2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)最新文献
Pub Date : 2000-05-29DOI: 10.1109/MELCON.2000.879994
A. Goluban, I. Mihajlovic, L. Budin
This paper deals with reconstruction filters and appropriate prefiltering techniques in the volume rendering. Sampling, resampling and reconstruction of continuous functions are used in many different fields. To satisfy conditions of Shannon's theorem, prefiltering of images or data volumes is usually required before sampling. The usual approach is to use a Gaussian prefilter, where the cutoff frequency is determined by the sampling rate, and one of the different reconstruction schemes is then applied. The problem is to determine a prefilter so that the reconstruction will reproduce the original object as accurately as possible. If the combination of prefiltering and reconstruction in the volumetric space is not adequate, aliasing artifacts will appear. Aliasing artifacts project from the three-dimensional space onto the projection plane and superpose to the artifacts caused by sampling and reconstruction in two dimensions. We present a methodology for designing filters based on optimization of combined operation of prefiltering and reconstruction postfiltering. This methodology offers a framework for comparing different reconstruction schemes in equal circumstances. The correct choice of reconstruction will also influence the derivative reconstruction which is used for shading. We demonstrate our results on examples in two- and three-dimensional space.
{"title":"Prefiltering and reconstruction filters in the volume rendering","authors":"A. Goluban, I. Mihajlovic, L. Budin","doi":"10.1109/MELCON.2000.879994","DOIUrl":"https://doi.org/10.1109/MELCON.2000.879994","url":null,"abstract":"This paper deals with reconstruction filters and appropriate prefiltering techniques in the volume rendering. Sampling, resampling and reconstruction of continuous functions are used in many different fields. To satisfy conditions of Shannon's theorem, prefiltering of images or data volumes is usually required before sampling. The usual approach is to use a Gaussian prefilter, where the cutoff frequency is determined by the sampling rate, and one of the different reconstruction schemes is then applied. The problem is to determine a prefilter so that the reconstruction will reproduce the original object as accurately as possible. If the combination of prefiltering and reconstruction in the volumetric space is not adequate, aliasing artifacts will appear. Aliasing artifacts project from the three-dimensional space onto the projection plane and superpose to the artifacts caused by sampling and reconstruction in two dimensions. We present a methodology for designing filters based on optimization of combined operation of prefiltering and reconstruction postfiltering. This methodology offers a framework for comparing different reconstruction schemes in equal circumstances. The correct choice of reconstruction will also influence the derivative reconstruction which is used for shading. We demonstrate our results on examples in two- and three-dimensional space.","PeriodicalId":151424,"journal":{"name":"2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127498453","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 : 2000-05-29DOI: 10.1109/MELCON.2000.879745
G. Korres, G. Contaxis, P. Katsikas
This paper presents a method for detailed representation of substations in power system state estimation. The conventional weighted least squares state estimator is extended by incorporating the active and reactive power flows of circuit breakers as state variables. Power system observability and state estimates are determined based on a reduced model. The method is illustrated with a 12 bus system.
{"title":"Detailed representation of substations in power system state estimation","authors":"G. Korres, G. Contaxis, P. Katsikas","doi":"10.1109/MELCON.2000.879745","DOIUrl":"https://doi.org/10.1109/MELCON.2000.879745","url":null,"abstract":"This paper presents a method for detailed representation of substations in power system state estimation. The conventional weighted least squares state estimator is extended by incorporating the active and reactive power flows of circuit breakers as state variables. Power system observability and state estimates are determined based on a reduced model. The method is illustrated with a 12 bus system.","PeriodicalId":151424,"journal":{"name":"2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)","volume":"SE-1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126570292","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 : 2000-05-29DOI: 10.1109/MELCON.2000.879727
S. Kalogirou, Christos Papamarcou
A thermosyphon solar water heater consisting of two flat plate collectors of total aperture area of 2.7 m/sup 2/ and 150-lt storage tank is modelled using TRNSYS. Simple experiments were conducted in order to validate the model. During the experiments, the weather conditions were measured every 10 minutes and integrated over an hour. The temperature of the water in the storage tank is also measured at the beginning and end of the day. The storage tank temperature rise was used to validate the model by using the actual weather data as input to the program. Validation tests were performed for 25 days spread over 6 months and the mean deviation between the predicted and the actual values of water temperature rise is 4.7% which is very satisfactory.
{"title":"Simple validation method of a TRNSYS model for a thermosyphon solar water heating system","authors":"S. Kalogirou, Christos Papamarcou","doi":"10.1109/MELCON.2000.879727","DOIUrl":"https://doi.org/10.1109/MELCON.2000.879727","url":null,"abstract":"A thermosyphon solar water heater consisting of two flat plate collectors of total aperture area of 2.7 m/sup 2/ and 150-lt storage tank is modelled using TRNSYS. Simple experiments were conducted in order to validate the model. During the experiments, the weather conditions were measured every 10 minutes and integrated over an hour. The temperature of the water in the storage tank is also measured at the beginning and end of the day. The storage tank temperature rise was used to validate the model by using the actual weather data as input to the program. Validation tests were performed for 25 days spread over 6 months and the mean deviation between the predicted and the actual values of water temperature rise is 4.7% which is very satisfactory.","PeriodicalId":151424,"journal":{"name":"2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121837470","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 : 2000-05-29DOI: 10.1109/MELCON.2000.879709
A. Poullikkas
An important aspect of nuclear energy is safety. One of the most severe accidents in nuclear power generation is the loss of coolant, where the recirculating coolant of the pressurized water reactor may flash into steam. Under such two-phase flow conditions, the reactor cooling pumps become unable to generate the same head as that of the single-phase flow case. In this work, high-speed video (HSV) observations were conducted on a nuclear reactor cooling pump. The HSV identified the bubbles motion into the impeller passages and assisted in the development of a mathematical model based on the control volume method for rotating machines.
{"title":"Effects of entrained air on the performance of nuclear reactor cooling pumps","authors":"A. Poullikkas","doi":"10.1109/MELCON.2000.879709","DOIUrl":"https://doi.org/10.1109/MELCON.2000.879709","url":null,"abstract":"An important aspect of nuclear energy is safety. One of the most severe accidents in nuclear power generation is the loss of coolant, where the recirculating coolant of the pressurized water reactor may flash into steam. Under such two-phase flow conditions, the reactor cooling pumps become unable to generate the same head as that of the single-phase flow case. In this work, high-speed video (HSV) observations were conducted on a nuclear reactor cooling pump. The HSV identified the bubbles motion into the impeller passages and assisted in the development of a mathematical model based on the control volume method for rotating machines.","PeriodicalId":151424,"journal":{"name":"2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)","volume":"121 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123275444","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 : 2000-05-29DOI: 10.1109/MELCON.2000.880371
M. Ruiz-García, C. Tellez-Labao, J. Jerez, J.E. Burgos-Lati, A. Diaz Estrella
This paper deals with the study of the mechanism of medium access in the reverse link within a third generation UTRA system. The voice service is beamed off through a dedicated channel whereas a common channel is used for a very widespread service like Web traffic. The results reveal that there are great differences between the voice only system and the data only system. We can conclude that the maximum number of users within the system will depend only on the required quality of service in the case of the voice system (admission control), but in the case of the data system it depends on the available resources in the access channel.
{"title":"Performance of common channel access in UTRA","authors":"M. Ruiz-García, C. Tellez-Labao, J. Jerez, J.E. Burgos-Lati, A. Diaz Estrella","doi":"10.1109/MELCON.2000.880371","DOIUrl":"https://doi.org/10.1109/MELCON.2000.880371","url":null,"abstract":"This paper deals with the study of the mechanism of medium access in the reverse link within a third generation UTRA system. The voice service is beamed off through a dedicated channel whereas a common channel is used for a very widespread service like Web traffic. The results reveal that there are great differences between the voice only system and the data only system. We can conclude that the maximum number of users within the system will depend only on the required quality of service in the case of the voice system (admission control), but in the case of the data system it depends on the available resources in the access channel.","PeriodicalId":151424,"journal":{"name":"2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)","volume":"118 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131591377","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 : 2000-05-29DOI: 10.1109/MELCON.2000.879736
F. Karagiannis
The work presented in this paper concerns the application of a computer model for the economical assessment of investments in the wind energy field, in order that the PUBLIC POWER CORPORATION of Greece can evaluate the potential private investments, during the negotiations for the Power Purchase Agreement. All technical and economic elements of the investment are taken into account, as well as the Greek legislation (affecting available grants, tariffs, grid conditions, etc.). The model calculates the cash flows of the entire investment and of the equity and some basic indices for the economic assessment such as the net present value, the internal rate of return, the discounted payback period and the benefit-to-cost ratio of the cash flows above.
{"title":"Wind energy investments in Greece-an economical approach","authors":"F. Karagiannis","doi":"10.1109/MELCON.2000.879736","DOIUrl":"https://doi.org/10.1109/MELCON.2000.879736","url":null,"abstract":"The work presented in this paper concerns the application of a computer model for the economical assessment of investments in the wind energy field, in order that the PUBLIC POWER CORPORATION of Greece can evaluate the potential private investments, during the negotiations for the Power Purchase Agreement. All technical and economic elements of the investment are taken into account, as well as the Greek legislation (affecting available grants, tariffs, grid conditions, etc.). The model calculates the cash flows of the entire investment and of the equity and some basic indices for the economic assessment such as the net present value, the internal rate of return, the discounted payback period and the benefit-to-cost ratio of the cash flows above.","PeriodicalId":151424,"journal":{"name":"2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126497551","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 : 2000-05-29DOI: 10.1109/MELCON.2000.879976
P. Kostic, B. Reljin, I. Milosavljevic, S. Ćirković, I. Reljin, I. Rakocevic
The computer tool named CAMIA (Computer-Aided Medical Image Analyzer) for quantitative and qualitative analysis of different medical images is described The system CAMIA can handle different standard image formats such as: BMP, GIF, RAW, JPEG, Biorad PIC, and DICOM. After preprocessing steps the main procedure applied in the system CAMIA is segmentation which is based on the watershed algorithm; the simplified mathematical model of the human visual system. In this way very good subjective quality of the primary segmented image is obtained. By using the interactive semiautomatic method of region growing and selection the medical doctor is able to select easily and extract objects of interest for further diagnosis. This procedure permits high reproducibility of results and robustness in object area determination as prerequisites for precise and objective quantification of detected objects. The embedded modules for statistical and quantitative analysis of objects enables the application of CAMIA in diagnostic practices such as cytology, patho-hystology, radiology (MR, CT, etc.). The system is derived and tested in cooperation with doctor-specialists in the Military Medical Academy in Belgrade.
介绍了用于对不同医学图像进行定量和定性分析的计算机辅助医学图像分析仪CAMIA (computer - aided Medical Image Analyzer)， CAMIA系统可以处理BMP、GIF、RAW、JPEG、Biorad PIC和DICOM等不同的标准图像格式。经过预处理步骤后，CAMIA系统应用的主要步骤是基于分水岭算法的分割;人类视觉系统的简化数学模型。这样可以获得很好的主分割图像的主观质量。采用交互式半自动区域生长和选择方法，医生可以方便地选择和提取感兴趣的对象进行进一步诊断。该程序允许结果的高再现性和目标区域确定的稳健性，作为精确和客观定量检测对象的先决条件。用于对象统计和定量分析的嵌入式模块使CAMIA在细胞学，病理生理学，放射学(MR, CT等)等诊断实践中的应用成为可能。该系统是与贝尔格莱德军事医学院的医生专家合作开发和测试的。
{"title":"CAMIA-Computer-Aided Medical Images Analyzer","authors":"P. Kostic, B. Reljin, I. Milosavljevic, S. Ćirković, I. Reljin, I. Rakocevic","doi":"10.1109/MELCON.2000.879976","DOIUrl":"https://doi.org/10.1109/MELCON.2000.879976","url":null,"abstract":"The computer tool named CAMIA (Computer-Aided Medical Image Analyzer) for quantitative and qualitative analysis of different medical images is described The system CAMIA can handle different standard image formats such as: BMP, GIF, RAW, JPEG, Biorad PIC, and DICOM. After preprocessing steps the main procedure applied in the system CAMIA is segmentation which is based on the watershed algorithm; the simplified mathematical model of the human visual system. In this way very good subjective quality of the primary segmented image is obtained. By using the interactive semiautomatic method of region growing and selection the medical doctor is able to select easily and extract objects of interest for further diagnosis. This procedure permits high reproducibility of results and robustness in object area determination as prerequisites for precise and objective quantification of detected objects. The embedded modules for statistical and quantitative analysis of objects enables the application of CAMIA in diagnostic practices such as cytology, patho-hystology, radiology (MR, CT, etc.). The system is derived and tested in cooperation with doctor-specialists in the Military Medical Academy in Belgrade.","PeriodicalId":151424,"journal":{"name":"2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131726814","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 : 2000-05-29DOI: 10.1109/MELCON.2000.880434
L. Stoimenov, S. Djordjevic-Kajan, D. Stojanović
This paper presents the ORHIDEA project, which provides intelligent integration of information using mediation technology. ORHIDEA (an Internet-based version of GinisNT) is used for the integration of spatial data from geographic information system (GIS) databases with alphanumerical data from relational database management systems (RDBMSs) and other data sources.
本文提出了ORHIDEA项目，该项目利用中介技术提供信息的智能集成。ORHIDEA (Internet-based version of ginisn)用于整合地理信息系统(GIS)数据库中的空间数据与关系数据库管理系统(rdbms)和其他数据源中的字母数字数据。
{"title":"Integration of GIS data sources over the Internet using mediator and wrapper technology","authors":"L. Stoimenov, S. Djordjevic-Kajan, D. Stojanović","doi":"10.1109/MELCON.2000.880434","DOIUrl":"https://doi.org/10.1109/MELCON.2000.880434","url":null,"abstract":"This paper presents the ORHIDEA project, which provides intelligent integration of information using mediation technology. ORHIDEA (an Internet-based version of GinisNT) is used for the integration of spatial data from geographic information system (GIS) databases with alphanumerical data from relational database management systems (RDBMSs) and other data sources.","PeriodicalId":151424,"journal":{"name":"2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122259288","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 : 2000-05-29DOI: 10.1109/MELCON.2000.879688
S. Trabulus
Each year as line and system loadings increase due to the energy request and more operating companies superimpose higher voltage transmission systems on existing facilities, the ultra high voltage power systems are coming more to the fore. Since the metal oxide surge arresters have an important role in the insulation coordination of the whole power system, in this paper the present development state and the different design criteria of the metal oxide surge arresters are taken into account for the ultra high voltage transmission lines of 1000 kV.
{"title":"Metal oxide surge arrester design for ultra high voltage transmission lines","authors":"S. Trabulus","doi":"10.1109/MELCON.2000.879688","DOIUrl":"https://doi.org/10.1109/MELCON.2000.879688","url":null,"abstract":"Each year as line and system loadings increase due to the energy request and more operating companies superimpose higher voltage transmission systems on existing facilities, the ultra high voltage power systems are coming more to the fore. Since the metal oxide surge arresters have an important role in the insulation coordination of the whole power system, in this paper the present development state and the different design criteria of the metal oxide surge arresters are taken into account for the ultra high voltage transmission lines of 1000 kV.","PeriodicalId":151424,"journal":{"name":"2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)","volume":"25 14","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120856992","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 : 2000-05-29DOI: 10.1109/MELCON.2000.880070
A. Saleeb, V.K. Hanna
The conventional minimum shift keying modulator (RISK) uses analog circuits and suffers from synchronization problems. A modulator is proposed here which is free from timing problems. It contains only 3 analog circuits (compared to 9 for the conventional modulator) and uses digital gates.
{"title":"Simplified minimum shift keying modulator","authors":"A. Saleeb, V.K. Hanna","doi":"10.1109/MELCON.2000.880070","DOIUrl":"https://doi.org/10.1109/MELCON.2000.880070","url":null,"abstract":"The conventional minimum shift keying modulator (RISK) uses analog circuits and suffers from synchronization problems. A modulator is proposed here which is free from timing problems. It contains only 3 analog circuits (compared to 9 for the conventional modulator) and uses digital gates.","PeriodicalId":151424,"journal":{"name":"2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121144255","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}
2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)
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