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25,002 Article Results

Magnetic Field Effect on the Electrical Characteristics of a Monocrystalline n+pp+ Silicon Solar Cell

10.11591/ijaas.v3.i4.pp196-201
sarhan musa
In this paper, the effect of magnetic field on I-V characteristics of a silicon solar cell of n+pp+ structure is studied in dark and illumination modes. In dark, both the current and the voltage decrease with increasing the magnetic field in forward bias. However in reverse bias, the behavior is different. Under illumination, the effect of magnetic field on I-V characteristics of the silicon solar cell is studied experimentally and simulated using Neural Network Algorithm (NNA). Both short circuit current (Isc) and open circuit voltage (Voc) are measured under the influence of magnetic field. The solar cell efficiency and the fill factor (FF) are calculated without and with the magnetic field. This performance testing of the solar cell under magnetic field can be considered as one of the non-destructive reliability tools.
Volume: 3
Issue: 4
Page: 196-201
Publish at: 2014-12-01

Modeling and Analysis of Transformerless High Gain Buck-boost DC-DC Converters

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/5026
Vu Tran , Mufeed MahD
This paper proposes a transfomerless switched capacitor buck boost converter model, which provides higher voltage gain and higher efficiency when compared to the conventional buck boost converter. The averaged model based on state-space description is analyzed in the paper. The simulation results are presented to confirm the capability of the converter to generate high voltage ratios. The comparison between the proposed model and the traditional model is also provided to reveal the improvement. The proposed converter is suitable for for a wide application which requires high step-up DC-DC converters such as DC micro-grids and solar electrical energy.DOI: http://dx.doi.org/10.11591/ijpeds.v4i4.6386
Volume: 4
Issue: 4
Page: 528-537
Publish at: 2014-12-01

Dispositif Pédagogique Pour L’apprentissage Des Oxydations Respiratoires Et La Résolution De Problèmes Non Routiniers

https://ijere.iaescore.com/index.php/IJERE/article/view/4484
Mathias Kyélem , Daniel Favre
In the sixth option D Form classroom, breathing is considered in terms of respiratory gas exchange and bioenergetics. The syllabus is generally away from the concept of breathing as seen in social representations and elsewhere at school, which is close to the old conceptions in many respects. Former introduction to those old conceptions hinders students’ ability to relate the enzymatic processes they are learning and the knowledge acquired in lower classes from the study of nutritional functions. This makes it necessary to develop teaching methods likely to incite learning in other disciplines and favor knowledge transfer towards solving non-routine problems. An experiment was conducted in Burkina Faso taking into account these issues and using a pedagogical device implementing a method of learning through problem-solving and integrating error treatment by teachers and socio-cognitive debate. This device, developed by the LIRDEF’s Didactics and Socialization Department, University of Montpellier II, shows that when students’ autonomy and right to make errors are valued and their emotional security guaranteed, they make significant learning following confrontation of their arguments.DOI: http://dx.doi.org/10.11591/ijere.v3i4.6937
Volume: 3
Issue: 4
Page: 245-258
Publish at: 2014-12-01

A Difference-Based Feature Description Method of Image Target

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/3945
Qiang Gao , Wu Yang , Hongye Yang
This paper proposed a new method of feature description for target recognition and matching. Firstly, a method of calculating the difference was defined. The gray value matrix of an image was converted to a difference value matrix. Then the difference value, shape, angle and other features of a region and the combined features between regions were described. Finally, the method was applied to identify traffic signs. Experiments showed that the proposed method can represent multiple features of image such as the gray differences, the shape changes, and so on. Through theoretical and simulation analysis, even under rotation, shift or scale transformation, new features description method still can correctly recognize the target.  http://dx.doi.org/10.11591/telkomnika.v12i12.6568 
Volume: 12
Issue: 12
Page: 8268-8277
Publish at: 2014-12-01

Islanding Detection of Inverter Based DG Unit Using PV System

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/5017
M. Divyasree , L.Venkata Narasimha Rao
Distributed generation (DG) units are rapidly increasing and most of them are interconnected with distribution network to supply power into the network as well as local loads Islanding operations of DG usually occur when power supply from the main utility is interrupted due to several reasons but the DG keeps supplying power into the distribution networks. a new method for islanding detection of inverter-based distributed generation (DG). Although active islanding detection techniques have smaller non detection zones than passive techniques, active methods could degrade the system power quality and are not as simple and easy to implement as passive methods. The phenomenon of unintentional islanding occurs when a distributed generator (DG) continues to feed power into the grid when power flow from the central utility source has been interrupted. A simple islanding detection scheme has been designed based on this idea. The proposed method has been studied under multiple-DG operation modes and the UL 1741 islanding tests. The simulations results, carried out by MATLAB/Simulink, show that the proposed method has a small Non detection zone.DOI: http://dx.doi.org/10.11591/ijpeds.v4i4.6257
Volume: 4
Issue: 4
Page: 438-450
Publish at: 2014-12-01

Ultra-Wideband Patch Antenna for K-Band Applications

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/3943
Umair Rafique , Syed Ahsan Ali
An ultra-wideband patch antenna is presented for K-band communication. The antenna is designed by employing stacked geometry and aperture-coupled technique. The rectangular patch shape and coaxial fed configuration is used for particular design. The ultra-wideband characteristics are achieved by applying a specific surface resistance of 75 ohm/square to the upper rectangular patch and it is excited through a rectangular slot made on the lower patch element (made of copper). The proposed patch antenna is able to operate in the frequency range of 12-27.3 GHz which is used in radar and satellite communication, commonly named as K-band. By employing a technique of thicker substrate and by applying a specific surface resistance to the upper patch element, an impedance bandwidth of 77.8\% is achieved having VSWR less than 2. It is noted that the gain of proposed antenna is linearly increased in the frequency range of 12-26 GHz and after that the gain is decreased up to 6 dBi. Simulation results are presented to demonstrate the performance of proposed ultra-wideband microstrip patch antenna.  http://dx.doi.org/10.11591/telkomnika.v12i12.6520 
Volume: 12
Issue: 12
Page: 8252-8256
Publish at: 2014-12-01

Proposed Voltage Vector to Optimize Efficiency of Direct Torque Control

https://ijpeds.iaescore.com/index.php/IJPEDS/article/view/5031
Goh Wee Yen , Ali Monadi , Nik Rumzi Nik Idris , Auzani Jidin , Tole Sutikno
Compared to field-oriented control (FOC) system, direct torque control (DTC) system has gained attractiveness in control drive system because of its simpler control structure and faster dynamic control. However, supplying the drive system with rated flux at light load will decrease the power factor and efficiency of the system. Thus, an optimal flux has been applied during steady-state in order to maximize the efficiency of drive system. But when a torque is suddenly needed, for example during acceleration, the dynamic of the torque response would be degraded and it is not suitable for electric vehicle (EV) applications. Therefore, a modification to the voltage vector as well as look-up table has been proposed in order to improve the performance of torque response.DOI: http://dx.doi.org/10.11591/ijpeds.v4i4.6918
Volume: 4
Issue: 4
Page: 578-586
Publish at: 2014-12-01

Research and Application on Fractional-Order Darwinian PSO Based Adaptive Extended Kalman Filtering Algorithm

10.11591/ijra.v3i4.pp245-251
Qiguang Zhu , Mei Yuan , Yao-long Liu , Wei-dong Chen , Ying Chen , Hong-rui Wang
To resolve the difficulty in establishing accurate priori noise model for the extended Kalman filtering algorithm, propose the fractional-order Darwinian particle swarm optimization (PSO) algorithm has been proposed and introduced into the fuzzy adaptive extended Kalman filtering algorithm. The natural selection method has been adopted to improve the standard particle swarm optimization algorithm, which enhanced the diversity of particles and avoided the premature. In addition, the fractional calculus has been used to improve the evolution speed of particles. The PSO algorithm after improved has been applied to train fuzzy adaptive extended Kalman filter and achieve the simultaneous localization and mapping. The simulation results have shown that compared with the geese particle swarm optimization training of fuzzy adaptive extended Kalman filter localization and mapping algorithm, has been greatly improved in terms of localization and mapping.
Volume: 3
Issue: 4
Page: 245-251
Publish at: 2014-12-01

Problem Based Learning in Cooperative Situation (PBLCS) and Its Impact on Development of Personal Intelligence

https://ijere.iaescore.com/index.php/IJERE/article/view/4483
Ahmad Talib , Ismail bin Kailani
The objective of this study was focused on the observation on the practice of PBLCS learning model, and its impact on the development of personal intelligence (interpersonal and intrapersonal) students. This study used a quasi-experimental design with one factor measurement. The study population was students of class XI, IPA (Natural Science) SMAN (Senior High School) 22 in Makassar City, including 6 top schools and 16 regular schools, in the second semester in the period 2012/2013. The sample of this study included both one top school and two regular schools using a random sampling technique. Based on the sample selection technique, two classes were selected from the top school; SMAN 1 and two classes from regular classes; SMAN 4, and SMAN 18, involving 103 students for PBLCS and 103 students for PT (traditional class). Data of this study were analyzed inferentially and descriptively, inferential analysis using multivariate statistic and a multivariate analysis using variance or one-way MANOVA. The results of this study showed that the implementation of PBLCS model (treated class) was better than the PT strategy (controlled class) in developing personal intelligence of students, with the significance 0.000 <α = 0.05. It was supported by descriptive data indicating that the mean score of personal intelligence development. Both interpersonal and intrapersonal intelligence of students in the treated class was higher than the development of interpersonal or intrapersonal intelligence students in the controlled class.DOI: http://dx.doi.org/10.11591/ijere.v3i4.6969
Volume: 3
Issue: 4
Page: 236-244
Publish at: 2014-12-01

A LQR Optimal Method to Control the Position of an Overhead Crane

10.11591/ijra.v3i4.pp252-258
J. Jafari , M. Ghazal , M. Nazemizadeh
In this paper, a LQR (Linear Quadratic Regulation) optimal method is implemented to control position of an overhead carne. To do this, a tracking formulation of LQR is developed and applied to the system. Hence the dynamic model of the overhead crane is presented, the dynamic of the actuator motor of the trolley is considered. As the parameters of the optimal controller assigned, some simulations are done to show the efficiency of the proposed method.
Volume: 3
Issue: 4
Page: 252-258
Publish at: 2014-12-01

Study on Smart Grid System Based on System Dynamics

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/3908
Cui He-Rui , Xu Peng
Smart Grid is a large complex system, involving generation, transmission, distribution and delivery of four links. This paper analyzes the structure of the smart grid system in depth with a combination of qualitative and quantitative research approach. Then it explains state variables, rate variables and constants in the development of smart grid system under the Vensim software environment and analyzes subsystems causal feedback relationship in a macro point of view. Finally, this paper analyzes the simulation on the amount of funding and professionals in the smart grid system dynamics flow diagram after inputting DYNAMO language equations. The simulation analysis shows that the development of the smart grid should focus on training professionals. Professional talent is a source of strength in the smart grid development. At the same time, we should also pay attention to industrial policy related to the smart grid and seek break under the guidance of policy. http://dx.doi.org/10.11591/telkomnika.v12i12.5986 
Volume: 12
Issue: 12
Page: 7979-7986
Publish at: 2014-12-01

Clustering Algorithm Combined with Hill Climbing for Classification of Remote Sensing Image

https://ijece.iaescore.com/index.php/IJECE/article/view/5510
B.Sai Chandana , K. Srinivas , R. Kiran Kumar
Clustering is an unsupervised classification method widely used for classification of remote sensing images.  As the spatial resolution of remote sensing images getting higher and higher, the complex structure is the simple objects becomes obvious, which makes the classification algorithm based on pixels being losing their advantages. In this paper, four different clustering algorithms such as K-means, Moving K-means, Fuzzy K-means and Fuzzy Moving K-means are used for classification of remote sensing images. In all the traditional clustering algorithms, number of clusters and initial centroids are randomly selected and often specified by the user. In this paper, a hill climbing algorithm for the histogram of the input image will generate the number of clusters and initial centroids required for clustering.   It overcomes the shortage of random initialization in traditional clustering and achieves high computational speed by reducing the number of iterations. The experimental results show that Fuzzy Moving K-means has classified the remote sensing image more accurately than other three algorithms.DOI:http://dx.doi.org/10.11591/ijece.v4i6.6608
Volume: 4
Issue: 6
Page: 923-930
Publish at: 2014-12-01

A mini-UAV VTOL Platform for Surveying Applications

10.11591/ijra.v3i4.pp259-267
Kuldeep Rawat , Ellis Lawrence
In this paper we discuss implementation of a mini-Unmanned Aerial Vehicle (UAV) vertical take-off and landing (VTOL) platform for surveying activities related to highway construction. Recent advances in sensor and communication technologies have allowed scaling sizes of unmanned aerial platforms, and explore them for tasks that are economical and safe over populated or inhabited areas. In highway construction the capability of mini-UAVs to survey in hostile and/or hardly accessible areas can greatly reduce human risks. The project focused on developing a cost effective, remotely controlled, fuel powered mini-UAV VTOL (helicopter) platform with certain payload capacity and configuration and demonstrated its use in surveying and monitoring activities required for highway planning and construction. With an on-board flight recorder global positioning system (GPS) device, memory storage card, telemetry, inertial navigation sensors, and a video camera the mini-UAV can record flying coordinates and relay live video images to a remote ground receiver and surveyor. After all necessary integration and flight tests were done the mini-UAV helicopter was tested to operate and relay video from the areas where construction was underway. The mini-UAV can provide a platform for a range of sensors and instruments that directly support the operational requirements of transportation sector.
Volume: 3
Issue: 4
Page: 259-267
Publish at: 2014-12-01

Dynamic Behavior of a SCARA Robot by using N-E Method for a Straight Line and Simulation of Motion by using Solidworks and Verification by Matlab/Simulink

10.11591/ijra.v3i4.pp221-233
Fernini Brahim , Mustapha Temmar
SCARA (Selective Compliant Assembly Robot Arm) robot of serial architecture is widely used in assembly operations and operations "pick-place", it has been shown that use of robots improves the accuracy of assembly, and saves assembly time and cost as well. The most important condition for the choice of this kind of robot is the dynamic behavior for a given path, no closed solution for the dynamics of this important robot has been reported. This paper presents the study of the kinematics (forward and inverse) by using D-H notation and the dynamics of SCARA robot by using N-E methods. A computer code is developed for trajectory generation by using inverse kinematics, and calculates the variations of the torques of the links for a straight line (path rest to rest) between two positions for operation "pick-place". SCARA robot is constructed to achieve “pick-place» operation using SolidWorks software. And verification by Matlab/Simulink. The results of simulations were discussed. An agreement between the two softwares is certainly obtained herein
Volume: 3
Issue: 4
Page: 221-233
Publish at: 2014-12-01

A New Image Encryption Algorithm Based on Two-dimensional Coupled Chaotic Map

10.11591/ijeecs.v12.i12.pp8229-8237
Li Tu , Liyuan Jia , Chi Zhang , Saiqiu Guo
In this paper, a kind of two-dimensional coupled chaotic transcendental map (TCCTM) was proposed. Firstly, by using the TCCTM chaotic sequences were generated,then the chaotic sequences were modified to generate chaotic key stream that is more suitable for image encryption. In the process of encryption， an original color image was decomposed into three images of red, green and blue components, and encrypted them in a different way respectively.  The experimental results demonstrate that the extremely sensitive to the key, the encrypted image has random-like distribution behavior of grey values, the adjacent pixels have zero co-correlation properties. Furthermore, the algorithm shows the advantages of large key space and high speed of encryption.
Volume: 12
Issue: 12
Page: 8229-8237
Publish at: 2014-12-01
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