Articles

Access the latest knowledge in applied science, electrical engineering, computer science and information technology, education, and health.

Filter Icon

Filters article

Years

FAQ Arrow
0
0

Source Title

FAQ Arrow

Authors

FAQ Arrow

30,033 Article Results

The Role of Journal Writing in Senior High School Students’ Attitude toward Mathematics

10.11591/ijere.v7i2.13054
Ivee Kalalo Guce
The study investigated the influence of journal writing on the senior high school students’ attitude toward mathematics. A mixed-method approach, particularly the convergent parallel design, was used in this study. Using Scale on Attitude Toward Mathematics (SATM) (Guce & Talens, 2013), the students’ attitude toward the subject was measured in four subscales—liking or disliking mathematics, tendency to engage in or avoid mathematical activities, belief that one is good or bad in mathematics and belief that mathematics is useful or useless. Using focus group discussion, the insights of the students on journal writing as a mathematics class activity were gathered. Results using quantitative data revealed positive significant differences in the attitude of the respondents in terms of (i) liking mathematics and (ii) having the tendency to engage in mathematical activities. This aligned with the result in the focus group discussion which suggested that students perceive journal writing as a helpful tool for them to enjoy mathematics and engage in it. The activity, thus, may be regarded as a means to improve students’ attitude toward mathematics.
Volume: 7
Issue: 2
Page: 132–141
Publish at: 2018-06-01

Modular Approach to Implement Model Predictive Control on Three Phase Voltage Source Inverter

10.11591/ijpeds.v9.i2.pp897-904
Muhammad Abbas Abbasi , Abdul Rashid Bin Husain , Hasan Alqaraghuli
A modular abstraction is presented to implement model predictive control (MPC) on a three phase two level voltage source inverter to control its output current. Traditional ways of coded implementation do not provide insights into the complex nature of MPC; hence a more intuitive, logical and flexible approach for hardware implementation is conceptualized in the form of signal flow graphs (SFGs) for estimation, prediction and optimization. Simulation results show good performance of the approach and easier code generation for real time implementation. RL load is assumed for the inverter and the importance of choosing load inductance and sampling time ratio is emphasized for better control performance.
Volume: 9
Issue: 2
Page: 897-904
Publish at: 2018-06-01

Smart Monitoring System of DC to DC Converter for Photovoltaic Application

10.11591/ijpeds.v9.i2.pp722-729
Jameel Kadhim Abed
This paper presents a new smart monitoring system designed based on dc to dc converter for photovoltaic application. This system design according two parts to monitor input-output voltages and currents for dc/dc converter, (a) control system: the control system using Arduino NANO as microcontroller to read the measuring voltage and current values from sensor circuits of voltage and current. The measuring data send by Bluetooth HC-05 to end user (monitor system). Bluetooth as wireless communication between the control system and monitoring system (end users). (b) monitoring system: The monitoring system application program as a new application designed to monitor the received data from control system from safety distance (around 10m). the application program designed by the open source AppyBuilder software. The AppyBuilder is an open source software for easily building Android smartphone application. The advantages of the final circuit can be used to monitor step-up or step-down topologies, low-cost, and high-efficiency performance.
Volume: 9
Issue: 2
Page: 722-729
Publish at: 2018-06-01

Item Response Theory: An Introduction to Latent Trait Models to Test and Item Development

10.11591/ijere.v7i2.12900
Ado Abdu Bichi , Rohaya Talib
Testing in educational system perform a number of functions, the results from a test can be used to make a number of decisions in education. It is therefore well accepted in the education literature that, testing is an important element of education. To effectively utilize the tests in educational policies and quality assurance its validity and reliability estimates are necessary. There are two generally acceptable frameworks used in evaluating the quality of test in educational and psychological measurements, these are; Classical Test Theory (CTT) and Item Response Theory (IRT). The estimates of test items validity and reliability depend on a particular measurement model used. It is vital for a test developer to be familiar with the different test development and item analysis methods in order to facilitate the development of a new test. The CTT is a traditional approach which was widely criticise in the measurement community for its shortcomings such as sample dependency of coefficient measures and estimates of measurement error. However, the IRT is a modern approach which provides solutions to most of the CTT’s identified shortcomings. This paper therefore, provides a comprehensive overview of the IRT and its procedures as applied to test item development and analysis. The paper concludes with some suggestions for test developers and test specialists at all levels to adopt IRT for its identified crucial theoretical and empirical gains over CTT. IRT based parameter estimates should be superior and reliable than CTT based parameter estimates. With these features, IRT can help resolve the problems associated with test design based on CTT.
Volume: 7
Issue: 2
Page: 142–151
Publish at: 2018-06-01

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

Age Constraints Effectiveness on the Human Community Based Genetic Algorithm (HCBGA)

10.11591/ijai.v7.i2.pp78-82
Nagham A. Al-Madi , Amnah A. El-Obaid
In this paper, we use under-age constraints and apply it to the Traveling Salesman Problem (TSP). Values and results concerning the averages and best fits of both, the Simple Standard Genetic Algorithm (SGA), and an improved approach of Genetic Algorithms named Human Community Based Genetic Algorithm (HCBGA) are being compared. Results from the TSP test on Human Community Based Genetic Algorithm (HCBGA) are presented. Best fit solutions towards slowing the convergence of solutions in different populations of different generations show better results in the Human Community Based Genetic Algorithm (HCBGA) than the Simple Standard Genetic Algorithm (SGA).
Volume: 7
Issue: 2
Page: 78-82
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
Show 1449 of 2003

Discover Our Library

Embark on a journey through our expansive collection of articles and let curiosity lead your path to innovation.

Explore Now
Library 3D Ilustration