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29,939 Article Results

In-depth perception of dynamic inductive wireless power transfer development: a review

10.11591/ijpeds.v12.i3.pp1459-1471
Nadia Nazieha Nanda , Mohd Shahrin Abu Hanifah , Siti Hajar Yusoff , Nadirah Abdul Rahim , Mashkuri Yaacob , Nurul Fadzlin Hasbullah
The emerging of inductive wireless power transfer (IWPT) technology provides more opportunities for the electric vehicle (EV) battery to have a better recharging process. With the development of IWPT technology, various way of wireless charging of the EV battery is proposed in order to find the best solution. To further understand the fundamentals of the IWPT system itself, an ample review is done. There are different ways of EV charging which are static charging (wired), static wireless charging (SWC) and dynamic wireless charging (DWC). The review starts with a brief comparison of static charging, SWC and DWC. Then, in detailed discussion on the fundamental concepts, related laws and equations that govern the IWPT principle are also included. In this review, the focus is more on the DWC with a little discussion on static charging and SWC to ensure in-depth understanding before one can do further research about the EV charging process. The in-depth perception regarding the development of DWC is elaborated together with the system architecture of the IWPT and DWC system and the different track versions of DWC, which is installable to the road lane.
Volume: 12
Issue: 3
Page: 1459-1471
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

LCL filter design for grid-connected single-phase flyback microinverter: a step by step guide

10.11591/ijpeds.v12.i3.pp1632-1643
Muhamad Faizal Yaakub , Mohd Amran Mohd Radzi , Maaspaliza Azri , Faridah Hanim Mohd Noh
Recently, LCL has become amongst the most attractive filter used for grid-connected flyback inverters. Nonetheless, the switching of power devices in the inverter configuration creates harmonics that affect the end application behavior and might shorten its lifetime. Furthermore, the resonance frequencies produced by the LCL network contribute to the system instability. This paper proposes a step-by-step guide to designing an LCL filter by considering several key aspects such as the resonance frequency and maximum current ripple. A single-phase grid-connected flyback microinverter with an LCL filter was designed then constructed in the MATLAB/Simulink environment. Several different parameter variations and damping solutions were used to analyze the performance of the circuit. The simulation result shows a promising total harmonic distortion (THD) value below 5% and harmonic suppression up to 14%.
Volume: 12
Issue: 3
Page: 1632-1643
Publish at: 2021-09-01

Stator flux in direct torque control using a speed and torque variation-based sector rotation approach

10.11591/ijpeds.v12.i3.pp1326-1334
Siti Azura Ahmad Tarusan , Auzani Jidin , Mohd Luqman Mohd Jamil , Kasrul Abdul Karim
A typical problem of traditional DTCs is that the stator flux fails to regulate at low running speeds. The regulation of stator flux in DTC is disrupted because of the unavoidable voltage drop across the stator resistance. As a result, one of the solutions to the problem is to use a fixed sector rotation technique. The concept is based on decreasing stator flux droop, a simple technique for changing the flux locus sector at a certain angle. This method, however, is only effective at low working speeds at one value of torque. As a result, the stator flux droop effect at various speeds as well as torque must be studied. The study is carried out in this paper using simulation (MATLAB/Simulink) and a practical setup (dSPACE board) where both have performed similar outcomes. The comparison is done between the conventional method (without a strategy) and the proposed method (with strategy). In summary, the effect of stator flux droop has been found to have an inverse linear relationship to the speed and torque variation.
Volume: 12
Issue: 3
Page: 1326-1334
Publish at: 2021-09-01

Development of a position tracking drive system for controlling PMSM motor using dSPACE 1104-based variable structure

10.11591/ijpeds.v12.i3.pp1345-1357
Tran Duc Chuyen , Nguyen Duc Dien
In industrial electric drive systems, it is common to find objects that need to solve the problem of angular position control, moving the object from one position to another asymptotically with no over-correction and guarantee. calculation of maximum fast impact. This is a multi-target optimization problem with many different solutions. This paper presents a method of constructing a PMSM motor position controller with a variable structure using dSPACE 1104 card. The system consists of a position control loop with a variable structure that is an outer loop and a speed control loop degree is the inner loop. In which, the speed adjustment loop uses adaptive law to compensate for uncertain functions and build a sliding mode observation to estimate load torque, friction and noise. The results of the simulation study were verified on Matlab-Simulink environment and experimented on dSPACE 1104 card to check the correctness of the built controller algorithm. The research results in the paper are the basis for the evaluation and setting up of control algorithms, design of electric drive systems in industry and the military.
Volume: 12
Issue: 3
Page: 1345-1357
Publish at: 2021-09-01

Performance of solar modules integrated with reflector

10.11591/ijpeds.v12.i3.pp1845-1852
Jamil Al Asfar , Ahmad Sakhrieh , Waleed Al-Nayfeh , Ahmad Ghandoor
This study investigates experimentally the performance of two-dimensional solar tracking systems with reflector using commercial silicon based photovoltaic module, with open and closed loop control systems. Different reflector materials were also investigated. The experiments were performed at the Hashemite University campus in Zarqa at a latitude of 32⁰, in February and March. Photovoltaic output power and performance were analyzed. It was found that the modified photovoltaic module with mirror reflector generated the highest value of power, while the temperature reached a maximum value of 53 ̊ C. The modified module suggested in this study produced 5% more PV power than the two-dimensional solar tracking systems without reflector and produced 12.5% more PV power than the fixed PV module with 26⁰ tilt angle.
Volume: 12
Issue: 3
Page: 1845-1852
Publish at: 2021-09-01

Designated path routing algorithm for dense wireless sensor network

10.11591/ijeecs.v23.i3.pp1520-1526
Siva Kumar Subramaniam , Amierul Syazrul Azman , Mohamad Yusry Lee , Farah Shahnaz Feroz
Due to extensive pipeline dissemination in the oil and gas refinery, the nodes need to be placed in a grid formation. As such, since most oil and gas industry applications require continuous data gathering, a heavy data stream will be introduced in the network traffic, mainly when the network density is high. As a result, performance degradation and poor energy consumption will occur. Ad hoc on-demand distance vector and optimized link state routing protocol have been simulated to investigate these issues further. Due to packet congestion, the network experiences a domino effect on the performance, such as packet loss, throughput degradation, and poor energy consumption. Thus, a tailored solution is required since oil and gas industry relies heavily on sensor data to keep track of pipelines condition to prevent anomalous events from happening. The proposed algorithm has been developed to optimize the network performance by dividing the traffic into two and by reducing the flooding during route discovery. The results have shown better network performance and energy consumption can be achieved using the proposed algorithm when compared to the others.
Volume: 23
Issue: 3
Page: 1520-1526
Publish at: 2021-09-01

A comprehensive review of distributed power system architecture for telecom and datacenter applications

10.11591/ijpeds.v12.i3.pp1535-1555
Ramesh B. Darla , Chitra A
With the dominating utility of the internet, it becomes critical to manage the efficiency and reliability of telecom and datacenter, as the power consumption of the involved equipment also increases. Much power being wasted through the power conversion stages by converting AC voltage to DC voltage and then stepping down to lower voltages to connect to information and communication technology (ICT) equipment. 48/12 VDC is the standard DC bus architecture to serve the end utility equipment. This voltage level is further processed to multiple lower voltages to power up the internal auxiliary circuits. Power losses are involved when it is converted from higher voltage to lower voltages. Therefore, the efficiency of power conversion is lower. There is a need to increase the efficiency by minimizing the power losses which occur due to the conversion stages. Different methods are available to increase the efficiency of a system by optimizing the converter topologies, semiconductor materials and control methods. There is another possibility of increasing the efficiency by changing the architecture of a system by increasing the DC bus voltage to higher voltages to optimize the losses. This paper presents a review of available high voltage options for telecom power distribution and developments, implementations and challenges across the world.
Volume: 12
Issue: 3
Page: 1535-1555
Publish at: 2021-09-01

Online efficiency optimization of IPMSM for electric vehicles

10.11591/ijpeds.v12.i3.pp1369-1378
Hanaa Elsherbiny , Mohamed Kamal Ahmed , Mahmoud A. Elwany
This paper presents an online efficiency optimization method for the interior permanent magnet synchronous motor (IPMSM) drive system in an electric vehicle (EV). The proposed method considers accurately the total system losses including fundamental copper and iron losses, harmonic copper and iron losses, magnet loss, and inverter losses. Therefore, it has the capability to always guarantee maximum efficiency control. A highly trusted machine model is built using finite element analysis (FEA). This model considers accurately the magnetic saturation, spatial harmonics, and iron loss effect. The overall system efficiency is estimated online based on the accurate determination of system loss, and then the optimum current angle is defined online for the maximum efficiency per ampere (MEPA) control. A series of results is conducted to show the effectiveness and fidelity of proposed method. The results show the superior performance of proposed method over the conventional offline efficiency optimization methods.
Volume: 12
Issue: 3
Page: 1369-1378
Publish at: 2021-09-01

A new switching look-up table for direct power control of grid connected 3L-NPC PWM rectifier

10.11591/ijpeds.v12.i3.pp1413-1421
Azziddin M. Razali , Nor Azizah Yusoff , Kasrul Abdul Karim , Auzani Jidin , Tole Sutikno
This paper presents a comprehensive and systematic approach in developing a new switching look-up table for direct power control (DPC) strategy applied to the three-phase grid connected three-level neutral-point clamped (3L-NPC) pulse width modulated (PWM) rectifier. The term of PWM rectifier used in this paper is also known as AC-DC converter. The approach provides detailed information regarding the effects of each multilevel converter space vector to the distribution of input active and reactive power in the converter system. Thus, the most optimal converter space vectors are able to be selected by the switching look-up table, allowing smooth control of the active and reactive powers for each sector. In addition, the proposed DPC utilizes an NPC capacitor balanced strategy to enhance the performance of front-end AC-DC converter during load and supply voltage disturbances. The steady state as well as the dynamic performances of the proposed DPC are presented and analyzed by using MATLAB/Simulink software. The results show that the AC-DC converter utilizing the new look-up table is able to produce almost sinusoidal line currents with lower current total harmonic distortion, unity power factor operation, adjustable DC-link output voltage and good dynamic response during load disturbance.
Volume: 12
Issue: 3
Page: 1413-1421
Publish at: 2021-09-01

From competition to collaboration: Unraveling teachers’ lesson study experiences

10.11591/ijere.v10i3.21101
Romiro G. Bautista , Wilfredo B. Baniqued
Lesson study is a professional development program among teachers. It reciprocates teachers’ development to students’ outcomes. It is also an act of leveraging classroom practices, enriching teachers’ content knowledge, and process skills and beliefs. This study explored the experiences of a group of science secondary school teachers that implemented the lesson study in their classes. Qualitative data were gathered from the informants’ interview during the implementation of the lesson study. Data were processed through document trail among the informants to ascertain the veracity of the transcribed responses, reflections, and observations. Thematic analysis revealed five themes on the experiences of the teachers in implementing the Lesson Study: developing a culture of oneness, crafting teachers’ competence through synergism, boosting teachers’ morale and confidence, refining the quality of the research lesson, and scheming avenues for critical thinking. It is, therefore, suggested that lesson study be implemented by all teachers across all subject-areas in the division and introduced among pre-service teachers to further discover its efficacy towards teachers’ development and students’ outcomes. Furthermore, it is strongly suggested that knowledgeable others be involved in the implementation of the lesson study as their presence were found significant in ensuring its success as most of the teachers are not specialized in the field that they are teaching.
Volume: 10
Issue: 3
Page: 921-929
Publish at: 2021-09-01

Enhanced model based algorithm to reinforce PV system with dynamic MPPT capability

10.11591/ijaas.v10.i3.pp261-270
Md. Ehtesham
Photovoltaic (PV) power has emerged as the most attractive resource in form of a clean and green energy. However, one major challenge associated with PV interfacing is its intermittent output characteristic which varies dramatically with the operating conditions. Thus designing an effective maximum power point tracking (MPPT) algorithm is a key aspect for optimizing PV system performance. Numerous MPPT algorithms have been proposed earlier having their own specific advantages. However, these are found to have two major limitations which have to be essentially addressed. Firstly, they become ineffective in the dynamic conditions where there is rapid change in environmental parameters like insolation and temperature. Secondly, they fail to discriminate between global and local peaks under partial shading conditions. Therefore, to achieve a reliable and efficient system operation, this paper presents an enhanced model-based (MB) algorithm that overcomes both these deficiencies. Based on new governing equations and precised estimation technique, it predetermines the MPP analytically. First simulated results are obtained where it is tested for dynamic variations of all the three parameters. Then the experimental validation is carried out on a 2 KW installed panel where real time data is recorded through CR1000 data logger and environmental parameters are sensed with elements like pyranometer and humidity sensor. A large number of experimental results are obtained for tracked MPP in the dynamic conditions, which are then summarized in tabular forms. These are finally plotted and compared with simulated results to illustrate the effectiveness of proposed MB algorithm.
Volume: 10
Issue: 3
Page: 261-270
Publish at: 2021-09-01

Interventions to improve vaccination coverage of children in hard-to-reach population: A systematic review

10.11591/ijphs.v10i3.20875
Cyntia Puspa Pitaloka , Samsriyaningsih Handayani
In the last decade, vaccination has reduced a quarter of child deaths worldwide. Vaccination coverage increased, but the coverage remains low in the hard-to-reach population. We searched articles from Pubmed MEDLINE, SCOPUS, Web of Science, and Science Direct to systematically review interventions to improve children's vaccination coverage in hard-to-reach populations. The expected outcome was vaccination coverage, which mentioned Odds Ratio, mean difference, or difference-in-difference with a 95% CI or p-value. Out of 102 articles identified, five articles from four different countries met the inclusion criteria. Four of the five studies reported a positive impact in increasing vaccination coverage. Interventions that showed good effectiveness in increasing the coverage of childhood immunizations were the application of mHealth given to vaccinators, multiple interventions involving the community, modification of immunization schedules during outreach activities, and immunization screening cards. Despite the inconsistent finding, mHealth with SMS reminders was the most effective intervention to increase vaccination coverage and relatively low-cost. More research was needed in developing a strategic intervention to increase vaccination coverage of children in hard-to-reach populations.
Volume: 10
Issue: 3
Page: 646-656
Publish at: 2021-09-01

Eating behavior and physical activity of senior citizens during the COVID-19 lockdown

10.11591/ijphs.v10i3.20827
Denson M. Liday , Mary Rose C. Liwag
A new coronavirus has arisen, causing a pandemic of serious respiratory syndrome in humans. The COVID-19 pandemic has a major effect on human health, resulting in abrupt lifestyle changes, social distances and loneliness at home. The goal of this study was to examine the immediate effect of the pandemic on eating behavior and physical activity among the elderly population aged 60 years and older. Data on the features of the senior citizens' profile, eating habits and physical activity during the lock-up were evaluated and analyzed in this report. In addition, the correlation, key and interaction effects of some of the essential variables in the analysis were also evaluated. The findings of the study revealed a need to promote eating habits that may help to minimize the health inequalities created by eating disorders. Moreover, the synergies between the various determinants of eating habits were found to be deficient. Home restrictions and confinement of the participants also reduced the overall physical activty level of the participants. Income class appeared as a factor on the interaction between eating behavior and physical activity. Recognizing these findings may be significant in developing health promotion programs for older people during the remaining period of quarantine or future ones. There is a need for health education as a response scheme to COVID-19 in low-income settings, and it is essential that approaches are contextually suitable with the vulnerable age group.
Volume: 10
Issue: 3
Page: 493-499
Publish at: 2021-09-01

Effectiveness of maternity waiting homes in increasing utilization of facility-based delivery: A systematic review

10.11591/ijphs.v10i3.20922
Absa Secka , Samsriyaningsih Handayani
To reduce the second delay contributing to maternal mortality, maternity waiting homes have been recommended for implementation especially in remote areas to help improve access to facility-based skilled delivery. Evidence of its effectiveness, however, is limited. This systematic review, therefore, aims to assess the effectiveness of the Maternity waiting home strategy in increasing utilization of facility delivery. Search for relevant articles was conducted on PubMed, Scopus, Google Scholar, Ebscohost, and Science Direct from database inception to March 30, 2021. Two reviewers independently screened the articles and assessed the quality of the studies. The identified maternity waiting home interventions and their effectiveness in improving facility-based delivery uptake were narratively synthesized and reported following the preferred reporting items for systematic reviews and meta-analysis reporting guidelines. The search yielded 670 articles of which five studies fulfilled the inclusion criteria. The three of five studies revealed that there is a significant association between Maternity waiting home use and utilization of facility-based delivery. The quality of the Maternity waiting homes significantly improved facility-based delivery uptake. Maternity Waiting Homes appear to be promising in decreasing barriers to skilled delivery attendance however the quality of evidence is low. More interventional studies of robust design are needed to clearly demonstrate its effectiveness.
Volume: 10
Issue: 3
Page: 529-536
Publish at: 2021-09-01
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