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25,002 Article Results

Experimental Study Of SBPWM For Z-Source Inverter Five Phase

10.11591/ijpeds.v6.i1.pp45-55
Mohd Shafie Bakar , Nasrudin Abd. Rahim , Hamdan Daniyal , Kamarul Hawari Ghazali
On the basis of a conventional Z-source inverter, this paper presents an extension of the existing study about a driving scheme implementation of a simple boost pulse width modulation under open loop system for five phase two level system. The impact of design parameter (fixed modulation index and switching frequency) versus performance parameter (capacitor voltage, inductor current, total harmonic distortion and DC link voltage) are studied and analysed. To validate the advantages of Z-source five-phase inverter, the driving scheme are simulated using Matlab/Simulink and verified with real-time target board eZdspTM TMS320F28335. From the study, it was found that under specified modulation index and switching frequency, the THD of an output current fulfilled the EN61000-3-2 standard.
Volume: 6
Issue: 1
Page: 45-55
Publish at: 2015-03-01

Primary Science Teaching to Bicolano Students: In Bicol, English or Filipino?

10.11591/ijere.v4i1.4486
Jualim D. Vela
This study aimed to determine the effects of using the local and mother languages on primary students’ academic performance in science, which is officially taught in English. Using the official language, English, and the two local languages- Filipino, the national and official language, and Bicol, the mother language of the respondents- science lessons were developed and administered to three randomly grouped students.  After each science lesson, the researcher administered tests in three languages to the three groups of students to determine their comprehension of science lessons in the three languages.   The findings indicated that students who were taught using the Filipino language obtained better mean scores in the test compared to students who were taught using their mother language. On the other hand, students who were taught using the English language obtained the lowest mean scores.  Furthermore, the results revealed that the Bicol speaking students prefer the Filipino language during class discussions, recitations, in following their teacher’s instructions during science related classroom activities, and in doing their homework.
Volume: 4
Issue: 1
Page: 8-15
Publish at: 2015-03-01

A New Multilevel Active Power Filter Using Switches Meticulously Controlled

10.11591/ijpeds.v6.i1.pp168-177
Zoubir Zahzouh , Lakhdar Khochmane , Ali Haddouche
Shunt active power filter based on multilevel inverter is used to compensate the power factor and to delete the harmonics. This one permits to reduce the inverse voltages applied to the filter switches and their switching frequencies. Nevertheless, the high number of used switches requires a complicated controller and increases the switching losses; where the necessity of finding another resolution system. In this work a new topology of multilevel inverter is proposed as a shunt active power filter using two IGBT transistors in series of opposite sense meticulously controlled by a parallel control algorithm, with the concept of reduced number of six switches which are able to create five levels of the output voltage. This system substute the classical system of eight switches. The harmonic currents identification is carried out using the instantaneous active and reactive power method. The simulation is performed using Matlab/Simulink. The obtained results show that the filtering performances are well enhanced.
Volume: 6
Issue: 1
Page: 168-177
Publish at: 2015-03-01

Multi-Carrier based 27-level Hybrid Multi-level Inverter Interface with PhotoVoltaic

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/4226
P. Kiruthika , Ramani Kannan
This paper presents a Multi-Carrier Pulse Width Modulation control for a Single-phase 27-level Hybrid Multi-Level Inverter for photovoltaic systems. Multi-Carier Pulse Width Modulation technique uses a easy mapping to generate gate signals for the inverter.The Maximum Power Point Tracking is capable of extracting maximum power from PV array connected to each DC linkage voltage stage. The Maximum Power Point Tracking algorithm is solved by Perturb and Observer method.This is done to accomplish high energetic performance with low Total Harmonic Distortion.The grades are compared with conventional Multi-Level Inverter in terms of inferior THD is obtained and the 27-level Hybrid Muti-Level Inverter is simulated by using MATLAB/simulink.Simulated results are available to verify the usefulness and accuracy of the proposed method. This proposal can be easily extended to an n-level inverter for PV system. DOI: http://dx.doi.org/10.11591/telkomnika.v13i3.7140
Volume: 13
Issue: 3
Page: 467-475
Publish at: 2015-03-01

Clustering Fragments Metagenome Using Self-Organizing Map

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/4235
Yunita Fauzia Achmad , Wisnu Ananta Kusuma , Heru Sukoco
Metagenome is a combination of several microorganisms collected from the environment. In metagenome analysis, it is required binning for grouping metagenome fragment yielded by sequencer. This research used the composition approach for conducting metagenome fragment binning. In this approach, binning could be implemented using unsupervised or supervised learning. We used Self-Organizing Map (SOM) for conducting binning used on unsupervised learning. We compared two techniques of training in SOM, namely sequential training and batch training for finding the best techniques. The results showed that the batch training could obtain 3.8% error valued on the map of [10 15]. This error value is smaller than that of sequential training. DOI:  http://dx.doi.org/10.11591/telkomnika.v13i3.7115 
Volume: 13
Issue: 3
Page: 537-545
Publish at: 2015-03-01

The Switched Reluctance Electric Machine with Constructive Asymetry

10.11591/ijpeds.v6.i1.pp86-91
Alexander Petrushin , Maxim Tchavychalov , Ekaterina Miroshnichenko
Results of researches of forces of a unilateral attraction of a rotor to a stator of switched reluctance electric machines taking into account unevenness of an air gap are given. It is offered for configurations of magnetic systems with weak magnetic communication between the coils making a phase to carry out a supply of coils in parallel or independently from each other for reduction of not compensated forces of a unilateral attraction of a rotor to a stator.
Volume: 6
Issue: 1
Page: 86-91
Publish at: 2015-03-01

Socio-Economic Background and Access to Internet as Correlates of Students Achievement in Agricultural Science

10.11591/ijere.v4i1.4487
Sunday Paul Adegoke , Modupe M. Osokaya
This study investigated access to internet and socio-economic background as correlates of students’ achievement in Agricultural Science among selected Senior Secondary Schools Two Students in Ogbomoso South and North Local Government Areas. The study adopted multi-stage sampling technique. Simple random sampling was used to select thirty (30) students from each of the selected school in the two local governments. Stratified random sampling technique was used to select a sample of 300 students from various strata (school) chosen in the two local governments. Five research questions were answered. Descriptive Statistics, Pearson Moment Correlation and Multiple regressions were used to analyse the data gathered. The study observed that, 67.7% of the students have access to the internet (two-third of the sample). A positive but not significant relationship exists between access to internet and students’ achievement in Agricultural Science (r = 0.110 and p>0.05). There is a positive and significant relationship between socio-economic background and students’ achievement in Agricultural Science (r = 0.515** and p<0.01). Furthermore, relationship between socio-economic background and access to internet is not significant (r = 0.040 and p>0.05). Access to internet and socio-economic background are jointly related to students’ achievement in Agricultural Science. F (3,296) = 37.082, p<0.05, R value of .523ª, R ² of 2.73 and adjusted R square of .266.
Volume: 4
Issue: 1
Page: 16-21
Publish at: 2015-03-01

Enhancement of Power Quality by an Application FACTS Devices

10.11591/ijpeds.v6.i1.pp10-17
Prashant Kumar
The paper narrates widespread use of electrical energy by modern civilization has necessitated producing bulk electrical energy economically and efficiently. The Flexible AC Transmission system (FACTS) is a new technology based on power electronics, which offers an opportunity to enhance controllability, stability, and power transfer capability of AC transmission systems. Here SVC has been developed with the combination of TCSC and TCR. The paper contains simulation models of Thyristor controlled Series Capacitor (TCSC) and Thyristor controlled Reactor (TCR)-based Static VAR Compensator (SVC) which are the series and shunt Flexible AC Transmission Systems (FACTS) devices. The fact devices are designed by considering the line losses and their stability. The design and simulations of TCSC and TCR-based SVC shows the effectiveness of result using the MATLAB/Simulink. The designed system will try to reduce the voltage drops and electrical losses in the network without the possibility of transient especially in case of long transmission system. Student feedback indicates that this package is user-friendly and considerably effective for students and researchers to study theory of controlled reactor compensators, series capacitor compensator, and the reactive power control and voltage regulation.
Volume: 6
Issue: 1
Page: 10-17
Publish at: 2015-03-01

The Effectiveness of Facebook Group Discussions on Writing Performance: A Study in Matriculation College

10.11591/ijere.v4i1.4489
Ng Sau Ping , Mahendran Maniam
Matriculation a pre-tertiary program offered by Ministry of Education for students who have completed their ‘Sijil Pelajaran Malaysia’s’ (SPM) examinations successfully. These excellent students will be required to sit for the Malaysian University English Test (MUET) before pursuing their studies in local colleges and universities. MUET comprises all the four language skills of listening, speaking, reading and writing. However, matriculation students are still unable to perform well in MUET examination especially the writing component. Researcher aimed to see whether Facebook group discussions can be used as a medium to improve writing skills of students. The main purpose of this study is to look at the effectiveness of Facebook group discussion in writing performance and college students’ perception of using Facebook discussion. This study tested the effect of Facebook discussions by comparing 2 groups of learners (a control group and an experimental group) on writing tasks. The scores of Pre and Post test for both groups will be compared after treatment method of Facebook group discussion on the experimental group. Learners’ attitudes towards the usage of Facebook group discussion and aspects of Facebook that help students to express their opinion. Discussions of the findings will include suggestions on whether Facebook discussions can be used to improve writing performance.
Volume: 4
Issue: 1
Page: 30-37
Publish at: 2015-03-01

Correlation between Teacher’s PCK (Pedagogical Content Knowledge) and Student’s Motivation in Primary School in Indonesia

10.11591/ijere.v4i1.4490
Ika Maryani , Sri Tutur Martaningsih
Various learning problems occur due to the teachers’ inability in managing the learning process. Teacher’s learning skill is influenced by their understanding in the curriculum components which are including pedagogical knowledge and content knowledge. The aims of this research were to determine: 1) the condition of Pedagogical Content Knowledge (PCK) of primary school teachers; and 2) the relationship between the teacher’s PCK with student’s motivation in learning. The experiment was conducted on teachers and primary school students in Yogyakarta, Indonesia. Teacher samples were taken by purposive sampling technique, whereas the student samples were taken by random sampling technique. The data of students’ motivation were collected through questionnaire, whereas data of PCK obtained from the results of teachers’ competency test in the last 2013. Data were analyzed using Pearson correlation technique. The results showed there is a relationship between teacher’s pedagogical content knowledge with student motivation in learning (p value is 0.000, and r is 0.0907).
Volume: 4
Issue: 1
Page: 38-44
Publish at: 2015-03-01

Making Humanoid Robots More Acceptable Based on the Study of Robot Characters in Animation

10.11591/ijra.v4i1.pp63-72
Fatemeh Maleki , Zeinab Farhoudi
In this paper we take an approach in Humanoid Robots are not considered as robots who resembles human beings in a realistic way of appearance and act but as robots who act and react like human that make them more believable by people. Regarding this approach we will study robot characters in animation movies and discuss what makes some of them to be accepted just like a moving body and what makes some other robot characters to be believable as a living human. The goal of this paper is to create a rule set that describes friendly, socially acceptable, kind, cute... robots and in this study we will review example robots in popular animated movies. The extracted rules and features can be used for making real robots more acceptable.
Volume: 4
Issue: 1
Page: 63-72
Publish at: 2015-03-01

Leader-Follower Tracking System for Agricultural Vehicles: Fusion of Laser and Odometry Positioning Using Extended Kalman Filter

10.11591/ijra.v4i1.pp1-18
Zhang Lin Huan , Takigawa Tomohiro , Ahamed Tofael
The aim of this research was to develop a safe human-driven and autonomous leader-follower tracking system for an autonomous tractor. To enable the tracking system, a laser range finder (LRF)-based landmark detection system was designed to observe the relative position between a leader and a follower used in agricultural operations. The virtual follower-based formation-tracking algorithm was developed to minimize tracking errors and ensure safety. An extended Kalman filter (EKF) was implemented for fusing LRF and odometry position to ensure stability of tracking in noisy farmland conditions. Simulations were conducted for tracking the leader in small and large sinusoidal curved paths. Simulated results verified high accuracy of formation tracking, stable velocity, and regulated steering angle of the follower. The tracking method confirmed the follower could follow the leader with a required formation safely and steadily in noisy conditions. The EKF helped to improve observation accuracy, velocity, and steering angle stability of the follower. As a result of the improved accuracy of observation and motion action, the tracking performance for lateral, longitudinal, and heading were also improved after the EKF was implemented in the tracking system.
Volume: 4
Issue: 1
Page: 1-18
Publish at: 2015-03-01

Relationship Domain of Form Six Teachers Thinking in Teaching with External Factors of Form Six Teachers

10.11591/ijere.v4i1.4485
Mokhtar bin Pet , Ahmad Johari Hj Sihes
This study aimed to examine the external factors of form six teachers who can influence thinking domain form six teachers in their teaching. This study was conducted using a quantitative approach using questionnaires. A total of 300 form six teacher schools in Johor were chosen as respondents. The findings were obtained as student background factors are the most important factors that influence the thinking domain of form six teachers with a mean value of 4.54 and the domain of thinking is that teachers' expectations domain is the most important with the 4:54. Relation to external factors form six teachers with thinking domain form six teachers in the teaching of significant positive classroom atmosphere factors with r = .524, school goals with r = .405, needs of students with r = .454 and students background with r = .423. This study will help the Ministry of Education to raise the standards of form six education.  
Volume: 4
Issue: 1
Page: 1-7
Publish at: 2015-03-01

The Control Design of Ship Formation with the Presence of a Leader

10.11591/ijra.v4i1.pp53-62
M. Miswanto , I. Pranoto , H. Muhammad Mhammad , D. Mahayana
Formation control is an important behavior for multi-agents system (swarm). This paper addresses the optimal tracking control problem for swarm whose agents are ships moving together in a specific geometry formation. We study formation control of the swarm model which consists of three agents and one agent has a role as a leader. The agents of swarm are moving to follow the leader path. First, we design the control of the leader with Pontryagin Maximum Principle. The control of the leader is designed for tracking the desired path. We show that the tracking error of the path of the leader tracing a desired path is sufficiently small. After that, geometry approach is used to design the control of the other. We show that the positioning and the orientation of each agent can be controlled dependent on the leader. The simulation results show to illustrate of this method at the last section of this paper.
Volume: 4
Issue: 1
Page: 53-62
Publish at: 2015-03-01

Analysis and Design of Tag Antenna Based UHF RFID for Libraries

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/4233
Xue Jian-bin , He Fengjie , Wang Dong
A kind of UHF RFID tag antenna for library management is designed. The series of design requirements are proposed through rich analytics. Refer to the management model of intelligent library based on UHF RFID. For the antenna, the size is , adopting T-shaped matching which good for adjusting of antenna impedance matching, the center frequency by simulations isunder application environment, Return Loss is less than in the frequency band of , the minimum value of return loss is . Simulation results show that the tag antenna has a good performance under application environment for library. DOI: http://dx.doi.org/10.11591/telkomnika.v13i3.7135 
Volume: 13
Issue: 3
Page: 521-528
Publish at: 2015-03-01
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