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Serbian Journal of Electrical Engineering最新文献

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The spatial separation of signals by the curvature of the wave front 利用波前曲率对信号进行空间分离
Serbian Journal of Electrical Engineering Pub Date : 2019-01-01 DOI: 10.2298/SJEE1902211O
A. Okorochkov, Bogdan B. Malyutin
{"title":"The spatial separation of signals by the curvature of the wave front","authors":"A. Okorochkov, Bogdan B. Malyutin","doi":"10.2298/SJEE1902211O","DOIUrl":"https://doi.org/10.2298/SJEE1902211O","url":null,"abstract":"In this paper, a new method of spatial separation of several signals with different curvatures of the wave front is proposed. The method is based on the formation of a particular interference field structure of each signal in the location of the receiving antennas by means of a transmitting phased sparse linear array antenna. The peculiarity of the interference electromagnetic field consists in periodically repeating areas in which the amplitude of the useful signal is many times greater than the amplitudes of the other transmitted signals, which are electromagnetic interference. In addition, the electromagnetic interference signal in this area consists of practically two antiphase components. If in this area a reflective passive phased antenna array is placed, which will focus the useful signal while reflecting, it will be increased, and the interference signal will be significantly weakened. This method of signal separation allows simultaneous transmission of several signals in the same frequency band, in one direction and on one polarization, which increases the information transmission speed in communication systems.","PeriodicalId":37704,"journal":{"name":"Serbian Journal of Electrical Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68752714","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
An effective approach to TV applications development - application framework 一种有效的电视应用程序开发方法——应用程序框架
Serbian Journal of Electrical Engineering Pub Date : 2019-01-01 DOI: 10.2298/SJEE1902267K
Nemanja Kovacev, V. Ilkic, Dejan Nadj, N. Vranic
{"title":"An effective approach to TV applications development - application framework","authors":"Nemanja Kovacev, V. Ilkic, Dejan Nadj, N. Vranic","doi":"10.2298/SJEE1902267K","DOIUrl":"https://doi.org/10.2298/SJEE1902267K","url":null,"abstract":"Android as an operating system is becoming more and more widespread across digital devices. One of the fields in which Android has gained popularity is TV application development. During our years-long work on this platform, we noticed certain issues with current approaches. The most important issues include a lot of boilerplate code and difficult customization which together increase the overall time necessary for the development and contribute to poor code readability thus making the maintenance more difficult. With that in mind, we decided to take our own approach which includes a framework and a library and which enables us to build high-quality and cost-effective TV applications in terms of fast development and easy maintenance. The approach which will be presented in this paper is more effective than other approaches we took for the development of previous TV applications.","PeriodicalId":37704,"journal":{"name":"Serbian Journal of Electrical Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68752879","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 impact of quality of service parameters to the subjective and objective video quality assessment 服务质量参数对主客观视频质量评价的影响
Serbian Journal of Electrical Engineering Pub Date : 2018-02-01 DOI: 10.2298/SJEE1801097S
Boban P. Bondzulic, V. Petrovic, D. Stanojevic, B. Pavlović
{"title":"The impact of quality of service parameters to the subjective and objective video quality assessment","authors":"Boban P. Bondzulic, V. Petrovic, D. Stanojevic, B. Pavlović","doi":"10.2298/SJEE1801097S","DOIUrl":"https://doi.org/10.2298/SJEE1801097S","url":null,"abstract":"This paper deals with the delay, delay variation – jitter, packet loss rate and bandwidth as quality of service parameters, in the form of four types of video quality degradations. The impact of defined levels of degradation on subjective impressions (given as mean opinion scores) is analyzed. ReTRiEVED video dataset with publicly available subjective scores is used in the analysis. Three full-reference measures are used for objective assessment of video quality. The degree of consistency of subjective and objective quality scores is shown through scatter plots and quantitative measures (linear correlation coefficient and correlation of the ranks). Based on the interpolation functions, quality of service parameters are mapped to subjective experience. We show that jitter is a much more destructive effect than other degradation types.","PeriodicalId":37704,"journal":{"name":"Serbian Journal of Electrical Engineering","volume":"15 1","pages":"97-114"},"PeriodicalIF":0.0,"publicationDate":"2018-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46893768","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
Prototype implementation of segment assembling software 分段装配软件的原型实现
Serbian Journal of Electrical Engineering Pub Date : 2018-01-01 DOI: 10.2298/SJEE1801071P
Djordje Pesic, M. Mišić, J. Protić, V. Milena
{"title":"Prototype implementation of segment assembling software","authors":"Djordje Pesic, M. Mišić, J. Protić, V. Milena","doi":"10.2298/SJEE1801071P","DOIUrl":"https://doi.org/10.2298/SJEE1801071P","url":null,"abstract":"IT education is very important and a lot of effort is put into the development of tools for helping students to acquire programming knowledge and for helping teachers in automating the examination process. This paper describes a prototype of the program segment assembling software used in the context of making tests in the field of algorithmic complexity. The proposed new program segment assembling model uses rules and templates. A template is a simple program segment. A rule defines combining method and data dependencies if they exist. One example of program segment assembling by the proposed system is given. Graphical user interface is also described.","PeriodicalId":37704,"journal":{"name":"Serbian Journal of Electrical Engineering","volume":"15 1","pages":"71-83"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68751215","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
Resonance shifting by ferrite thick film superstrate 铁氧体厚膜层的共振移位
Serbian Journal of Electrical Engineering Pub Date : 2018-01-01 DOI: 10.2298/SJEE1803275R
M. K. Rendale, S. Mathad, V. Puri
{"title":"Resonance shifting by ferrite thick film superstrate","authors":"M. K. Rendale, S. Mathad, V. Puri","doi":"10.2298/SJEE1803275R","DOIUrl":"https://doi.org/10.2298/SJEE1803275R","url":null,"abstract":"Fritless thick films of Ni-Co-Zn ferrites were fabricated by screen printing technique on alumina substrates. Structural analysis was undertaken using X-ray diffraction and Scanning electron microscopy techniques. A new approach for the determination of complex permittivity (   and   ) using microwave property perturbation is unveiled. Ag thick film microstrip ring resonator (MSRR) with and without the thick film substrate was used for the microwave transmission studies in the frequency region of 812 GHz. The microwave conductivity of the thick films lies in the range of 1.779 S/cm to 2.296 S/cm. The penetration depth is also reported within the X-band of microwave frequencies.","PeriodicalId":37704,"journal":{"name":"Serbian Journal of Electrical Engineering","volume":"15 1","pages":"275-284"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68752157","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
The potential for the use of EEG data in electronic assessments 在电子评估中使用脑电图数据的潜力
Serbian Journal of Electrical Engineering Pub Date : 2018-01-01 DOI: 10.2298/SJEE1803339A
Milos Antonijevic, G. Shimic, A. Jevremović, M. Veinovic, Sladjana Arsic
{"title":"The potential for the use of EEG data in electronic assessments","authors":"Milos Antonijevic, G. Shimic, A. Jevremović, M. Veinovic, Sladjana Arsic","doi":"10.2298/SJEE1803339A","DOIUrl":"https://doi.org/10.2298/SJEE1803339A","url":null,"abstract":": One of the most important goals of electronic assessments is to achieve the smallest measurement error with tests that are as simple and short as possible. The psychological state of an examinee is typically ignored, both in the process of designing the tests and during the exam itself. Using the developed framework, we tested 35 participants in an experiment to obtain as much data as possible about the emotional states of the students depending on the different types of question posed. In this paper, we present our current results from an examination of the potential of using EEG data towards applying artificial intelligence for improvement of electronic assessments, as well as a technical platform for this purpose.","PeriodicalId":37704,"journal":{"name":"Serbian Journal of Electrical Engineering","volume":"10 1","pages":"339-351"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68752518","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
Design of low-temperature DDOAs on the elements of BiJFet array chip MH2XA030 基于BiJFet阵列芯片MH2XA030的低温ddoa设计
Serbian Journal of Electrical Engineering Pub Date : 2018-01-01 DOI: 10.2298/SJEE1802233D
V. Dvornikov, А. V. Tchekhovski, L. V. Dziatlau, N. N. Prokopenko, V. N. Butyrlagin
{"title":"Design of low-temperature DDOAs on the elements of BiJFet array chip MH2XA030","authors":"V. Dvornikov, А. V. Tchekhovski, L. V. Dziatlau, N. N. Prokopenko, V. N. Butyrlagin","doi":"10.2298/SJEE1802233D","DOIUrl":"https://doi.org/10.2298/SJEE1802233D","url":null,"abstract":"Brief information about the new BiJFet array chip (AC) MH2XA030 intended for accelerated creation of analog integrated circuits (IC), which retain their performance under the influence of penetrating radiation and extremely low temperatures (up to minus 197 °С) is presented. The features of schematic design of two types of DDOAs (OAmp3, OAmp4) are considered. The recommendations on the schematic design of the DDOA are developed taking into account the static characteristics of the field effect and bipolar transistors of the AC under the influence of low temperatures. The amplitude-frequency response of the DDOA and the dependence of the noise voltage on the frequency of Fourier density are given. At a temperature of –197°С cryogenic amplifiers OAmp3 (OAmp4) are characterized by the following parameters: the current consumption is less than 500 μA, the input current is less than 1 fA, the voltage gain is more than 50.000 (200.000), the offset voltage is less than 200 (60) μV. The results of the circuit simulation of the instrumentation amplifier based on DDOA OAmp3 are presented.","PeriodicalId":37704,"journal":{"name":"Serbian Journal of Electrical Engineering","volume":"15 1","pages":"233-247"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68751627","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: 8
Reducing of noise structure influence on an accuracy of a desired signal extraction 降低噪声结构对期望信号提取精度的影响
Serbian Journal of Electrical Engineering Pub Date : 2018-01-01 DOI: 10.2298/SJEE1803365M
V. Marchuk
{"title":"Reducing of noise structure influence on an accuracy of a desired signal extraction","authors":"V. Marchuk","doi":"10.2298/SJEE1803365M","DOIUrl":"https://doi.org/10.2298/SJEE1803365M","url":null,"abstract":"In the paper, the issues regarding the analysis of the noise component structure are addressed and methods for reducing the error in estimating of the mathematical expectation of the noise component are proposed. The use of the proposed method of “noise purification” makes possibility to reduce the error introduced by the noise structure when estimating the mathematical expectation and dispersion of the noise component during research. The main scientific contribution in this paper in accuracy increasing of random processes parameters estimation. These theoretical results can be applied in different spheres of data analyzing and signal processing when random processes have some structure.","PeriodicalId":37704,"journal":{"name":"Serbian Journal of Electrical Engineering","volume":"15 1","pages":"365-370"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68752547","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: 7
Analysis on various optimization techniques used for Load Frequency Control in power system 电力系统负荷频率控制的各种优化技术分析
Serbian Journal of Electrical Engineering Pub Date : 2018-01-01 DOI: 10.2298/SJEE1803249K
Neelamsetti Kumar Kirn, V. Indragandhi
{"title":"Analysis on various optimization techniques used for Load Frequency Control in power system","authors":"Neelamsetti Kumar Kirn, V. Indragandhi","doi":"10.2298/SJEE1803249K","DOIUrl":"https://doi.org/10.2298/SJEE1803249K","url":null,"abstract":": In a unified power system the Load Frequency Control (LFC) is taken for review looking at all aspects with various optimization techniques for optimizing the parameters of PI, PID and Fuzzy controllers. The power system with multi area consists of conventional, renewable and combination of both with some energy devices like SMES, battery sources is analyzed specifically in this manuscript. The controllers are designed for a deregulated environment of a power system for LFC. The Model Predictive Control (MPC) and some other control techniques are used to control LFC under various disturbances like GRC and dead band control. For the readers ease of understanding the time response comparison graph of the controller for single and multiple areas of power system is depicted.","PeriodicalId":37704,"journal":{"name":"Serbian Journal of Electrical Engineering","volume":"15 1","pages":"249-273"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68752047","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
The mathematical model for analysis and evaluation of the transient process of the three-phase asynchronous machine performance 建立了三相异步电机暂态过程性能分析与评价的数学模型
Serbian Journal of Electrical Engineering Pub Date : 2018-01-01 DOI: 10.2298/sjee1803319m
N. Marković, Jeroslav Živanić, Z. Lazarevic, B. Iricanin
{"title":"The mathematical model for analysis and evaluation of the transient process of the three-phase asynchronous machine performance","authors":"N. Marković, Jeroslav Živanić, Z. Lazarevic, B. Iricanin","doi":"10.2298/sjee1803319m","DOIUrl":"https://doi.org/10.2298/sjee1803319m","url":null,"abstract":"This paper describes an adopted method which could be used in transient process modelling of three‒phase asynchronous machines on the computer. Converter asynchronous electric machine feeding requires a detailed research of the transient process influence and the dynamic states of energy exchange between the electrical circuit feeding and the machine itself. A mathematical model has been formulated in order to solve the transient process of the three-phase asynchronous electric machine referring to the two asynchronous machines and containing two matrix models defined by Park’s q d  components. In the system of symmetrical components the state and the operation of the first machine was defined based on relations and operation conditions of a direct sequence system and of other machines based on relations and operation conditions of an inverse sequence system. The new method has been derived from the existing psbpwm MATLAB package. The new model simulates the state and operation of a single machine with identical parame-ters through the state and operation of the two machines with identical parameters: the first in a direct sequence system and the others in an inverse sequence system. Operation analysis of the three‒phase induction machine is limited to a transient process occurring in the right angled shape of voltage feeding. The new presented model can, with certain limitations, be applied not only to a three‒phase asynchro-nous machine model but to other alternating current machines which have a stator and a rotor. The experiment has been performed following an example of asym-metrical feeding followed by inverse component phenomena of electrical and mechanical values in the machine.","PeriodicalId":37704,"journal":{"name":"Serbian Journal of Electrical Engineering","volume":"15 1","pages":"319-337"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68752458","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: 1
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