Pub Date : 1996-04-11DOI: 10.1109/SECON.1996.510049
S. Garrett, S. Yadav
High frequency chattering about the sliding line in variable structure control systems is undesirable in practice. In this paper, a method is proposed to eliminate this chattering. The system is allowed to switch once on crossing the switching line, after which the trajectory follows a path that closes in on the slower eigenvector. The loss of speed is compensated for by tailoring the eigenvector (achieved by feedback design) such that the eigenvalues are sufficiently negative. Theoretical analysis is confirmed by simulations.
{"title":"Chattering alleviation in variable structure control systems","authors":"S. Garrett, S. Yadav","doi":"10.1109/SECON.1996.510049","DOIUrl":"https://doi.org/10.1109/SECON.1996.510049","url":null,"abstract":"High frequency chattering about the sliding line in variable structure control systems is undesirable in practice. In this paper, a method is proposed to eliminate this chattering. The system is allowed to switch once on crossing the switching line, after which the trajectory follows a path that closes in on the slower eigenvector. The loss of speed is compensated for by tailoring the eigenvector (achieved by feedback design) such that the eigenvalues are sufficiently negative. Theoretical analysis is confirmed by simulations.","PeriodicalId":338029,"journal":{"name":"Proceedings of SOUTHEASTCON '96","volume":"94 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115156517","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 : 1996-04-11DOI: 10.1109/SECON.1996.510069
L. Hopwood, W. Miller, A. George
In image processing applications, the storage capacity required for images can exceed feasible storage capabilities. A technique to alleviate this problem by removal of unnecessary background information through image processing is discussed. Specifically, a parallel implementation of a first-order, derivative-based edge detection algorithm and the Hough transform applied to rectangular objects is given. A variation of the classical Hough transform to detect lines is employed to locate rectangular objects of known size in an image. A parallel virtual machine is used to exploit the inherent parallelism found in these algorithms over a cluster of 7 workstations. Through the use of these techniques, the rectangular object is detected and stored as a separate image, and storage capacity can be reduced by approximately 30%, not including standard data compression. Parallelizing the algorithms provides a significant speedup advantage over the normal sequential operation of the programs.
{"title":"Parallel implementation of the Hough transform for the extraction of rectangular objects","authors":"L. Hopwood, W. Miller, A. George","doi":"10.1109/SECON.1996.510069","DOIUrl":"https://doi.org/10.1109/SECON.1996.510069","url":null,"abstract":"In image processing applications, the storage capacity required for images can exceed feasible storage capabilities. A technique to alleviate this problem by removal of unnecessary background information through image processing is discussed. Specifically, a parallel implementation of a first-order, derivative-based edge detection algorithm and the Hough transform applied to rectangular objects is given. A variation of the classical Hough transform to detect lines is employed to locate rectangular objects of known size in an image. A parallel virtual machine is used to exploit the inherent parallelism found in these algorithms over a cluster of 7 workstations. Through the use of these techniques, the rectangular object is detected and stored as a separate image, and storage capacity can be reduced by approximately 30%, not including standard data compression. Parallelizing the algorithms provides a significant speedup advantage over the normal sequential operation of the programs.","PeriodicalId":338029,"journal":{"name":"Proceedings of SOUTHEASTCON '96","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117013805","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 : 1996-04-11DOI: 10.1109/SECON.1996.510081
Bennamoun, B. Boashash, M. Dunbar
The need to successfully navigate in an underwater environment is rapidly becoming an important concern in the 1990s. This paper presents the development of an integrated navigation system for use by autonomous vehicles (AUV) using GPS, INS and sonar. This paper discusses the existing problems with sub-sea navigation, the motivation for an integrated system, the mathematical derivation for an integrated GPS/INS/sonar system, and the results obtained from extensive testing.
{"title":"The development of an integrated GPS/INS/sonar navigation system","authors":"Bennamoun, B. Boashash, M. Dunbar","doi":"10.1109/SECON.1996.510081","DOIUrl":"https://doi.org/10.1109/SECON.1996.510081","url":null,"abstract":"The need to successfully navigate in an underwater environment is rapidly becoming an important concern in the 1990s. This paper presents the development of an integrated navigation system for use by autonomous vehicles (AUV) using GPS, INS and sonar. This paper discusses the existing problems with sub-sea navigation, the motivation for an integrated system, the mathematical derivation for an integrated GPS/INS/sonar system, and the results obtained from extensive testing.","PeriodicalId":338029,"journal":{"name":"Proceedings of SOUTHEASTCON '96","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124525048","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 : 1996-04-11DOI: 10.1109/SECON.1996.510166
W.L. Elden
Nearly all engineering and scientific codes of ethics proclaim that the overriding ethical obligation of a professional is to protect the public's safety, welfare and environment. The degree to which an engineer/scientist is capable of exercising this obligation will determine how close the individual really has attained standing in society as a true "professional". The author believes that this goal has not been achieved and that an insidious practice of "ethical harassment" has existed for a long time. Members of the IEEE may request assistance from its Member Conduct Committee or file misconduct complaints against other members when faced with this practice.
{"title":"Curtailment of ethical harassment of engineers","authors":"W.L. Elden","doi":"10.1109/SECON.1996.510166","DOIUrl":"https://doi.org/10.1109/SECON.1996.510166","url":null,"abstract":"Nearly all engineering and scientific codes of ethics proclaim that the overriding ethical obligation of a professional is to protect the public's safety, welfare and environment. The degree to which an engineer/scientist is capable of exercising this obligation will determine how close the individual really has attained standing in society as a true \"professional\". The author believes that this goal has not been achieved and that an insidious practice of \"ethical harassment\" has existed for a long time. Members of the IEEE may request assistance from its Member Conduct Committee or file misconduct complaints against other members when faced with this practice.","PeriodicalId":338029,"journal":{"name":"Proceedings of SOUTHEASTCON '96","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124861899","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 : 1996-04-11DOI: 10.1109/SECON.1996.510024
K. Anbumani, V. Malarvizhi
Design of a real-time patient management system that monitors both ECG and blood pressure is discussed. A detailed procedure is given for the object-oriented design of the system.
讨论了一种同时监测心电图和血压的实时病人管理系统的设计。给出了系统面向对象设计的详细步骤。
{"title":"Object-oriented real-time system design of patient management system","authors":"K. Anbumani, V. Malarvizhi","doi":"10.1109/SECON.1996.510024","DOIUrl":"https://doi.org/10.1109/SECON.1996.510024","url":null,"abstract":"Design of a real-time patient management system that monitors both ECG and blood pressure is discussed. A detailed procedure is given for the object-oriented design of the system.","PeriodicalId":338029,"journal":{"name":"Proceedings of SOUTHEASTCON '96","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121530767","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 : 1996-04-11DOI: 10.1109/SECON.1996.510031
C.W. McKerley
Two degree of freedom seekers are used in many aerospace applications. When designing the control loops for such seekers a planar representation is usually adequate. However when the seeker is modeled in conjunction with an overall system concept, the coupled two degree of freedom equations must be used. In addition seekers are not perfectly balanced and they generally have a center of gravity (CG) offset relative to the gimbal rotation axes. The effects of this imbalance must be modeled to determine just how much CG offset can be allowed. The derivation of the equations of motion for a two degree of freedom coupled seeker with no crossproducts of inertia or mass imbalance has been presented by Cannon (1967). This paper extends this approach to the case of inertia coupling and mass imbalance. A block diagram is also presented representing the math flow diagrams from which the seeker math model may be developed.
{"title":"A model for a two degree of freedom coupled seeker with mass imbalance","authors":"C.W. McKerley","doi":"10.1109/SECON.1996.510031","DOIUrl":"https://doi.org/10.1109/SECON.1996.510031","url":null,"abstract":"Two degree of freedom seekers are used in many aerospace applications. When designing the control loops for such seekers a planar representation is usually adequate. However when the seeker is modeled in conjunction with an overall system concept, the coupled two degree of freedom equations must be used. In addition seekers are not perfectly balanced and they generally have a center of gravity (CG) offset relative to the gimbal rotation axes. The effects of this imbalance must be modeled to determine just how much CG offset can be allowed. The derivation of the equations of motion for a two degree of freedom coupled seeker with no crossproducts of inertia or mass imbalance has been presented by Cannon (1967). This paper extends this approach to the case of inertia coupling and mass imbalance. A block diagram is also presented representing the math flow diagrams from which the seeker math model may be developed.","PeriodicalId":338029,"journal":{"name":"Proceedings of SOUTHEASTCON '96","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128561772","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 : 1996-04-11DOI: 10.1109/SECON.1996.510043
R. Hestand, C. Christodoulou
The popularity and usefulness of microstrip antennas has made it increasingly necessary to find a method to accurately determine the radiation patterns of these antennas through the modeling process. One such tool studied was MSC/EMAS and MSC/XL, which are programs that utilize the finite element method. In this paper, these programs are used to construct and analyze several microstrip antennas such as a patch antenna, a square spiral antenna and an equiangular spiral antenna (the spiral antennas have become popular due their very large bandwidth and circular polarization). The far-field patterns were obtained and verified with a suitable reference, such as experimental data and/or theoretical data. The current density distributions on the radiating conductors were also examined to provide insight into the radiation of these antennas.
{"title":"Analysis of planar microstrip antennas using the finite element method","authors":"R. Hestand, C. Christodoulou","doi":"10.1109/SECON.1996.510043","DOIUrl":"https://doi.org/10.1109/SECON.1996.510043","url":null,"abstract":"The popularity and usefulness of microstrip antennas has made it increasingly necessary to find a method to accurately determine the radiation patterns of these antennas through the modeling process. One such tool studied was MSC/EMAS and MSC/XL, which are programs that utilize the finite element method. In this paper, these programs are used to construct and analyze several microstrip antennas such as a patch antenna, a square spiral antenna and an equiangular spiral antenna (the spiral antennas have become popular due their very large bandwidth and circular polarization). The far-field patterns were obtained and verified with a suitable reference, such as experimental data and/or theoretical data. The current density distributions on the radiating conductors were also examined to provide insight into the radiation of these antennas.","PeriodicalId":338029,"journal":{"name":"Proceedings of SOUTHEASTCON '96","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130687685","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 : 1996-04-11DOI: 10.1109/SECON.1996.510119
Xiang Li, P. Flikkema
The propagation channel of wireless indoor networks can be modeled as a linear filter with a complex-valued impulse response. Due to the effect of indoor multipath fading, this linear filter is characterized by three sets of random variables-path arrival times, path amplitudes and carrier phase shifts. This paper discusses a simulation model for the distribution of path arrival times based on the modified Poisson or /spl Delta/-K model. We present a discrete-time non-homogeneous Markov description of the arrival process, and present results indicating potential improvements in estimation of the model parameters. We then describe an implementation of the model using the Ptolemy simulation environment which can be used for evaluation of wideband wireless indoor communication links.
{"title":"Simulation of multipath arrival times for wireless indoor networks","authors":"Xiang Li, P. Flikkema","doi":"10.1109/SECON.1996.510119","DOIUrl":"https://doi.org/10.1109/SECON.1996.510119","url":null,"abstract":"The propagation channel of wireless indoor networks can be modeled as a linear filter with a complex-valued impulse response. Due to the effect of indoor multipath fading, this linear filter is characterized by three sets of random variables-path arrival times, path amplitudes and carrier phase shifts. This paper discusses a simulation model for the distribution of path arrival times based on the modified Poisson or /spl Delta/-K model. We present a discrete-time non-homogeneous Markov description of the arrival process, and present results indicating potential improvements in estimation of the model parameters. We then describe an implementation of the model using the Ptolemy simulation environment which can be used for evaluation of wideband wireless indoor communication links.","PeriodicalId":338029,"journal":{"name":"Proceedings of SOUTHEASTCON '96","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124222174","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 : 1996-04-11DOI: 10.1109/SECON.1996.510095
F. D. King, P. Winson, A. Snider, L. Dunleavy, D. Levinson
Conditions numbers expressing the sensitivity of computed circuit element values to inaccuracies in S-parameter measurements are derived and evaluated for a standard small-signal MESFET model. The condition numbers shed light on the common difficulty experienced by transistor modelers in extracting accurate values for the input resistance. Other elements are also classified according to their sensitivity.
{"title":"The condition numbers arising in MESFET parameter extraction","authors":"F. D. King, P. Winson, A. Snider, L. Dunleavy, D. Levinson","doi":"10.1109/SECON.1996.510095","DOIUrl":"https://doi.org/10.1109/SECON.1996.510095","url":null,"abstract":"Conditions numbers expressing the sensitivity of computed circuit element values to inaccuracies in S-parameter measurements are derived and evaluated for a standard small-signal MESFET model. The condition numbers shed light on the common difficulty experienced by transistor modelers in extracting accurate values for the input resistance. Other elements are also classified according to their sensitivity.","PeriodicalId":338029,"journal":{"name":"Proceedings of SOUTHEASTCON '96","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128290921","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 : 1996-04-11DOI: 10.1109/SECON.1996.510149
M. Malek, P. Chillakanti, S. A. Shaikh, A. Sinha
Extracting instruction level parallelism is a key issue in superscalar architecture. We propose a graph theoretic model to identify parallelism in a sequence of instructions. The system graph model (SGM), presented, is a fundamental source of information regarding the resource dependencies, intra-instruction and inter-instruction parallelism, and the cost-performance of the architecture. Additionally, we propose a new technique called hierarchical identification of parallelism (HIP), which is a systematic approach to identify parallelism. Using this technique, an optimizing compiler can obtain a better static schedule of the assembly level instructions. For better understanding of the techniques developed, we have presented a case study of Hewlett-Packard's PA-RISC microprocessor. Finally, we discuss potential application of the proposed graph model in architectural level testing.
{"title":"Graph modeling of parallelism in superscalar architecture-a case study of HP PA-RISC microprocessor","authors":"M. Malek, P. Chillakanti, S. A. Shaikh, A. Sinha","doi":"10.1109/SECON.1996.510149","DOIUrl":"https://doi.org/10.1109/SECON.1996.510149","url":null,"abstract":"Extracting instruction level parallelism is a key issue in superscalar architecture. We propose a graph theoretic model to identify parallelism in a sequence of instructions. The system graph model (SGM), presented, is a fundamental source of information regarding the resource dependencies, intra-instruction and inter-instruction parallelism, and the cost-performance of the architecture. Additionally, we propose a new technique called hierarchical identification of parallelism (HIP), which is a systematic approach to identify parallelism. Using this technique, an optimizing compiler can obtain a better static schedule of the assembly level instructions. For better understanding of the techniques developed, we have presented a case study of Hewlett-Packard's PA-RISC microprocessor. Finally, we discuss potential application of the proposed graph model in architectural level testing.","PeriodicalId":338029,"journal":{"name":"Proceedings of SOUTHEASTCON '96","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126557264","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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