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29,082 Article Results

Improved Fully Differential Low Power Active Filter

10.11591/ijpeds.v8.i2.pp747-754
Imane Halkhams , Mahmoud Mehdi , Said Mazer , Moulhime El Bekkali , Wafae El Hamdani
This paper relates the new topology and simulations of a fully differential CMOS active filter for mm wave band applications. The advantages of the differential topology over the single ended one are discussed and the quality factor is tuned to insure application requirements, including narrow bandwidth and high selectivity due to a differential negative resistance that reuses the filter’s current. Using this topology enables independent tuning of the quality factor and low power consumption while compensating the resistive loss of the filter. Very high filter performance was obtained with the simulated active inductor based active filter that was designed using CMOS 0.35 µm technology from AMS foundry and that resonates at 30 GHz with a high quality factor of Q > 500.
Volume: 8
Issue: 2
Page: 747-754
Publish at: 2017-06-01

Adolescent Students and Their Experiences of Dealing with Pregnancy: A Mixed-Method Study in Public Schools from Central Mexico

10.11591/ijere.v6i2.7586
Erika E Atienzo , Lourdes Campero , Erendira Marin , Guillermo Gonzalez
In impoverished communities in Mexico, most adolescent mothers do not attend school; but typically, they become pregnant once they dropped out. Understanding the experiences of adolescents who have had a pregnancy and continue in school is complicated since few manage to do it. The goal of this study is to describe experiences within the family and school context and plans for the future of a sample of Mexican students who have had a pregnancy. We analyze information from the questionnaires of 68 women and 44 men and interviews to 6 women and 5 men. First intercourse was at age 15 and first pregnancy at 16; 39% of men and 57% of women already have a child; 54% of men and 19% of women work and study simultaneously. Dropping out because of a pregnancy/marriage was reported by 41% of women and 14% of men. The support of family and teachers is crucial to stay in school; but the institution remains indifferent to their plight. The immediate needs easily defeat their aspirations. It is fundamental to acknowledge and notice the experiences of these vulnerable young people in order to design focused strategies promoting their success in adult life.
Volume: 6
Issue: 2
Page: 88-99
Publish at: 2017-06-01

Gamified Android-Based Academic Information System

10.11591/ijere.v6i2.7595
Henry Setiana , Seng Hansun
Student is often lazy when it comes to studying, and how to motivate student was one of the problem in the educational world. To overcome the matters, we will implement the gamification method into an Academic Information System. Academic Information System is a software used for providing information and arranging administration which connected with academic activities. By implementing the gamification method, it is expected to improve student’s interest on the study programs. Gamification itself is a process with the purpose of changing non-game context into a more interesting application by integrating game thinking, game design, and game mechanics. From the evaluation result, it is concluded that the application has been successfully built and the gamification method has been successfully implemented to improve student’s interest and the most influential gamification features are point and reward.
Volume: 6
Issue: 2
Page: 164-173
Publish at: 2017-06-01

Shunt Active Filter Based on Radial Basis Function Neural Network and p-q Power Theory

10.11591/ijpeds.v8.i2.pp667-676
Prakash Ch. Tah , Anup K. Panda , Bibhu P. Panigrahi
In this paper a new combination Radial Basis Function Neural Network and p-q Power Theory (RBFNN-PQ) proposed to control shunt active power filters (SAPF). The recommended system has better specifications in comparison with other control methods. In the proposed combination an RBF neural network is employed to extract compensation reference current when supply voltages are distorted and/or unbalance sinusoidal. In order to make the employed model much simpler and tighter an adaptive algorithm for RBF network is proposed. The proposed RBFNN filtering algorithm is based on efficient  training methods called hybrid learning method.The method  requires a small size network, very robust, and the proposed algorithms are very effective. Extensive simulations are carried out with PI as well as RBFNN controller for p-q control strategies by considering different voltage conditions and adequate results were presented.
Volume: 8
Issue: 2
Page: 667-676
Publish at: 2017-06-01

A Method of Extended Jacobian and Firefly Algorithm for the Kinematic Analysis of Planar Robots

10.11591/ijra.v6i2.pp141-150
T. Raja Prathab , R. Suja Mani Malar , T. Ahilan
Planar robots are one of the optimal robot form impacted in typical Cartesian plane. It consists of fixed divisions and connectors positioned in series which offers like working of human arm. The one end of robot arm position is fixed and the other arm of the robot move through the Cartesian plane by modifying the framework of arm joints. The kinematic analysis on planar robot includes position, velocity and acceleration are validated not by considering the force which cause motion to robot. The manipulator with lack of design and fault tolerant operation is analytical for application in remote and threat environment where periodic maintenance and improvements are not available. The most advanced architecture and operational flexibility of robots offer new probability and advancement in a large scale of fabrication process. This paper proposes inverse kinematic analysis of PUMA 560 robotic arm to conclude long range of fault tolerance. The proposed work incorporates Jacobian and Firefly algorithm are generally useful for determining inverse kinematics for redundant robots.
Volume: 6
Issue: 2
Page: 141-150
Publish at: 2017-06-01

Science Teachers’ Opinions on Application of Competency-Based Science Model Components to Science Programs

10.11591/ijere.v6i2.7590
Suleyman Yaman
The aim of this study is to reveal the opinions of teachers, who gave the science lessons that took effect in Turkey in 2004 and 2013, on the sub-components of the programs and to identify to what extent the objectives of the program have been achieved. In total 89 teachers, out of which 42 were females and 47 were males, in the study which was conducted by the semi-structured interview method. Data collected from the study, where five questions were asked to teachers, was settled by analyzing the science programs according to components of the Ohio Competency Based Science Model. While result from the study shows that the teachers were qualified to ensure the development of some behaviors that were expected to be seen on the students as a result of science programs; especially the students gave a lower level of positive opinion about the components related with how they will use this data. In addition; while the teachers supported that the scientific process skills, are one of the basic elements of science programs, were sufficient for the gain of basic skills, they stated that they are not sufficient for the gain of some causal and experimental skills.
Volume: 6
Issue: 2
Page: 118-127
Publish at: 2017-06-01

Optimal Feature Selection Technique for Mel Frequency Cepstral Coefficient Feature Extraction in Classifying Infant Cry with Asphyxia

10.11591/ijeecs.v6.i3.pp646-655
A. Zabidi , W. Mansor , Khuan Y. Lee
Mel Frequency Cepstral Coefficient is an efficient feature representation method for extracting human-audible audio signals. However, its representation of features is large and redundant. Therefore, feature selection is required to select the optimal subset of Mel Frequency Cepstral Coefficient features. The performance of two types of feature selection techniques; Orthogonal Least Squares and F-ratio for selecting Mel Frequency Cepstral Coefficient features of infant cry with asphyxia was examined. OLS selects the feature subset based on their contribution to the reduction of error, while F-Ratio selects them according to their discriminative abilities. The feature selection techniques were combined with Multilayer Perceptron to distinguish between asphyxiated infant cry and normal cry signals. The performance of the feature selection methods was examined by analysing the Multilayer Perceptron classification accuracy resulted from the combination of the feature selection techniques and Multilayer Perceptron. The results indicate that Orthogonal Least Squares is the most suitable feature selection method in classifying infant cry with asphyxia since it produces the highest classification accuracy.
Volume: 6
Issue: 3
Page: 646-655
Publish at: 2017-06-01

An Active Virtual Impedance Control Algorithm for Collision Free Navigation of a Mobile a Robot

10.11591/ijra.v6i2.pp99-111
Jinho Kim , Jangmyung Lee
An modified active virtual impedance control has been proposed for collision free navigation of a mobile robot to avoid front obstacles dynamically while a mobile robot is following a sound source. A mobile robot is controlled to follow a sound source with a velocity which is determined by virtual repulsive and attraction forces to avoid obstacles and to follow the sound source, respectively. To generate the virtual repulsive and attraction forces, a new modified virtual impedance is defined as a function of the distances and relative velocities to the sound source and obstacles from the mobile robot. In the conventional virtual impedance method, fixed coefficients have been used for the virtual impedance control. In this research, the coefficients are dynamically adjusted to elaborate the obstacle avoidance performance in various situations such as the multiple moving obstacles environment. A microphone array consisting of three microphones in a row has been attached on the mobile robot to detect the relative distance and velocity to the obstacles. The relative position and orientation of the sound source against the mobile robot has been estimated using the geometrical relationship of the microphones. As an application, the mobile robot can be used as a pet robot following the master with a sound source. The effectiveness of the proposed algorithm has been demonstrated through real experiments.
Volume: 6
Issue: 2
Page: 99-111
Publish at: 2017-06-01

Format of Options in a Multiple Choice Test Vis-a-Vis Test Performance

10.11591/ijere.v6i2.7594
Hermabeth O. Bendulo , Erlinda D Tibus , Rhodora A Bande , Voltaire Q Oyzon , Myrna L Macalinao , Norberto E Milla
Testing or evaluation in an educational context is primarily used to measure or evaluate and authenticate the academic readiness, learning advancement, acquisition of skills, or instructional needs of learners. This study tried to determine whether the varied combinations of arrangements of options and letter cases in a Multiple-Choice Test (MCT) affect the test performance of the homogenous BEED students. A test was designed and administered to test the performance across test items employing different arrangement of options (Cascading, Inverted N, Z eye movement, and One-line Horizontal) and across case of letter options (upper and lower case), that is, a total of eight (8) treatments. The statistical analyses revealed that there is an insignificant difference in the mean performance of students in relation to letter cases and arrangement of letter choices in a multiple choice test. Thus, the test performance of students in a multiple choice type of test does not depend on either letter cases or arrangement of letter choices.
Volume: 6
Issue: 2
Page: 157-163
Publish at: 2017-06-01

Delta Parallel Robot Based on Crank-Slider Mechanism

10.11591/ijra.v6i2.pp112-120
Zhe Qin , Xiao-Chu Liu , Zhuan Zhao
A three-degree-of-freedom Delta parallel manipulator driven by a crank-slider mechanism is proposed. In Cartesian space, a gate-shaped curve is taken as the path of the pick-and-place operation, combining with the inverse kinematics theory of the Delta robot, and a mathematical model of robot statia force transmission is established. The force and the output torque of the robot-driven joint are taken as the main performance indexes, and the value of the crank-slider mechanism applied to Delta robot is further measured. The simulation results show that the delta robot driven by the crank slider mechanism can reduce the force and output torque of the driving joint during the picking and discharging operation, and has good practical application value.
Volume: 6
Issue: 2
Page: 112-120
Publish at: 2017-06-01

Multi-output Portable Universal Power Supply Kit with Plug-and-Use Equipment for Emergency Application

10.11591/ijeecs.v6.i3.pp497-503
A. Nazifah Abdullah , M. Asri Jusoh , Norkharziana Mohd Nayan , M. Syahril , N. Nadiah Ayop
This paper presents design and analysis of Multi-output Portable Universal Power Supply Kit (EPS Kit). This EPS Kit is intended as an alternative power supply kit to reduce the issue of a power outage. Lead Acid Battery which is considered one of the easiest sources that can be found during an emergency state is the best alternative energy source. The EPS Kit is designed to store the power in Lead Acid Battery as the main source and powered by the solar energy as the secondary source and will be providing both standard household alternating current (AC) and most common direct current (DC) power. This Kit is a stand-alone system comes with plug-and-use kit in which the system can be recharged using solar and AC power. The plug-and-use kit is equipped with intelligent multi-USB ports, adjustable dual mode NiCd, Ni-Mh, and Li-Ion battery which are Discharge/Charger mode, AC output port, LED lamp, and emergency electrical accessories. EPS Kit is also portable which installed with wheel and handle for mobility application. Production of EPS Kit is involved software and hardware. The software used are 3D CAD design software and circuit simulation software respectively for preliminary 3D drawing design and output circuit validation. Experimental results of the EPS Kit load testing, charging and discharging state are conducted in order to demonstrate the EPS Kit functionality and usage.
Volume: 6
Issue: 3
Page: 497-503
Publish at: 2017-06-01

Trend of De La Salle Lipa Education Graduates’ Performance in the Licensure Examination for Teachers (LET) from 2011 to 2015

10.11591/ijere.v6i2.7592
Maria Theresa Bolo Kalaw
This study aimed to examine the trend of performance of De La Salle Lipa (DLSL) education graduates in the Licensure Examination for Teachers (LET). Quantitative trend analysis employed on the data collected from records officially released by the Professional Regulation Commission (PRC) for the years 2011 to 2015 revealed that the performance of both elementary and secondary education passers were significantly higher than the national passing rates and showed a significant relationship between the graduates’ English proficiency and their LET- General Education performance. When grouped according to their profile, there were significant differences in the education graduates’ performance in terms of the year LET was taken, their GPA, and results of English Proficiency and Culture Fair Intelligence Tests but not in terms of their field of specialization. These results were considered in proposing a syllabus incorporating the strategies to further improve the program offerings of the Education Department particularly in terms of curriculum development, recruitment and selection of qualified students, continuous professional training for faculty, and more intensified LET review for the education graduates. Findings of the study showed that DLSL is eligible to qualify as a Center of Development in Teacher Education in the area of instructional quality.
Volume: 6
Issue: 2
Page: 138-149
Publish at: 2017-06-01

Designing of Robot Gamelan Music using ATmega 16 Microcontroller

10.11591/ijra.v6i2.pp121-130
Handri Jir Azhar , Ferry Hadary , Syaifurrahman Syaifurrahman
This paper presents a robot concept which is the robot can play the instrumental Gamelan music. Gamelan is a percussive instrument. Instrumental Gamelan music keys are consist of 2 octaves in 15 tones. Robot Gamelan music is using proportional-derivative (PD) control system. PD control of the robot is by controlling DC gear motor position to desired Gamelan key position. Robot Gamelan music using ATmega 16 microcontroller as a controller. Feedback of PD control is using magnetic rotary encoder (MRE) sensor. PD control is using the constant. The constant functions of PD control are determining the pulse width modulation (PWM) toward DC gear motor velocity in order to reposition a gamelan key position and pushing down the errors.
Volume: 6
Issue: 2
Page: 121-130
Publish at: 2017-06-01

Aging Detection of Glass Disc Insulator by using Infrared Camera

10.11591/ijeecs.v6.i3.pp520-527
Mohammed Imran Mousa , Zulkurnain Abdul-Malek , Zainab Imran Mousa
Suitable diagnostic techniques for outdoor glass insulators are important for ensuring the reliablilty and stability of power system. The possibility of insulator flash-over increases, especially when the insulator is covered by pollution layers or has an internal defect. In this paper, a new technique to detect the pollution level and invisible damage by measuring the surface temperature of glass disc insulators is proposed. A high definition camera had been used to determine the surface temperatures of four glass insulators. The effects of applied voltage on the surface temperature and its distribution were studied. The results show the possibility of using the infrarad camera to detect the aging level and invisible damages of the glass insulators.
Volume: 6
Issue: 3
Page: 520-527
Publish at: 2017-06-01

Assessment of the Ethical Orientations of Turkish Teachers

10.11591/ijere.v6i2.6339
Ozlem Ural , Soheyda Gokturk , Oguzhan Bozoglu
Students’ development in terms of values, moral education and character is crucial for the culture of any society. Considering that these are gained through family and school, school principals and teachers can be the key players.  Even if teachers do not deliberately act as models or ethic agents, or their main purpose is not merely ethical education, they still affect the students directly and indirectly. Therefore, exploration of their ethical decisions and what orientations guide them in making those ethical decisions is highly important. In this regard, teachers’ ethical orientation is worth measuring. In this study, Ethical Position Questionnaire [1], which has so far been commonly used to explore ethical orientations of a variety of professionals and cultural groups was translated into Turkish; and validity and reliability study was applied on teachers. Research group consisted of 251 primary school teachers working in state schools located in Kocaeli province, Turkey. To identify the construct validity of Ethical Position Questionnaire (EPQ), factor analysis was conducted. The analysis revealed that EPQ is two factor-structured and these factors explain 45% of the variance. Cronbach’s Alpha internal consistency reliability assessed for the total items of Turkish version of EPQ was .81 and for the first subscale –idealism-, for the second scale –relativism- was found .84 and .86 respectively. In conclusion, The Turkish version of Ethical Position Questionnaire was identified as a valid and reliable research tool to assess ethical positions of primary school teachers.
Volume: 6
Issue: 2
Page: 183-188
Publish at: 2017-06-01
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