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29,939 Article Results

Detailed modelling and simulation of single-phase transformers for research and educational purposes

10.11591/ijeecs.v24.i1.pp37-49
Saif Sabah Sami , Mazin T. Muhssin , Zeyad Assi Obaid , Ali N. Hussain
COVID-19 pandemic, despite its devastating impact, accelerated the shift to e-learning in higher education. Particularly in the electrical machines courses, that often include laboratory experiments. However, no detailed models of transformers, developed in Simulink/MATLAB®, were reported in the literature. Hence, in this paper, a virtual laboratory consists of models of single-phase transformers was built for the first time. The proposed models are easy to use and modify, and allow all machines’ parameters to be altered for students to replicate easily to support and enhance the learning process of electrical machines courses. Consequently, the developed models are effective tools for educational and research purposes. Dynamic models of single-phase, two-winding, transformers and step-up and step-down auto-transformers were developed using Simulink/MATLAB®. Two different approaches for modelling were proposed, the block diagram representation and Simscape based models. The two modelling methods were validated against the built-in transformer model. The developed models have been successfully integrated into electrical engineering courses at Middle Technical University, Baghdad, Iraq. Therefore, all developed models are freely available online at a dedicated repository.
Volume: 24
Issue: 1
Page: 37-49
Publish at: 2021-10-01

Enabling seamless communication over several IoT messaging protocols in OpenFlow network

10.12928/telkomnika.v19i5.20412
Fauzi Dwi Setiawan; Universitas Muhammadiyah Malang Sumadi , Agus Eko; Universitas Muhammadiyah Malang Minarno , Lailis; Universitas Muhammadiyah Malang Syafa’ah , Muhammad; Universitas Muhammadiyah Malang Irfan
The most prominent protocols for data transfer in internet of things (IoT) are message queuing telemetry transport (MQTT) and constrained application protocol (CoAP). The existing clients from both sides are unable to communicate directly because of the packet’s header structure difference in application and transport layer. In response, this paper aims to develop a bidirectional conversion server used to translate the specified messaging protocol interchangeably in the OpenFlow network and transmit the converted packet from both sides. The conversion server integrated the MQTT subscriber and CoAP POST object for converting the MQTT message into CoAP data. Similarly, the CoAP-MQTT translation was processed by CoAP GET and MQTT publisher object. The research was evaluated by analysing the round trip time (RTT) value, conversion delay, and power consumption. The RTT value for MQTT-CoAP required 0.5 s while the CoAP-MQTT was accumulated in 0.1 s for single-packet transmission. In addition, the SDN controller and the conversion server only consumed less than 1% central processing unit (CPU) usage during the experiment. The result indicated that the proposed conversion server could handle the translation even though there was an overwhelming request from the clients.
Volume: 19
Issue: 5
Page: 1544-1552
Publish at: 2021-10-01

Intelligent swarm algorithms for optimizing nonlinear sliding mode controller for robot manipulator

10.11591/ijece.v11i5.pp3943-3955
Suhad Qasim G. Haddad , Hanan A. R. Akkar
This work introduces an accurate and fast approach for optimizing the parameters of robot manipulator controller. The approach of sliding mode control (SMC) was proposed as it documented an effective tool for designing robust controllers for complex high-order linear and nonlinear dynamic systems operating under uncertain conditions. In this work Intelligent particle swarm optimization (PSO) and social spider optimization (SSO) were used for obtaining the best values for the parameters of sliding mode control (SMC) to achieve consistency, stability and robustness. Additional design of integral sliding mode control (ISMC) was implemented to the dynamic system to achieve the high control theory of sliding mode controller. For designing particle swarm optimizer (PSO) and social spider optimization (SSO) processes, mean square error performances index was considered. The effectiveness of the proposed system was tested with six degrees of freedom robot manipulator by using (PUMA) robot. The iteration of SSO and PSO algorithms with mean square error and objective function were obtained, with best fitness for (SSO) =4.4876 𝑒-6 and (PSO)=3.4948 𝑒-4.
Volume: 11
Issue: 5
Page: 3943-3955
Publish at: 2021-10-01

Machine learning based outlier detection for medical data

10.11591/ijeecs.v24.i1.pp564-569
R. Vijaya Kumar Reddy , Shaik Subhani , B. Srinivasa Rao , N. Lakshmipathi Anantha
The concept of machine learning generate best results in health care data, it also reduce the work load of health care industry. This algorithm potentially overcome the issues and find out the novel knowledge for development of medical date in health care industry. In this paper propose a new algorithm for finding the outliers using different datasets. Considering that medical data are analytic of mutually health problems and an activity. The proposed algorithm is working based on supervised and unsupervised learning. This algorithm detects the outliers in medical data. The effectiveness of local and global data factor for outlier detection for medical data in real time. Whatever, the model used in this scenario from their training and testing of medical data. The cleaning process based on the complete attributes of dataset of similarity operations. Experiments are conducted in built in various medical datasets. The statistical outcome describe that the machine learning based outlier finding algorithm given that best accurateness.
Volume: 24
Issue: 1
Page: 564-569
Publish at: 2021-10-01

Performance evaluation of campus network involving VLAN and broadband multimedia wireless networks using OPNET modeler

10.12928/telkomnika.v19i5.18531
Dhurgham Abdulridha Jawad; Al-Furat Al-Awsat Technical University Al-Khaffaf , Mohammed G.; University of Babylon Al-Hamiri
Modern technology is essential for all healthy, economic, and educational sectors. Using modern technology involves high-performance networks in terms of quality of service (QoS) parameters such as delay, throughput, bandwidth, and security. A campus network involves wire and the wireless environment with and without virtual local area network (VLAN) technology has been simulated using optimized network engineering tools (OPNET). The simulation model includes four scenarios that involve heavy-loaded File transfer protocol (FTP) and web browsing applications with two logical groups of users. The simulation results show that the VLAN overcome LAN networks in terms of bandwidth and security. This has been done by reducing the throughput in both sending and receiving levels to the confidential servers. The VLAN has also reduced the broadcast domain which results in a high-power efficiency. Moreover, the VLAN network technology has been proved to have lower values of delay in transferring files and packets than LAN network technology. In addition, VLAN technology generally has been decreased values of throughput regardless of the way of connection between servers and workstations. This, in turn, allows taking advantage of wireless connection features in terms of flexibility of installation and speed of configuration.
Volume: 19
Issue: 5
Page: 1490-1497
Publish at: 2021-10-01

Analysis of FAM in satisfaction of inpatient services

10.12928/telkomnika.v19i5.20295
Muhammad Sabir; Universitas Asahan Ramadhan , Nizwardi; Universitas Negeri Padang Jalinus , Refdinal; Universitas Negeri Padang Refdinal , Marsono; STMIK Triguna Dharma Marsono , Yohanni; STMIK Triguna Dharma Syahra , Asyahri Hadi; STMIK Triguna Dharma Nasyuha , Buyung Solihin; Dharmawangsa University Hasugian , Erika Fahmi; STMIK Triguna Dharma Ginting , Masyuni; STMIK Triguna Dharma Hutasuhut
Patients are the main object who must get the best service at a hospital, because the quality of hospital services determines the recovery of a patient and the quality of the hospital. The quality of hospital services has two components, namely the fulfillment of predetermined quality standards and the fulfillment of patient satisfaction. Hospitals must provide services that focus on patient satisfaction. Improving the quality of health services can be started by evaluating each element that plays a role in shaping patient satisfaction. The application of evaluation measures to patient care in each hospital is needed as an increase in the quality of service to patients. The analysis of the fuzzy associate memory method has the closeness of human reasoning to get solutions to various problems so that they are easy to apply and understand. Utilization of decision support system (DSS) analysis with fuzzy associate memory method can be used as an evaluation of the perception of each consumer complaint to measure the level of patient satisfaction.
Volume: 19
Issue: 5
Page: 1529-1534
Publish at: 2021-10-01

Mobile fitness application for beginners

10.11591/ijeecs.v24.i1.pp500-506
Mohamed Imran Mohamed Ariff , Nabil Farhan Roslan , Khairulliza Ahmad Salleh , Masurah Mohamad
The present project is motivated by the recognition that the use of mobile fitness application is increasingly popular among sports and exercise participants in recent years. However, an extensive research on mobile fitness application indicates that most of them are not suitable for beginners. Thus, this project paper describes the development process of a mobile fitness application for beginners, who are looking at enhancing their physical fitness level. This mobile fitness application is developed using android studio and java language. Upon the development of this mobile fitness application, a user testing was conducted and analyzed. The result shows that users were satisfied with the applications as most test scores were above average. Based on these results, the usage of this newly developed mobile fitness application can be suggested to be used by beginner exercisers.
Volume: 24
Issue: 1
Page: 500-506
Publish at: 2021-10-01

Rule-based lip-syncing algorithm for virtual character in voice chatbot

10.12928/telkomnika.v19i5.19824
Felicia Priscilla; Universitas Multimedia Nusantara Lovely , Arya; Universitas Multimedia Nusantara Wicaksana
Virtual characters changed the way we interact with computers. The underlying key for a believable virtual character is accurate synchronization between the visual (lip movements) and the audio (speech) in real-time. This work develops a 3D model for the virtual character and implements the rule-based lip-syncing algorithm for the virtual character's lip movements. We use the Jacob voice chatbot as the platform for the design and implementation of the virtual character. Thus, audio-driven articulation and manual mapping methods are considered suitable for real-time applications such as Jacob. We evaluate the proposed virtual character using hedonic motivation system adoption model (HMSAM) with 70 users. The HMSAM results for the behavioral intention to use is 91.74%, and the immersion is 72.95%. The average score for all aspects of the HMSAM is 85.50%. The rule-based lip-syncing algorithm accurately synchronizes the lip movements with the Jacob voice chatbot's speech in real-time.
Volume: 19
Issue: 5
Page: 1517-1528
Publish at: 2021-10-01

Compact dual-band RF rectifier for wireless energy harvesting using CRLH technique

10.11591/ijeecs.v24.i1.pp338-346
Marwa Jasim Alhily , Nasr Al-Khafaji , Salim Wadi
In this paper, a new dual-band radio frequency (RF) rectifier was designed. The proposed design is a low-profile structure with dimensions of 5×5.5 mm2 owing to the use of lumped elements rather than the conventional transmission lines which occupy large footprints. This property can be potentially exploited to use the proposed rectifier in high dense rectenna arrays to generate high output direct current (DC) voltages. Furthermore, the proposed design adopts the composite right/left-handed composite right left-handed (CRLH) technique to realize the dual-band structure at frequencies of 1.8 and 2.4 GHz. Afterward, the matching circuit was optimized to make sure that it offers good matching. The frequency response shows good matching at both bands which are about -22 and -25 dB respectively. Eventually, the simulated circuit has a conversion efficiency of 52% and output voltages of 0.5 V at -5 dBm for the two bands.
Volume: 24
Issue: 1
Page: 338-346
Publish at: 2021-10-01

Simulation model of PID for DC-DC converter by using MATLAB

10.11591/ijece.v11i5.pp3791-3797
Salam Waley Shneen , Dina Harith Shaker , Fatin Nabeel Abdullah
The change in loads in most applications whose source of nutrition is a renewable energy system. Renewable energy systems can change according to climatic conditions. To control and control these changes, the use of conventional control systems such as PIDs. The PID is one of the most common and used conventional control systems that have been chosen to output the type of power electronic devise (DC-DC converter) in different working conditions. The current study aims to improve the system performance through simulation. Simulation results demonstrate the effectiveness of the system with the controller based on setting parameters such as recording system states, embedded elevation time and transient response.
Volume: 11
Issue: 5
Page: 3791-3797
Publish at: 2021-10-01

A novel design of circularly polarized pentagonal planar antenna for ISM band applications

10.12928/telkomnika.v19i5.19393
F.; Hassan First University of Settat Ouberri , A.; Hassan First University of Settat Tajmouati , J.; University Abdelmalek Essaadi Zbitou , I.; LIMIE laboratory ISGA Casablanca Zahraoui , M.; Microwave Group ESEO Latrach
This paper presents a new circular polarized micro-strip antenna with a pentagonal shape radiator. The proposed antenna is designed to operate in the industrial scientific medical (ISM) band at the frequency of 2.45GHz for Wireless applications. The antenna consists of a radiating pentagon patch with appropriate dimensions on the upper side of a dielectric substrate and a defective ground structure (DGS) on the other side. The pentagon patch is fed through a 50Ω microstrip line. The structure is implemented on an FR-4 substrate with a relative permittivity of 4.4, loss tangent equal to 0.025 and thickness 1.58 mm. The antenna is designed and simulated by using advanced design system (ADS) electromagnetic solver and the achieved results are validated by using another electromagnetic solver. The simulation results indicate that the designed circularly polarized (CP) pentagonal microstrip patch antenna gives good results in terms of the reflection coefficient, voltage standing wave ratio (VSWR) and, axial ratio of 1.025 at 2.45 GHz.
Volume: 19
Issue: 5
Page: 1484-1489
Publish at: 2021-10-01

Classification of heart disease based on PCG signal using CNN

10.12928/telkomnika.v19i5.20486
Aditya Wisnugraha; Universitas Negeri Yogyakarta Sugiyarto , Agus Maman; Universitas Negeri Yogyakarta Abadi , Sumarna; Universitas Negeri Yogyakarta Sumarna
Cardiovascular disease is the leading cause of death in the world, so early detection of heart conditions is very important. Detection related to cardiovascular disease can be conducted through the detection of heart signals interference, one of which is called phonocardiography. This study aims to classify heart disease based on phonocardiogram (PCG) signals using the convolutional neural networks (CNN). The study was initiated with signal preprocessing by cutting and normalizing the signal, followed by a continuous wavelet transformation process using a mother wavelet analytic morlet. The decomposition results are visualized using a scalogram, then the results are used as CNN input. In this study, the PCG signals used were classified into normal, angina pectoris (AP), congestive heart failure (CHF), and hypertensive heart disease (HHD). The total data used, classified into 80 training data and 20 testing data. The obtained model shows the level of accuracy, sensitivity, and diagnostic specificity of 100%, 100%, and 100% for training data, respectively, while the prediction results for testing data indicate the level of accuracy, sensitivity, and specificity of 85%, 80%, and 100%, respectively. This result proved to be better than the mother wavelet or other classifier methods, then the model was deployed into the graphical user interface (GUI).
Volume: 19
Issue: 5
Page: 1697-1706
Publish at: 2021-10-01

Face spoofing detection using surface and sub-surface reflections analysis

10.11591/ijeecs.v24.i1.pp189-197
Azim Zaliha Abd Aziz , Mohd Rizon Mohamed Juhari
Reflection based analysis has been used in previous research for various objectives. Materials classification is one of them. Basically, each material consists of two types of reflections: surface and sub-surface. To separate these two reflections, polarized light could be applied. Previously, multi-reflections characteristics were analyzed using polarized light to classify objects such as between metals and non-metals. However, no trial has been done using the same method to distinguish real and fake faces that could be used to combat spoofing attempts in face biometric system. Since human skin is multi layers structure, it also produces multi reflections. In this paper, driven by the theory, surface and sub-surface reflections of both genuine human face and paper face mask were statistically examined. In addition, iPad displayed face images were also used as spoofing attempts. Images of genuine and spoofing faces were captured using polarized light under two different polarization angles: 0 and 90 degrees. Each angle captured images with surface and sub-surface reflections, accordingly. Those reflections were analyzed based on the mean, standard deviation, skewness and kurtosis. Modality distribution of each image was also studied using another method called the bimodality coefficient (BC). From the results, it is not possible to distinguish between genuine face and printed photos because of the multi reflections’ similarities. However, iPad displayed face images have been successfully identified as spoofing trials.
Volume: 24
Issue: 1
Page: 189-197
Publish at: 2021-10-01

Development of smart parking system using internet of things concept

10.11591/ijeecs.v24.i1.pp611-620
Dwi Puspitasari , Noprianto Noprianto , Muhammad Afif Hendrawan , Rosa Andrie Asmara
The growing number of vehicles in developing countries causes a slew of issues, including the parking system.The current parking system is mostly manual, requires human intervention as a security system, and does not provide information about available parking areas.Their problems cause nonoptimal parking management. Furthermore, it can lead to income loss and criminal acts. This study addresses one of the possible solutions by using the internet of things (IoT) concept. The parking system is built by utilizing a smart card, machine-to-machine (M2M) communication, and cloud monitoring. As a result, the smart parking system prototype has been provided. The parking system business process can be done automatically, and it provides a more secure parking security system. The proposed parking system architecture also provides a practical system. The system only took around 1 second to perform the data transmission between nodes.
Volume: 24
Issue: 1
Page: 611-620
Publish at: 2021-10-01

Visible light communication using new Flip-FBMC modulation system technique

10.12928/telkomnika.v19i5.18407
Abdullah Ali; University Tun Hussein Onn Malaysia Qasim , Husam Noman Mohammed; Al-Furat Al-Awsat Technical University Ali , Ali Kadhim; Al-Furat Al-Awsat Technical University Obaid , M. F. L.; University Tun Hussein Onn Malaysia Abdullah , R.; University Tun Hussein Onn Malaysia Talib , M. S. M.; University Tun Hussein Onn Malaysia Gismalla , Wafi A.; University Tun Hussein Onn Malaysia Mabrouk
Filter bank multi-carrier (FBMC) modulation in the visible light communication (VLC) system is one of the most promising modulation systems in optical wireless communications (OWC), especially in 5G and 6G future applications. FBMC has a wide bandwidth compared to other modulation systems. One of the highest degree essential conditions for utilising the signal in VLC is that the signal is real positive, the signal is agreeable with intensity modulation/direct detection (IM/DD), where Hermitian symmetry (H.S) is utilised to get a real signal (RE) and to be unipolar direct current (DC)-bias is used. Here the challenge arises as this method increases complicating, due to the modulation of the N number of frequency symbols, these symbols need 2N inverse fast fourier transform (IFFT) and fast fourier transform (FFT), in addition to energy consumption. This research focused on the time domain and not the frequency domain by using the traditional complex FBMC generation signal, and to obtain the RE signal by placing the RE signal side by side with the imaginary signal (IMs) in a row, and then using new Flip-FBMC technology, which saves more energy. The proposed technologies provide approximately 57% of the number of IFFT/FFT. The use of Flip-FBMC technology consumes less energy than traditional technologies with better bit error rate (BER) performance.
Volume: 19
Issue: 5
Page: 1439-1449
Publish at: 2021-10-01
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