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31,377 Article Results

The competencies of principals in ensuring sustainable education: Teachers' views

10.11591/ijere.v8i2.18273
Fatma Köybaşı Şemin
This study aimed to reveal the opinions of teachers about the competencies of school administrators in order to ensure the sustainability of education in schools. It was a pneumology study designed with qualitative research method. The study group consists of fifteen teachers from schools located in five different educational zones across the center of Sivas, a city in Central Turkey. Study data were analyzed with content analysis to determine the factors that provide educational sustainability in schools. According to the results; solidarity and structured work characteristics among school administrators to fulfill the objectives of the school affect the adequacy of education in a positive way; while institutionalism and limiting of the capacity have an opposite effect. In relation to capacity building for taking the school culture to future, school administrators have a high opinion of opening up to the neighborhood besides school culture supply and demand. Lastly, for carrying the school into the future, teachers expect school leaders to exhibit behaviors with emphasis on specific themes as ethics, motivation, and awareness.
Volume: 8
Issue: 2
Page: 201-212
Publish at: 2019-06-01

Non isolated coupled converter tied voltage source inverter drive

10.11591/ijpeds.v10.i2.pp645-652
A. Suresh Kumar , R. K. Pongiannan , C Bharatiraja , Adedayo Yusuff , N Yadaiah
The voltage source inverters (VSI) are ever required section in the AC motor drive and power system interface. The electrical drive segment, the VSI based drives are unavoidable and they are closely operated with induction motor, permanent magnate synchronous motor and BLDC motor. These drives are normally needed high torque-power characters. Hence, the input DC-link side voltage is increased with help of increasing input AC in the rectifier input. However, this causes the power quality disturbance in the AC main and DC-link. In order to go for a increasing the AC voltage, the rectifier out is connected with DC to DC boost converter and they are increasing the DC voltage to meet out the drive DC-link voltage demand. With this aim, the paper proposes the idea to connect high step non-isolated high gain coupled DC to DC converter with three phase VSI for drives applications. The proposed converter has an ability to increase the voltage five times and the counter winding arrangement ratio of the converter is help for the further increase of gain. Inn this interface the front end DC to DC converters inductors are charged by making the short circuit with inverter switching. The converter voltage gain is controlled by shoot through of the VSI switch (converter gain directly proportional to inverter shoot through). The proposed converter has a higher degree of freedom in their values of winding and output voltage. Hence, the DC-link voltage of the inverter can be extended in any level. The operation principle and modes of the proposed DC to DC Source tied VSI is analyzed and simulated using MATLAB-Simulink software simulation.  The laboratory based small scale power circuit is developed with help of control algorithm. The entire implementation is done through PIC microcontroller platform. The deign Investigation, system simulation and experimentation confirming the proposed DC to DC converter tied VSI drive system.
Volume: 10
Issue: 2
Page: 645-652
Publish at: 2019-06-01

Physics education students’ science process skills

10.11591/ijere.v8i2.16401
Darmaji Darmaji , Dwi Agus Kurniawan , Irdianti Irdianti
The purpose of this study was to determine the description of the process carried out in the physics education study program on the lens material. The process skills used in this study are the methods used, namely measurement, measurement and measurement processes which consist of table data, data, and training, conducting experiments. Total sampling technique was choosen to recruit 91 students to participate in the study. They are contracted in basic physics practicum courses. The results show that physics students have done their own lab work in the learning process that has been incorporated into the good category. The science process skills that are most mastered in concave movement practices are observations with a percentage of 51.65% and have an average of 82.76. Whereas for convex lens practices are skills and data that have good categories with a percentage of 81.32% and have an average of 73.67.
Volume: 8
Issue: 2
Page: 293-298
Publish at: 2019-06-01

Optimal PID controller of a brushless dc motor using genetic algorithm

10.11591/ijpeds.v10.i2.pp822-830
Muhammed A. Ibrahim , Ausama Kh. Mahmood , Nashwan Saleh Sultan
Brushless DC (BLDC) motor is commonly employed for many industrial applications due to their high torque and efficiency. This article produces an optimal designed controller of Brushless DC motor speed control depending on the genetic algorithm (GA). The optimization method is used for searching of the ideal Proportional–Integral-Derivative (PID) factors. The controller design methods of brushless DC motor includes three kinds: trial and error PID design, auto-tuning PID design and genetic algorithm based controller design. A PID controller is utilizing by conducted Integral absolute error criterion (IAE) and integral squared error (ISE) error criterion for BLDC motor control system. A GA-PID controller is designed to enhance the system performance by means of genetic algorithm. PID controller coefficients are calculated by GA to produce optimal PID as  hybrid PID with GA controller .The closed loop speed response of PID controller is experimented  for IAE and ISE error criteria. The suggested controller GA_PID is planned, modeled and simulated by MATLAB/ software program. A comparison output system performance monitored for every controller schemes. The results display that the time characteristics performance of GA-PID controller based on ISE objective function has the optimal performance (rise time, settling time, percentage overshoot) with other techniques.
Volume: 10
Issue: 2
Page: 822-830
Publish at: 2019-06-01

Teacher candidates’ state of using digital educational games

10.11591/ijere.v8i2.19260
Ayşe Alkan , Hüseyin Mertol
The rapidly developing information technologies of our age offer new opportunities in every aspect of our lives. The use of information technologies in educational environments is an important element in creating enriched learning environments. Educational digital games used in teaching-learning environments help students to develop motivation, problem-solving, strategy development skills and creativity. The purpose of this research was to determine the teacher candidates’ state of using digital educational games. The study group of the research consisted of 4th-grade teacher candidates who are studying in the social sciences and classroom teaching departments of Süleyman Demirel University during the 2018/2019 academic year. It has been found that men teacher candidates were more positive than women teacher candidates. Teacher candidates studying social sciences were more positive than those studying classroom teaching. Although teacher candidates were concerned about using educational digital games, they were eager to use these games.
Volume: 8
Issue: 2
Page: 344-350
Publish at: 2019-06-01

Optimum partition in flight route anomaly detection

10.11591/ijeecs.v14.i3.pp1315-1329
Mohammad Yazdi Pusadan , Joko Lianto Buliali , Raden Venantius Hari Ginardi
Anomaly detection of flight route can be analyzed with the availability of flight data set. Automatic Dependent Surveillance (ADS-B) is the data set used. The parameters used are timestamp, latitude, longitude, and speed. The purpose of the research is to determine the optimum area for anomaly detection through real time approach. The methods used are: a) clustering and cluster validity analysis; and b) False Identification Rate (FIR). The results archieved are four steps, i.e: a) Build segments based on waypoints; b) Partition area based on 3-Dimension features P1 and P2; c) grouping; and d) Measurement of cluster validity. The optimum partition is generated by calculating the minimum percentage of FIR. The results achieved are: i) there are five partitions, i.e: (n/2, n/3, n/4, n/5) and ii) optimal partition of each 3D, that is: for P1 was five partitions and the P2 feature was four partitions
Volume: 14
Issue: 3
Page: 1315-1329
Publish at: 2019-06-01

Out-of-school time STEM program: Students’ attitudes toward and career interests in mathematics and science

10.11591/ijere.v8i2.18702
Guan Saw , Brendan Swagerty , Shon Brewington , Chi-Ning Chang , Ryan Culbertson
Internationally, out-of-school time (OST) science, technology, engineering, and mathematics (STEM) programs abound. However, rigorous evidence of their impacts on student outcomes is scarce. This study evaluated the relationships between OST STEM program participation and student motivational factors in math and science by analyzing survey and administrative data of 1.017 middle school students who participated in the seven-week, STEM-focused Prefreshman Engineering Program (PREP) in San Antonio, Texas, from 2015 to 2017. Multiple regression results indicated that the PREP participation was positively associated with students’ attitudes toward math and interests in math-related careers, whereas the effects on students’ attitudes toward science and career interests in science were negligible. No evidence was found to suggest that the associations between PREP participation and student motivational factors in math and science differed by gender, race/ethnicity, or socioeconomic status.
Volume: 8
Issue: 2
Page: 356-362
Publish at: 2019-06-01

Proposal of a dynamic numerical approach in predicting flashover critical voltage

10.11591/ijpeds.v10.i2.pp602-610
Ali. A. Salem , R. Abd-Rahman , M. S. Kamarudin , H. Ahmad , N.A.M. Jamail , N.A. Othman , M.T. Ishak , M.N.R. Baharom , S. Al-Ameri
Glass insulators, due to its diverse characteristics, were used widely around the world for high voltage transmission lines. Surfaces of the insulators are exposed to high electrical, mechanical, and thermal stresses over the period of service. Accumulation of contamination distort stresses distribution along the insulators that may lead to flashover under severe condition. In this paper, Obenaus pollution model has been adopted to propose a dynamic mathematical modelling to determine flashover critical voltage with regard to parameters such as pollution conductivity, arc length, and width of layer of contamination on the surface of glass insulator. In addition, laboratory experimental works have been carried out according to IEC60305 to validate the results from numerical approach, which indicate a good agreement.
Volume: 10
Issue: 2
Page: 602-610
Publish at: 2019-06-01

The effect of students of sports management and coaching education department on entrepreneurial tendencies of career plans

10.11591/ijere.v8i2.16319
Mustafa Vural , Yaşar Çoruh
This study investigated the effect of career planning of the students in the Ağrı Ibrahim Çeçen University department of sports management and the coaching education department on entrepreneurial tendencies. The research group consisted of 161 students who studying in Ağrı Ibrahim Çeçen University Sports Management and Coaching Department. In the study, "Personal Career Planning Scale", which was developed by a researcher "Entrepreneurial Tendency Scale", which was developed by another researcher and "Personal Information Form", which was prepared by the researcher was used as a data collection tool. Spearman Correlation (r) coefficient technique was used to reveal the relationship between the career planning sub-dimensions and the entrepreneurial tendencies of the students. The effect between dependent and independent variables of the study was tested by regression analysis. In the correlation analysis performed at the end of the study, it was found that there was a positive relationship between all sub-dimensions of career planning scale and there was a positive and moderate relationship between the career planning and sub-dimensions and entrepreneurial tendencies. As a result of the regression analysis, the sub-dimension of defining opportunities and planning sub-dimension from the career planning has significantly affected the entrepreneurship and it explains 41% of the changes in entrepreneurship. It is possible to say that the participants who have the opportunities and have a plan are more entrepreneurs.
Volume: 8
Issue: 2
Page: 351-355
Publish at: 2019-06-01

Renewable energy integrated multi-terminal transmission system using wavelet based protection scheme

10.11591/ijpeds.v10.i2.pp995-1002
Savarapu Chandra Sekhar , G. Ravi Kumar , S.V.N.L Lalitha
The power plants behavior is crucial under faulted conditions and responses on protection systems. Major microgrid (MG) protection problem is the problem between the fault current in utilitygrid mode and microgrid mode. As conventional protection system doesn’t offer solution for all MG protection challenge, but it needs advanced protection strategy. Protection system must response to both the utilitygrid and MG faults. Fast response of protection is necessary as early as possible if the fault is occurs on utilitygrid and if the fault is occurs on MG, the protection scheme must seperate the small possible portion of MG to remove the fault. This work presents a typical MG protection scheme using digital relaying and satellite communication with wavelet detailed D1-coefficients of mother wavelet Bior 1.5. This research work is done for the detection, discrimination and locality of faults at distributed generators (DG’s) integration in multi-terminal transmission system. The algorithm tested under various faults with fault inception angles (FIA), fault impedances and fault distance of feeder line.
Volume: 10
Issue: 2
Page: 995-1002
Publish at: 2019-06-01

Cluster mechanism for hot data storage in HBase system

10.11591/ijeecs.v14.i3.pp1420-1424
Mohammad Musa Al-Momani
The evolution in different areas like e-business contributed to increase the number of data. So, a scalable database is required to accommodate a large number of data. Moreover, this data could be important and the number of accessing for reading or writing operations can make a pressure in some servers more than others, this pressure called unbalanced accessing. This will be achieved if a system that guarantees the distribution of this important data in useful form is used, because the pressure can causes a delay. Accordingly, when we design a multi storage node to keep this data, the pressure will transfer from a server to another. So, the proposed system searched for a satisfied solution to distribute all the users on the servers in a useful way to detect any mistake or repeating updating operation data by using identification feature. This method is applied on Hbase and called Clusterization.
Volume: 14
Issue: 3
Page: 1420-1424
Publish at: 2019-06-01

Motivation to learn and social support determine employability among vocational high school students

10.11591/ijere.v8i2.18188
Fatwa Tentama , Subardjo Subardjo , Muhamad Hasan Abdillah
One of the factors that influence the level of employability is the motivation to learn and social support. This study aims to determine the effect of motivation to learn and social support on student employability. The participants in this study were 255 students of class XII in State Vocational High School 1 Kalasan Yogyakarta, obtained through random cluster sampling. The data collection was carried out by using an employability scale, motivation to learn scale and social support scale. The data analysis used in this study was multiple linear regression analysis. Our data analysis shows that motivation to learn and social support have a very significant effect on employability, seen through the F test that obtained a score of 44.798 and a significance level (p) of 0.000 (p <0.01). In other words, the level of employability could be predicted based on students' level of motivation to learn and social support.
Volume: 8
Issue: 2
Page: 237-242
Publish at: 2019-06-01

Electrical and thermal efficiency of air-based photovoltaic thermal (PVT) systems: an overview

10.11591/ijeecs.v14.i3.pp1134-1140
Nurul Shahirah Binti Rukman , Ahmad Fudholi , Ivan Taslim , Merita Ayu Indrianti , Intan Noviantari Manyoe , Uce Lestari , Kamaruzzaman Sopian
The development of photovoltaic thermal (PVT) system is a very promising area of research. PVT systems using in various applications, such as solar drying, solar cooling, water heating, desalination, and pool heating. With the recognition of the potentials and contributions of PV system, considerable research has been conducted to attain the most advancement which may produce reliable and sustainable PVT system. The cooling system’s design refers to the absorber design which mostly focuses on water and air-based PVT systems. An air-based system has been developed through different absorber configurations, air flow modes and single- or double-pass design. Hence, a summarization on various research and development of air-based PVT system will be presented.
Volume: 14
Issue: 3
Page: 1134-1140
Publish at: 2019-06-01

Evaluation of mobile microwave radiation severity at al-door residential complex in Iraq

10.11591/ijeecs.v14.i3.pp1281-1285
Younes S. Alwan , Mohammad Sami Zidan , Mohammed Qasim Taha
In this paper, the electromagnetic radiation of the mobile microwave signals, propagated by the mobile towers in Al-Door Residential Complex west of Iraq, is measured and evaluated. This complex contains main nodes and hub repeaters and feeders to transmit the service to the whole Salahuddin and the northern provinces. Therefore, this paper focused on this area to assess the radiation and to assess the radiation whether it is safe for humans or exceeded the dangerous level. The area has been divided on to 19 locations where there are mobile towers and the radiation is measured in these locations. The electric field intensity is unsafe and should be improved since it exceeds the level of 1.7 V/m. However, the magnetic field intensity is acceptable according to the measurements. In general, the electromagnetic radiation density is unsafe since many readings override the level of 1.3 μW/〖cm〗^2. The standards of the radiation severity are based on the recommendations of LATNEX Corp.
Volume: 14
Issue: 3
Page: 1281-1285
Publish at: 2019-06-01

A nine-level hybrid current source inverter using common-emitter topology and inductor-cell

10.11591/ijpeds.v10.i2.pp852-859
Suroso Suroso , Daru Tri Nugroho , Toshihiko Noguchi
A different circuit structure of nine-level current source power inverter is presented and discussed in this manuscript. The proposed topology is based on the common-emitter inverter topology equipped with an inductor-cell circuit. The common-emitter inverter works as the main inverter circuits delivering a three-level AC current waveform. The inductor-cell circuit produces the intermediate output current levels for nine-level current output waveform. Proportional integral current controller was applied to regulate the current streaming thru the inductor-cell. Multi triangular carrier signals based sinusoidal pulse width modulation method was utilized to obtain a lower waveform distortion. The proposed nine-level inverter circuit was tested and examined. The test results verified that the new nine-level inverter circuit worked well producing a nine-level current waveform with less low-frequency harmonic components.
Volume: 10
Issue: 2
Page: 852-859
Publish at: 2019-06-01
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