Pub Date : 1992-04-12DOI: 10.1109/SECON.1992.202382
S. Zein-Sabatto, G. Cook
The characteristic behavior of three robot manipulator control schemes are analyzed. The controller designs were based on three different control theories, i.e. linear multivariable control, variable structure system, and model-reference adaptive control. The strength and weakness of each controller design are first identified. Then, the three controllers are combined to form a bank of controllers. Finally, two restructuring control mechanisms and three restructuring laws are derived and used to coordinate the operational behavior of the controllers and to dynamically select the proper control action for a prespecified sub-task. The performance of the restructuring control schemes and laws is illustrated by presenting simulation results of the PUMA-560 robot arm.<>
{"title":"Dynamic restructuring mechanisms for robot manipulator controls","authors":"S. Zein-Sabatto, G. Cook","doi":"10.1109/SECON.1992.202382","DOIUrl":"https://doi.org/10.1109/SECON.1992.202382","url":null,"abstract":"The characteristic behavior of three robot manipulator control schemes are analyzed. The controller designs were based on three different control theories, i.e. linear multivariable control, variable structure system, and model-reference adaptive control. The strength and weakness of each controller design are first identified. Then, the three controllers are combined to form a bank of controllers. Finally, two restructuring control mechanisms and three restructuring laws are derived and used to coordinate the operational behavior of the controllers and to dynamically select the proper control action for a prespecified sub-task. The performance of the restructuring control schemes and laws is illustrated by presenting simulation results of the PUMA-560 robot arm.<<ETX>>","PeriodicalId":230446,"journal":{"name":"Proceedings IEEE Southeastcon '92","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127511737","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 : 1992-04-12DOI: 10.1109/SECON.1992.202255
F. Mourtada, R. I. Gray
A theoretical study altered the tube and fin dimensions of a commercial hypothermic heat exchanger (HE) used in cardiopulmonary bypass during open-heart surgery to obtain an optimized design (OHE). This OHE was then tested analytically by modeling the patient/HE system with a single-pool body assumption, modified to accommodate for body temperature gradients. Simultaneous solution of the body differential and system HE equations, showed that the OHE could provide the clinically desirable cool-down phase within 20 min, and the warm-up within 30 min for a wide range of patient types and cardiac outputs. precise holding phase temperatures also could be obtained, +or-0.05 degrees C, through optimal control of the HE's water inlet temperature.<>
{"title":"Designing an extracorporeal deep-hypothermic heat exchanger and optimizing its operating conditions","authors":"F. Mourtada, R. I. Gray","doi":"10.1109/SECON.1992.202255","DOIUrl":"https://doi.org/10.1109/SECON.1992.202255","url":null,"abstract":"A theoretical study altered the tube and fin dimensions of a commercial hypothermic heat exchanger (HE) used in cardiopulmonary bypass during open-heart surgery to obtain an optimized design (OHE). This OHE was then tested analytically by modeling the patient/HE system with a single-pool body assumption, modified to accommodate for body temperature gradients. Simultaneous solution of the body differential and system HE equations, showed that the OHE could provide the clinically desirable cool-down phase within 20 min, and the warm-up within 30 min for a wide range of patient types and cardiac outputs. precise holding phase temperatures also could be obtained, +or-0.05 degrees C, through optimal control of the HE's water inlet temperature.<<ETX>>","PeriodicalId":230446,"journal":{"name":"Proceedings IEEE Southeastcon '92","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130725059","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 : 1992-04-12DOI: 10.1109/SECON.1992.202343
Y.A. Alsaka, S. Sayer
A method for generating three-dimensional sonic images is investigated. The method uses the point-in-space-to-ear-canal transfer functions. These transfer functions were measured by placing a reference microphone at a point in space, placing microphones in the ears of a subject and measuring the two transfer functions, one between the left ear and the reference microphone and the other between the right ear and the reference microphone. The transfer functions were then convolved with a mono signal which produced two signals, one for the left ear and one for the right ear. These signals were then presented to a subject over headphones for evaluation of the three-dimensional effect.<>
{"title":"Three dimensional sound simulation using DSP techniques","authors":"Y.A. Alsaka, S. Sayer","doi":"10.1109/SECON.1992.202343","DOIUrl":"https://doi.org/10.1109/SECON.1992.202343","url":null,"abstract":"A method for generating three-dimensional sonic images is investigated. The method uses the point-in-space-to-ear-canal transfer functions. These transfer functions were measured by placing a reference microphone at a point in space, placing microphones in the ears of a subject and measuring the two transfer functions, one between the left ear and the reference microphone and the other between the right ear and the reference microphone. The transfer functions were then convolved with a mono signal which produced two signals, one for the left ear and one for the right ear. These signals were then presented to a subject over headphones for evaluation of the three-dimensional effect.<<ETX>>","PeriodicalId":230446,"journal":{"name":"Proceedings IEEE Southeastcon '92","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130879204","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 : 1992-04-12DOI: 10.1109/SECON.1992.202260
J. Tucker, M. Tapia
A novel Karnaugh map method for solving two-valued Boolean equations by successive elimination is presented. This method requires the construction of significantly fewer maps and is more direct than existing procedures. A feature of the method is that it distinguishes between 'don't care' and 'can't happen' conditions. The key concept that makes this method possible is the recognition of the importance of distinguishing between those don't care conditions where the value of a function is unimportant and those where the variables are constrained not to assume certain values.<>
{"title":"Using Karnaugh maps to solve Boolean equations by successive elimination","authors":"J. Tucker, M. Tapia","doi":"10.1109/SECON.1992.202260","DOIUrl":"https://doi.org/10.1109/SECON.1992.202260","url":null,"abstract":"A novel Karnaugh map method for solving two-valued Boolean equations by successive elimination is presented. This method requires the construction of significantly fewer maps and is more direct than existing procedures. A feature of the method is that it distinguishes between 'don't care' and 'can't happen' conditions. The key concept that makes this method possible is the recognition of the importance of distinguishing between those don't care conditions where the value of a function is unimportant and those where the variables are constrained not to assume certain values.<<ETX>>","PeriodicalId":230446,"journal":{"name":"Proceedings IEEE Southeastcon '92","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131232184","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 : 1992-04-12DOI: 10.1109/SECON.1992.202308
M. Carley
The author examines the suitability of modeling discrete-time linear systems with a finite number of impulse response (FIR) coefficients. The FIR terms can be used to construct a model of plant transfer function. A theoretical basis for this concept is developed in the form of theorems that characterize sets of transfer functions by their FIR coefficients. To illustrate the modeling technique a feedback control system is designed from the FIR model of an example plant transfer function and simulated. The results of this simulation provide an indication of the accuracy of the FIR model.<>
{"title":"An examination of the accuracy of finite impulse response modeling","authors":"M. Carley","doi":"10.1109/SECON.1992.202308","DOIUrl":"https://doi.org/10.1109/SECON.1992.202308","url":null,"abstract":"The author examines the suitability of modeling discrete-time linear systems with a finite number of impulse response (FIR) coefficients. The FIR terms can be used to construct a model of plant transfer function. A theoretical basis for this concept is developed in the form of theorems that characterize sets of transfer functions by their FIR coefficients. To illustrate the modeling technique a feedback control system is designed from the FIR model of an example plant transfer function and simulated. The results of this simulation provide an indication of the accuracy of the FIR model.<<ETX>>","PeriodicalId":230446,"journal":{"name":"Proceedings IEEE Southeastcon '92","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126631962","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 : 1992-04-12DOI: 10.1109/SECON.1992.202339
A.K. Ojha, D. Koch
The authors evaluate the impact of Swerling I and Swerling II target scintillation models in the presence of additive white Gaussian noise on the resolution properties of pseudonoise (PN) sequence coded waveforms. There are two major factors which significantly affect the performance of radar systems. The first well-known factor is noise, ambient or intentional. The second factor is due to the variation in the echo signal with time: this is also called target fluctuation or scintillation. The effect due to each of these factors has been incorporated into the performance evaluation procedure by applying appropriate statistical models to the problem. The results presented bear out the fact that the use of an appropriate model is highly desirable to avoid misleading results.<>
{"title":"Impact of noise and target fluctuation on the performance of binary phase coded radar signals","authors":"A.K. Ojha, D. Koch","doi":"10.1109/SECON.1992.202339","DOIUrl":"https://doi.org/10.1109/SECON.1992.202339","url":null,"abstract":"The authors evaluate the impact of Swerling I and Swerling II target scintillation models in the presence of additive white Gaussian noise on the resolution properties of pseudonoise (PN) sequence coded waveforms. There are two major factors which significantly affect the performance of radar systems. The first well-known factor is noise, ambient or intentional. The second factor is due to the variation in the echo signal with time: this is also called target fluctuation or scintillation. The effect due to each of these factors has been incorporated into the performance evaluation procedure by applying appropriate statistical models to the problem. The results presented bear out the fact that the use of an appropriate model is highly desirable to avoid misleading results.<<ETX>>","PeriodicalId":230446,"journal":{"name":"Proceedings IEEE Southeastcon '92","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126555198","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 : 1992-04-12DOI: 10.1109/SECON.1992.202370
D. Shen, H. Ogura
The authors report a study on an integrated amorphous silicon photoconductive-type image sensor. The photoconductive-type sensor has the advantage of a high photocurrent. All the elements in an integrated sensor circuit, including sensor, storage capacitor, switch transistor, and matrix wiring, can be fabricated within one deposition process. A novel sandwich structure with a low level-phosphorous-doped layer is proposed to enhance the photoconductivity. A high photoconductivity of 5*10/sup -5/ S cm/sup -1/ has been achieved, with a photosensitivity of 5*10/sup 4/. The key to the sensor is the SiN/a-Si:H interface, which can be controlled by a metal gate underneath the SiN layer. The thin-film transistor with low-level doping in the channel material has an on current of 1 mu A and an on/of ratio of 10/sup 4/.<>
{"title":"Integrated amorphous silicon photoconductive type image sensor","authors":"D. Shen, H. Ogura","doi":"10.1109/SECON.1992.202370","DOIUrl":"https://doi.org/10.1109/SECON.1992.202370","url":null,"abstract":"The authors report a study on an integrated amorphous silicon photoconductive-type image sensor. The photoconductive-type sensor has the advantage of a high photocurrent. All the elements in an integrated sensor circuit, including sensor, storage capacitor, switch transistor, and matrix wiring, can be fabricated within one deposition process. A novel sandwich structure with a low level-phosphorous-doped layer is proposed to enhance the photoconductivity. A high photoconductivity of 5*10/sup -5/ S cm/sup -1/ has been achieved, with a photosensitivity of 5*10/sup 4/. The key to the sensor is the SiN/a-Si:H interface, which can be controlled by a metal gate underneath the SiN layer. The thin-film transistor with low-level doping in the channel material has an on current of 1 mu A and an on/of ratio of 10/sup 4/.<<ETX>>","PeriodicalId":230446,"journal":{"name":"Proceedings IEEE Southeastcon '92","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116547244","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 : 1992-04-12DOI: 10.1109/SECON.1992.202284
D. B. Koch
The technique for nonparametric power spectral density (PSD) estimation introduced by A.H. Nuttall and G.C. Carter (1980, 1982) is essentially a combined time-domain/lag domain weighting method which offers the promise of reduced computations over traditional time-domain weighting methods. A lack of widely published test data, however, has perhaps reduced the widespread application of this technique. In addition, certain anomalies exist when using the technique with real data. These and other issues are discussed along with test cases to illustrate the various phenomena involved. Used correctly, the Nuttall-Carter technique does indeed offer reduced computational loading in certain situations. Used incorrectly, it can mask important spectral features extracted with traditional estimation methods.<>
{"title":"On the use of the Nuttall-Carter technique for PSD estimation","authors":"D. B. Koch","doi":"10.1109/SECON.1992.202284","DOIUrl":"https://doi.org/10.1109/SECON.1992.202284","url":null,"abstract":"The technique for nonparametric power spectral density (PSD) estimation introduced by A.H. Nuttall and G.C. Carter (1980, 1982) is essentially a combined time-domain/lag domain weighting method which offers the promise of reduced computations over traditional time-domain weighting methods. A lack of widely published test data, however, has perhaps reduced the widespread application of this technique. In addition, certain anomalies exist when using the technique with real data. These and other issues are discussed along with test cases to illustrate the various phenomena involved. Used correctly, the Nuttall-Carter technique does indeed offer reduced computational loading in certain situations. Used incorrectly, it can mask important spectral features extracted with traditional estimation methods.<<ETX>>","PeriodicalId":230446,"journal":{"name":"Proceedings IEEE Southeastcon '92","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125212920","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 : 1992-04-12DOI: 10.1109/SECON.1992.202411
A. Elsherbeni, G. Tian, M. Hamid
The problem of scattering of a Gaussian beam from an array of parallel circular cylinders is discussed. The cylinders are made of homogeneous isotropic dielectric materials, or perfectly conducting materials, or a combination of both. An iterative scattering technique is developed to evaluate the near- and far-field components. The iterative technique starts with exact series representation of the initial scattered fields from each cylinder due to the incident Gaussian beam. Then, the sum of the initial scattered fields from all cylinders is considered to be an incident wave on each individual cylinder. An additional scattered field contribution is then obtained and successive scattering can take place until the boundary conditions on the surface of every cylinder are satisfied. Transverse electric and transverse magnetic polarized waves are considered, and the effects of the incident beam parameters on the far scattered field pattern are investigated.<>
{"title":"Scattering of a Gaussian beam by an array of circular conducting and dielectric cylinders","authors":"A. Elsherbeni, G. Tian, M. Hamid","doi":"10.1109/SECON.1992.202411","DOIUrl":"https://doi.org/10.1109/SECON.1992.202411","url":null,"abstract":"The problem of scattering of a Gaussian beam from an array of parallel circular cylinders is discussed. The cylinders are made of homogeneous isotropic dielectric materials, or perfectly conducting materials, or a combination of both. An iterative scattering technique is developed to evaluate the near- and far-field components. The iterative technique starts with exact series representation of the initial scattered fields from each cylinder due to the incident Gaussian beam. Then, the sum of the initial scattered fields from all cylinders is considered to be an incident wave on each individual cylinder. An additional scattered field contribution is then obtained and successive scattering can take place until the boundary conditions on the surface of every cylinder are satisfied. Transverse electric and transverse magnetic polarized waves are considered, and the effects of the incident beam parameters on the far scattered field pattern are investigated.<<ETX>>","PeriodicalId":230446,"journal":{"name":"Proceedings IEEE Southeastcon '92","volume":"95 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122533407","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 : 1992-04-12DOI: 10.1109/SECON.1992.202303
C. Sankar, Charles Snyder, W. Ledbetter
Achieving balance between the need for positive group work and superior independent work is harder if the managers and technologists do not have access to the information on the critical issues facing similar personnel in other technology-intensive organizations. The authors surveyed material in the engineering management area to identify these critical issues. They summarize and clarify these issues using three major categories: perceptions of managers and technologists, training programs, and reward systems. Findings from the survey are described.<>
{"title":"Critical issues in managing technical personnel","authors":"C. Sankar, Charles Snyder, W. Ledbetter","doi":"10.1109/SECON.1992.202303","DOIUrl":"https://doi.org/10.1109/SECON.1992.202303","url":null,"abstract":"Achieving balance between the need for positive group work and superior independent work is harder if the managers and technologists do not have access to the information on the critical issues facing similar personnel in other technology-intensive organizations. The authors surveyed material in the engineering management area to identify these critical issues. They summarize and clarify these issues using three major categories: perceptions of managers and technologists, training programs, and reward systems. Findings from the survey are described.<<ETX>>","PeriodicalId":230446,"journal":{"name":"Proceedings IEEE Southeastcon '92","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131422515","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：