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Information system supporting research on rubber in Thailand

10.11591/ijece.v11i2.pp1424-1430
Siriwan Kajornkasirat , Jirapond Muangprathub , Nathaphon Boonnam , Teerawad Sriklin
his research aimed to develop an information system supporting research on rubber (ISSR) in Thailand. This system was designed as a web application with responsive web design. The rubber database was developed with MySQL, used Apache Server as a Web Server and programed with PHP-script. High Chart, Google Chart API and Java Technology were used to represent an online information with graphical format. The system was tested with the actual data on rubber research in Southern Thailand. The system has been available online at URL http://www.s-cm.site/issr. There are three type of users: administrator, researcher (member) and generic user. The researcher performed data entry about research with log-in to the system using username and password provided by the automatic system via online registration form. The administrator can manage the research information. The researchers can manage their research information, use searching tool and leave comments on other member’s research. The generic users can access the system without username and password to view the research and general information on rubber. Moreover, the system generates a report on rubber research with online graphical format. In conclusion, this information system enhances investigation on rubber research in Thailand and its strategy planning for rubber plantation in the future.
Volume: 11
Issue: 2
Page: 1424-1430
Publish at: 2021-04-01

Direct control of active and reactive power for a grid-connected single-phase photovoltaic inverter

10.11591/ijpeds.v12.i1.pp139-150
Eyad Radwan , Mutasim Nour , Ali Baniyounes , Khalid S. Al Olimat , Emad Awada
This paper presents a single-phase grid-connected photovoltaic system with direct control of active and reactive power through a power management system of a Photovoltaic inverter. The proposed control algorithm is designed to allow maximum utilization of the inverter’s available KVA capacity while maintaining grid power factor and current total harmonic distortion (THD) requirements within the grid standards. To reduce the complexity and improve the efficiency of the system, two independent PI controllers are implemented to control single-phase unipolar PWM voltage source inverter. One controller is used to control the power angle, and hence the active power flow, while the other controller is used to control the reactive power, and consequently the power factor by adjusting the voltage modulation index of the inverter. The proposed system is modelled and simulated using MATLAB/Simulink. The PV inverter has been examined while being simultaneously connected to grid and local load. Results obtained showed the ability of the PV inverter to manage the active and reactive power flow at, and below rated levels of solar irradiances; resulting in an increased inverter utilization factor, and enhanced power quality. The proposed system, was capable of operating at power factors in the range of 0.9 lead or lag for reactive power compensation purposes and delivered its power at a wide range of solar irradiance variations.
Volume: 12
Issue: 1
Page: 139-150
Publish at: 2021-03-01

A dual-switch cubic SEPIC converter with extra high voltage gain

10.11591/ijpeds.v12.i1.pp199-211
Christophe Raoul Fotso Mbobda , Alain Moise Dikandé
To provide a high votage conversion ratio, conventional non-isolated DC-DC boost topologies, which have reduced voltage boost capability, have to operate with extremely high duty cycle ratio, higher than 0.9. This paper proposes a DC-DC converter which is mainly based on the narrow range of duty cycle ratio to achieve extra high voltage conversion gain at relatively reduced voltage stress on semiconductors. In addition, it does include any magnetic coupling structure. The structure of the proposed converter combines the new hybrid SEPIC converter and voltage multiplier cells. From the steady-state analysis, this converter has wide conversion ratio and cubic dependence with respect to the duty ratio and then, can increase the output voltage several times more than the conventional and quadratic converters at the same duty cycle ratio. However, the proposed dual-switch cubic SEPIC converter must withstand higher voltage stress on output switches. To overcome this drawback, an extension of the proposed converter is also introduced and discussed. The superiority of the proposed converter is mainly based on its cubic dependence on the duty cycle ratio that allows it to achieve extra high voltage gain at reduced voltage stress on semiconductors. Simulation results are shown and they corroborate the feasibility, practicality and validity of the concepts of the proposed converter.
Volume: 12
Issue: 1
Page: 199-211
Publish at: 2021-03-01

Towards design strong emergency and COVID-19 authentication scheme in VANET

10.11591/ijeecs.v21.i3.pp1808-1819
Akeel kassim leaby , A. Yassin , Mushtaq Hasson , Abdullah Rashid
The wide use of vehicular ad hoc networks (VANETs) in the last decade hasled many researchers to find  efficient and reliable methods to obtain the desired benefits and offer services, such as healthcare and traffic management. However, VANETs suffer from security issues represented by authentication and data integrity. In thispaper, we propose a robust  mutual authentication scheme based on elliptic curve cryptography (ECC), cryptography hash function, and a pseudonym. The  proposed work was twofold in focus: first, on healthcare in emergency cars which use VANETs, and second, on overcoming security issues, such as resisting familiar attacks (e.g. insider attacks and reply attacks). Because of the serious situation generated by the worldwide outbreak of the Covid-19 epidemic, we also found this research valuable in supporting global efforts to combat the rapid spread of this virus, by finding the safest and fastest routes to epidemic treatment centres for medical staff, assistance teams in medical  operations, fumigation control, and all work teams associated with disease control. This research attempts to contribute by proposing a special signal  used to define epidemic teams. The best route, fast route can be chosen by using VANETs infrastructure. This scheme also deals with metric security features, such as key management, data integrity, and data privacy. In the communication and computation  cost, we  noticed  that our proposed scheme  achieved  good results compared with the related works.
Volume: 21
Issue: 3
Page: 1808-1819
Publish at: 2021-03-01

Current mode control of single phase grid tie inverter with anti-islanding

10.11591/ijpeds.v12.i1.pp241-248
Sanjay Lakshminarayanan , Kiran Kumar B M , S. Nagaraja Rao , Pranupa S.
The aim of this paper is to explore the use of various current mode control (CMC) techniques to design a single phase grid tie inverter integrated with anti-islanding protection. Three types of CMC techniques have been discussed, namely current hysteresis control (CHC), constant frequency control (CFC) and average current mode control (ACMC). The performance of the grid tie inverter in the event of grid voltage failure is also studied to help install an anti-islanding mechanism. The proposed control techniques shall eliminate the use of Phase locked loop (PLL) control as the current reference is generated from the grid voltage itself. All three current mode control techniques of an inverter have been simulated in MATLAB/Simulink to evaluate the performance of the designed inverter. The simulated results show a current THD of less than 5% in all three methods and a good anti-islanding response.
Volume: 12
Issue: 1
Page: 241-248
Publish at: 2021-03-01

Hardware in the loop simulative setup for testing the combined heat power generating wind turbine

10.11591/ijpeds.v12.i1.pp499-510
Ihor Shchur , Vsevolod Shchur , Ihor Bilyakovskyy , Mykhailo Khai
This paper describes the design and implementation of hardware in the loop (HIL) system based on induction motor wind turbine emulator for the study of the operation of a combined heat-power (CHP) generating wind energy conversion system (WECS). The energy generation part of the WECS consists of two specially designed generators that are placed on a common vertical axis, which is connected to the induction motor through a gearbox. The first generator is an electric two-armature axial PMSG and the second one is a thermal electromagnetic retarder. The software part of the HIL setup simulates the interaction of the wind flow with a vertical axis wind turbine (VAWT) and is implemented in a programmable logic controller based on the model developed in the MATLAB/Simulink. The results of experimental studies of the CHP WECS with the created HIL simulative setup at both constant and turbulent wind speeds have shown good agreement with the corresponding results of computer simulation. The created HIL simulative setup will be used for the development of an energy management system for CHP WECS.
Volume: 12
Issue: 1
Page: 499-510
Publish at: 2021-03-01

Teachers’ feelings of safeness in school-family-community partnerships: Motivations for sustainable development in moral education

10.11591/ijere.v10i1.20798
Nguyen Thi Ngoc Lien , Nguyen Thi To Khuyen , Nguyen Thi Tho , Nguyen Ngan Hoa , Nguyen Thi Hanh , Chu Cam Tho , Tuong Duy Hai , Nguyen Van Bien
This study aims to get insights into teachers' safety feelings in families, schools, and communities’ partnerships to facilitate the Vietnam context’s moral education process. We used a survey method with the instrument having 19 Likert-scale items, namely teachers' feelings of safeness in SFC partnerships (SSFC). The data from 371 Vietnamese teachers followed a simple random sampling strategy. We conduct multiple regression analyses to get insight into the relationship between four groups of variables and teachers' feelings of safeness, namely teachers’ background, collaborated actions between teachers and families, families’ mental encouragement for teachers, and collaborated actions between families and communities. These results find that the school level, collaborated actions between teachers and families, and families’ mental encouragement for teachers are statistically significant to teachers’ feelings of safety. Moreover, the variable group of collaborated actions between teachers and families records the highest positive beta value in multiple regression analyses. In other words, the improvement of collaborated actions between teachers and families is a critical motivation to leverage teachers’ feelings of safeness in SFC partnerships. These results provide valuable information for sustainable development in moral education.
Volume: 10
Issue: 1
Page: 97-107
Publish at: 2021-03-01

Extending the three-tier constructivist learning model for alternative delivery: ahead the COVID-19 pandemic in Nigeria

10.11591/ijeecs.v21.i3.pp1673-1682
Arnold Adimabua Ojugo , Rume Elizabeth Yoro
Constructivist theory defines a learning process whereby a learner denotes meaning for him/herself as he/she learns. Its challenges inform us that focus and intervention needs to be given to our curricular and instructional material, so that we may have something to offer students in the next century in terms of scientific development, drawing us into technological isolation. Study seeks to ascertain readability of some textbooks used in the teaching of science, technology, engineering and mathematics in tertiary institutions in Delta State. We chose 72 institutions using quota sampling. To uphold the virtues of internationalization, results show we must devise strategies against de-territorializing of knowledge. And thus, redefine educational goals to meet globalization as a means of network and unification. Thus, constructivism yields and apt description of both individual, group and organizational adoption patterns of technology for teaching and learning across disciplines at the various schools and educational levels. It images exemplary practices for teaching, learning and research, highlighting evidences that links technology integration, readability and quality students learning.
Volume: 21
Issue: 3
Page: 1673-1682
Publish at: 2021-03-01

On finite-time output feedback sliding mode control of an elastic multi-motor system

10.11591/ijpeds.v12.i1.pp10-19
Pham Tuan Thanh , Tran Xuan Tinh , Dao Phuong Nam , Dao Sy Luat , Nguyen Hong Quang
In this paper, the tracking control scheme is presented using the framework of finite-time sliding mode control (SMC) law and high-gain observer for disturbed/uncertain multi-motor driving systems under the consideration multi-output systems. The convergence time of sliding mode control is estimated in connection with linear matrix inequalities (LMIs). The input state stability (ISS) of proposed controller was analyzed by Lyapunov stability theory. Finally, the extensive simulation results are given to validate the advantages of proposed control design.
Volume: 12
Issue: 1
Page: 10-19
Publish at: 2021-03-01

An ultra-low complexity of 2:1 multiplexer block in QCA technology

10.11591/ijeecs.v21.i3.pp1341-1346
Ali Hussien Majeed
The limitations related to CMOS such as power consumption and parasitic capacitance lead scientists to search for new technologies. Quantum-dot cellular automata (QCA) is a CMOS alternative technology that uses charges instead of voltage level for binary representation. In QCA, many metrics are used for circuit differentiation such as delay, complexity and area. In this work, a new simple block of 2:1 QCA-Multiplexer is proposed. The proposed block is more efficient than previous designs by 0.43%, 0.53%, 50% and 0.72 in terms of area, complexity, delay and cost. QCADesigner software is used to design and verify the proposed circuit.
Volume: 21
Issue: 3
Page: 1341-1346
Publish at: 2021-03-01

Super-twisting SMC for MPPT and grid-connected WECS based on SCIG

10.11591/ijpeds.v12.i1.pp520-531
Bouhenna Amina , Khodja Mohammed , Merabet Boulouiha Houari
This paper proposes a high-order sliding mode control (HO-SMC) with the super-twisting (ST) algorithm for maximum power point tracking (MPPT) and grid-connected wind energy conversion system (WECS), based on squirrel-cage induction generator (SCIG). The main features of this control strategy are attenuation of the chattering phenomenon inherent in first-order sliding mode control and its robustness against external and internal disturbances encountered by the wind power system. The simulation is carried out under SimPowerSystems of MATLAB/Simulink to evaluate the performance and effectiveness of the proposed control compared with conventional and fuzzy logic proportional-integral (PI) controllers for three different scenarios of disturbances, a fluctuating wind speed, a grid voltage drop, and parametric variations.
Volume: 12
Issue: 1
Page: 520-531
Publish at: 2021-03-01

Modeling and simulation of forces applied to the horizontal axis wind turbine rotors by the vortex method coupled with the method of the blade element

10.11591/ijpeds.v12.i1.pp413-420
Ibtissem Barkat , Abdelouahab Benretem , Fawaz Massouh , Issam Meghlaoui , Ahlem Chebel
This article aims to study the forces applied to the rotors of horizontal axis wind turbines. The aerodynamics of a turbine are controlled by the flow around the rotor, or estimate of air charges on the rotor blades under various operating conditions and their relation to the structural dynamics of the rotor are critical for design. One of the major challenges in wind turbine aerodynamics is to predict the forces on the blade as various methods, including blade element moment theory (BEM), the approach that is naturally adapted to the simulation of the aerodynamics of wind turbines and the dynamic and models (CFD) that describes with fidelity the flow around the rotor. In our article we proposed a modeling method and a simulation of the forces applied to the horizontal axis wind rotors turbines using the application of the blade elements method to model the rotor and the vortex method of free wake modeling in order to develop a rotor model, which can be used to study wind farms. This model is intended to speed up the calculation, guaranteeing a good representation of the aerodynamic loads exerted by the wind.
Volume: 12
Issue: 1
Page: 413-420
Publish at: 2021-03-01

Power quality improvement using fuzzy logic-based compensation in a hybrid power system

10.11591/ijpeds.v12.i1.pp576-584
Soumya Ranjan Das , Debani Prasad Mishra , Prakash Kumar Ray , Surender Reddy Salkuti , Arun Kumar Sahoo
This paper is based on the improvement of power quality (PQ) using fuel cell and fuzzy based controller. By using the proposed controller, the quality of power in the grid system especially in micro grid connected with non- linear and unbalanced load is enhanced. The configuration of the system is combined with hybrid arrangement of photovoltaic ([PV) with wind energy conversion system (WECS), fuel cell (FC) including the compressed air energy storage system (CAES) where the power management is controlled by using the distributed power sharing technique. In this proposed system the distortions in voltage at point of common coupling (PCC) is decreased by using the FC which acts as compensator in hybrid system. Reference current is developed which depends on real and reactive power of the source connected to the compensator. Based on demand of power for nonlinear load, without using any external communication interfaces, the proposed control theory can change the modes of operation and can compensate the unbalance in the system which is caused due to single-phase micro sources and load changes. The complete productive design of the micro-sources and power electronic converters are presented in the paper. The operation and performance of the proposed controller used in microgrid is validated through simulation in MATLAB/Simulink environment.
Volume: 12
Issue: 1
Page: 576-584
Publish at: 2021-03-01

Estimating one-diode-PV model using autonomous groups particle swarm optimization

10.11591/ijai.v10.i1.pp166-174
Mohammad AlShabi , Chaouki Ghenai , Maamar Bettayeb , Fahad Faraz Ahmad
In this paper, the one-diode model of a photovoltaic PV solar cell (PVSC) is estimated for an experimental characteristic curves data by using a recently proposed version of the Particle Swarm Optimization (PSO) algorithm, which is known as the Autonomous Groups Particles Swarm Optimization (PSOAG). This meta-heuristic algorithm is used to identify the model of the PVSC. The PSOAG divides the particles into groups and then, uses different functions to tune the social and cognitive parameters of these groups. This is done to show the individuals’ diversity inside the swarm. Although, these individuals do their duties as part of the society, they are not similar in terms of intelligence and ability. By using these groups, the performance of the PSO is improved in terms of convergence rate and escaping the local minima/maxima. Six versions of PSOAG algorithms were developed in this work. Therefore, nine versions of PSOAG, including these six algorithms and three newly developed PSOAG reported previously, will be used in this research to cover more social’s behaviors. The results are compared to the original PSO and other versions of PSO like conventional and Asymmetric Time-varying Accelerated Coefficient PSOs, and the improved PSO. The result shows that the proposed methods improve the performance by up to 14% in terms of root mean squared error and maximum absolute error, and by up to 20% in term of convergence rate, when these were compared to the best results obtained from the other algorithms.
Volume: 10
Issue: 1
Page: 166-174
Publish at: 2021-03-01

Noise-robust classification with hypergraph neural network

10.11591/ijeecs.v21.i3.pp1465-1473
Nguyen Trinh Vu Dang , Loc Tran , Linh Tran
This paper presents a novel version of hypergraph neural network method. This method is utilized to solve the noisy label learning problem. First, we apply the PCA dimensional reduction technique to the feature matrices of the image datasets in order to reduce the “noise” and the redundant features in the feature matrices of the image datasets and to reduce the runtime constructing the hypergraph of the hypergraph neural network method. Then, the classic graph based semisupervised learning method, the classic hypergraph based semi-supervised learning method, the graph neural network, the hypergraph neural network, and our proposed hypergraph neural network are employed to solve the noisy label learning problem. The accuracies of these five methods are evaluated and compared. Experimental results show that the hypergraph neural network methods achieve the best performance when the noise level increases. Moreover, the hypergraph neural network methods are at least as good as the graph neural network.
Volume: 21
Issue: 3
Page: 1465-1473
Publish at: 2021-03-01
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