Pub Date : 1998-04-24DOI: 10.1109/SECON.1998.673352
Y.F. Chen, N. Warsi
In recent years, researchers from knowledge-based system (KBS) fields have pushed toward rapidly develop a reusable knowledge base with a greater flexibility and adaptability to empower domain experts developing their own domain-oriented high performance knowledge-based systems. We develop a strategic-reuse system that takes as input a declarative description of a domain, and then automatically generates as output an efficient, domain-specific KBS development environment along with a reusable knowledge base library. A test plan can be further developed based on the relationships between the specific KBS performance requirement and the KB components' strategic characteristics. This paper focuses on developing such a strategic-reuse framework to characterize KB components in terms of four generic strategic features: computational efficiency, interactive capability, modeling flexibility, and knowledge usability.
{"title":"A strategic reuse framework for high-performance knowledge bases development","authors":"Y.F. Chen, N. Warsi","doi":"10.1109/SECON.1998.673352","DOIUrl":"https://doi.org/10.1109/SECON.1998.673352","url":null,"abstract":"In recent years, researchers from knowledge-based system (KBS) fields have pushed toward rapidly develop a reusable knowledge base with a greater flexibility and adaptability to empower domain experts developing their own domain-oriented high performance knowledge-based systems. We develop a strategic-reuse system that takes as input a declarative description of a domain, and then automatically generates as output an efficient, domain-specific KBS development environment along with a reusable knowledge base library. A test plan can be further developed based on the relationships between the specific KBS performance requirement and the KB components' strategic characteristics. This paper focuses on developing such a strategic-reuse framework to characterize KB components in terms of four generic strategic features: computational efficiency, interactive capability, modeling flexibility, and knowledge usability.","PeriodicalId":281991,"journal":{"name":"Proceedings IEEE Southeastcon '98 'Engineering for a New Era'","volume":"95 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133679039","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 : 1998-04-24DOI: 10.1109/SECON.1998.673343
M.C. Smith, L. Dunleavy
This study compares current and projected state-of-the-art microwave power amplifiers used in spaceborne transmitter technologies at frequencies through 100 GHz. Projected are future trends in power PHEMTs and in wide bandgap semiconductor devices such as GaN and SiC. Also, the more established InP HEMT low-noise devices are examined for possible power amp applications specifically in the millimeter wave region. Three key power amplifier technologies, including the traveling wave tube amplifier (TWTA), the solid state power amplifier (SSPA), and the microwave power module (MPM), have emerged in varying degrees as heritaged and/or viable components in spaceborne transmitters. Addressed as figures of merit are significant discriminators such as long term reliability, space heritage (failure-free on orbit performance), process/device maturity, size, weight, and efficiency.
{"title":"Comparison of solid state, MPM, and TWT based transmitters for spaceborne applications","authors":"M.C. Smith, L. Dunleavy","doi":"10.1109/SECON.1998.673343","DOIUrl":"https://doi.org/10.1109/SECON.1998.673343","url":null,"abstract":"This study compares current and projected state-of-the-art microwave power amplifiers used in spaceborne transmitter technologies at frequencies through 100 GHz. Projected are future trends in power PHEMTs and in wide bandgap semiconductor devices such as GaN and SiC. Also, the more established InP HEMT low-noise devices are examined for possible power amp applications specifically in the millimeter wave region. Three key power amplifier technologies, including the traveling wave tube amplifier (TWTA), the solid state power amplifier (SSPA), and the microwave power module (MPM), have emerged in varying degrees as heritaged and/or viable components in spaceborne transmitters. Addressed as figures of merit are significant discriminators such as long term reliability, space heritage (failure-free on orbit performance), process/device maturity, size, weight, and efficiency.","PeriodicalId":281991,"journal":{"name":"Proceedings IEEE Southeastcon '98 'Engineering for a New Era'","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131034965","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 : 1998-04-24DOI: 10.1109/SECON.1998.673307
M. Telep, C. Christodoulou
CBS3DS is a radar cross section (RCS) analysis tool used to compute the backscattering RCS of a cavity backed aperture or slot in an infinite ground plane. The programs implement the hybrid finite element method and method of moments techniques and can analyze arbitrarily shaped three-dimensional cavities or slots filled with inhomogeneous, lossy materials. CBS3DS requires two data files defining the geometry of the problem and the electrical characteristics of the medium. This paper presents the development of an interface between the FEMAP finite element modeler and the modified CBS3DS programs. Fmpp5.m is a MATLAB m-file developed to overcome the limitations of FEMAP for this purpose and produce the required data files for CBS3DS. Fmpp5.m produces tetrahedral meshing from the hexahedral meshing provided by FEMAP and assigns electrical characteristics to the elements within the cavity or slot. Fmpp5.m writes the geometry input data file for CBS3DS which includes the coordinates of the nodes, the identification of nodes forming each tetrahedral volume element and triangular surface element, and the segregation of triangular elements into groups belonging to perfect electric conductor (PEC) surfaces or apertures.
{"title":"Interface development and modification of CBS3DS radar cross section analysis tool","authors":"M. Telep, C. Christodoulou","doi":"10.1109/SECON.1998.673307","DOIUrl":"https://doi.org/10.1109/SECON.1998.673307","url":null,"abstract":"CBS3DS is a radar cross section (RCS) analysis tool used to compute the backscattering RCS of a cavity backed aperture or slot in an infinite ground plane. The programs implement the hybrid finite element method and method of moments techniques and can analyze arbitrarily shaped three-dimensional cavities or slots filled with inhomogeneous, lossy materials. CBS3DS requires two data files defining the geometry of the problem and the electrical characteristics of the medium. This paper presents the development of an interface between the FEMAP finite element modeler and the modified CBS3DS programs. Fmpp5.m is a MATLAB m-file developed to overcome the limitations of FEMAP for this purpose and produce the required data files for CBS3DS. Fmpp5.m produces tetrahedral meshing from the hexahedral meshing provided by FEMAP and assigns electrical characteristics to the elements within the cavity or slot. Fmpp5.m writes the geometry input data file for CBS3DS which includes the coordinates of the nodes, the identification of nodes forming each tetrahedral volume element and triangular surface element, and the segregation of triangular elements into groups belonging to perfect electric conductor (PEC) surfaces or apertures.","PeriodicalId":281991,"journal":{"name":"Proceedings IEEE Southeastcon '98 'Engineering for a New Era'","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134492238","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 : 1998-04-24DOI: 10.1109/SECON.1998.673289
S. Wunnava, T. Williams
There has been an explosion of multimedia transfers involving audio, video, and data for applications such as: distance learning, interactive messaging, virtual design center implementations etc. Also, the intranet concept of grouping several remote locations for a virtual LAN is gaining wide acceptance. In pursuit of applications in such interactive multimedia environments globally, the need exists for software and system platforms, which will render reliable communications among the units, interfaced to the Internet. The authors have developed concept and working models of VideoNet and VoiceNet, in which such interactive video and audio information exchanges take place through the Internet. In addition, to help interactive messaging among the end users, WindowsChat and JavaChat modules have been developed and model schemes implemented. In this article, the authors present the VideoNet, VoiceNet, WindowsChat, and JavaChat concepts and implementation schemes.
{"title":"Internet based interactive multimedia transfers and applications","authors":"S. Wunnava, T. Williams","doi":"10.1109/SECON.1998.673289","DOIUrl":"https://doi.org/10.1109/SECON.1998.673289","url":null,"abstract":"There has been an explosion of multimedia transfers involving audio, video, and data for applications such as: distance learning, interactive messaging, virtual design center implementations etc. Also, the intranet concept of grouping several remote locations for a virtual LAN is gaining wide acceptance. In pursuit of applications in such interactive multimedia environments globally, the need exists for software and system platforms, which will render reliable communications among the units, interfaced to the Internet. The authors have developed concept and working models of VideoNet and VoiceNet, in which such interactive video and audio information exchanges take place through the Internet. In addition, to help interactive messaging among the end users, WindowsChat and JavaChat modules have been developed and model schemes implemented. In this article, the authors present the VideoNet, VoiceNet, WindowsChat, and JavaChat concepts and implementation schemes.","PeriodicalId":281991,"journal":{"name":"Proceedings IEEE Southeastcon '98 'Engineering for a New Era'","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115265539","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 : 1998-04-24DOI: 10.1109/SECON.1998.673381
B.E. Petrasko, B. Boucard
This paper describes and critiques an effort which uses VHDL for the system level performance modeling of a multicomputer system, a HLA-compliant federation. An object-oriented-like object model is developed for the federation and it is implemented in VHDL. The baseline federation model uses a centralized RTI. The federation and the three submodels of the federation are implemented as entities and component objects of the entities are implemented as record types. The use of record types precludes the use of compiled VHDL, which slows the simulation considerably.
{"title":"VHDL for performance modeling of HLA-compliant simulations","authors":"B.E. Petrasko, B. Boucard","doi":"10.1109/SECON.1998.673381","DOIUrl":"https://doi.org/10.1109/SECON.1998.673381","url":null,"abstract":"This paper describes and critiques an effort which uses VHDL for the system level performance modeling of a multicomputer system, a HLA-compliant federation. An object-oriented-like object model is developed for the federation and it is implemented in VHDL. The baseline federation model uses a centralized RTI. The federation and the three submodels of the federation are implemented as entities and component objects of the entities are implemented as record types. The use of record types precludes the use of compiled VHDL, which slows the simulation considerably.","PeriodicalId":281991,"journal":{"name":"Proceedings IEEE Southeastcon '98 'Engineering for a New Era'","volume":"456 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115345956","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 : 1998-04-24DOI: 10.1109/SECON.1998.673281
E. Sheybani, R. Sankar
Signal decomposition is particularly important for representing the signal components whose localization in time and frequency vary widely. The complexity of structures encountered in some signals requires adaptive low level decomposition. Signal decomposition finds applications in a wide range of areas such as signal compression, denoising, separation and extraction. This paper describes some of the tools developed for this type decomposition, starting with the short time Fourier transform (STFT) for basic decomposition, leading to the wavelet transform (WT) and matching pursuit (MP) for applications that are more sensitive and require details.
{"title":"Multiresolution decomposition techniques for robust signal processing","authors":"E. Sheybani, R. Sankar","doi":"10.1109/SECON.1998.673281","DOIUrl":"https://doi.org/10.1109/SECON.1998.673281","url":null,"abstract":"Signal decomposition is particularly important for representing the signal components whose localization in time and frequency vary widely. The complexity of structures encountered in some signals requires adaptive low level decomposition. Signal decomposition finds applications in a wide range of areas such as signal compression, denoising, separation and extraction. This paper describes some of the tools developed for this type decomposition, starting with the short time Fourier transform (STFT) for basic decomposition, leading to the wavelet transform (WT) and matching pursuit (MP) for applications that are more sensitive and require details.","PeriodicalId":281991,"journal":{"name":"Proceedings IEEE Southeastcon '98 'Engineering for a New Era'","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114215930","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 : 1998-04-24DOI: 10.1109/SECON.1998.673290
J. Scott, J. Sztipanovits, T. Bapty, A. Misra, M. Moore
Real-time systems are used in many critical applications. Verification of these real-time systems is essential. Presented here is a method for modeling real-time systems and computing the model's timing characteristics automatically. From a data-driven model of the system an equivalent finite state machine representation of the system is produced by this package. To provide efficient traversal of this large state space an ordered binary decision diagram (OBDD) is used to represent the state machine using symbolic methods. Algorithms have been developed to find the largest and smallest distance (times) between any two state sets. From these algorithms schedulability of the real-time system can be determined.
{"title":"A method for modeling and verification of real-time systems","authors":"J. Scott, J. Sztipanovits, T. Bapty, A. Misra, M. Moore","doi":"10.1109/SECON.1998.673290","DOIUrl":"https://doi.org/10.1109/SECON.1998.673290","url":null,"abstract":"Real-time systems are used in many critical applications. Verification of these real-time systems is essential. Presented here is a method for modeling real-time systems and computing the model's timing characteristics automatically. From a data-driven model of the system an equivalent finite state machine representation of the system is produced by this package. To provide efficient traversal of this large state space an ordered binary decision diagram (OBDD) is used to represent the state machine using symbolic methods. Algorithms have been developed to find the largest and smallest distance (times) between any two state sets. From these algorithms schedulability of the real-time system can be determined.","PeriodicalId":281991,"journal":{"name":"Proceedings IEEE Southeastcon '98 'Engineering for a New Era'","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124019819","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 : 1998-04-24DOI: 10.1109/SECON.1998.673378
C. Arjhan, R. G. Deshmukh
In this paper a new fault-detection model, pair faults (pf), is presented to show that the entire 'O' carry-tree of Brent-Kung adder is testable contrary to Becker's proof. This model is also used to detect multiple faults for both regular and irregular carry-tree layouts. There are n+1 test patterns which can be applied (n is the operand width) through pipelining the primary inputs of the carry-tree. For this purpose, three new lemmas, one pf-model and their proofs are presented.
{"title":"A novel fault-model for regular and irregular parallel-prefix adders","authors":"C. Arjhan, R. G. Deshmukh","doi":"10.1109/SECON.1998.673378","DOIUrl":"https://doi.org/10.1109/SECON.1998.673378","url":null,"abstract":"In this paper a new fault-detection model, pair faults (pf), is presented to show that the entire 'O' carry-tree of Brent-Kung adder is testable contrary to Becker's proof. This model is also used to detect multiple faults for both regular and irregular carry-tree layouts. There are n+1 test patterns which can be applied (n is the operand width) through pipelining the primary inputs of the carry-tree. For this purpose, three new lemmas, one pf-model and their proofs are presented.","PeriodicalId":281991,"journal":{"name":"Proceedings IEEE Southeastcon '98 'Engineering for a New Era'","volume":"173 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124231351","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 : 1998-04-24DOI: 10.1109/SECON.1998.673341
P. Herzig, M. Wrubel, B. Boller
The SeaWinds instrument is a spaceborne scatterometer due to be launched in the year 2000 on the Japanese Advanced Earth Observation Satellite (ADEOS) II platform. Its mission is to measure wind speed and direction over the Earth's ice-free oceans. The SES, the heart of the scatterometer, is being built by Raytheon E-Systems and is responsible for measuring the normalized ocean scattering coefficient, /spl sigma//sub 0/, from which the wind vector is derived. This paper discusses the pre-launch calibration of the SES that ensures on-orbit performance meets the mission's requirements.
{"title":"Pre-launch calibration of the SeaWinds scatterometer electronics subsystem","authors":"P. Herzig, M. Wrubel, B. Boller","doi":"10.1109/SECON.1998.673341","DOIUrl":"https://doi.org/10.1109/SECON.1998.673341","url":null,"abstract":"The SeaWinds instrument is a spaceborne scatterometer due to be launched in the year 2000 on the Japanese Advanced Earth Observation Satellite (ADEOS) II platform. Its mission is to measure wind speed and direction over the Earth's ice-free oceans. The SES, the heart of the scatterometer, is being built by Raytheon E-Systems and is responsible for measuring the normalized ocean scattering coefficient, /spl sigma//sub 0/, from which the wind vector is derived. This paper discusses the pre-launch calibration of the SES that ensures on-orbit performance meets the mission's requirements.","PeriodicalId":281991,"journal":{"name":"Proceedings IEEE Southeastcon '98 'Engineering for a New Era'","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122527450","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 : 1998-04-24DOI: 10.1109/SECON.1998.673380
H. Abujbara
In this paper a new fault model is proposed which accounts for both degrading and catastrophic fault types, which exist in WSI/VLSI designs. Fault degrading is the result of a defect mechanism which has no effect on the logical behavior of the circuit, but rather causes performance degradation to the circuit. This degradation is manifested in poor signal propagation delays, and weak noise immunity. However, there are no testing techniques and no fault models that are capable of handling the testing of the degrading fault by using digital fault simulation. A defect model that is capable of mapping degrading defects syndrome into a Boolean behavior (syndrome) would make it possible to use higher speed digital fault simulation techniques, rather than analog parametric testing. This approach for testing is more reliable and would cover both degrading and fatal (catastrophic) faults in the system.
{"title":"The degrading and catastrophic fault model for WSI circuits","authors":"H. Abujbara","doi":"10.1109/SECON.1998.673380","DOIUrl":"https://doi.org/10.1109/SECON.1998.673380","url":null,"abstract":"In this paper a new fault model is proposed which accounts for both degrading and catastrophic fault types, which exist in WSI/VLSI designs. Fault degrading is the result of a defect mechanism which has no effect on the logical behavior of the circuit, but rather causes performance degradation to the circuit. This degradation is manifested in poor signal propagation delays, and weak noise immunity. However, there are no testing techniques and no fault models that are capable of handling the testing of the degrading fault by using digital fault simulation. A defect model that is capable of mapping degrading defects syndrome into a Boolean behavior (syndrome) would make it possible to use higher speed digital fault simulation techniques, rather than analog parametric testing. This approach for testing is more reliable and would cover both degrading and fatal (catastrophic) faults in the system.","PeriodicalId":281991,"journal":{"name":"Proceedings IEEE Southeastcon '98 'Engineering for a New Era'","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124866285","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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