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31,456 Article Results

Emotional exhaustion and organizational commitment: Primary school teachers’ perspective

10.11591/ijere.v9i4.20727
Mozes M. Wullur , Basilius Redan Werang
Teaching is a noble profession to educate the youth of nations facing today’s global challenges. Teaching, at the same time, has become a highly challenging profession and occasionally a draining work, especially for those who are working in the remote areas. A high-level of teacher absenteeism in the primary schools of Southern Papua has blown some societal alarm for conducting studies focusing on emotional exhaustion as a latent predictor for low-performance. This study attempted to describe the eventual correlation between the emotional exhaustion and organizational commitment of teachers working in the primary schools of Merauke, Indonesia. A survey approach was employed to collect data from a total of 243 primary school teachers in Merauke, Papua, Indonesia. Data were examined statistically by employing Pearson’s correlation model. Results of analysis showed that the emotional exhaustion and commitment of primary school teachers in Merauke, Indonesia, are significantly negatively correlated. This result may be useful for the teachers to benefit from the information of how they may interact with all the school elements and the extent to which these emotions directly affect their organizational commitment. The result may also be advisable for the school leaders to take some tactical efforts of securing teachers’ emotion to promote a high-level of teachers’ organizational commitment and, in turn, improving students’ capabilities in reading, writing, and arithmetics.
Volume: 9
Issue: 4
Page: 912-919
Publish at: 2020-12-01

Bidirectional single-loop current sensorless control applied to NPC multi-level converter considering conduction losses

10.11591/ijpeds.v11.i4.pp1945-1957
Alexander Suzdalenko , Janis Zakis , Pavels Suskis , Leonids Ribickis
The current feedback is considered as unavoidable part of most control system driving power electronic converters. However, it is possible to eliminate the use of current sensor, if properly calculated volt-second balance is applied to input inductor. This paper describes the implementation of current sensorless control technique applied to neutral point clamped multi-level converter, where only voltage control-loop is used to stabilize internal capacitors voltage, while inductor’s current is shaped by means of current sensorless control block in both discontinuous and continuous current modes. The capacitor voltage balancing is implemented by means of delta-controller that selects alternative capacitor in respect to main switching scheme. Finally, the analytical study of proposed solution is verified with simulation results.
Volume: 11
Issue: 4
Page: 1945-1957
Publish at: 2020-12-01

Software engineering based fault tolerance model for information system in plants shopping center

10.11591/ijece.v10i6.pp6664-6672
Saja Nasir , Muayad Croock , Salih Al-Qaraawi
The rapid development of mobile phone technologies in recent years promoted them for being used in various areas of life, such as commercial, health, transportation and tourism and other uses. In this paper, a software engineering based fault tolerance model is proposed to manage the expected faults in the adopted servers. The underlying QR based information system in plants shopping center employs different local serves allocated at local shops that are connected to the main server. In a fault case detection at any local server, the main server can cover the management of the system until the maintenance is completed. This is performed in efficient way as the main server keeps a copy of the information for all local branches. It is important to note that the self-checking process is adopted for fault detection. After completing the maintenance, a copy of the updated information is sent back to the investigated local server including all sales, etc. Moreover, the main and local servers contain information about all offer’s plants in different languages and in text and image form, customer's information and admin's information. The proposed system is tested in several cases to prove the efficiency and effectivity in retrieving and managing information and data as well as the fault tolerance administration.
Volume: 10
Issue: 6
Page: 6664-6672
Publish at: 2020-12-01

Arduino based gas leakage and temperature monitoring and control system

10.11591/ijict.v9i3.pp171-178
Adoyi Boniface , A.Y. Nasir , A. M. Hassan
Gas leakage is a major problem with industrial sectors, residential premises and gas powered vehicles like CNG (Compressed Natural Gas) buses etc. One of the preventive methods to stop accidents associated with the gas leakage is to install a gas leakage detection device at vulnerable places. The aim of this project is to develop such a device that can automatically detect and control gas leakages and also monitor temperature in vulnerable areas. The system detects the leakage of the LPG (Liquefied Petroleum Gas) using a gas sensor and then also monitors the temperature using a temperature sensor. When the LPG concentration in the air exceeds a certain level, the gas sensor senses the gas leakage and the output of the sensor goes LOW, the system then opens the exit windows, and then uses the GSM to alert the person about the gas leakage via SMS. Also, when the temperature of the environment exceeds a certain limit, it then turns ON the LED (indicator) and make an alarm through the buzzer. An LCD (16x2) displays the current temperature and gas leakage status in degree Celsius and PPM respectively.
Volume: 9
Issue: 3
Page: 171-178
Publish at: 2020-12-01

Harmonic spectra of BLDC motor supplied by a solar PV multilevel inverter

10.11591/ijeecs.v20.i3.pp1693-1702
Afaneen Anwer Abbood
The multilevel inverters have been used especially in renewable energy aspects in order to assess total harmonic distortion (THD).  THD is considered to produce a good quality of current signal of BLDC motor drive. In this paper, a solar PV inveter fed brushless DC (BLDC) motor drive is discussed considering two topologies of three phase multilevel inverters. These topologies are flying capacitor and clamped diode inverters. The inverter efficiency and output power have an effectiveness on THD values. A boost dc to dc converter using incremental conductance maximum power point tracking (INC-MPPT) is implemented with a solar PV. The mathematical model of the proposed systems ares tudied via simulation using Matlab/Simulink. The simulation results of a BLDC motor based on two multilevel inverters are compared with each other considering the  THD and the utilization of the dc-bus voltage, the comparition verified  that the clamped diode inverter has a better harmonic spectra.still the overshoot is a little bit high in the two types of inverter that are proposed. 
Volume: 20
Issue: 3
Page: 1693-1702
Publish at: 2020-12-01

Coast function parameters optimization for DC battery source inverter feeding three-phase inductive load

10.11591/ijpeds.v11.i4.pp1799-1804
Riyadh G. Omar
The commonly reported measures of the predictive accuracy are evaluated in this paper. Absolute, squared, percentage, and integral errors methods are implemented, to reduce the objective function, which employed in model predictive control. These methods are usually investigated for dc source inverter, which controlled by finite set model predictive current control system, with three phase induction motor load. In this paper, the evaluation includes different aspects, accuracy, complexity, system harmonics content, and execution time. A vital criterion in this process is the performance of the inverter, and the matching between the reference and the measured machine currents. The evaluation shows that for one term objective function, absolute and square errors give similar results with less execution time for the absolute error, but if multi terms objective function the square error is better.
Volume: 11
Issue: 4
Page: 1799-1804
Publish at: 2020-12-01

Design and implementation of proposed 320 bit RC6-cascaded encryption/decryption cores on altera FPGA

10.11591/ijece.v10i6.pp6370-6379
Ashwaq T. Hashim , Ahmed M. Hasan , Hayder M. Abbas
This paper attempts to build up a simple, strong and secure cryptographic algorithm. The result of such an attempt is “RC6-Cascade” which is 320-bits RC6 like block cipher. The key can be any length up to 256 bytes. It is a secret-key block cipher with precise characteristics of RC6 algorithm using another overall structure design. In RC6-Cascade, cascading of F-functions will be used instead of rounds. Moreover, the paper investigates a hardware design to efficiently implement the proposed RC6-Cascade block cipher core on field programmable gate array (FPGA). An efficient compact iterative architecture will be designed for the F-function of the above algorithm. The goal is to design a more secure algorithm and present a very fast encryption core for low cost and small size applications.
Volume: 10
Issue: 6
Page: 6370-6379
Publish at: 2020-12-01

Direct predictive speed control of permanent magnet synchronous motor fed by matrix converter

10.11591/ijpeds.v11.i4.pp2183-2193
Najmeh Movahhed Neya , Sajad Saberi , Babak Mozafari
This paper proposes a non-cascade -single loop- Direct Speed Control algorithm for surface mounted Permanent Magnet Synchronous Motor (PMSM) fed by Matrix Converter. The proposed method uses Finite Control Set Model Predictive Control (FCS-MPC) to manipulate system speed and currents simultaneously. Also, for better performance of the predictive method, an observer designed to estimate mechanical torque and other uncertain parameters of the mechanical subsystem as a lumped disturbance. Simulation results using Matlab/Simulink demonstrate the performance of proposed algorithm.
Volume: 11
Issue: 4
Page: 2183-2193
Publish at: 2020-12-01

An efficient method to classify GI tract images from WCE using visual words

10.11591/ijece.v10i6.pp5678-5686
R. Ponnusamy , S. Sathiamoorthy , R. Visalakshi
The digital images made with the Wireless Capsule Endoscopy (WCE) from the patient's gastrointestinal tract are used to forecast abnormalities. The big amount of information from WCE pictures could take 2 hours to review GI tract illnesses per patient to research the digestive system and evaluate them. It is highly time consuming and increases healthcare costs considerably. In order to overcome this problem, the CS-LBP (Center Symmetric Local Binary Pattern) and the ACC (Auto Color Correlogram) were proposed to use a novel method based on a visual bag of features (VBOF). In order to solve this issue, we suggested a Visual Bag of Features(VBOF) method by incorporating Scale Invariant Feature Transform (SIFT), Center-Symmetric Local Binary Pattern (CS-LBP) and Auto Color Correlogram (ACC). This combination of features is able to detect the interest point, texture and color information in an image. Features for each image are calculated to create a descriptor with a large dimension. The proposed feature descriptors are clustered by K- means referred to as visual words, and the Support Vector Machine (SVM) method is used to automatically classify multiple disease abnormalities from the GI tract. Finally, post-processing scheme is applied to deal with final classification results i.e. validated the performance of multi-abnormal disease frame detection.
Volume: 10
Issue: 6
Page: 5678-5686
Publish at: 2020-12-01

Fractional-order sliding mode controller for the two-link robot arm

10.11591/ijece.v10i6.pp5579-5585
Trong-Thang Nguyen
In this paper, the author proposes a sliding mode controller with the fractional-order for the two-link robot arm. Firstly, the model and dynamic equations of the two-link robot arm are presented. Based on these equations, the author builds the controller for each joint of the robot. The controller is a sliding mode controller with its order is not an integer value. The task of the controller is to adjust the torques acted on the joints in order for the angular coordinates of each link to coincide with the desired values. The effectiveness of the proposed control system is demonstrated through Matlab-Simulink software. The robot model and controller are built to investigate the system quality. The results show that the quality of the control system is very high: there is not the chattering phenomenon of torques, the response angles of each link quickly reach the desired values, and the static error equal to zero.
Volume: 10
Issue: 6
Page: 5579-5585
Publish at: 2020-12-01

Islanding detection in a distribution network with distributed generators using signal processing techniques

10.11591/ijpeds.v11.i4.pp2099-2106
Seong-Cheol Kim , Papia Ray , Surender Reddy Salkuti
This paper proposes quick & accurate islanding detection technique for a distribution system with distributed generators (DGs). Here two schemes of islanding detection based on signal processing is proposed of which one is based on discrete wavelet transform (DWT) with artificial neural network (ANN), and another one is based on S-transform with ANN. The negative sequence current/voltage signals are retrieved at targeted DG location which are used for islanding detection in the distribution system. Here, the wavelet and S-transforms are used for fault location and classification applications. Further, the feature extraction is used for reducing the size of data matrix by transforming it into set of features. In this work, particle swarm optimization (PSO) based feature selection scheme is applied. Simulation results on test system indicate the efficacy of proposed islanding detection techniques.
Volume: 11
Issue: 4
Page: 2099-2106
Publish at: 2020-12-01

Flux modulated rotating pole piece magnetic gear

10.11591/ijpeds.v11.i4.pp1731-1736
Mohd Firdaus M. A Halim , E. Sulaiman , R. N. F. K. R. Othman
In this paper, the CMG is re-condition so that the pole piece act as the outer rotor instead of surface mount PM. This magnetic coupling of the CMG is similar to the conventional CMG which uses harmonic to transfer the torque and speed from the inner rotor to the outer rotor. The working principle of the proposed CMG is derived analytically and simulated using finite element software. For this recondition, the PM at the outer section become stationary hence, retaining sleeve can be removing. The proposed MG produced 18% higher average torque than the conventional MG with drawback in torque ripple. The proposed CMG also produce higher gear ratio than the same pole pair of conventional CMG.
Volume: 11
Issue: 4
Page: 1731-1736
Publish at: 2020-12-01

An improved method for efficient controlling of the dynamic voltage restorer to enhance the power quality in the distribution system

10.11591/ijpeds.v11.i4.pp1958-1965
Ali Basim Mohammed , Mohd Aifaa Mohd Ariff , Sofia Najwa Ramli
This paper represents a low complexity of the DVR controller by using a robust differentiator named as approximate classical sliding mode differentiator (ACSMD) to overcome the drawback of the linear differentiator. Additionally, utilize a nonlinear sliding variable named arctan function (sigmoid function) in order to keep the magnitude of the load voltage approximately 1pu, the THD at the standard level, improve the robustness property and maintain the steady-state error within a small bound. The most important issues of the power system network are power quality, the major problems of power quality are voltage sag/swell and harmonics which cause tripping or malfunctioning of the equipment. This paper gives an economic and effective solution by utilizing the dynamic voltage restorer to protect the sensitive loads from the disturbances that happened in the system such as voltage sag/swell and harmonics. The proposed system of the DVR is investigated by utilizing MATLAB/Simulink to enhance the disturbances when it occurs in a distribution system. The presents DVR model is evaluated by utilizing some of the popular voltage sag indices.
Volume: 11
Issue: 4
Page: 1958-1965
Publish at: 2020-12-01

Novel technique for hill climbing search to reach maximum power point tracking

10.11591/ijpeds.v11.i4.pp2019-2029
Ahmed Samir Badawi , Nurul Fadzlin Hasbullah , Siti Hajar Yusoff , Aisha H Hashim , Alhareth Zyoud
In this paper, a new technique has been proposed to solve the trade off common problem in hill climbing search algorithm (HCS) to reach maximum power point tracking (MPPT). The main aim of the new technique is to increase the power efficiency for the wind energy conversion system (WECS). The proposed technique has been combined the three-mode algorithm to be simpler. The novel algorithm is increasing the ability to reach the MPPT without delay. The novel algorithm shows fast tracking capability and enhanced stability under change wind speed conditions.
Volume: 11
Issue: 4
Page: 2019-2029
Publish at: 2020-12-01

The algorithm of adaptive control for active suspension systems using pole assign and cascade design method

10.11591/ijra.v9i4.pp271-280
Chi Nguyen Van
This paper presents the active suspension system (ASS) control method using the adaptive cascade control scheme. The control scheme is implemented by two control loops, the inner control loop and outer control loop are designed respectively. The inner control loop uses the pole assignment method in order to move the poles of the original system to desired poles respect to the required performance of the suspension system. To design the controller in the inner loop, the model without the noise caused by the road profile and velocity of the car is used. The outer control loop then designed with an adaptive mechanism calculates the active control force to compensate for the vibrations caused by the road profile and velocity of the car. The control force is determined by the error between states of the reference model and states of suspension systems, the reference model is the model of closed-loop with inner control loop without the noise. The simulation results implemented by using the practice date of the road profile show that the capability of oscillation decrease for ASS is quite efficient.
Volume: 9
Issue: 4
Page: 271-280
Publish at: 2020-12-01
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