2016 International Symposium on Fundamentals of Electrical Engineering (ISFEE)最新文献

{"title":"Electromechanical model and operating modes of high-voltage induction motor electric drive — Part II: Power losses","authors":"S. Rachev, D. Koeva, L. Dimitrov","doi":"10.1109/ISFEE.2016.7803189","DOIUrl":"https://doi.org/10.1109/ISFEE.2016.7803189","url":null,"abstract":"The influence of the power supply in the operating modes of the induction electric drives is effected by the occurrence of voltage deflection in some cases. This is directly related to load of the shaft of an induction motor in driving different production mechanisms and reliable operation of the electric drive as a whole. Paper deals with evaluation of the combined expression of the voltage deflection and the value of the torque of inertia on the power losses in a powerful electric drive for a pump unit. Simulation is performed on high-voltage induction motor using the proposed model.","PeriodicalId":240170,"journal":{"name":"2016 International Symposium on Fundamentals of Electrical Engineering (ISFEE)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126785143","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}

{"title":"Alternative algorithms involving alphabetical coding and limited length encoding in lossless data compression of text files","authors":"R. Radescu","doi":"10.1109/ISFEE.2016.7803154","DOIUrl":"https://doi.org/10.1109/ISFEE.2016.7803154","url":null,"abstract":"Coding algorithms are generally aimed at minimizing the output code length encoding speed once the code has been designed. Moreover, most codes use a binary alphabet. This paper examines other issues related to coding, such as additional constraints imposed on the channel. Code generation will be considered where there is a limit on code words. Limits the application of such systems is a practical example of data compression where fast decoding is essential. When all code words correspond to a single word in memory (usually 32 bits, but there are situations that take 64-bit) can be used canonical decoding. If the deadline cannot be guaranteed, however, required the use of slower decoding methods. This paper also deals with the alphabetic code generation, where lexicographic arrangement of words by their code symbols must correspond to the original order in which the symbols were taken coding system. When an alphabetic code is used to compress a database that can be sorted in the same, order they would have had if the database records were first decompressed and then sorted. It also corresponds to alphabetic code trees binary search trees, which have applications in a wide variety of search problems. Assumption that the symbols are sorted by probability is not suitable for this scenario. The problem of finding codes for non-binary alphabets channel will be examined in detail. The subsequent experimental results cover the problem of alphabetic coding and of limited length coding.","PeriodicalId":240170,"journal":{"name":"2016 International Symposium on Fundamentals of Electrical Engineering (ISFEE)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125743029","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}

{"title":"Using the Wavelet Packet Transform to evaluate harmonics through a lookup table technique","authors":"I. Nicolae, P. Nicolae","doi":"10.1109/ISFEE.2016.7803205","DOIUrl":"https://doi.org/10.1109/ISFEE.2016.7803205","url":null,"abstract":"The paper is concerned with an intuitive approach of harmonics evaluation by using the Wavelet Packet Transform. Conceptual argumentation of simple and reliable algorithms is provided firstly. Two wavelet mothers (WM) were analyzed in order to see which of them allows for a simpler and faster implementation, involving less computer resources simultaneously with improved accuracy. The first one (using a Daubechy WM relying on 28 coefficients - known as db14 in Matlab) involves smaller runtimes for decomposition, but the per/node weights of “node-dominant” harmonics have often smaller values when compared to those yielded by db20. For both analyzed WM, 8 nodes from the final level could be grouped in pairs considering the principle: energies of nodes in a group are affected only by a pair of harmonics and the paired corresponding harmonics do not affect any other node except those from that group. The weights of energies generated by signals polluted by a single harmonic were found to be almost identical for a certain node, irrespective to the magnitude or phase of the analyzed signals. On the other hand, when pairs of harmonics (correlated by the nodes where their energies can be found) act simultaneously, variations of the above mentioned weights were recorded. Therefore a harmonic evaluation based on the solving of 2×2 linear systems yields errors and sometimes negative energies leading to values for harmonic magnitudes out of the real numbers' space. In this context we conceived and implemented another algorithm, based on a lookup table technique. For the “non-paired” harmonics another rule was detected. Groups of 4 nodes (quadruples) are affected only by groups of at most 4 harmonics. Three quadruples were found. For one of them only the energies of 3 nodes a required, because only 3 harmonics influence the nodes from the quadruple. Good mean values of errors related to the harmonic magnitudes evaluation were obtained after running sets of 50 randomly polluted signals for all pairs of odd harmonic orders from the range 3...40. Most of the absolute percent errors higher then 1.5% from the RMS value of the polluted signal in the case when the lookup table technique was used were found to be associated to inversions in paired harmonics (that is the magnitudes of harmonics were computed as being switched between the members in a harmonic pair). This is due to the symmetry of some components of the matrices used for calculation and perhaps can be solved by using more accurate values for them.","PeriodicalId":240170,"journal":{"name":"2016 International Symposium on Fundamentals of Electrical Engineering (ISFEE)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133486063","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}

{"title":"A survey of multiport converters used in renewable energy","authors":"S. Al-Chlaihawi, Ammar Ghalib Al-Gizi","doi":"10.1109/ISFEE.2016.7803185","DOIUrl":"https://doi.org/10.1109/ISFEE.2016.7803185","url":null,"abstract":"Multiport converters are a promising concept for use in renewable-energy and hybrid power sources. These converters are highly beneficial, as conversion can be carried out in a single stage even while interfaced with multiple input power sources (hybrid). This paper provides an introduction to multiport converters and a comparison with conventional converters. The application of multiport converters with reference to renewable-energy sources along with the advantages and disadvantages of both types of converters are analyzed.","PeriodicalId":240170,"journal":{"name":"2016 International Symposium on Fundamentals of Electrical Engineering (ISFEE)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133494042","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}

{"title":"Teeth labeling from CBCT data using the Circular Hough Transform","authors":"I. Pavaloiu, A. Vasilățeanu, N. Goga, Iuliana Marin, Andrei Ungar, I. Pătrașcu","doi":"10.1109/ISFEE.2016.7803179","DOIUrl":"https://doi.org/10.1109/ISFEE.2016.7803179","url":null,"abstract":"In this paper, we explore the possibilities to detect and label straightforward the teeth in Cone Beam Computed Tomography images, without performing complex segmentation procedures on teeth. We are using the Circular Hough Transform (CHT) to find the teeth positions, segmentation using intensity level to determine the mandible and deformable templates to find the best fit position for the teeth on the mandible. The dental arch is split into 16 regions and the teeth are labeled by their position in a given region.","PeriodicalId":240170,"journal":{"name":"2016 International Symposium on Fundamentals of Electrical Engineering (ISFEE)","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133484513","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}

{"title":"Geoelectric Tomography and Electrical Methods, with Applicability in the Strategy for Identifying Contaminated Area","authors":"M. Moraru, A. Tanasie","doi":"10.1109/ISFEE.2016.7803159","DOIUrl":"https://doi.org/10.1109/ISFEE.2016.7803159","url":null,"abstract":"In this article, we would like discribing the technique underlying the investigations through computed geoelectric tomography done using the resistivity method. The method is designed to reveal information about those formations or bodies which display anormalies of the electrical conductivity and also has long been used to diferentiate the layers that have different levels of conductivity. Apparently these resistivities are usually functions of some variables which are in accordance with the depth of the investigation. The geological surveillance utilizes a wide variety of techniques, each based on different properties or characteristics of the soil. It is accoustomed for most electrical methods to define a function called the apparent resistivity response [ρa], which can be assessed and estimated from measurements. The giding principle of the method - The data collection is made uniformly throughout the profile,the density being determined by the distance between the electrodes and the type of the chosen device. Through one single stretch of the cable we can perform hundreds of multi-electrode measurements of resistivity, and thereby creating a 2D image of the sub-soil similar to a tomography. The data is then filtered and processed using a specialized software, which, unlike the Vertical Electric Survey method (SEV), performs a 2D inversion of all sections according to the lateral variations of the resistivities'-distribution throughout the length of the profile.","PeriodicalId":240170,"journal":{"name":"2016 International Symposium on Fundamentals of Electrical Engineering (ISFEE)","volume":"328 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133675776","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}

{"title":"Bologna process not (yet?) a success for electric and electronic engineering at UPT","authors":"C. Blaj, D. Toader","doi":"10.1109/ISFEE.2016.7803239","DOIUrl":"https://doi.org/10.1109/ISFEE.2016.7803239","url":null,"abstract":"Ten years after signing the agreements and applying the reorganization of university studies, in accordance with the Bologna declaration and the Prague 2001, Berlin 2003 ministerial meetings, we say that, in our university, this is not a success. The “yet” word in our title keeps a trace of hope for the future. We try to explain what we do and what we think about current results, in the context of Bologna process. The considerations in this paper do not, necessarily, express the official point of view of Universitatea Politehnica Timisoara.","PeriodicalId":240170,"journal":{"name":"2016 International Symposium on Fundamentals of Electrical Engineering (ISFEE)","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131381198","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}

{"title":"Coupled electrical-thermal model for monopolar and bipolar radiofrequency liver tumor ablation","authors":"Frederik Soetaert, G. Crevecoeur, L. Dupré","doi":"10.1109/ISFEE.2016.7803150","DOIUrl":"https://doi.org/10.1109/ISFEE.2016.7803150","url":null,"abstract":"Radiofrequency ablation (RFA) is an alternative cancer treatment that applies radiofrequency electric fields to biological tissues. The subsequent electrical currents induce Joule heating and inflict local thermal damage to the biological tissue. Previous clinical studies demonstrate the possibilities and benefits of applying RFA for the treatment of liver tumors. Currently, most clinical studies focus on monopolar RFA, consisting of a single electrode and a grounding pad, and its therapeutical outcome. This study however focuses on a bipolar configuration where two needle electrodes are inserted at a certain potential difference. In order to assess the temperature elevations in biological tissues, we have developed a computational model. A mathematical model based on Laplace's equation (with appropriate boundary conditions) is used to model the electromagnetic phenomena and is coupled to the bioheat transfer equation. This study compares a monopolar RFA with a bipolar configuration. We investigate the spatio-temporal temperature variations using detailed numerical three-dimensional finite element simulations in biological tissues, corresponding to liver tissue. Results show that the ablated region in between the two needles of the bipolar configuration can be enlarged compared to a monopolar RFA configuration.","PeriodicalId":240170,"journal":{"name":"2016 International Symposium on Fundamentals of Electrical Engineering (ISFEE)","volume":"220 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115492055","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}

{"title":"Application of harmonic radar on the research of bees' behavior","authors":"Zuo‐Min Tsai, F. Chang, Kun-You Lin, En-Cheng Yang, Feng-Li Lian, Huei Wang","doi":"10.1109/ISFEE.2016.7803220","DOIUrl":"https://doi.org/10.1109/ISFEE.2016.7803220","url":null,"abstract":"This paper presents the recently research of the harmonic radar at National Taiwan University and National Chung Cheng University. The topic includes the radar base, portable radar, and the transponder. In the radar base, high sensitivity radar using the correlation of PRN code is developed. To isolate the transmitter and the receiver, a cancellation technique of the local leakage signal is investigated. In the portable radar, an analog correlator network is designed so that the high speed oscilloscope can be replaced by the portable monitor. This portable radar can search a transponder at a distance of 1 m. The transponder design needs to minimize the loss of bee's body, and both ground plane shieling and the virtual ground plane are used to reduce the loss of the body. The reduction of the influence by the bee's body for the transponder using either method is 3-4 dB.","PeriodicalId":240170,"journal":{"name":"2016 International Symposium on Fundamentals of Electrical Engineering (ISFEE)","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117149273","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}

{"title":"Temperature control and monitoring system for power transformer windings using fiber optic sensors","authors":"I. Hurezeanu, C. Nicola, D. Sacerdoțianu, M. Nicola, A. Aciu, M. Niţu","doi":"10.1109/ISFEE.2016.7803151","DOIUrl":"https://doi.org/10.1109/ISFEE.2016.7803151","url":null,"abstract":"On-line monitoring of function and condition parameters and the efficiency of the cooling system are key elements in determining the working condition of transformers. This paper presents the implemented hardware and software solutions for carrying out the winding temperature on-line monitoring system using fiber optic sensors. The actual winding temperature is a measurand which defines the condition, load capacity and operating life of transformers. By carrying out the temperature control and monitoring system for power transformer windings using fiber optic sensors, ICMET Craiova aligned itself to the requirements of the international standards.","PeriodicalId":240170,"journal":{"name":"2016 International Symposium on Fundamentals of Electrical Engineering (ISFEE)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121758128","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}