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30,376 Article Results

The Resistance Comparison Method Using Integral Controller for Photovoltaic Emulator

10.11591/ijpeds.v9.i2.pp820-828
Razman Ayop , Chee Wei Tan , Cheng Siong Lim
A Photovoltaic (PV) emulator is a device that produces a similar output as the PV module and it is useful for testing the PV generation system. This paper present a new and simple control strategy for the PV emulator using the combination of the Resistance Comparison Method with the Integral Controller. The closed-loop buck converter system with the current-mode controlled and the single diode model are used for the PV emulator. The results obtained from the proposed PV emulator are compared with the conventional PV emulator using the Direct Referencing Method as the control strategy. The proposed PV emulator produces a more accurate output, 74 % faster transient response, and a lower output voltage ripple compared to the conventional PV emulator.
Volume: 9
Issue: 2
Page: 820-828
Publish at: 2018-06-01

The Effect of Parameters Variation on Bilateral Controller

10.11591/ijpeds.v9.i2.pp648-659
Sari Abdo Ali , Muhammad Fahmi Miskon , Ahmad Zaki Hj Shukor , Marwan Qaid Mhoammed
This paper analyzes the effects of the bilateral control parameters variation on the stability, the transparency and the accuracy, and on the operational force that is applied to DC motor and the master system. The bilateral controller is designed for rehabilitation process. PD controller is used to control the position tracking and a force gain controller is used to control the motor torque. DOB eliminate the internal disturbance and RTOB to estimate the joint torque without using sensors. The system consists of two manipulators, each manipulator has 1dof, master and slave teleoperation system, 4 control-architecture channel, DOB and reaction force observer. The master system is attached to human oberator. The slave system is attached to external load. The aim in this paper is to design the controller so that it requires less force to move the master manipulator and at the same time achieve high performance in position tracking.
Volume: 9
Issue: 2
Page: 648-659
Publish at: 2018-06-01

Democratic Perception and Attitudes of the Pre-Service Music Teachers in Turkey

10.11591/ijere.v7i2.13141
Hatice Onuray Eğilmez , Özgür Eğilmez , Doruk Engür
Democracy, a lifestyle as much as it is a form of government, begins to be learned in the family. The youth observe and acquire the democratic attitudes of their parents. The task of passing it on to the new generations and helping them acquire democratic values is the mission of schools, namely teachers. It is a commonly known fact that developmental level of countries shows parallelism with the democratic attitudes of individuals. It is important to understand the democratic perceptions and attitudes of teachers who are responsible for positioning democratic structure and thus raising the democratic level of countries. For this reason, the research aims to examine the democratic perceptions and attitudes of music teacher candidates in terms of some variables. Data collected using the democratic attitude scale were analyzed using t-test, Kruskal-Wallis H test, and Spearman’s correlation coefficient. Results showed that attitude scores did not change according to gender, level of parents’ education or the year students were in. Scale scores were negatively correlated with the amount of parents’ income. There was no correlation between the students’ GPAs and the scale scores. Music teaching requires a democratic environment intrinsically; therefore, the democratic perceptions and attitudes of the music teacher candidates who will carry out the music lessons in which they should maintain the democratic environment must be determined. As aforementioned notions suggest, this study is of the essence since the results will shed light on the academic staff in the institutions that train music teachers.
Volume: 7
Issue: 2
Page: 100–108
Publish at: 2018-06-01

Positioning of a Wireless Relay Node for Useful Cooperative Communication

10.11591/ijeecs.v10.i3.pp959-965
Tariq Muhamad Amjad , Elsheikh Mohamed Ahmed Elsheikh
Given the exorbitant amount of data transmitted and the increasing demand for data connectivity in the 21st century, it has become imperative to search for pro-active and sustainable solutions to the effectively alleviate the overwhelming burden imposed on wireless networks. In this study a Decode and Forward cooperative relay channel is analyzed, with the employment of Maximal Ratio Combining at the destination node as the method of offering diversity combining. The system framework used is based on a three-node relay channel with a source node, relay node and a destination node. A model for the wireless communications channel is formulated in order for simulation to be carried out to investigate the impact on performance of relaying on a node placed at the edge of cell. Firstly, an AWGN channel is used before the effect of Rayleigh fading is taken into consideration. Result shows that performance of cooperative relaying performance is always superior or similar to conventional relaying. Additionally, relaying is beneficial when the relay is placed closer to the receiver. 
Volume: 10
Issue: 3
Page: 959-965
Publish at: 2018-06-01

dSPACE DS1104 Based Real Time Implementation of Sliding Mode Control of Induction Motor

10.11591/ijpeds.v9.i2.pp546-558
Aymen Omari , I. K. Bousserhane , A. Hazzab , B. Bouchiba
In this paper, the design of a speed control scheme based on a total sliding mode control for Indirect Field Oriented of a three phase induction motor (IM) is proposed. Firstly, the indirect field oriented control is derived. Then, sliding mode control design is investigated to achieve a speed tracking objective under different load torque disturbance. Finally a dSPACE DS1104 R&D board is used to implement the proposed scheme. The experimental results released on 0.25 kW slip-ring IM show a high dynamic performance, fast transient response without overshot as well as a good load disturbances rejection response.
Volume: 9
Issue: 2
Page: 546-558
Publish at: 2018-06-01

A Novel Line Current Control Strategy to Control the Real Power Flow at PCC using H-bridge Inverter

10.11591/ijpeds.v9.i2.pp602-609
Qusay Salem , Jian Xie
This paper presents the power flow control between the main grid and the microgrid in low-voltage distribution network using H-bridge inverter. Controlling the real power flow in the line using the H-bridge inverter is investigated by implementing the line current control strategy. The feasibility of the proposed H-bridge inverter and its control strategy is validated by varying the line current reference. Hence, the H-bridge inverter will operate in its inductive or capacitive operation mode depending on the reference current value and the output of the PI controller in the control unit. The control strategy of the microgrid distributed generators has also been investigated in which P/V droop characteristics is applied to the power control of each DG in the microgrid. The effectiveness of the proposed approaches is validated through simulations. 
Volume: 9
Issue: 2
Page: 602-609
Publish at: 2018-06-01

PAPR Reduction Techniques in Generalized Inverse Discrete Fourier Transform Non-Orthogonal Frequency Division Multiplexing System

10.11591/ijeecs.v10.i3.pp1045-1052
Iram Maisarah Mokhtar , Norulhusna Ahmad , Hazilah Mad Kaidi , Mohd Azri Mohd Izhar , Norliza Mohamed
A promising system of Generalized Inverse Discrete Fourier Transform Non-Orthogonal Frequency Division Multiplexing (GIDFT n-OFDM) system can fulfil the requirement of supporting higher data rate in Fifth Generation (5G) technology. However, this system experience High Peak to Average Power Ratio (PAPR) due to massive number of subcarriers signal is transmitted. In this paper, three types of usual PAPR reduction techniques were applied in GIDFT n-OFDM system which are Clipping, Partial transmit Transform (PTS) and Selective Mapping (SLM). The system performance is compared and evaluated using Complementary Cumulative Distribution Function (CCDF) plot. Simulation results show that SLM technique give significant reduction of PAPR 9 dB of the original performance.
Volume: 10
Issue: 3
Page: 1045-1052
Publish at: 2018-06-01

A Mixed Method Research on Peer Assessment

10.11591/ijere.v7i2.12770
Gokhan Izgar , Ahmet Oguz Akturk
The purpose of this study is to investigate the relationship between peer assessment and instructor assessment and make a comparison with views of preservice teachers. Since qualitative and quantitative methods were used together in the study, it was grounded on the mixed method approach. The quantitative data in this study, in which 27 preservice teachers participated on a voluntary basis, were obtained from scoring rubric whereas qualitative data were obtained from a semi-structured interview form prepared by the researchers. Statistical analyses were conducted to analyze the quantitative data collected within the scope of the study, whereas Pearson Product-Moment Correlation Coefficient was used to analyze the relationship between instructor assessment and peer assessment, and paired samples t test was used to determine the differences between pairwise groups. The qualitative data, on the other hand, were analyzed using the content analysis technique. As a result of the analysis, it was seen that there was a positive and significant correlation between instructor assessment and peer assessment. When the preservice teachers’ views were examined, those views rose to prominence stating that making assessments contributed to learning; they grew aware of imperfect knowledge; questioning and critical thinking improved, and fair assessment skills developed. This was interpreted to mean that preservice teachers could distinguish between adequate and inadequate work. However, when the preservice teachers’ views concerning their assessments by their peers were examined, the view attracted attention stating that friendship relations and personal problems affected assessment negatively and therefore peers gave low scores. At this point, when the mean scores were examined, it was seen that mean peer scores were higher than instructor mean scores. This was interpreted to mean that some preservice teachers did not have confidence in their peers.
Volume: 7
Issue: 2
Page: 118–126
Publish at: 2018-06-01

Finite-Control-Set Predictive Current Control Based Real and Reactive Power Control of Grid-Connected Hybrid Modular Multilevel Converter

10.11591/ijpeds.v9.i2.pp660-667
Rashmi Ranjan Behera , Amarnath Thakur
This paper proposes the grid application of modified three-phase topology of Modular Multilevel Converter (MMC) using finite-control-set predictive control. This topology has reduced number of switch counts compared to the conventional MMC, eliminates the problem of circulating current and having higher efficiency. A single dc source is required to produce sinusoidal outputs. The number of sub-modules (SMs) in this topology is half of the SMs required in case of MMC, in addition to a single H-bride circuit per phase. The finite-control-set predictive current control scheme for the grid connected dc source through the Hybrid Modular Multilevel Converter (HMMC). This controller controls the desired real and reactive power demand of the grid instantaneously. The simulation study of a three phase grid connected system has been done in Matlab/Simulink and the results are provided for the different real and reactive power demands, to validate the concepts.
Volume: 9
Issue: 2
Page: 660-667
Publish at: 2018-06-01

Elementary School Third Grade Students’ Expectations of Their Teachers in The Course of Language Education

10.11591/ijere.v7i2.13452
Sabri Sidekli , Zeliha Cura , Alper Yorulmaz
The purpose of the study is to determine the elementary school third grade students’ expectations of their classroom teachers within the context of the course of language education. The sampling of the study is comprised of 200 elementary school third grade students attending elementary schools in the Milas Province of the city of Muğla. The data were gathered by means of the questionnaire, which had six sub-categories, in order to identify students’ expectations of their teachers. The findings of the study revealed that the students have high expectations of their teachers in terms of the sub-dimensions of active participation, verbal participation, written participation, participating in reading, inclusion of the topics and measurement and evaluation. The students’ expectations of their teachers in relation to the sub-dimension of measurement and evaluation were found to be varying significantly depending on the gender variable. This difference is in favor of boys.
Volume: 7
Issue: 2
Page: 159-166
Publish at: 2018-06-01

Nonlinear Adaptive Control for Wind Turbine Under Wind Speed Variation

10.11591/ijra.v7i2.pp87-95
Abdelhaq.Amar bensaber , Mustapha Benghanem , Mohammed.Amar bensaber , Abdelmadjid. Guerouad
Wind turbines components work as nonlinear systems where electromechanical parameters change frequently [1], which makes nonlinear control an interesting solution to prevail good efficiency. SMC has been largely used in electrical power applications because it offers interesting features like robustness to parametric uncertainties and external disturbances, to conquer the biggest drawback of the SMC, adaptation strategy consists on updating the sliding gain and the turbine torque to contribute with some important characteristics such as chatter-free performance, heftiness, robustness and secure power system operation. Matlab tests are introduced and compared.
Volume: 7
Issue: 2
Page: 87-95
Publish at: 2018-06-01

Determination of Secondary School 4th Grade Students’ Mental Models of the Astronomer

10.11591/ijere.v7i2.11371
Meryem Görecek Baybars , Büşra Tuğçe Kayabas
Teaching astronomy to young generations is of great importance because astronomy education helps us to better understand the world we are living in and to find answers to our questions. In this regard, the current study aimed to determine the secondary school 4th grade students’ mental models of the astronomer. The current research is designed as a descriptive study employing the special case study method. The study was conducted in a city located in the western part of Turkey. The study group is comprised of a total of 77 secondary school 4th grade students attending a state school. In line with the purpose of the study, a data collection tool consisted of 2 open-ended questions was developed. In light of the findings of the study, it can be argued that the mental models possessed by the students about the astronomer are the scientific model, the astronaut model and the celestial bodies model
Volume: 7
Issue: 2
Page: 94–99
Publish at: 2018-06-01

Grid and Force Based Sensor Deployment Methods in Wireless Sensor Network using Particle Swarm Optimization

10.11591/ijeecs.v10.i3.pp1287-1295
Aparna Pradeep Laturkar , Sridharan Bhavani , DeepaliParag Adhyapak
Wireless Sensor Network (WSN) is emergingtechnology and has wide range of applications, such as environment monitoring, industrial automation and numerous military applications. Hence, WSN is popular among researchers. WSN has several constraints such as restricted sensing range, communication range and limited battery capacity. These limitations bring issues such as coverage, connectivity, network lifetime and scheduling & data aggregation. There are mainly three strategies for solving coverage problems namely; force, grid and computational geometry based. PSO is a multidimensional optimization method inspired from the social behavior of birds called flocking. Basic version of PSO has the drawback of sometimes getting trapped in local optima as particles learn from each other and past solutions. This issue is solved by discrete version of PSO known as Modified Discrete Binary PSO (MDBPSO) as it uses probabilistic approach. This paper discusses performance analysis of random; grid based MDBPSO (Modified Discrete Binary Particle Swarm Optimization), Force Based VFCPSO and Combination of Grid & Force Based sensor deployment algorithms based on interval and packet size. From the results of Combination of Grid & Force Based sensor deployment algorithm, it can be concluded that its performance is best for all parameters as compared to rest of the three methods when interval and packet size is varied.
Volume: 10
Issue: 3
Page: 1287-1295
Publish at: 2018-06-01

Design of Robust Fractional-Order PID Controller for DC Motor Using the Adjustable Performance Weights in the Weighted-Mixed Sensitivity Problem

10.11591/ijra.v7i2.pp108-118
Toufik Amieur , Moussa Sedraoui , Oualid Amieur
This paper deals with the robust series and parallel fractional-order PID synthesis controllers with the automatic selection of the adjustable performance weights, which are given in the weighted-mixed sensitivity problem. The significant contribution of the paper is to achieve the good trade-off between nominal performances and robust stability for DC motor regardless its nonlinear dynamic behavior, the unstructured model uncertainties and the effect of the sensor noises on the feedback control system. The main goal is formulated as the weighted-mixed sensitivity problem with unknown adjustable performance weight.  This problem is then solved using an adequate optimization algorithm and its optimal solution leads to determine simultaneously the robust fractional PID controller, which is proposed by the series and the parallel fractional structures, As well as, the obtained optimal solution determines the corresponding adjustable performance weight. The proposed control technique is applied on DC motor where its dynamic behavior is modeled by unstructured multiplicative model uncertainty. The obtained performances are compared in frequency- and time-domains with those given by both integer controllers such classical PID and H∞ controllers.
Volume: 7
Issue: 2
Page: 108-118
Publish at: 2018-06-01

Exponential Reaching Law and Sensorless DTC IM Control with Neural Network Online Parameters Estimation based on MRAS

10.11591/ijra.v7i2.pp77-86
Legrioui Said , Rezgui Salah Eddine , Benalla Hocine
The most important problem in the control of induction machine (IM) is the change of its parameters, especially the stator resistance and rotor-time constant. The objective of this paper is to implement a new strategy in sensorless direct torque control (DTC) of an IM drive. The rotor flux based model reference adaptive system (MRAS) is used to estimate conjointly the rotor speed, the stator resistance and the inverse rotor time constant, the process of the estimation is performed on-line by a new MRAS-based artificial neural network (ANN) technique. Furthermore, the drive is complemented with a new exponential reaching law (ERL), based on the sliding mode control (SMC) to significantly improve the performances of the system control compared to the conventional SMC which is known to be susceptible to the annoying chattering phenomenon. An experimental investigation was carried out via the Matlab/Simulink with real time interface (RTI) and dSPACE (DS1104) board where the behavior of the proposed method was tested at different points of IM operation.
Volume: 7
Issue: 2
Page: 77-86
Publish at: 2018-06-01
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