Pub Date : 2004-09-27DOI: 10.1109/SSST.2004.1295659
O. González, H. Herencia-Zapana, W. Gray
In this paper an equivalence between the stochastic stability of a sampled-data system and its associated discrete-time representation is established. The sampled-data system consists of a deterministic, linear, time-invariant, continuous-time plant and a stochastic, linear, time-invariant, discrete-time, jump linear controller. The jump linear controller models computer systems and communication networks that are subject to stochastic upsets or disruptions. This sampled-data model has been used in the analysis and design of fault-tolerant systems and computer-control systems with random communication delays without taking into account the inter-sample response. This paper shows that the known equivalence between the stability of a deterministic sampled-data system and the associated discrete-time representation holds even in a stochastic framework.
{"title":"Stochastic stability of sampled data systems with a jump linear controller","authors":"O. González, H. Herencia-Zapana, W. Gray","doi":"10.1109/SSST.2004.1295659","DOIUrl":"https://doi.org/10.1109/SSST.2004.1295659","url":null,"abstract":"In this paper an equivalence between the stochastic stability of a sampled-data system and its associated discrete-time representation is established. The sampled-data system consists of a deterministic, linear, time-invariant, continuous-time plant and a stochastic, linear, time-invariant, discrete-time, jump linear controller. The jump linear controller models computer systems and communication networks that are subject to stochastic upsets or disruptions. This sampled-data model has been used in the analysis and design of fault-tolerant systems and computer-control systems with random communication delays without taking into account the inter-sample response. This paper shows that the known equivalence between the stability of a deterministic sampled-data system and the associated discrete-time representation holds even in a stochastic framework.","PeriodicalId":309617,"journal":{"name":"Thirty-Sixth Southeastern Symposium on System Theory, 2004. Proceedings of the","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122940048","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 : 2004-09-27DOI: 10.1109/SSST.2004.1295712
S. Foo, M. Arradondo
In the age of the Internet, computer intrusion detections are at best a black art. The science to perceive, track, and understand intrusions is still at its infancy. Many different technologies and topologies are under investigation to see which model provides adequate data for intrusion detection. In this paper, we present a platform independent Java-based mobile agent intrusion detection system (IDS). In our prototype mobile agent IDS, the focus is on port scanning and file integrity checking. The mobile agents are implemented using the Concordia mobile agent development kit. The performance and memory resources required to run these mobile agents are discussed.
{"title":"Mobile agents for computer intrusion detection","authors":"S. Foo, M. Arradondo","doi":"10.1109/SSST.2004.1295712","DOIUrl":"https://doi.org/10.1109/SSST.2004.1295712","url":null,"abstract":"In the age of the Internet, computer intrusion detections are at best a black art. The science to perceive, track, and understand intrusions is still at its infancy. Many different technologies and topologies are under investigation to see which model provides adequate data for intrusion detection. In this paper, we present a platform independent Java-based mobile agent intrusion detection system (IDS). In our prototype mobile agent IDS, the focus is on port scanning and file integrity checking. The mobile agents are implemented using the Concordia mobile agent development kit. The performance and memory resources required to run these mobile agents are discussed.","PeriodicalId":309617,"journal":{"name":"Thirty-Sixth Southeastern Symposium on System Theory, 2004. Proceedings of the","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125352592","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 : 2004-09-27DOI: 10.1109/SSST.2004.1295608
Guy M. Nicoletti
Direct volume rendering is an advanced technique for visualizing the structure of volume data sets. It maps directly from the data set to the rendered image without any intermediate geometric calculations. This paper presents a method to generate high-quality renderings by designing opacity functions that (1) are correctly correlated to particular data values of interest, (2) discriminate regions of interest from remaining data values, and (3) dynamically control the transfer function by relating values located in the raw volume data set to color and specified opacity values. Gradient constructs are formulated to capture more effectively subtle features within the volume. Gradient calculations are performed on directional derivatives along gradient directions. The method described herein is applied to data generated at the GE Aircraft Engines in Evansdale, OH which are available through the Stanford's Volpack library.
{"title":"Volume visualization: advances in transfer and opacity function generation for interactive direct volume rendering","authors":"Guy M. Nicoletti","doi":"10.1109/SSST.2004.1295608","DOIUrl":"https://doi.org/10.1109/SSST.2004.1295608","url":null,"abstract":"Direct volume rendering is an advanced technique for visualizing the structure of volume data sets. It maps directly from the data set to the rendered image without any intermediate geometric calculations. This paper presents a method to generate high-quality renderings by designing opacity functions that (1) are correctly correlated to particular data values of interest, (2) discriminate regions of interest from remaining data values, and (3) dynamically control the transfer function by relating values located in the raw volume data set to color and specified opacity values. Gradient constructs are formulated to capture more effectively subtle features within the volume. Gradient calculations are performed on directional derivatives along gradient directions. The method described herein is applied to data generated at the GE Aircraft Engines in Evansdale, OH which are available through the Stanford's Volpack library.","PeriodicalId":309617,"journal":{"name":"Thirty-Sixth Southeastern Symposium on System Theory, 2004. Proceedings of the","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125152746","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 : 2004-09-27DOI: 10.1109/SSST.2004.1295685
S. Femmam
A delay-dependent approach analysis to robust filtering is proposed for linear discrete-time systems with multiple delays in the state. The uncertain parameters are supposed to reside in a polytope and the attention is focused on the analysis and design of robust filters guaranteeing a prescribed noise attenuation level. The proposed filter analysis methodology includes some recently appeared results.
{"title":"A delay-dependent approach analysis to robust filtering","authors":"S. Femmam","doi":"10.1109/SSST.2004.1295685","DOIUrl":"https://doi.org/10.1109/SSST.2004.1295685","url":null,"abstract":"A delay-dependent approach analysis to robust filtering is proposed for linear discrete-time systems with multiple delays in the state. The uncertain parameters are supposed to reside in a polytope and the attention is focused on the analysis and design of robust filters guaranteeing a prescribed noise attenuation level. The proposed filter analysis methodology includes some recently appeared results.","PeriodicalId":309617,"journal":{"name":"Thirty-Sixth Southeastern Symposium on System Theory, 2004. Proceedings of the","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116974551","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 : 2004-09-27DOI: 10.1109/SSST.2004.1295703
J. L. Baumann, C.D. Johnson
The problem of globally stabilizing an inverted-pendulum with arbitrary initial conditions and with the pivot mounted on a movable platform constrained to move in horizontal motion and controlled by a servomotor is considered. A novel solution involving a dual-mode optimal control-law consisting of a bang-bang, time-optimal mode and a smooth linear mode is developed. The results are verified in a full, non-linear simulation as well as implemented in an actual hardware model. These results appear in a Master's Thesis written in 1971 and apparently predate similar results reported in the literature.
{"title":"Global-stabilization of the inverted-pendulum; an early solution and hardware implementation","authors":"J. L. Baumann, C.D. Johnson","doi":"10.1109/SSST.2004.1295703","DOIUrl":"https://doi.org/10.1109/SSST.2004.1295703","url":null,"abstract":"The problem of globally stabilizing an inverted-pendulum with arbitrary initial conditions and with the pivot mounted on a movable platform constrained to move in horizontal motion and controlled by a servomotor is considered. A novel solution involving a dual-mode optimal control-law consisting of a bang-bang, time-optimal mode and a smooth linear mode is developed. The results are verified in a full, non-linear simulation as well as implemented in an actual hardware model. These results appear in a Master's Thesis written in 1971 and apparently predate similar results reported in the literature.","PeriodicalId":309617,"journal":{"name":"Thirty-Sixth Southeastern Symposium on System Theory, 2004. Proceedings of the","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122208200","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 : 2004-09-27DOI: 10.1109/SSST.2004.1295663
A. Leedy, R. Nelms
The development of a simplified model of an inverter-fed induction motor that can be used in the analysis of a dc power system containing motor drive loads is presented. The model is based on the steady-state T-type equivalent circuit of the induction motor and the input-output relationships of the six-step voltage source inverter. In the simplified model, a V-I load characteristic curve is established that allows the inverter, motor, and load to be replaced by a current-controlled voltage source. The model is verified using PSPICE and Matlab. The simplified model also has the potential to be utilized in the analysis of a multiple bus dc power system by incorporating the V-I load curves of each motor-drive load into a Newton-Raphson iterative procedure.
{"title":"Simplified model of an inverter-fed induction motor for the analysis of a dc power system","authors":"A. Leedy, R. Nelms","doi":"10.1109/SSST.2004.1295663","DOIUrl":"https://doi.org/10.1109/SSST.2004.1295663","url":null,"abstract":"The development of a simplified model of an inverter-fed induction motor that can be used in the analysis of a dc power system containing motor drive loads is presented. The model is based on the steady-state T-type equivalent circuit of the induction motor and the input-output relationships of the six-step voltage source inverter. In the simplified model, a V-I load characteristic curve is established that allows the inverter, motor, and load to be replaced by a current-controlled voltage source. The model is verified using PSPICE and Matlab. The simplified model also has the potential to be utilized in the analysis of a multiple bus dc power system by incorporating the V-I load curves of each motor-drive load into a Newton-Raphson iterative procedure.","PeriodicalId":309617,"journal":{"name":"Thirty-Sixth Southeastern Symposium on System Theory, 2004. Proceedings of the","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121450961","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 : 2004-09-27DOI: 10.1109/SSST.2004.1295715
O. Fadiran, L. Kaplan
This work investigates the use of a clutter complexity measure for the selection of bands for a detector operating over forward looking hyper-spectral image cubes. By clutter complexity, we mean an aggregation of statistical image features that predict the "degree of difficulty" to detect and/or identify a target object in an image. We show that clutter complexity correlates well with single-band automatic target recognition (ATR) performance. We also show the performance of the multi-band ATR when the bands are selected based on clutter complexity. To baseline this ATR performance, we consider a uniform band ordering strategy and an "optimal" ordering strategy determined by an exhaustive search. Our results show that the ordering by clutter complexity results in an improvement of the ATR performance when compared to the uniform ordering strategy. This improved performance is however not as good as the performance obtained for the optimal ordering.
{"title":"Clutter complexity analysis of hyper-spectral bands","authors":"O. Fadiran, L. Kaplan","doi":"10.1109/SSST.2004.1295715","DOIUrl":"https://doi.org/10.1109/SSST.2004.1295715","url":null,"abstract":"This work investigates the use of a clutter complexity measure for the selection of bands for a detector operating over forward looking hyper-spectral image cubes. By clutter complexity, we mean an aggregation of statistical image features that predict the \"degree of difficulty\" to detect and/or identify a target object in an image. We show that clutter complexity correlates well with single-band automatic target recognition (ATR) performance. We also show the performance of the multi-band ATR when the bands are selected based on clutter complexity. To baseline this ATR performance, we consider a uniform band ordering strategy and an \"optimal\" ordering strategy determined by an exhaustive search. Our results show that the ordering by clutter complexity results in an improvement of the ATR performance when compared to the uniform ordering strategy. This improved performance is however not as good as the performance obtained for the optimal ordering.","PeriodicalId":309617,"journal":{"name":"Thirty-Sixth Southeastern Symposium on System Theory, 2004. Proceedings of the","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113943882","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 : 2004-09-27DOI: 10.1109/SSST.2004.1295625
Q. Han, C. Ham, R. Phillips
This paper presents a nonlinear robust speed control for dealing with variations of the permanent-magnet synchronous motor (PMSM) stator resistance due to temperature changes. The change in resistance has a large impact on the slotless surface PMSM control performance due to its relatively large stator resistance in comparison with its inductance impedance. Nonlinear robust control eliminates the need for temperature sensing and is a suitable control approach for the frequently starting and stopping operation motor control. The controller takes into account the system nonlinearities and makes no requirements on the variation of the resistance. Therefore, it is full range operational. The Lyapunov stability proof is given in detail. The designed controller is shown to be efficient and robust with the simulation.
{"title":"PMSM nonlinear robust control for temperature compensation","authors":"Q. Han, C. Ham, R. Phillips","doi":"10.1109/SSST.2004.1295625","DOIUrl":"https://doi.org/10.1109/SSST.2004.1295625","url":null,"abstract":"This paper presents a nonlinear robust speed control for dealing with variations of the permanent-magnet synchronous motor (PMSM) stator resistance due to temperature changes. The change in resistance has a large impact on the slotless surface PMSM control performance due to its relatively large stator resistance in comparison with its inductance impedance. Nonlinear robust control eliminates the need for temperature sensing and is a suitable control approach for the frequently starting and stopping operation motor control. The controller takes into account the system nonlinearities and makes no requirements on the variation of the resistance. Therefore, it is full range operational. The Lyapunov stability proof is given in detail. The designed controller is shown to be efficient and robust with the simulation.","PeriodicalId":309617,"journal":{"name":"Thirty-Sixth Southeastern Symposium on System Theory, 2004. Proceedings of the","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129910946","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 : 2004-09-27DOI: 10.1109/SSST.2004.1295669
S. Kuppuswamy, M. Abdelrahman
Successful operation of a cupola furnace is highly dependent upon the mitigation of operational problems occurring in them. Cupolas rely on the experience of the operator for a smooth operation. The focus of this research is to develop a fuzzy-logic based expert system, which would provide expert advice to a cupola operator to address multiple operational problems occurring simultaneously in the cupola. An expert system for a cupola operation is not currently available. Expert sub-systems, which address individual operational problems, are developed and tested. These sub-systems are integrated using an intelligent methodology so as to provide suggestions that address multiple operational problems simultaneously. A self-corrective capability was introduced into the expert system by developing an iterative process for some vital parameters in the cupola furnace. Provisions were given to the user to prioritize the inputs and seek the pertinent suggestions from expert system. The expert system was tested on a set of operational problems. It performed satisfactorily. As expected some problems could not be addressed simultaneously as they require contradictory solutions. The user was given the ability to modify the requirements so that a solution satisfying part of the requirements can be achieved.
{"title":"A fuzzy-logic based expert system for cupola furnaces","authors":"S. Kuppuswamy, M. Abdelrahman","doi":"10.1109/SSST.2004.1295669","DOIUrl":"https://doi.org/10.1109/SSST.2004.1295669","url":null,"abstract":"Successful operation of a cupola furnace is highly dependent upon the mitigation of operational problems occurring in them. Cupolas rely on the experience of the operator for a smooth operation. The focus of this research is to develop a fuzzy-logic based expert system, which would provide expert advice to a cupola operator to address multiple operational problems occurring simultaneously in the cupola. An expert system for a cupola operation is not currently available. Expert sub-systems, which address individual operational problems, are developed and tested. These sub-systems are integrated using an intelligent methodology so as to provide suggestions that address multiple operational problems simultaneously. A self-corrective capability was introduced into the expert system by developing an iterative process for some vital parameters in the cupola furnace. Provisions were given to the user to prioritize the inputs and seek the pertinent suggestions from expert system. The expert system was tested on a set of operational problems. It performed satisfactorily. As expected some problems could not be addressed simultaneously as they require contradictory solutions. The user was given the ability to modify the requirements so that a solution satisfying part of the requirements can be achieved.","PeriodicalId":309617,"journal":{"name":"Thirty-Sixth Southeastern Symposium on System Theory, 2004. Proceedings of the","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132137943","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 : 2004-09-27DOI: 10.1109/SSST.2004.1295638
M.M. Noel, T. Jannett
In this paper a new hybrid particle swarm optimization (PSO) algorithm is introduced which makes use of gradient information to achieve faster convergence without getting trapped in local minima. Simulation results comparing the standard PSO algorithm to the new hybrid PSO algorithm are presented. The De Jong test suite of optimization problems is used to test the performance of all algorithms. Performance measures to compare the performance of different algorithms are discussed. The new hybrid PSO algorithm is shown to converge faster for a certain class of optimization problems.
{"title":"Simulation of a new hybrid particle swarm optimization algorithm","authors":"M.M. Noel, T. Jannett","doi":"10.1109/SSST.2004.1295638","DOIUrl":"https://doi.org/10.1109/SSST.2004.1295638","url":null,"abstract":"In this paper a new hybrid particle swarm optimization (PSO) algorithm is introduced which makes use of gradient information to achieve faster convergence without getting trapped in local minima. Simulation results comparing the standard PSO algorithm to the new hybrid PSO algorithm are presented. The De Jong test suite of optimization problems is used to test the performance of all algorithms. Performance measures to compare the performance of different algorithms are discussed. The new hybrid PSO algorithm is shown to converge faster for a certain class of optimization problems.","PeriodicalId":309617,"journal":{"name":"Thirty-Sixth Southeastern Symposium on System Theory, 2004. Proceedings of the","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132924630","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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