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28,593 Article Results

A Monitoring System of Battery LiFePO4 for Assessment Stand-Alone Street Light Photovoltaic System Based on LabVIEW Interface for Arduino

10.11591/ijpeds.v8.i2.pp926-934
Anif Jamaluddin , Anafi Nur’aini , Arif Jumari , Agus Purwanto
The paper presents monitoring and assessment system of battery LiFePO4 performance that applied on a stand-alone photovoltaic system. A stand-alone photovoltaic system is constructed by photovoltaic module 50 Watt Peak, Pulse Width Modulation solar controller, battery module LiFePO4 battery (12 Volt 21 Ah), and street light 10 watt. To overcome the data acquisition, a simple monitoring system has been designed using LabVIEW Interface for Arduino. The voltage divider, current sensing type ACS712, temperature and humidity sensor, and light intensity sensor were used to collect the data. The data processed by a dual microcontroller (ATmega-2560 and ATmega-328) and LabVIEW software on Personal Computer. The assessment of stand-alone photovoltaic system includes battery LiFePO4 performance (State of Charge, voltage, and current) during charging and discharge condition, the power efficiency, and environmental condition (temperature, humidity and solar radiation). In the discharge condition, voltage battery and State of Charge decreased about 40% after 12 hours operated. In the charge condition, the current battery fluctuated in the range of 0.10 A-1.95 A and the State of Charge increased up to 25% after 8 hours operated. It indicates that the power of the battery has always lacked.
Volume: 8
Issue: 2
Page: 926-934
Publish at: 2017-06-01

Teaching New Vocabulary to Iranian Young FL Learners: Using Two Methods Total Physical Response and Keyword Method

10.11591/ijere.v6i2.7593
Amir Toghyani Khorasgani
Early language learning for children is increasingly common, and the majority of parents and the public do not see it as superfluous or overburdening children. Moreover, teaching a foreign language to very young children has been an increasingly dominant trend in most globalized societies. While there is abundant literature that supports teaching a foreign language at an early age through language immersion programs, little is known about the efficiency of strategies used to explicitly teach new vocabulary words in a foreign language to young learners. This empirical investigation aimed to assess and compare the efficiency of two mnemonics that have been traditionally used to explicitly teach new foreign language words: the Keyword Method (KWM) and the Total Physical Response (TPR). Results indicate that the KWM is more effective than TPR in teaching new vocabulary words in a foreign language to early elementary school children.
Volume: 6
Issue: 2
Page: 150-156
Publish at: 2017-06-01

Speed and Position Estimator of Dual-PMSM for Independent Control Drives using Five-Leg Inverter

10.11591/ijpeds.v8.i2.pp612-622
Jurifa Mat Lazi , Zulkifilie Ibrahim , MD Hairul Talib , Auzani Jidin , Tole Sutikno
Nowadays, A lot of industry requires Multi Motor System (MMS) applications such as propulsion and traction power, HEV, conveyer and air-conditioner. The Conventional arrangement for MMS usually done by cascading the motors drives which each drives has individual inverter. Part of MMS, Dual-Motor drives fed by a single inverter is being paid attention by the researchers. Dual-motor drives using a single three-leg inverter has its limitation in the case of different operating conditions and independent speed control requirement. Therefore, dual-Motor drives using a single Five-leg Inverter (FLI) was proposed for independent control for both motors. In PMSM drives, the information of the feedback speed and rotor angular position is compulsory for variable speed drives. Conventional solution is by using speed sensor which will increase size, cost, extra hardwire and feedback devices, especially for the case of dual-PMSM drives. The best solution to overcome this problem is by eliminating the usage of speed and position sensors for Dual-motor drives. This paper presents a new sensorless strategy using speed and position estimator for Independent Dual- Permanent Magnet Synchronous Machine (PMSM) drives which utilize Five-Leg Inverter (FLI). The proposed strategy is simulated using MATLAB/Simulink to evaluate the overall motor drive performance. Meanwhile the experimental set-up is connected to dSPACE 1103 Board. The experimental results demonstrate that the proposed estimator is successfully managed to control the Dual-PMSM drives for variation of speed and for different direction applications.
Volume: 8
Issue: 2
Page: 612-622
Publish at: 2017-06-01

Performance Analysis of Modified SVPWM Strategies for Three Phase Cascaded Multi-level Inverter fed Induction Motor Drive

10.11591/ijpeds.v8.i2.pp835-843
Ravikumar Bhukya , P. Satish Kumar
This paper presents new modified space vector pulse width modulation techniques (Phase disposition-Space vector pulse width modulation, Alternative Phase Opposition disposition- Space vector pulse width modulation and Phase Opposition disposition-Space vector pulse width modulation) are analyzed for three-phase cascaded multi-level inverter fed induction motor from the point of view of the Phase voltages, line voltage, stator current,speed,torque and Total harmonic distortion.in the proposed modified technique the reference signals are generated by adding offset voltage to the reference phase voltages.This modified SVPWM technique does not involve region indentification,sector identification for switching vector determination as are required in the conventional multi level SVPWM technique,it is also reduces the computation time compared to the conventional space vector PWM technique.The necessary calculations for generation of new modified SVPWM for the modulation strategies have presented in detail.  It is observed that the modified SVPWM modulation ensures excellent, close to optimized pulse distribution results and THD is compared to for five-level, seven-level, nine-level and eleven-level Cascaded H-Bride Multi-level Inverter fed to Induction motor. Theoretical investigations were confirmed by the digital simulations using MATLAB/SIMULINK software.
Volume: 8
Issue: 2
Page: 835-843
Publish at: 2017-06-01

Idiosyncratic Shocks, Child Labor and School Attendance in Indonesia

10.11591/ijere.v6i2.7588
Bayu Kharisma
This paper investigates the effect of various idiosyncratic shocks against child labor, child labor hour and school attendance. Also, the role of the assets held by households as one of the coping strategies to mitigate the effects of shocks. The results show that various idiosyncratic shocks that encourage child labor is generally caused by crop loss, a disease suffered by the head or member of the household, a decrease in household income due to lower prices and the quantity produced and the death of the head or a family member. This indicates that households are not sheltered from the idiosyncratic shocks and restricted access to formal and informal institutions. Other findings show a variety of idiosyncratic shocks does not affect child labor hour and the school attendance. Additionally, household assets play an important role in reducing the number of child labor and increase school attendance but do not affect the child labor hour during a variety of idiosyncratic shocks.
Volume: 6
Issue: 2
Page: 100-109
Publish at: 2017-06-01

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

Neural Network Controller for Power Electronics Circuits

10.11591/ijai.v6.i2.pp49-55
K.J. Rathi , M. S. Ali
Artificial Intelligence (AI) techniques, particularly the neural networks, are recently having significant impact on power electronics. This paper explores the perspective of neural network applications in the intelligent control for power electronics circuits. The Neural Network Controller (NNC) is designed to track the output voltage and to improve the performance of power electronics circuits. The controller is designed and simulated using MATLAB-SIMULINK
Volume: 6
Issue: 2
Page: 49-55
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

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
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