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  Subjects -> ELECTRONICS (Total: 184 journals)
Showing 1 - 200 of 277 Journals sorted alphabetically
Acta Electronica Malaysia     Open Access  
Advances in Biosensors and Bioelectronics     Open Access   (Followers: 7)
Advances in Electrical and Electronic Engineering     Open Access   (Followers: 6)
Advances in Electronics     Open Access   (Followers: 79)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 8)
Advances in Microelectronic Engineering     Open Access   (Followers: 13)
Advances in Power Electronics     Open Access   (Followers: 33)
Advancing Microelectronics     Hybrid Journal  
Aerospace and Electronic Systems, IEEE Transactions on     Hybrid Journal   (Followers: 318)
American Journal of Electrical and Electronic Engineering     Open Access   (Followers: 24)
Annals of Telecommunications     Hybrid Journal   (Followers: 9)
APSIPA Transactions on Signal and Information Processing     Open Access   (Followers: 9)
Archives of Electrical Engineering     Open Access   (Followers: 13)
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (Followers: 8)
Bell Labs Technical Journal     Hybrid Journal   (Followers: 28)
Bioelectronics in Medicine     Hybrid Journal  
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 19)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 36)
Biomedical Instrumentation & Technology     Hybrid Journal   (Followers: 6)
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 12)
BULLETIN of National Technical University of Ukraine. Series RADIOTECHNIQUE. RADIOAPPARATUS BUILDING     Open Access   (Followers: 1)
Bulletin of the Polish Academy of Sciences : Technical Sciences     Open Access   (Followers: 1)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 47)
China Communications     Full-text available via subscription   (Followers: 8)
Chinese Journal of Electronics     Hybrid Journal  
Circuits and Systems     Open Access   (Followers: 15)
Consumer Electronics Times     Open Access   (Followers: 5)
Control Systems     Hybrid Journal   (Followers: 267)
Edu Elektrika Journal     Open Access   (Followers: 1)
Electrica     Open Access  
Electronic Design     Partially Free   (Followers: 106)
Electronic Markets     Hybrid Journal   (Followers: 7)
Electronic Materials Letters     Hybrid Journal   (Followers: 4)
Electronics     Open Access   (Followers: 86)
Electronics and Communications in Japan     Hybrid Journal   (Followers: 10)
Electronics For You     Partially Free   (Followers: 93)
Electronics Letters     Hybrid Journal   (Followers: 26)
Elkha : Jurnal Teknik Elektro     Open Access  
Embedded Systems Letters, IEEE     Hybrid Journal   (Followers: 51)
Energy Harvesting and Systems     Hybrid Journal   (Followers: 4)
Energy Storage Materials     Full-text available via subscription   (Followers: 3)
EPJ Quantum Technology     Open Access  
EURASIP Journal on Embedded Systems     Open Access   (Followers: 11)
Facta Universitatis, Series : Electronics and Energetics     Open Access  
Foundations and Trends® in Communications and Information Theory     Full-text available via subscription   (Followers: 6)
Foundations and Trends® in Signal Processing     Full-text available via subscription   (Followers: 10)
Frequenz     Hybrid Journal   (Followers: 1)
Frontiers of Optoelectronics     Hybrid Journal   (Followers: 1)
Geoscience and Remote Sensing, IEEE Transactions on     Hybrid Journal   (Followers: 195)
Haptics, IEEE Transactions on     Hybrid Journal   (Followers: 4)
IACR Transactions on Symmetric Cryptology     Open Access  
IEEE Antennas and Propagation Magazine     Hybrid Journal   (Followers: 97)
IEEE Antennas and Wireless Propagation Letters     Hybrid Journal   (Followers: 77)
IEEE Journal of Emerging and Selected Topics in Power Electronics     Hybrid Journal   (Followers: 46)
IEEE Journal of the Electron Devices Society     Open Access   (Followers: 9)
IEEE Journal on Exploratory Solid-State Computational Devices and Circuits     Hybrid Journal   (Followers: 1)
IEEE Power Electronics Magazine     Full-text available via subscription   (Followers: 67)
IEEE Transactions on Antennas and Propagation     Full-text available via subscription   (Followers: 70)
IEEE Transactions on Automatic Control     Hybrid Journal   (Followers: 56)
IEEE Transactions on Circuits and Systems for Video Technology     Hybrid Journal   (Followers: 20)
IEEE Transactions on Consumer Electronics     Hybrid Journal   (Followers: 40)
IEEE Transactions on Electron Devices     Hybrid Journal   (Followers: 19)
IEEE Transactions on Information Theory     Hybrid Journal   (Followers: 26)
IEEE Transactions on Power Electronics     Hybrid Journal   (Followers: 70)
IEEE Transactions on Signal and Information Processing over Networks     Full-text available via subscription   (Followers: 12)
IEICE - Transactions on Electronics     Full-text available via subscription   (Followers: 12)
IEICE - Transactions on Information and Systems     Full-text available via subscription   (Followers: 5)
IET Cyber-Physical Systems : Theory & Applications     Open Access   (Followers: 1)
IET Microwaves, Antennas & Propagation     Hybrid Journal   (Followers: 35)
IET Nanodielectrics     Open Access  
IET Power Electronics     Hybrid Journal   (Followers: 46)
IET Smart Grid     Open Access  
IET Wireless Sensor Systems     Hybrid Journal   (Followers: 18)
IETE Journal of Education     Open Access   (Followers: 4)
IETE Journal of Research     Open Access   (Followers: 11)
IETE Technical Review     Open Access   (Followers: 13)
IJEIS (Indonesian Journal of Electronics and Instrumentation Systems)     Open Access   (Followers: 3)
Industrial Electronics, IEEE Transactions on     Hybrid Journal   (Followers: 58)
Industry Applications, IEEE Transactions on     Hybrid Journal   (Followers: 25)
Informatik-Spektrum     Hybrid Journal   (Followers: 2)
Instabilities in Silicon Devices     Full-text available via subscription   (Followers: 1)
Intelligent Transportation Systems Magazine, IEEE     Full-text available via subscription   (Followers: 13)
International Journal of Advanced Research in Computer Science and Electronics Engineering     Open Access   (Followers: 18)
International Journal of Advances in Telecommunications, Electrotechnics, Signals and Systems     Open Access   (Followers: 10)
International Journal of Antennas and Propagation     Open Access   (Followers: 11)
International Journal of Applied Electronics in Physics & Robotics     Open Access   (Followers: 4)
International Journal of Computational Vision and Robotics     Hybrid Journal   (Followers: 6)
International Journal of Control     Hybrid Journal   (Followers: 11)
International Journal of Electronics     Hybrid Journal   (Followers: 7)
International Journal of Electronics and Telecommunications     Open Access   (Followers: 13)
International Journal of Granular Computing, Rough Sets and Intelligent Systems     Hybrid Journal   (Followers: 2)
International Journal of High Speed Electronics and Systems     Hybrid Journal  
International Journal of Hybrid Intelligence     Hybrid Journal  
International Journal of Image, Graphics and Signal Processing     Open Access   (Followers: 14)
International Journal of Microwave and Wireless Technologies     Hybrid Journal   (Followers: 8)
International Journal of Nano Devices, Sensors and Systems     Open Access   (Followers: 12)
International Journal of Nanoscience     Hybrid Journal   (Followers: 1)
International Journal of Numerical Modelling: Electronic Networks, Devices and Fields     Hybrid Journal   (Followers: 4)
International Journal of Power Electronics     Hybrid Journal   (Followers: 24)
International Journal of Review in Electronics & Communication Engineering     Open Access   (Followers: 4)
International Journal of Sensors, Wireless Communications and Control     Hybrid Journal   (Followers: 10)
International Journal of Systems, Control and Communications     Hybrid Journal   (Followers: 4)
International Journal of Wireless and Microwave Technologies     Open Access   (Followers: 6)
International Transaction of Electrical and Computer Engineers System     Open Access   (Followers: 2)
JAREE (Journal on Advanced Research in Electrical Engineering)     Open Access  
Journal of Biosensors & Bioelectronics     Open Access   (Followers: 3)
Journal of Advanced Dielectrics     Open Access   (Followers: 1)
Journal of Artificial Intelligence     Open Access   (Followers: 10)
Journal of Circuits, Systems, and Computers     Hybrid Journal   (Followers: 4)
Journal of Computational Intelligence and Electronic Systems     Full-text available via subscription   (Followers: 1)
Journal of Electrical and Electronics Engineering Research     Open Access   (Followers: 25)
Journal of Electrical Bioimpedance     Open Access  
Journal of Electrical Bioimpedance     Open Access   (Followers: 2)
Journal of Electrical Engineering & Electronic Technology     Hybrid Journal   (Followers: 7)
Journal of Electrical, Electronics and Informatics     Open Access  
Journal of Electromagnetic Analysis and Applications     Open Access   (Followers: 7)
Journal of Electromagnetic Waves and Applications     Hybrid Journal   (Followers: 8)
Journal of Electronic Design Technology     Full-text available via subscription   (Followers: 6)
Journal of Electronics (China)     Hybrid Journal   (Followers: 4)
Journal of Energy Storage     Full-text available via subscription   (Followers: 4)
Journal of Engineered Fibers and Fabrics     Open Access   (Followers: 2)
Journal of Field Robotics     Hybrid Journal   (Followers: 3)
Journal of Guidance, Control, and Dynamics     Hybrid Journal   (Followers: 169)
Journal of Information and Telecommunication     Open Access   (Followers: 1)
Journal of Intelligent Procedures in Electrical Technology     Open Access   (Followers: 3)
Journal of Low Power Electronics     Full-text available via subscription   (Followers: 7)
Journal of Low Power Electronics and Applications     Open Access   (Followers: 9)
Journal of Microelectronics and Electronic Packaging     Hybrid Journal  
Journal of Microwave Power and Electromagnetic Energy     Hybrid Journal  
Journal of Microwaves, Optoelectronics and Electromagnetic Applications     Open Access   (Followers: 10)
Journal of Nuclear Cardiology     Hybrid Journal  
Journal of Optoelectronics Engineering     Open Access   (Followers: 4)
Journal of Physics B: Atomic, Molecular and Optical Physics     Hybrid Journal   (Followers: 29)
Journal of Power Electronics & Power Systems     Full-text available via subscription   (Followers: 11)
Journal of Semiconductors     Full-text available via subscription   (Followers: 5)
Journal of Sensors     Open Access   (Followers: 26)
Journal of Signal and Information Processing     Open Access   (Followers: 9)
Jurnal ELTIKOM : Jurnal Teknik Elektro, Teknologi Informasi dan Komputer     Open Access  
Jurnal Rekayasa Elektrika     Open Access  
Jurnal Teknik Elektro     Open Access  
Jurnal Teknologi Elektro     Open Access  
Kinetik : Game Technology, Information System, Computer Network, Computing, Electronics, and Control     Open Access  
Learning Technologies, IEEE Transactions on     Hybrid Journal   (Followers: 12)
Magnetics Letters, IEEE     Hybrid Journal   (Followers: 7)
Majalah Ilmiah Teknologi Elektro : Journal of Electrical Technology     Open Access   (Followers: 2)
Metrology and Measurement Systems     Open Access   (Followers: 5)
Microelectronics and Solid State Electronics     Open Access   (Followers: 19)
Nanotechnology Magazine, IEEE     Full-text available via subscription   (Followers: 33)
Nanotechnology, Science and Applications     Open Access   (Followers: 6)
Nature Electronics     Hybrid Journal  
Networks: an International Journal     Hybrid Journal   (Followers: 5)
Open Electrical & Electronic Engineering Journal     Open Access  
Open Journal of Antennas and Propagation     Open Access   (Followers: 8)
Optical Communications and Networking, IEEE/OSA Journal of     Full-text available via subscription   (Followers: 15)
Paladyn. Journal of Behavioral Robotics     Open Access   (Followers: 1)
Power Electronics and Drives     Open Access   (Followers: 1)
Problemy Peredachi Informatsii     Full-text available via subscription  
Progress in Quantum Electronics     Full-text available via subscription   (Followers: 7)
Pulse     Full-text available via subscription   (Followers: 5)
Radiophysics and Quantum Electronics     Hybrid Journal   (Followers: 2)
Recent Advances in Communications and Networking Technology     Hybrid Journal   (Followers: 3)
Recent Advances in Electrical & Electronic Engineering     Hybrid Journal   (Followers: 9)
Research & Reviews : Journal of Embedded System & Applications     Full-text available via subscription   (Followers: 5)
Revue Méditerranéenne des Télécommunications     Open Access  
Security and Communication Networks     Hybrid Journal   (Followers: 2)
Selected Topics in Applied Earth Observations and Remote Sensing, IEEE Journal of     Hybrid Journal   (Followers: 54)
Semiconductors and Semimetals     Full-text available via subscription   (Followers: 1)
Sensing and Imaging : An International Journal     Hybrid Journal   (Followers: 2)
Services Computing, IEEE Transactions on     Hybrid Journal   (Followers: 4)
Software Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 75)
Solid-State Circuits Magazine, IEEE     Hybrid Journal   (Followers: 13)
Solid-State Electronics     Hybrid Journal   (Followers: 9)
Superconductor Science and Technology     Hybrid Journal   (Followers: 2)
Synthesis Lectures on Power Electronics     Full-text available via subscription   (Followers: 3)
Technical Report Electronics and Computer Engineering     Open Access  
TELE     Open Access  
Telematique     Open Access  
TELKOMNIKA (Telecommunication, Computing, Electronics and Control)     Open Access   (Followers: 9)
Universal Journal of Electrical and Electronic Engineering     Open Access   (Followers: 6)
Visión Electrónica : algo más que un estado sólido     Open Access   (Followers: 1)
Wireless and Mobile Technologies     Open Access   (Followers: 6)
Wireless Power Transfer     Full-text available via subscription   (Followers: 4)
Women in Engineering Magazine, IEEE     Full-text available via subscription   (Followers: 11)
Електротехніка і Електромеханіка     Open Access  

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TELKOMNIKA (Telecommunication, Computing, Electronics and Control)
Journal Prestige (SJR): 0.265
Citation Impact (citeScore): 1
Number of Followers: 9  

  This is an Open Access Journal Open Access journal
ISSN (Print) 1693-6930 - ISSN (Online) 2302-9293
Published by Universitas Ahmad Dahlan Homepage  [18 journals]
  • UWB antenna with circular patch for earley breast cancer detection

    • Authors: Aziz El Fatimi, Seddik Bri, Adil Saadi
      Abstract: Breast cancer is the most common cancer in women. It has the highest incidence rate and the highest mortality rate. In recent years, the incidence of breast cancer has become more and more important, it is becoming the first tumor killer for women around the world. Early diagnosis is the most important parameter for detecting cancerous tissue to prevent serious consequences. In this electronic paper, we present a new design of an ultra-wide-band circular microstrip patch antenna operating in the recommended FCC band ([3.1 GHz - 10.6 GHz]) for the detection of breast tumors. The antenna is printed on an FR4 epoxy substrate with a dielectric permittivity r = 4.4 and loss tangent tan = 0.02. The results obtained are largely satisfying and prove that the proposed antenna is a candidate for biomedical applications.
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.12757
      Issue No: Vol. 17, No. 5 (2019)
  • A novel compact CPW tunable stop band filter using a new Z-DGS-resonator
           for microwave applications

    • Authors: Elmahjouby Sghir
      Abstract: The paper presents a novel very compact CPW bandstop filter. The designed structure consists of one unit of new Z-DGS resonator, placed on top layer of ground plane between the input and output this structure, which is excited by 50 ohm coplanar line. The designed filter can be used in X-Band applications as the band stop can be shifted to any other desired frequency by tuning the length of the Z-DGS. The proposed  filter topology has as benefits good performances in terms of wide stop-band rejection, low insertion loss, high return loss, simple design and more small size (17.908 × 10 mm2) compared to other previous works those  reported in literature.  The stop-band width is from 3.96GHz to 6.21GHz, exhibits a 22,25 dB rejection bandwidth of  45% with high selectivity characteristic at the center frequency of  5.05 GHz.
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.12193
      Issue No: Vol. 17, No. 5 (2019)
  • A new Leach protocol based on ICH-Leach for adaptive image transferring
           using DWT

    • Authors: Mohamed Taj Bennani, Abdelali Zbakh
      Abstract: Nowadays, the rapid development and the miniaturization of CMOS image sensors in the last years allowed the creation of WMSN (Wireless Multimedia Sensor Network). Therefore, transferring images through the network becomes an important field of research. The main goal is to transmit the data from a sensor node to another to reach finally the Sink node. Thus, routing protocols play an important role in managing and optimizing the node's resources particularly the energy consumption. Therefore, some routing protocols are known by their ability to save energy and extend the lifetime of the network such as Leach protocol and derived variants. However, multimedia content transferring was not a priority for these protocols. In this paper, the main idea is to adapt ICH-Leach [1], for image transferring. This protocol was tested in a previous work and has given good performances against Leach [2], balanced Leach [3] and MLD-Leach [4]. In fact, the Haar wavelet transform is used, in the application layer, to extract the resolution level to be used in image transmission, depending on the rate flow between the sensor node and the sink node. This paper provides statistics concerning the lifetime of the network, the energy consumption and statistics related to receive images using the peak signal-to-noise ratio (PSNR). The Castalia framework is used for simulation, obtained results show the efficiency of the proposed approach by network lifetime extending and more images transmitting with better quality compared to other protocols.
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.12446
      Issue No: Vol. 17, No. 5 (2019)

    • Authors: mrunal pathak
      Abstract: In today’s sensitive environment, for personal authentication, iris recognition is the most attentive technique among the various biometric technologies. One of the key steps in the iris recognition system is the accurate iris segmentation from its surrounding noises including pupil and sclera of a captured eye-image. In our proposed method, initially input image is taken from the database and preprocessed by using bilateral filtering. After the preprocessing of images contour based features such as, brightness, color and texture features are extracted for the effective segmentation of pupil, iris and sclera from the eye images. Then entropy is measured based on the extracted contour based features. This entropy feature is effectively distinguishing the data in the images. Finally, based on the extracted entropy feature, the convolution neural network (CNN) effectively segments the sclera, iris and pupil parts from the images. Here, the CNN is used for the clustering of the data in images based on the entropy value and results the effective sclera, iris and pupil parts segmentations. The proposed results will be analyzed to demonstrate the performance of the proposed segmentation method with existing methods.
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.12551
      Issue No: Vol. 17, No. 5 (2019)
  • Design and Fabrication of Cost-effective Heart-Rate Pulse Monitoring
           Sensor System

    • Authors: Zulkhairi Mohd Yusof, Md Masum Billah, Kushsairy Kadir, Nur Amanina, Nur Hidayah, Haidawati Nasir
      Abstract: A traditional approach of heart rate measurement has always meant that people must go to hospitals to examine the patient disease at Cardiologist and medical officer. Most people have difficult such as no transport and lazy to go to the hospital for the check-ups of their conditions heart rate. This is because, before have a treatment or medical check-up, they should do an appointment. Besides that, demands of works very high nowadays. People busy with their works until forget to do medical check-ups. Additionally, the available portable heart rate monitoring machine is costly to buy for all. In this research, we develop a system which can be accommodate for all while everyone can do their check up at home and do not waste their time by waiting for their turn in the hospital to do the medical check-ups. The prototype is built using low cost electronics components. The prototype can do a self-check-up before seeing a medical practitioner may reduce mortality rate due to the silent killer that is heart attacks. 
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.9926
      Issue No: Vol. 17, No. 5 (2019)

    • Authors: Muhammad Buce Saleh, I Nengah Surati Jaya, Nitya Ade Santi, Dewayany sutrisno, Ita carolita, Zhang Yuxing, wang xuenjun, liu qian
      Abstract: In forestry sector, the remote sensing technology hold a key role on forest inventory and monitoring their changes. This paper describes the algorithm for detecting deforestation and forest degradation using high resolution satellite imageries with knowledge-based approach. The main objective of the study is to develop a practical technique for monitoring deforestation and forest degradation occurred within the mangrove and swamp forest ecosystem.  The SPOT 4, 5 and 6 images acquired in 2007, 2012 and 2014 were transformed into three vegetation indices, i.e., Normalized Difference Vegetation Index (NDVI), Green-Normalized Difference Vegetation index (GNDVI) dan Normalized Green-Red Vegetation index (NRGI).  The study found that deforestation was well detected and identified using the NDVI and GNDVI, however the forest degradation could be well detected using NRGI, better than NDVI and GNDVI.  The study concludes that the strategy for monitoring deforestation, biomass-based forest degradation as well as forest growth could be done by combining the use of NDVI, GNDVI and NRGI respectively.     
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.12585
      Issue No: Vol. 17, No. 5 (2019)
  • Stochastic Fractal Search for Optimal Reactive Power Dispatch Problem

    • Authors: Thang Nguyen, Hai Van Tran, Ly Huu Pham, Nghia Trong Le
      Abstract: The paper presents applications of Stochastic Fractal Search method (SFS) for dealing with optimal reactive power dispatch (ORPD) problem with target of minimizing power loss, voltage deviation and L index. SFS is a meta-heuristic method consisting of three new solution generation, diffusion process, the first and the second update processes. ORPD is a complicated problem considering all constraints in transmission power network such as voltage of loads and generators, active power and reactive power of generators, reactive power of capacitors, apparent power of conductors, and tap of transformers. In the paper, ORPD is implemented on different study cases of IEEE-30 bus system and IEEE-118 bus system with three independent single objectives such as power loss, voltage deviation and L index. Obtained results from SFS method compared to those from other existing methods can indicate that SFS is more promising than most methods regarding optimal solution quality and search speed. However, SFS is less effective than a few methods. Consequently, it is suggested that SFS should be used as an optimization tool for ORPD problem and modifications performed on SFS are encouraged for better results.         
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.10767
      Issue No: Vol. 17, No. 5 (2019)
  • Excellent luminous flux of WLEDs with flat dual-layer remote phosphor

    • Authors: Nguyễn Đoàn Quốc Anh, Phan Xuan Le
      Abstract: This paper focuses on the comparison of the luminous flux of two dual-remote phosphor structures named flat dual-remote phosphor (FDRP) and concave dual-remote phosphor (CDRP). These two configurations have different luminous flux values due to the disparity in scattering properties in white LEDs. However, the researched results showed that FDRP structure is more lucrative than the CDRP structure when it comes to the luminous flux effectiveness. To support the aforementioned idea, this article also presents the influence of the distance between two phosphor layers (d1) and the distance between the phosphor layer with the LED surface (d2) on the optical properties of the FDRP structure. Specifically, the scattering ability and absorption properties of the remote phosphor layer will vary sharply if d1 and d2 are adjusted into different values, which produces an immense impact on the chromatic homogeneity and illumination capability of WLEDs. Therefore, in order to stabilize the correlated color temperature (CCT) of WLEDs at 8500 K when there is a modification on d1 and d2, the concentration of YAG:Ce3+ phosphor also needs to be varied. Accordingly, the scattering process and absorption phenomenon in the remote phosphor layer will bottom out when d1 = d2 = 0,  leading to the worst color quality and luminous flux. 
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.12111
      Issue No: Vol. 17, No. 5 (2019)
  • Stochastic Fractal Search based Method for Economic Load Dispatch

    • Authors: Thang Nguyen, Ly Huu Pham, Luc Pham, Nam Nguyen
      Abstract: This paper presents a nature-inspired meta-heuristic, called a stochastic fractal search based method (SFS) for coping with complex economic load dispatch (ELD) problem. Two SFS methods are introduced in the paper by employing two different random walk generators for diffusion process in which SFS with Gaussian random walk is called SFS-Gauss and SFS with Levy Flight random walk is called SFS-Levy. The performance of the two applied methods is investigated comparing results obtained from three test system. These systems with 6, 10, and 20 units with different objective function forms and different constraints are inspected. Numerical result comparison can confirm that the applied approach has better solution quality and fast convergence time when compared with some recently published standard, modified, and hybrid methods. This elucidates that the two SFS methods are very favorable for solving the ELD problem.
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.12539
      Issue No: Vol. 17, No. 5 (2019)
  • Improving luminous flux and color homogeneity of dual-layer phosphor

    • Authors: Nguyen Doan Quoc Anh, Phan Xuan Le, Hsiao-Yi Lee
      Abstract: Only with the WLEDs structure but in different color temperatures like 5600 K, 6600 K, 7700K of appearance can we clarify the purpose of the study, which is putting a green phosphor layer SrBaSiO4:Eu2+ on the yellow phosphorus layer YAG:Ce3+. After that, we can find the suitable SrBaSiO4:Eu2+ concentration in order that the luminous flux could get the highest value. The results show that SrBaSiO4:Eu2+ brings great benefits to increasing not only optical gain but also color uniformity. Specifically, the greater the SrBaSiO4:Eu2+ concentration, the greater the output of WLEDs because of the development of green light component in WLEDs. However, only if the SrBaSiO4:Eu2+ concentration exceeds the level, can a slight decrease in color rendering index (CRI) occur. This is based on Monte Carlo simulation. In addition, the results of this paper have contributed significantly to the creation of higher-powered WLEDs.
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.11038
      Issue No: Vol. 17, No. 5 (2019)
  • Wireless Power Transfer using the Concept of Magnetic Coil Resonant System

    • Authors: M. Fitra, Elvy Elvy
      Abstract: Long life lithium ion batteries and methanol fuel cells have been persuaded as ways to make the electrical components more mobile, consumers expectations are still far from being met due to the added weight and expenses for battery replacement. The discovery of wireless power transfer as a new option, and holds great promise to leave the oversized battery. The design of wireless power transfer applies the concept of Magnetic Coil Resonant System (MCRS). The concept of MCRS is similar with a function of an antenna to transfer the power from one point to another. Multisim13.0 software is applied to predict the performance of the proposed MCRS. This software simulation is useful to estimate the output wave on the virtual oscilloscope and to obtain the reading of output voltage from the virtual multimeter. The transmitter side contains power supply, transmitter oscillator circuit and transmitter magnetic coil. Transmitter circuit convert DC to AC waveform and the receiver circuit convert AC to DC voltage. The DC Source that connected to Transmitter was provided by the DC source regulator acts as DC source to adjust Voltage and Current separately. The project show the efficiency of the wireless power transfer with different coil diameter and a distance between the transmitter and receiver coil. At a distance of 15 cm, power are successfully transmitted as it is indicated by the LED light to turn on. The increment of size in coil diameter has given a higher power and longer coverage distance for wireless transfer power.
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.8640
      Issue No: Vol. 17, No. 5 (2019)
  • Effect of Red Y2O3:Eu3+ Phosphor on the Color Quality and Luminous
           Efficacy of the 7000K IPW-LEDs

    • Authors: Le Anh Vu, Minh Tran, Van-Duc Phan, Hoang-Nam Nguyen, Tran Thanh Trang
      Abstract: In this study, we investigate the effect of concentration of the red Y2O3:Eu3+ phosphor on the Color Rendering Index (CRI), Color Quality Scale (CQS) and Lumen Output (LO) of the 7000K in-cup packaging white LEDs (IPW-LEDs). The physical model of the 7000K IPW-LEDs is conducted by Light Tools software. By varying the concentration of the red phosphor from 0% to 0.36%, we use the Light Tools software to investigate the CRI, CQS, and LO of the 7000K IPW-LEDs. From the research results, it can be observed that the CRI and CQS can be increased to 85 and 71, respectively. However, the LO has a decrease in the increasing trend of the red phosphor concentration. This paper provides the new recommendation for the manufacturing of the IPW-LEDs.
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.11391
      Issue No: Vol. 17, No. 5 (2019)
  • Design and Implementation of Smart Electronic Solar Tracker Based on

    • Authors: Rashid Ali Fayadh
      Abstract: Demand of energy increases in the global and exponential exhaustion is favored of resources by fossil fuel for electricity production with the new systems development. Compared with all other remainder energies, the specialist sun energy is the most bountiful energy and it's typically easy to be changed into electrical energy. The main thing of using solar panel is to produce electrical energy from sun's energy but the optimum energy can be generated by tracking solar panel due to the sun movement from east to west. The problem can be solved by proposed systems where the sun tracking by solar panel that based on high intensity of sun ray.  This paper concentrates on tracking the sun by using stepper motor coupled with solar panel. So that, the largest quantity of sun light at the incident panel along the day at any time is better than that for method of fixed panel array which is less efficient. The microcontroller Arduino (mode UNO) was programmed by using C++ language while the track of sun light processing was implemented by using light depending resistor (LDR), Chip IC H-bridge and microcontroller Arduino (UNO) circuits have been designed by using Proteus software. By circuit design and sun tracking control process, the cost reduction has been improved and high amount of energy was saved when implemented this system. 
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.10912
      Issue No: Vol. 17, No. 5 (2019)
  • Power Consumption Analysis on an IoT Network based on Wemos: A Case Study

    • Authors: V. Kanakaris, G. A. Papakostas, D. V. Bandekas
      Abstract: A well-prepared abstract enables the reader to identify the basic content of a document quickly a In this article an Internet of Things (IoT) system is presented, an advanced solution of monitoring the temperature and luminosity at different locations in a data centre of MQTT Server, measuring power consumption in 2 types of time of capturing data (every 0,5 min and every 1 min) making temperature and luminosity data visible over internet through cloud based dashboard. This helps the datacenter management team to take immediate action to rectify the data deviation as well as to know the active life of the IoT system. Also, this can be monitored from anywhere and anytime over online dashboard by the senior level professionals who are not present in the data centre at any point in time. This Wireless Sensor Network (WSN) based
      monitoring system consists of temperature and luminosity sensors, two Wemos boards and one NodeMCU board based on ESP8266 and a Wi-Fi router. ESP8266 is a low power, highly integrated Wi-Fi solution from Espressif. The two Wemos are connected to WiFi router through the NodeMCU, which act as a WiFi repeater here. 
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.11317
      Issue No: Vol. 17, No. 5 (2019)
  • A Low Cost Electromagnetic Wave Sensor for Cracking and Hole Monitoring
           Metal Sheet Material

    • Authors: Galang P Hakim
      Abstract: A crack or a hole in metal sheet could be fatal for vehicle or others that use metal sheet for its body. Therefore to make metal sheet free from crack or hole an inspection using sensor is must. In this paper we proposed a new sensor using radio wave propagation to check whether a metal sheet has a cracks or hole. Our method was use RSSI to check the electromagnetic wave propagation signal strength. We design a low cost electromagnetic wave based sensor with just $37.8 dollar compare to RFID. We success to detect a hole or cracks at metal plate with 1mm thickness and hole  diameter at 8mm, we sent 20 dBm signal strength , we receive at average -27.53 dBm for iron plate and -23.13 dBm for aluminum plate.
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.12684
      Issue No: Vol. 17, No. 5 (2019)
  • H-infinity controller with graphical LMI region profile for Liquid Slosh

    • Authors: Mohd Zaidi Mohd Tumari, A Shamsul Rahimi A Subki, Mohd Shahrieel Aras, Mohammad 'Afif Kasno, Mohd Ashraf Ahmad, Mohd Helmi Suid
      Abstract: This paper presents a H-infinity synthesis with pole clustering based on LMI region schemes for liquid slosh control. Using LMI approach, the regional pole placement known as LMI region combined with design objective in H-infinity controller guarantee a fast input tracking capability and very minimal liquid slosh. A graphical profile of the transient response of liquid slosh suppression system with respect to pole placement is very useful in giving more flexibility to the researcher in choosing a specific LMI region. With the purpose to confirm the design of control scheme, a liquid slosh model is considered to represent the lateral slosh movement. Supremacy of the proposed approach is shown by comparing the results with hybrid model-free fuzzy-PID controller with derivative filter. The performance of the control schemes is examined in terms of time response specifications of lateral tank tracking capability and level of liquid slosh reduction
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.11252
      Issue No: Vol. 17, No. 5 (2019)
  • Proposing a New Method of Image Classification Based on the AdaBoost Deep
           Belief Network Hybrid Method

    • Authors: jamshid bagherzadeh, hasan asil
      Abstract: The hybrid methods were developed to improve the results of the single-component methods. On the other hand, a deep belief network (DBN)is a generative probabilistic modelwith multiple layers of latent variables and is used to solve the unlabeled problems. In fact, this method is anunsupervised method, in which all layers are one-way directed layers except for the last layer. So far, various methods have been proposed for image classification, and the goal of this research project was to use a combination of the AdaBoost method and the deep belief network method to classify images. The other objective was to obtain better results than the previous results. In this project, a combination of the deep belief network and AdaBoost method was used to boost learning and the network potential was enhanced by making the entire network recursive. This method was tested on the MINIST dataset and the results were indicative of a decrease in the error rate with the proposed method as compared to the AdaBoost and deep belief network methods.
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.11797
      Issue No: Vol. 17, No. 5 (2019)
  • Advertisement Billboard Detection and Geotagging System with Inductive
           Transfer Learning in Deep Convolutional Neural Network

    • Authors: Romi Fadillah Rahmat
      Abstract: In this paper, we propose an approach to detect and geotag advertisement billboard in real-time condition. Our approach is using AlexNet’s Deep Convolutional Neural Network (DCNN) as a pre-trained neural network with 1000 categories for image classification. To improve the performance of the pre-trained neural network, we retrain the network by adding more advertisement billboard images using inductive transfer learning approach. Then, we fine-tuned the output layer into advertisement billboard related categories. Furthermore, the detected advertisement billboard images will be geotagged by inserting Exif metadata into the image file. Experimental results show that the approach achieves 92.7% training accuracy for advertisement billboard detection. In addition, the advertisement billboard geotagging achieves a good performance under 4G networks.
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.11276
      Issue No: Vol. 17, No. 5 (2019)

    • Authors: munef A ahmed
      Abstract: In recent years, working on text classification and analysis of Arabic texts using machine learning has seen some progress, but most of this research has not focused on Arabic poetry. Because of some difficulties in the analysis of Arabic poetry, it was required the use of standard Arabic language on which “Al Arud”, the science of studying poetry is based. This paper presents an approach that uses machine learning for the classification of modern Arabic poetry into four types: love poems, Islamic poems, social poems, and political poems. Each of these species usually has features that indicate the class of the poem. Despite the challenges generated by the difficulty of the rules of the Arabic language on which this classification depends, we proposed a new automatic way of modern Arabic poems classification to solve these issues. The recommended method is suitable for the above-mentioned classes of poems. This study used Naïve Bayes, Support Vector Machines, and Linear Support Vector for the classification processes. Data preprocessing was an important step of the approach in this paper, as it increased the accuracy of the classification. 
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.12646
      Issue No: Vol. 17, No. 5 (2019)
  • A Wireless Precoding Technique for Millimetre-Wave MIMO System based on

    • Authors: Rounakul Islam Boby, Khaizuran Abdullah, A.Z. Jusoh, Nagma Parveen, A.L. Asnawi
      Abstract: A communication method is proposed using Minimum Mean Square Error (MMSE) precoding and Successive Interference Cancellation (SIC) technique for millimetre-wave multiple-input multiple-output (mm-Wave MIMO) based wireless communication system. The mm-Wave MIMO technology for wireless communication system is the base potential technology for its high data transfer rate followed by data instruction and low power consumption compared to Long-Term Evolution (LTE). The mm-Wave system is already available in indoor hotspot and Wi-Fi backhaul for its high bandwidth availability and potential lead to rate of numerous Gbps/user. But, in mobile wireless communication system this technique is lagging because the channel faces relative orthogonal coordination and multiple node detection problem while rapid movement of nodes (transmitter and receiver) occur. To improve the conventional mm-wave MIMO nodal detection and coordination performance, the system processes data using symbolized error vector technique for linearization. Then the MMSE precoding detection technique improves the link strength by constantly fitting the channel coefficients based on number of independent service antennas (M), Signal to Noise Ratio (SNR), Channel Matrix (CM) and mean square errors (MSE). To maintain sequentially encoded user data connectivity and to overcome data loss, SIC method is used in combination with MMSE. MATLAB was used to validate the proposed system performance.
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.12802
      Issue No: Vol. 17, No. 5 (2019)
  • IoT-based Intelligent Irrigation Management and Monitoring System using

    • Authors: Fidaus Kamaruddin, Nik Noordini Nik Abd Malik, Noor Asniza Murad, Nurul Mu’azzah Abdul Latiff, Sharifah Kamilah Syed Yusof, Shipun Anuar Hamzah
      Abstract: Plants, flowers and crops are living things around us that makes our earth more productive and beautiful. In order to growth healthy, they need water, light and nutrition from the soil in order to effect cleaning air naturally and produce oxygen to the world. Therefore, a technology that manage to brilliantly control plants watering rate according to its soil moisture and user requirement is proposed in this paper. The developed system included an Internet of Things (IoT) in Wireless Sensor Network (WSN) environment where it manages and monitors the irrigation system either manually or automatically, depending on the user requirement. This proposed system applied Arduino technology and NRF24L01 as the microprocessor and transceiver for the communication channel, respectively. Smart agriculture and smart lifestyle can be developed by implementing this technology for the future work. It will save the budget for hiring employees and prevent from water wastage in daily necessities.
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.12818
      Issue No: Vol. 17, No. 5 (2019)
  • A Novel Autonomous Wireless Sensor Node for IoT Applications

    • Authors: Ngan Nguyen, Quoc Cuong Nguyen, Minh Thuy Le
      Abstract: A novel wireless sensor network node (WSNN) is presented in this paper where the solar energy harvester system is used as an autonomous power solution for endless battery lifetime. In this sensor node, the meander-line Inverted-F-Antenna (MIFA) is proposed and integrated in a single -CC2650 chip of Texas Instrument. The simple structure, low cost, compact size, high efficiency and low power consumption are advantages of this single-chip WSNN. The experimental results show that MIFA antenna is promising solution to enhance communication performance in WSN. In addition, the investigated single-chip WSNN with multi-wireless technologies including Bluetooth Low Energy and Zigbee as well as 6LowPAN is an attractive device for internet of thing (IoT) applications.
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.12811
      Issue No: Vol. 17, No. 5 (2019)
  • Improving Compliance with Bluetooth Device Detection

    • Authors: Martin Davies, Eoghan Furey, Kevin Curran
      Abstract: The number of devices containing Bluetooth chipsets is continuing to rise and there exists a need to stem the tidal wave of vulnerabilities brought by the Bring Your Own Device (BYOD) and Internet of Things
      (IoT) phenomena. With Bluetooth enabled but discovery mode turned off, auditing for Bluetooth devices, or creating an accurate Bluetooth device hardware log is limited. The software tools and hardware
      devices to monitor WiFi networking signals have long been a part of the security auditor’s arsenal, but similar tools for Bluetooth are bespoke, expensive, and not adopted by most security pentesters. However, this has changed with the introduction of the Ubertooth One, a low-cost and open-source platform for monitoring Bluetooth Classic signals. Using a combination of the Ubertooth One, and other high-power Bluetooth devices, an auditor should now be able to actively scan for rogue devices that may otherwise have been missed. This research examines various hardware combinations that can be used to achieve this functionality, and the possible implications from a compliance point of view, with a focus on the standards used by the Payment Card Industry Data Security Standard (PCI-DSS), and the guidelines offered by the National Institute of Standards and Technology (NIST). We compare the results of scanning with traditional Bluetooth devices as opposed to an Ubertooth/Bluetooth combination. We show how the ability to monitor a larger portion of Bluetooth traffic can highlight serious implications in the compliance landscape of many organisations and companies. We demonstrate that identifying non-discoverable devices with Bluetooth enabled is a crucial element in holistic security monitoring of threats.
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.12929
      Issue No: Vol. 17, No. 5 (2019)
  • A Novel Elementary Spatial Expanding Scheme Form on SISR Method with
           Modifying Geman&Mcclure Function

    • Authors: Darun Kesrarat, Kornkamol Thakulsukanant, Vorapoj Patanavijit
      Abstract: Because of the feasible and impressive fallout, the classical Super-Resolution Reconstruction (SRR) is the contemporary algorithm for improving spatial information and reducing noise and SISR (Single-Image Super-Resolution) method, which is form on the classical SRR, is solely developed for improving spatial information. Disastrously, deficiency of the classical SISR method is conceptually computed from three specifications (b, h, k) and the simulating calculation of the optimized specifications for interpolating the better and higher spatial information images with highest PSNR is so burdersome. For figuring out this issue, the Geman&Mcclure function is proposed to replace with the ordinary SISR function because this function is conceptually computed from only one specification (T), contrary to three specifications similar to classical SISR method hence this analytic article focuses to offer a novel elementary spatial expanding scheme form on SISR method with modifying Geman&Mcclure function. Therefore, the fallout of a proposed spatial expanding scheme approximately matches to classical SISR method. From these reason, a novel elementary spatial expanding scheme is easily implemented for real works.
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.12799
      Issue No: Vol. 17, No. 5 (2019)
  • Energy Extraction Method for EEG Channel Selection

    • Authors: Hilman Fauzi, M. Abdullah Azzam, Mohd. Ibrahim Shapiai, Masaki Kyoso, Uswah Khairuddin, Tadayasu Komura
      Abstract: Channel selection is an improvement technique to optimize EEG-based BCI performance. In previous studies, many channel selection methods—mostly based on spatial information of signals—have been introduced. One of these channel selection techniques is the energy calculation method. In this paper, we introduce an energy optimization calculation method, called the energy extraction method. Energy extraction is an extension of the energy calculation method, and is divided into two steps. The first step is energy calculation and the second is energy selection. In the energy calculation step, l2-norm is used to calculate channel energy, while in the energy selection method we propose three techniques: “high value” (HV), “close to mean” (CM), and “automatic”. All proposed framework schemes for energy extraction are applied in two types of datasets. Two classes of datasets i.e. motor movement (hand and foot movement) and motor imagery (imagination of left and right hand movement) were used. The system used a Common Spatial Pattern (CSP) method to extract EEG signal features and k-NN as a classification method to classify the signal features with k = 3. Based on the test results, all schemes for the proposed energy extraction method yielded improved BCI performance of up to 58%. In summary, the energy extraction approach using the CM energy selection method was found to be the best channel selection technique.
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.12805
      Issue No: Vol. 17, No. 5 (2019)
  • Understanding user intention in image retrieval using multiple concept

    • Authors: Abdelmadjid Youcefa, Mohammed Lamine KHERFI, Belal Khaldi, Oussama Aiadi
      Abstract: Image retrieval is the technique that helps Users to find and retrieve desired images from a large image dataset. The user has firstly to formulate a query that expresses his/her needs.  This query may come in textual form as in semantic retrieval, in visual example form as in query by visual example, or as a combination of these two forms named query by semantic example. The focus of this paper lies in the techniques of analysing queries composed of multiple semantic examples. This is a very challenging task, to solve such a problem, we introduce a model based on Bayesian generalization. In cognitive science, Bayesian generalization, which is the base of most works in literature, is a method that tries to find, in one hierarchy of concepts, the parent concept of a given set of concepts. In addition and instead of using one single concept hierarchy, we propose a generalization so it can be used with multiple hierarchies where each one has a different semantic context and contains several abstraction levels. Experimental evaluations demonstrate that our method, which uses multiple hierarchies, yields better results than those using only one single hierarchy. 
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.10202
      Issue No: Vol. 17, No. 5 (2019)
  • Chest Radiograph Image Enhancement with Wavelet Decomposition and
           Morphological Operations

    • Authors: Anthony Y Aidoo, Matilda Wilson, Gloria A. Botchway
      Abstract: Medical image processing algorithms significantly affect the precision of
      disease diagnostic process. This makes it crucial to improve the quality of a medical image with the goal to enhance perceivability of the points of interest in order to obtain accurate diagnosis of a patient.  Despite the reliance of various medical diagnostics on utilize X-rays, they are usually plagued by dark and low contrast properties. Sought-after  details in X-rays can only be accessed by means of digital image processing techniques, despite the fact that these techniques are far from being  perfect. In this paper, we implement a wavelet decomposition and reconstruction technique to enhance radiograph properties, some of which include contrast and noise, by using a series of morphological erosion and dilation to improve the visual quality of the chest radiographs for the detection of cancer nodules.
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.11964
      Issue No: Vol. 17, No. 5 (2019)
  • Risk Simulation of having Direct Contact with Electric Urban Networks

    • Authors: Fernando Martínez Santa, Fredy H. Martínez, Edwar Jacinto
      Abstract: To know the electric risks for the human health having electric discharges on low and medium voltage urban networks, helps to the people to make aware about doing actions of prevention and safety, which reach to prevent injuries and/or accidental deaths. In this paper, simulations on ATP-Draw software over three different specific risk cases were done, based on the concurrent problem presented in the central region of Colombia between august and october when people use to fly kites. The first case analyzed is an individual who has an indirect contact with medium voltage transmission lines by means on a conventional kite, presenting no serious effects on its health. In the second and in the third case, the individual generates a direct contact both low and medium voltage lines, when tries to recover a stuck kite, receiving high health effects even producing death. The main goal of this work is to show the different consequences and effects in the human body which are presented over a person when receiving an electric discharge by direct contact, in order to prevent accidents.
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.12482
      Issue No: Vol. 17, No. 5 (2019)
  • Humidity Effect on Electrical Properties of Graphene Oxide Back-to-Back
           Schottky Diode

    • Authors: Shaharin Fadzli Abd Rahman, Nurul Anati Salleh, Mastura Shafinaz Zainal Abidin, Amirjan Nawabjan
      Abstract: A Schottky diode-based sensor is a promising structure for high sensitive and low power sensor. This paper investigates a device called back-to-back Schottky diode (BBSD) for humidity sensing operation. The BBSD provides simpler device configuration that can be fabricated using less complicated process. The current-voltage characteristic of the fabricated BBSD was measured at different relative humidity. From the obtained characteristics, series resistance, barrier height and ideality factor was analyzed. The device current increased at higher humidity level. The current increase could be associated to the decrease in series resistance, barrier height and ideality factor. When humidity decreased from 11 % to 97%, the barrier height showed reduction of 0.1 eV. The barrier height reduction was explained by considering electric field-induced reduction of graphene oxide. The observed result confirmed the device feasibility as promising simple and low cost humidity sensor.
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.12800
      Issue No: Vol. 17, No. 5 (2019)
  • 128mA CMOS LDO with 108db PSRR at 2.4MHz Frequency

    • Authors: Astrie Nurasyeila Fifie, Yan Chiew Wong
      Abstract: A low dropout (LDO) voltage regulator with high power supply rejection ratio (PSRR) and low temperature coefficient (TC) is presented in this paper. Large 1µF off-chip load capacitor is used to achieve the high PSRR. However, this decreases the gain and pushes the LDO’s output pole to lower frequency causing the circuit to become unstable. The proposed LDO uses rail-to-rail folded cascode amplifier to compensate the gain and stability problems. 2nd order curvature characteristic is used in bandgap voltage reference circuit that is applied at the input of the amplifier to minimize the TC. The characteristic is achieved by implementing MOSFET transistors operate in weak and strong inversions. The LDO is designed using 0.18µm CMOS technology and achieves a constant 1.8V output voltage for input voltages from 3.2V to 5V and load current up to a 128mA at temperature between -40°C to 125°C. The proposed LDO is targeted for RF application which has stringent requirement on noise rejection over a broad range of frequency.128mA CMOS LDO with 108db PSRR at 2.4MHz Frequency
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.12795
      Issue No: Vol. 17, No. 5 (2019)
  • Optical Fiber Tip Sensor for Glucose-Adulterated Honey Detection

    • Authors: Nazirah Mohd Razali, Aimi Najwa Mazlan, Mohammad Farizuddin Salebi, Habibah Mohamed, Sumiaty Ambran
      Abstract: Honey, a natural sweet substance and also a high-value foodstuff has been a target for adulteration. This paper reports the early stage development of optical fiber tip sensor using a standard single mode fiber for adulterated honey detection. The development of simple, sensitive and low-cost sensor for direct detection of adulterated honey is a considerable interest in this context. A pure stingless bee honey was mixed with glucose adulterant at different volume ratios for the adulteration process. By changing this chemical composition, the refractive index of the adulterated honey varied and Fresnel reflection occured at the interface between the fiber tip and the adulterated honey solution also changed. The average sensitivity achieved by this sensor is 0.29 dBm/% with linear regression value up 0.97. This shows that, the sensor has a potential in adulterated honey detection.
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.12813
      Issue No: Vol. 17, No. 5 (2019)
  • AC Breakdown Behavior of SF6/N2 Gas Mixtures under Non-Uniform Field
           Electrode Configurations

    • Authors: N. F. Ambo, H. Zainuddin, M. S. Kamarudin, J. M. Wari, A. Zahari
      Abstract: Sulphur hexafluoride (SF6) gas owns remarkable properties as insulation medium and current interrupter, which make it being widely used in gas-insulated equipment up to now. However, SF6 gas has a drawback that gives adverse effect to the environment since it is a strong greenhouse gas. As the effort to minimize the SF6 usage, this study was conducted to investigate the AC breakdown behavior of SF6/N2 gas mixtures with 10/90 ratio at low pressure levels (i.e. 0.11 MPa to 0.15 MPa) under non uniform field (i.e. R0.5-plane and R6-plane electrodes configurations). The results of the study indicate that the breakdown voltage of SF6/N2 gas mixtures in non-uniform field increases linearly with the increase of gas pressure and electrodes gap distance. As a function of gap distance, a higher increasing rate of breakdown voltage values were achieved at lowest pressure of 0.11 MPa compared to other pressure levels. In addition, it is also found that a higher breakdown voltage values was obtained under R6-plane configuration. But, the difference in breakdown voltage values between R0.5-plane and R6-plane configuration is less significant as the gap distance is increased. It is also observed that the field efficiency factor of R6-plane is higher than R0.5-plane which indicates a more uniform field exists between the electrodes.
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.12806
      Issue No: Vol. 17, No. 5 (2019)
  • HEVC 2D-DCT Architectures Comparison for FPGA and ASIC Implementations

    • Authors: Ainy Haziyah Awab, Ab Al-Hadi Ab Rahman, Mohd Shahrizal Rusli, Usman Ullah Sheikh, Izam Kamisian, Goh Kam Meng
      Abstract: This paper compares ASIC and FPGA implementations of two commonly used architectures for 2-dimensional discrete cosine transform (DCT), the parallel and folded architectures. The DCT has been designed for sizes 4x4, 8x8, and 16x16, and implemented on Silterra 180nm ASIC and Xilinx Kintex Ultrascale FPGA. The objective is to determine suitable low energy architectures to be used as their characteristics greatly differ in terms of cells usage, placement and routing methods on these platforms. The parallel and folded DCT architectures for all three sizes have been designed using Verilog HDL, including the basic serializer-deserializer input and output. Results show that for large size transform of 16x16, ASIC parallel architecture results in roughly 30% less energy compared to folded architecture. As for FPGAs, folded architecture results in roughly 34% less energy compared to parallel architecture. In terms of overall energy consumption between 180nm ASIC and Xilinx Ultrascale, ASIC implementation results in about 58% less energy compared to the FPGA.
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.12815
      Issue No: Vol. 17, No. 5 (2019)
  • A new two-scroll chaotic system with two nonlinearities: Dynamical
           analysis and circuit simulation

    • Authors: Aceng Sambas, Sundarapandian Vaidyanathan, Sen Zhang, Yicheng Zeng, Mohamad Afendee Mohamed, Mustafa Mamat
      Abstract: This paper reported the finding of a new two-scroll chaotic system possessing two nonlinearities. The dynamical properties of the system such as dissipativity, equilibrium points, Lyapunov exponents, Kaplan-Yorke dimension and bifurcation diagram were studied in detail. The presence of coexisting chaotic attractors, coexisting chaotic and periodic attractors in the system was investigated. In addition, the offset boosting of a variable was achieved by adding a single controlled constant. It was shown that the new chaotic system has rotation symmetry about the z-axis. An electronic circuit simulation of the new two-scroll chaotic system was built using Multisim to check the feasibility of the model.  
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.10650
      Issue No: Vol. 17, No. 5 (2019)
  • Temperature Characterization of (Si-FinFET) based on Channel Oxide

    • Authors: Yasir H. Hashim, Yousif Atalla, Abdul Nasir Abd Ghafar, Waheb Abdul Jabar
      Abstract: This paper presents the temperature-gate oxide thickness characteristics of a fin field-effect transistor (FinFET) and discusses the possibility of using such a transistor as a temperature nano-sensor. The investigation of channel oxide thickness–based temperature characteristics is useful to optimized electrical and temperature characteristics of FinFET. Current–voltage characteristics with different temperatures and gate oxide thickness values (Tox = 1, 2, 3, 4, and 5 nm) are initially simulated, and the diode mode connection is considered to measure FinFET’s temperature sensitivity. Finding the best temperature sensitivity of FinFET is based on the largest change in current (∆I) within a working voltage range of 0–5 V. According to the results, the temperature sensitivity of FinFET increases linearly with oxide thickness within the range of 1–5 nm, furthermore, the threshold voltage and drain-induced barrier lowering increase with increasing oxide thickness. Also, the subthreshold swing (SS) is close to the ideal value at the minimum oxide thickness (1 nm) then increases and diverges with increasing oxide thickness. So, The best oxide thickness (nearest SS value to the ideal one) of FinFET under the conditions described in this research is 1 nm.
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.11798
      Issue No: Vol. 17, No. 5 (2019)
  • Adaptive Control of Nonlinear System based on QFT Application to 3-DOF
           Flight Control System

    • Authors: Rounakul Islam Boby, Khaizuran Abdullah, A.Z. Jusoh, Nagma Parveen, Md Mahmud
      Abstract: Research on unmanned aerial vehicle (UAV) became popular because of remote flight access and cost-effective solution. 3-degree of freedom (3-DOF) unmanned helicopters is one of the popular research UAV, because of its high load carrying capacity with a smaller number of motor and requirement of forethought motor control dynamics. Various control algorithms are investigated and designed for the motion control of the 3DOF helicopter. Three-degree-of-freedom helicopter model configuration presents the same advantages of 3-DOF helicopters along with increased payload capacity, increase stability in hover, manoeuvrability and reduced mechanical complexity. Numerous research institutes have chosen the three-degree-of-freedom as an ideal platform to develop intelligent controllers. In this research paper, we discussed about a hybrid controller that combined with Adaptive and Quantitative Feedback theory (QFT) controller for the 3-DOF helicopter model. Though research on Adaptive and QFT controller are not a new subject, the first successful single Adaptive aircraft flight control systems have been designed for the U.S. Air Force in Wright Laboratories unmanned research vehicle, Lambda [1]. Previously researcher focused on structured uncertainties associated with controller for the flight conditions theoretically. The development of simulationbased design on flight control system response, opened a new dimension for researcher to design physical flight controller for plant parameter uncertainties. At the beginning, our research was to investigates the possibility of developing the QFT combined with Adaptive controller to control a single pitch angle that meets flying quality conditions of automatic flight control. Finally, we successfully designed the hybrid controller that is QFT based adaptive controller for all the three angles.
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.12810
      Issue No: Vol. 17, No. 5 (2019)
  • A New Technique to Reduce Overshoot in Pneumatic Positioning System

    • Authors: Siti Fatimah Sulaiman, M. F. Rahmat, A. A. M. Faudzi, Khairuddin Osman
      Abstract: This paper presents a new approach for improving the performance of the pneumatic positioning system by incorporating a nonlinear gain function with observer system. System identification technique has been employed to represent the pneumatic system, while a model predictive control (MPC) with the observer system has been employed as the main controller to control the positioning of the system. The nonlinear gain function has been incorporated with the control strategy to compensate nonlinearities and uncertainties inherent in the parameters of the system. Unconstrained and constrained cases of control signals have been considered in this study. Simulation based on Matlab/Simulink indicated a reduction in overshoot of the system response for both cases due to additional nonlinear gain function in the strategy. Furthermore, remarkable enhancement was observed in effectiveness of this function while incorporated in constrained case, when this new strategy successfully improved the transient response in the pneumatic positioning system.
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.12807
      Issue No: Vol. 17, No. 5 (2019)
  • Performance Comparison of PEMFC Hydrogen Reformer with Different

    • Authors: Nor Aira Zambri, Norhafiz Bin Salim, Faridah Hanim Mohd Noh, Sim Sy Yi
      Abstract: The renewable energy technology has become very popular due to major constraint in the existing electrical system such as high electricity demand, increased in fuel prices and concern of environmental pollution. The aims of this project are to develop a complete Proton Exchange Membrane Fuel Cell (PEMFC) model with hydrogen reformer by using MATLAB/ Simulink with three different controllers and comparison between the three controllers will be discussed. This project presents the development of methods to solve the problem of PEMFC output voltage by using different controllers which are Proportional Integral (PI), Proportional Integral Derivatives (PID) and Proportional Integral Fuzzy (PI-Fuzzy) controllers. The Ziegler Nicholas tuning method is used to tune PI and PID gains in a Simulink model. It helps the system to achieve a balance between performance and robustness for both controllers. The Mamdani type was used to develop the fuzzy controller in Simulink model. The transient performances that will be discussed are rise time, settling time, maximum overshoot, and percentage of overshoot. The results show that the proposed PI-Fuzzy is better than the conventionally used PI and PID controllers.
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.12817
      Issue No: Vol. 17, No. 5 (2019)
  • Optimization of PID for Industrial Electro-Hydraulic Actuator using PSOGSA

    • Authors: Mohammed Maged Abdullah Alqadasi, Siti Marhainis Othman, M.F. Rahmat, Fahisal Abdullah
      Abstract: The Electro-hydraulic actuator (EHA) systems known to be extremely nonlinear due to its dynamic characteristics and these existing nonlinearities and uncertainties yield to the constraint in the control of EHA system, which influences the position tracking accuracy and affect the occurrences of leakage and friction in the system. The purpose of this work is to develop the mathematical model for the industrial electrohydraulic actuator, then to design a controller by proportional-integral-derivative (PID) and optimize the parameters using Particle Swarm Optimization - Gravitational Search Algorithm (PSOGSA). A few controllers such as conventional PID (CPID) and model reference adaptive control (MRAC) designed for comparison. The performance of PID, PID-PSOGSA and modern controller MRAC will be compared in order to determine the most efficient controller. Despite all controllers are capable to provide good performance, PID-PSOGSA control methods generate good response compared to PID and MRAC in term of positioning.
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.12808
      Issue No: Vol. 17, No. 5 (2019)
  • A Methodology for Precise Estimation of Rain Attenuation on Terrestrial
           Millimetre Wave Links from Raindrop Size Distribution Measurements

    • Authors: Manhal Alhilali, Mustafa Ghanim, Jafri Din, Hong Yin Lam
      First page: 2139
      Abstract: Attenuation by atmospheric rain is the most significant impairment in millimetre wave frequencies (mmWave). Modern instruments could provide detailed measurements of rain, such as raindrop size distributions (DSDs). The analysis of DSDs could estimate their effects on past or co-located links measurements. This study presents propagation analysis in the mmWave bands using measurements of two terrestrial links working at 26 and 38 GHz carried out in Johor, Malaysia. Statistics obtained have been analysed in detail to extract any excess attenuation. The DSDs provided by a disdrometer have been used to estimate rain attenuation. The derived results show that the estimation can provide reasonable accuracy after extracting the wet antenna effects and having the advantage of the availability of measurements from various types of equipment.
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.12798
      Issue No: Vol. 17, No. 5 (2019)
  • Cooperative Underlay Cognitive Radio assisted NOMA: Secondary Network
           Improvement and Outage Performance

    • Authors: Dinh-Thuan Do, Chi-Bao Le, Anh-Tu Le
      First page: 2147
      Abstract: In this paper, a downlink scenario of a non-orthogonal multiple access (NOMA) scheme with power constraint via spectrum sensing is considered. Such network provides improved outage performance and new scheme of NOMA-based cognitive radio (CR-NOMA) network are introduced. The different power allocation factors are examined subject to performance gap among these secondary NOMA users. To evaluate system performance, the exact outage probability expressions of secondary users are derived. Finally, the dissimilar performance problem in term of secondary users is illustrated via simulation, in which a power allocation scheme and the threshold rates are considered as main impacts of varying system performance. The simulation results show that the performance of CR-NOMA network can be improved significantly.
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.12451
      Issue No: Vol. 17, No. 5 (2019)
  • Fractal Yagi-Uda Antenna for WLAN Applications

    • Authors: Amerrul Zabri, M. K. A. Rahim, F. Zubir, N. M. Nadzir, H. A. Majid
      First page: 2155
      Abstract: This paper describes the development of a Fractal printed Yagi-Uda antenna for Wireless Local Area Network (WLAN) applications operating at 2.4 GHz frequency. In miniaturizing the dimensions of an antenna, fractal method is applied where the 1st iteration and 2nd iteration is implemented. The Computer Simulation Technology (CST) software is used as the platform to design and simulate the antenna. The substrate material used is the FR-4 board which has a dielectric constant of 5.4, the thickness of 1.6mm and tangent loss of 0.019. The antenna performance interm of the reflection coefficient, radiation pattern and gain are compared and analyzed. For the 1st iteration, 22.81% of reduction size has been achieved and 30.81% reduction of the antenna size for 2nd iteration has been achieved.
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.12797
      Issue No: Vol. 17, No. 5 (2019)
  • Pilot Reuse Sequences for TDD in Downlink Multi-cells to Improve Data

    • Authors: Adeeb Salh, Lukman Audah, Nor S. M. Shah, Shipun A. Hamzah
      First page: 2161
      Abstract: The exponential growth in demand for high data rate transmission to users in fifth generation wireless networks, focus there has been a particular research focus on new techniques that achievable high data rate by suppressing interference between neighboring cells. In this paper, we propose that system performance can be improved by using perfect channel estimation and reducing effective interference with pilot reuse that mitigate strong pilot contamination based on the knowledge of large-scale fading coefficients. We derived the lower bounds on the achievable data rate in downlink by analyzing the performance of the zero-forcing precoding method and derive the signal-to-interference noise ratio to mitigate interference between neighboring cells. From the simulation results, the large pilot reuse sequences improved the achievable data rate and provided better estimation for a channel. When the number of users is large, the interference between neighboring cells can be suppressed by using orthogonal pilot reuse sequences.
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.12809
      Issue No: Vol. 17, No. 5 (2019)
  • Full-Duplex User-Centric Communication using Non-Orthogonal Multiple

    • Authors: Sock Theng Ooi, Razali Ngah, Marwan Hadri Azmi
      First page: 2169
      Abstract: This paper proposes an improved user-centric Non-Orthogonal Multiple Access (NOMA) communication in two-base station networks with in-band full duplex (IBFD) user. We derive the achievable rates of the proposed user-centric NOMA systems. For benchmarking purposes, we also derive the achievable rate for the user-centric system deploying conventional NOMA schemes, Orthogonal Multiple Access (OMA) schemes and point-point communication systems. We then analyze and simulate the performance of the proposed and all the benchmarked systems. We found that our proposed user-centric NOMA approach has a 64% improvement in the total achievable rate when compared to the benchmarked approach under similar power constraint.
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.12803
      Issue No: Vol. 17, No. 5 (2019)
  • Enhancement of Boresight Radiation for Leaky Wave Antenna Array

    • Authors: Mowafak k. Mohsen
      First page: 2179
      Abstract: An array of half-width microstrip leaky-wave antennas (HW-MLWAs) of two uniform elements was designed to obtain maximum boresight radiation. Achieve this, two uniforms of HW-MLWAs are placed at 180◦ and fed by a probe located at the center between the elements, two uniforms of HW-MLWAs, loaded terminated by 50Ω lumped element. Two beams from two branches individual merge to form the resultant directive beam. The simulation represents the susceptibility of the proposed array of uniform HW-MLWAs to the radiation broadside direction effectively. The predict bandwidth matched of the array is 582 MHz (4.18 – 4.76 GHz). The direction of its main beam in boresight happens over a wide 13%, relatively (4.18 - 4.76 GHz) band. The proposed peak gain at the boresight direction of the array is 9.91 dBi.
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.12631
      Issue No: Vol. 17, No. 5 (2019)
  • A New Configuration of Patch Antenna Array for Rectenna Array Applications

    • Authors: Abdellah Taybi
      First page: 2186
      Abstract: The performance and advantages of microstrip patch antennas made them a field of interest for wireless power transmission applications, especially for rectenna systems where the choice of the antenna is a crucial step.  In this paper, a 5.8 GHz circularly polarized patch antenna has been designed and fabricated, then mounted by using 4 elements to achieve an antenna array to enhance the captured power to be converted by the rectifier circuit. The antenna array is well matched at 5.8 GHz in terms of reflection coefficient and has a directivity of 11dB and a gain of 6 dB. Results have been confirmed by fabrication. 
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.11476
      Issue No: Vol. 17, No. 5 (2019)
  • Raman Amplifier Performance In Pre-Amplifier Use for Optical Fiber
           Communication Systems

    • Authors: Toto Saktioto, Siska Putri Dewi, Romi Fadli Syahputra, Okfalisa Okfalisa, Syamsudhuha Syamsudhuha
      First page: 2194
      Abstract: The development of telecommunications networks is currently dominated by fiber optics. The fiber optic has become a waveguide medium transmitting information with high frequency bands, high capacity and high speed. An optical amplifier is required to maintain electromagnetic signals when they propagate in far distance. One of the amplifiers, Fiber Raman Amplifiers (FRA) which is the light scattering from the light that comes with the phonon in the lattice of amplification medium produces photons that are coherent with the incoming photons. Many amplifiers are commonly used but the problems not only come from the amplifier but also the component circuit and system. By simulation method, FRA circuit is designed and operated in the form of pre-amplifiers to maintain a better signal from material interference and geometry. The simulation results show that the lowest BER value and the highest Q-factor are found at a distance of 10km depicted by eye diagram.
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.12594
      Issue No: Vol. 17, No. 5 (2019)
  • Comparison Study on Secrecy Outage Probability of AF-NOMA and AF-OMA

    • Authors: Dinh-Thuan Do, Minh-Sang Nguyen
      First page: 2200
      Abstract: A new design of non-orthogonal multiple access (NOMA) is considered in this study under secrecy outage probability performance considerations. The Amplify-and-Forward (AF) relaying scheme is applied in this system model. In case of existence of an external eavesdropper, a transmitter sends confidential messages to far users in the presence of an external eavesdropper in concerned NOMA system. To highlight performance of NOMA system model, orthogonal multiple access (OMA) is compared with respect to both secure performance and transmit SNR. In particular, the secrecy outage probability is evaluated as the secrecy metric to limit impacts of the practical passive eavesdropper in real scenario. It is confirmed that the secrecy outage is significant lower than OMA due to related parameters characterization in NOMA, and it should be controlled by varying related coefficients. Finally, we show the both of NOMA and OMA against to impact of eavesdropper in the studied problems in terms of analytically result and numerically result.
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.11111
      Issue No: Vol. 17, No. 5 (2019)
  • Prototype Distributed Application In Banking Transaction Using Remote
           Method Invocation

    • Authors: Agus Cahyo Nugroho
      First page: 2208
      Abstract: Today banks have many branches in big cities of the world. System usually used  a central database in a particular city. Increased of database server performance due to number of users accessing this application should not degrade performance of application. To keep  database server performance optimally, application must distributed to the network. Therefore it is going to used three-tier application, because three-tier applications support deployment of distributed-based applications component. In distributed applications it takes a remote method call, that is why we are going to used Remote Method Invocation to develop this system. Based on results of analysis conducted, author can draw some following conclusion of the application, which are it can be run as a separate process on the same computer or run on a different computer, then once the client get a reference from the remote object then method of remote object is called like calling method from local object and methods that we have defined and implemented on remote object can we call or use both on desktop and web applications so we do not need to work twice.
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.8222
      Issue No: Vol. 17, No. 5 (2019)
  • A Wideband Dielectric Resonator Antenna with a Cross Slot Aperture for 5G

    • Authors: Abinash Gaya, Mohd Haizal Jamaluddin, M.R. Kamarudin, Irfan Ali
      First page: 2218
      Abstract: This paper represents design of a wideband Rectangular Dielectric Resonator antenna fed by an aperture coupled technique. A bandwidth of 2.2 GHz has been achieved using a cross slot aperture in a ground plane for Dielectric Resonator Antenna (DRA). The simulated gain value achieved is 6.5dBi. The Rectangular Dielectric Resonator which has been designed in this paper can be used in 5G application frequency band of 24.25-27.5 GHz. The calculated percentage bandwidth is 15.38 %. An optimization of slot dimensions has also mentioned which can help to select a desired impedance match. The measured gain and bandwidth are efficient to use this design for various 5G applications. This unit cell wideband DRA can be used for higher level frequencies of 5G.
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.12801
      Issue No: Vol. 17, No. 5 (2019)
  • Comparative Analysis of LTE Backbone Transport Techniques for Efficient
           Broadband Penetration in a Heterogeneous Network Morphology

    • Authors: Ifeanyi Maryrose Chinaeke-Ogbuka
      First page: 2226
      Abstract: In the bid to bring about a solution to the nagging problem associated with the provision of ubiquitous broadband access, Next Generation Network (NGN) popularly referred to as Long Term Evolution (LTE) network with appropriate network integration technique is recommended as solution. Currently, Internet Protocol/Multi-Protocol Label Switching (IP/MPLS) is the transport technique in LTE backbone infrastructure. This technique, however, suffers significantly in the event of failure of IP path resulting in delay and packet loss budgets across the network. The resultant effect is degradation in users’ quality of service (QoS) experience with real-time services.  A competitive alternative is the Internet Protocol /Asynchronous Transfer Mode (IP/ATM). This transport technique provides great dynamism in the allocation of bandwidth and supports varying requests of multimedia connections with diverse QoS requirements. This paper, therefore, seeks to evaluate the performance of these two transport techniques in a bid to establish the extent to which the latter technique ameliorates the aforementioned challenges suffered by the previous technique. Results from the simulation show that the IP/ATM transport scheme is superior to the IP/MPLS scheme in terms of average bandwidth utilization, mean traffic drop and mean traffic delay in the ratio of 9.8, 8.7 and 1.0% respectively.
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.10987
      Issue No: Vol. 17, No. 5 (2019)
  • Design of Wideband Rotman Lens for Wireless Applications

    • Authors: Mohammed K. Al-obaidi, Ezri Mohd, Noorsaliza Abdullah, Samsul Dahlan
      First page: 2235
      Abstract: An electrically steerable beam is an essential standard in the recent wireless application in order to increase the gain and reduce the interference.  A wideband beamforming network based on a printed microstrip Rotman lens with a ±26o scanning angle was designed in this study. The designed lens operates at 2.45 GHz with 592 MHz bandwidth. The lens consists of five switchable ports (input ports) with four output ports that connected to the microstrip patch antennas. The five switchable ports were used to realize the scanning beams angle in the azimuth plane.  The proposed model is simulated by CST Microwave Studio and fabricated on FR-4 with 1.565 mm thickness and 4.2 permittivity.  A good agreement between simulation and measurement results were achieved.
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.11930
      Issue No: Vol. 17, No. 5 (2019)
  • Algorithm of optimal technology selection of broadband access network

    • Authors: Svetlana A Sadchikova
      First page: 2244
      Abstract: High speed applications require the access network upgrading based on new optical technologies in “last mile”. At the planning stage of network modernization, special algorithms and techniques allow optimize and automate the designing process of network upgrade based on copper cables. However, these techniques are completely inapplicable if optical technologies are used to the access network modernization. Designed algorithm simplifies the throughput calculation of current access nodes and planning of new access nodes depending on subscriber’s requirementst to the broadband services. Developed program based on proposed algorithm allows to determinate access nodes optimal deployment as well as the required equipment characteristics.
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.12140
      Issue No: Vol. 17, No. 5 (2019)
  • Circular Polarization Folded Reflectarray Antenna for 5G Applications

    • Authors: Mohd Fairus Mohd Yusoff, Lim Jit Min, Mohamad Rijal Hamid, Zaharah Johari, Muhammad Naeem Iqbal
      First page: 2250
      Abstract: Fifth-generation (5G) is a wireless connection built specifically to keep up with the rapid increase of devices that need a mobile internet connection. A system working on 5G band can provide higher bandwidth and faster data rate as compared to fourth-generation (4G) band. Thus, an antenna with higher gain and lower profile is required to support this system. On the other hand, the performance of circular polarization antenna is better than linear polarization antenna due to its ability to accept wave from different direction. In this project, a low profile circular polarization folded reflectarray antenna with operating frequency of 28 GHz is presented. This project is divided into two parts. In the first part, a linear polarization folded reflectarray antenna is designed. In this second part, a meander lines polarizer is used to convert the linear polarization antenna to circular polarization antenna. The antenna is fed by a linear polarized waveguide. Each radiating element of the antenna is in rectangular shape. The size of the radiating elements are selected according to obtain required phase delay to form a planar phase front in the far-field distance. Both of the antennas are simulated by using Computer Simulation Technology (CST) software. Finally, the results shows excellent performances with 16.81dB directivity and 1.49dB axial ratio at 28GHz. Thus, the antenna is very suitable for 5G applications.
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.12812
      Issue No: Vol. 17, No. 5 (2019)
  • Antenna Array Design with Rectangular Ring Slot for 5G Technology

    • Authors: Nur Ilham Aliyaa Ishak, Norhudah Seman, Tien Han Chua
      First page: 2258
      Abstract: A patch antenna with rectangular-shaped ring slot that fed by a coaxial probe is proposed in this article as the single element for planar patch array antenna design to meet the requirement of multiple input multiple output (MIMO) in fifth generation (5G) technology. Initially, the single antenna element is designed at three different center frequencies of 0.85, 1.9 and 2.6 GHz to cover the mobile operating frequency of 0.8, 0.85, 0.9, 1.8, 2.1 and 2.6 GHz, which considering the proposed 5G spectrum below than 6 GHz. The rectangular-shaped ring slot is introduced to the patch antenna with the partial ground plane to widen the bandwidth performance. The designed single element is then arranged to design planar arrays of 2 x 2. Each of elements in the planar array is fed by a coaxial probe. The designs are utilizing a high-performance substrate, Rogers 6010LM.
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.12816
      Issue No: Vol. 17, No. 5 (2019)
  • Electronics System Thermal Management Optimization using Finite Element
           and Nelder-Mead Method

    • Authors: Nurul Kausar Ab Majid, Fatimah Sham Ismail
      First page: 2268
      Abstract: The demand for high-performance, smaller-sized, and multi-functional electronics component poses a great challenge to the thermal management issues in a printed circuit board (PCB) design. Moreover, this thermal problem can affect the lifespan, performance, and the reliability of the electronic system.  This project presents the simulation of an optimal thermal distribution for various samples of electronics components arrangement on PCB. The objectives are to find the optimum components arrangement with minimal heat dissipation and cover small PCB area. Nelder-Mead Optimization (NMO) with Finite Element methods have been used to solve these multi-objective problems. The results show that with the proper arrangement of electronics components, the area of PCB has been reduced by 26% while the temperature of components is able to reduce up to 40%. Therefore, this study significantly benefits for the case of thermal management and performance improvement onto the electronic product and system.
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.12796
      Issue No: Vol. 17, No. 5 (2019)
  • An Improved Security and Message Capacity using AES and Huffman Coding on
           Image Steganography

    • Authors: Christy Atika Sari, Giovani Ardiansyah, De Rosal Ignatius Moses Setiadi, Eko Hari Rachmawanto
      First page: 2276
      Abstract: Information security is very important and has been widely implemented. Cryptography and steganography are two common methods that can be implemented to secure and conceal the information. In this research, the proposed AES algorithm for cryptography and DWT for steganography. However, in case of implementing DWT as a steganography, there is a weakness which is a lower capacity. Based on DWT’s problem, proposed Huffman Coding to reduce the total of message’s bit and increase the capacity. In the implementation, a message will be processed by using AES and compressed by using Huffman Coding then conceal in a cover using DWT. After doing several experiments using a 128x128 pixel message image and a 512x512 pixel of the cover image, achieved the average of MSE is 1.5676 and the average of PSNR result is above 40db which is 46.1878
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i1.9570
      Issue No: Vol. 17, No. 5 (2019)
  • Breakdown on Low Density Poly Ethylene film due to Partial Discharge in
           Air Gap and Its Correlation with Electrical Properties and Surface

    • Authors: eka putra waldi
      First page: 2285
      Abstract: This paper describes the breakdown characteristic of the low density poly ethylene film caused by partial discharge in the air gap. The purpose of this paper is to clarify the effect number of discharge under repetition rectangular pulses with a needle-plane electrode system as a function of pulse frequency. The result performed, from 10 Hz up to 1000 Hz. From 10 Hz to 200 Hz, the pulse number up to breakdown did not change significantly with increasing the pulse frequency and the magnitude of partial discharge function of pulse number with varied frequency until breakdown were similar. By using both potential decay and surface degradation analysis function of number of pulse, the breakdown phenomena caused by partial discharge was shown to reveal a significant correlation between electrical properties and the transparency of its surface to change deposited on it by a partial discharge exposure.
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.12245
      Issue No: Vol. 17, No. 5 (2019)
  • Information System of Limboto Lake Potential Management

    • Authors: Lanto Ningrayati Amali, Sunarty Eraku, Ishak Isa, Rifadli Bahsuan, Sitti Suhada, Muhammad Rifai Katili
      First page: 2292
      Abstract:  Limboto Lake is one of the lakes in Gorontalo Province; its water supply is generated from 23 small and large rivers. The lake holds potential in several sectors, e.g., tourism, fisheries, socio-economy and culture. However, such an advantage has no quality information system as it is found that there are no particular services that manage the information regarding Limboto Lake accurately. The objective of this research is to create an information system for the management of the potential area of the lake to provide quality services to access the information accurately and completely. The provided information is also updated timely. This research employed the System Development Life Cycle (SDLC) method in the development of the information system. Furthermore, the data were collected from interview, observation, and reviewing literature and document. This system is tested using white box and black box where it generated the expected outcome and is web-based. The output of this research is a system that eases the society to access the information regarding the management of the potential area in Limboto Lake.
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.11800
      Issue No: Vol. 17, No. 5 (2019)
  • Main Energy-Efficient MAC Protocols for Wireless Sensor Networks: A Survey

    • Authors: DJIMLI Abdelmalek, MERNIZ Salah, HAROUS Saad
      First page: 2301
      Abstract: MAC Protocols enables sensor nodes of the same WSN to access a common shared communication channel. Many researchers have proposed different solutions explaining how to design and implement these protocols. The main goal of most MACs protocols is how to prolong lifetime of the WSN as long as possible by reducing energy consumption since it is often impossible to change or to recharge sensors’ batteries. The majority of these protocols designed for WSN are based on “duty-cycle” technique. Every node of the WSN operates on two periods: active period and sleep period to save energy. Until now (to our knowledge) there is no ideal protocol for this purpose. The main reason relies on the lack of standardization at lower layers (physical layer) and (physical) sensor hardware.  Therefore, the MAC protocol choice remains application-dependent. A useful MAC protocol should be able to adapt to network changes (topology, nodes density and network size). This paper surveys MAC protocols for WSNs and discusses the main characteristics, advantages and disadvantages of currently popular protocols.
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.12163
      Issue No: Vol. 17, No. 5 (2019)
  • An Empiric Path Towards Fraud Detection and Protection for NFC-Enabled
           Mobile Payment System

    • Authors: Pinki Prakash Vishwakarma
      First page: 2313
      Abstract: The synthesis of NFC technology accompanying mobile payment is a state-of-the-art resolution for payment users. In view of rapid development in electronic payment system there is rise in fraudulent activity in banking transactions associated with credit cards and card-not-present transaction. M-Commerce aid the consumers and helps to bestow real-time information in payment system. Due to the familiarization of m-commerce there is cogent increase in the number of fraudulent activities, emerging in billions of dollar loss every year worldwide. To absolute the security breaches, payment transactions could be confined by considering various parameters like user and device authentication, consumer behavior pattern, geolocation and velocity. In this paper we formally assay NFC-enabled mobile payment fraud detection ecosystem using score-based evaluation method. The fraud detection ecosystem will provide a solution based on transaction risk-modeling, scoring transaction, business rule-based, and cross-field referencing. The score-based evaluation method will analyze the transaction and reckon every transaction for fraud risk and take pertinent decision.
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.12290
      Issue No: Vol. 17, No. 5 (2019)
  • Crowdsourcing in Developing Repository of Phrase Definition in Bahasa

    • Authors: Husni Thamrin, Gunawan Ariyanto, Irma Yuliana, Wawan Joko Pranoto
      First page: 2321
      Abstract: Language repository is valuable as a reference in using the language, its preservation, and in developing and implementation of natural language processing algorithms. Bahasa Indonesia is one of natural languages that hardly has repository despite its large number of speakers and previous attempts to build ones. We devised a way to develop repository of phrase definition in Bahasa using a kind of crowdsourcing and investigated its implementation. An application add-on was inserted to an information system that manages final year projects of undergraduate students. The add-on invites students to participate in writing keyword definition and validating definition. Investigation in a period of six months reveals that about 25% of application users take parts into the voluntary activities either as definition writers and/or validators. During the period, about 1200 phrase definitions were added into the repository and in average each definition is validated by two participants. The activity is supported by users that are well aware of the tasks, and have positive perception about the work, despite different reasons that motivate their contribution.
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.12005
      Issue No: Vol. 17, No. 5 (2019)
  • Blind Multi-Signature Scheme Based On Factoring And Discrete Logarithm

    • Authors: Duc Tan Nguyen, Hai Nam Nguyen, Minh Hieu Nguyen
      First page: 2327
      Abstract: One of the important objectives of information security systems is providing authentication of the electronic documents and messages. In that, blind signature schemes are an important solution to protect the privacy of users in security electronic transactions by highlighting the anonymity of participating parties. Many studies have focused on blind signature schemes, however, most of the studied schemes are based on single computationally difficult problem. Also digital signature schemes from two difficult problems were proposed but the fact is that only finding solution to single hard problem then these digital signature schemes are breakable. In this paper, we propose a new signature schemes base on the combination of the RSA and Schnorr signature schemes which are based on two hard problems: IFP and DLP. Then expanding to propose a single blind signature scheme, a blind multi-signature scheme, which are based on new baseline schemes
      PubDate: 2019-10-01
      DOI: 10.12928/telkomnika.v17i5.10525
      Issue No: Vol. 17, No. 5 (2019)
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
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