Articles

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

Advanced Search
Filter Icon

Filters article

Years

FAQ Arrow
Single Year
Range Year
0
0

Source Title

FAQ Arrow

Authors

FAQ Arrow

29,939 Article Results

Comparative analysis of fuzzy and ANFIS based MPPT controller for wind power generation system

10.11591/ijape.v10.i4.pp355-363
Annamalai Muthu
In recent years, huge developments in wind energy production and meet consumer demand. Numerous researchers have focused on maximum energy generation techniques for the wind system. The main reason for this work is to compare the different smart controllers for the maximum power generation techniques in the wind system. In this article, we developed and modeled a 250-watt wind power system in a MATLAB environment and simulated it in different weather conditions. Based on the simulation results, two intelligent controllers, such as fuzzy and ANFIS, were proposed and compared to obtain the maximum energy generation techniques in the wind system. Finally, the optimal smart controller was chosen based on performance.
Volume: 10
Issue: 4
Page: 355-363
Publish at: 2021-12-01

Integration of Ignatian values in the development of algebraic thinking via utilization of quasi-variables: A lesson study

10.11591/ijere.v10i4.21583
Marian Grace Veloso , Lucio Landanganon , Raquel Lamanilao , Levi Elipane
This paper reflects on the outcome of lesson study in teaching the concept of algebraic equations utilizing quasi-variables. It also concurrently examines the integration of Ignatian values and social issues in learning the said concept. This study aimed to establish a culture of planning, collaboration, and reflection in developing the understanding and relevance of mathematical concepts in grade school through lesson study. The study showed how the process of lesson study was done given the following phases: planning phase, implementation phase, and post-lesson reflection and discussion phase. Emphasis on the planning phase was given on the details of the lesson design which aimed to integrate Ignatian values in the discussion while developing algebraic thinking from quasi-variable thinking delivered in the implementation phase. Findings highlighted on three statements: i) Collaborative lesson planning nurtures a deeper sense of scholarship and collegiality; ii) Building algebraic thinking from quasi-variable (arithmetic) thinking is a viable strategy for understanding the concept of algebraic equation; and iii) Looking into the “big picture” and responding to relevant social issues could strengthen meaning - integration of Ignatian values. Strong collaboration and communication among teachers in creating detailed lesson design enabled more meaningful learning among pupils. Research revealed the significant role of lesson study in creating meaningful strategies and activities which provided efficient structure in developing a chosen lesson topic. It does not only focus on the nature of the topic but also include making meaningful connections to the real world and integrate values.
Volume: 10
Issue: 4
Page: 1298-1305
Publish at: 2021-12-01

Factors of mothers' hesitation in discussing reproductive health

10.11591/ijphs.v10i4.21147
Ratih Indraswari , Zahroh Shaluhiyah , Bagoes Widjanarko , Antono Suryoputro
Reproductive health is always becoming an issue for adolescence. Lack of knowledge, permissive attitude, easy access to pornography and low parental supervision reported as a determinant of risky sexual behavior in adolescence. This study aimed to investigate mother’s perspectives in discussing reproductive health issues with their children aged 9-11 years old. The respondents were 8.046 mothers who had children aged 9-11 years old in Semarang, taken with a purposive sampling technique. Most mother (84.4%) were in adulthood, graduated from Senior High School (50.8%), unemployment (44%), and 47.2% was in low-middle income family. As much as 26.8% of mothers agreed that it is not necessary to inform their children about reproductive health. Talking about reproductive health is taboo for 41.9% of mothers and 38.5% felt awkward. Most of them (71.7%) encountered difficulties in starting reproductive health discussions with their children and 76.1% used other terms to name the genitals to feel more polite.  A mother who perceived that delivering reproductive health information is unnecessary (OR 1.44), taboo (OR 1.82), awkward (OR 1.93), and giving courtship permission (OR 1.28) to their children significantly becoming risk factors in practicing reproductive health education. Health workers should help the mothers improve their communication skills, especially in discussing reproductive health with children aged 9-11 years old.
Volume: 10
Issue: 4
Page: 801-806
Publish at: 2021-12-01

A grid interconnected nested neutral-point clamped inverter with voltage synchronization using synchronous reference frame controller

10.11591/ijape.v10.i4.pp364-372
Sirisha Bogimi
Nested neutral-point clamped multi level inverter with inter connection to grid through the synchronous reference frame (SRF) controller for synchronization of voltage to the grid is demonstrated. The system's main feature is that voltage stress in each inverter switching device is kept to a minimum, and redundant inverter switching states are utilised for neutral point and flying capacitor voltage balancing with sinusoidal pulse-width modulation (PWM) technique, synchronisation to grid voltages, and power injection with low harmonic generation. The inverter receives its input from a photovoltaic (PV) source that is coupled to DC-DC booster converters that are regulated by the maximum power point (MPP) tracking incremental conductance algorithm to maintain a constant dc voltage. The system is examined under various load conditions with MATLAB/Simulink model.
Volume: 10
Issue: 4
Page: 364-372
Publish at: 2021-12-01

Throughput performance for full-duplex DF relaying protocol in hybrid wireless power transfer systems

10.11591/ijeecs.v24.i3.pp1571-1577
Hoang-Phuong Van , Hoang-Sy Nguyen
Most of the existing studies on energy harvesting (EH) cooperative relaying networks are conducted for the outdoor environments which are mainly characterized by Rayleigh fading channels. However, there are not as many studies that consider the indoor environments whereas the state-of-the-art internet of things (IoT) and smart city applications are built upon. Thus, in this paper, we analyze a namely hybrid time-power splitting relaying (HTPSR) protocol in a full-duplex (FD) decode-and-forward (DF) battery-energized relaying network in indoor scenarios modelled by the unpopular log-normal fading channels. Firstly, we formulate the analytical expression of the outage probability (OP) then the system throughput. Accordingly, we simulate the derived expressions with the Monte Carlo method. It is worth mentioning that in our work, the simulation and the theory agree well with each other. From the simulation results, we know how to compromise either the power splitting (PS) or the time splitting (TS) factors for optimizing the system performance.
Volume: 24
Issue: 3
Page: 1571-1577
Publish at: 2021-12-01

FPGA implementation of LDPC soft-decision decoders based DCSK for spread spectrum applications

10.11591/ijece.v11i6.pp4794-4809
Fadhil S. Hasan , Mahmood F. Mosleh , Aya H. Abdulhameed
Spread spectrum (SS) communications have attracted interest because of their channel attenuation immunity and low intercept potential. Apart from some extra features such as basic transceiver structures, chaotic communication would be the analog alternative to digital SS systems. Differential chaos shift keying (DCSK) systems, non-periodic and random characteristics among chaos carriers as well as their interaction with soft data are designed based on low-density parity-check (LDPC) codes in this brief. Because of simple structure, and glorious ability to correct errors. Using the Xilinx kintex7 FPGA development kit, we investigate the hardware performance and resource requirement tendencies of the DCSK communication system based on LDPC decoding algorithms (Prob. Domain, Log Domain and Min-Sum) over AWGN channel. The results indicate that the proposed system model has substantial improvements in the performance of the bit error rate (BER) and the real-time process. The Min-Sum decoder has relatively fewer FPGA resources than the other decoders. The implemented system will achieve 10-4 BER efficiency with 5 dB associate Eb/No as a coding gain.
Volume: 11
Issue: 6
Page: 4794-4809
Publish at: 2021-12-01

Simulation of boost AC-AC converter using single-phase matrix converter

10.11591/ijape.v10.i4.pp307-314
Zeynep Bala Duranay , Hanifi Guldemir
Generally, AC-AC converters are implemented using thyristors. These converters generate harmonics and have a low power factor. To eliminate these problems matrix converters (MC) are become used as AC-AC converter. Matrix converters have the capability of being used as frequency changer, rectifier, inverter and chopper. In this work, it is proposed to achieve the desired output of AC-AC Boost converter using single phase matrix converter (SPMC). The operation of single-phase AC-AC boost converter using MC is studied in this paper. The output voltage of this boost converter is higher than the AC input supply voltage. insulated gate bipolar transistors (IGBTs) are used as the switching elements in the SPMC power circuit. Sinusoidal Pulse width modulation (SPWM) technique is applied to generate switching signals to obtain the output voltage. The model of the matrix converter is constructed in MATLAB/Simulink programming software package. The behavior of SPMC is simulated with various switching frequencies. The simulation results together with harmonic spectrum and total harmonic distortion (THD) values are presented. Successful operation of boost SPMC is achieved.
Volume: 10
Issue: 4
Page: 307-314
Publish at: 2021-12-01

Evaluating spatial and frequency domain enhancement techniques on dental images to assist dental implant therapy

10.11591/ijece.v11i6.pp5019-5033
Shashikala J. , Thangadurai N.
Dental imaging provides the patient's anatomical details for the dental implant based on the maxillofacial structure and the two-dimensional geometric projection, helping clinical experts decide whether the implant surgery is suitable for a particular patient. Dental images often suffer from problems associated with random noise and low contrast factors, which need effective preprocessing operations. However, each enhancement technique comes with some advantages and limitations. Therefore, choosing a suitable image enhancement method always a difficult task. In this paper, a universal framework is proposed that integrates the functionality of various enhancement mechanisms so that dentists can select a suitable method of their own choice to improve the quality of dental image for the implant procedure. The proposed framework evaluates the effectiveness of both frequency domain enhancement and spatial domain enhancement techniques on dental images. The selection of the best enhancement method further depends on the output image perceptibility responses, peak signal-to-noise ratio (PSNR), and sharpness. The proposed framework offers a flexible and scalable approach to the dental expert to perform enhancement of a dental image according to visual image features and different enhancement requirements.
Volume: 11
Issue: 6
Page: 5019-5033
Publish at: 2021-12-01

A performance evaluation of convolutional neural network architecture for classification of rice leaf disease

10.11591/ijai.v10.i4.pp1069-1078
Afis Julianto , Andi Sunyoto
Plant disease is a challenge in the agricultural sector, especially for rice production. Identifying diseases in rice leaves is the first step to wipe out and treat diseases to reduce crop failure. With the rapid development of the convolutional neural network (CNN), rice leaf disease can be recognized well without the help of an expert. In this research, the performance evaluation of CNN architecture will be carried out to analyze the classification of rice leaf disease images by classifying 5932 image data which are divided into 4 disease classes. The comparison of training data, validation, and testing are 60:20:20. Adam optimization with a learning rate of 0.0009 and softmax activation was used in this study. From the experimental results, the InceptionV3 and InceptionResnetV2 architectures got the best accuracy, namely 100%, ResNet50 and DenseNet201 got 99.83%, MobileNet 99.33%, and EfficientNetB3 90.14% accuracy.
Volume: 10
Issue: 4
Page: 1069-1078
Publish at: 2021-12-01

Techno-economic environmental assessment of hybrid renewable energy system in India

10.11591/ijaas.v10.i4.pp343-362
K. M. Venkatachalam , V. Saravanan
The co-ordination of non-conventional energy technologies such as solar, wind, geothermal, biomass and ocean are gaining significance in India due to more energy requirements and high greenhouse gas emission. In this assessment, the sustainability of emerging the gird isolated hybrid solar photovoltaic (PV)/wind turbine (WT)/diesel generator (DG)/battery system for Arunai Engineering College, India building is evaluated. The techno-economic and environmental research was inspected by HOMER Pro software by choosing the optimal combination depends on size of the components, renewable fraction, net present cost (NPC), cost of energy (COE) and greenhouse gas (GHG) emission of the hybrid system. From the acquired outcomes and sensitivity investigation, the optimal PV-WT-DG-battery combination has a NPC of $28.944.800 and COE $0.1266/kWh, with an operating cost of $256.761/year. The grid isolated hybrid system is environmentally pleasant with a greenhouse gas emission of 2.692 kg/year with renewable fraction of 99.9%.
Volume: 10
Issue: 4
Page: 343-362
Publish at: 2021-12-01

Optimal placement and sizing of distributed generation for loss minimization using ABC optimization

10.11591/ijape.v10.i4.pp347-354
Madhu Valavala
The distributed generation (DG) refers to the use of the nearby units of small generation or in the sleefelzentres. Revisions have shown that unfitting choice of the position and scope of the DG can lead to bigger system sufferers than DG's sufferers. Public services are already available before the high loss of energy loss and of the mediocre voltage profile, in particular developing countries cannot tolerate any increase in losses. From optimal allocation, public services in the reduction of system losses improve tension adjustment and improve delivery reliability. This article aims to minimalize the annual system's annual loss through the appropriate positioning and size of the DG units. The artificials bee colony (ABC) of EPA are inspired by the behavior of the API feeding, this method is incredibly conventional, a stroke or a peoplated stochastic optimization algorithm to meet the solution of the specified problem. At MATLAB, a probabilistic approach is simulated to reach the target indicates that the size of the DGs to be installed to reduce almost the same loss as a percentage that the situation in which the load power is considered constant.
Volume: 10
Issue: 4
Page: 347-354
Publish at: 2021-12-01

Knowledge, attitude, and practice towards COVID-19 among university students in Indonesia: A cross-sectional study

10.11591/ijphs.v10i4.21012
Sulistyawati Sulistyawati , Syamsu Hidayat , Siwi Pramatama Mars Wijayanti , Tri Wahyuni Sukesi , Siti Kurnia Widi Hastuti , Surahma Asti Mulasari , Fatwa Tentama , Rokhmayanti Rokhmayanti , Ulinnuha Yudiansa Putra , Sitti Nur Djannah
The presence of asymptomatic people exacerbates the widespread Coronavirus disease (COVID-19) transmission. The majority of them come from young people. This study aimed to explore the knowledge, attitude, and practice related to COVID-19 among university students in Indonesia, and the potential factor influenced their knowledge. A cross-sectional study involved 1,427 university students were carried out using an online survey from March 28 to April 10, 2020. A structured questionnaire consist of six sections focuses on knowledge, attitude, and preventive measure related to COVID-19 was used to collect the data. The analysis was performed using descriptive, Mann-Whitney, and Kruskal-Wallis tests. Results of the analysis indicated a significant difference in terms of mean between males and females regarding knowledge about preventing and protect others from COVID-19, the risk factor of getting COVID-19 infection, and knowledge that COVID-19 is curable. Knowledge total score among the respondent, there was a significant difference within the research group. This study demonstrates that the respondent has a basic knowledge about COVID-19 and the proper attitude, but it seems they are not consistent on practice in a particular measure.
Volume: 10
Issue: 4
Page: 735-743
Publish at: 2021-12-01

Verification and comparison of MIT-BIH arrhythmia database based on number of beats

10.11591/ijece.v11i6.pp4950-4961
Akram Jaddoa Khalaf , Samir Jasim Mohammed
The ECG signal processing methods are tested and evaluated based on many databases. The most ECG database used for many researchers is the MIT-BIH arrhythmia database. The QRS-detection algorithms are essential for ECG analyses to detect the beats for the ECG signal. There is no standard number of beats for this database that are used from numerous researches. Different beat numbers are calculated for the researchers depending on the difference in understanding the annotation file. In this paper, the beat numbers for existing methods are studied and compared to find the correct beat number that should be used. We propose a simple function to standardize the beats number for any ECG PhysioNet database to improve the waveform database toolbox (WFDB) for the MATLAB program. This function is based on the annotation's description from the databases and can be added to the Toolbox. The function is removed the non-beats annotation without any errors. The results show a high percentage of 71% from the reviewed methods used an incorrect number of beats for this database.
Volume: 11
Issue: 6
Page: 4950-4961
Publish at: 2021-12-01

Dynamic voltage restorer using sliding mode controller: Experimental studies

10.11591/ijape.v10.i4.pp337-346
Toumi Toufik , Benabedellah Abdelkader , Abdelkhalek Othmane , Allali Ahmed , Benhamou Aissa , Hafsi Oussama
The simulation and implementation of a sliding mode control strategy for a single-phase dynamic voltage restorer (DVR) to mitigate load voltage sag swell and harmonics is presented in this work. The control strategy's goal is to compensate for the required voltage by regulating the DVR's voltage via an injection transformer while keeping the load voltage constant. The ability of the DVR to achieve a good performance greatly depends on its control strategy. The controller used in this work is based on SMC theory, which consists of creating a passivation output and a storage function to use as a function of Lyapunov. The proposed control scheme of the DVR is initially evaluated in simulations using MATLAB and validated using a laboratory-scale prototype of the entire system, including a source, the DVR circuit and a load. The control scheme is implemented on a dSPACE 1104 board and the MATLAB real-time toolbox. Both the experimental results have demonstrated the effectiveness the proposed control strategy of DVR in mitigating power qualities issues and therefore enhancing the performance of the network.
Volume: 10
Issue: 4
Page: 337-346
Publish at: 2021-12-01

Power saving MAC protocols in wireless sensor networks: a survey

10.12928/telkomnika.v19i6.19148
Rafael Souza; Polytechnic Institute of Castelo Branco Cotrim , João Manuel Leitão Pires; Polytechnic Institute of Castelo Branco Caldeira , Vasco N. G. J.; Polytechnic Institute of Castelo Branco Soares , Youcef; University of Science and Technology Houari Boumediene Azzoug
In a wireless sensor network, energy is almost always the greatest limitation. Energy sources are restricted in many of the environments where nodes are deployed, limiting them to the use of batteries for power. Therefore, conserving energy is supremely important, however, such a task poses many challenges to hardware and protocol design. One of the greatest problems faced is reducing the energy consumption of the communications systems, which represents a substantial amount of the total consumption. This paper surveys the most recent schemes designed to reduce the communications module energy consumption with a focus on novel MAC protocols for ad-hoc wireless sensor networks. It initially describes the many challenges involved, then it analyses each protocol individually. Finally, the presented protocols are compared and the issues that remain open are raised for further research.
Volume: 19
Issue: 6
Page: 1778-1786
Publish at: 2021-12-01
1 2 3
...
1995 1996
Show 880 of 1996

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