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29,922 Article Results

Relationship between social media addiction, game addiction and family functions

10.11591/ijere.v9i4.20680
Ebru Yayman , Okan Bilgin
This study examined the relationship between social media addiction, game addiction and family functions in adolescents. Respondent of this study is 762 students studying at four different high schools of the province of İstanbul. In the study, Pearson Moment Correlation Coefficient was found to determine the level of relationships between social media addiction, game addiction and family functions in adolescents. The effects of social media addiction and game addiction in adolescents on family functions were examined with regression analysis technique. When the relationships between social media addiction, game addiction and family functions in adolescents were examined, a positive relationship was found between social media and game addiction, while a positive significant relationship was found between both social media and game addiction and unhealthy family functions. In addition, it was also concluded that social media addiction and game addiction in adolescents were significant predictors of all subdimensions of family functions.
Volume: 9
Issue: 4
Page: 979-986
Publish at: 2020-12-01

1 Slash 100%: gamification of mathematics with hybrid QR-based card game

10.11591/ijeecs.v20.i3.pp1453-1459
Ong C. Yung , Syahrul N. Junaini , Ahmad A. Kamal , Laili F. Md Ibrahim
Mathematics is vital in our life and society. However, gamification of mathematics is rare for topics such as fractions and decimals. This paper presents the development of an educational mathematics game called one slash one hundred percent (1 Slash 100%). It is the hybridization of the conventional card game and quick response (QR). This research aims to study how the respondents explore the card game to master decimal, fraction and percentage. The testing was conducted among secondary school students in Kuching, Sarawak, Malaysia (n=12; age=14). The respondents were asked to answer a set of questions in pre-test and post-test question. The results are promising where the analysis showed a significant difference between pre-test (M=14.3, SD=2.103) and post-test scores (M=17.6, SD=2.234). Thus, gamification of mathematics using the hybrid card game increases their mastery of decimal, fraction and percentage.
Volume: 20
Issue: 3
Page: 1453-1459
Publish at: 2020-12-01

Experimental implementation PWM strategy for dual three-phase PMSM using 12-sector vector space decomposition applied on electric ship propulsion

10.11591/ijpeds.v11.i4.pp1701-1710
Mhammed Hasoun , Aziz El Afia , Mohamed Khafallah , Karim Benkirane
The current paper aims at presenting and examining an implementation on a digital signal processor (DSP) of the conventional space vector pulse width modulation (CSVPWM) so as to control the dual three phase permanent magnet synchronous motors (DTP-PMSM) drives applied on electric ship propulsion. It is also an attempt to accomplish a developed control of this technique based on vector space decomposition (VSD) strategy. By this strategy, the analysis and the control of the machine are achieved in three two-dimensional orthogonal subspaces. Among the 12 voltage vectors having maximum, the conventional technique namely the adjacent two-vectors (12SA2V) is chosen. Thereby, the test platform allows the implementation of the chosen vectors which are modeled on MATLAB/Simulink using block diagrams and the automatically generated code which is targeted in the DSP card processor. Simulation and experimental results have exposed the efficiency of the proposed test bench of 5 KW prototype machine by using a low-cost TMS32F28379D.
Volume: 11
Issue: 4
Page: 1701-1710
Publish at: 2020-12-01

Radiation performance enhancement of an ultra wide band antenna using metamaterial band-pass filter

10.11591/ijece.v10i6.pp5861-5870
Marwa Daghari , Hedi Sakli
In this paper, a metamaterial structure based on Frequency Selective Surface (FSS) cell is proposed to achieve an isotropic band-pass filtering response. This filter consists of a planar layer formed by a 3×3 metamaterials cell array with transmittive filtering behavior at 3.5 GHz. This design with 45 mm × 45 mm dimension is then integrated in close proximity at distance of 10 mm with an Ultra Wide Band (UWB) antenna to enhance it’ s performances around a 3.5 GHz operating frequency. Simulation results ensure that filter geometry provides the advantage of polarization independency and also exhibits the angular stability up to 45◦ for both Transverse Electric (TE) and Transverse magnetic (TM) modes. More importantly, enhancement in antenna radiation pattern characteristics is illustrated when the planar FSS layer is integrated at a small distance from the radiator. Moreover, antenna gain was improved to 3.22 dBi, adaptation of antenna port (S11) was increased to -53.26 dB and antenna bandwidth reduction to 1.7 GHz is also detected. All these performances make the proposed design as a good choice used to shield signals in UWB wireless applications especially for connected object in 5G.
Volume: 10
Issue: 6
Page: 5861-5870
Publish at: 2020-12-01

Experimental determination of suboptimal parameters for energy-efficient control of an induction motor

10.11591/ijpeds.v11.i4.pp2173-2182
Valentina S. Goun , Aleksandr S. Anikin , Aleksey A. Bakin
The article presents the results of experimental studies of the automatic speed control system (ASCS) of an induction motor (IM). Preliminary experimental studies have shown that the stator current minimum (power factor) is a suboptimal criterion. Optimal in terms of control is the rated power factor. Tests of IM with a thyristor voltage converter (TVC), as a power source, were conducted on an installation created at the department. A mathematical model of ASCS IM corresponding to the experimental setup has been developed. To determine the main functional dependences of IM, such as stator voltage, stator current, power factor, torque on the shaft, a program for approximating experimental data by polynomials was developed. Using the developed mathematical model, the regulatory characteristic of IM that was optimal from an energy point of view was obtained. The necessary indicators of IM and TVC are determined (thyristor control angle, stator voltage, stator current) to change existing settings in order to save electric energy. The results of experimental studies are presented, the graph shows an optimized version of the form of the regulatory characteristic according to the criterion of minimum electric energy consumption.
Volume: 11
Issue: 4
Page: 2173-2182
Publish at: 2020-12-01

A simple levelized cost of electricity for EV charging with PV and battery energy storage system: Thailand case study

10.11591/ijpeds.v11.i4.pp2223-2230
Aree Wangsupphaphol , Surachai Chaitusaney
This paper proposes the calculation of the simple levelized cost of electricity of PV and battery energy storage system for supporting the investment decision of the EV hybrid charging station. The paper introduces the problems of EV charging against the grid power system. Thus, the hybrid charging for EV is suggested. The study provides an architecture of the hybrid EV charging station along with the factor impacting the EV infrastructure for acknowledgment. The cost elements of the station are presented to address the benefits of the investment. Besides, the profit is mainly from the margin of the electricity price, therefore, this study compares the electricity cost of PV and PV equipped with a battery with the commercial on-peak electricity tariff.  The results show that the charging cost contributed by PV alone has the lowest amount throughout the study period year 2020 – 2030. In contrast, the hybrid charging cost contributed by PV and battery has a higher value than the on-peak tariff during 2020 – 2025 but it is lower afterward. The result supports the feasibility of charging an EV by solar power and the hybrid power system in the future.
Volume: 11
Issue: 4
Page: 2223-2230
Publish at: 2020-12-01

Novel approach for SVPWM of two-level inverter fed induction motor drive

10.11591/ijpeds.v11.i4.pp1750-1758
Olwi A. Elkholi , Mohamed A. Enany , Ahmed F. Abdo , Mahmoud Eid
Due to their better DC bus utilization and easier digital realization, Space Vector Pulse Width Modulation (SVPWM) scheme is the most widely used PWM scheme. Also two level inverter is the traditional frequency converter because it has fewer components and is lower complex to control, but on the other hand it generates higher harmonic distortion. This paper presents the realization of novel SVPWM approaches applied to the three phase induction motor drives. Specifically various schemes are based on using more combinations of step operation in each cycle to approximate the reference vector, such as 24 and 48 step operations in each cycle. The basic principle of conventional SVPWM with different modulation index M is presented. The switching sequences of new approaches are described. The modulation signals waveforms, DC bus voltage utilization, De-rated motor torque, standard error of average torque, voltage and current harmonic of new approaches are analyzed by the MATLAB/SIMULINK software. The results confirms that 48 step SVPWM approach is the best compared to other approaches.
Volume: 11
Issue: 4
Page: 1750-1758
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

Experimental installation of wireless power transfer system based on the series resonance technology

10.11591/ijpeds.v11.i4.pp1693-1700
Sarab Al-Chlaihawi , Adnan Hasan Tawafan , Fatima Kadhem Abd
In this work, we aim to install a wireless power transfer (WPT) system experimentally. Series resonance technology was used to achieve zero-voltage switching (ZVS). We investigated the impact of the primary and secondary resonance frequencies (fp and fd), and inverter frequency switching (fch) on the efficiency (β) and maximum transfer power in a WPT system based on the inductive wireless power transfer (IWPT) technology. An ultrasonic device was utilized as a generator to excite the coil at the primary side. The experimental outcomes showed that there is an optimum unlike fp and fd can be got to match fch. It was found also that there is a trade-off between the power supplied to the load (PRL) and DC-DC efficiency (β). At an air-gap of 5 cm, the obtained results are recorded as follows; the peak recorded system β is 62% that was obtained at fp=19 kHz, fd=fch=24 kHz that is corresponding to 101.88W of PRL; whereas the highest PRL resulted i.e. 244W when fp=19 kHz, fd =24 kHz, fch=21 kHz at 61% of β; in such case, the maximum β* PRL multiplication was achieved i.e. 149. Moreover, the coils’ misalignment was studied. The outcomes showed that the lateral misalignment has worst effect on the PRL and β than the air-gap. The experimental results were validated with simulation ones.
Volume: 11
Issue: 4
Page: 1693-1700
Publish at: 2020-12-01

Innovations into industrial technology programmes of Nigerian Universities for effective application of mobile communication technologies and quality assurance of graduates

10.11591/ijeecs.v20.i3.pp1315-1324
Jimoh Bakare , Hyginus Osita Omeje , Samson Oluwatimilehin , Samson Ikenna Nwaodo , Obe Pauline Ijeoma , Olusesan Johnson Ogunmilade , Ojo Ajiboye Olaoye
The study innovated the industrial technology programmes of Nigerian Universities for effective application of mobile communication technologies and quality assurance of graduates. Five research questions guided the study while three null hypotheses formulated were tested at .05 level of significance. The study made use of descriptive survey design and was carried out in Enugu State, Nigeria.nThe participants for the study were 120 comprising of 67 lecturers ofmelectrical/electronic technology and 53 technologists of industrial technical education. A 97-item questionnaire was used as instrument for data collection. One hundred and eighteen copies of the questionnaire were retrieved. The data collected were analyzed using mean, factor analysis, standard deviation and improvement need index (INI) to answer the four research questions while analysis of variance was employed to test the hypotheses at .05 level of significance. Results revealed that 33 innovations for inclusion into programme of electrical/electronic technology. Furthermore, the results of the study revealed that teachers need improvement in implementing the innovated contents of electrical/electronic technology aspect of industrial technical education programme. Hence, there is need to package the findings of the study into training programme and use it for building the capacity of teachers of electrical/electronic technology in Nigerian universities.
Volume: 20
Issue: 3
Page: 1315-1324
Publish at: 2020-12-01

Sliding mode performance control applied to a DFIG system for a wind energy production

10.11591/ijece.v10i6.pp6139-6152
Mansouri FatimaZohra , Bendjebbar Mokhtar , Mazari Benyounes
This project presents a strategy of field control then sliding mode control put in to the conversion process of wind energy containing an asynchronous generator with double fed (DFAG; DFIG). A model was developed for each component of the wind turbine (turbine, DFAG and cascade rectifier-inverter). MPPT device must be introduced in order to obtain maximum energy efficiency so that PI-MPPT method is made. The objective is to apply this command to control independently the active and reactive powers generated by the asynchronous generator uncoupled by orientation from the flow. The results of digital simulations obtained show the improvement of the performances of the sliding control compared to the field control, also it has provided information on the commands available techniques as reference tracking and robustness.
Volume: 10
Issue: 6
Page: 6139-6152
Publish at: 2020-12-01

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

Influence of social media on students’ academic achievement

10.11591/ijere.v9i4.20638
Basil Chinecherem Oguguo , Juliet O. Ajuonuma , Roseline Azubuike , Catherine U. Ene , Florence O. Atta , Chidimma J. Oko
This study determined the influence of using social media on the academic achievement of senior secondary school students. A sample of 150 students comprising 70 males and 80 females were drawn from five schools and used for the study, this was arrived at through multi-stage sampling procedure. Social Media Questionnaire (SMQ) and Students’ Accounting Achievement Proforma (SAAP) were used for data collection. The result showed that students frequently engage in social media in order to make new friends, research about their assignments and source for other educational materials, stay up to dates with latest trends and news. The finding also showed that students spend an average, 2 to 4 hours daily on social media. There was no significant influence of frequency of social media use by students on their mean academic achievements in Accounting; however, gender of students was found to have a significant influence on students’ mean academic achievement in Accounting. Students should be guided properly and informed on the vulnerabilities likely to come their way if they fail to appropriately utilize the opportunities that come with having social media platforms.
Volume: 9
Issue: 4
Page: 1000-1009
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

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
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