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31,456 Article Results

Enhancement of cascaded multi-level VSC STATCOM performance using ANN in the presence of faults

10.11591/ijpeds.v11.i2.pp895-906
Mohamad M Almelian , Izzeldin I Mohd , Abu Zaharin Ahmad , Mohamed A Omran , Mohamed Salem , Awang Jusoh , Tole Sutikno
A system can be disturbed in terms of stability when connected to a number of loads at the distribution ends or when subjected to faults. To reverse such systems to a stable state, FACTS devices such as static synchronous compensator (STATCOM) are used. In this paper, a cascaded multi-level voltage source converter (VSC) STATCOM was designed and implemented with a novel space vector pulse width modulation (SVPWM) scheme. Artificial neural network (ANN) controller was used instead of instead of Proportional-Integral (PI) controller in the proposed scheme to improve the response time (RT) and performance of STATCOM in terms of power factor (PF) and voltage amplitude during periods of voltage sag. During the implementation, two fault sources (single-line-to-ground (SLG) and line-to- line (LL) faults) were used to create voltage sag. STATCOM was subjected to performance evaluation in the presence of these disturbances via MATLAB simulation in IEEE 3-bus system. The outcome of the simulation studies showed the ANN controller to perform better than PI as it was able to rapidly recover voltage value (<1 cycle) with unity PF.
Volume: 11
Issue: 2
Page: 895-906
Publish at: 2020-06-01

Bio-inspired route estimation in cognitive radio networks

10.11591/ijece.v10i3.pp3095-3107
Miguel Tuberquia , Hans Lopez-Chavez , Cesar Hernandez
Cognitive radio is a technique that was originally created for the proper use of the radio electric spectrum due its underuse. A few methods were used to predict the network traffic to determine the occupancy of the spectrum and then use the ‘holes’ between the transmissions of primary users. The goal is to guarantee a complete transmission for the second user while not interrupting the trans-mission of primary users. This study seeks the multifractal generation of traffic for a specific radio electric spectrum as well as a bio-inspired route estimation for secondary users. It uses the MFHW algorithm to generate multifractal traces and two bio-inspired algo-rithms: Ant Colony Optimization and Max Feeding to calculate the secondary user’s path. Multifractal characteristics offer a predic-tion, which is 10% lower in comparison with the original traffic values and a complete transmission for secondary users. In fact, a hybrid strategy combining both bio-inspired algorithms promise a reduction in handoff. The purpose of this research consists on deriving future investigation in the generation of multifractal traffic and a mobility spectrum using bio-inspired algorithms.
Volume: 10
Issue: 3
Page: 3095-3107
Publish at: 2020-06-01

Optimization of wind energy conversion systems – an artificial intelligent approach

10.11591/ijpeds.v11.i2.pp1040-1046
Ying Ying Koay , Jian Ding Tan , Siaw Paw Koh , Kok Hen Chong , Sieh Kiong Tiong , Janaka Ekanayake
The environmentally friendly wind energy conversion system has become one of the most studied branches of sustainable energy. Like many other power generator, maximum power point tracking is an easy yet effective way to boost the efficiency of the conversion system. In this research, a modified Electromagnetism-like Mechanism Algorithm (EM) is proposed for the maximum power point tracking (MPPT) scheme of a micro-wind energy conversion system (WECS). In contrast with the random search steps used in a conventional EM, modified EM is enhanced with a Split, Probe, and Compare (SPC-EM) feature which ensures solutions with higher accuracies quicker by not having to scrutinize the search in details at the beginning stages of the iterations. Experiments and simulations are carried to test the SPC-EM in tracking the maximum power point under different wind profiles. Results indicate that the performance of the modified EM showed significant improvement over the conventional EM in the benchmarking. It can thus be concluded that based on the simulations, the SPC-EM performs well as an MPPT scheme in a micro-WECS.
Volume: 11
Issue: 2
Page: 1040-1046
Publish at: 2020-06-01

CPW fed SRR loaded monopole antenna for triple band operations

10.11591/ijece.v10i3.pp3145-3151
Smitha K. M. , Aju John K. K. , Thomaskutty Mathew
A planar CPW fed SRR loaded monopole antenna based on split ring resonator with triple-band operations is reported for passive UHF RFID, Wireless Local Area Networks (WLAN) and World Interoperability for Microwave Access (WiMAX) applications. Measured and simulated results show the effect of tapering of the SRR layer on bandwidth improvement and gain enhancement in comparison to monopole with SRR antenna. The CPW fed SRR loaded monopole antenna has a bidirectional pattern with high gain for wireless communication applications.
Volume: 10
Issue: 3
Page: 3145-3151
Publish at: 2020-06-01

Convolutional recurrent neural network with template based representation for complex question answering

10.11591/ijece.v10i3.pp2710-2718
A. Chandra Obula Reddy , K. Madhavi
Complex Question answering system is developed to answer different types of questions accurately. Initially the question from the natural language is transformed to an internal representation which captures the semantics and intent of the question. In the proposed work, internal representation is provided with templates instead of using synonyms or keywords. Then for each internal representation, it is mapped to relevant query against the knowledge base. In present work, the Template representation based Convolutional Recurrent Neural Network (T-CRNN) is proposed for selecting answer in Complex Question Answering (CQA) framework. Recurrent neural network is used to obtain the exact correlation between answers and questions and the semantic matching among the collection of answers. Initially, the process of learning is accomplished through Convolutional Neural Network (CNN) which represents the questions and answers separately. Then the representation with fixed length is produced for each question with the help of fully connected neural network. In order to design the semantic matching between the answers, the representation of Question Answer (QA) pair is given into the Recurrent Neural Network (RNN). Finally, for the given question, the correctly correlated answers are identified with the softmax classifier.
Volume: 10
Issue: 3
Page: 2710-2718
Publish at: 2020-06-01

Control of PMSG based variable speed wind energy conversion system connected to the grid with PI and ADRC approach

10.11591/ijpeds.v11.i2.pp953-968
Youssef Barradi , Khalida Zazi , Malika Zazi , Naoufel Khaldi
This paper presents the modeling and simulation of wind energy Conversion System using the Permanent Magnet Synchronous Generator (PMSG). The objectives are: to extract the maximum power of the wind speed by controlling the electromagnetic torque of the PMSG, to maintain constant the DC-link voltage despite the wind speed variations and to attain the unity power factor. In order to ensure a regulation with high performance and a good robustness against the internal and the external disturbances, a new control strategy called the Active Disturbance Rejection Control (ADRC) is used. Therefore, the Analysis and simulation of the ADRC and PI controllers are developed with MATLAB/Simulink software. The performance of these controllers is compared in term of references tracking, robustness and grid faults.
Volume: 11
Issue: 2
Page: 953-968
Publish at: 2020-06-01

Algorithm development and hardware implementation for medical image compression system: a review

10.11591/ijeecs.v18.i3.pp1331-1341
Noor Huda Ja’afar , Afandi Ahmad
In the high-tech world, medical imaging is very important to diagnose and analyze illness inside human body. The increasing number of patients annually has continuously growth the amount of medical imaging data generated and directly causes a demand for data storage. Generally, medical images are rich with data, where these data are important for diagnosing purpose. However, some of the data represents redundant information and sometimes can be discarded. Thus, the research area on medical image compression dealing with three-dimensional (3-D) modalities need to be given more attention and exploration. The algorithm development using wavelet transform with software implementation are the famous topics explored among researchers, whilst fewer works have been done in utilizing curvelet transform in medical image compression. Along with that, very limited hardware implementation of 3-D medical image compression is discovered. In term of performance evaluation, most of the previous works conducted objective test compared with subjective test. To fill in this gap, medical image compression system will be reviewed, with the aim to identify the recent method used in medical image compression system. This paper thoroughly scrutinizes the recent advances in medical image compression mainly in terms of compression method, algorithm development with software and hardware implementations and performance evaluation. In conclusion, the overall picture of the medical image compression landscape, where most of the researchers more focused on algorithm development or software implementations without having the combination of software and hardware implementations.
Volume: 18
Issue: 3
Page: 1331-1341
Publish at: 2020-06-01

Photovoltaic emulator of different solar array configurations under partial shading conditions using damping injection controller

10.11591/ijpeds.v11.i2.pp1019-1030
Mustapha Alaoui , Hattab Maker , Azeddine Mouhsen , Hicham Hihi
In the last decades, researchers and scientists have been trending towards photovoltaic (PV) solar energy research as one of the noteworthy renewable energies. As a matter of fact, the need for a laboratory system devoted to performing measurements and experimentation on PV systems is being increased. The PV array emulator is designed to accomplish this task by reproducing accurately the electrical behavior of real PV sources. The present paper proposes thus a new control and design of PV array emulators. It is based essentially on a hybrid Damping Injection controller. The proposed control strategy circumvents obviously the existing PV emulator's limitations in terms of accuracy, speed and partial shading emulation. Several results are given and discussed to show the efficiency of the proposed system to emulate PV modules and different PV array configurations under uniform solar irradiance and partial shading conditions.
Volume: 11
Issue: 2
Page: 1019-1030
Publish at: 2020-06-01

Students’ opinions about teaching of the controversial topics in the social studies classes

10.11591/ijere.v9i2.20446
Kamil Uygun , Ibrahim Ethem Arslan
The aim of this study is to determine middle school 7th grade students’ opinions on controversial issues. In the research, screening model and quantitative research method has been used. The sample of the study consists of 7th graders from 5 public schools located on the center of Demirci district of Manisa province. The 5-point Likert-type questionnaire prepared with 20 items has been applied to 203 students. The data has been put into the statistical program and analyzed. By determining means, deviations and frequencies of all items in the survey, it has been tabulated and interpreted separately. “Mann Whitney U” and Kruskal Wallis H” tests have been used to find out whether the students' opinions about which subjects can be discussed in the classroom, shows significant difference according to various variables or not. Interpretation of the results has been done by the significance level of 0,5. According to the findings of the research, the topics that the students want to discuss the most in the classroom respectively are human rights, multiculturalism, election system, animal rights and freedom of the press. The topics that the students do not want to discuss in the classroom are terror and violence. When the results of the research has been examined according to various variables; Significant differences has been seen in different items, such as; The Gender (Military System, Religious Communities, Fanaticism and Cloning), Reading Books (TV Broadcasts), The Education of Father (Religious Communities, Multiculturalism), The Education of Mother (Military System, Religious Communities and Cloning), Father’s Profession (Religious Communities, Fanaticism, Internet and Elections System), Mother's Profession (Religious Communities) and Family Income Status (Internet).
Volume: 9
Issue: 2
Page: 335-344
Publish at: 2020-06-01

Design and analysis of controllers for high voltage gain DC-DC converter for PV panel

10.11591/ijpeds.v11.i2.pp594-604
S. Nagaraj , R. Ranihemamalini , L. Rajaji
Bidirectional high gain DC-DC buck boost converter is a virtual interface among PV source and inverter fed motor drive. In this article, a PV panel integrating a non-isolated bidirectional DC/DC converter that has high voltage gain voltage and a 3 phase three level DC/AC inverter is projected. It highlights the comparison between proportional integral controller (PIC), fractional order proportional integral derivative Controller (FOPIDC) and fuzzy logic controller (FLC) based Bidirectional DC/DC Power Converter System (BDDPCS). The design, model and simulation using SIMULINK of open loop BDDPCS and closed loop PIC, FOPIDC and FLC based BDDPCS are done and the results are discussed. The findings indicate higher performance for FLC based control of BDDPCS. The proposed BDDPCS has merits such as bidirectional power transferability, lesser hardware count with enhanced dynamic response. The hardware of BDDPCS is tested and the experiment result is compared in association with simulation results.
Volume: 11
Issue: 2
Page: 594-604
Publish at: 2020-06-01

Ca[Mg3SiN4]Ce3+ phosphor: effect of particle concentration on lighting properties of the 7000K IPW-LEDs

10.11591/ijpeds.v11.i2.pp566-570
Q. S. Vu , Tang Tin Dao , Minh Tran
Nowadays, the white-light-emitting diodes (LEDs) have a vast application on the real-life based on its superior advantages such as energy efficiency, long lifetime, compactness, and environment-friendly and designable features in comparison with incandescent and fluorescent lamps. In this paper, we co-doping the Ca[Mg3SiN4]Ce3+ Phosphor on the phosphor compound of the 7000K In-cup Packaging White LEDs (IPW-LEDs) for improving the lighting properties. By varying the concentration of Ca[Mg3SiN4]Ce3+ Phosphor from 0% to 1.8%, the effect of the Ca[Mg3SiN4]Ce3+ Phosphor on the D-CCT, CRI, CQS, and LO of the 7000K IPW-LEDs are investigated. Using the Light Tool and software, the research results show that the concentration of the IPW-LEDs has a massive influence on the lighting properties of the 7000K IPW-LEDs. All the results are convinced by Light Tool simulation.
Volume: 11
Issue: 2
Page: 566-570
Publish at: 2020-06-01

Critical perspective of English teaching and learning in Turkey

10.11591/ijere.v9i2.20469
Omer Gokhan Ulum , Kutay Uzun
GTM (Grammar Translation Method) is still the commonly utilized method in EFL classes in Turkish Education System. Based on a phenomenographic research design, this paper inquires the personal constructs of EFL state school teachers (n= 15) on the related issue. There in lies the major result in that non-native EFL teachers, who have learnt English totally via GTM, teaches it via GTM as well. Implications are provided to overcome this vicious circle.
Volume: 9
Issue: 2
Page: 456-460
Publish at: 2020-06-01

Biogeography optimization algorithm based next web page prediction using weblog and web content features

10.11591/ijai.v9.i2.pp327-335
Roshan Anant Gangurde , Binod Kumar
Recommendation of web page as per users’ interest is a broad and important area of research. Researcher adopts user behavior from actions present in cookies, logs and search queries. This paper has utilized a prior webpage fetching model using web page prediction. For this purpose, web content in form of text and weblog features are analyzed. As per dynamic user behavior, proposed model LWPP-BOA (Logistic Web Page Prediction By Biogeography Optimization Algorithm) predict page by using genetic algorithm. Based on user actions, weblog feature are developed in form of association rules, while web content gives a set of relevant text patterns. Page prediction as per random user behavior is enhanced by means of Biogeography Optimization Algorithm where crossover operation is performed as per immigration and emigration values. Here population updation depends on other parameters of chromosome except fitness value. Experiments are conducted on real dataset having web content and weblogs. Results are compared using precision, coverage, M-Metric, MAE and RMSE parameters and it indicates that the proposed work is better than other approaches already in use.
Volume: 9
Issue: 2
Page: 327-335
Publish at: 2020-06-01

Performance enhancement of solar powered floating photovoltaic system using arduino approach

10.11591/ijpeds.v11.i2.pp651-657
Nur Amirah Abdul Jamil , Siti Amely Jumaat , Suriana Salimin , Mohd Noor Abdullah , Ahmad Fateh Mohamad Nor
This paper presents Performance Enhancement of Solar Powered Floating Photovoltaic System using Arduino Approach. In the project, an Arduino nano as a main controller of the system. The objective of this project to monitor performance of the voltage, current and power output respectively. Furthermore, the prototype of the research is testing in two conditions: on water surface and on a land area. Based on the results, the power of the photovoltaic on the water surface is increased compared on the land area. The conclusion for this project is it can generate electricity using floating photovoltaic and the same time to monitor output of the system.
Volume: 11
Issue: 2
Page: 651-657
Publish at: 2020-06-01

Computer-based solar tracking system for PV energy yield improvement

10.11591/ijpeds.v11.i2.pp743-751
Rini Nur Hasanah , Aditya Bagus Setyawan , Eka Maulana , Tri Nurwati , Taufik Taufik
Electric energy is the main driver of various daily activities, both to increase productivity as well as to improve life quality. Energy demand is continuously increasing in parallel to the progress in technology and population growth. Depletion of fossil energy sources and awareness of environmental protection make people resort to renewable energy sources like solar energy. Low efficiency and intermittent characteristic of solar energy may originate from the sun movement along the day as well as the year. Efforts have always been tried to deal with the drawbacks. This paper proposes a computer-based tracking system to fully monitor and control a solar panel movement. The designed system has proven a good performance of working at certain time intervals, either hourly, or even continuously, as desired. Energy yield improvement has been achieved by processing the tracking results with the help of a microcontroller to optimize the power generation of the solar panel.
Volume: 11
Issue: 2
Page: 743-751
Publish at: 2020-06-01
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