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29,922 Article Results

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

Performance investigation of stand-alone induction generator based on STATCOM for wind power application

10.11591/ijece.v10i6.pp5570-5578
Ahmed J. Ali , Mohammed Y. Suliman , Laith A. Khalaf , Nashwan S. Sultan
Self-Excited induction generators (SEIG) display a low voltage and frequency regulation due to variable applied load and input rotation speed. Current work presents a simulation and performance analysis of a three-phase wind-driven, SEIG connect to a three-phase load. In addition, an investigation of the dynamic operation of the induction generator from starting steady state until no-load operation. It is assumed that the input mechanical power is constant where the rotor of the SEIG rotates at a constant speed. The value of the excitation capacitance which is necessary to the operation of the induction generator also computed to ensure a smooth and self-excitation starting. The output voltage of the generator is adjusted by varying the reactive power injected by STATCOM. A 3-phase IGBT voltage source inverter with a fuel cell input supply is connected as STATCOM which is used to compensate for the reduction in the supply voltage and its frequency due to variation occurred in the applied loads. This work includes introducing a neuro-fuzzyy logic controller to enhance the performance of the SEIG by regulation the generated voltage and frequency The dynamic model of SEIG with STATCOM and loads are implemented using MATLAB/SIMULINK
Volume: 10
Issue: 6
Page: 5570-5578
Publish at: 2020-12-01

Robust maximum power point tracking control for photovoltaic system based on second order sliding-mode

10.11591/ijape.v9.i3.pp284-296
A. Fezzani , N. Bouarroudj , S. Drid , L. Zaghba
This paper proposes a control approach of a maximum power point of a photovoltaic (PV) system using the second order sliding mode approach. The main objective of the proposed paper is to track the maximum power point (MPP) using super twisting algorithm (STA) with a one-loop control method and augment efficiency of the output power system. The structure of a proposed approach is simple and robust aging the atmospheric changes. Such control approach solution has several advantages such as simple implementation, robustness; reduce the chattering phenomenon and good dynamic response compared to traditional first-order sliding mode control algorithm. The controller circuit adapts the duty cycle of the switch electronic device of the DC/DC converter to search maximum power point tracking as a function of evolution of the power input. The effectiveness and feasibility of the proposed control are verified by simulation in MATLAB/Simulink environment and dSPACE-based hardware in loop platform.
Volume: 9
Issue: 3
Page: 284-296
Publish at: 2020-12-01

Exploring STEAM teaching in preschool using Fred Rogers approach

10.11591/ijere.v9i4.20674
Zahiroh Awang , Nooraida Yakob , Aswati Hamzah , Mohd Mernan Talling
The culture of Science, Technology, Engineering, Art and Mathematics (STEAM) teaching is still new among preschool teachers. Nevertheless, STEAM teaching is seen as challenging to be implemented if there is no clear guideline prepared by qualified experts. Therefore, a need analysis on STEAM teaching strategies ought to be conducted to ensure the implementation of STEAM teaching its related problems may be attended. This research aimed to explore experts’ perceptions about Fred Rogers’ STEAM as a STEAM teaching strategy approach as a considered method to be taught in preschools. This need analysis employed semi structured interviews with four experts. The obtained findings were categorized and analysed thematically. Five themes were identified: 1) features and needs of STEAM education, 2) inquiry-based learning 3) learning by doing activities, 4) interesting and systematic teaching strategies and 5) suitability with children’ development and practices. The research findings benefit preschool teachers in selecting and implementing STEAM teaching strategies based on experts’ opinion. Besides, it is anticipated to help teachers to conduct meaningful and effective STEAM teaching with preschool children.
Volume: 9
Issue: 4
Page: 1071-1078
Publish at: 2020-12-01

The urgency of religious and cultural science in STEM education: A meta data analysis

10.11591/ijere.v9i4.20462
Woro Sumarni , Zulfatul Faizah , Bambang Subali , W. Wiyanto , Ellianawati Ellianawati
The 21st century education engages students to have higher order thinking and scientific literacy skills. However, these abilities in Indonsia are still relatively low, especially student’s scientific literacy skills. One solution to the problem of low scientific literacy skills in Indonesia is the application of STEM education. However, as technology advances pursued in STEM education, religious and cultural sciences increasingly separate themselves from science. Cultural science is rarely implemented in learning so that many students do not know their own culture. The contra between science and religion also makes students’s perception of religion and science are two independent knowledge and cannot be united. Through literature studies that have been carried out from various journal article search sites, this article discusses how important religious and cultural sciences are to be implemented into STEM education. The relationship between religion and science, culture and science, culture and religion and the urgency of religion and culture in STEM education are also discussed in this article. The results of this study propose solutions so that science education can be implemented with RE-STEM learning to overcome the gap between religion, culture and science. So, that students will have a more balanced knowledge in religion, ethnoscience and science from RE-STEM integration.
Volume: 9
Issue: 4
Page: 1045-1054
Publish at: 2020-12-01

Control DC link of single-phase dynamic voltage restorer

10.11591/ijape.v9.i3.pp297-304
Toumi Toufik , Allali Ahmed , Abdelkhalek Othmane , Soumeur Mohammed Amine , Nasri Abdelfatah
This paper is aimed to illustrate and expose the performance of single-phase voltage dynamic voltage restorer (DVR) control connected to the electrical distribution grid. This performance is easily expressed by compensating for the sags and the swells voltages, and regulating the voltage across the load by injecting a voltage component in series with the source voltage increased or decreased with respect to the source voltage the load-side waveforms are purely sinusoidal. The integration of serial and chopper converters makes the DVR capable of bidirectional power flow. The key to this topology is its ability to compensate for sagging and swelling of the voltage in the long run. The modeling of the DVR and the design of its controller is included in this document. Effectiveness of control systems and start-up sequence of DVR operation is verified by detailed simulation studies. The control method used in this work is based on the use of a booster chopper and two cascade loopsto generate the PWM command to control the chopper. The effectivenessof the suggested method is confirmed by the MATLAB/SIMULINK® simulation results and some prototype experiments. These results showthe capacity of the proposed DC link control.
Volume: 9
Issue: 3
Page: 297-304
Publish at: 2020-12-01

Question-led approach in designing Dijkstra algorithm game-based learning: A pilot study

10.11591/ijere.v9i4.20651
Rosni Binti Ramle , D’oria Islamiah Rosli , Shelena Soosay Nathan , Mazniha Berahim
Dijkstra algorithm is important to be understood because of its many uses. However, understanding it is challenging. Various methods to teach and learn had been researched, with mixed results. The study proposes questionled approach of the algorithm in a game-based learning context. The game designed based on an existing game model, developed and tested by students. Pre- and post-game tests compared and game feedback survey analysed. Results showed that students’ performance in graph data structure Dijkstra algorithm improved after playing the game where post-test mark was higher than pre-test. Game feedback were mostly positive, with areas of improvement. Students may use the game as a learning tool for self-regulated learning. Educators may get some ideas on how to design teaching tool using question-led approach.
Volume: 9
Issue: 4
Page: 926-933
Publish at: 2020-12-01

Radial basis function neural network control for parallel spatial robot

10.12928/telkomnika.v18i6.14913
Nguyen Hong; Thai Nguyen University of Technology Quang , Nguyen Van; Hanoi University of Science and Technology Quyen , Nguyen Nhu; Thai Nguyen University of Technology Hien
The derivation of motion equations of constrained spatial multibody system is an important problem of dynamics and control of parallel robots. The paper firstly presents an overview of the calculating the torque of the driving stages of the parallel robots using Kronecker product. The main content of this paper is to derive the inverse dynamics controllers based on the radial basis function (RBF) neural network control law for parallel robot manipulators. Finally,  numerical simulation of the inverse dynamics controller for a 3-RRR delta robot manipulator is presented as an illustrative example.
Volume: 18
Issue: 6
Page: 3191-3201
Publish at: 2020-12-01

Spectral opportunity selection based on the hybrid algorithm AHP-ELECTRE

10.12928/telkomnika.v18i6.16372
Carlos; Universidad Distrital Francisco José de Caldas Perdomo , Cesar; Universidad Distrital Francisco José de Caldas Hernandez , Diego; Universidad Distrital Francisco José de Caldas Giral
Due to an ever-growing demand for spectrum and the fast-paced developmentof wireless applications, technologies such as cognitive radio enablethe efficient use of the spectrum. The objective of the present article is todesign an algorithm capable of choosing the best channel for data transmission.It uses quantitative methods that can modify behavior by changing qualityparameters in the channel. To achieve this task, a hybrid decision-makingalgorithm is designed that combinesanalytical hierarchy process(AHP)algorithms and adjusts the weights of each channel parameter, using a prioritytable. TheElimination Et Choix Tranduisant La Realité(ELECTRE)algorithm processes the information from each channel through a weightmatrix and then delivers the most favorable result for the transmitted data. Theresults reveal that the hybrid AHP-ELECTRE algorithm has a suitableperformance, which improves the throughput rate by 14% compared to similaralternatives.
Volume: 18
Issue: 6
Page: 2815-2821
Publish at: 2020-12-01

Design and implementation of fast and highly precise water magnetizer

10.12928/telkomnika.v18i6.15916
Mohammed A.; Middle Technical University Mohammed , Ahmed J.; Middle Technical University Abid
In the last decades, researchers have widely discussed the effects of magnetized water on many biological and industrial aspects; many studies have also examined the effects of magnetization on water physical and chemical properties and shown a slight increase in the water pH level for the drinking water after magnetizations. This article presents a new practical model to magnetize the tap drinking water with permanent, and adjustable magnets to ensure fast and precise results. A new smart system is designed and implemented to calculate the required magnetic flux density, and the exposuretime based on the difference in the measured pH level of the water atthe inletand outlet pipes.Three permanent magnets, with magnetic flux densities of 500, 1000, and 1500 Gauss (G), are installed at different pipe routes, with added to a variable magnet on the main water outlet. The results show a promising prototype that is not only processing the water efficiently but also supply much data about the water properties, which can be led to more findingsin this field.
Volume: 18
Issue: 6
Page: 3155-3163
Publish at: 2020-12-01

Implementation of a grid-tied emergency back-up power supply for medium and low power application

10.11591/ijece.v10i6.pp6233-6243
Dhiman Chowdhury , Mohammad Sharif Miah , Md. Feroz Hossain , Uzzal Sarker
Emergency back-up power supply units are necessary in case of grid power shortage, considerably poor regulation and costly establishment of a power system facility. In this regard, power electronic converters based systems emerge as consistent, = properly controlled and inexpensive electrical energy providers. This paper presents an implemented design of a grid-tied emergency back-up power supply for medium and low power applications. There are a rectifier-link boost derived DC-DC battery charging circuit and a 4-switch push-pull power inverter (DC-AC) circuit, which are controlled by pulse width modulation (PWM) signals. A changeover relay based transfer switch controls the power flow towards the utility loads. During off-grid situations, loads are fed power by the proposed system and during on-grid situations, battery is charged by an AC-link rectifier-fed boost converter. Charging phenomenon of the battery is controlled by a relay switched protection circuit. Laboratory experiments are carried out extensively for different loads. Power quality assessments along with back-up durations are recorded and analyzed. In addition, a cost allocation affirms the economic feasibility of the proposed framework in case of reasonable consumer applications. The test-bed results corroborate the reliability of the research work.
Volume: 10
Issue: 6
Page: 6233-6243
Publish at: 2020-12-01

Integrated arrangement of advanced power electronics through hybrid smart grid system

10.12928/telkomnika.v18i6.13433
Nelly; Politeknik Negeri Lhokseumawe Safitri , A. M. Shiddiq; Politeknik Negeri Ujung Pandang Yunus , Fauzi; Politeknik Negeri Lhokseumawe Fauzi , Naziruddin; Politeknik Negeri Lhokseumawe Naziruddin
As an enabler component for renewable energy integration, power electronics (PE) technology in smart grid system is one of the most important issues of development the electrification, decentralization and information-technology/operation-technology (IT/OT) digitization within the electrical energy transmission and distribution systems. The arrangement of PE may different along the feeder either for grid-connected photovoltaic (PV), wind turbine, fuel cells, wave energy system and battery storage unit, respectively.This is due to the electric voltage that might need to be converted from alternating current (AC) to direct current (DC) and vice versa. For that reason, this paper proposed a concept of advanced PE as an integrated arrangement of several AC/DC/AC-and DC/AC- converters in such ways that support thepreviously mentioned grid-connected hybrid renewable energy sources and distributed generators (DGs) along the distribution feeder. Additionally, for the system that supported by battery storage unit, then this hybrid smart grid concept might become the answer for future utility needs.
Volume: 18
Issue: 6
Page: 3202-3209
Publish at: 2020-12-01

Vein palm recognition model using fusion of features

10.12928/telkomnika.v18i6.16149
Qassim Abd Al-hussain; University of Al-Qadisiyah Hadi
One of the most promising mechanisms in the field of security and information safety is authentication based on palm vein. The main reasons that vein palm becomes an authentication method is because of its distinctive privacy, as it is difficult to manipulate or change its results, because of the location of the vein within the palm. With the use of this technology, it has become easy to maintain data from unauthorized access and unwanted persons. In this work proposed model are suggested that contain four stages to reach the results: in the first stage is the pre-processing stage where histogram equation was used to enhance the image and the properties are shown, the second stage is the extracting the properties where, Gabor filter and 2-discrete wavelet filters are suggested for features extraction, where it is considered one of the most important filters used to extract the features, as well as in the third stage "PCA" are used for data or features reduction, because of its advantages in analyzing the features and reducing the spacing between them. As for the last stage, the Euclidean distance used to measure the spacing. The results were acceptable and convincing, since the similarity ratio 96.2%. These results were obtained after several tests and using the Gabor filter with 2D-discrete wavelet transform and principal component analysis (PCA), I got the best results.
Volume: 18
Issue: 6
Page: 2921-2927
Publish at: 2020-12-01

Robust nonlinear PD controller for ship steering autopilot system based on particle swarm optimization technique

10.11591/ijai.v9.i4.pp662-669
Nihad M. Ameen , Abdulrahim Thiab Humod
This paper proposes a new approach for robust nonlinear proportional derivative (PD) controller. In this approach a nonlinear function (sigmoid) is added to the conventional proportional integral derivative (PID) controller with filtering for the derivative, in order to improve system response and to reduce the effects of the nonlinearity and uncertainty due to variations of hydrodynamic coefficients of ship with the speed. The gains of nonlinear PD controller are tuned by applying particle swarm optimization (PSO) technique. The simulated results by MATLAB program give satisfactory performance with regard to maximum overshoot, settling time and zero steady state error for step, ramp and proposed trajectory as input to the system. The robustness of the autopilot was checked by changing the plant parameters and adding disturbance to the plant input. The used autopilot is nonlinear PD controller because the gain of integral term by PSO is approximately zero which simplifies the controller construction. The results show that the proposed controller has superior transient response and robustness on the conventional PID designed by using symmetrical optimum criterion with pole assignment technique.
Volume: 9
Issue: 4
Page: 662-669
Publish at: 2020-12-01

Harnessing deep learning algorithms to predict software refactoring

10.12928/telkomnika.v18i6.16743
Mamdouh; Prince Sultan University Alenezi , Mohammed; Yarmouk University Akour , Osama; Yarmouk University Al Qasem
During software maintenance, software systems need to be modified by adding or modifying source code. These changes are required to fix errors or adopt new requirements raised by stakeholders or market place. Identifying thetargeted piece of code for refactoring purposes is considered a real challenge for software developers. The whole process of refactoring mainly relies on software developers’ skills and intuition. In this paper, a deep learning algorithm is used to develop a refactoring prediction model for highlighting the classes that require refactoring. More specifically, the gated recurrent unit algorithm is used with proposed pre-processing steps for refactoring predictionat the class level. The effectiveness of the proposed model is evaluated usinga very common dataset of 7 open source java projects. The experiments are conducted before and after balancing the dataset to investigate the influence of data sampling on the performance of the prediction model. The experimental analysis reveals a promising result in the field of code refactoring prediction
Volume: 18
Issue: 6
Page: 2977-2982
Publish at: 2020-12-01
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