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28,428 Article Results

Embroidery Leaf Shape Dipole Antenna Performances and Characterisation

10.11591/ijece.v7i3.pp1467-1472
N. J. Ramly , M. K. A. Rahim , N. A. Samsuri , H. A. Majid
In this paper, leaf shape textile antenna in ISM band has been chosen to study. The operating frequency of the dipole antenna is 2.45GHz. The effect of conductive threads with three different types of sewing has been analysed. The first type of sewing leaf shape dipole antenna is to stitch around itself and embroidered into a fleece fabric with circular follow by vertical and horizontal stitch respectively. From measured return loss, the antenna with circular stitch shows better performances with optimum resonances compared with the two types of stitching. The measured results confirm that the circular stitch is more suitable for leaf shape dipole antenna design. Thus it can be concluded that different stitch gives different results for leaf shape dipole antenna.
Volume: 7
Issue: 3
Page: 1467-1472
Publish at: 2017-06-01

Experimental Investigation on Vegetative Oils under Accelerated Thermal Ageing against Their Dielectric Strength

10.11591/ijece.v7i3.pp1588-1593
Siti Sufiah Abd Wahid , Mohd Fikri Hilmi Mohd Taib , Yanuar Z. Arief , Mohd Hafizi Ahmad , Noor Azlinda Ahmad , Nor Asiah Muhamad , Zuraimy Adzis , Mohd Hafiez Izzwan Saad
Insulation is one of the most important parts in high voltage apparatus such as power transformer. Most power transformer use liquid insulation material, known as power transformer oil. Petroleum-based oil so called mineral oil has been used for many years as power transformer oil. This is due to its high dielectric field strength, low dielectric loses and good long-term performance. This research work has been carried out to investigate the effect of thermal accelerated ageing on electrical properties for several vegetative-based oils. The oil samples that have been used in this research work are soy bean-based oil (FR3) and commercial palm-based oil (PFAE). As comparison, Hyrax mineral oil has also been investigated. The results revealed that vegetative-based oils have as well as dielectric strength compared with mineral oil.  It was found that the dielectric strength for all oil samples decreased when undergo the thermal accelerated ageing process.
Volume: 7
Issue: 3
Page: 1588-1593
Publish at: 2017-06-01

Localization of Distributed Wireless Sensor Networks using Two Sage SDP Optimization

10.11591/ijece.v7i3.pp1255-1261
Reza Shahbazian , Seyed Ali Ghorashi
A wireless sensor network (WSN) may comprise a large distributed set of low cost, low power sensing nodes. In many applications, the location of sensors is a necessity to evaluate the sensed data and it is not energy and cost efficient to equip all sensors with global positioning systems such as GPS. In this paper, we focus on the localization of sensors in a WSN by solving an optimization problem. In WSN localization, some sensors (called anchors) are aware of their location. Then, the distance measurements between sensors and anchors locations are used to localize the whole sensors in the network. WSN localization is a non-convex optimization problem, however, relaxation techniques such as semi-definite programming (SDP) are used to relax the optimization. To solve the optimization problem, all constraints should be considered simultaneously and the solution complexity order is O(n2) where n is the number of sensors. The complexity of SDP prevents solving large size problems. Therefore, it would be beneficial to reduce the problem size in large and distributed WSNs. In this paper, we propose a two stage optimization to reduce the solution time, while provide better accuracy compared with original SDP method. We first select some sensors that have the maximum connection with anchors and perform the SDP localization. Then, we select some of these sensors as virtual anchors. By adding the virtual anchors, we add more reference points and decrease the number of constraints. We propose an algorithm to select and add virtual anchors so that the total solution complexity and time decrease considerably, while improving the localization accuracy.
Volume: 7
Issue: 3
Page: 1255-1261
Publish at: 2017-06-01

Approximation Measures for Conditional Functional Dependencies Using Stripped Conditional Partitions

10.11591/ijece.v7i3.pp1385-1397
Anh Duy Tran , Somjit Arch-int , Ngamnij Arch-int
Conditional functional dependencies (CFDs) have been used to improve the quality of data, including detecting and repairing data inconsistencies. Approximation measures have significant importance for data dependencies in data mining. To adapt to exceptions in real data, the measures are used to relax the strictness of CFDs for more generalized dependencies, called approximate conditional functional dependencies (ACFDs). This paper analyzes the weaknesses of dependency degree, confidence and conviction measures for general CFDs (constant and variable CFDs). A new measure for general CFDs based on incomplete knowledge granularity is proposed to measure the approximation of these dependencies as well as the distribution of data tuples into the conditional equivalence classes. Finally, the effectiveness of stripped conditional partitions and this new measure are evaluated on synthetic and real data sets. These results are important to the study of theory of approximation dependencies and improvement of discovery algorithms of CFDs and ACFDs.
Volume: 7
Issue: 3
Page: 1385-1397
Publish at: 2017-06-01

Novel Image Mosaicking of UAV’s Imagery using Collinearity Condition

10.11591/ijece.v7i3.pp1188-1196
Martinus Edwin Tjahjadi , Fourry Handoko , Silvester Sari Sai
This paper presents a preliminary result of ongoing research on unmanned aerial vehicle (UAV) for cooperative mapping to support a large-scale urban city mapping, in Malang, Indonesia. A small UAV can carry an embedded camera which can continuously take pictures of landscapes. A convenient way of monitoring landscape changes might be through accessing a sequence of images. However, since the camera’s field of view is always smaller than human eye’s field of view, the need to combine aerial pictures into a single mosaic is eminent. Through mosaics, a more complete view of the scene can be accessed and analyzed. A semi-automated generation of mosaics is investigated using a photogrammetric approach, namely a perspective projection which is based on collinearity condition. This paper reviews the general projection model based on collinearity condition and uses that to determine a common projective plane from images. The overlapped points for each RGB channel are interpolated onto that of orthographic plane to generate mosaics. An initial attempt shows a promising result.
Volume: 7
Issue: 3
Page: 1188-1196
Publish at: 2017-06-01

A Proposal for Mitigating Fishermen Killing in Indian Sea Borders through Technology – Maritime Boundary Identification Device

10.11591/ijeecs.v6.i3.pp704-710
Abhishek SN , Shriram K Vasudevan , Prashant R Nair , Thangavelu S , Sundaram RMD
The Tamil Nadu – Sri Lanka maritime boundary has been responsible for frequent controversies in the global front, due to fishermen from Rameshwaram and Ramanthapuram districts recklessly straying past Indian waters. Instances of Indian fishermen being captured and killed by the Sri Lankan navy have spun vivid images of violence and human rights violation among the masses. Social activists are desperate for an automatic alarm system to warn the fishermen when they are about to cross the border, and avert a possible impending crisis. The following discussion focuses on the design of an alarm signal system that could alert the fishermen on a periodic basis as they approach closer to the maritime boundary. Installing Global Positioning System (GPS) devices would pose several economic challenges. Instead of the conventional approach of using GPS devices to track location, a transmitter – receiver system exquisitely designed to send signals to the boat would be effective. This system helps in keeping a continuous track of the boats. It provides a reliable solution to alert fishermen before they could inadvertently exceed the boundary. 
Volume: 6
Issue: 3
Page: 704-710
Publish at: 2017-06-01

Image Processing of Panoramic Dental X-Ray for Identifying Proximal Caries

10.12928/telkomnika.v15i2.6856
Jufriadif; Universitas Putra Indonesia YPTK Padang Na'am , Johan; Gunadarma University Harlan , Sarifuddin; Gunadarma University Madenda , Eri Prasetyo; Gunadarma University Wibowo
This study aims to facilitate the identification of proximal caries in the Panoramic Dental X-Ray  image. Twenty-seven X-Ray images of proximal caries were elaborated. The images in digital form were processed using Matlab and Multiple Morphological Gradient. The process produced sharper images and clarifies the edges of the objects in the images. This makes the characteristics of the proximal caries and the caries severity can be identified precisely.
Volume: 15
Issue: 2
Page: 702-708
Publish at: 2017-06-01

Performance Evaluation of Gauss-Markov Mobility Model in Hybrid LTE-VANET Networks

10.12928/telkomnika.v15i2.5913
Doan; Telkom University Perdana , Rendy; Telkom University Munadi , Robby C.; Telkom University Manurung
Vehicular Ad-hoc Network (VANET) developed based on mobile ad-hoc networks (MANET). VANET have different characteristics than MANET, on VANET mobile node (MN) moves faster, topology changes dynamically. The previous research shows that the model of mobility affects to the network performance. In this paper, the Gauss-Markov mobility model used to illustrate the motion of the MN, which illustrates changes of acceleration, speed, location, and direction at any time. This paper enriches the evaluation of the performance of Gauss-Markov mobility model on LTE-VANET hybrid network, by evaluating various network performance metrics, particularly, packet delivery ratio (PDR), throughput, and delay. This research evaluated the Gauss-Markov mobility model and performed with the number of nodes and randomness index (α) that varies by utilizing NS-3 software. The results show that there is a strong correlation between PDR, throughput, and delay with the addition number of MNs. Based on the simulation result, the hybrid LTE-VANET produce better delay compared to pure VANET. The average delay is smaller 40% compared to pure VANET. This simulation also concludes that different value of alpha on Gauss-Markov mobility model does not influence PDR, throughput, and delay.
Volume: 15
Issue: 2
Page: 606-621
Publish at: 2017-06-01

A Customized Reconfiguration Controller with Remote Direct ICAP Access for Dynamically Reconfigurable Platform

10.12928/telkomnika.v15i2.5508
Tze Hon; Universiti Teknologi Malaysia Tan , Chia Yee; Universiti Teknologi Malaysia Ooi , Muhammad Nadzir; Universiti Teknologi Malaysia Marsono
As FPGA dynamic partial reconfiguration getting into mainstream, design of reconfiguration controller becomes an active research. Most of the existing reconfiguration controllers support only the loading of partial bitstream into configuration memory without allowing user to access ICAP directly, which can provide user higher controllability over the reconfigurable device. This paper presents the architecture of a customized reconfiguration controller with remote direct ICAP access. Remote direct ICAP access allows user to configure or readback device internal registers, which offer user higher controllability over the reconfigurable device. Additionally, the proposed reconfiguration controller achieved at least 3.19 Gbps of reconfiguration throughput, which reduces the platform service downtime during dynamic partial reconfiguration. In order to reduce the latency and transmission overhead of remote functional update, partial bitstream is compressed with run-length encoding before transmission.
Volume: 15
Issue: 2
Page: 570-577
Publish at: 2017-06-01

Chaotic Mutation Immune Evolutionary Programming for Voltage Security with the Presence of DGPV

10.11591/ijeecs.v6.i3.pp721-729
Sharifah Azma Syed Mustaffa , Ismail Musirin , Mohd. Murthada Othman , Mohd. Helmi Mansor
Due to environmental concern and certain constraint on building a new power plant, renewable energy particularly distributed generation photovoltaic (DGPV) has becomes one of the promising sources to cater the increasing energy demand of the power system. Furthermore, with appropriate location and sizing, the integration of DGPV to the grid will enhance the voltage stability and reduce the system losses. Hence, this paper proposed a new algorithm for DGPV optimal location and sizing of a transmission system based on minimization of Fast Voltage Stability Index (FVSI) with considering the system constraints. Chaotic Mutation Immune Evolutionary Programming (CMIEP) is developed by integrating the piecewise linear chaotic map (PWLCM) in the mutation process in order to increase the convergence rate of the algorithm. The simulation was applied on the IEEE 30 bus system with a variation of loads on Bus 30. The simulation results are also compared with Evolutionary Programming (EP) and Chaotic Evolutionary Programming (CEP) and it is found that CMIEP performed better in most of the cases.
Volume: 6
Issue: 3
Page: 721-729
Publish at: 2017-06-01

Fractal Characteristic of Electrical Trees Grown in Silicone Rubber under Environmental Stress

10.11591/ijece.v7i3.pp1628-1632
M. S. Mohd Fua’ad , M.H. Ahmad , Y. Z. Arief , N. A. Ahmad
One of the degradations of insulation is in the form of electrical treeing in which classified as a pre-breakdown phenomenon of electrical insulation. The electrical tree is commonly forming in the shape of tree-like or root-like which may have fractal structures. Due to this fractal structure, electrical treeing formation and patterns are analysed via fractal dimension and lacunarity to study the self-similarity patterns of electrical treeing. Many types of research have been conducted to study the fractal dimension and lacunarity of electrical treeing to fully understand the electrical tree mechanism and characteristics. However, fractal and lacunarity structures of
Volume: 7
Issue: 3
Page: 1628-1632
Publish at: 2017-06-01

Design of Digital to Analog Voice Data Packet Conversion from Ethernet Protocol using FPGA

10.12928/telkomnika.v15i2.3612
Barlian Henryranu; University of Brawijaya Prasetio , Dahnial; University of Brawijaya Syauqy
This paper describes a system that is designed to be able to receive packet voice signal using the Ethernet protocol in local networks using FPGA which was programmed decode the data packets. The digital data packets are then converted back into analog data that will be used to control another system. The design was implemented as four components consisting of frame starter unit, address matching unit, buffer unit and DAC processing unit. The system was designed on Xilinx development board using ISE design suite and simulated on ISIM. The test results showed that the system response was less than 40 ms. The result also showed that our proposed design only occupies 11% of number of slices and it also requires 5% of total IOBs on Xilinx Spartan 3-E.
Volume: 15
Issue: 2
Page: 646-653
Publish at: 2017-06-01

Design and Performance Analysis of 1.8 GHz Low Noise Amplifier for Wireless Receiver Application

10.11591/ijeecs.v6.i3.pp656-662
A.A Amin , M. S. Islam , A.A.M. Masud , M. N. H. Khan
In present stereo audio system is a most popular audio system for different purposes. Now a day’s stereo system is commonly used in communication and other purposes. Moreover Normalized Least Mean Square (NLMS) based adaptive filtering is an effective filtering process in case of communication and other applications. However adaptive filtering is an adaptive filter process to cancel out the noise from audio signal successfully. Hence the main objective of this paper is to design a NLMS adaptive filter which cancels out the noise from a noisy wave format stereo audio file. Moreover by varying the order of the adaptive filter (such as 8th, 16th, 32th and 64th), the performance of the NMLS adaptive filtered signal with respect to reference and noisy stereo audio signal are analyzed as well.
Volume: 6
Issue: 3
Page: 656-662
Publish at: 2017-06-01

Rhetorical Sentence Classification for Automatic Title Generation in Scientific Article

10.12928/telkomnika.v15i2.4061
Jan Wira Gotama; Institut Teknologi Bandung Putra , Masayu Leylia; Institut Teknologi Bandung Khodra
In this paper, we proposed a work onrhetorical corpus construction andsentence classification model experiment that specifically could be incorporated in automatic paper title generation task for scientific article. Rhetorical classification is treated as sequence labeling. Rhetorical sentence classification model is useful in task which considers document’s discourse structure. We performed experiments using two domains of datasets: computer science (CS dataset), and chemistry (GaN dataset). We evaluated the models using 10-fold-cross validation (0.70-0.79 weighted average F-measure) as well as on-the-run (0.30-0.36 error rate at best). We argued that our models performed best when handled using SMOTE filter for imbalanced data
Volume: 15
Issue: 2
Page: 656-664
Publish at: 2017-06-01

The Humidity Dependence of Pentacene Organic Metal-Oxide- Semiconductor Field Effect Transistor

10.12928/telkomnika.v15i2.5834
Fadliondi; Universitas Muhammadiyah Jakarta Fadliondi , Muhammad Kunta; Tokyo Institute of Technology Biddinika , Shun-ichiro; Tokyo Institute of Technology Ohmi
Metal-oxide-semiconductor field-effect transistors (MOSFET) were fabricated using organic semiconductor pentacene. The humidity dependence of drain current gate voltage (ID-VG) characteristic and drain current drain voltage characteristic (ID-VD) will be explained. Firstly, the thermal oxidation method was used to grow SiO2 gate insulator with thickness of 11 nm. Secondly, the thermal evaporation method was used to form Au source and drain electrodes with thickness of 28 nm. The channel width and length of the transistors were 500 mm and 200 mm, respectively. By the same method, organic semiconductor material pentacene was deposited with thickness of 50 nm at vacuum of 7.8x10-6 Torr. The hole mobility decreased from 0.035 cm2/(Vs) to 0.006 cm2/(Vs), while the threshold voltage increased from 0.5 V to 2.5 V and gate leakage current also increased from 5.8x10-10 A to 3.3x10-9 A when the relative humidity increased from 20% to 70%.
Volume: 15
Issue: 2
Page: 578-583
Publish at: 2017-06-01
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