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Proceedings of the 1990 IEEE Colloquium in South America最新文献

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Applications of neural networks in biomedical engineering 神经网络在生物医学工程中的应用
Proceedings of the 1990 IEEE Colloquium in South America Pub Date : 1990-08-31 DOI: 10.1109/COLLOQ.1990.152784
E. Micheli-Tzanakou
{"title":"Applications of neural networks in biomedical engineering","authors":"E. Micheli-Tzanakou","doi":"10.1109/COLLOQ.1990.152784","DOIUrl":"https://doi.org/10.1109/COLLOQ.1990.152784","url":null,"abstract":"The author presents an iterative optimization procedure to achieve the goals of furthering the understanding of brain functions so that an artificial visual system can be built. The applications of these algorithms are almost unlimited. Examples are presented in visual evoked potentials, pattern recognition and real time reduction of motion artifacts.<<ETX>>","PeriodicalId":432127,"journal":{"name":"Proceedings of the 1990 IEEE Colloquium in South America","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115480776","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}
引用次数: 4
Pre-reconstruction restoration versus post-reconstruction restoration of single photon emission computed tomography images 单光子发射计算机断层扫描图像的重建前恢复与重建后恢复
Proceedings of the 1990 IEEE Colloquium in South America Pub Date : 1990-08-31 DOI: 10.1109/COLLOQ.1990.152813
D. Boulfelfel, R. Rangayyan, L. Hahn, R. Kloiber
{"title":"Pre-reconstruction restoration versus post-reconstruction restoration of single photon emission computed tomography images","authors":"D. Boulfelfel, R. Rangayyan, L. Hahn, R. Kloiber","doi":"10.1109/COLLOQ.1990.152813","DOIUrl":"https://doi.org/10.1109/COLLOQ.1990.152813","url":null,"abstract":"Restoration of single photon emission computer tomography (SPECT) images may be performed either before reconstruction (pre-reconstruction restoration) or after reconstruction (post-reconstruction restoration) from planar (projection) images. The authors present a comparison of results obtained by these two methods. The filters investigated in this study are the Wiener and power spectrum equalization filters. The filters were applied to SPECT images of a hollow cylinder phantom and a cardiac phantom acquired on a Siemens Rota camera. Quantitative analysis of the results were performed through measurements of contrast ratios and root mean squared errors. The pre-reconstruction restored images show a significant decrease in the root mean squared error and an increase in contrast over the post-reconstruction restored images.<<ETX>>","PeriodicalId":432127,"journal":{"name":"Proceedings of the 1990 IEEE Colloquium in South America","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125915970","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}
引用次数: 3
Recent trends in reliability of large industrial power systems 大型工业电力系统可靠性的最新趋势
Proceedings of the 1990 IEEE Colloquium in South America Pub Date : 1990-08-31 DOI: 10.1109/COLLOQ.1990.152821
D. J. Love
{"title":"Recent trends in reliability of large industrial power systems","authors":"D. J. Love","doi":"10.1109/COLLOQ.1990.152821","DOIUrl":"https://doi.org/10.1109/COLLOQ.1990.152821","url":null,"abstract":"The author stresses the challenges and complexities facing an engineer when designing a new facility or retrofitting an existing industrial power system. Industrial facilities are making more efficient use of their energy from all sources, with cogeneration being prevalent, as plants generate electricity for self-consumption and for sale to utilities. Inverter systems for uninterruptible power supplies and adjustable speed drives for AC motors also generate harmonic voltages which adversely affect the power quality. Power quality affects the reliability of the plant system. Plant shutdowns due to computer or machine tool logic failures can be as expensive as those caused by a power supply interruption or an inadequately designed industrial facility.<<ETX>>","PeriodicalId":432127,"journal":{"name":"Proceedings of the 1990 IEEE Colloquium in South America","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128847645","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}
引用次数: 0
Open architecture distributed processing-the modern design for electric power network automation 开放体系结构分布式处理——电网自动化的现代设计
Proceedings of the 1990 IEEE Colloquium in South America Pub Date : 1990-08-31 DOI: 10.1109/COLLOQ.1990.152822
T. W. Hissey, J. Peca
{"title":"Open architecture distributed processing-the modern design for electric power network automation","authors":"T. W. Hissey, J. Peca","doi":"10.1109/COLLOQ.1990.152822","DOIUrl":"https://doi.org/10.1109/COLLOQ.1990.152822","url":null,"abstract":"The authors explore a new design concept for electric power network automation-an open architecture distributed processor based supervisory control and data acquisition (SCADA) and SCADA/EMS (energy management system). Good quality, availability, and reliability of the electric power supply is important to people throughout the world. Therefore, the electric power network automation systems must be capable of performing all the time. Also, it is important that the monitoring systems and control systems utilized are very responsive to the power system operator needs-particularly in problem times. The distributed processor architecture design accomplishes such performance, while allowing growth in size and complexity of the system being monitored and controlled.<<ETX>>","PeriodicalId":432127,"journal":{"name":"Proceedings of the 1990 IEEE Colloquium in South America","volume":"176 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125490608","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}
引用次数: 0
Emitter drive: a technique to drive a bipolar power transistor switching at 100 kHz 发射极驱动:一种驱动双极功率晶体管在100khz下开关的技术
Proceedings of the 1990 IEEE Colloquium in South America Pub Date : 1990-08-31 DOI: 10.1109/COLLOQ.1990.152828
G. Casaravilla, F. Silveira
{"title":"Emitter drive: a technique to drive a bipolar power transistor switching at 100 kHz","authors":"G. Casaravilla, F. Silveira","doi":"10.1109/COLLOQ.1990.152828","DOIUrl":"https://doi.org/10.1109/COLLOQ.1990.152828","url":null,"abstract":"Theoretical support and experimental results concerning the application of an emitter driven bipolar power transistor to a 400 V 10 A power switch are presented. The central idea of the emitter drive is to turn off and on the bipolar transistor controlling the flow of the emitter current, using another switch. This switch was implemented with a low voltage power MOSFET. In this way it is possible to achieve a power switch with fairly high voltage rating, without excessive forward voltage drop (not achievable using power MOSFETS), and greater speed than by means of a bipolar transistor using the traditional base drive.<<ETX>>","PeriodicalId":432127,"journal":{"name":"Proceedings of the 1990 IEEE Colloquium in South America","volume":"639 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122951033","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}
引用次数: 3
Signal averaging in stress test and Holter systems 压力测试和动态心电图系统的信号平均
Proceedings of the 1990 IEEE Colloquium in South America Pub Date : 1990-08-31 DOI: 10.1109/COLLOQ.1990.152786
H. Palacios, D. Rodríguez, J. Castro, V. Gomez, J. Jorquera, T. Magdhal
{"title":"Signal averaging in stress test and Holter systems","authors":"H. Palacios, D. Rodríguez, J. Castro, V. Gomez, J. Jorquera, T. Magdhal","doi":"10.1109/COLLOQ.1990.152786","DOIUrl":"https://doi.org/10.1109/COLLOQ.1990.152786","url":null,"abstract":"A signal averaging technique is presented as a high quality alternative for filtering and cleaning ECG signals. A basic mathematical approach is first presented, with emphasis on the bandwidth reduction due to imperfect synchronism, when the QRS complex and R wave peak are used for synchronizing and alignment. A very reliable method is presented, especially designed for noisy ECG signals; in this method several thresholds are generated, based on the history of the successive cycles; thresholds for the amplitude of high pass filtered ECG signals and their first derivatives are generated in an adaptive and stable way. Finally, results are shown for several typical cases, including static averaging and dynamic real-time averaging.<<ETX>>","PeriodicalId":432127,"journal":{"name":"Proceedings of the 1990 IEEE Colloquium in South America","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125629352","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}
引用次数: 0
The role of IEEE in engineering accreditation IEEE在工程认证中的作用
Proceedings of the 1990 IEEE Colloquium in South America Pub Date : 1990-08-31 DOI: 10.1109/COLLOQ.1990.152805
J. D. Irwin
{"title":"The role of IEEE in engineering accreditation","authors":"J. D. Irwin","doi":"10.1109/COLLOQ.1990.152805","DOIUrl":"https://doi.org/10.1109/COLLOQ.1990.152805","url":null,"abstract":"One of the most significant activities which the IEEE conducts in the area of education is accreditation. In addition, this activity is of critical importance to a significant portion of the members of the Education Society. Within the United States, IEEE is a participating body of the Accreditation Board for Engineering and Technology (ABET), which has been designated by the US Government as the entity for accrediting programs in engineering and technology. As the world moves toward a global economy and engineering talent flows among countries throughout the world, the need for cooperation in accreditation will increase. As a worldwide organization, the IEEE is strategically positioned to play a vital and central role in engineering accreditation on an international scale. The author examines the IEEE's position within the US accreditation structure, the worldwide environment for accreditation, the international issues which are currently being addressed, and finally some potential future directions.<<ETX>>","PeriodicalId":432127,"journal":{"name":"Proceedings of the 1990 IEEE Colloquium in South America","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127979088","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}
引用次数: 0
Expanding the Uruguayan public packet network: new architectures for the main switch 扩展乌拉圭公共分组网络:主交换机的新架构
Proceedings of the 1990 IEEE Colloquium in South America Pub Date : 1990-08-31 DOI: 10.1109/COLLOQ.1990.152800
J. Grompone, O. Barreneche
{"title":"Expanding the Uruguayan public packet network: new architectures for the main switch","authors":"J. Grompone, O. Barreneche","doi":"10.1109/COLLOQ.1990.152800","DOIUrl":"https://doi.org/10.1109/COLLOQ.1990.152800","url":null,"abstract":"The authors discuss the expansion of the main switch in the Uruguayan public packet network (URUPAC). The switch is an indigenous development based on several prior designs for the telex and data public networks. The advantages of a distributed architecture are presented. The choice of a communication bus was in the past a very difficult item. Several alternatives are discussed according to the expected network growth (from 64 to 512 communication ports). The best alternative is to use a local network to link concentrators and processors. IEEE 802.3 is a suited protocol. The maximum growth capacity is discussed in this case.<<ETX>>","PeriodicalId":432127,"journal":{"name":"Proceedings of the 1990 IEEE Colloquium in South America","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122368778","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}
引用次数: 0
A microcomputer-based system for mapping EEG signals after source derivation 一种基于微机的脑电信号源推导后映射系统
Proceedings of the 1990 IEEE Colloquium in South America Pub Date : 1990-08-31 DOI: 10.1109/COLLOQ.1990.152787
A. Infantosi, A. Almeida
{"title":"A microcomputer-based system for mapping EEG signals after source derivation","authors":"A. Infantosi, A. Almeida","doi":"10.1109/COLLOQ.1990.152787","DOIUrl":"https://doi.org/10.1109/COLLOQ.1990.152787","url":null,"abstract":"The EEG (electroencephalogram) data are obtained as a set of up to 16 unipolar derivations, sampled and displayed in real time, before storing on disk. The source derivation technique counteracts the smearing of the electrical fields as measured on the scalp and thus improves the spatial selectivity of mapping. It is calculated using the finite difference method, assuming a uniform grid of electrodes or alternatively a non-uniform grid. Source derivation is applied to the data before estimating the power spectral density function (using FFT) from selected epochs of the signals. Spectral parameters can then be extracted and mapped on a surface corresponding to the lateral projection of a brain hemisphere. Spatial interpolation is employed to estimate the parameter values at points where no electrodes are located. The brain topograms are then exhibited on the computer monitor. The software was written in PASCAL with time-critical routines in assembly language.<<ETX>>","PeriodicalId":432127,"journal":{"name":"Proceedings of the 1990 IEEE Colloquium in South America","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124321902","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}
引用次数: 5
Influence of modeling in load flow analysis of three phase distribution systems 建模对三相配电系统潮流分析的影响
Proceedings of the 1990 IEEE Colloquium in South America Pub Date : 1990-08-31 DOI: 10.1109/COLLOQ.1990.152825
H. Rudnick, M. Muñoz
{"title":"Influence of modeling in load flow analysis of three phase distribution systems","authors":"H. Rudnick, M. Muñoz","doi":"10.1109/COLLOQ.1990.152825","DOIUrl":"https://doi.org/10.1109/COLLOQ.1990.152825","url":null,"abstract":"The authors present a comparison of three phase load flow algorithms for distribution power systems. Reference is made to traditional single-phase load flow methods used in transmission systems and the main three-phase load flow methods used in distribution. Studies of two Chilean distribution networks are made with an algorithm based on the power summation method, and a comparison of errors and the influence of modeling are reported.<<ETX>>","PeriodicalId":432127,"journal":{"name":"Proceedings of the 1990 IEEE Colloquium in South America","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115750678","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}
引用次数: 11
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