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31,456 Article Results

Optimizing PEMFC model parameters using ant lion optimizer and dragonfly algorithm: A comparative study

10.11591/ijece.v9i6.pp5295-5303
Zainuddin Mat Isa , Norkharziana Mohd Nayan , Mohd Hafiz Arshad , Nor Ashbahani Mohamad Kajaan
This paper introduced two optimization algorithms which are Ant Lion Optimizer (ALO) and Dragonfly Algorithm (DA) for extracting the Proton Exchange Membrane Fuel Cell (PEMFC) polarization curve parameters. The results produced by both algorithms are being compared to observe their performance. As a results, the ALO shows great performance compared to DA. Furthermore, these results also being compared with the results of the other reported metaheuristics algorithms. The ALO and DA presented competitive results.
Volume: 9
Issue: 6
Page: 5295-5303
Publish at: 2019-12-01

Image watermarking using discrete wavelet-tchebichef transform

10.11591/ijeecs.v16.i3.pp1416-1423
Andik Setyono , De Rosal Ignatius Moses Setiadi
Image watermarking is one of the most popular techniques for authenticating copyright on the digital image. Many research on image watermarking has proved that the joint of Discrete Cosine Transform (DCT) and Discrete Wavelet Transform (DWT) combinations can improve both imperceptibility and robustness when compared to DCT or DWT only. Discrete Tchebichef Transform (DTT) denotes an alternative transformation that has a similarity property with DCT. DTT has an advantage in reducing memory requirements during computing, so the calculation speed is much faster than DCT. This study tested the performance of DTT and DCT on non-blind image watermarking method, where DTT and DCT are performed after DWT. Based on the experimental results, this research proved that the DTT was combined successfully with DWT and very potential for further investigation because it has a computing performance much better than DCT. While the image watermarking quality, both the imperceptibility and robustness aspects were completely identical with the combination of DCT and DWT transformation.
Volume: 16
Issue: 3
Page: 1416-1423
Publish at: 2019-12-01

Actions to be taken in Mexico towards education 4.0 and society 5.0

10.11591/ijere.v8i4.20278
Jesus Alvarez-Cedillo , Mario Aguilar-Fernandez , Raul Jr. Sandoval-Gomez , Teodoro Alvarez-Sanchez
Education in Mexico has not evolved in the way it is taught and evaluated. In the historical moment that postmodernism enters, it has not been possible to adapt to Information and Communication Technologies(ICT), or rapid technological innovation, or changes and trends in the industry, to the sharing economy or the rise of distance races. In its analysis, an essential deficiency is detected in the current education models, and it is detected that educational freedom is nil or scarce, which has led to poor student performance, high youth unemployment, which cause severe social problems and the economy of the economy. The current government is working closely with the private sector to connect education and promote employment. It is necessary to grant public schools more autonomy, freedom and responsibility. This paper explains how to act so that Mexico can adapt education 4.0 with solid steps to reach society 5.0.
Volume: 8
Issue: 4
Page: 693-698
Publish at: 2019-12-01

Embedded system for upper-limb exoskeleton based on electromyography control

10.12928/telkomnika.v17i6.11670
Triwiyanto; Poltekkes Kemenkes Surabaya Triwiyanto , I Putu Alit; Universitas Airlangga Pawana , Bambang Guruh; Poltekkes Kemenkes Surabaya Irianto , Tri Bowo; Poltekkes Kemenkes Surabaya Indrato , I Dewa Gede Hari; Poltekkes Kemenkes Surabaya Wisana
A major problem in an exoskeleton based on electromyography (EMG) control with pattern recognition-based is the need for more time to train and to calibrate the system in order able to adapt for different subjects and variable. Unfortunately, the implementation of the joint prediction on an embedded system for the exoskeleton based on the EMG control with non-pattern recognition-based is very rare. Therefore, this study presents an implementation of elbow-joint angle prediction on an embedded system to control an upper limb exoskeleton based on the EMG signal. The architecture of the system consisted of a bio-amplifier, an embedded ARMSTM32F429 microcontroller, and an exoskeleton unit driven by a servo motor. The elbow joint angle was predicted based on the EMG signal that is generated from biceps. The predicted angle was obtained by extracting the EMG signal using a zero-crossing feature and filtering the EMG feature using a Butterworth low pass filter. This study found that the range of root mean square error and correlation coefficients are 8°-16° and 0.94-0.99, respectively which suggest that the predicted angle is close to the desired angle and there is a high relationship between the predicted angle and the desired angle.
Volume: 17
Issue: 6
Page: 2992-3002
Publish at: 2019-12-01

Learning styles and teaching styles determine students’ academic performances

10.11591/ijere.v8i4.20345
Nithya Dewi Subramaniam Chetty , Lina Handayani , Noor Azida Binti Sahabudin , Zuraina Ali , Norhasyimah Hamzah , Shahreen Kasim
Individuals learn in different ways using several learning styles, but lecturers may not always share material and learning experiences that match students’ learning preferences. Mismatches between learning and teaching styles can lead to disappointment with students are taking, and lead to underperformance among them. The aim of this study is to identify the learning styles of the students enrolled in Universiti Malaysia Pahang who were registered in Programming Technique course and to investigate the relationship between students’ learning styles and teachers’ teaching styles. Five lecturers and 251 students were involved in the study as participants and. Data from students were collected using Leonard, Enid’s VAK Learning Style Survey. Meanwhile, the teaching styles of the lecturers were identified using Grasha and Reichmann’s Teaching Style Survey. The findings revealed that majority of the student’s preferred visual learning style. The result also shows that the lecturers’ teaching styles give an impact towards the students’ academic performance. From this study, we can conclude that teaching styles have significant impacts on students’ learning styles and academic performances.
Volume: 8
Issue: 4
Page: 610-615
Publish at: 2019-12-01

Filtration and water reduction of methyl ester for insulation purpose

10.12928/telkomnika.v17i6.13133
A.; Andalas University Rajab , F. E.; Andalas University Putra , J. S.; Andalas University Ramadhani , M. S. I.; Andalas University Silitonga , R.; Andalas University Kurniawan , K.; Andalas University Qibran , Novison; Andalas University Novison , Melda; Andalas University L. , M. I.; Andalas University Hamid , Kiasatina; University Sains Malaysia A. , M. F.; University Sains Malaysia Akbar , Moh.; University Sains Malaysia Kamarol
An attempt to develop a monoester type insulating oil, especially methyl ester is being conducted and the current results after conducting two kinds of treatment, namely, filtration and water reduction arereported in this paper. Five different samples were prepared from methyl ester oil based on their melting point. The important properties of oil samples such as breakdown voltage, viscosity, water content, acidity, and density were tested, and are evaluated based on the standard specification of natural ester used for the transformer, ASTM D-6871. Another important property, i.e. oxidation stability was also tested and is evaluated by comparing the corresponding result of mineral oil. It is found that the breakdown voltage, the viscosity and the relative density of the oil fulfill the requirements specified by the standard, whereas other properties like water content, acidity and oxidation stability need further improvement.
Volume: 17
Issue: 6
Page: 3183-3190
Publish at: 2019-12-01

Optimization of house purchase recommendation system (HPRS) using genetic algorithm

10.11591/ijeecs.v16.i3.pp1530-1538
K.A.F.A. Samah , I.M. Badarudin , E.E. Odzaly , K.N. Ismail , N.I.S. Nasarudin , N.F. Tahar , M.H. Khairuddin
This paper presents the optimization of house purchase recommendation system (HRPS) using Genetic Algorithm.  Everyone in this world has their own dream house and plan to purchase it depending on their budget and based on the house preferences. Homebuyers face problem in comparing the house property websites according to the factors during the house survey. Subsequently, it is time-consuming in making the decision and they need to bear the transportation cost as they will need to travel to one house developer office to another. In addition, some of the homebuyers felt disappointed when their expectations were not met. Thus, in order to optimize the preferences, in this paper, we present a web-based house purchase recommendation system (HPRS) using a genetic algorithm. Then, it follows by test the functionality and usability of the system. As a result, the system found to function accordingly and obtain more than the average score of system usability scale testing. For further research, it is recommended to add more data to the database and compare with other algorithms.
Volume: 16
Issue: 3
Page: 1530-1538
Publish at: 2019-12-01

First order parallel coupled BPF with wideband rejection based on SRR and CSRR

10.12928/telkomnika.v17i6.10790
Zaid A.; Al-Mustansiriayah University Abdul Hassain , Amer Abbood; Al-Mustansiriayah University AL-Behadili , Adham R.; Uruk University Azeez
In this paper a new approach for first order Chebyshev parallel coupled Bandpass filter resonant at 1 GHz is presented to obtain better results (wideband rejection, high selectivity and low bandpass insertion loss) compared to conventional design. The proposed filter (a tri-formation consisting of CSRR, SRR and stubs of stepped impedance are loaded microstrip resonator) can be configured, by laying split ring resonator (SRR) and complementary split ring resonator (CSRR) with 50 Ω microstrip lines, in addition to effect of loading two stubs of stepped impedance around center of midline microstrip with impedance line 55.36 Ω of parallel coupled. The proposed filter produces high selectivity from passband to stopband transition equals to 307.5 dB/GHz and an excellent wide stopband performance extend from 1.22 GHz to 5 GHz (harmonics repression till for 5 ƒ0); all are bellow -20 dB excepting one transmission zero of -19 dB, that can be eliminate the harmonic superior frequencies without using any external Bandstop filter. Also, enhancement low bandpass insertion loss level, where it reaches 0.25 dB at fundamental centered frequency (ƒ0 = 0.96 GHz) with 21% bandwidth. The proposed filter is designed and simulated with computer aided of Ansoft HFSS software package which ordinarily used in microwave application.
Volume: 17
Issue: 6
Page: 2704-2712
Publish at: 2019-12-01

Computer vision for purity, phenol, and pH detection of Luwak Coffee Green Bean

10.12928/telkomnika.v17i6.12689
Yusuf; Universitas Brawijaya Hendrawan , Shinta; Universitas Brawijaya Widyaningtyas , Sucipto; Universitas Brawijaya Sucipto
Computer vision as a non-invasive bio-sensing method provided opportunity to detect purity, total phenol, and pH in Luwak coffee green bean. This study aimed to obtain the best Artificial Neural Network (ANN) model to detect the percentage of purity, total phenol, and pH on Luwak coffee green bean by using color features (red-green-blue, gray, hue-saturation-value, hue-saturation-lightness, L*a*b*), and Haralick textural features with color co-occurrence matrix including entropy, energy, contrast, homogeneity, sum mean, variance, correlation, maximum probability, inverse difference moment, and cluster tendency. The best ANN structure was (5 inputs; 30 nodes in hidden layer 1; 40 nodes in hidden layer 2; and 3 outputs) which had training mean square error (MSE) of 0.0085 and validation MSE of 0.0442.
Volume: 17
Issue: 6
Page: 3073-3085
Publish at: 2019-12-01

Power quality analysis based on simulation and MATLAB/Simulink

10.11591/ijeecs.v16.i3.pp1144-1153
Ahmed Salam Hussein , Majli Nema Hawas
This paper in existence a complete system connected to all situations power quality event, which has been achieved using MATLAB/SIMULINK and utilizing parametric equations. In electrical energy allocation system, the disturbances of power quality have emerged as an important matter for usefulness and customers. This design incorporates distribution two capacitor bank, line fault, starting of induction motor, non-linear load and transformer energizing that are usage to simulate diverse kind of voltage sag. In simulate voltage provisional through distribution network produced as a result of effect capacitor bank switching version in the general model. For clarity, this model is advanced with an integrated block and setting in which all event situations are organized for energy quality without scarifying the gist it. This model Integrated is too beneficial to simulate different energy quality waveforms. The performance of the brand new automated categorization algorithms received are appropriate for checking waveforms of power quality.
Volume: 16
Issue: 3
Page: 1144-1153
Publish at: 2019-12-01

Study on the performance indicators for smart grids: a comprehensive review

10.12928/telkomnika.v17i6.13285
Surender Reddy; Woosong University Salkuti
This paper presents a detailed review on performance indicators for smart grid (SG) such as voltage stability enhancement, reliability evaluation, vulnerability assessment, Supervisory Control and Data Acquisition (SCADA) and communication systems. Smart grids reliability assessment can be performed by analytically or by simulation. Analytical method utilizes the load point assessment techniques, whereas the simulation technique uses the Monte Carlo simulation (MCS) technique. The reliability index evaluations will consider the presence or absence of energy storage elements using the simulation technologies such as MCS, and the analytical methods such as systems average interruption frequency index (SAIFI), and other load point indices. This paper also presents the difference between SCADA and substation automation, and the fact that substation automation, though it uses the basic concepts of SCADA, is far more advanced in nature.
Volume: 17
Issue: 6
Page: 2912-2918
Publish at: 2019-12-01

Blind frequency offset estimator for OFDM systems

10.12928/telkomnika.v17i6.11957
Sakina; Badji Mokhtar-Annaba University BP 12 Atoui , Noureddine; Badji Mokhtar-Annaba University BP 12 Doghmane , Saddek; Badji Mokhtar-Annaba University BP 12, Afifi
Orthogonal Frequency Division Multiplexing (OFDM) is of great interest for the development of the fifth-generation technology. It is the cornerstone of Multiple-input multiple-output (MIMO) systems. Even though inter carrier interference (ICI) and inter symbol interference (ISI) have been processed for the fourth-generation standards, they still present a huge problem for the fifth-generation standards. This paper explores the tradeoff between the length of the cyclic prefix and the performances of the OFDM system. It also studies the effect of carrier frequency offset (CFO) on OFDM systems. A blind frequency offset estimator that uses the correlations between the remodulated sequence in the receiver side and the conventional received symbol is presented and a closed form solution is derived. The proposed estimator is derived under short interval when the correlation is high, so it has low computational complexity. Lin and Beek’s estimators are used for comparison. Simulations demonstrate the effectiveness of the proposed estimator under Rayleigh fading channel.
Volume: 17
Issue: 6
Page: 2722-2728
Publish at: 2019-12-01

Power loss reduction by arctic wolf optimization algorithm

10.11591/ijict.v8i3.pp111-116
Kanagasabai Lenin
This paper proposes Arctic Wolf optimization (AWO) algorithm to solve the optimal reactive power problem. Deeds of the Arctic wolf have been imitated to formulate the proposed algorithm. Arctic wolf also identified as the white wolf or polar wolf is a breed of gray wolf inhabitant from Melville Island to Ellesmere Island. It is average size, very smaller when compared to north western wolf, it possess whiter coloration, narrower braincase and big carnassials. Particle swarm optimization, Genetic algorithm has been used to improve the Exploration & Exploitation ability of the algorithm by utilizes flag vector & position, velocity update properties. Proposed Arctic Wolf optimization (AWO) algorithm has been tested in standard IEEE 30 bus test system and simulation results show the projected algorithms reduced the real power loss considerably.
Volume: 8
Issue: 3
Page: 111-116
Publish at: 2019-12-01

Regenerating face images from multi-spectral palm images using multiple fusion methods

10.12928/telkomnika.v17i6.12857
Raid Rafi; Northern Technical University Al-Nima , Moatasem Yaseen; Northern Technical University Al-Ridha , Farqad Hamid; Northern Technical University Abdulraheem
This paper established a relationship between multi-spectral palm images and a face image based on multiple fusion methods. The first fusion method to be considered is a feature extraction between different multi-spectral palm images, where multi-spectral CASIA database was used. The second fusion method to be considered is a score fusion between two parts of an output face image. Our method suggests that both right and left hands are used, and that each hand aims to produce a significant part of a face image by using a Multi-Layer Perceptron (MLP) network. This will lead to the second fusion part to reconstruct the full-face image, in order to examine its appearance. This topology provided interesting results of Equal Error Rate (EER) equal to 1.99%.
Volume: 17
Issue: 6
Page: 3110-3119
Publish at: 2019-12-01

Optimal volt/var control of distribution system using MOPSO

10.11591/ijeecs.v16.i3.pp1088-1095
Ramesh Babu M , C. Venkatesh Kumar , R. Sreekanth
This paper presents a novel method for solving multi-objective Volt/Var control of radial distribution system. The Volt/Var control is formulated as a multi-objective optimization problem which consists of the following objectives: minimization of real power loss, minimization of total voltage deviation and minimization of number of OLTC’s and capacitor operation and voltage fluctuations for a day-a-head in Distribution system.The Proposed MOPSO Algorithm is used to find the optimal settings of control variables such as On-Load tap changer (OLTC) and Shunt Capacitor. The proposed MOPSO algorithm is tested on a standard IEEE33-bus and 69-bus distribution system.
Volume: 16
Issue: 3
Page: 1088-1095
Publish at: 2019-12-01
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