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

Measurement push and pull forces on automatic liquid dispensers

10.11591/ijece.v11i6.pp4825-4832
Agustami Sitorus , Eko K. Pramono , Yusnan H. Siregar , Ari Rahayuningtyas , Novita D. Susanti , Irwin S. Cebro , Ramayanty Bulan
Since the COVID-19 pandemic, automated liquid dispensers have been increasingly developed to assist transmission prevention. However, data availability of automatic liquid dispenser mechanism's technical characteristics is not yet widely available. This causes frequent over or under design in its development. Therefore, we specifically measure push and pull forces engineering characteristics generated by the automatic liquid dispenser mechanism. A wire mechanism-based automatic liquid dispenser apparatus was used to experiment. A load-cell sensor was used to detect the force that occurs from a servo motor controlled by a microcontroller. The force data (push and pull) will be sent directly to the database server cloud with a recording frequency of every second. Three types of fluid treatment levels are used i.e. water, liquid soap, and hand sanitizer gel. Three types of fluid volume treatment levels used were 50 ml, 150 ml, and 250 ml. Each treatment level combination is carried out at the servo motors rotation steps 180°, 150°, 120°, 90°, 60°, and 30°. The results show that no significant differences were found in maximal forces required to release the water, liquid soap, and hand-sanitizer gel. It is also known that the volume of the fluid has a very significant effect on the amount of push and pull forces generated.
Volume: 11
Issue: 6
Page: 4825-4832
Publish at: 2021-12-01

Managing educational institutions: School heads’ leadership practices and teachers’ performance

10.11591/ijere.v10i4.21518
Cherry Joy C. Aquino , Bonimar T. Afalla , Fitzgerald L. Fabelico
School heads are agents of change who contribute a major impression on the educational milieu through their information-sharing methods, creating supportive social connections, participating in mentoring programs, and fostering progress. Hence, this study ascertained the interrelation between the public school head’s leadership practices and teachers’ performance. As correlation research, simple random sampling was used to calculate the sample size for teachers, while total enumeration was used for school heads. A structured questionnaire was developed to gather the necessary information that reinforced the theme of this analysis. Weighted mean was used to ascertain the level of leadership practices of school heads and the level of teacher performance. T-test, F-test, post-hoc test, and Pearson r were employed to establish the degree of association between and among variables. This study concluded that the variation in leadership practices experienced by school heads and teachers is absolutely vital, confirming that their reactions are fundamentally better. Teachers' performance is consistent irrespective of age, educational achievement, or significant contributions. In terms of teaching status and number of years of experience, head teachers have improved teaching efficiency than teachers and master teachers. Teachers with shorter relevant experience showed poorer educational quality relative to those who spent more time in the school system. School heads who have obtained their doctorate degrees get a greater level of leadership practices than the holders of master's degrees. The very productive performance of teachers stays the same, regardless of whether the school heads exhibit a very high degree of authentic leadership.
Volume: 10
Issue: 4
Page: 1325-1333
Publish at: 2021-12-01

Sensorless nonlinear sliding mode control of the induction machine at very low speed using FM-MRAS observer

10.11591/ijpeds.v12.i4.pp1987-1998
Mokhtar Touam , Mohammed Chenafa , Soufyane Chekroun , Ramzi‎ Salim
The induction motor is complex because its dynamic is nonlinear, multivariable and highly coupled. In addition, the induction motor (IM) controller design can be degraded due to wide ranges operating speed specially in low and near-zero speeds and also to variation of interval parameters such as the stator resistance change because of stator heating during operation. Our contribution is the use of a nonlinear sliding mode control using a fuzzy mutual reference adaptive system observer based on two fuzzy adaptation mechanisms to estimate both rotor speed and stator resistance. The proposed work was verified and compared by simulation and tested in various ranges of speed with motor and regenerating regions of operation. The results show that the proposed approach has proved good effectiveness in tracking and observation.
Volume: 12
Issue: 4
Page: 1987-1998
Publish at: 2021-12-01

An optimal allocation of UPFC and transient stability improvement of an electrical power system: IEEE-30 buses

10.11591/ijece.v11i6.pp4698-4707
Ali Abdul Razzaq Altahir , Marwa M. Marei
Recently, the expansion process of electrical networks has become crucial with the development of electrical systems. One of the active solutions to progress the performance of an electrical system is the usage of flexible AC transmission system (FACTS). As a new generation of telecommunications and power electronics technology, FACTS has provided a new viewpoint to increase the bearing capacity, better control the grid, and reduce costs. The unified power flow controller had a multi-purpose unit that could command the scenario of providing or consuming the power components and maintaining the bus voltage. The study's novelty resided in presenting a modified particle swarm optimization algorithm-based software system and applied a Newton-Raphson load flow solution to get the best solutions for optimal allocation of unified power flow controllers (UPFC). This study has focused on the functions of the UPFC electrical system with corresponding effects on transient stability. MATLAB software (Simulink/code) and excel sheet were performed on IEEE 30 buses as a case study. It has been shown the effectiveness of UPFC with fast response and autonomous command on the flow of power components. The dynamic response for stability improvement for some network buses had been verified to ensure the robustness of UPFC during a sudden disturbance in electrical load. The case study results illustrate that the number of UPFC increased with load increased by (14% and 21%).
Volume: 11
Issue: 6
Page: 4698-4707
Publish at: 2021-12-01

Artistic feasibility research on a standalone hybrid solar/wind system based on IncCond algorithm under variable load demands-a case study: South Algeria

10.11591/ijece.v11i6.pp4649-4658
Oumelkhier Bouchiba , Tahar Merizgui , Bachir Gaoui , Saliha Chettih , Ali Cheknane
The aim of this research study is to describe the hybrid renewable energy resources, the photovoltaic and the wind turbine are utilized to produce AC power for a Sahara Hassi R'Mel region in south of Algeria is optimally designed. Hybrid power generation systems are an operative solution for the variable generated power of renewable energy sources. In the new design, the ability circuit and the surveillance regulation of the presented grid-connected hybrid power system simulation is examined via MATLAB/Simulink. To detect the feasibility of the controlled system, this system is studied under various solar radiation and wind speed profiles. On the basis of the results, good tracking with a high accuracy rate is obtained after using filtering component by enhancing the different topology configurations in the expression of comparison voltage (V), and power (W). Overtime, the overall system efficiency is enhanced compared to the MPPT control system. The obtained simulation results for the incremental conductance PV/Wind MPPT controller have accomplished high effective system achievements. IncCond method is appropriate for working in vastly variable weather conditions with easy design, high tracking velocity, and minimum step count.
Volume: 11
Issue: 6
Page: 4649-4658
Publish at: 2021-12-01

Design and simulation of 5kW BLDC motor with half-buried permanent magnets using an existing stator body

10.11591/ijpeds.v12.i4.pp2030-2043
Budi Azhari , Pudji Irasari , Puji Widiyanto
This paper proposes a design of a 5 kW, 100 volts brushless direct current (BLDC) motor using an existing stator connected to an inverter and equipped with Hall sensors. The stator is a radial flux motor-type with 54 slots positioned at the outer side of the machine. In this case, the design is focused on the rotor components and winding configuration. However, the inverter aspects are also taken into account. At the same time, it considers the expected outputs: voltage, power, speed; and some limitations: maximum current and flux density. Finite element magnetic-based simulation is performed to extract the magnetic flux distribution, and analytical calculations are then conducted to obtain the output values and characteristics. The results show the BLDC motor at nominal speed produces 5.1 kW output power with 122.34 V voltages, 97.09% efficiency, and torque of 32.82 Nm. The maximum torque and rotation speeds are 51.39 Nm and 4,150 rpm respectively, while the peak-to-peak cogging force is 1.35 Nm. It can be concluded that the BLDC motor has a good performance and is compatible with the connected inverter.
Volume: 12
Issue: 4
Page: 2030-2043
Publish at: 2021-12-01

Using CaCO3-doped package to improve correlated color temperature uniformity of white light-emitting diodes

10.11591/ijece.v11i6.pp4817-4824
My Hanh Nguyen Thi , Nguyen Thi Phuong Loan , Thuc Minh Bui , Hoang Van Ngoc
The white light-emitting diode (WLED) has been the most advance lighting method currently, however, the fabrication process of this configuration still has drawbacks which negatively affect its color quality. This research was conducted to provide a method for WLED’s lighting output enhancement. Since CaCO3 particles are excellent for thermal stability enhancement, especially when being combined with an adhesive substance, we decided to integrate CO3 particles into resin matrix such as melamine formaldehyde (MF) and investigate their influences on the optical properties, including color uniformity and lumen output, of the WLED. The results showed that CaCO3 and MF resin are beneficial to the light scattering efficiency, which results in higher luminous flux and chromatic quality for WLED packages. In addition to that, the appropriate amounts of MF resin and CaCO3 for reaching the best lumen efficiency and color quality are figured out at 1% and 10%, respectively. Moreover, another advantage of using MF resin and CaCO3 for fabricating WLEDs is cost effectiveness. Hence, it has turned out that CaCO3 and MF resins can be potential materials for next high-quality WLED generations.
Volume: 11
Issue: 6
Page: 4817-4824
Publish at: 2021-12-01

Overall fuzzy logic control strategy of direct driven PMSG wind turbine connected to grid

10.11591/ijece.v11i6.pp5515-5529
Mhamed Fannakh , Mohamed Larbi Elhafyani , Smail Zouggar , Hassan Zahboune
The fuzzy logic strategies reported in the literature about the control of direct drive permanent magnet synchronous generator (PMSG) connected to grid are limited in terms of inclusiveness and efficiency. So an overall control based on fuzzy logic and anti-windup compensation is proposed in this paper. Aiming at the inadequate of hill climb search (HCS) MPPT with fixed step size, the fuzzy logic is introduced in the stage of "generating rotor speed reference" to overcome the oscillations and slowness in traditional method. PI controllers are replaced by anti-windup fuzzy logic controllers in the "machine side control" stage and in "grid side control" stage to pertinently regulate the reference parameters. Then comparison tests with classical methods are implemented under varying climatic conditions. The results obtained demonstrate that the developed control is superior to other methods in response time (less than 4.528E-04 s), precision (an overshoot about 0.41%) and quality of produced energy (efficiency is 91%). The study verifying the feasibility and effectiveness of this algorithm in PMSG wind turbine connected to grid.
Volume: 11
Issue: 6
Page: 5515-5529
Publish at: 2021-12-01

Narrow-band filter for satellite communication systems

10.11591/ijict.v10i3.pp198-203
Alexander Vladimirovich Strizhachenko , Sergey Nikolayevich Shulga
Design narrow-band compact filters, based on high-quality waveguide-dielectric resonators with anisotropic materials is the subject of this paper. Filter represents a segment of a rectangular waveguide rotated around the longitudinal axis of the waveguide 90 degrees and containing one or more dielectric inserts that completely fill the resonator along the narrow wall of the waveguide and partially along the wide one. A distinctive feature of the proposed filter is higher slope steepness of the amplitude-frequency characteristic, and high manufacturability in the centimeter range. The designed narrow-band filter satisfies contradictory requirements: it combines narrow bandwidth (≈ 0.1% of center frequency f0) with low passband insertion loss (≤ 1 dB).
Volume: 10
Issue: 3
Page: 198-203
Publish at: 2021-12-01

Sophisticated and modernized library running system with OCR algorithm using IoT

10.11591/ijeecs.v24.i3.pp1680-1691
D. Karthikeyan , Arumbu V. P. , K. Surendhirababu , K. Selvakumar , P. Divya , P. Suhasini , R. Palanisamy
An internet of things (IoT) is an exclusive method, were its impact on the enactments of human life is very trendy. This research on library control system operates on the basis of IoT and optical character recognition (OCR) algorithm rules and its training. A closed-circuit television (CCTV) watched mechanism is created to control the book issuing and returning phenomenon via tag studying system in the library. In this proposed work text file is converted into an audio file. This audio file is being played and the contents of the book can be heard via the headset. This unique function of the OCR helps blind people. Now a days OCR widely focused in machine processes such as machine transformation, text to speech extraction and text data mining. It utilized in various area of research in artificial intelligence, computer vision and pattern recognition. Using OCR to scan the damaged book in the library converted into pdf format the book gets new life and sharing the contents to multiple readers. In this paper aims to implement IoT based library management system to maintaining books in digital format.
Volume: 24
Issue: 3
Page: 1680-1691
Publish at: 2021-12-01

The implementation of social customer relationship management for tourism information system

10.11591/ijeecs.v24.i3.pp1578-1588
Ali Ibrahim , Dwi Rosa Indah , Devi Indra Meytri
Semambu island village, Ogan Ilir regency, south Sumatra has been used as an agricultural and livestock education tour destination since November 2017 and there has been no customer data management since then. The use of social media as a promotional tool has not been done to its maximum potential. This can be seen from 189 people who liked its Facebook page or 11.05% out of the reached users, 192 followers or 11.23% and those who interacted as many as 114 people or 6.67% from the total users. Meanwhile, there were 709 followers on its Instagram which consisted of 48% men and 52% women at the time of the study. This research applied social customer relationship management (social CRM) in a website-based system. The waterfall model development method supported the customer relations management by utilizing Facebook and Instagram to improve customer relationships in providing travel information, knowing interest and listening to complains as well as their suggestions based on interactions with the social media users as existing and prospective customers.
Volume: 24
Issue: 3
Page: 1578-1588
Publish at: 2021-12-01

The taxi function

10.11591/ijra.v10i4.pp319-325
Alicia C. Sánchez
This paper investigates the lane keeping control and the lateral control of autonomous ground vehicles, robots or the like considering the road agency formation unit (RAFU) functions. A strategy based knowing the real position of several points of the trajec- tory is proposed to achieve the lateral control purpose and maintain the lane keeping errors within the prescribed performance boundaries. The RAFU functions are applied to achieve these goals. The stability of these functions, their applicability to approach any arbitrary trajectory and the easy control of the possible error made on the approx- imation are useful advantages in practice.
Volume: 10
Issue: 4
Page: 319-325
Publish at: 2021-12-01

The epidemiology of burn injury among children during COVID-19 19 pandemic and WFH policy in Malang, East Java, Indonesia

10.11591/ijphs.v10i4.21014
Herman Yosef Limpat Wihastyoko , Arviansyah Arviansyah , Erdo Puncak Sidarta
Work from home (WFH) mandate is one of the major changes known during this pandemic, aimed as a preventive way to mitigate the spread of the COVID-19 virus. This study aimed to observe the characteristics of pediatric burn injury during COVID-19 pandemic and WFH mandate's impact on pediatric burn injury admission at some Hospital burn centers in Malang. Every patient’s age, gender, clinical characteristics, parent's background, and other variables such as the possession of siblings, response time using our burn registry form, and comparative analysis of the incident in WFH housewife mother were assessed. The majority were in the group age of under five years old group age (70%) with a mean of 5.5 years. The most frequent part of the burn injured is extremity 36.7%, and hot liquid dominates as the cause of the injury 73.3% with the total body surface area of burn injury group >10% is the most common 56.7%. The burn injury incident happened more frequently in mothers with children less than two in both groups. This study showed that the increase in increasement of the pediatric burn injury during COVID-19 pandemic between housewife mother and WFH mother has no significant difference also showed that parent especially mother unable to supervise the children during WFH. Strategies to mitigate pediatric burn injuries during WFH should be thoughtfully implemented.
Volume: 10
Issue: 4
Page: 744-750
Publish at: 2021-12-01

Realtime autonomous navigation in V-Rep based static and dynamic environment using EKF-SLAM

10.11591/ijra.v10i4.pp296-307
Umme Hani , Lubna Moin
Localization in an autonomous mobile robot allows it to operate autonomously in an unknown and unpredictable environment with the ability to determine its position and heading. Simultaneous localization and mapping (SLAM) are introduced to solve the problem where no prior in formation about the environment is available either static or dynamic to achieve standard map-based localization. The primary focus of this research is autonomous mobile robot navigation using the extended Kalman filter ( EKF )-SLAM environment modeling tech nique which provides higher accuracy and reliability in mobile robot localization and mapping result s . In this paper , EKF-SLAM performance is verified by simulations performed in a static and dynamic environment designed in V-REP i.e. , 3D Robot simulation environment. In this work SLAM problem of two-wheeled differential drive robot i.e. , Pioneer 3-DX in indoor static and dynamic environment integrated with Laser range finder i.e. , H okuyo URG-04LX-UG01, LIDAR , and Ultrasonic sensors is solved. EKF-SLAM scripts are developed using MATLAB that is linked to V-REP via r emote API f eature to evaluate EKF-SLAM performance. The reached results confirm the EKF-SLAM is a reliable approach for r eal-time autonomous navigation for mobile robots in comparison to other techniques.
Volume: 10
Issue: 4
Page: 296-307
Publish at: 2021-12-01

A one decade survey of autonomous mobile robot systems

10.11591/ijece.v11i6.pp4891-4906
Noor Abdul Khaleq Zghair , Ahmed S. Al-Araji
Recently, autonomous mobile robots have gained popularity in the modern world due to their relevance technology and application in real world situations. The global market for mobile robots will grow significantly over the next 20 years. Autonomous mobile robots are found in many fields including institutions, industry, business, hospitals, agriculture as well as private households for the purpose of improving day-to-day activities and services. The development of technology has increased in the requirements for mobile robots because of the services and tasks provided by them, like rescue and research operations, surveillance, carry heavy objects and so on. Researchers have conducted many works on the importance of robots, their uses, and problems. This article aims to analyze the control system of mobile robots and the way robots have the ability of moving in real-world to achieve their goals. It should be noted that there are several technological directions in a mobile robot industry. It must be observed and integrated so that the robot functions properly: Navigation systems, localization systems, detection systems (sensors) along with motion and kinematics and dynamics systems. All such systems should be united through a control unit; thus, the mission or work of mobile robots are conducted with reliability.
Volume: 11
Issue: 6
Page: 4891-4906
Publish at: 2021-12-01
1 2 3
...
1995 1996
Show 878 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