Articles

Access the latest knowledge in applied science, electrical engineering, computer science and information technology, education, and health.

Filter Icon

Filters article

Years

FAQ Arrow
0
0

Source Title

FAQ Arrow

Authors

FAQ Arrow

29,922 Article Results

Wireless charging scheme for medium power range application systems

10.11591/ijpeds.v11.i4.pp1979-1986
D Karthikeyan , Sayon Koley , Mayukh Bagchi , Avijit Bhattacharya , K Vijayakumar
Wireless power transmission (WPT) has attracted a wide variety of subjects in various disciplines and has also become a highly active research field due to its capacity to facilitate charging systems. Wireless power transmission will be compulsory to use soon as this technology enables electrical energy to be transmitted from a power source to an electrical load over an air gap without connecting wires. Wireless power transmission has been developed in the low power (1W to 10W) and high power (100W-500W) region. While the low power region development focuses on powering medical transplants and mobile charging, the higher end of the power spectrum is being developed for the electric vehicle (EV) applications. However medium power range (10W to 100W) is relatively unexplored due to lack of proper applications. The commercial WPT scheme is mainly used for the charging of lithium-ion batteries. Sensitive medium power loads like Lithium Polymer (LiPo) batteries do not have a wireless modular charging system. This paper discusses a proposed scheme for wireless charging of medium-range loads. LiPo batteries are used as the targeted charging load. A minimalistic approach has been considered while designing the electronics for efficiency improvement and a compact, modular scheme. The proposed scheme has been developed for drone and robotics applications and the results are validated.
Volume: 11
Issue: 4
Page: 1979-1986
Publish at: 2020-12-01

An approach for enhancing data confidentiality in Hadoop

10.11591/ijeecs.v20.i3.pp1547-1555
Shahab Wahhab Kareem , Raghad Zuhair Yousif , Shadan Mohammed Jihad Abdalwahid
The amount of data processed and stored in the cloud is growing dramatically. The traditional storage devices at both hardware and software levels cannot meet the requirement of the cloud. This fact motivates the need for a platform which can handle this problem. Hadoop is a deployed platform proposed to overcome this big data problem which often uses MapReduce architecture to process vast amounts of data of the cloud system. Hadoop has no strategy to assure the safety and confidentiality of the files saved inside the Hadoop distributed File system(HDFS). In the cloud, the protection of sensitive data is a critical issue in which data encryption schemes plays avital rule. This research proposes a hybrid system between two well-known asymmetric key cryptosystems (RSA, and Paillier) to encrypt the files stored in HDFS. Thus before saving data in HDFS, the proposed cryptosystem is utilized for encrypting the data. Each user of the cloud might upload files in two ways, non-safe or secure. The hybrid system shows higher computational complexity and less latency in comparison to the RSA cryptosystem alone.
Volume: 20
Issue: 3
Page: 1547-1555
Publish at: 2020-12-01

New hybrid flower pollination algorithm with dragonfly algorithm and jaccard index to enhance solving university course timetable problem

10.11591/ijeecs.v20.i3.pp1556-1568
Ma. Shiela C. Sapul , Rachsuda Setthawong , Pisal Setthawong
University course timetable problem (UCTP) is one of the problems on which many researches have been conducted over the years because of its importance in academic institutions. A nature-inspired metaheuristic optimization algorithm, flower pollination algorithm (FPA) has been adapted, so-called adapted FPA (AFPA), to cope with UCTP in the previous work. However, AFPA suffers from the stagnation problem because of the non-diversity in the population. To improve the diversity of the population, this work introduces new Hybrid FPA with two variants: JFPA provided the Jaccard index to determine similarities among categorical data and the greedy selection mechanism to improve the selection of the random solution, and DFPA applied the navigational characteristics of the dragonfly algorithm (DA) to help in the neighborhood relationship. The results in this study indicate that the proposed algorithms have better exploration ability and fast convergence rate in comparison to previous approaches; JFPA outperforms AFPA in 3 out of 4 datasets for both small and large datasets, and DFPA outperforms AFPA and GA in all datasets while it outperforms PSO in 3 out of 4 small datasets and 2 complex large datasets.
Volume: 20
Issue: 3
Page: 1556-1568
Publish at: 2020-12-01

Evaluation of DC-DC converter using renewable energy sources

10.11591/ijpeds.v11.i4.pp1918-1925
Rajapandian B , Sundarrajan G.T
This work analyses and evaluates the performance of renewable energy sources-based converters using Intelligent techniques. The objective of the research is to maintain the reliability of the converters such that it decreases the switching losses, high duty cycle and recycles the leakage energy. To accomplish the high output voltage gain converters are designed with different intelligent methods. Due to heavy demands, the cost of fossil fuel has gone up.so the need for the time is identifying and developing renewable energy sources along with developing new technologies for energy saving in renewable energy system to fight the issues plaguing the environment.
Volume: 11
Issue: 4
Page: 1918-1925
Publish at: 2020-12-01

Development of software defect prediction system using artificial neural network

10.11591/ijaas.v9.i4.pp284-293
Olatunji B. L. , Olabiyisi S. O. , Oyeleye C. A. , Sanusi B. A. , Olowoye A. O. , Ofem O. A.
Software testing is an activity to enable a system is bug free during execution process. The software bug prediction is one of the most encouraging exercises of the testing phase of the software improvement life cycle. In any case, in this paper, a framework was created to anticipate the modules that deformity inclined in order to be utilized to all the more likely organize software quality affirmation exertion. Genetic Algorithm was used to extract relevant features from the acquired datasets to eliminate the possibility of overfitting and the relevant features were classified to defective or otherwise modules using the Artificial Neural Network. The system was executed in MATLAB (R2018a) Runtime environment utilizing a statistical toolkit and the performance of the system was assessed dependent on the accuracy, precision, recall, and the f-score to check the effectiveness of the system. In the finish of the led explores, the outcome indicated that ECLIPSE JDT CORE, ECLIPSE PDE UI, EQUINOX FRAMEWORK and LUCENE has the accuracy, precision, recall and the f-score of 86.93, 53.49, 79.31 and 63.89% respectively, 83.28, 31.91, 45.45 and 37.50% respectively, 83.43, 57.69, 45.45 and 50.84% respectively and 91.30, 33.33, 50.00 and 40.00% respectively. This paper presents an improved software predictive system for the software defect detections.
Volume: 9
Issue: 4
Page: 284-293
Publish at: 2020-12-01

Striving for the brighter future: An experience of high school students as earthquake victims

10.11591/ijere.v9i4.20709
Rose Mini Agoes Salim , Kusumasari Kartika Hima Darmayanti
High school students’ experienced negative emotions caused by the earthquake that strucked Sigi District, Central Sulawesi, Indonesia. In addition to overcoming negative emotions, they were faced with deciding on a career decision. For this reason, this research aimed to determine the effect of Future Time Perspective (FTP) on Career Decision Self-Efficacy (CDSE) of 141 students from six high schools. Simple regression indicated that FTP positively affected the CDSE of high school students. Moreover, using multivariate regression analysis on FTP and five dimensions of CDSE, we found that FTP contributes positively and significantly to the five dimensions of CDSE. Therefore, the research implied that FTP based intervention program is able to promote CDSE.
Volume: 9
Issue: 4
Page: 887-895
Publish at: 2020-12-01

Feasibility and optimal design of a hybrid power system for rural electrification for a small village

10.11591/ijece.v10i6.pp6214-6224
Bankole Adebanji , Gafari Abiola Adepoju , Paul Olulope , Taiwo Fasina , Oluwumi Adetan
A hybrid renewable energy system is at present accepted globally, as the best option for rural electrification particularly in areas where grid extension is infeasible. However, the need for hybrid design to be optimal in terms of operation and component selection serves as a challenge in obtaining reliable electricity at a minimum cost. In this work, the feasibility of installing a small hydropower into an existing water supply dam and the development of an optimal sizing optimization model for a small village-Itapaji, Nigeria were carried out. The developed hybrid power system (HPS) model consists of solar photovoltaic, small hydropower, battery and diesel generator. The optimal sizing of the system’s components for optimum configuration was carried out using Genetic Algorithm. The hybrid model’s results were compared with hybrid optimization model for electric renewable (HOMER) using correlation coefficient (r) and root mean square error (RMSE) to verify its validity. The results of the simulation obtained from the developed model showed better correlation coefficient (r) of 0.88 and root mean square error (RMSE) of 0.001 when compared to that of HOMER. This will serve as a guide for the power system engineers in the feasibility assessment and optimal design of HPS for rural electrification.
Volume: 10
Issue: 6
Page: 6214-6224
Publish at: 2020-12-01

Robust non-linear control of a hybrid water pumping system based on induction motor

10.11591/ijpeds.v11.i4.pp1995-2006
Zakaria Massaq , Abdelouahed Abounada , Mohamed Ramzi
This contribution presents a non-linear control of a hybrid pumping system supplied with a photovoltaic generator and a battery. This system is employed for delivering a continuous volume of water whatever the climatic conditions. In the DC side, a boost converter is controlled with the indirect double integral sliding mode controller (DISMC) for maximum power point tracking (MPPT). The DISMC is suitable for MPPT because it gives a fast response and reduces the amplitude of power oscillations. Then, a bidirectional buck-boost converter is adopted to ensure the energy management between the battery and the DC-bus, and this converter is controlled with integral sliding mode control (ISMC) theory.  The non-linear predictive control (NPC) is chosen to drive an induction motor (IM), the NPC is known by its fast dynamic and high capacity to reject disturbances. The hybrid system is modelled in MATLAB/Simulink software. During simulations, the DISMC-MPPT is compared with other techniques such as sliding mode controller (SMC) MPPT and integral SMC MPPT, the DISMC provides the best tracking performances under different irradiances. Moreover, the designed controller for the bidirectional converter regulates the DC-link voltage with better performances than the classical PI controller. Lastly, the NPC regulates the speed of the IM with high robustness.
Volume: 11
Issue: 4
Page: 1995-2006
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

Interactive language learning activities for learners’ communicative ability

10.11591/ijere.v9i4.20605
Siti Fatimah Omar , Haslinda Sutan Ahmad Nawi , Tengku Shahrom Tengku Shahdan , Rita Wong Mee Mee , Lim Seong Pek , Fatin Syamilah Che Yob
Learners’ communicative in English language has been unsatisfactory due to the factors that affect their self-confidence and motivation to speak. However, the problem persisted even though ways were used to overcome the lack of communicative ability among learners in Malaysia. Therefore, this study was conducted to address learners’ perceptions of interactive language learning activities in improving English-speaking ability. The study aimed to analyse the effectiveness of the interactive language learning activities in motivating learners to speak in language classroom. A set of questionnaires containing two sections with 30 questions was administered. There were 50 primary school learners selected randomly to participate in this study. The results were collected and presented in the form of tables. The finding showed that self-confidence, motivation and learning environment affect the learners’ English language speaking ability and the results indicated that interactive language learning activities are able to overcome problems pertaining to communicative in language classroom. In conclusion, interactive language learning activities improved the learners’ English language speaking ability.
Volume: 9
Issue: 4
Page: 1010-1016
Publish at: 2020-12-01

Development of an assessment tool for mathematical reading, analytical thinking and mathematical writing

10.11591/ijere.v9i4.20505
Nuttida Kesorn , Putcharee Junpeng , Metta Marwiang , Kissadapan Pongboriboon , Keow Ngang Tang , Mark Wilson
The main objective of this research was to develop and validate the quality of an assessment tool for evaluating the mathematical reading, analytical thinking, and mathematical writing skills of fourth-grade students. We randomly selected 222 fourth grade students across multiple schools of varying sizes to take the assessment. Multidimensional Random Coefficients Multinomial Item Response Model was applied to validate the quality of the developed assessment tool. A design-based research methodology was adopted to develop the assessment tool encompassing four phases as follows: 1) analyze how students solve mathematical problems; 2) develop the assessment tool; 3) validation of the tool; and 4) reflection. The results of this research indicate that the assessment tool consisting of 19 items and two dimensions is a reliable and valid metric to measure mathematical reading, mathematical writing and analytical ability of fourth graders. The Likelihood-Ratio test showed that the multidimensional model fits better in comparison to the unidimensional model. It can be concluded that each item is qualified to assess the students and relevant to the developed dimensional examination structure.
Volume: 9
Issue: 4
Page: 955-962
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

Views of primary Thai teachers toward STREAM education

10.11591/ijere.v9i4.20595
Prasart Nuangchalerm , Veena Prachagool , Treekom Prommaboon , Juhji Juhji , Imroatun Imroatun , Khaeroni Khaeroni
This study employed survey method for exploring views of teachers toward science, technology, reading, engineering, arts and math science, technology, reading, engineering, arts and math (STREAM) education. Primary teachers were asked their views through questionnaires after STREAM education workshop. Results revealed that teachers have holistic view and having positive view towards STREAM education even though all of them are not science or mathematics teachers. Change in belief and way of practices can allow teachers to do STREAM education in every classroom, design-based learning and creative classroom should be promoted as well. However, holistic view will be more effective into classroom, technology and other supporting learning environments should be prepared.
Volume: 9
Issue: 4
Page: 987-992
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
Show 1036 of 1995

Discover Our Library

Embark on a journey through our expansive collection of articles and let curiosity lead your path to innovation.

Explore Now
Library 3D Ilustration