Pub Date : 1991-12-01DOI: 10.1109/ICSYSE.1991.161174
Xia, De Abreu-Garcia, Hartley
Two models for the two different control schemes for a parallel flow heat exchanger are developed. By spatially lumping a heat exchanger model, a good approximate model which has a high system order is produced. Model reduction techniques are applied to these to obtain low-order models that are suitable for dynamic analysis and control design. The simulation method is discussed.<>
{"title":"Modelling and simulation of a heat exchanger","authors":"Xia, De Abreu-Garcia, Hartley","doi":"10.1109/ICSYSE.1991.161174","DOIUrl":"https://doi.org/10.1109/ICSYSE.1991.161174","url":null,"abstract":"Two models for the two different control schemes for a parallel flow heat exchanger are developed. By spatially lumping a heat exchanger model, a good approximate model which has a high system order is produced. Model reduction techniques are applied to these to obtain low-order models that are suitable for dynamic analysis and control design. The simulation method is discussed.<<ETX>>","PeriodicalId":250037,"journal":{"name":"IEEE 1991 International Conference on Systems Engineering","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117314336","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 : 1991-12-01DOI: 10.1109/ICSYSE.1991.161172
J. Tester, D. Robinson
The application of concurrent engineering approach to the design of a large flexible space structure is discussed. A full system model using bond graphs incorporating orbital and ballistic dynamics, controls, optics, and vibrational analyses is developed. Design of experiment techniques is used to analyze the entire system and determine the optimum set of design parameters. The objective of the design effort involved the simultaneous design of the control algorithm, structural characteristics, and optical geometry. The system size and mass were limited by current space shuttle capabilities. The satellite was required to track the missile plume of an ICBM with minimum line-of-site error, and transmit the position data to earth.<>
{"title":"Multidisciplinary modeling and design of a space system","authors":"J. Tester, D. Robinson","doi":"10.1109/ICSYSE.1991.161172","DOIUrl":"https://doi.org/10.1109/ICSYSE.1991.161172","url":null,"abstract":"The application of concurrent engineering approach to the design of a large flexible space structure is discussed. A full system model using bond graphs incorporating orbital and ballistic dynamics, controls, optics, and vibrational analyses is developed. Design of experiment techniques is used to analyze the entire system and determine the optimum set of design parameters. The objective of the design effort involved the simultaneous design of the control algorithm, structural characteristics, and optical geometry. The system size and mass were limited by current space shuttle capabilities. The satellite was required to track the missile plume of an ICBM with minimum line-of-site error, and transmit the position data to earth.<<ETX>>","PeriodicalId":250037,"journal":{"name":"IEEE 1991 International Conference on Systems Engineering","volume":"138 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122926605","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 : 1991-12-01DOI: 10.1109/ICSYSE.1991.161168
J. Turi, H. Ozbay
A mathematical model, suitable for robust controller design, is derived for an aero-elastic system. The particular aero-elastic system studied is Theodorsen's problem, i.e., a thin airfoil with trailing-edge flap placed into a perfect two-dimensional unsteady flow, where stabilizing active control is a torque applied at the flap-hinge line. It is shown that the theoretical framework developed by the authors for the robust stabilization of a class of systems governed by singular integro-differential equations provides a proper setting for the control of this aero-elastic system.<>
{"title":"Robust stabilization of an aero-elastic system","authors":"J. Turi, H. Ozbay","doi":"10.1109/ICSYSE.1991.161168","DOIUrl":"https://doi.org/10.1109/ICSYSE.1991.161168","url":null,"abstract":"A mathematical model, suitable for robust controller design, is derived for an aero-elastic system. The particular aero-elastic system studied is Theodorsen's problem, i.e., a thin airfoil with trailing-edge flap placed into a perfect two-dimensional unsteady flow, where stabilizing active control is a torque applied at the flap-hinge line. It is shown that the theoretical framework developed by the authors for the robust stabilization of a class of systems governed by singular integro-differential equations provides a proper setting for the control of this aero-elastic system.<<ETX>>","PeriodicalId":250037,"journal":{"name":"IEEE 1991 International Conference on Systems Engineering","volume":"261 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123038952","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 : 1991-12-01DOI: 10.1109/ICSYSE.1991.161153
A. McAulay, J. Oh
Adaptive-image learning and discrimination techniques using classifier systems are presented. The genetic algorithm (GA) is used for a learning strategy in the system. The proposed system learns arbitrary image objects without any prior knowledge of given images and recognizes them. The system also makes up for some general weak points that are present in most learning systems including conventional classifier systems. That is, first, in a learning system, forgetting of knowledge usually occurs if the knowledge is not used for a long time period. The system still maximizes adaptability, but it prevents the system from forgetting useful rules by using the 'no-unlearn' mode. Second, to improve large-class image classification and learning, a multiple sublength concept has been introduced to genetic algorithms. Third, a triggered GA, which plays an important role in distinguishing two or more similar images by eliminating generalists, is developed.<>
{"title":"Inductive character learning and classification with genetic algorithms","authors":"A. McAulay, J. Oh","doi":"10.1109/ICSYSE.1991.161153","DOIUrl":"https://doi.org/10.1109/ICSYSE.1991.161153","url":null,"abstract":"Adaptive-image learning and discrimination techniques using classifier systems are presented. The genetic algorithm (GA) is used for a learning strategy in the system. The proposed system learns arbitrary image objects without any prior knowledge of given images and recognizes them. The system also makes up for some general weak points that are present in most learning systems including conventional classifier systems. That is, first, in a learning system, forgetting of knowledge usually occurs if the knowledge is not used for a long time period. The system still maximizes adaptability, but it prevents the system from forgetting useful rules by using the 'no-unlearn' mode. Second, to improve large-class image classification and learning, a multiple sublength concept has been introduced to genetic algorithms. Third, a triggered GA, which plays an important role in distinguishing two or more similar images by eliminating generalists, is developed.<<ETX>>","PeriodicalId":250037,"journal":{"name":"IEEE 1991 International Conference on Systems Engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131389666","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 : 1991-08-01DOI: 10.1109/ICSYSE.1991.161141
M. Vajta
A model reduction (or lumping) technique for a class of parabolic-type partial differential equations is given, and its application is discussed. The frequency response of the temperature distribution in any multilayer solid is developed and given by a matrix expression. The distributed transfer functions (DTFs) between the surface variables and the ambient variables are given. The proposed method is based on the special high-frequency properties of these DTFs. The rational fraction expansion is compared with the lumping technique. Numerical examples from real-time applications are given.<>
{"title":"New model reduction technique for a class of parabolic partial differential equations (temperature distribution)","authors":"M. Vajta","doi":"10.1109/ICSYSE.1991.161141","DOIUrl":"https://doi.org/10.1109/ICSYSE.1991.161141","url":null,"abstract":"A model reduction (or lumping) technique for a class of parabolic-type partial differential equations is given, and its application is discussed. The frequency response of the temperature distribution in any multilayer solid is developed and given by a matrix expression. The distributed transfer functions (DTFs) between the surface variables and the ambient variables are given. The proposed method is based on the special high-frequency properties of these DTFs. The rational fraction expansion is compared with the lumping technique. Numerical examples from real-time applications are given.<<ETX>>","PeriodicalId":250037,"journal":{"name":"IEEE 1991 International Conference on Systems Engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130514609","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 : 1991-08-01DOI: 10.1109/ICSYSE.1991.161099
T. Wheatley
Simple models for bus arbitration policies and data transfer techniques in multiprocessor systems are developed, and a procedure for examining their effects on the latency and robustness of the underlying communication subsystem is outlined. The onlink and offlink times of the data transfers are shown to be key factors in the determination of the expected latency and the number of processors that can be supported on the link. The use of unfairness arbitration policies is shown to be inadequate for all but the simplest of systems.<>
{"title":"Determining bus arbitration policies and data transfer techniques for multiprocessor systems","authors":"T. Wheatley","doi":"10.1109/ICSYSE.1991.161099","DOIUrl":"https://doi.org/10.1109/ICSYSE.1991.161099","url":null,"abstract":"Simple models for bus arbitration policies and data transfer techniques in multiprocessor systems are developed, and a procedure for examining their effects on the latency and robustness of the underlying communication subsystem is outlined. The onlink and offlink times of the data transfers are shown to be key factors in the determination of the expected latency and the number of processors that can be supported on the link. The use of unfairness arbitration policies is shown to be inadequate for all but the simplest of systems.<<ETX>>","PeriodicalId":250037,"journal":{"name":"IEEE 1991 International Conference on Systems Engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126566596","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 : 1991-07-08DOI: 10.1109/IJCNN.1991.155464
C. Chen, X. Xu, A. McAuley
Map learning using associative memory is presented. Given a source location and a destination location to be visited and its associated visiting path, an associative memory neural network which can remember and recall all possible paired-location combinations is constructed. Kth nearest neighbor transformation is used to transfer the input paired locations to a vector form indicating the neighboring information among all the locations in the map. Training patterns are selected from the linear combination of the eigenvector of the covariance matrix of the associative group and the input vectors. Training the network with the selected transformed training vectors, the best path of any two points in the map can be obtained. An example of learning a city map is given.<>
{"title":"Map learning using associative memory neural network","authors":"C. Chen, X. Xu, A. McAuley","doi":"10.1109/IJCNN.1991.155464","DOIUrl":"https://doi.org/10.1109/IJCNN.1991.155464","url":null,"abstract":"Map learning using associative memory is presented. Given a source location and a destination location to be visited and its associated visiting path, an associative memory neural network which can remember and recall all possible paired-location combinations is constructed. Kth nearest neighbor transformation is used to transfer the input paired locations to a vector form indicating the neighboring information among all the locations in the map. Training patterns are selected from the linear combination of the eigenvector of the covariance matrix of the associative group and the input vectors. Training the network with the selected transformed training vectors, the best path of any two points in the map can be obtained. An example of learning a city map is given.<<ETX>>","PeriodicalId":250037,"journal":{"name":"IEEE 1991 International Conference on Systems Engineering","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125540166","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.1991.161158
E. Mahmoud, S. Mashali, Y. Elcherif, E. Talkhan
The realization of 2-D FIR filters using lower-upper triangular (LU) decomposition, where the 1-D filters resulting from the decomposition are realized by 1-D lattices, is discussed. Analysis is performed and comparisons are made between the proposed realization and four different structures in terms of hardware cost, cycle time, finite register length effects, and regularity. It is shown that the error performance of the proposed realizations is superior to comparable realizations. It offers the best compromise among the various figures of merit.<>
{"title":"Lattice realization of decomposed 2-D filters","authors":"E. Mahmoud, S. Mashali, Y. Elcherif, E. Talkhan","doi":"10.1109/ICSYSE.1991.161158","DOIUrl":"https://doi.org/10.1109/ICSYSE.1991.161158","url":null,"abstract":"The realization of 2-D FIR filters using lower-upper triangular (LU) decomposition, where the 1-D filters resulting from the decomposition are realized by 1-D lattices, is discussed. Analysis is performed and comparisons are made between the proposed realization and four different structures in terms of hardware cost, cycle time, finite register length effects, and regularity. It is shown that the error performance of the proposed realizations is superior to comparable realizations. It offers the best compromise among the various figures of merit.<<ETX>>","PeriodicalId":250037,"journal":{"name":"IEEE 1991 International Conference on Systems Engineering","volume":"15 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":"115606182","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.1991.161108
L. Xu
The author considers analogical learning as a continuous process in which analogy is used to conjecture new knowledge about domain, and discusses the possible application of analogical learning in expert systems. A framework of analogical learning is presented which addresses the concept of analogical learning and describes the procedures that can be used to apply the concept to expert systems. An example is taken from an implemented expert system in AIDS intervention and prevention.<>
{"title":"Analogical learning and expert systems","authors":"L. Xu","doi":"10.1109/ICSYSE.1991.161108","DOIUrl":"https://doi.org/10.1109/ICSYSE.1991.161108","url":null,"abstract":"The author considers analogical learning as a continuous process in which analogy is used to conjecture new knowledge about domain, and discusses the possible application of analogical learning in expert systems. A framework of analogical learning is presented which addresses the concept of analogical learning and describes the procedures that can be used to apply the concept to expert systems. An example is taken from an implemented expert system in AIDS intervention and prevention.<<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":"130395537","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.1991.161130
I. Defée, Y. Neuvo
The possibility of using nonlinear edge- and detail-preserving median-type filters for image pyramid generation is investigated. Nonlinear interpolation filters should make better use of image structure and the differences between original and interpolated images can be expected to have low entropy as the image information will be removed from them to a high extent. However, there are many other factors which have impact on the entropy of the difference images and the theoretical expectations must be checked experimentally. Several types of detail-preserving median-type filters for interpolation are described. These filters are used in various combinations for the generation of image pyramids. Entropy of differential images is measured and compared to linear filters. The results show that the nonlinear filters perform well on various types of images and give results which are close to the best linear filters.<>
{"title":"Nonlinear filters in image pyramid generation","authors":"I. Defée, Y. Neuvo","doi":"10.1109/ICSYSE.1991.161130","DOIUrl":"https://doi.org/10.1109/ICSYSE.1991.161130","url":null,"abstract":"The possibility of using nonlinear edge- and detail-preserving median-type filters for image pyramid generation is investigated. Nonlinear interpolation filters should make better use of image structure and the differences between original and interpolated images can be expected to have low entropy as the image information will be removed from them to a high extent. However, there are many other factors which have impact on the entropy of the difference images and the theoretical expectations must be checked experimentally. Several types of detail-preserving median-type filters for interpolation are described. These filters are used in various combinations for the generation of image pyramids. Entropy of differential images is measured and compared to linear filters. The results show that the nonlinear filters perform well on various types of images and give results which are close to the best linear filters.<<ETX>>","PeriodicalId":250037,"journal":{"name":"IEEE 1991 International Conference on Systems Engineering","volume":"19 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":"129301171","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：