Pub Date : 1900-01-01DOI: 10.1109/ICSYSE.1991.161068
J. McCorkle
The synthetic aperture radar (SAR) focusing problem is considered, with special attention given to focusing an area in the near-field of the synthetic aperture over a decade or more of bandwidth in a manner that preserves target resonance characteristics. An approximation that reduces the computational load is shown. An error analysis of the approximation shows quantitatively what conditions are required to guarantee that the depth of focus is adequate to preserve long-duration target resonance effects.<>
{"title":"Focusing of synthetic aperture ultra wideband data","authors":"J. McCorkle","doi":"10.1109/ICSYSE.1991.161068","DOIUrl":"https://doi.org/10.1109/ICSYSE.1991.161068","url":null,"abstract":"The synthetic aperture radar (SAR) focusing problem is considered, with special attention given to focusing an area in the near-field of the synthetic aperture over a decade or more of bandwidth in a manner that preserves target resonance characteristics. An approximation that reduces the computational load is shown. An error analysis of the approximation shows quantitatively what conditions are required to guarantee that the depth of focus is adequate to preserve long-duration target resonance effects.<<ETX>>","PeriodicalId":250037,"journal":{"name":"IEEE 1991 International Conference on Systems Engineering","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117085295","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 : 1900-01-01DOI: 10.1109/ICSYSE.1991.161170
G. Batta, A. Chen
A modular rotational vibration system designed to facilitate the study of active control of vibrating systems is discussed. The model error associated with four common types of identification problems has been studied. The general multiplicative uncertainty shape for a vibration system is small in low frequencies, large at high frequencies. The frequency-domain error function has sharp peaks near the frequency of each mode. The inability to identify a high-frequency mode causes an increase of uncertainties at all frequencies. Missing a low-frequency mode causes the uncertainties to be much larger at all frequencies than missing a high-frequency mode. Hysteresis causes a small increase of uncertainty at low frequencies, but its overall effect is relatively small.<>
{"title":"An experimental system for the study of active vibration control-development and modeling","authors":"G. Batta, A. Chen","doi":"10.1109/ICSYSE.1991.161170","DOIUrl":"https://doi.org/10.1109/ICSYSE.1991.161170","url":null,"abstract":"A modular rotational vibration system designed to facilitate the study of active control of vibrating systems is discussed. The model error associated with four common types of identification problems has been studied. The general multiplicative uncertainty shape for a vibration system is small in low frequencies, large at high frequencies. The frequency-domain error function has sharp peaks near the frequency of each mode. The inability to identify a high-frequency mode causes an increase of uncertainties at all frequencies. Missing a low-frequency mode causes the uncertainties to be much larger at all frequencies than missing a high-frequency mode. Hysteresis causes a small increase of uncertainty at low frequencies, but its overall effect is relatively small.<<ETX>>","PeriodicalId":250037,"journal":{"name":"IEEE 1991 International Conference on Systems Engineering","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124569823","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 : 1900-01-01DOI: 10.1109/ICSYSE.1991.161127
R. Acharya
A symmetrical axis transform (SAT) using geodesic morphology for 3-D object representation is proposed. The SAT has been previously defined using Euclidean morphological operations. An extension of the SAT to represent arbitrary non-Euclidean surfaces using geodesic operators is described. The concept of a surface skeleton is defined. Initial experimental results are also provided.<>
{"title":"Surface representation using geodesic morphology","authors":"R. Acharya","doi":"10.1109/ICSYSE.1991.161127","DOIUrl":"https://doi.org/10.1109/ICSYSE.1991.161127","url":null,"abstract":"A symmetrical axis transform (SAT) using geodesic morphology for 3-D object representation is proposed. The SAT has been previously defined using Euclidean morphological operations. An extension of the SAT to represent arbitrary non-Euclidean surfaces using geodesic operators is described. The concept of a surface skeleton is defined. Initial experimental results are also provided.<<ETX>>","PeriodicalId":250037,"journal":{"name":"IEEE 1991 International Conference on Systems Engineering","volume":"267 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121352304","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 : 1900-01-01DOI: 10.1109/ICSYSE.1991.161117
E. Teixeira, G. Jayaraman, G. Shue, P. Crago, K. Loparo, H. Chizeck
The authors consider the control of a class of nonlinear systems using feedback linearization methods, in which the control maps are learned using an artificial neural net. The class of systems investigated involves the multiplication of separate subsystems. The motivation for considering the real-time control of such systems is the fact that they represent the input-output properties of electrically stimulated muscle. Such systems must be controlled as part of neural prostheses that are designed to restore function to individuals who are paralyzed.<>
{"title":"Feedback control of nonlinear multiplicative systems using neural networks: an application to electrically stimulated muscle","authors":"E. Teixeira, G. Jayaraman, G. Shue, P. Crago, K. Loparo, H. Chizeck","doi":"10.1109/ICSYSE.1991.161117","DOIUrl":"https://doi.org/10.1109/ICSYSE.1991.161117","url":null,"abstract":"The authors consider the control of a class of nonlinear systems using feedback linearization methods, in which the control maps are learned using an artificial neural net. The class of systems investigated involves the multiplication of separate subsystems. The motivation for considering the real-time control of such systems is the fact that they represent the input-output properties of electrically stimulated muscle. Such systems must be controlled as part of neural prostheses that are designed to restore function to individuals who are paralyzed.<<ETX>>","PeriodicalId":250037,"journal":{"name":"IEEE 1991 International Conference on Systems Engineering","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134323203","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 : 1900-01-01DOI: 10.1109/ICSYSE.1991.161101
Q. Liu, J. Astola, Y. Neuvo
An improved adaptive Kronecker Ll filtering algorithm for estimating the optimal Kronecker lL filters under the mean square error criterion is derived. Besides suppressing impulsive noise, the adaptive Kronecker Ll filters preserve signal details, such as edges, more effectively than the traditional ones. Simulation results on image processing are provided to demonstrate the performance of the Kronecker Ll filters.<>
{"title":"An improved Kronecker Ll filtering algorithm","authors":"Q. Liu, J. Astola, Y. Neuvo","doi":"10.1109/ICSYSE.1991.161101","DOIUrl":"https://doi.org/10.1109/ICSYSE.1991.161101","url":null,"abstract":"An improved adaptive Kronecker Ll filtering algorithm for estimating the optimal Kronecker lL filters under the mean square error criterion is derived. Besides suppressing impulsive noise, the adaptive Kronecker Ll filters preserve signal details, such as edges, more effectively than the traditional ones. Simulation results on image processing are provided to demonstrate the performance of the Kronecker Ll filters.<<ETX>>","PeriodicalId":250037,"journal":{"name":"IEEE 1991 International Conference on Systems Engineering","volume":"106 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123693596","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 : 1900-01-01DOI: 10.1109/ICSYSE.1991.161135
J. Peterson, L. Pujara
How to partition an unstable polytope of polynomials into stable and unstable regions is addressed. L.R. Pujara and N. Shanghag have taken the first step by proposing a partition algorithm for unstable polygons of continuous polynomials. The present study begins with a discrete version of the segment lemma of H. Chapellat and S.P. Battacharyya (1989). Some necessary and sufficient conditions are proven for a polynomial vanishing at e* (where *=J omega /sub 0/), for some omega /sub 0/, in a polygon of discrete polynomials. These results lead directly to a method for partitioning polygons of discrete polynomials.<>
{"title":"Some robust stability theorems for polygons of discrete polynomials","authors":"J. Peterson, L. Pujara","doi":"10.1109/ICSYSE.1991.161135","DOIUrl":"https://doi.org/10.1109/ICSYSE.1991.161135","url":null,"abstract":"How to partition an unstable polytope of polynomials into stable and unstable regions is addressed. L.R. Pujara and N. Shanghag have taken the first step by proposing a partition algorithm for unstable polygons of continuous polynomials. The present study begins with a discrete version of the segment lemma of H. Chapellat and S.P. Battacharyya (1989). Some necessary and sufficient conditions are proven for a polynomial vanishing at e* (where *=J omega /sub 0/), for some omega /sub 0/, in a polygon of discrete polynomials. These results lead directly to a method for partitioning polygons of discrete polynomials.<<ETX>>","PeriodicalId":250037,"journal":{"name":"IEEE 1991 International Conference on Systems Engineering","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124344218","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 : 1900-01-01DOI: 10.1109/ICSYSE.1991.161129
Y. Shiu, C. Huang
The problem of finding the 3-D position and orientation of a circular cylinder using one view and known values of its radius and height is considered. Since a cylinder does not have uniquely matchable points or line features, traditional viewpoint recovery mathematics cannot be used. Instead, elliptical projection of the circular ends and straight-line projection of the cylinder sides can be used to calculate the cylinder position up to five degrees of freedom. It is shown that the viewpoint can be independently computed based on either the elliptical projection of the circular top or the straight-line projection of the cylinder sides.<>
{"title":"Pose determination of circular cylinders using elliptical and side projections","authors":"Y. Shiu, C. Huang","doi":"10.1109/ICSYSE.1991.161129","DOIUrl":"https://doi.org/10.1109/ICSYSE.1991.161129","url":null,"abstract":"The problem of finding the 3-D position and orientation of a circular cylinder using one view and known values of its radius and height is considered. Since a cylinder does not have uniquely matchable points or line features, traditional viewpoint recovery mathematics cannot be used. Instead, elliptical projection of the circular ends and straight-line projection of the cylinder sides can be used to calculate the cylinder position up to five degrees of freedom. It is shown that the viewpoint can be independently computed based on either the elliptical projection of the circular top or the straight-line projection of the cylinder sides.<<ETX>>","PeriodicalId":250037,"journal":{"name":"IEEE 1991 International Conference on Systems Engineering","volume":"200 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115476741","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 : 1900-01-01DOI: 10.1109/ICSYSE.1991.161125
V. Ramamoorthy
A computationally simple algorithm to enhance the visual quality of coarsely quantized video sequences is presented. This algorithm uses nonlinear filters to smooth discontinuous edges and granular noise associated with the quantization process. The nonlinear order statistics filtering approach does not attempt to preserve the edges, but to fill in and smooth the edge discontinuities. With a minor modification, these filters also function as controllable low-pass filters. The structure of these filters is suitable for cost-effective VLSI implementation. Simulation experiments show the efficiency of the enhancement algorithm.<>
{"title":"Adaptive nonlinear enhancement of coarsely quantized video sequences","authors":"V. Ramamoorthy","doi":"10.1109/ICSYSE.1991.161125","DOIUrl":"https://doi.org/10.1109/ICSYSE.1991.161125","url":null,"abstract":"A computationally simple algorithm to enhance the visual quality of coarsely quantized video sequences is presented. This algorithm uses nonlinear filters to smooth discontinuous edges and granular noise associated with the quantization process. The nonlinear order statistics filtering approach does not attempt to preserve the edges, but to fill in and smooth the edge discontinuities. With a minor modification, these filters also function as controllable low-pass filters. The structure of these filters is suitable for cost-effective VLSI implementation. Simulation experiments show the efficiency of the enhancement algorithm.<<ETX>>","PeriodicalId":250037,"journal":{"name":"IEEE 1991 International Conference on Systems Engineering","volume":"146 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125862537","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 : 1900-01-01DOI: 10.1109/ICSYSE.1991.161077
F. Merat, G. Radack, K. Roumina, S. Ruegsegger
A methodology for automated inspection planning of machined parts within feature-based CIM in which part geometry and tolerances are represented as features is described. This representation of information as features is extended to inspection process planning where inspection plan fragments are inspection features containing specific information about how toleranced geometry is to be inspected. A rule base of methods and detailed procedures for evaluating tolerances based on industrial practices are used to generate the inspection plan fragments. A single tolerance can often be inspected in several ways, resulting in the generation of many inspection plan fragments. Inspection planing for computer-controlled coordinate measuring machines is emphasized. The inspection plan fragments for each tolerance in the design are combined into an overall time-efficient inspection plan. An algorithm for inspection process planning is described and applied to a sample part.<>
{"title":"Automated inspection planning within the Rapid Design System","authors":"F. Merat, G. Radack, K. Roumina, S. Ruegsegger","doi":"10.1109/ICSYSE.1991.161077","DOIUrl":"https://doi.org/10.1109/ICSYSE.1991.161077","url":null,"abstract":"A methodology for automated inspection planning of machined parts within feature-based CIM in which part geometry and tolerances are represented as features is described. This representation of information as features is extended to inspection process planning where inspection plan fragments are inspection features containing specific information about how toleranced geometry is to be inspected. A rule base of methods and detailed procedures for evaluating tolerances based on industrial practices are used to generate the inspection plan fragments. A single tolerance can often be inspected in several ways, resulting in the generation of many inspection plan fragments. Inspection planing for computer-controlled coordinate measuring machines is emphasized. The inspection plan fragments for each tolerance in the design are combined into an overall time-efficient inspection plan. An algorithm for inspection process planning is described and applied to a sample part.<<ETX>>","PeriodicalId":250037,"journal":{"name":"IEEE 1991 International Conference on Systems Engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129122450","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 : 1900-01-01DOI: 10.1109/ICSYSE.1991.161084
D. Hung, S. Phillips
A controller design method based on convex programming is used for lightly damped systems with feedback delay. The designed controllers are robust with respect to time delays in the feedback action, which is often crucial to the stability of lightly damped systems. Exogenous disturbances and unmodeled dynamics are taken into account. Since the convex program is a global optimal technique, once a controller is found, it is optimal in the sense that it meets the design specifications. On the other hand, if no solution is found, then there exists no linear, time-invariant controller which can satisfy the design specifications. Simulation results show that the designed controller can effectively stabilize the lightly damped system and significantly improve its performance.<>
{"title":"Robust controller design for lightly damped systems with feedback delay","authors":"D. Hung, S. Phillips","doi":"10.1109/ICSYSE.1991.161084","DOIUrl":"https://doi.org/10.1109/ICSYSE.1991.161084","url":null,"abstract":"A controller design method based on convex programming is used for lightly damped systems with feedback delay. The designed controllers are robust with respect to time delays in the feedback action, which is often crucial to the stability of lightly damped systems. Exogenous disturbances and unmodeled dynamics are taken into account. Since the convex program is a global optimal technique, once a controller is found, it is optimal in the sense that it meets the design specifications. On the other hand, if no solution is found, then there exists no linear, time-invariant controller which can satisfy the design specifications. Simulation results show that the designed controller can effectively stabilize the lightly damped system and significantly improve its performance.<<ETX>>","PeriodicalId":250037,"journal":{"name":"IEEE 1991 International Conference on Systems Engineering","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131465704","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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