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30,376 Article Results

Teachers' Obstacles in Implementing Numbered Head Together in Social Science Learning

10.11591/ijere.v7i1.11625
Harini Widyaningtyas , Retno Winarni , Tri Murwaningsih
This study is aimed at describing teachers’ obstacles in applying Numbered Head Together learning model in social science learning. The type of research is qualitative descriptive. The subject of the research is the third-grade teacher of elementary school in Sukoharjo Sub-district. The findings of the research were analyzed using interactive analysis of Miles and Huberman and were presented through descriptive narrative technique. The results reveal several obstacles that were experienced by the teachers. First, the time is limited. Second, the classroom atmosphere is noisy due to large number of students. Third, the number of students in total is not even. Fourth, the students interfere each other. Fifth, not all of the students work in the group. Sixth, the students are not actively responding. Seventh, the students are lack of confidence in the presentation.
Volume: 7
Issue: 1
Page: 25-31
Publish at: 2018-03-01

An Intelligent Controller Design Approach for MIMO Coupled Tank System

10.11591/ijra.v7i1.pp8-17
Mohd Hafiz Jali , Ahmad Firdaus Azhar , Rozaimi Ghazali , Chong Chee Soon
Nowadays, versatilities of controllers have been developed to control the Coupled Tank System (CTS) such as proportional, integral, derivative (PID), fuzzy, fuzzy PID and neuro network. This paper focused on the control of the pump flow rate, in and out of the tank against the cross-sectional area of the CTS’s tank. The main objective of this paper is to design a CTS by using MATLAB since the Fuzzy Logic Controller (FLC) is widely utilized in the control of engineering applications in the industrial. Therefore, the FLC will be utilized to control and improve the performance of the CTS. The conventional PID controller will be applied, which reacts as a benchmark in the performance of the FLC. Parameters such as steady state error, settling time, and maximum overshoot will be part of the simulation results. As a result of the dynamic response executed in the closed-loop environment, it can be concluded that the FLC is capable of performing better than the conventional PID controller.
Volume: 7
Issue: 1
Page: 8-17
Publish at: 2018-03-01

Harmonic Analysis of Three-phase Fixed Capacitor–thyristor Controlled Reactor under Balanced and Unbalanced Conditions

10.11591/ijra.v7i1.pp67-76
Jayababu Badugu , Y. P.Obulesu , Ch. Saibabu
Three-phase Fixed Capacitor Thyristor Controlled Reactor is widely used for reactive power compensation in power systems because of reduced cost and high reliability.  The problem with FC-TCR is that to generate current harmonics when it is partially conducting. When this harmonic current is interacted with system impedance, voltage waveform will distorted. This harmonic pollution is undesirable in power systems. Therefore, it is important to know the harmonic behaviour of three-phase FC-TCR before they can be used in a power system network. This paper presents the harmonic analysis of three-phase FC-TCR operating under balanced and unbalanced conditions. This analysis is useful to design the harmonic filter to reduce the harmonic pollution in power systems.The proposed work is implemented in MATLAB environment.
Volume: 7
Issue: 1
Page: 67-76
Publish at: 2018-03-01

An Actor-critic Algorithm Using Cross Evaluation of Value Functions

10.11591/ijra.v7i1.pp39-47
Hui Wang , Peng Zhang , Quan Liu
In order to overcome the difficulty of learning a global optimal policy caused by maximization bias in a continuous space, an actor-critic algorithm for cross evaluation of double value function is proposed. Two independent value functions make the critique closer to the real value function. And the actor is guided by a crossover function to choose its optimal actions. Cross evaluation of value functions avoids the policy jitter phenomenon behaved by greedy optimization methods in continuous spaces. The algorithm is more robust than CACLA learning algorithm, and the experimental results show that our algorithm is smoother and the stability of policy is improved obviously under the condition that the computation remains almost unchanged.
Volume: 7
Issue: 1
Page: 39-47
Publish at: 2018-03-01

Effect of Integrated Feedback on Classroom Climate of Secondary School Teachers

10.11591/ijere.v7i1.11146
Nilesh Kumar Patel
This study aimed at finding out the effect of Integrated feedback on Classroom climate of secondary school teachers. This research is experimental in nature. Non-equivalent control group design suggested by Stanley and Campbell (1963) was used for the experiment. Integrated feedback was treatment and independent variable, Classroom climate was dependent variable and pre- Classroom climate, and Intelligence were considered as covariates. The sample of the study comprised of 77 secondary school teachers and 220 students studying in secondary classes from purposively selected four schools of Indore city. The data for Classroom climate, Job satisfaction and Intelligence were collected through standardized tools. One-way ANCOVA and 2X2 factorial design ANCOVA were used for data analysis. Hypotheses were tasted at level of significance with α = 0.05. It was found that the treatment has significant effect over Classroom climate when pre- Classroom climate was taken as covariate. The results also shown that Classroom climate was independent of the treatment when Intelligence and pre- Classroom climate were separately considered as covariates. In addition, classroom climate was also found independent of interaction between feedback and intelligence when pre – Classroom climate was taken as covariate.
Volume: 7
Issue: 1
Page: 65-71
Publish at: 2018-03-01

Incursion Recognition Mechanism Based on Secure Network System

10.11591/ijeecs.v9.i3.pp543-545
A. Mohamed Divan Masood , S. K. Muthusundar
Internet based computing dissimilar services such as server storage and applications are shared on the internet. This makes cloud computing one of the most promising and rapidly growing technologies. As it relies on sharing computer resources, it is prone to various security risks. Individual such security issue is Distributed Denial of Services attack on cloud. A DDos assault can begin from anyplace in the system and normally overpowers the casualty server by sending countless. This paper deals with the prevention of DDos attacks and how honey pot approach can be used in cloud computing to counter DDos attacks.
Volume: 9
Issue: 3
Page: 543-545
Publish at: 2018-03-01

Exploration Strategies of Coordinated Multi-Robot System: A Comparative Study

10.11591/ijra.v7i1.pp48-58
Ayman. El shenawy , Khalil. Mohamed , Hany. M. Harb
Environment Exploration is the basic process that most of Multi Robot Systems applications depend on it. The exploration process performance depends on the coordination strategy between the robots participating in the team.  In this paper the coordination of Multi Robot Systems in the exploration process is surveyed, and the performance of different Multi Robot Systems exploration strategies is contrasted and analyzed for different environments and different team sizes.
Volume: 7
Issue: 1
Page: 48-58
Publish at: 2018-03-01

The Impact of Different Missing Data Handling Methods on DINA Model

10.11591/ijere.v7i1.11682
Seçil Ömür Sünbül
In this study, it was aimed to investigate the impact of different missing data handling methods on DINA model parameter estimation and classification accuracy. In the study, simulated data were used and the data were generated by manipulating the number of items and sample size. In the generated data, two different missing data mechanisms (missing completely at random and missing at random) were created according to three different amounts of missing data. The generated missing data was completed by using methods of treating missing data as incorrect, person mean imputation, two-way imputation, and expectation-maximization algorithm imputation. As a result, it was observed that both s and g parameter estimations and classification accuracies were effected from, missing data rates, missing data handling methods and missing data mechanisms.
Volume: 7
Issue: 1
Page: 77-86
Publish at: 2018-03-01

Fuzzy Takagi-Sugeno Method in Microcontroller Based Water Tank System

10.11591/ijra.v7i1.pp1-7
Nur Maisarah Mohd Sobran , Munirah Mohd Salmi , Mohd Bazli Bahar , Md Nazri Othman , Siti Halma Johari
This paper present the performance of Fuzzy logic controller in maintain level of water in water tank system. The mathematical modelling was developed to get the initial idea of the system performance. Later, the prototype of water tank system were constructed and tested to get the real time results. The Takagi-Sugeno “on” and “off” interference technique method was implemented due to the control limitation of the pump motor that being used in the experimental setup. The fuzzy logic controller was realized by embedded the algorithm in microcontroller of the water tank system. The experimental results show acceptable level of water within the range of 18cm to 20.5cm and settling time 59 seconds with 20 cm set point.
Volume: 7
Issue: 1
Page: 1-7
Publish at: 2018-03-01

Integrated Algorithm for Decreasing Active Power Loss

10.11591/ijai.v7.i1.pp33-41
Lenin Kanagasabai
This paper projects an Integrated Algorithm (IA) for solving optimal reactive power problem. Quick convergence of the Cuckoo Search (CS), the vibrant root change of the Firefly Algorithm (FA), and the incessant position modernization of the Particle Swarm Optimization (PSO) has been combined to form the Integrated Algorithm (IA).  In order to evaluate the efficiency of the proposed Integrated Algorithm (IA), it has been tested in standard IEEE 57,118 bus systems and compared to other standard reported algorithms. Simulation results show that Integrated Algorithm (IA) is considerably reduced the real power loss and voltage profile within the limits.
Volume: 7
Issue: 1
Page: 33-41
Publish at: 2018-03-01

Attitudes of Pre-Service Music Teachers towards Value Education in Turkey

10.11591/ijere.v7i1.10980
Ozgur Egilmez , Hatice Onuray Egilmez , Doruk Engur
In the music education curriculum, which is implemented from 2017-2018 academic year, the directive for teaching values was prepared for the first time. In this context, the research was conducted by comparing the attitudes of pre-service music teachers towards values education in terms of some variables, which will be included in the courses of value education according to the new music education curriculum. Data collected using the values education attitude scale were analysed using t-test, Kruskal-Wallis H test, and Spearman's correlation coefficient. Results showed that attitude scores did not change according to gender or level of parents’ education but had a significant difference according to the year students were in. Scale scores were not correlated with the amount of parents' income or students’ GPAs. This study is crucial as it tries to determine the attitudes of pre-service music teachers who are assigned as music teachers in a few years and will conduct music lessons according to the Ministry of National Education music curriculum. Moreover, it aims to shed light on the determination of targets for values education in the training of pre-service music teachers in the institutions that train music teachers with the help of the results that this study offers.
Volume: 7
Issue: 1
Page: 11-16
Publish at: 2018-03-01

Maximum Wind Energy Extraction by Using Neural Network Estimation and Predictive Control of Boost Converter

10.11591/ijra.v7i1.pp59-66
Mahdi Heidari
This paper proposes a new method to extract maximum energy from wind turbine systems. The artificial neural network (ANN) is used to estimate the wind speed based on the rotor speed and the output power. In addition to ANN, a predictive controller is used to maximize the efficiency of the boost converter. The method has been developed and analyzed by utilizing a turbine directly driven permanent-magnet synchronous generator (PMSG). The simulation results verify the performance of the proposed method. Results show that this method maximizes wind energy extraction with more accuracy and fastness.
Volume: 7
Issue: 1
Page: 59-66
Publish at: 2018-03-01

Investigation of Formation Control Approaches Considering the Ability of a Mobile Robot

10.11591/ijra.v7i1.pp18-38
Hannes Wind , Oliver Sawodny , Thomas Br•aunl
This work investigates and compares various formation control approaches for mobile robots. A comprehensive literature review was conducted, with particular focus on the approaches' applicability to be implemented on real mobile robots with limited hard and software capabilities. A realistic model of mobile robots is introduced and its parameters are identi ed with measurements from actual mo-bile robots. Later on, the model is extended and used within simulation studies of the various investigated approaches. A collision avoidance controller based on a formation controller is proposed and simulations are carried out. Experiments on real mobile robots are conducted for two formation controllers and for the pro-posed collision avoidance controller. It is shown that if the requirements resulting from the simulation studies are satis ed, an implementation on the real robots is possible.
Volume: 7
Issue: 1
Page: 18-38
Publish at: 2018-03-01

Improving Resilience and Self-Esteem among University Students with Entrepreneurship Simulation Board Game

10.11591/ijere.v7i1.11406
Kususanto Prihadi , Damien Z.Y. Cheow , Jonathan H.E Yong , Megaaneesh Sundrasagran
This study aims to evaluate the effect of the frequency of playing a board game that simulates entrepreneurial experience called “Traders” on the university students’ resilience and self-esteem. Traders Board Game (TBG) was developed in 2015 with an aim to improve several entrepreneurship skills among young adults, and resilience being one of them. Pre and posttests of resilience have been done to 12 participants before they were divided into three groups: the control group, who did not play the game, the experimental group A, who played the game once a week for three weeks, and the experimental group B, who played the game twice a week for three weeks. Resilience was measured by adapting Connor-Davidson Resilience Scale, whereas self-esteem was measured by utilizing Mruk two-dimensional Self-esteem scale. There was a statistically significant difference among the the three groups in resilience improvement, where the experimental group A scored the highest, and no significant difference was discovered in terms of self-eteem improvement. The results suggested that playing TBG in certain frequency significantly improves resilience among the participants.
Volume: 7
Issue: 1
Page: 48-56
Publish at: 2018-03-01

Power Harvesting Using Piezoelectric Shoe For External Power Storage

10.11591/ijeecs.v9.i3.pp655-659
Mohammad Saffri Mazalan , Roslina Mohamad , Murizah Kassim , Shahrani Shahbudin
The demands for portable energy source have increased because most portable electronic device needs the extra energy throughout the day due to the user’s increase in power consumption. Hence, a piezoelectric power harvesting shoe circuit with storage mechanism capabilities is designed by using piezoelectric disc material, 1N4007 bridge rectifiers, USB cables, and an external power storage. Piezoelectric disc material of 27mm and 35 mm in size that produces AC voltage when applied pressure is embedded in shoe’ insole and the output AC voltage is converted using a bridge rectifier for each material. The output is connected to a USB cable and can be connected to the external power storage during power harvesting. Different sizes of piezoelectric disc produce different amount of voltage and are also affected by the pressure applied to it. An amount of 5V is the requirements needed to charge an external device. The 27mm disc produces a voltage of 3V to 5V depending on the pressure applied while the 35mm disc produces 4V to 6.2V. Piezoelectric disc material is an alternative way to harvest energy when embedded to a shoe with an added storage capability as it solves the problem of needing the extra energy for electronic devices.
Volume: 9
Issue: 3
Page: 655-659
Publish at: 2018-03-01
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