m, 0.74 /spl mu/m, 0.9 /spl mu/m, 1.04 /spl mu/m, 2.02 /spl mu/m, and 2.91 /spl mu/m). Various visibility values associated with various signals are obtained for each particle. Preliminary results establish that these experimental data follow the same trend as the theoretical results (visibility versus diameter).","PeriodicalId":281991,"journal":{"name":"Proceedings IEEE Southeastcon '98 'Engineering for a New Era'","volume":"10 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":"127146436","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.1998.673364
J. Zec, W. Linwood Jones
In this paper a simple method for relative antenna calibration is applied to NSCAT (NASA Scatterometer), and the model used is described. Calibration data sets are extracted using high-resolution masks. Results are presented for the Amazon rain forest (traditionally used) and the Siberian plain. Beam correction tables are derived for balancing normalized radar backscatter coefficient measurements from different antennas.
{"title":"Relative calibration of scatterometer antennas using land targets","authors":"J. Zec, W. Linwood Jones","doi":"10.1109/SECON.1998.673364","DOIUrl":"https://doi.org/10.1109/SECON.1998.673364","url":null,"abstract":"In this paper a simple method for relative antenna calibration is applied to NSCAT (NASA Scatterometer), and the model used is described. Calibration data sets are extracted using high-resolution masks. Results are presented for the Amazon rain forest (traditionally used) and the Siberian plain. Beam correction tables are derived for balancing normalized radar backscatter coefficient measurements from different antennas.","PeriodicalId":281991,"journal":{"name":"Proceedings IEEE Southeastcon '98 'Engineering for a New Era'","volume":"117 31","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120820604","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.1998.673316
O.M. Ba Rukab, M. M. Shahsavari
An itinerant agent is an agent (object) which can roam the Internet in a secure way and which does useful work for the user. The framework allows the agent and the agent's location to mutually authenticate each other. The developed agent infrastructure provides a way to a survivable intelligent agent that can relieve the agent's owner from worrying about illegal access to distributed databases. This infrastructure provides a general-purpose framework that is usable on the Internet. This agent framework incorporates security measures on both the agent and the agent's location. Java and CORBA languages are used, since Java provides the object with mobility and CORBA provides interoperability for the service afforded by each agent location for agents written in different languages.
{"title":"Survivable itinerant object","authors":"O.M. Ba Rukab, M. M. Shahsavari","doi":"10.1109/SECON.1998.673316","DOIUrl":"https://doi.org/10.1109/SECON.1998.673316","url":null,"abstract":"An itinerant agent is an agent (object) which can roam the Internet in a secure way and which does useful work for the user. The framework allows the agent and the agent's location to mutually authenticate each other. The developed agent infrastructure provides a way to a survivable intelligent agent that can relieve the agent's owner from worrying about illegal access to distributed databases. This infrastructure provides a general-purpose framework that is usable on the Internet. This agent framework incorporates security measures on both the agent and the agent's location. Java and CORBA languages are used, since Java provides the object with mobility and CORBA provides interoperability for the service afforded by each agent location for agents written in different languages.","PeriodicalId":281991,"journal":{"name":"Proceedings IEEE Southeastcon '98 'Engineering for a New Era'","volume":"19 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":"123666641","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.1998.673355
Mark R. Nusekabel
The performance of a local area network (LAN) can be improved in many cases by the installation of LAN switches. Determining how to partition a LAN and estimating the performance improvements from a given partitioning are difficult problems. An objective function is developed to quantify a partitioning of a LAN based on a tree-structured topology as supported by IEEE 802.1d compliant LAN switches. It is shown that the objective function developed and the use of tabu search metaheuristic results in a method that finds better partitionings and does so faster than existing methods.
{"title":"Using tabu search to find optimal switched LAN configurations","authors":"Mark R. Nusekabel","doi":"10.1109/SECON.1998.673355","DOIUrl":"https://doi.org/10.1109/SECON.1998.673355","url":null,"abstract":"The performance of a local area network (LAN) can be improved in many cases by the installation of LAN switches. Determining how to partition a LAN and estimating the performance improvements from a given partitioning are difficult problems. An objective function is developed to quantify a partitioning of a LAN based on a tree-structured topology as supported by IEEE 802.1d compliant LAN switches. It is shown that the objective function developed and the use of tabu search metaheuristic results in a method that finds better partitionings and does so faster than existing methods.","PeriodicalId":281991,"journal":{"name":"Proceedings IEEE Southeastcon '98 'Engineering for a New Era'","volume":"140 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":"116515016","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.1998.673304
Huai Wei, G. Zhu, I. Bartarseh, J. Vaidya
The conventional voltage source inverter for motor drive encountered severe problems such as high EMI, wide range of harmonics, heavy acoustic noise and low efficiency. Resonant DC-link inverter technique becomes dominate in solving the above problems due to its simplicity in both power stage topology and control strategy. In this paper, operation principle of resonant DC-link inverter is analyzed. A design procedure of this type inverter for high power application (200 HP) is presented. PSPICE simulation on the designed resonant DC-link inverter has been conducted to verify its availability for high power application. The improvements in motor drive by using resonant DC-link inverter is shown by comparing the PSPICE simulation results of conventional hard switching inverter.
{"title":"Analysis, design and simulation of a resonant DC link inverter for high power, high frequency brushless DC motor","authors":"Huai Wei, G. Zhu, I. Bartarseh, J. Vaidya","doi":"10.1109/SECON.1998.673304","DOIUrl":"https://doi.org/10.1109/SECON.1998.673304","url":null,"abstract":"The conventional voltage source inverter for motor drive encountered severe problems such as high EMI, wide range of harmonics, heavy acoustic noise and low efficiency. Resonant DC-link inverter technique becomes dominate in solving the above problems due to its simplicity in both power stage topology and control strategy. In this paper, operation principle of resonant DC-link inverter is analyzed. A design procedure of this type inverter for high power application (200 HP) is presented. PSPICE simulation on the designed resonant DC-link inverter has been conducted to verify its availability for high power application. The improvements in motor drive by using resonant DC-link inverter is shown by comparing the PSPICE simulation results of conventional hard switching inverter.","PeriodicalId":281991,"journal":{"name":"Proceedings IEEE Southeastcon '98 'Engineering for a New Era'","volume":"68 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":"127553795","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.1998.673353
S. Wunnava, M. Woon Choy
With recent innovations in Internet, Intranet, and World Wide Web, and user friendly capabilities of dynamic HTML, video streaming schemes, and virtual reality based 3D modeling, it is now completely possible to conduct electronic commerce on the Internet. 3D dynamic images of consumer products can be housed on remote file servers and can be observed by the clients elsewhere. The remote clients can also interactively communicate with the host server to observe and monitor the functional behavior of the product under consideration, leading to the concept of electronic commerce. The author discusses the network based electronic commerce concepts, common gateway interface and video streaming methodologies suitable for electronic commerce.
{"title":"Network based intelligent electronic commerce","authors":"S. Wunnava, M. Woon Choy","doi":"10.1109/SECON.1998.673353","DOIUrl":"https://doi.org/10.1109/SECON.1998.673353","url":null,"abstract":"With recent innovations in Internet, Intranet, and World Wide Web, and user friendly capabilities of dynamic HTML, video streaming schemes, and virtual reality based 3D modeling, it is now completely possible to conduct electronic commerce on the Internet. 3D dynamic images of consumer products can be housed on remote file servers and can be observed by the clients elsewhere. The remote clients can also interactively communicate with the host server to observe and monitor the functional behavior of the product under consideration, leading to the concept of electronic commerce. The author discusses the network based electronic commerce concepts, common gateway interface and video streaming methodologies suitable for electronic commerce.","PeriodicalId":281991,"journal":{"name":"Proceedings IEEE Southeastcon '98 'Engineering for a New Era'","volume":"27 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":"126348298","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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