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29,922 Article Results

A high-performance multilevel inverter with reduced power electronic devices

10.11591/ijpeds.v11.i4.pp1883-1889
Amer Chlaihawi , Adnan Sabbar , Hur Jedi
This paper introduces a new topology of multilevel inverter, which is able to operate at high performance. This proposed circuit achieves requirements of reduced number of switches, gate-drive circuits, and high design flexibility. In most cases fifteen-level inverters need at least twelve switches. The proposed topology has only ten switches. The inverter has a quasi-sine output voltage, which is formed by level generator and polarity changer to produce the desired voltage and current waveforms. The detailed operation of the proposed inverter is explained. The theoretical analysis and design procedure are given. Simulation results are presented to confirm the analytical approach of the proposed circuit. A 15-level and 31-level multilevel inverters were designed and tested at 50 Hz.
Volume: 11
Issue: 4
Page: 1883-1889
Publish at: 2020-12-01

Business students’ perspectives: What makes successful group performance?

10.11591/ijere.v9i4.20534
Rinny Cherill Rantung , Reggy Nelson Sarmita
Purpose of this study was to identify factors contributing to the successful group performance from the perspective of business students. The in-depth interview was done followed by a survey derived forty-five items variables, after some tests 21 items variables removed due to low item remainder coefficient resulted in 24 items questionnaires. A total of 355 respondents participated during the survey. Exploratory factor analysis with principal factor extraction was performed and five contributing factors were extracted. Those factors are cohesiveness, inter-relationship, norms, diversity and appointed of team leader.
Volume: 9
Issue: 4
Page: 896-902
Publish at: 2020-12-01

Analysis on EMF characteristics for torque ripple reduction in BLAC motor intended for HVLS fan application

10.11591/ijpeds.v11.i4.pp2203-2211
Nurfaezah Abdullah , Raja Nor Firdaus Raja Othman , Kasrul Abdul Karim , Lim Seng Tat
This paper analyzes the harmonic characteristics of electromagnetic force (EMF) in Brushless Alternating Current (BLAC) motor for High Volume Low Speed (HVLS) fan application. Vibration and noise are one of the main crucial things in HVLS fan application. It comes from torque ripples which can be detected by harmonics of Electro Magnetic Force (EMF). Commonly, there are a few methods to eliminate the noise and vibrations issue, but most literatures only focus on small motor and not intended for HVLS fan application. Thus, the objective of this paper is to eliminate the harmonics content in EMF at early stage design. Through EMF harmonics the expected torque produced could be used to select proper slot-pole number in order to eliminate the noise and vibrations issue. In here, the analysis involves three different slot-pole numbers which are 18s/20p, 12s/10p and 9s/8p BLAC model, respectively. All models have similar volume of permanent magnet. The analysis is carried out using FLUX 2D Finite Element Analysis (FEA) for EMF computational and transient torque computation. Later, Fast Fourier Transform (FFT) analysis is used to calculate the harmonics of EMF. The analysis stage includes the EMF parameter analysis, harmonics and torque ripples analysis. It was found that 18s/20p has higher output torque with the lowest 5% torque ripple value. As a conclusion, this paper presents low torque ripple in point of view of the EMF characteristics in designing HVLS fan.
Volume: 11
Issue: 4
Page: 2203-2211
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

A new hybrid algorithm for solving distribution network reconfiguration under different load conditions

10.11591/ijeecs.v20.i3.pp1118-1127
Omar Muhammed Neda
Distribution network reconfiguration (DNR) is a significant problem for keeping the network running under normal conditions. In this study, for preventing the premature convergence issue, also to improving the searching ability of the binary particle sarm optimization (BPSO) algorithm, chaotic strategy is incorporating with BPSO algorithm to create a new hybrid algorithm called chaotic BPSO (CBPSO). Undeniably, the chaotic strategy enables the hybrid CBPSO algorithm to slip from the local optima and also to reach optimal solution in fewer number of iterations compare to BPSO due to the remarkable behavior and ergodic of the chaos strategy than random search in BPSO algorithm. The CBPSO algorithm is presented as a advantageous optimization tool for solving DNR. In this problem, decreasing of real power loss () is an objective function while node voltage, system radially and line current have been utilized as a constrains of the system. The search space in this problem for the presented technique is a group of lines (switches) that are normally opened or closed. Two types of loads are presented: the constant and variable loads for testing the efficacy of the CBPSO method for tackling DNR problem when the load is changes. The proposed technique is implemented on IEEE Node system by utilizing R2013b software for verifying the efficacy of CBPSO technique. The simulation results confirm that technique has high ability in reducing and raising the voltage profile of the grid compared to and other procedures in the literature.
Volume: 20
Issue: 3
Page: 1118-1127
Publish at: 2020-12-01

Attitudes and opinions of counselors about education of gifted students

10.11591/ijere.v9i4.20564
Nisa Gökden Kaya , Hasan Said Tortop
Counselors play effective roles not only in diagnosing but also in education of gifted students who lead the development of the societies. This study aimed to examine the attitudes and opinions of the counselors about the education of the gifted students. In the study, descriptive survey model is used. Both qualitative and quantitative data was collected within mixed method, according to the principles of pragmatist philosophy. “Attitude Scale towards Gifted Education” was applied to 250 counselors in order to collect quantitative data. The scale, which consists of 14 items, was developed by Gagné and Nadeau and adapted to Turkish by Tortop. The qualitative data was collected by semi-structured interview form consists of four questions about opinions on education of gifted students in Turkey, and was applied to 40 counselors. The mean of scores gathered from “Attitude Scale towards Gifted Education” was found 3.6 which is evaluated as slightly positive attitude. The scores were analyzed according to gender, seniority, having gifted students and institution of counselors, by using t test and ANOVA. Content analysis was performed for qualitative data that was gathered from interviews. The majority of counselors have stated that there are problems in education and diagnosis of gifted students.
Volume: 9
Issue: 4
Page: 1017-1024
Publish at: 2020-12-01

Modeling of battery pack sizing for electric vehicles

10.11591/ijpeds.v11.i4.pp1987-1994
V. Sandeep , Suchitra Shastri , Arghya Sardar , Surender Reddy Salkuti
The paper presents the mathematical modeling for battery pack sizing to evaluate the vehicle energy consumption by using the derivation from Parametric Analytical Model of Vehicle Energy Consumption (PAMVEC) by Simpson in R Studio. The assess of storage batteries for electric vehicles (EVs) application is presented in this paper. The main source of power in EVs are batteries and to properly optimize their use in them, a parametric vehicle dynamic model is created and factors like battery mass, energy needed for the EV etc. are predicted using inputs such as battery specific energy, range etc. An assessment of output parameters is performed by using different batteries and compared to determine best battery for EV application.
Volume: 11
Issue: 4
Page: 1987-1994
Publish at: 2020-12-01

An enhanced 17-level hybridized multilevel inverter with stair case modulation

10.11591/ijpeds.v11.i4.pp1872-1882
Hemalatha Javvaji , Basavaraja Banakara
This paper proposes a Hybridized Symmetric Cascaded Multilevel Inverter for voltage levels ranging from 5 levels to 17 levels. The proposed Multi Level Inverter (MLI) topology is built using a modified H-bridge inverter that results in an increased output voltage levels with a smaller number of solid-state switches. This technique enhances the h-bridge configuration from three level to five level by means of a bi-directional switch at source. Gating pulses of hybridized symmetric MLI are generated through staircase modulation. The operation and performance of the proposed topology is tested for different output voltage levels, simulation results prove that the proposed technique results in less THD at all levels with lesser power consumption and are easily applicable for renewable energy applications.
Volume: 11
Issue: 4
Page: 1872-1882
Publish at: 2020-12-01

Teachers’ strategies on teaching grammar: Facts and expectations of senior high school teachers at Ambon

10.11591/ijere.v9i4.20643
Threesje Roza Souisa , Lelyemin Yanuarius
This study is aimed at describing the English as a Foreign Language (EFL) senior high schools’ teachers’ perceptions on grammar teaching; their teaching strategies which are the most and less frequently applied in their classroom practices and the challenges that they have in teaching grammar. Explanatory mixed approaches were conducted involving 63 teachers as the sample population in collecting quantitative data, and five selected teachers as participants for collecting the qualitative data. The findings showed that teachers' perceptions of grammar teaching are based on their conceptual knowledge as they have experienced it and it is based on grammar theories. The teachers applied vary grammar approaches and strategies but they still face with the challenges in teaching grammar such as students' learning styles and less of teaching references.
Volume: 9
Issue: 4
Page: 1121-1127
Publish at: 2020-12-01

Wireless charging system for electric bicycle application

10.11591/ijpeds.v11.i4.pp1926-1935
Nguyen Thi Diep , Nguyen Kien Trung , Tran Trong Minh
This paper presents a design of the wireless charging system for e-byke applications. The double-side LCC compensation circuit is used to achieve high efficiency and reduce the volt-ampere rating. A new constant current/voltage (CC/CV) charging control method at the transmitter side is proposed to avoid dual side wireless communication. This paper also presents a simple method of estimating both the coupling coefficient and load impedance only from the transmitter side. A wireless charging system of 2.5kW is built. Error in the CC/CV charging mode is 3.3% and 1.12%, respectively. System efficiency reaches 92.1% in CC charging mode.
Volume: 11
Issue: 4
Page: 1926-1935
Publish at: 2020-12-01

Application of thermal imaging for detecting cold air leak location in cold storage

10.11591/ijaas.v9.i4.pp294-301
P. Pathmanaban , Shanmuga Sundaram Anandan , B. K. Gnanavel , C. P. Murigan
Nowadays Cold storage has been playing an important role in preserving the perishable food products like fruits, vegetables, dairy products, fish, and meat etc. The major problem of cold storage is unwanted energy transmission during the operation. It is necessary to maintain the constant temperature during storing the products. There are different kinds of energy loss happening during the operation. One of the major causes is cold air leaking from the inside of the cold room to outside. It is due to poor insulation and improper maintenance of cold storage. It is very difficult to identify the exact location of the leak by the naked eye. In this research work, the cold storage was inspected with the thermal imaging system. Thermal cameras are highly sensitive to temperature and it can detect the variation of temperature ranging from 0.1°C. The measured temperatures are further converted into a colour based pattern. It is known as thermogram. These colour-based thermal patterns are further processed for identifying energy transmission location. It is done by applying various image processing methods such as histogram equalization, diffusion error, otsu thresholding and morphologic function. These techniques were applied to images of cold storages and exact cold air transmission locations were identified.
Volume: 9
Issue: 4
Page: 294-301
Publish at: 2020-12-01

Real-time switching thirteen-level modified CHB-Multilevel inverter using artificial neural network technique based on selective harmonic elimination

10.11591/ijeecs.v20.i3.pp1642-1652
Moataz M.A. Alakkad , Zulhani Rasin , Mohammed Rasheed , Wahidah Abd Halim , Rosli Omar
Recently, global research is giving more attention to the renewable energy sources due to its sustainability and environmentally friendly nature. The necessity of DC to AC conversion to integrate these sources to the well established AC power system create a significant development of multi-level inverter with its advantages of operating at higher rating system with lower component rating as well as better harmonics performance at it output voltage and current. In this research paper, a modified topology of CHB-MLI to provide 13-level output AC waveform is proposed based on the SHE-PWM strategy using the ANN optimization technique. The system modeling is done with Matlab Simulink software and verification are carried out by both simulation and experiment. Results show that the ANN technique able to reduce the THD significantly as the level of waveform is increased as low as 5.16% THD for the 13-level output voltage. Results from the experiment shows a good agreement with the simulation, thus verifying the effectiveness of the proposed ANN technique as an optimization method. 
Volume: 20
Issue: 3
Page: 1642-1652
Publish at: 2020-12-01

Discrete and continuous model of three-phase linear induction motors considering attraction force and end-effects

10.11591/ijpeds.v11.i4.pp1737-1749
Nicolás Toro-García , Yeison Alberto Garcés-Gómez , Fredy E. Hoyos
The continuous model of the linear induction motor (LIM) has been made considering the edge effects and the attraction force. Taking the attraction force into account is im- portant when considering dynamic analysis when the motor operates under mechanical load. A laboratory prototype has been implemented from which the parameters of the equivalent LIM circuit have been obtained. The discrete model has been developed to quickly obtain computational solutions and to analyze non-linear behaviors through the application of discrete control systems. In order to obtain the discrete model of the LIM we have started from the solution of the continuous model. To develop the model, the magnetizing inductance has been considered, which reflects the edge effects. In the results, the model is compared without considering the edge effects or the attraction force with the proposed model.
Volume: 11
Issue: 4
Page: 1737-1749
Publish at: 2020-12-01

Biometric authenticator algorithm based on multiresolution analysis

10.11591/ijeecs.v20.i3.pp1332-1341
Kerrache Soumia , Beladgham Mohammed , Hamza Aymen , Kadri Ibrahim
In this paper, we propose a feature extraction method for two-dimensional imageauthentication algorithm using curvelet transform and principal component analysis(PCA). Since wavelet transform can not adequately describe facial curves features,Theproposed approach involves image denoising applying a 2D-Curvelet transform toachieve compact representations of curves singularities. To assess the performanceof the presented method, we have employed three classifification techniques: Neuralnetworks (NN), K-Nearest Neighbor (KNN) and Support Vector machines (SVM).Extensive experimental results and comparison with the existing methods show the effectiveness of the proposed recognition method in the ORL face database and CASIAiris database.
Volume: 20
Issue: 3
Page: 1332-1341
Publish at: 2020-12-01

Improvement of the performance of STATCOM in terms of voltage profile using ANN controller

10.11591/ijpeds.v11.i4.pp1966-1978
Mohammed Salheen Alatshan , Ibrahim Alhamrouni , Tole Sutikno , Awang Jusoh
The electronic equipments are extremely sensitive to variation in electric supply. The increasing of a nonlinear system with several interconnected unpredicted and non-linear loads are causing some problems to the power system. The major problem facing the power system is power quality, controlling of reactive power and voltage drop. A static synchronous compensator (STATCOM) is an important device commonly used for compensation purposes, it can provide reactive support to a bus to compensate voltage level. In this paper, the Artificial Neural Network (ANN) controlled STATCOM has been designed to replace the conventional PI controller to enhance the STATCOM performance. The ANN controller is proposed due to its simple structure, adaptability, robustness, considering the power grid non linearities. The ANN is trained offline using data from the PI controller. The performance of STATCOM with case of Load increasing and three-phase faults case was analyzed using MATLAB/Simulink software on the IEEE 14-bus system. The comprehensive result of the PI and ANN controllers has demonstrated the effectiveness of the proposed ANN controller in enhancing the STATCOM performance for Voltage profile at different operating conditions. Furthermore, it has produced better results than the conventional PI controller.
Volume: 11
Issue: 4
Page: 1966-1978
Publish at: 2020-12-01
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