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27,404 Article Results

Modeling and Control Analysis of Wind Turbine of Two Bladed and Three Bladed Wind Turbine Systems

10.11591/ijeecs.v15.i3.pp478-485
L V Suresh Kumar , Chintu Jaganmohanarao , Sai Lakshmi B
The wind power industry is currently the fastest growing renewable energy sector throughout the world. the aim of this paper is to implement the mathematical model and simulations torque control of two bladed and three bladed wind turbine systems by changing power coefficient, tip speed ratio and pitch angle values for different wind speeds.To ensure an economically competitive wind power production, the trend is to increase the turbine size while at the same time minimize material usage. In this paper we have two cases are developed one for two bladed and another for the three bladed wind turbines and compare the simulation results of both cases. The two balade and three blade systems are mathmatically developed and implemented in matlab simulink.
Volume: 15
Issue: 3
Page: 478-485
Publish at: 2015-09-01

A Review of the DTC Controller and Estimation of Stator Resistance in IM Drives

10.11591/ijpeds.v6.i3.pp554-566
Naveen Goel , Ram Narayan Patel , Saji Chacko
In recent years an advanced control method called direct torque control (DTC) has gained importance due to its capability to produce fast torque control of induction motor. Although in these systems such variables as torque, flux modulus and flux sector are required, resulting DTC structure is particularly simplistic. Conventional DTC does not require any mechanical sensor or current regulator and coordinate transformation is not present, thus reducing the complexity. Fast and good dynamic performances and robustness has made DTC popular and is now used widely in all industrial applications. Despite these advantages it has some disadvantages such as high torque ripple and slow transient response to step changes during start up. Torque ripple in DTC is because of hysteresis controller for stator flux linkage and torque. The ripples can be reduced if the errors of the torque and the flux linkage and the angular region of the flux linkage are subdivided into several smaller subsections. Since the errors are divided into smaller sections different voltage vector is selected for small difference in error, thus a more accurate voltage vector is selected and hence the torque and flux linkage errors are reduced. The stator resistance changes due to change in temperature during the operation of machine. At high speeds, the stator resistance drop is small and can be neglected. At low speeds, this drop becomes dominant. Any change in stator resistance gives wrong estimation of stator flux and consequently of the torque and flux. Therefore, it is necessary to estimate the stator resistance correctly. This paper aims to review some of the control techniques of DTC drives and stator resistance estimation methods.
Volume: 6
Issue: 3
Page: 554-566
Publish at: 2015-09-01

Perspective of Lecturers in Implementing PISMP Science Curriculum in Malaysia’s IPG

10.11591/ijere.v4i3.4503
Fauziah Hj Yahya , Abdul Rahim Bin Hamdan , Hafsah Binti Jantan , Halimatussadiah Binti Saleh
The article aims to identify lecturers’ perspectives in implementing PISMP science curriculum in IPG Malaysia based on teaching experience with KIPP model. The respondents consisted of 105 lecturers from 20 IPG Malaysia. The study used a questionnaire consisting of 74 items covering the four dimensions (Context, Input, Process and Product). Data collected through questionnaires were analyzed using one-way ANOVA. The study found that there was not a significant difference of curriculum goals and course objectives based on teaching experience at school. For input dimension, there was no significant difference of evaluation, content, source and pedagogy based on school teaching experience. In process dimension, there was no significant difference pedagogical process, the content and the process of assessment based on teaching experience at school. Furthermore, there was no significant difference of product dimension of science curriculum based on teaching experience at school. Based on the experience of teaching in IPG, lecturers did not have a significant difference of curriculum goals, course objectives, evaluation input, content, source, pedagogy, and evaluation process, and content process, but there were significant differences in the pedagogical input and product in the implementation of the PISMP science curriculum in IPG. Its discussions and recommendation were also discussed in this article.
Volume: 4
Issue: 3
Page: 130-137
Publish at: 2015-09-01

Strategies to Increase Representation of Students with Disabilities in Science, Technology, Engineering and Mathematics (STEM)

10.11591/ijere.v4i3.4497
Jeffry L. White , G.H. Massiha
As a nation wrestles with the need to train more professionals, persons with disabilities are undereducated and underrepresented in science, technology, engineering, and mathematics (STEM). The following project was proposed to increase representation of students with disabilities in the STEM disciplines. The program emphasizes an integrated program of interventions for college students with disabilities (SwD) majoring in STEM which centers on a system of continuous student monitoring with rapid access to academic and personal services, as well as professional development and degree enhancing experiences supplied during the entire period of college attendance.
Volume: 4
Issue: 3
Page: 89-93
Publish at: 2015-09-01

A Single-Phase Dual-Stage PV-Grid System with Active Filtering

10.11591/ijpeds.v6.i3.pp449-458
Slamet Riyadi , Yanuarsyah Haroen
Integrating photovoltaic based electricity into the grid and power quality improvement have become two major issues in electrical system. Formerly, these can be solved by using two converter systems separately, a PV-Grid System and an active power filter. But recent technology uses only a converter system to do both function. An existed shunt active power filter (SAPF) can be modified to form a dual-stage PV-Grid with active filtering capability. In this paper, a PV-Grid System that is capable to transfer all power generated by PV modules and reduce harmonic contents is proposed. The system was formed by connecting a boost chopper as a Maximum Power Point Tracker and PV modules to the DC-link capacitor of a single-phase SAPF. It just needed a current transducer and also required simpler control circuits. A voltage controller was needed to achieve power equilibrium while a current controller was needed to make the grid current sinusoidal with unity power factor. To verify the analysis, simulations and experiments were done.
Volume: 6
Issue: 3
Page: 449-458
Publish at: 2015-09-01

Using Particle Swarm Optimization, Genetic Algorithm, Honey Bee mating Optimization and Shuffle Frog Leaping Algorithm for solving OPF Problem with their Comparison

10.11591/ijeecs.v15.i3.pp445-451
Sajjad Ahmadnia , Ehsan Tafehi
Today using evolutionary programing for solving complex, nonlinear mathematical problems like optimum power flow is commonly in use. These types of problems are naturally nonlinear and the conventional mathematical methods aren’t powerful enough for achieving the desirable results. In this study an Optimum Power Flow problem solved by means of minimization of fuel costs for IEEE 30 buses test system by Particle Swarm Optimization (PSO), Genetic Algorithm (GA), Honey Bee Mating Optimization (HBMO) and Shuffle Frog Leaping Algorithm (SFLA), these algorithms has been used in MATLAB medium with help of MATHPOWER to achieving more precise results and comparing these results with the other proposed results in other published papers.
Volume: 15
Issue: 3
Page: 445-451
Publish at: 2015-09-01

Improving Students Soft Skills Using Thinking Process Profile Based On Personality Types

10.11591/ijere.v4i3.4502
M.J. Dewiyani Sunarto
The challenge in education field these days rises as the cause of society’s expectation for higher education. This increasingly complex expectation demands that higher education prepares the students to gain integrity. Higher education provides not only hard skills for the student, but also soft skills. By observing the hard skills side, Dewiyani [1] discovers a learning method based on cognitive process that is classified by personality types. This finding is proved to be effective in enabling students to solve problems. By utilizing the finding as well as employing qualitative and development methods, this research serves a purpose of developing learning method that can improving students’ soft skills attributes based on personality types. This leads to the conclusion that the cognitive process will also have the same influence on personal and interpersonal behaviors. The findings gained from this research demonstrate that soft skills attribute showed by every personality is various and it can be improved through the application of learning models that put forward cognitive process based of personality type classification. According to the gained findings, it is recommended that this learning model can be expanded to cover other subjects in higher education syllabus
Volume: 4
Issue: 3
Page: 118-129
Publish at: 2015-09-01

The Operating Improvement of the Supply Source and the Optimization of PWM Control

10.11591/ijpeds.v6.i3.pp603-614
Farouk Hadj Benali , Fouad Azzouz , Ghalem Bachir
In this paper the operating improvement of the supply source and the optimization of PWM control are proposed. A comparison (based on the better operating in terms of input voltage) between the multilevel inverters (NPC multilevel inverter and H bridge inverter) is studied. Then two control strategies (the SPWM and the suboptimal PWM) are applied to the multilevel inverter which has the better voltage performance. At last a comparison between these two control techniques based on two essential points, the THD and the output voltage value. A comparison between our results and results taken from literature is also presented in this paper. Simulations are carried out using PSIM environment.
Volume: 6
Issue: 3
Page: 603-614
Publish at: 2015-09-01

Looking at the Social Activity for Adolescents with Orthopedic Impairments

10.11591/ijere.v4i3.4500
Leslie Biastro , Heather Frank , Karen H Larwin
Adolescents with identified orthopedic impairments are often less likely to participate in social activities outside of the school setting. However, the adolescents who are able to participate in activities have higher social skills, more academic successes, and show more satisfaction in their roles as family member or friend. The aim of this study was to look at adolescents with orthopedic impairments and their level of participation in social activities.   Also looked at was the adolescent’s report of a higher level of fulfillment in their family or friend role if they participated in social activities.  Responses of adolescents from a national school-based survey were used in the study.  The results revealed that students with orthopedic impairments were just as happy as their peers when they participated in social activities.
Volume: 4
Issue: 3
Page: 106-111
Publish at: 2015-09-01

Fractional order PID Design using the Taguchi method

10.11591/ijra.v4i3.pp176-185
Somayeh Nouruzi Ghazbi , Alireza Akbarzadeh
This paper presents a gain-tuning scheme for Fractional order PID control systems using the Taguchi method. A prismatic series elastic actuator is selected as an experimental set-up. An optimal controller gains has been obtained through a series of experiments suggested by the Taguchi method. Four stages of tuning are performed in order to accurately tune the controller gains. It is shown that when performance of the proposed controller is compared with two additional controllers: a traditional FOPID tuned with Ziegler-Nichols (Z-N) method and a PID tunned with genetic algorithm, a 94% and 84% improvements in position error is observed, respectively.
Volume: 4
Issue: 3
Page: 176-185
Publish at: 2015-09-01

Adaptive Sliding Mode Controller Design For Attitude Small UAV

10.11591/ijra.v4i3.pp219-229
Samaneh Amini
The dynamic of Unmanned Aerial Vehicle (UAV) is nonlinear, strongly coupled, multi-input multi-output (MIMO), and subject to uncertainties and external disturbances.  In this paper, an adaptive sliding mode controller (ASMC) is integrated to design the attitude control system for an inner loop fixed wing UAV. In the proposed scheme, sliding mode control law parameters due to uncertainty are assumed to be unknown and are estimated via adaptation laws. The synthesis of the adaptation laws is based on the positivity and Lyapunov design principle. Navigation outer loop parameters are regulated via PID controllers. Simulation results indicate that the proposed controller design can stabilize the nonlinear system, and it is robust to parametric model uncertainties and external disturbance.
Volume: 4
Issue: 3
Page: 219-229
Publish at: 2015-09-01

Performance Analysis of ZigBee Mesh WSN in Carbon Monoxide Gas Monitoring System

10.11591/ijeecs.v15.i3.pp576-583
Muhammad Fuad , Muhammad Iqbal , Mamat Rahmat , Heru Sukoco , Husin Alatas
The need for air pollutant monitoring system is very substantial especially in the developing countries such as Indonesia. In this research, we have performed a test of such system for carbon monoxide gas based on wireless sensor network (WSN) using ZigBee. This system is working with a mesh topology where each sensor node can communicate with one another. There are seven nodes that serve as sensor nodes and one node serving as Coordinator. Each sensor node has five components that represent of gas sensors. We measure three performance metrics during the test, i.e. throughput, delay, and packet loss. The system has been successfully implemented which is capable of displaying information in real time. The experiment resulted in an average carbon monoxide value of 25.1 ppm and showed a good performance. It showed a throughput more than 1.017 kbps, delay and packet loss ratio less than 409 ms and 5 %, respectively.
Volume: 15
Issue: 3
Page: 576-583
Publish at: 2015-09-01

The Process of Thinking among Junior High School Student in Solving HOTS Question

10.11591/ijere.v4i3.4504
Bakry Bakry , Md Nor Bin Bakar
Higher order thinking skills (HOTS) is one of the important aspect of teaching and learning mathematics. By using HOTS, student will be able to acquire a deep understand of mathematical concepts and can be applied in real life. Students ability to develop the capacity of the HOTS is closely related with thinking processes while solving mathematics problems. This research focused, at describing the thinking process of students in solving mathematical problem involving HOTS problem. The method used is a qualitative method and case study design, the data collected through mathematics tests and interviews. There are 3 students selected as participant Data analysis techniques are descriptive qualitative, analysis according to the model proposed by Miles and Huberman (1992), namely data reduction, data presentation and conclusion. The result of the study showed that the students thinking process in solving mathematics problem is by using the systematic thinking (1) creating of meaning (2) making of opinion, and 3) making conclution.
Volume: 4
Issue: 3
Page: 138-145
Publish at: 2015-09-01

A Techniques to Downgrade Objective Function in Parallel Robot Kinematics Problem

10.11591/ijra.v4i3.pp186-195
Trung Thanh Trang , Guang Wei Li , Long Thanh Pham
Quadratic functions and quaternary functions are preferable forms solving parallel robot kinematics problems. In order to simplify and to use only one method to solve all forms of the objective functions, this article introduces prevalent techniques to downgrade mathematical model of the objective functions from quaternary function to quadratic function in parallel robot kinematics problem. By using equivalent alternative kinematic structure and additional mathematical constraints, we will change from the study of parallel robot kinematics problem with the form of quaternary objective function as the original configuration to equivalent alternative configuration in the form of quadratic objective function. The parallel robot kinematics problem based on alternative configuration with quadratic objective function is not only simpler but also helps to quickly identify the mathmatical relationships in the joint space and work space of parallel robot. Then, more accurate control solution of parallel robot kinematics problem can be identified. Moreover, by using techniques in this study, all forms of objective functions of parallel robot of any structure can be easily solved. The result from numerical simulation has been used to prove the presented approaches.
Volume: 4
Issue: 3
Page: 186-195
Publish at: 2015-09-01

Emotions Et Sentiments Induits Par Les Evaluations Sommatives Chez Des Apprenants En Situation De Formation Professionnelle

10.11591/ijere.v4i3.4506
Mathias Kyelem , Amadou Tamboura , Daniel Favre
To prove the quality of their teaching activities, school leaders and teachers are almost always resort to summative assessments; the level of the scores obtained by the largest number of students for assays or exams is the best indicator of the quality of learning achieved by students. Summative assessments become sufficiently numerous to help establish report cards and rankings monthly to the detriment of a formative assessment needed to regulate and guide the educational activity. All this does not take into account the dynamics of the error in learning and the stress state in which the learner is then subjected to a strong emotional pressure. Research in neuroscience show that a high level of anxiety causes a deficit in the ability to perform tasks involving solving non-routine problems. In this study, most of the respondents have had several years of professional training and a long teaching practice. It was interesting to explore their relationship to error and their level of apprehension of the summative evaluation in a context where they are in the process of "exercise" the student work. In general, the results show that the dominant fundamental emotion among all respondents is the fear as with most recurrent words anxiety, worry, fear, feelings or emotions that inhibit the action.
Volume: 4
Issue: 3
Page: 155-164
Publish at: 2015-09-01
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