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Bulletin of the Polytechnic Institute of Iași. Electrical Engineering, Power Engineering, Electronics Section最新文献

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Connecting Analog and Discrete Nonlinear Systems for Noise Generation 连接模拟和离散非线性系统的噪声产生
Bulletin of the Polytechnic Institute of Iași. Electrical Engineering, Power Engineering, Electronics Section Pub Date : 2022-03-01 DOI: 10.2478/bipie-2022-0005
Victor Grigoras, Carmen Grigoras
{"title":"Connecting Analog and Discrete Nonlinear Systems for Noise Generation","authors":"Victor Grigoras, Carmen Grigoras","doi":"10.2478/bipie-2022-0005","DOIUrl":"https://doi.org/10.2478/bipie-2022-0005","url":null,"abstract":"Abstract Nonlinear systems exhibit complex dynamic behaviour, including quasi-periodic and chaotic. The present contribution presents a composed analogue and discrete-time structure, based on second-order nonlinear building blocks with periodic oscillatory behaviour, that can be used for complex signal generation. The chosen feedback connection of the two modules aims at obtaining a more complex nonlinear dynamic behaviour than that of the building blocks. Performing a parameter scan, it is highlighted that the resulting nonlinear system has a quasi-periodic behaviour for large ranges of parameter values. The nonlinear system attractor projections are obtained by simulation and statistical numerical results are presented, both confirming the possible use of the designed system as a noise generator.","PeriodicalId":330949,"journal":{"name":"Bulletin of the Polytechnic Institute of Iași. Electrical Engineering, Power Engineering, Electronics Section","volume":"231 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122773954","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
Distortion Analysis for Programmable Analog Signals Generated Using FPGA 基于FPGA的可编程模拟信号失真分析
Bulletin of the Polytechnic Institute of Iași. Electrical Engineering, Power Engineering, Electronics Section Pub Date : 2022-03-01 DOI: 10.2478/bipie-2022-0003
A. Hariton, C. Zet, C. Fosalau
{"title":"Distortion Analysis for Programmable Analog Signals Generated Using FPGA","authors":"A. Hariton, C. Zet, C. Fosalau","doi":"10.2478/bipie-2022-0003","DOIUrl":"https://doi.org/10.2478/bipie-2022-0003","url":null,"abstract":"Abstract Practical applications in electrical engineering often deal with analog signals, but there are employed also digital circuits and microcontrollers. Sometimes it is easier or cheaper to improvise DA and AD converters instead of using dedicated ones. This paper is a comparative analysis of how accurate the analog signals can be generated from digital systems, like Field Programmable Gate Arrays (FPGAs) using only additional passive circuits. For this analysis, different FPGAs families were tested. Two alternatives of generating analog signals were considered in this study: PWM and R2R network. The analysis has been performed for a common frequency band, from 100 Hz to 30 kHz, using a virtual instrument for building an automated test system. At 10 kHz the PWM module obtains better THD values, reaching even 0.013% and at 30 kHz the R2R module obtains better THD values, reaching even 0.222%.","PeriodicalId":330949,"journal":{"name":"Bulletin of the Polytechnic Institute of Iași. Electrical Engineering, Power Engineering, Electronics Section","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127033960","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
Evolution of the Manufacturing Technology of Photovoltaic Panels and Factors Affecting their Performance 光伏板制造技术的演变及其性能影响因素
Bulletin of the Polytechnic Institute of Iași. Electrical Engineering, Power Engineering, Electronics Section Pub Date : 2021-12-01 DOI: 10.2478/bipie-2021-0024
Marcel Hamda Soulouknga, D. Lucache, S. Y. Doka
{"title":"Evolution of the Manufacturing Technology of Photovoltaic Panels and Factors Affecting their Performance","authors":"Marcel Hamda Soulouknga, D. Lucache, S. Y. Doka","doi":"10.2478/bipie-2021-0024","DOIUrl":"https://doi.org/10.2478/bipie-2021-0024","url":null,"abstract":"Abstract The efficiency of the production of electricity from solar energy depends on technological developments and the performance of the photovoltaic panels. A positive trend depends on diversifying the materials used to manufacture plates and adapting them to the climatic conditions. The article presents several technological aspects to give an idea about the evolution of the yields of photovoltaic panels, especially about the photovoltaic technology in the first, the second, and third generations. After the statement of the main characteristics of the photovoltaic panels, an analysis of the factors that can affect their performances and can create difficulties in implementing projects is made. This approach aims to choose the most advantageous combination of concepts and techniques when making photovoltaic parks.","PeriodicalId":330949,"journal":{"name":"Bulletin of the Polytechnic Institute of Iași. Electrical Engineering, Power Engineering, Electronics Section","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123548261","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
Environmental Performance Evaluation for a Small Scale Trigeneration System 小型三联发电系统的环境性能评价
Bulletin of the Polytechnic Institute of Iași. Electrical Engineering, Power Engineering, Electronics Section Pub Date : 2021-12-01 DOI: 10.2478/bipie-2021-0023
B. Neagu, M. Gavrilas, M. Tirsu, Nicolae Covalenco, Ion Negura
{"title":"Environmental Performance Evaluation for a Small Scale Trigeneration System","authors":"B. Neagu, M. Gavrilas, M. Tirsu, Nicolae Covalenco, Ion Negura","doi":"10.2478/bipie-2021-0023","DOIUrl":"https://doi.org/10.2478/bipie-2021-0023","url":null,"abstract":"Abstract The modern buildings must have very high standards and require highly efficient energy supply systems due to space limitations for renewable installations. Electricity and thermal energy can be produced simultaneously with a photovoltaic-thermal (PVT) system. In the paper, an innovative concept of PVT system for a hospital is studied. PVT collectors serve as both a heat source and a heat sink for a reversible heat pump in the examined system. Due to the reduced electricity consumption from the network for heat rejection, the overall efficiency was improved by using a reversible water-to-water heat pump as heat and cold source compared to a conventional solar cooling system. Primary energy savings can be achieved with a maximum utilization of PV for electricity, heating and cooling (as air conditioning). The paper presents an original methodology for determining the environmental impact of the real PVT operation. The case study shows that for a real 4kWp PVT, the yearly energy savings reduce the greenhouse gas (GHG) emissions with 281.8 kg/year for SO2 and 152.4 for CO2.","PeriodicalId":330949,"journal":{"name":"Bulletin of the Polytechnic Institute of Iași. Electrical Engineering, Power Engineering, Electronics Section","volume":"272 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115597496","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
GDPR Records of Processing Activities for Data Controllers GDPR数据控制者处理活动记录
Bulletin of the Polytechnic Institute of Iași. Electrical Engineering, Power Engineering, Electronics Section Pub Date : 2021-12-01 DOI: 10.2478/bipie-2021-0019
Cătălin Mironeanu, Cristian Aflori
{"title":"GDPR Records of Processing Activities for Data Controllers","authors":"Cătălin Mironeanu, Cristian Aflori","doi":"10.2478/bipie-2021-0019","DOIUrl":"https://doi.org/10.2478/bipie-2021-0019","url":null,"abstract":"Abstract Data controller organizations are required to keep an up-to-date and detailed list of their processing activities and be prepared to show that list to regulators upon request. This list should include at least the purposes of the processing, the target data and all the parties involved in handling that data. We present a solution for organizing all these information into both relational and non-relational document-oriented databases to facilitate such reports. A technical approach of auditing the implementation degree of the rules introduced by the EU GDPR will better prepare the data controllers in complying to this Regulation. We consider a top-down methodology for processing raw data addressing several types of organizations, with different organizational structures. For all these entities we focus on processes, activities, classes of documents collected and personal data. All these data constitute the basis of the “Records of processing activities” required by the Regulation.","PeriodicalId":330949,"journal":{"name":"Bulletin of the Polytechnic Institute of Iași. Electrical Engineering, Power Engineering, Electronics Section","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125700375","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
Application of Association Rule Mining in Preventing Cyberattacks 关联规则挖掘在网络攻击防范中的应用
Bulletin of the Polytechnic Institute of Iași. Electrical Engineering, Power Engineering, Electronics Section Pub Date : 2021-12-01 DOI: 10.2478/bipie-2021-0020
Cătălin Mironeanu, Alexandru Archip, Georgiana Atomei
{"title":"Application of Association Rule Mining in Preventing Cyberattacks","authors":"Cătălin Mironeanu, Alexandru Archip, Georgiana Atomei","doi":"10.2478/bipie-2021-0020","DOIUrl":"https://doi.org/10.2478/bipie-2021-0020","url":null,"abstract":"Abstract Designing a security solution should rely on having a good knowledge of the protected assets and better develop active responses rather than focus on reactive ones. We argue and prove that malicious activities such as vulnerabilities exploitation and (D)DoS on Web applications can be detected during their respective initial phases. While they may seem distinct, both attack scenarios are observable through abnormal access patterns. Following on this remark, we first analyze Web access logs using association rule mining techniques and identify these malicious traces. This new description of the historical data is then correlated with Web site structure information and mapped over trie data structures. The resulted trie is then used for every new incoming request and we thus identify whether the access pattern is legitimate or not. The results we obtained using this proactive approach show that the potential attacker is denied the required information for orchestrating successful assaults.","PeriodicalId":330949,"journal":{"name":"Bulletin of the Polytechnic Institute of Iași. Electrical Engineering, Power Engineering, Electronics Section","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122558186","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
Transient Residual Voltage Influence on the Dynamic Load Transfer 暂态残余电压对动态负载传递的影响
Bulletin of the Polytechnic Institute of Iași. Electrical Engineering, Power Engineering, Electronics Section Pub Date : 2021-12-01 DOI: 10.2478/bipie-2021-0022
F. Băiceanu, F. Munteanu, C. Nemeş
{"title":"Transient Residual Voltage Influence on the Dynamic Load Transfer","authors":"F. Băiceanu, F. Munteanu, C. Nemeş","doi":"10.2478/bipie-2021-0022","DOIUrl":"https://doi.org/10.2478/bipie-2021-0022","url":null,"abstract":"Abstract The successful operation of back-up supply sources in the case of dynamic loads transfer in industrial electricity supply installation is mainly depending on the mitigation of the residual voltage that appears in fault scenarios that result in losing supply from the main grid. The decrease of the interval of presence of residual bus voltage depends highly on the local load and the network configuration. A high time constant (seconds) of the decreasing residual voltage can lead to the disconnection of critical consumers. In this paper, it is presented a simple, cost-effective method for dynamic load transfer that can replace the Motor Bus Transfer approach. The validity of the method is tested on a real large industrial site from Romania. The case study shows that the proposed approach can achieve a voltage return time of around 750 ms.","PeriodicalId":330949,"journal":{"name":"Bulletin of the Polytechnic Institute of Iași. Electrical Engineering, Power Engineering, Electronics Section","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115494815","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
Generalized Differential Mathematical Model in Stator Reference Frame for PMSM and VRSM Simulation 永磁同步电机和VRSM定子参照系的广义微分数学模型
Bulletin of the Polytechnic Institute of Iași. Electrical Engineering, Power Engineering, Electronics Section Pub Date : 2021-12-01 DOI: 10.2478/bipie-2021-0021
Alexandru-Tudor Popovici, A. Onea
{"title":"Generalized Differential Mathematical Model in Stator Reference Frame for PMSM and VRSM Simulation","authors":"Alexandru-Tudor Popovici, A. Onea","doi":"10.2478/bipie-2021-0021","DOIUrl":"https://doi.org/10.2478/bipie-2021-0021","url":null,"abstract":"Abstract The paper presents the deduction of a novel decoupled form (considering the differential current quantities) of the differential mathematical model in stator reference frame, useful for numeric simulation of control approaches for PMSM (permanent magnet synchronous machines) generalized for both IPMSM and SPMSM (salient and non-salient PMSM). The model is confirmed to be equivalent to the well-known model defined in the rotor synchronous reference frame using a Matlab-Simulink implementation that is verified and validated by simulation during which the power/energy conservation is monitored and the system states’ evolution is compared to the reference model in rotor reference frame using a generator structure.","PeriodicalId":330949,"journal":{"name":"Bulletin of the Polytechnic Institute of Iași. Electrical Engineering, Power Engineering, Electronics Section","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126400028","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: 2
Carbon Offset Calculators 碳补偿计算器
Bulletin of the Polytechnic Institute of Iași. Electrical Engineering, Power Engineering, Electronics Section Pub Date : 2021-09-01 DOI: 10.2478/bipie-2021-0014
M. Popa
{"title":"Carbon Offset Calculators","authors":"M. Popa","doi":"10.2478/bipie-2021-0014","DOIUrl":"https://doi.org/10.2478/bipie-2021-0014","url":null,"abstract":"Abstract The nowadays climate warming trend is of significance because it is related with the human activities starting from the mid-18th century. This climate warming coincides with the increasing of the greenhouse gases concentration in the atmosphere, especially carbon dioxide. Some solutions, like urban agriculture, are aimied to oppose this phenomenon. We are studying a solution to increase the carbon sequestration in urban environments – the rooftop greenhouse buildings - and this work introduces an useful tool for assessing the efficiency of projects of this kind, respectively a fuzzy expert application, made in MATLAB, for real-time estimating the carbon sequestration capacity.","PeriodicalId":330949,"journal":{"name":"Bulletin of the Polytechnic Institute of Iași. Electrical Engineering, Power Engineering, Electronics Section","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133532373","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
Head Gesture Recognition Based on Capacitive Sensors Using Deep Learning Algorithms 基于深度学习算法的电容式传感器头部手势识别
Bulletin of the Polytechnic Institute of Iași. Electrical Engineering, Power Engineering, Electronics Section Pub Date : 2021-09-01 DOI: 10.2478/bipie-2021-0018
Ionut-Cristian Severin, D. Dobrea
{"title":"Head Gesture Recognition Based on Capacitive Sensors Using Deep Learning Algorithms","authors":"Ionut-Cristian Severin, D. Dobrea","doi":"10.2478/bipie-2021-0018","DOIUrl":"https://doi.org/10.2478/bipie-2021-0018","url":null,"abstract":"Abstract The current paper proposed and investigated the head motion recognition idea based on four capacitive sensors and deep learning models. The proposed system was designed to empower a tetraplegic person to control a remote device or an intelligent wheelchair. The capacitive sensors were placed around the neck using a necktie, which each volunteer who participated in this experiment was easy to use. The results show that the best-proposed deep learning model can determine each activity with a classification rate equal to 89.29% using capacitive raw data. During the experiments the deep learning models provided accuracy values in the range of 56.25% to 89.29%.","PeriodicalId":330949,"journal":{"name":"Bulletin of the Polytechnic Institute of Iași. Electrical Engineering, Power Engineering, Electronics Section","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130327711","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
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