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29,939 Article Results

Soft computing and IoT based solar tracker

10.11591/ijpeds.v12.i3.pp1880-1889
Kanhaiya Kumar , Lokesh Varshney , A. Ambikapathy , Vrinda Mittal , Sachin Prakash , Prashant Chandra , Namya Khan
The significance of the solar energy is to intensify the effectiveness of the Solar Panel with the use of a primordial solar tracking system. Here we propounded a solar positioning system with the use of the global positioning system (GPS) , artificial neural network (ANN) and image processing (IP) . The azimuth angle of the sun is evaluated using GPS which provide latitude, date, longitude and time. The image processing used to find sun image through which centroid of sun is calculated and finally by comparing the centroid of sun with GPS quadrate to achieve optimum tracking point. Weather conditions and situation observed through AI decision making with the help of IP algorithms. The presented advance adaptation is analyzed and established via experimental effects which might be made available on the memory of the cloud carrier for systematization. The proposed system improve power gain by 59.21% and 10.32% compare to stable system (SS) and two-axis solar following system (TASF) respectively. The reduced tracking error of IoT based Two-axis solar following system (IoT-TASF) reduces their azimuth angle error by 0.20 degree.
Volume: 12
Issue: 3
Page: 1880-1889
Publish at: 2021-09-01

Reduction of total harmonic distortion of three-phase inverter using alternate switching strategy

10.11591/ijpeds.v12.i3.pp1598-1608
Nur Arifah Ramli , Auzani Jidin , Zulhani Rasin , Tole Sutikno
Alternating current (AC) electrical drives mainly require smaller current (or torque) ripples and lower total harmonic distortion (THD) of voltage for excellent drive performances. Normally, in practice, to achieve these requirements, the inverter needs to be operated at high switching frequency. By operating at high switching frequency, the size of filter can be reduced. However, the inverter which oftenly employs insulated gate bipolar transistor (IGBT) for high power applications cannot be operated at high switching frequency. This is because, the IGBT switching frequency cannot be operated above 50 kHz due to its thermal restrictions. This paper proposes an alternate switching strategy to enable the use of IGBT for operating the inverter at high switching frequency to improve THD performances. In this strategy, each IGBT in a group of switches in the modified inverter circuit will operate the switching frequency at one-fourth of the inverter switching frequency. The alternate switching is implemented using simple analog and digital integrated circuits.
Volume: 12
Issue: 3
Page: 1598-1608
Publish at: 2021-09-01

Textbooks based on local wisdom to improve reading and writing skills of elementary school students

https://ijere.iaescore.com/index.php/IJERE/article/view/21683
Alfi Laila , C. Asri Budiningsih , Kastam Syamsi
Many elementary students still find it difficult to understand the literature content used and it automatically affects their reading and writing skills. However, the adjustment of literature with local wisdom-based content needs to be considered as a supporting tool. This study aimed to improve reading and writing skills using textbook based on local wisdom. The sample was grade 4 of elementary school students who selected using purposive random sampling. This research used a nonequivalent control group design through the experiment and control classes. Data were collected through writing and reading skills test of 32 students in each class and analyzed using N-gain to describe the treatment effect. The results showed that textbooks based on local wisdom were more effective than teaching materials that were not integrated by local wisdom at improving students' reading and writing skills. In the future, this study is a reference for teachers to apply local wisdom to other learning themes.
Volume: 10
Issue: 3
Page: 886-892
Publish at: 2021-09-01

The new approach minimizes harmonics in a single-phase three-level NPC 400 Hz converter for airplanes

10.11591/ijpeds.v12.i3.pp1738-1750
Do Ngoc Quy , Do Ba Phu , Nguyen Kien Trung
This paper provides a new approach to reducing high-order harmonics in 400 Hz inverter using a three-level neutral-point clamped (NPC) converter. A voltage control loop using the harmonic compensation combined with NPC clamping diode control technology. The capacitor voltage imbalance also causes harmonics in the output voltage. For 400 Hz inverter, maintain a balanced voltage between the two input (direct current) (DC) capacitors is difficult because the pulse width modulation (PWM) modulation frequency ratio is low compared to the frequency of the output voltage. A method of determining the current flowing into the capacitor to control the voltage on the two balanced capacitors to ensure fast response reversal is also given in this paper. The combination of a high-harmonic resonator controller and a neutral-point voltage controller working together on the 400 Hz NPC inverter structure is given in this paper.
Volume: 12
Issue: 3
Page: 1738-1750
Publish at: 2021-09-01

Short and open circuit faults study in the PV system inverter

10.11591/ijpeds.v12.i3.pp1764-1771
Mohammed Bouzidi , Abdelkader Harrouz , Tadj Mohammed , Smail Mansouri
The inverter is the principal part of the photovoltaic (PV) systems that assures the direct current/alternating current (DC/AC) conversion (PV array is connected directly to an inverter that converts the DC energy produced by the PV array into AC energy that is directly connected to the electric utility). In this paper, we present a simple method for detecting faults that occurred during the operation of the inverter. These types of faults or faults affect the efficiency and cost-effectiveness of the photovoltaic system, especially the inverter, which is the main component responsible for the conversion. Hence, we have shown first the faults obtained in the case of the short circuit. Second, the open circuit failure is studied. The results demonstrate the efficacy of the proposed method. Good monitoring and detection of faults in the inverter can increase the system's reliability and decrease the undesirable faults that appeared in the PV system. The system behavior is tested under variable parameters and conditions using MATLAB/Simulink.
Volume: 12
Issue: 3
Page: 1764-1771
Publish at: 2021-09-01

A two-phase plagiarism detection system based on multi-layer long short-term memory networks

10.11591/ijai.v10.i3.pp636-648
Nguyen Van Son , Le Thanh Huong , Nguyen Chi Thanh
Finding plagiarism strings between two given documents are the main task of the plagiarism detection problem. Traditional approaches based on string matching are not very useful in cases of similar semantic plagiarism. Deep learning approaches solve this problem by measuring the semantic similarity between pairs of sentences. However, these approaches still face the following challenging points. First, it is impossible to solve cases where only part of a sentence belongs to a plagiarism passage. Second, measuring the sentential similarity without considering the context of surrounding sentences leads to decreasing in accuracy. To solve the above problems, this paper proposes a two-phase plagiarism detection system based on multi-layer long short-term memory network model and feature extraction technique: (i) a passage-phase to recognize plagiarism passages, and (ii) a word-phase to determine the exact plagiarism strings. Our experiment results on PAN 2014 corpus reached 94.26% F-measure, higher than existing research in this field.
Volume: 10
Issue: 3
Page: 636-648
Publish at: 2021-09-01

Comparison of PV panels MPPT techniques applied to solar water pumping system

10.11591/ijpeds.v12.i3.pp1813-1822
Islam K. Abdul-Razzaq , Mohamed M. Fahim Sakr , Yasir G. Rashid
This paper deals with an advanced design for a pump powered by solar energyto supply agricultural lands with water and also the maximum power point is used to extract the maximum value of the energy available inside the solar panels and comparing between techniques MPPT such as Incremental conductance, perturb & observe, fractional short current circuit, and fractional open voltage circuit to find the best technique among these. The solar system is designed with main parts: photovoltaic (PV) panel, direct current/direct current (DC/DC) converter, inverter, filter, and in addition, the battery is used to save energy in the event that there is an increased demand for energy and not to provide solar radiation, as well as saving energy in the case of generation more than demand. This work was done using the matrix laboratory (MATLAB) simulink program.
Volume: 12
Issue: 3
Page: 1813-1822
Publish at: 2021-09-01

An analysis of manual and autoanalysis for submicrosecond parameters in the typical first lightning return stroke

10.11591/ijeecs.v23.i3.pp1451-1457
Muhammad Akmal Bahari , Zikri Abadi Baharudin , Tole Sutikno , Ahmad Idil Abdul Rahman , Mohd Ariff Mat Hanafiah , Mazree Ibrahim
The mechanism on how lightning detection system (LDS) operated never been exposed by manufacturer since it was confidential. This scenario motivated the authors to explore the issue above by using MATLAB to develop autoanalysis software based on the feature extraction. This extraction is intended for recognizing the parameters in the first return stroke, and compare the measurement between the autoanalysis software and the manual analysis. This paper is a modification based on a previous work regarding autoanalysis of zero-crossing time and initial peak of return stroke using features extraction programming technique. Further, the parameter on rising time of initial peak is added in this autoanalysis programming technique. Finally, the manual analysis using WaveStudio (LeCroy product) of those two lightning parameters is compared with autoanalysis software. This study found that the autoanalysis produce similar result with the manual analysis, hence proved the reliability of this software.
Volume: 23
Issue: 3
Page: 1451-1457
Publish at: 2021-09-01

Vision based solar tracking system for efficient energy harvesting

10.11591/ijpeds.v12.i3.pp1431-1438
Kanhaiya Kumar , Lokesh Varshney , A. Ambikapathy , Inayat Ali , Ashish Rajput , Anant bhatnagar , Sajal omar
Electricity is a major source of energy for fast growing population and the use of nonrenewable source is harmful for our environment. This reason belongs to devastating of environment, so it is required to take immediate action to solve these problems which result the solar energy development. Production of a solar energy can be maximizing if we use solar follower. The major part of solar panels is microcontroller with arrangement of LDR sensor is used to follow the sun, where the sensors is less efficient to track the sun because of the low sensitivity of LDR. We are proposing a method to track sun more effetely with the help of both LDR sensors and image processing. This type of mechanism can track sun with the help of image processing software which combines both result of sensors and processed sun image to control the solar panel. The combination of both software and hardware can control thousands of solar panels in solar power plants.
Volume: 12
Issue: 3
Page: 1431-1438
Publish at: 2021-09-01

Fish survival prediction in an aquatic environment using random forest model

10.11591/ijai.v10.i3.pp614-622
Md. Monirul Islam , Mohammod Abul Kashem , Jia Uddin
In the real world, it is very difficult for fish farmers to select the perfect fish species for aquaculture in a specific aquatic environment. The main goal of this research is to build a machine learning that can predict the perfect fish species in an aquatic environment. In this paper, we have utilized a model using random forest (RF). To validate the model, we have used a dataset of aquatic environment for 11 different fishes. To predict the fish species, we utilized the different characteristics of aquatic environment including pH, temperature, and turbidity. As a performance metrics, we measured accuracy, true positive (TP) rate, and kappa statistics. Experimental results demonstrate that the proposed RF-based prediction model shows accuracy 88.48%, kappa statistic 87.11% and TP rate 88.5% for the tested dataset. In addition, we compare the proposed model with the state-of-art models J48, RF, k-nearest neighbor (k-NN), and classification and regression trees (CART). The proposed model outperforms than the existing models by exhibiting the higher accuracy score, TP rate and kappa statistics.
Volume: 10
Issue: 3
Page: 614-622
Publish at: 2021-09-01

CLG clustering for dropout prediction using log-data clustering method

10.11591/ijai.v10.i3.pp764-770
Agung Triayudi , Wahyu Oktri Widyarto , Lia Kamelia , Iksal Iksal , Sumiati Sumiati
Implementation of data mining, machine learning, and statistical data from educational department commonly known as educational data mining. Most of school systems require a teacher to teach a number of students at one time. Exam are regularly being use as a method to measure student’s achievement, which is difficult to understand because examination cannot be done easily. The other hand, programming classes makes source code editing and UNIX commands able to easily detect and store automatically as log-data. Hence, rather that estimating the performance of those student based on this log-data, this study being more focused on detecting them who experienced a difficulty or unable to take programming classes. We propose CLG clustering methods that can predict a risk of being dropped out from school using cluster data for outlier detection.
Volume: 10
Issue: 3
Page: 764-770
Publish at: 2021-09-01

Comparison of electronic load using linear regulator and boost converter

10.11591/ijpeds.v12.i3.pp1720-1728
Razman Ayop , Shahrin Md Ayob , Chee Wei Tan , Tole Sutikno , Mohd Junaidi Abdul Aziz
Direct current (DC) electronic load is a useful equipment for testing the electrical system. It can emulate various load at a high rating. The electronic load requires a power converter to operate and a linear regulator is a common option. Nonetheless, it is hard to control due to the temperature variation. This paper proposed a DC electronic load using the boost converter. The proposed electronic load operates in the continuous current mode and control using the integral controller. The electronic load using the boost converter is compared with the electronic load using the linear regulator. The results show that the boost converter able to operate as an electronic load with an error lower than 0.5% and response time lower than 13 ms.
Volume: 12
Issue: 3
Page: 1720-1728
Publish at: 2021-09-01

Wind speed modeling based on measurement data to predict future wind speed with modified Rayleigh model

10.11591/ijpeds.v12.i3.pp1823-1831
Suwarno Suwarno , Rohana Rohana
The development of modeling wind speed plays a very important in helping to obtain the actual wind speed data for the benefit of the power plant planning in the future. The wind speed in this paper is obtained from a PCE-FWS 20 type measuring instrument with a duration of 30 minutes which is accumulated into monthly data for one year (2019). Despite the many wind speed modeling that has been done by researchers. Modeling wind speeds proposed in this study were obtained from the modified Rayleigh distribution. In this study, the Rayleigh scale factor (Cr) and modified Rayleigh scale factor (Cm) were calculated. The observed wind speed is compared with the predicted wind characteristics. The data fit test used correlation coefficient (R2), root means square error (RMSE), and mean absolute percentage error (MAPE). The results of the proposed modified Rayleigh model provide very good results for users.
Volume: 12
Issue: 3
Page: 1823-1831
Publish at: 2021-09-01

Identification of optimum segment in single channel EEG biometric system

10.11591/ijeecs.v23.i3.pp1847-1854
Muhammad Afif Hendrawan , Pramana Yoga Saputra , Cahya Rahmad
Nowadays, biometric modalities have gained popularity in security systems. Nevertheless, the conventional commercial-grade biometric system addresses some issues. The biggest problem is that they can be imposed by artificial biometrics. The electroencephalogram (EEG) is a possible solution. It is nearly impossible to replicate because it is dependent on human mental activity. Several studies have already demonstrated a high level of accuracy. However, it requires a large number of sensors and time to collect the signal. This study proposed a biometric system using single-channel EEG recorded during resting eyes open (EO) conditions. A total of 45 EEG signals from 9 subjects were collected. The EEG signal was segmented into 5 second lengths. The alpha band was used in this study. Discrete wavelet transform (DWT) with Daubechies type 4 (db4) was employed to extract the alpha band. Power spectral density (PSD) was extracted from each segment as the main feature. Linear discriminant analysis (LDA) and support vector machine (SVM) were used to classify the EEG signal. The proposed method achieved 86% accuracy using LDA only from the third segment. Therefore, this study showed that it is possible to utilize single-channel EEG during a resting EO state in a biometric system.
Volume: 23
Issue: 3
Page: 1847-1854
Publish at: 2021-09-01

Distribution of attempted leader with monsoon seasons and negative cloud-to-ground flashes in Melaka, Malaysia

10.11591/ijeecs.v23.i3.pp1324-1330
Nur Asyiqin Isa , Zikri Abadi Baharudin , Hidayat Zainuddin , Tole Sutikno , Maslan Zainon , Ahmad Aizan Zulkefle
Ninety (90) waveforms recognized as attempted leader were identified with both positive (84 events) and negative (6 events) initial polarity observed from four consecutive years of data (N=10,206). The positive attempted leader shows no correlation with the number of thunderstorms producing it during monsoon. Meanwhile, the negative attempted leader during monsoon and both polarity of attempted leader (positive and negative) during inter-monsoon shows positive correlation with the number of thunderstorms producing it. In this study, the yearly statistical distribution of negative cloud-to-ground (CG) lightning flashes which were classified as positive preliminary breakdown pulses (214 events) and negative preliminary breakdown pulses (4982 events) in accordance of their preliminary polarity were also presented. In addition, there is no relationship of attempted leader and the initial breakdown of negative ground flash since both mechanisms performed as a negative correlation.
Volume: 23
Issue: 3
Page: 1324-1330
Publish at: 2021-09-01
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