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31,456 Article Results

New control scheme for synchronization of a photovoltaic system to a three-phase grid to attenuate the harmonics of currents caused by distorted grid voltage

10.11591/ijape.v9.i3.pp256-266
Ismail Boukhechem , Ahcen Boukadoum , Lahcene Boukelkoul , Houssam Eddine Medouce , Rima Lebied
This study presents a new scheme of control for the synchronization ofa photovoltaic (PV) system with a three-phase grid without a line sensor.The approach of the proposed synchronization technique is developed to extract the maximum of PV energy and inject it in the network for various conditions of voltage, and to ensure that the currents injected into the three-phase network emulate the wished sinusoidal forms even when the mains grid voltage is no longer ideal. This paper introduces a new technique of synchronization and elimination of the disturbances created by the distorted tension based on the direct power control without voltage sensors (VF_DPC) with the help of second-order generalized integrator (SOGI) associated with a self-tuning filter (STF) to extract the fundamental virtual flux. The simulation of the proposed system is realized in MATLAB/Simulink environment.
Volume: 9
Issue: 3
Page: 256-266
Publish at: 2020-12-01

Diminution of factual power loss by enhanced bacterial foraging optimization algorithm

10.11591/ijape.v9.i3.pp245-249
Kanagasabai Lenin
This paper presents an enhanced bacterial foraging optimization (EBFO)algorithm for solving the optimal reactive power problem. Bacterial foraging optimization is based on foraging behaviour of Escherichia coli bacteria which present in the human intestine. Bacteria have inclination to congregate the nutrient-rich areas by an action called as Chemo taxis. The bacterial foraging process consists of four chronological methods i.e. chemo taxis, swarming and reproduction and elimination-dispersal. In this work rotation angle adaptively and incessantly modernized, which augment the diversity of the population and progress the global search capability. The quantum rotation gate is utilized for chemo taxis to modernize the state of chromosome projected EBFO algorithm has been tested in standard IEEE 14,300 bus test system and simulation results show the projected algorithm reduced the real power loss extensively.
Volume: 9
Issue: 3
Page: 245-249
Publish at: 2020-12-01

A systematic review of text classification research based on deep learning models in Arabic language

10.11591/ijece.v10i6.pp6629-6643
Ahlam Wahdan , Sendeyah AL Hantoobi , Said A. Salloum , Khaled Shaalan
Classifying or categorizing texts is the process by which documents are classified into groups by subject, title, author, etc. This paper undertakes a systematic review of the latest research in the field of the classification of Arabic texts. Several machine learning techniques can be used for text classification, but we have focused only on the recent trend of neural network algorithms. In this paper, the concept of classifying texts and classification processes are reviewed. Deep learning techniques in classification and its type are discussed in this paper as well. Neural networks of various types, namely, RNN, CNN, FFNN, and LSTM, are identified as the subject of study. Through systematic study, 12 research papers related to the field of the classification of Arabic texts using neural networks are obtained: for each paper the methodology for each type of neural network and the accuracy ration for each type is determined. The evaluation criteria used in the algorithms of different neural network types and how they play a large role in the highly accurate classification of Arabic texts are discussed. Our results provide some findings regarding how deep learning models can be used to improve text classification research in Arabic language.
Volume: 10
Issue: 6
Page: 6629-6643
Publish at: 2020-12-01

Effect of renewable energy sources integration on the optimal coordination of directional over-current relays in distribution system

10.11591/ijape.v9.i3.pp250-255
Lazhar Bougouffa , Abdelaziz Chaghi
The demand for power electricity is growing fast and one of the main tasks for power engineers is to generate electricity from renewable energy sources (RES). Nevertheless, problems arise when the new generation is integrated in the power distribution network. Under this condition, the main purpose in this paper, an investigation of the effect of RES integration on the optimal coordination of directional over-current relays in distribution system, a dual simplex optimization algorithm has been presented to determine the coordination of directional over-current relays (DOCRs). The system used to check the efficiency of the optimization algorithm which is IEEE 33-bus models. The analysis is performed in MATLAB software environment.
Volume: 9
Issue: 3
Page: 250-255
Publish at: 2020-12-01

Identification of interstitial lung diseases using deep learning

10.11591/ijece.v10i6.pp6283-6291
Nidhin Raju , Anita H. B. , Peter Augustine
The advanced medical imaging provides various advantages to both the patients and the healthcare providers. Medical Imaging truly helps the doctor to determine the inconveniences in a human body and empowers them to make better choices. Deep learning has an important role in the medical field especially for medical image analysis today. It is an advanced technique in the machine learning concept which can be used to get efficient output than using any other previous techniques. In the anticipated work deep learning is used to find the presence of interstitial lung diseases (ILD) by analyzing high-resolution computed tomography (HRCT) images and identifying the ILD category. The efficiency of the diagnosis of ILD through clinical history is less than 20%. Currently, an open chest biopsy is the best way of confirming the presence of ILD. HRCT images can be used effectively to avoid open chest biopsy and improve accuracy. In this proposed work multi-label classification is done for 17 different categories of ILD. The average accuracy of 95% is obtained by extracting features with the help of a convolutional neural network (CNN) architecture called SmallerVGGNet.
Volume: 10
Issue: 6
Page: 6283-6291
Publish at: 2020-12-01

Optimization with excess electricity management of a PV, energy storage and diesel generator hybrid system using HOMER Pro software

10.11591/ijape.v9.i3.pp267-283
Aysar Yasin , Mohammed Alsayed
In this research, a standalone microgrid power system is proposed to electrify a small agricultural community in Palestinian territories. The load includes residential load and water pumping load. The community comprises about 30 households with some service buildings in addition to the water pumping system. The average load energy demand is 300kWh/day and the average power demand is 12.5kW, in the same context, the average energy demand for water pumping is 49kWh/day. The region has abundant solar radiation potential with a daily average of 5.4 kWh/m2. The optimum design was achieved using the HOMER Pro software. It took into consideration real incident solar radiation data, electrical demand profile for the community and water pumping system and market cost of all equipment. The optimization results showed that the best hybrid system among all feasible configurations is a PV system with an energy storage system combined with a diesel generator. The net present cost of the system is USD636,150 and the cost of energy (COE) produced is USD0.438/kWh. Sensitivity analysis is considered to study the impact of variations in PV cost, diesel fuel price, and maximum annual capacity shortages (MACS), the results showed that MACS has no effects. Energy management procedure is followed to reduce the excess electricity from 10.6% to 6.24% which in turn reduces the COE from 0.438 to USD 0.416/kWh.
Volume: 9
Issue: 3
Page: 267-283
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

Enhance the chromatic uniformity and luminous efficiency of WLEDs with triple-layer remote phosphor structures

10.11591/ijece.v10i6.pp6244-6250
Nguyen Thi Phuong Loan , Anh Tuan Le
The angular color uniformity (ACU) with the ability to evaluate chromatic performance of WLED has become an important target to achieve in producing higher-quality WLEDs. This paper studies the ACU enhancing effects of novel triple-phosphor configuration in lighting devices with remote phosphor structure. Moreover, the optical influences of remote phosphor structure with three phosphor layers (TL) on WLEDs properties are calculated and compared to the dual-layer (DL) one for reference. The experiments are applied to devices at 5 distinct correlated color temperature ranging from 5600-8500 K. The results presented that DL structure attains better color rendering index (CRI) than the TL one. Meanwhile, in terms of color quality scales (CQS), TL model shows higher values at all ACCTs, compared to the DL. Moreover, the luminous flux of DL configuration is lower than that of TL structure. In addition, the diversion of color temperature depicts as D-CCT in TL structure is much better than the value in DL structure, especially at high ACCT as 8500 K, which means TL is good for chromatic uniformity of high ACCTs WLEDs. These results proved that the triple-layer structure is superior and more effective to apply for acquiring the enhancement of WLEDs package.
Volume: 10
Issue: 6
Page: 6244-6250
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

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

A native enhanced elastic extension tables multi-tenant database

10.11591/ijece.v10i6.pp6618-6628
Magy El Banhawy , Walaa Saber , Fathy Amer
A fundamental factor of digital image compression is the conversion processes. The intention of this process is to understand the shape of an image and to modify the digital image to a grayscale configuration where the encoding of the compression technique is operational. This article focuses on an investigation of compression algorithms for images with artistic effects. A key component in image compression is how to effectively preserve the original quality of images. Image compression is to condense by lessening the redundant data of images in order that they are transformed cost-effectively. The common techniques include discrete cosine transform (DCT), fast Fourier transform (FFT), and shifted FFT (SFFT). Experimental results point out compression ratio between original RGB images and grayscale images, as well as comparison. The superior algorithm improving a shape comprehension for images with grahic effect is SFFT technique.
Volume: 10
Issue: 6
Page: 6618-6628
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

Perceptions and experiences of students on the use of interactive online learning technologies in Mauritius

10.11591/ijere.v9i4.20692
Parmeswar Ramkissoon , Louis Jinot Belle , Trishnee Bhurosy
With the advent of e-learning, advocates use the term interactivity instead of interaction among students, and between the teacher and the students. Many universities use Moodle for online teaching and learning. This paper explores the perceptions and experiences of students in three Higher Education Institutions (HEIs) in Mauritius. A mixed-methods approach was used, with an online survey questionnaire administered to 600 students and focus group discussions were conducted with 15 students from these institutions. It was found that 68.4% of respondents used WhatsApp compared to only 23.6% of them who used the e-learning platform, Moodle. There were no associations between the use or frequency of using WhatsApp or Facebook and the types of HEI to which the students belonged. Students preferred WhatsApp due to its facility for knowledge sharing and construction, its interactivity, its usability, respect for privacy and instant communication. From the findings, it is recommended that HEIs bring a shift in their approaches to teaching and learning from cognitivism to socio-constructivism, connectivism and heutagogy.
Volume: 9
Issue: 4
Page: 833-839
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

Ontology-based context-sensitive software security knowledge management modeling

10.11591/ijece.v10i6.pp6507-6520
Mamdouh Alenezi
The disconcerting increase in the number of security attacks on software calls for an imminent need for including secure development practices within the software development life cycle. The software security management system has received considerable attention lately and various efforts have been made in this direction. However, security is usually only considered in the early stages of the development of software. Thus, this leads to stating other vulnerabilities from a security perspective. Moreover, despite the abundance of security knowledge available online and in books, the systems that are being developed are seldom sufficiently secure. In this paper, we have highlighted the need for including application context sensitive modeling within a case-based software security management system. Furthermore, we have taken the context-driven and ontology-based frameworks and prioritized their attributes according to their weights which were achieved by using the Fuzzy AHP methodology.
Volume: 10
Issue: 6
Page: 6507-6520
Publish at: 2020-12-01
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