Conference Proceedings. 10th Anniversary. IMTC/94. Advanced Technologies in I & M. 1994 IEEE Instrumentation and Measurement Technolgy Conference (Cat. No.94CH3424-9)最新文献
Pub Date : 1994-05-10DOI: 10.1109/IMTC.1994.351974
M. Begin, F. Ghannouchi, L. Selmi, B. Riccò
An innovative six-port network analyzer (SPNA) for characterizing GaAs MESFETs under pulsed bias and RF conditions is presented in this paper. This SPNA allows the measurements of instantaneous S parameters of microwave active devices. These S parameters may then be used to extract the electrical model elements (Cgs, Cgd, Gds, Gm, etc.) of the MESFET using standard procedures. This system is particularly suitable for studying trapping and self-heating effects in GaAs devices.<>
{"title":"Instantaneous S parameters measurements of MESFETs under burst bias conditions","authors":"M. Begin, F. Ghannouchi, L. Selmi, B. Riccò","doi":"10.1109/IMTC.1994.351974","DOIUrl":"https://doi.org/10.1109/IMTC.1994.351974","url":null,"abstract":"An innovative six-port network analyzer (SPNA) for characterizing GaAs MESFETs under pulsed bias and RF conditions is presented in this paper. This SPNA allows the measurements of instantaneous S parameters of microwave active devices. These S parameters may then be used to extract the electrical model elements (Cgs, Cgd, Gds, Gm, etc.) of the MESFET using standard procedures. This system is particularly suitable for studying trapping and self-heating effects in GaAs devices.<<ETX>>","PeriodicalId":231484,"journal":{"name":"Conference Proceedings. 10th Anniversary. IMTC/94. Advanced Technologies in I & M. 1994 IEEE Instrumentation and Measurement Technolgy Conference (Cat. No.94CH3424-9)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122381182","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 : 1994-05-10DOI: 10.1109/IMTC.1994.352048
L. Szczecinski, R. Morawski, A. Barwicz
The reconstruction of a measurand on the basis of measurement data which are subject to systematic distortions and random errors is a problem often met in instrumental applications. Different regularization techniques are used to deal with its ill-conditioning. In this paper the applicability of variational methods based on entropy-like criteria is studied. The quality of reconstruction is assessed using synthetic measurement data as well as real-world spectrophotometric data. Two proposed algorithms are compared with other methods frequently used for measurand reconstruction.<>
{"title":"Variational algorithms of measurand reconstruction based on entropy-like criteria","authors":"L. Szczecinski, R. Morawski, A. Barwicz","doi":"10.1109/IMTC.1994.352048","DOIUrl":"https://doi.org/10.1109/IMTC.1994.352048","url":null,"abstract":"The reconstruction of a measurand on the basis of measurement data which are subject to systematic distortions and random errors is a problem often met in instrumental applications. Different regularization techniques are used to deal with its ill-conditioning. In this paper the applicability of variational methods based on entropy-like criteria is studied. The quality of reconstruction is assessed using synthetic measurement data as well as real-world spectrophotometric data. Two proposed algorithms are compared with other methods frequently used for measurand reconstruction.<<ETX>>","PeriodicalId":231484,"journal":{"name":"Conference Proceedings. 10th Anniversary. IMTC/94. Advanced Technologies in I & M. 1994 IEEE Instrumentation and Measurement Technolgy Conference (Cat. No.94CH3424-9)","volume":"260 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122742721","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 : 1994-05-10DOI: 10.1109/IMTC.1994.352151
T. Musya
A realistic head shape allows accurate estimates of dipole positions and moments in which the effect of the skull which has low electric conductivity as compared with other parts of the brain is taken into consideration. Possible errors in position are less than 3 mm except for the basal region of the skull. Signal processing for visual and auditory stimuli or for sensation in time and space in the brain cortex is traced with the aid of this method. On the other hand, various different mental states (comfortable, uncomfortable states, state of mental stress, solving intelligent tasks etc.) cause different features in EEG. The Cocolyser described has the following features: real-time display; EEG waveforms after filtering; real-time display of potential maps, power maps, and spectral array; estimation of positions and moments of one or two equivalent dipoles for EEG and evoked potentials; spectrum of period fluctuations of the alpha rhythm and other specified components; automatic discrimination of mental states; and filing of EEG.<>
{"title":"Brain functions analyzing system \"Cocolyzer\"","authors":"T. Musya","doi":"10.1109/IMTC.1994.352151","DOIUrl":"https://doi.org/10.1109/IMTC.1994.352151","url":null,"abstract":"A realistic head shape allows accurate estimates of dipole positions and moments in which the effect of the skull which has low electric conductivity as compared with other parts of the brain is taken into consideration. Possible errors in position are less than 3 mm except for the basal region of the skull. Signal processing for visual and auditory stimuli or for sensation in time and space in the brain cortex is traced with the aid of this method. On the other hand, various different mental states (comfortable, uncomfortable states, state of mental stress, solving intelligent tasks etc.) cause different features in EEG. The Cocolyser described has the following features: real-time display; EEG waveforms after filtering; real-time display of potential maps, power maps, and spectral array; estimation of positions and moments of one or two equivalent dipoles for EEG and evoked potentials; spectrum of period fluctuations of the alpha rhythm and other specified components; automatic discrimination of mental states; and filing of EEG.<<ETX>>","PeriodicalId":231484,"journal":{"name":"Conference Proceedings. 10th Anniversary. IMTC/94. Advanced Technologies in I & M. 1994 IEEE Instrumentation and Measurement Technolgy Conference (Cat. No.94CH3424-9)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128467834","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 : 1994-05-10DOI: 10.1109/IMTC.1994.351901
Guo Shize, Sun Shenghe, Zhang Zhongting
The random equivalent sampling and sequential equivalent sampling are two equivalent sampling methods widely used in the Digital Storage Oscilloscopes. A novel equivalent sampling method which is called compound equivalent sampling is proposed in this paper. The method combines the high-speed of the random equivalent sampling with the high efficiency of the sequential equivalent sampling and can perform rapid and effective measurement for the periodic signal which is either fast-varying or slow-varying. The circuit using this method is also able to take real-time sampling to the single-shot signals.<>
{"title":"A novel equivalent sampling method using in the digital storage oscilloscopes","authors":"Guo Shize, Sun Shenghe, Zhang Zhongting","doi":"10.1109/IMTC.1994.351901","DOIUrl":"https://doi.org/10.1109/IMTC.1994.351901","url":null,"abstract":"The random equivalent sampling and sequential equivalent sampling are two equivalent sampling methods widely used in the Digital Storage Oscilloscopes. A novel equivalent sampling method which is called compound equivalent sampling is proposed in this paper. The method combines the high-speed of the random equivalent sampling with the high efficiency of the sequential equivalent sampling and can perform rapid and effective measurement for the periodic signal which is either fast-varying or slow-varying. The circuit using this method is also able to take real-time sampling to the single-shot signals.<<ETX>>","PeriodicalId":231484,"journal":{"name":"Conference Proceedings. 10th Anniversary. IMTC/94. Advanced Technologies in I & M. 1994 IEEE Instrumentation and Measurement Technolgy Conference (Cat. No.94CH3424-9)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127768959","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 : 1994-05-10DOI: 10.1109/IMTC.1994.351874
K. Terada, J. Yamaguchi, M. Nakajima
We have already proposed a method for identifying human faces using the three dimensional facial data obtained by setting the fiber grating vision sensor in front of the faces. But in the previous method, there are some problems that these facial data include redundant information because of the bilateral symmetry of the human faces, and in some case, the data behind the nose can't be obtained. In this paper, the authors describe a method for identifying individuals using the angled facial data obtained from the fiber grating vision sensor. We think that we can obtain the more effective data for identifying the faces by setting the fiber grating vision sensor at an angle to the faces. Because we can obtain the effective information from the large region of one side of the faces when we set the sensor like this. In this method, the fiber grating vision sensor which has been developed by the authors, is employed for the three dimensional shape of the faces. Before identifying the facial data, it is necessary to calibrate the position and direction of the facial data. In this method, a set of the directions of normal vectors at data points on the facial surface is obtained, and calibrations are carried out in accordance with the extend of errors in the sets. To identify the human faces, a multi-layered neural network is used in which the inputs are two component values of normal vector on the facial surface. The experiments using the experimental system are performed to demonstrate the efficacy of this method and the experimental results are shown.<>
{"title":"A method for identifying individuals using angled facial data obtained by bright-spots matrix projection","authors":"K. Terada, J. Yamaguchi, M. Nakajima","doi":"10.1109/IMTC.1994.351874","DOIUrl":"https://doi.org/10.1109/IMTC.1994.351874","url":null,"abstract":"We have already proposed a method for identifying human faces using the three dimensional facial data obtained by setting the fiber grating vision sensor in front of the faces. But in the previous method, there are some problems that these facial data include redundant information because of the bilateral symmetry of the human faces, and in some case, the data behind the nose can't be obtained. In this paper, the authors describe a method for identifying individuals using the angled facial data obtained from the fiber grating vision sensor. We think that we can obtain the more effective data for identifying the faces by setting the fiber grating vision sensor at an angle to the faces. Because we can obtain the effective information from the large region of one side of the faces when we set the sensor like this. In this method, the fiber grating vision sensor which has been developed by the authors, is employed for the three dimensional shape of the faces. Before identifying the facial data, it is necessary to calibrate the position and direction of the facial data. In this method, a set of the directions of normal vectors at data points on the facial surface is obtained, and calibrations are carried out in accordance with the extend of errors in the sets. To identify the human faces, a multi-layered neural network is used in which the inputs are two component values of normal vector on the facial surface. The experiments using the experimental system are performed to demonstrate the efficacy of this method and the experimental results are shown.<<ETX>>","PeriodicalId":231484,"journal":{"name":"Conference Proceedings. 10th Anniversary. IMTC/94. Advanced Technologies in I & M. 1994 IEEE Instrumentation and Measurement Technolgy Conference (Cat. No.94CH3424-9)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124870552","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 : 1994-05-10DOI: 10.1109/IMTC.1994.351961
Kiseon Kim
Analog-to-digital conversion pertaining to the rotating coil-based magnetic field measurement systems requires an angular positioning as a sample-timing reference, which inherently introduces unwanted harmonics due to the positioning jitter. We have adopted two practical models for the positioning jitter: a random positioning and a systematic positioning errors. For each positioning error, we analyzed the magnitude of the harmonics. Further, we have introduced a positioning correction scheme to reduce the unwanted harmonics, and analyzed the reduced magnitude to show its significance or the multipole measurement system design.<>
{"title":"Analog-to-digital conversion and harmonics due to the angular positioning error in magnetic field measurement","authors":"Kiseon Kim","doi":"10.1109/IMTC.1994.351961","DOIUrl":"https://doi.org/10.1109/IMTC.1994.351961","url":null,"abstract":"Analog-to-digital conversion pertaining to the rotating coil-based magnetic field measurement systems requires an angular positioning as a sample-timing reference, which inherently introduces unwanted harmonics due to the positioning jitter. We have adopted two practical models for the positioning jitter: a random positioning and a systematic positioning errors. For each positioning error, we analyzed the magnitude of the harmonics. Further, we have introduced a positioning correction scheme to reduce the unwanted harmonics, and analyzed the reduced magnitude to show its significance or the multipole measurement system design.<<ETX>>","PeriodicalId":231484,"journal":{"name":"Conference Proceedings. 10th Anniversary. IMTC/94. Advanced Technologies in I & M. 1994 IEEE Instrumentation and Measurement Technolgy Conference (Cat. No.94CH3424-9)","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122825077","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 : 1994-05-10DOI: 10.1109/IMTC.1994.351790
A. Kozlov, I. B. Yakovkin
In this paper we consider two kinds of tag based on surface acoustic wave (SAW) devices and different terminal equipment for registration of these tags. Experimental parameters of tags and an interrogated equipment are considered.<>
{"title":"SAW elements in identification systems","authors":"A. Kozlov, I. B. Yakovkin","doi":"10.1109/IMTC.1994.351790","DOIUrl":"https://doi.org/10.1109/IMTC.1994.351790","url":null,"abstract":"In this paper we consider two kinds of tag based on surface acoustic wave (SAW) devices and different terminal equipment for registration of these tags. Experimental parameters of tags and an interrogated equipment are considered.<<ETX>>","PeriodicalId":231484,"journal":{"name":"Conference Proceedings. 10th Anniversary. IMTC/94. Advanced Technologies in I & M. 1994 IEEE Instrumentation and Measurement Technolgy Conference (Cat. No.94CH3424-9)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121684237","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 : 1994-05-10DOI: 10.1109/IMTC.1994.351940
M. Yamashita
In order to clarify the information processing of calculation in a brain, the event-related potentials (ERPs) elicited during the calculation task were measured. However, the ERPs associated with calculation were small amplitude, and the latency of it were unknown. Then, a new method named the sequential difference method was introduced, and succeeded to detect the signal clearly. The detected calculation-relevant waveform appeared followed the P3 in the opposite polarity. The distribution of the ERPs associated with calculation on a head were analyzed by the topography. The results showed that the responsible area for calculation was parietal region in the left hemisphere of the brain.<>
{"title":"The analysis of event-related potentials elicited during calculation task using the sequential difference method","authors":"M. Yamashita","doi":"10.1109/IMTC.1994.351940","DOIUrl":"https://doi.org/10.1109/IMTC.1994.351940","url":null,"abstract":"In order to clarify the information processing of calculation in a brain, the event-related potentials (ERPs) elicited during the calculation task were measured. However, the ERPs associated with calculation were small amplitude, and the latency of it were unknown. Then, a new method named the sequential difference method was introduced, and succeeded to detect the signal clearly. The detected calculation-relevant waveform appeared followed the P3 in the opposite polarity. The distribution of the ERPs associated with calculation on a head were analyzed by the topography. The results showed that the responsible area for calculation was parietal region in the left hemisphere of the brain.<<ETX>>","PeriodicalId":231484,"journal":{"name":"Conference Proceedings. 10th Anniversary. IMTC/94. Advanced Technologies in I & M. 1994 IEEE Instrumentation and Measurement Technolgy Conference (Cat. No.94CH3424-9)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121940979","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 : 1994-05-10DOI: 10.1109/IMTC.1994.351840
J. Nakamura, Y. Tomita, S. Honda
Particle Image Velocimetry (PIV) measures two-dimensional in-plane flow vectors without disturbing the flow. The multiple exposure photo of the particles suspended into the flow has been used to give the flow velocity vector. Because of the photo developing process, the PIV has not measured in real-time. To process in real-time, we propose an optical PIV system of the spatial filtering technique using a Liquid Crystal Display.<>
{"title":"Real time particle image velocimetry using liquid crystal display","authors":"J. Nakamura, Y. Tomita, S. Honda","doi":"10.1109/IMTC.1994.351840","DOIUrl":"https://doi.org/10.1109/IMTC.1994.351840","url":null,"abstract":"Particle Image Velocimetry (PIV) measures two-dimensional in-plane flow vectors without disturbing the flow. The multiple exposure photo of the particles suspended into the flow has been used to give the flow velocity vector. Because of the photo developing process, the PIV has not measured in real-time. To process in real-time, we propose an optical PIV system of the spatial filtering technique using a Liquid Crystal Display.<<ETX>>","PeriodicalId":231484,"journal":{"name":"Conference Proceedings. 10th Anniversary. IMTC/94. Advanced Technologies in I & M. 1994 IEEE Instrumentation and Measurement Technolgy Conference (Cat. No.94CH3424-9)","volume":"352 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122757047","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 : 1994-05-10DOI: 10.1109/IMTC.1994.352017
M. Catelani, P. Salvaneschi, A. Zanobini, M. Mugnaini
In this paper an application of Logarithmic Poisson Execution Time Model to the software product MIDAS is presented. In order to cope with the maintenance effort we predict an index of user's satisfaction according to the failure intensity predicted by the model. A trade-off between maintenance task and user's satisfaction achieved.<>
{"title":"Use of software reliability models for the maintenance of information systems: a case study","authors":"M. Catelani, P. Salvaneschi, A. Zanobini, M. Mugnaini","doi":"10.1109/IMTC.1994.352017","DOIUrl":"https://doi.org/10.1109/IMTC.1994.352017","url":null,"abstract":"In this paper an application of Logarithmic Poisson Execution Time Model to the software product MIDAS is presented. In order to cope with the maintenance effort we predict an index of user's satisfaction according to the failure intensity predicted by the model. A trade-off between maintenance task and user's satisfaction achieved.<<ETX>>","PeriodicalId":231484,"journal":{"name":"Conference Proceedings. 10th Anniversary. IMTC/94. Advanced Technologies in I & M. 1994 IEEE Instrumentation and Measurement Technolgy Conference (Cat. No.94CH3424-9)","volume":"439 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122887148","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}
Conference Proceedings. 10th Anniversary. IMTC/94. Advanced Technologies in I & M. 1994 IEEE Instrumentation and Measurement Technolgy Conference (Cat. No.94CH3424-9)
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