{"title":"Discrete-time chaotic communication system","authors":"Carmen Grigoras, Victor Grigoras","doi":"10.1109/ISEEE.2017.8170629","DOIUrl":"https://doi.org/10.1109/ISEEE.2017.8170629","url":null,"abstract":"Chaotic modulation is a strong method of improving communication security. Analog and discrete chaotic systems are presented in actual literature. Due to the expanse of digital communication, discrete-time systems become more efficient and closer to actual technology. The present contribution presents a reliable design method for a discrete-time nonlinear emitter, based on an analogue prototype. The corresponding synchronizing receiver is obtained in a similar mode and the modulation-demodulation process is analyzed. The final concluding remarks highlight typical applications and possible further research.","PeriodicalId":276733,"journal":{"name":"2017 5th International Symposium on Electrical and Electronics Engineering (ISEEE)","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121371018","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":"Hardware configuration of DC-DC converter for renewable energies conversion","authors":"S. Epure, C. Vlad, R. Paduraru","doi":"10.1109/ISEEE.2017.8170697","DOIUrl":"https://doi.org/10.1109/ISEEE.2017.8170697","url":null,"abstract":"A DC/DC converter that can be used to charge a lead-acid battery bank from a wide variety of input renewable sources is presented. The motherboard of the converter can be populated in such way that a boost or a SEPIC (Single-Ended Primary-Inductor Converter) structure is obtained. In order to lower the stress on the electronic components, the converter uses four DC/DC stages connected in parallel and driven with interleaved PWM signals. The main advantage resides in the fact that all parameters of the control loops as well as the nominal values for input and output electrical values can be adjusted by the final user. Two converters were built and tested simultaneously inside a low power distributed system, implementing MPPT algorithm. Key aspects of the low level hardware implementation and component dimensioning will be detailed.","PeriodicalId":276733,"journal":{"name":"2017 5th International Symposium on Electrical and Electronics Engineering (ISEEE)","volume":"192 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125854203","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":"Aspects of change detection in vibrational processes based on time-frequency transforms","authors":"D. Aiordachioaie","doi":"10.1109/ISEEE.2017.8170642","DOIUrl":"https://doi.org/10.1109/ISEEE.2017.8170642","url":null,"abstract":"The main goal of the work is to present some aspects in using time-frequency transforms, applied to the vibration signals and for change detection purposes, from signal processing point of view. The processed object is the time-frequency image (TFI), as result of the time-frequency transform. Two distributions are considered: Wigner-Ville and Choi-Williams, each with specific properties and matched to particular structures of the analyzed signals. The detection of the region of interest inside of TFI, and the estimation of relevant parameters of such regions, is considered as a problem of feature extraction and representation. The parameters, as the coordinates of the energy concentration area and the size of the region, are considered in the first stage. At the next stage, extensions of the parameters in the (t, f) plane is considered.","PeriodicalId":276733,"journal":{"name":"2017 5th International Symposium on Electrical and Electronics Engineering (ISEEE)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115250261","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 low complexity solution for epilepsy detection using an improved version of the reaction-diffusion transform","authors":"R. Dogaru, I. Dogaru","doi":"10.1109/ISEEE.2017.8170678","DOIUrl":"https://doi.org/10.1109/ISEEE.2017.8170678","url":null,"abstract":"Recognition of epileptic seizures is an important issue and in certain circumstances it is desirable to have portable equipment implementing the algorithm in order to better monitor the patients. This work considers a widely used EEG database from University of Bonn as reference for comparing our recognition method with other previously reported. In order to perform epileptic seizures we combine a low complexity nonlinear transform applied to the EEG time-series with a fast support vector classifier (FSVC), a low complexity classifier introduced in previous works. Since EEG signals used in epilepsy detection are complex signals produced in a large network of neurons it make sense to extract proper features using an optimized version of a nonlinear transform (previously introduced as the reaction-diffusion transform — RDT) having its roots in our previous work in the field of cellular nonlinear networks. Results reported here confirm that very good performance (98.67% accuracy) can be obtained, while using a very low complexity solution which is easy to integrate in a portable device. Since RDT provided already very good results in recognizing speech commands, there is a good evidence to consider it as an useful preprocessing method for a wider range of signals or time-series to be recognized.","PeriodicalId":276733,"journal":{"name":"2017 5th International Symposium on Electrical and Electronics Engineering (ISEEE)","volume":"221 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115996295","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":"The modeling and simulation of the synchronous generators connection to the power system","authors":"P. Atănăsoae, R. Pentiuc","doi":"10.1109/ISEEE.2017.8170662","DOIUrl":"https://doi.org/10.1109/ISEEE.2017.8170662","url":null,"abstract":"The paper presents modeling and simulation programme of the synchronize conditions for synchronous generator in the thermal power plants. The programme is utilized for educational purposes in the laboratory “Electrical Section of Power Plants” for the conditions study and the practical skill moulding to the thermal power units interconnected. Are studied the synchronize conditions and the admissible deviations for the TH-60-2 turbo-generator of 60 MW which equipping the combined heat and power plants majority of Romania.","PeriodicalId":276733,"journal":{"name":"2017 5th International Symposium on Electrical and Electronics Engineering (ISEEE)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122448317","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":"Visualization and analysis of user behaviour patterns for multimedia content view in social networks","authors":"Amjad Jumaah Frhan","doi":"10.1109/ISEEE.2017.8170685","DOIUrl":"https://doi.org/10.1109/ISEEE.2017.8170685","url":null,"abstract":"Online social networks have become the major source of information and entertainment for millions of users due to the tremendous increase of the accessibility options. Mobile internet has revolutionized the users to access social networking sites with ease and also allows to various social multimedia content anytime, anywhere and on behalf of any identity. This makes the analysis of user interactions and behaviours more complicated. This paper focuses on developing a visualization model named as Social Pattern Clustering WebClickviz (SPC-WebClickviz) for better analysis of the social user behaviour especially the multimedia access. This proposed model visualizes the social networking data based on user activities and then clusters them into specified groups. As the clustering is done for the multimedia content view, the Correlation clustering method has been introduced to group the user activities of multimedia access. Spearman's rank correlation coefficient is utilized as the correlation factor for the clustering. The clustering results are utilized by the organizations to produce the closely related products for the customer's intentions. It also aids in the multimedia developers to provide with content that serializes the users' intentions so that they can generate more traffic to their own websites through the common social networking sites.","PeriodicalId":276733,"journal":{"name":"2017 5th International Symposium on Electrical and Electronics Engineering (ISEEE)","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114036971","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":"Modeling and simulation of DC resonant circuit breakers","authors":"H. Balan, M. Buzdugan, R. Munteanu","doi":"10.1109/ISEEE.2017.8170664","DOIUrl":"https://doi.org/10.1109/ISEEE.2017.8170664","url":null,"abstract":"The specific problems of the disconnection of HVDC breakers need an analysis of performances at laboratory scale. In the study of hybrid circuit breakers with commutation, three steps are necessary: modeling, simulation and experimental tests. The paper presents a modeling procedure for a hybrid commutation breaker intended to operate using resonant circuits phenomenon. Using the Matlab platform, the simulation of the disconnection of short-circuit process, highlights the reduction of the disconnection period at a low value of the short-circuit current. The performance of the electric equipment is analyzed in the laboratory, in terms of the concordance between the model and the simulation procedure.","PeriodicalId":276733,"journal":{"name":"2017 5th International Symposium on Electrical and Electronics Engineering (ISEEE)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129871001","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":"Dedicated software used in monitoring the potentially explosive gases within the underground hydrotechnical works","authors":"Adrian Bogdan Simon, L. Samoilă, S. Arad","doi":"10.1109/ISEEE.2017.8170646","DOIUrl":"https://doi.org/10.1109/ISEEE.2017.8170646","url":null,"abstract":"This work deals with modern trends in the design and development of monitoring and data acquisition systems for potentially explosive gases in underground sites, as well as implementing this kind of a system, with dedicated software, in mine openings made by Hidroconstructia Company in Buzau County.","PeriodicalId":276733,"journal":{"name":"2017 5th International Symposium on Electrical and Electronics Engineering (ISEEE)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123492446","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}
A. Toktas, M. Tekbaş, A. Kayabasi, E. Yiğit, K. Sabanci, M. Yerlikaya
{"title":"A generalized formula in calculation of the resonant frequency of notch antenna","authors":"A. Toktas, M. Tekbaş, A. Kayabasi, E. Yiğit, K. Sabanci, M. Yerlikaya","doi":"10.1109/ISEEE.2017.8170695","DOIUrl":"https://doi.org/10.1109/ISEEE.2017.8170695","url":null,"abstract":"Notch antenna is constructed by slotting an edge of rectangular patch placed on a substrate over ground plane. Analysis of the notch antenna is complicated and very difficult due to having non-uniform shape. In this work, a novel formulation is proposed for calculating the resonant frequency of the notch antennas. The formulation regarding the resonant length of the antenna reflecting the impact of the slot is derived using Particle Swarm Optimization (PSO). Data vector of 96 notch antennas consisting of seven geometrical and electrical parameters is acquired by simulations. A resonant length formula enclosing those parameters accompanying with optimization variables is constituted in conformity with simulation data. The variables are then optimally determined by fitting the calculated resonant frequency to the simulated one by PSO algorithm. The proposed formulation is verified with simulated/measured data and validated with a test notch antenna fabricated in this study. The results demonstrate that the resonant frequency of the notch antenna can be simply calculated using the proposed formulation without dealing with sophisticated mathematics and performing simulations or measurement.","PeriodicalId":276733,"journal":{"name":"2017 5th International Symposium on Electrical and Electronics Engineering (ISEEE)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121427627","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 influence and measurement uncertainty on NdFeB magnetic characteristics","authors":"Marius Daniel Călin, E. Helerea, Gheorghe Anghel","doi":"10.1109/ISEEE.2017.8170699","DOIUrl":"https://doi.org/10.1109/ISEEE.2017.8170699","url":null,"abstract":"Hard magnetic materials require specific technical data as accurate as possible to be used in designing and manufacturing devices with permanent magnets integrated into advanced systems. However, determining the specific permanent magnet characteristics is accompanied by a series of measurement errors that depend on the measurement method (in closed or open magnetic circuit, with continuous or pulsed magnetization), the geometry of the tested samples and their mechanical and thermal manufacturing. Among extrinsic factors of influence, the temperature remains one of the most important measurement error sources. For this reason, all measurement regulations specify the value of the testing temperature. The decrease in measurement uncertainty consists of corrections that are made on the magnetic characteristics (eddy current correction, demagnetization factor correction, etc.). A way to reduce the random errors in experimental determinations is the uses of several identical samples and consecutive measurements on the same sample. The resulting value strings are processed with statistical methods (e.g., Dixon test, Grubbs test, Cochran test, etc.) to eliminate the extreme values and estimate the values with a certain confidence interval. The present paper deals with the obtaining the characteristic parameters and the demagnetization curves for NdFeB type N38 cylindrical samples with the hysteresisgraph method, for the temperature range 25°C-120°C, by performing 10 successive measurements on the same sample for every chosen temperature value. Statistical data processing allows the temperature influence and measurement uncertainty on NdFeB magnetic characteristics to be established, namely the coercivity, the magnetic remanence, the maximum magnetic energy density and the coefficients of variation with the temperature of these parameters.","PeriodicalId":276733,"journal":{"name":"2017 5th International Symposium on Electrical and Electronics Engineering (ISEEE)","volume":"106 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124299079","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}