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30,895 Article Results

Improvement Potential and Exergy Analyses of Photovoltaic Thermal with and without ∇-absorber Collector

10.11591/ijpeds.v9.i4.pp1792-1798
Saprizal Hadisaputra , Muhammad Zohri , Hardani Hardani , Ahmad Fudholi
The combination of a solar thermal and photovoltaic system is called photovoltaic thermal system (PVT). The PVT system with and without -absorber has been intended to harvest both hot air and electricity. The hot air that is produced is used in the cooling process of the photovoltaic panel and then to improve the efficiency of the photovoltaic panel. The experimental investigation was conducted at the mass flow rate from 0.0069 kg/s to 0.0491 kg/s and solar radiation of 522 W/m2 and 820 W/m2 in the National University of Malaysia. The using -absorber collector increases exergy and exergy efficiency of PVT system. The improvement potential comparatively upsurges with cumulative the mass flow rate.
Volume: 9
Issue: 4
Page: 1792-1798
Publish at: 2018-12-01

Parents’ Roles in Overcoming Elementary Students’ Learning Difficulties

10.11591/ijere.v7i4.15015
Ika Maryani , Noven Kusainun , Laila Fatmawati , Vera Yuli Erviana , Muhammad Nur Wangid , Ali Mustadi
This research aims to identify learning problems and the parents’roles in overcoming learning difficulties of 5th-grade students of Muhammadiyah Karangturi Elementary School, Bantul, Yogyakarta. Research participants were six students with learning difficulties, six parents, and four teachers. Selection of subjects used purposive sampling technique. Research object was the parents’ roles in overcoming students’ learning difficulties. This research was a qualitative research with data collection techniques in the form of observation, interviews, and documentation. Data analysis technique was the interactive model (data collection, data reduction, data models, and drawing conclusions). The results showed that the problems experienced by students with learning difficulties in Muhammadiyah Karangturi Elementary School were lower than average learning outcomes, slow understanding, and lack of reasonable attitudes, behavior, and emotional symptoms during the learning process. The parents’ roles in overcoming students’ learning difficulties are finding tutoring institutions for children, accompanying children when coming and going home from school, being good listeners, accompanying learning activities at home, taking children on the first day of school, meeting with teachers through parents association, and present at the distribution of learning outcomes report card.
Volume: 7
Issue: 4
Page: 305-312
Publish at: 2018-12-01

Modeling Solar Modules Performance Under Temperature and Solar Radiation of Western Iraq

10.11591/ijpeds.v9.i4.pp1842-1850
Zaid Hussein Ali , Abdullah Khalid Ahmed , Amer Tayes Saeed
This paper demonstrates a mathematical representation of Photovoltaic (PV) solar cells and hence panels performance. One-diode solar cell model is implemented to simulate the cell and extract the performance indications. The tested PV modules are BP Solar (60 Watt) and Synthesis Power (50 Watts), which are operating in a PV generation system in the University of Anbar - Iraq, College of Applied Sciences. The math model demonstrates Power versus Voltage (P-V) characteristic curves to depict and study various parameters with affecting variations in the PV array performance. The parameters include ambient and cell temperature degrees and solar irradiance (G) level which are the main elements to dictate the productivity of a solar system. G is represented by sun unit (1 sun=1 kW/m2). The outcomes of the simulation model characteristics curves have been compared with curves provided by the tested modules data sheets. MATLAB software has been used to simulate the model and extract the results. This paper also investigated photovoltaic simulation with maximum power point tracking (MPPT) converter to evaluate hence predict the behaviors of the whole photovoltaic DC current generation using PSIM Power Electronics program. The model focuses on the basic components in PV systems; The panel and the DC-DC converter. The modeling outcome data will be used as a reference verifying the performance of the tested modules during the year seasons under the dominating dusty hot weather in western Iraq.
Volume: 9
Issue: 4
Page: 1842-1850
Publish at: 2018-12-01

Study of Grid Connected Wind Energy System with Fuzzy Logic Based MPPT Controller

10.11591/ijra.v7i4.pp251-261
Jayalakshmi N. S , Sachin S
Renewable energy sources (RESs) are gaining more importance due to depleting fossil fuel sources in few decades. When compared to other RESs wind energy system is widely available and user friendly in nature. This paper presents modelling and simulation of grid connected PMSG based wind energy conversion system with P&O maximum power point tracking (MPPT) control technique.  The PQ controller is used for grid tied inverter to exchange real and reactive power with DC bus voltage regulation. The fuzzy logic controller (FLC) is used for MPPT implementation as it provides better performance as compared to the traditional PID controllers. The various case studies are considered for power management between wind system and the utility grid and the results are evaluated in MATLAB/ Simulink platform.
Volume: 7
Issue: 4
Page: 251-261
Publish at: 2018-12-01

Self-tuning Fuzzy Task Space Controller for Puma 560 Robot

10.11591/ijra.v7i4.pp273-282
Azita Azarfar
Since in most robot applications the desired paths are determined in task space or Cartesian space, it is important to control the robot arm in task space. In this paper a fuzzy controller with modifiable scaling factors is proposed to control the robot end-effector in task space. The controller is a fuzzy system with a mechanism to change the scaling factors when the error is bounded under a predetermined value. The controller is designed in joint space and is developed to work space by using inverse Jacobian strategy. The simulations results on Puma 560 robot manipulator illustrate the high performance of presented control method.
Volume: 7
Issue: 4
Page: 273-282
Publish at: 2018-12-01

Analytically Modeling, Design and Analysis a Nonlinear Controller for a STATCOM operations

10.11591/ijra.v7i4.pp221-231
J. K. Moharana
The concept of H Control is extended, in principle, to the SVPWM (Space Vector Pulse Width Modulation) based inverter switching of a STATCOM (STATic synchronous COMpensator) device. The SVPWM assures a greater value of modulation factor in the undermodulation as well as the overmodulation range compared to SPWM (Sine Pulse Width Modulation) i.e. a much higher fundamental content. In the present work, the STATCOM has been modeled and its model is nonlinear in  (phase angle between fundamental of system voltage and output voltage of STATCOM. The effect of increased modulation index and lower harmonic distortion has been studied through simulation w.r.t. different performance indices and dynamic response of relevant variables. A PI and an H Controller have been designed for closed-loop control of the system. It is found through simulation that H controller gives better response than PI controller for nonlinear system.
Volume: 7
Issue: 4
Page: 221-231
Publish at: 2018-12-01

The Examination of the 4th Graders’ Reading Comprehension Skills in Terms of the Sentiments Given in Reading Texts

10.11591/ijere.v7i4.13969
Esra Çetin , Sabri Sidekli
This study aims to investigate reading comprehension skills of the 4th graders in terms of the sentiments given in the reading text and to reveal that whether there is a meaningful difference for reading comprehension skills of different student groups or not.The sampling of the study has been selected randomly and it has been limited in primary schools in Muğla, Turkey. The sampling has been covered totally 387 4th graders, 209 of them have been female and 178 of them have been male students. The data collection instruments in the study have been determined as a personal information form and an achievement test on reading comprehension skills in terms of sentiments given in the reading texts. The answers of the students for the achievement test have been analyzed via percentage, frequency and arithmetic mean.According to the findings of the study; For the sentiments given in the reading texts, in line, the mostly understandable sentiments are happiness, fear and sadness. Additionally, there was a mean difference in terms of the level of reading comprehension skills. The students were mostly aware of texts containing happiness, and they understood sorrow in texts at least.
Volume: 7
Issue: 4
Page: 317-330
Publish at: 2018-12-01

Empowering E-governance with E-voting

10.11591/ijeecs.v12.i3.pp1081-1086
Amarjeet Singh , Ramakanth Kumar P , Nagaraj G Cholli
Advances in Information and Communications Technology (ICT) have impacted the society in many ways. Be it education, healthcare, media or governance, the transformation is visible. As individual entities like education or healthcare systems have already implemented ICT to certain extent, e-governance is yet to make a significant progress even though several initiatives are undertaken. E-governance means activities like voting, administration, financial transaction etc., are enabled using automation systems.  This paper discusses one part of the e-governance; e-voting. As e-voting empowers government, there are lot of challenges in implementing the e-voting system considering security threats and confidentiality involved in it. Online voting (e-voting) needs to be deployed as more convenient, relatively secure and less resource consuming system.   E-voting system should ensure convenience for people to be able to access the system from personal or public computer with security and confidentiality. The presence of e-voting system with all the necessary security measures and convenience can be a potential solution for low voter turnout at the polls.  The presented work demonstrates an online e-voting prototype system called SecureV. The proposed model achieves specific tasks namely, maintaining the anonymity of the voter, encryption of the vote, integrity check and avoids second time voting.
Volume: 12
Issue: 3
Page: 1081-1086
Publish at: 2018-12-01

Mediation Effect of Resilience on The Relationship Between Self-Efficacy and Competitiveness Among University Students

10.11591/ijere.v7i4.15725
Kingston K.F. Moke , Calvin K.W. Chang , Kususanto Prihadi , Chee Leong Goh
This study aims to evaluate the mediation role of resilience on the link between self-efficacy and competitiveness among university students in Malaysia. One hundred and thirty-six participants from several universities in Malaysia were recruited to respond to an online form consisted of the following scales: adapted versions of brief resilience scale from Smith et al, self-efficacy scale from Biemann, Kearney and Marggraf, and Personal Development Competitive Attitude Scale  from Ryckman, Hammer, Kaczor and Gold. Data was analyzed by using SPSS with PROCESS Macro and full mediation has been observed. Bias-corrected bootstrap confidence interval test indicated that the indirect effect of self-efficacy on competitiveness was significant and the Sobel test had confirmed the significance of the mediation. Further discussion, limitation and suggestion are discussed in the end of the paper.
Volume: 7
Issue: 4
Page: 279-284
Publish at: 2018-12-01

Backstepping Control for MPPT and UPF of a Three Phase Single Stage Grid Connected PV System

10.11591/ijra.v7i4.pp262-272
M. El malah , A. Ba-razzouk , M. Guisser , E. Abdelmounim , M. Madark
This paper presents a new control methodology of a three phase grid connected photovoltaic system without using the intermediary DC/DC converter. Based on the synchronized nonlinear model of the whole photovoltaic system, two controllers have been proposed for the three-phase inverter in order to ensure the operation of the PV system at the maximum power point with unity power factor and minimum grid disturbance. Grid synchronization has been ensured by a three-phase 2nd order PLL (Phase-Locked Loop). The stability of each controller is demonstrated by means of Lyapunov analysis and evaluated under changing atmospheric conditions using the Matlab/Simulink environment, the simulation results clearly demonstrate the performance provided by each controller.
Volume: 7
Issue: 4
Page: 262-272
Publish at: 2018-12-01

Hierarchical Inspection System Using Visual and MFL Probe Robots

10.11591/ijra.v7i4.pp283-296
Uvais Qidwai , Muhammad Akbar , Muhammad Maqbool , Mohammed Jahanshahi
Structural Health Monitoring (SHM) represents a critical appurtenance to modern engineering that amalgamates the skills and techniques from various disciplines of engineering and computational science. Modern civil architectures, involving high-rise buildings, complex structural designs, and innovative shapes, on one hand represent the urban development, but at the same time is a challenge from sustainability perspective. In order to ensure the tenability of such structures, advanced SHM procedures need to be developed. The presented work in this paper is an effort on these lines. The wear and tear in the buildings related to weather, as well as other natural disasters, needs to be monitored regularly and systematically in order to prevent any serious structural damage. In current SHM practices, human experts are deployed at various structurally critical places on these buildings to perform specific measurements and analyze them to decide on the structural health condition. This simple approach is becoming more and more complicated as well as perilous for the human personnel involved, due to the modern architecture that involves greater heights, and complex structures. The proposed system utilizes flying and crawling/roving robots for this purpose. The flying robots, first, scan the surface of the building to any height needed, and then the custom-designed algorithms analyze the images from these scans in order to discern the possible defects/anomalies in the structure. Using these defect pointers, the custom-designed rover robot on top of the structure lowers a robotic probe that scans only those areas for substantiating the anomalies and the degree of defects present.
Volume: 7
Issue: 4
Page: 283-296
Publish at: 2018-12-01

Dental and Oral Health Education for Elemetary School Students through Patient Hygiene Performance Index Indicator

10.11591/ijere.v7i4.14856
Septian Emma Dwi Jatmika , Muchsin Maulana
Caries is a problem that often occurs in school-age children. Special Region of Yogyakarta is a province that has a high DMF-T index by 5.9 and exceeds the national DMF-T index. One of the efforts to improve dental and oral health of school-age children is the health education method using simulation methods, as well as simple techniques that may attract children's attention and be understood. The aim of the current study is to knowing the influence of oral and dental hygiene education intervention on dental and oral hygiene level at SD Negeri 3 Sleman students. This research used a kind of quasi experimental research with one group pretest posttest design. The research was done in SD Negeri 3 Sleman, the sample used was the 3rd graders from 57 students in 2017. The intervention was done by dental and oral hygiene education. Respondents were examined related to their dental and oral hygiene levels. It was measured by the PHP Index (Patient Hygiene Perfomance) before and after the intervention. According to results, The average score of respondents’dental and oral hygine pre test was 0.0823 and the average post test score of respondents’dental and oral hygiene was 1.4830. There is the difference of 1.4007. This shows an increament in oral hygiene of the respondent before and after the education. The results of statistical analysis show that there is an influence of oral and dental hygiene which pvalue 0,000 <0.05. Thus, there is a need for dental and mouth hygiene education to be conducted regularly and delivered with an interesting method.
Volume: 7
Issue: 4
Page: 259-263
Publish at: 2018-12-01

Smart Home Automation System based on Arduino

10.11591/ijra.v7i4.pp215-220
Bouzid Mohamed Amine , Chaib Fatima Zohra , Hamani Ilyes , Aid Lahcen , Allaoui Tayeb
Intelligent home environments are environments that attempt to ease the user's life in different ways and make it more comfortable using the technology. This paper present the principle of realizing a home control interface based on an. Arduino UNO R3 board equipped with a programmable ATmega328 microcontroller. The sketch to be uploaded to the Arduino is written in C language. A desktop application was created in C # language to communicate with the Arduino via the serial port, thus facilitating repetitive tasks such as lighting control, opening / closing doors. A temperature / humidity sensor, an alarm (motion sensor + buzzer), garden lighting and automatic control of the TV via an IR receiver + IR transmitter have been added without forgetting manual control
Volume: 7
Issue: 4
Page: 215-220
Publish at: 2018-12-01

Orientation to Happiness as a Predictor of University Students’ Engagement

10.11591/ijere.v7i4.15446
Maria Fernanda Durón-Ramos , Fernanda García Vázquez
There is empirical evidence for a close link between positive personal components and students' engagement in academic activities. Personal well-being is a construct that can be studied from a variety of angles. Recent studies point to the relevance of orientation to happiness examining three types of well-being. The main objective of this study is to test the relationship that orientation to happiness has with university students' engagement at a public institution in northern Mexico. A stratified probabilistic sample of 266 students was used. The internal consistency of the scales was analyzed using the SPSS package and a model of structural equations in the EQS program. Results indicate is a direct and significant relationship between the orientation to happiness and the students' engagement. This supports the importance of promoting positive factors in students to improve their academic and personal development.
Volume: 7
Issue: 4
Page: 294-298
Publish at: 2018-12-01

Design of Robust Controller for Higher Order Interval System using Differential Evolutionary Algorithm

10.11591/ijra.v7i4.pp232-250
D. Srinivasa Rao , M. Siva Kumar , M. Ramalinga Raju
This paper describes the design of the robust PI/PID controller for the higher order interval system via its reduced order model using the differential evolution (DE) algorithm. A stable reduced interval model is generated from a higher order interval system using the DE in order to minimize the cost and reduce the complexity of the system. This reduced order interval numerator and denominator polynomials are determined by minimizing the Integral Squared Error (ISE) using the DE. Then, using reduced order interval model, a robust PI/PID controller is designed based on the stability conditions for determining robust stability of interval system. Finally, using these stability conditions, a set of inequalities in terms of controller parameters is obtained from the reduced order closed loop characteristic polynomial. Then these inequalities are solved to obtain robust controller parameters with the help of a DE algorithm. The designed, robust controller from the reduced order interval model will be attributed to the higher order interval system. The designed PI/PID controller from our proposed method not only stabilizes the reduced order model, but also stabilizes the original higher order system. The viability of the proposed methodology is illustrated through the numerical example of its successful implementation. The efficacy of the proposed methodology is also evaluated against the available approaches presented in the literature and the results were successfully implemented.
Volume: 7
Issue: 4
Page: 232-250
Publish at: 2018-12-01
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