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29,922 Article Results

Nutrient deficiency detection in Maize (Zea mays L.) leaves using image processing

10.11591/ijai.v9.i2.pp304-309
Nurbaity Sabri , Nurul Shafekah Kassim , Shafaf Ibrahim , Rosniza Roslan , Nur Nabilah Abu Mangshor , Zaidah Ibrahim
Maize is one of the world's leading food supplies. Therefore, the crop's production must continue to reproduce to fulfill the market demand. Maize is an active feeder, therefore, it need to be adequately supplied with nutrients. The healthy plants will be in deep green color to indicate it consist of adequate nutrient. Current practice to identify the nutrient deficiency on maize leaf is throught a laboratory test. It is time consuming and required agriculture knowledge. Therefore, an image processing approach has been done to improve the laboratory test and eliminate a human error in identification process. The purpose of this research is to help agriculturist, farmers and researchers to identify the type of maize nutrient deficiency to determine an action to be taken. This research using image processing techniques to determine the type of nutrient deficiency that occurs on the plant leaf. A combination of Gray-Level Co-Occurrence Matrix (GLCM), hu-histogram and color histogram has been used as a parameter for further classification process. Random forest technique was used as classifiers manage to achive 78.35% of accuracy. It shows random forest is a suitable classifier for nutrient deficiency detection in maize leaves. More machine learning algorithm will be tested to increase current accuracy.
Volume: 9
Issue: 2
Page: 304-309
Publish at: 2020-06-01

Optimal distribution of power under stress on power grid in real-time by reactive compensation-management and development in balance

10.11591/ijpeds.v11.i2.pp685-691
Tadjeddine Ali A. , Arbaoui I. , Hamiani H. , Chaker A.
The industrial development, lifestyle and modernization of the management sectors in Algeria have led to an increase in demand for electricity power in recent years and an increase in demand for the energy sector. This high demand for power has led to problems with voltage drops, particularly as regards the quality of this voltage during periods peak load. Thanks to research on the development of the electricity transmission system in the South-West region of Algeria and based on the theoretical results. We have obtained an optimal solution for the location of the regulation systems for voltage and the frequency in the substations that exhibit strong violations and periodic static destabilization, in particular, the stations at the end of the 220Kv transmission lines. The techniques of modeling and controlling the voltage per frequency (Hz/V) as well as the critical analysis variants have been studied and confirmed using advanced real-time numerical simulation.
Volume: 11
Issue: 2
Page: 685-691
Publish at: 2020-06-01

New DTC strategy of multi-machines single-inverter systems for electric vehicle traction applications

10.11591/ijpeds.v11.i2.pp641-650
Taibi Ahmed , Hartani Kada , Allali Ahmed
In high power traction system applications two or more machines are fed by one converter. This topology results in a light, more compact and less costly system. These systems are called multi-machines single-converter systems. The problems posed by different electrical and mechanical couplings in these systems (MMS) affect various stages of the systems and require control strategy to reduce adverse effects. Control of multi-machines single-converter systems is the subject of this paper. The studied MMS is an electric vehicle with four in-wheel PMS motors. A three-leg inverter supplies two permanent magnet synchronous machines which are connected to the front right and rear right wheels, and another inverter supplies the left side. Several methods have been proposed for the control of multi-machines single-inverter systems, the master-slave control structure seems best adapted for our traction system. In this paper, a new control structure based on DTC method is used for the control of bi-machine traction system of an EV. This new control has been implanted in simulation to analyze its robustness in the presence of the various load cases involved in our electric vehicle traction chain. Simulation results indicated that this structure control allowed the stability of the traction system.
Volume: 11
Issue: 2
Page: 641-650
Publish at: 2020-06-01

Fuzzy gain scheduling control apply to an RC Hovercraft

10.11591/ijece.v10i3.pp2434-2440
Huu Khoa Tran , Pham Duc Lam , Tran Thanh Trang , Xuan Tien Nguyen , Hoang-Nam Nguyen
The Fuzzy Gain Scheduling (FGS) methodology for tuning the Proportional – Integral – Derivative (PID) traditional controller parameters by scheduling controlled gains in different phases, is a simple and effective application both in industries and real-time complex models while assuring the high achievements over pass decades, is proposed in this article. The Fuzzy logic rules of the triangular membership functions are exploited on-line to verify the Gain Scheduling of the Proportional – Integral – Derivative controller gains in different stages because it can minimize the tracking control error and utilize the Integral of Time Absolute Error (ITAE) minima criterion of the controller design process. For that reason, the controller design could tune the system model in the whole operation time to display the efficiency in tracking error. It is then implemented in a novel Remote Controlled (RC) Hovercraft motion models to demonstrate better control performance in comparison with the PID conventional controller.
Volume: 10
Issue: 3
Page: 2434-2440
Publish at: 2020-06-01

Development of stereo matching algorithm based on sum of absolute RGB color differences and gradient Matching

10.11591/ijece.v10i3.pp2375-2382
Rostam Affendi Hamzah , M. G. Yeou Wei , N. Syahrim Nik Anwar
This paper proposes a new stereo matching algorithm which uses local-based method. The Sum of Absolute Differences (SAD) algorithm produces accurate result on the disparity map for the textured regions. However, this algorithm is sensitive to low texture areas and high noise on images with high different brightness and contrast. To get over these problems, the proposed algorithm utilizes SAD algorithm with RGB color channels differences and combination of gradient matching to improve the accuracy on the images with high brightness and contrast. Additionally, an edge-preserving filter is used at the second stage which is known as Bilateral Filter (BF). The BF filter is capable to work with the low texture areas and to reduce the noise and sharpen the images. Additionally, BF is strong  against the  distortions due to high brightness and contrast. The proposed work in this paper produces accurate results and performs much better compared with some established algorithms. This comparison is based on the standard quantitative measurements using the stereo benchmarking evaluation from the Middlebury.
Volume: 10
Issue: 3
Page: 2375-2382
Publish at: 2020-06-01

Multi-objective solution with PSO algorithm for minimization of torque ripple and speed settling time by using solar-fed 11,9 and 3-level multi-level inverter with vector control of induction motor

10.11591/ijpeds.v11.i2.pp827-832
Shashibhushan G. , Savita Sonoli
The 11,9 & 3-level cascaded multi-level inverter is fed with vector control of induction motor. The speed performance of the machine is dependent on the PI controller used for speed control. Regulation of speed can go till 5% is allowable. If the PI controller parameters are not optimal the speed error gets increase. The torque ripple can be reduced by using the multilevel inverter. More than that the PI controller output is related with torque. So, the problem is formulated with reduction of settling time of speed and torque ripple. The Multi-objective Particle Swarm Optimization (MPSO) algorithm is used to solve the problem. And the performances are compared with PI controller and PSO-PI control of vector control drive. MATLAB is used to solve the entire system.
Volume: 11
Issue: 2
Page: 827-832
Publish at: 2020-06-01

Model of organizational abilities among secondary school teachers

10.11591/ijere.v9i2.20549
Dona Ningrum Mawardi , C. Asri Budiningsih , Sugiman Sugiman , Habibi Habibi
This study confirms the correlation model constructed among organizational abilities variables of secondary school teachers. The organizational abilities variables are: organizational commitment, and professional commitment, job satisfaction, and job performance. The samples are secondary school teachers selected using purposive sampling techniques. Data were collected through a rating scale questionnaire (1-5) and analyzed using Lisrel 8.0 program. The results show that professional commitment has a significant effect on organizational commitment and job satisfaction with values of 2.72 and 2.60. Other findings that organizational commitment and job satisfaction have an effect on job performance with values of 2.36 and 2.02. Empirically, the results concluded that the correlation among the variables theoretically fulfilled the fit criteria.
Volume: 9
Issue: 2
Page: 407-414
Publish at: 2020-06-01

Novel nonlinear control structure for vector control of SPIM drive using BS PCH

10.11591/ijpeds.v11.i2.pp1099-1108
Ngoc Thuy Pham
This paper presents a novel structure combining the port-controlled Hamiltonian (PCH) and Backstepping (BS) nonlinear control for the vector control of the six-phase induction motor (SPIM). In this new scheme, to improve the outer loop’s robustness, the BS technique using the integral tracking errors action is proposed in the speed and flux controllers design. The advantage of this proposed control law is not to increase the complexity of differential equation resolution due to being not increased system states numbers. To enhance more the performance of SPIM drives (SPIMD), port-controlled Hamiltonian (PCH) scheme is used in the inner current loop controllers. In this proposed PCH current controller, the stabilization of controller is achieved via system passivity. In that, the interconnection and damping matrix functions of PCH system are shaped so that the physical (Hamiltonian) system structure is preserved at the closed loop level and the closed loop energy function is equal to the difference between the physical energy of the system and the energy supplied by the controller. The proposed control design is based on combination PCH and BS techniques improve significantly performance and robustness. The proposed speed control scheme is validated by Matlab-Simulink software.
Volume: 11
Issue: 2
Page: 1099-1108
Publish at: 2020-06-01

Ransomware protection in IoT using software defined networking

10.11591/ijece.v10i3.pp3166-3175
Azka Wani , S. Revathi
Internet of things (IoT) is the network of physical objects connected to provide various services. IoT is expanding rapidly, and is positively influencing many areas. The impact of IoT is evident in medical field, manufacturing units and livestock. The IoT is also vulnerable to many cyber threats, owing to its limited resources and battery operation. In contemporary times the security threats like DDoS, botnet malware, man in the middle, flood attacks and ransomware are affecting the smooth functioning of IoT. Ransomware has emerged as one of the biggest threat in cyber world. Ransomware is a type of malware that stops the access to files by encrypting them and decrypts the files only when a ransom is paid. The negligence towards the IoT ransomware can result in disastrous outcomes. In this paper, the growth of ransomware attacks for past few years is shown with special focus on ransomwares threatening IoT. A detection mechanism for IoT ransomware attack is presented that is designed after study of ransomware for IoT. The proposed model monitors the incoming IoT traffic through Software Defined Network (SDN) gateway. It uses policies framed in SDN controller for detection and alleviation of ransomware in IoT.
Volume: 10
Issue: 3
Page: 3166-3175
Publish at: 2020-06-01

The effect of static and dynamic eccentricities on the performance of flux reversal permanent magnet machine

10.11591/ijpeds.v11.i2.pp634-640
Ahlam Luaibi Shuraiji
This study investigates the effect of static and dynamic eccentricities on the performances of flux reversal permanent magnet (FRPM) machine with even rotor pole number, i.e. FRPM machine with 12/10 stator/rotor combination. No-load and load performances of the machine are investigated under three rotor operating conditions including centricity, static eccentricity and dynamic eccentricity. The investigation has been carried out using 2D-FEA. It has been revealed that the 12/10 FRPM machine under normal operating condition has no unbalanced magnetic force, due to the even pole number of the rotor. On the other hand, such undesirable feature would be presented in the 12/10 FRPM machine as a result of the existing of static and dynamic eccentricities.  Both static and dynamic eccentric machines exhibit unbalanced three-phase flux linkage as well as back-EMF.  Moreover, three operating conditions of the investigated machine have the same fundamental cogging torque harmonic. However, low order harmonics are existed in the static and dynamic centric machines and are not found in the centric machine. Furthermore, about 16% less torque ripple delivered by the centric machine compared with both static and dynamic counterparts.
Volume: 11
Issue: 2
Page: 634-640
Publish at: 2020-06-01

Theoretical approach model of building integrated photovoltaic thermal air collector

10.11591/ijpeds.v11.i2.pp1002-1010
Ahmad Fudholi , Muhammad Zohri , Ivan Taslim , Merita Ayu Indrianti , Intan Noviantari Manyoe
Over recent years the photovoltaic technology has obtained significant development, especially in building integrated photovoltaic thermal (BIPVT) system. Photovoltaic thermal (PVT) air collectors are advantageous because of their efficiency. Various studies have been conducted to determine the ideal parameters of PVT air collectors. Few theoretical approach models of PVT air collector systems were used to help detect occurrences in a PVT collector system and calculate the optimal parameters. The heat transfer and energy balance of PVT air collectors were analysed and reviewed based on the model, quantity of cover, channels and forms of the collector. A mathematical model was developed to describe actual working situations and to examine new shut PVT collectors. The first law of thermodynamics is the principal equation in the model. Different analysis methods were utilised to evaluate PVT performances, which are generally based on energy and exergy analyses. This review focuses on theoretical approach model of single-pass PVT air collector.
Volume: 11
Issue: 2
Page: 1002-1010
Publish at: 2020-06-01

Transmission line fault identification and classification with integrated FACTS device using multiresolution analysis and naïve bayes classifier

10.11591/ijpeds.v11.i2.pp907-913
Elhadi Emhemed Aker , Mohammad Lutfi Othman , Ishak Aris , Noor Izzri Abdul Wahab , Hashim Hizam , Osaj Emmanuel
This paper is present a novel approach for solving the pending under-reach problem encountered by distance relay protection scheme in the 3rd zones protection coverage for a midpoint STATCOM compensated transmission lines. The propose transmission line model is develop in Matlab for analyzed feature extraction using Discrete Wavelet multiresolution analysis approach. Extracted feature from standard deviation and entropy energy contents of SLG transient faults current at location beyond the integrated STATCOM used for machine learning algorithm model building using WEKA software. The Naïve Bayes classifier model perform best with robustness prediction and detection of faults with quick convergence even with less training data. The outperformance of the proposed classifier has been 100 % for the relay algorithm modification for under-reach problem elimination in 3rd zones protection coverage.
Volume: 11
Issue: 2
Page: 907-913
Publish at: 2020-06-01

Deep learning in non coding variant (a brief overview)

10.11591/ijeecs.v18.i3.pp1432-1438
Lee Kuan Xin , Afnizanfaizal Abdullah
The 21st centuries were deemed to be the era of big data. Data driven research had become a necessity. This hold true not only in the business world, yet also in the field of biomedical world. From a few years of biological data extraction and derivation. With the advancement of Next Generation Sequencing, genomics data had grown to become an ambiguous giant which could not keep up with the pace of its advancement in it analysis counter parts. This results in a large amount of unanalysed genomic data. These genomic data consist not only plain information, researcher had discovered the potential of most gene called the non-coding variant and still failing in identifying their function. With the growth in volume of data, there is also a growth of hardware or technologies. With current technologies, we were able to implement a more complex and sophisticated algorithm in analysis these genomics data. The domain of deep learning had become a major interest of researcher as it was proven to have achieve a significant success in deriving insight from various field. This paper aims to review the current trend of non-coding variant analysis using deep learning approach.
Volume: 18
Issue: 3
Page: 1432-1438
Publish at: 2020-06-01

Enhancement of voltage regulation using a 7-Level inverter based electric spring with reduced number of switches

10.11591/ijpeds.v11.i2.pp555-565
K. K. Deepika , J. Vijaya Kumar , G. Kesava Rao
Electric Springs has been testified recently to enhance voltage regulation in distribution systems using demand side management. In this paper, a 7-level Multilevel Inverter (MLI) with a resonant switched capacitor Converter based on sinusoidal PWM, is implemented to analyze the performance of an electric spring under voltage variations at PCC. By the proposed MLI based ES, voltage regulation of critical load voltage is studied for voltage sag and swell conditions. Remarkable features of the proposed topology are maintaining voltage balance in input capacitors and reduction of power components. Simulations have been done in MATLAB/Simulink on distribution system with DGs equipped with MLI based ES under line voltage anomalies. Tested results are analyzed with THD% in critical load voltage.
Volume: 11
Issue: 2
Page: 555-565
Publish at: 2020-06-01

A modified grey wolf optimizer for improving wind plant energy production

10.11591/ijeecs.v18.i3.pp1123-1129
Mohd Zaidi Mohd Tumari , Mohd Helmi Suid , Mohd Ashraf Ahmad
The main problem of existing wind plant nowadays is that the optimum controller of single turbine degrades the total energy production of wind farm when it is located in a large wind plant. This is owing to its greedy control policy that can not cope with turbulence effect between turbines. This paper proposes a Modified Grey Wolf Optimizer (M-GWO) to improvise the controller parameter of an array of turbines such that the total energy production of wind plant is increased. The modification employed to the original GWO is in terms of the updated mechanism. This modification is expected to improve the variation of exploration and exploitation rates while avoiding the premature convergence condition. The effectiveness of the M-GWO is applied to maximize energy production of a row of ten turbines. The model of the wind plant is derived based on the real Horns Rev wind plant in Denmark. The statistical performance analysis shows that the M-GWO provides the highest total energy production as compared to the standard GWO, Particle Swarm Optimization (PSO) and Safe Experimentation Dynamics (SED) methods.
Volume: 18
Issue: 3
Page: 1123-1129
Publish at: 2020-06-01
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