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28,188 Article Results

A Study on Image Reconfiguration Algorithm of Compressed Sensing

10.12928/telkomnika.v15i1.3710
Zhang; Northeast Petroleum University Yubo , Wang; Northeast Petroleum University Dongmei , Lingling; Northeast Petroleum University Kan , Panpan; Northeast Petroleum University Zhao
Compressed sensing theory is a subversion of the traditional theory. The theory obtains data sampling points while achieves data compression. The main content of this thesis is reconstruction algorithm. It’s the key of the compressed sensing theory, which directly determines the quality of reconstructed signal, reconstruction speed and application effect. In this paper, we have studied the theory of compressed sensing and the existing reconstruction algorithms, then choosing three algorithms (OMP, CoSaMP, StOMP) as the research. On the basis of summarizing the existing algorithms and models, we analyze the results such as PSNR, relative error, matching ratio and running time of them from image signal respectively. In the three reconstruction algorithms, OMP algorithm has the best accuracy for image reconstruction. The convergence speed of CoSaMP algorithm is faster than that of the OMP algorithm’s, but it depends on sparsity K quietly. StOMP algorithm on image reconstruction effect is the best, and the convergence speed is also the fastest.
Volume: 15
Issue: 1
Page: 299-305
Publish at: 2017-03-01

Design of Planar Dielectric Resonator Antenna Array at 28 GHz

10.11591/ijeecs.v5.i3.pp622-627
Nuramirah Mohd Nor , Mohd Haizal Jamaluddin , Muhammad Ramlee Kamarudin , Siti Zareen Naqiyah Zool Ambia
This article presents a planar array of rectangular Dielectric Resonator Antenna operating for 28 GHz applications. The proposed antenna is formed through two stages of designs which are a single element and planar array. It is made up from a ceramic material with a dielectric constant of 10 and mounted on RT/Duroid 5880 with a relative permittivity of 2.2 and a thickness of 0.254 mm. A prospective study using three different configurations of three by three planar array is done in order to obtain the best performance in terms of bandwidth, gain, and cost reduction. Besides that, this study is also conducted for a beam steering capability of each configuration. Finally, the best configuration is proposed for 5G application.
Volume: 5
Issue: 3
Page: 622-627
Publish at: 2017-03-01

Streaming Audio Using MPEG–7 Audio Spectrum Envelope to Enable Self-similarity within Polyphonic Audio

10.12928/telkomnika.v15i1.4581
Jonathan; Ulster University Doherty , Kevin; Ulster University Curran , Paul; Ulster University McKevitt
One method overlooked to date, which can work alongside existing audio compression schemes, is that which takes account of the semantics and natural repetition of music through meta-data tagging. Similarity detection within polyphonic audio has presented problematic challenges within the field of Music Information Retrieval.  This paper presents a method (SoFI) for improving the quality of stored audio being broadcast over any wireless medium through meta-data which has a number of market applications all with market value. Our system works at the content level thus rendering it applicable in existing streaming services. Using the MPEG-7 Audio Spectrum Envelope (ASE) gives features for extraction and combined with k-means clustering enables self-similarity to be performed within polyphonic audio. SoFI uses string matching to identify similarity between large sections of clustered audio. Objective evaluations of SoFI give positive results which show that SoFI is shown to detect high levels of similarity on varying lengths of time within an audio file. In a scale between 0 and 1 with 0 the best, a clear correlation between similarly identified sections of 0.2491 shows successful identification.
Volume: 15
Issue: 1
Page: 190-202
Publish at: 2017-03-01

Direct Torque Control: Stator Flux Regulation Improvement at Low Speed

10.12928/telkomnika.v15i1.5419
Nik Rumzi; Universiti Teknologi Malaysia Nik Idris
A simple method to improve stator flux regulation of a direct torque control (DTC) of induction motor drive is presented. By using this method, the simple control structure of DTC is retained and no modification to the voltage vectors look-up table is required. To implement this technique, the index to the look-up table is modified so that the reverse voltage vectors are selected (instead of zero-voltage vectors) whenever the stator flux regulation fails. To study the viability and the effectiveness of this simple method in improving the flux regulation at low speed, experiments are conducted to a ¼ hp induction motor with DTC technique. The control algorithm is implemented using a DS1104 controller board with Xilinx FPGA. 
Volume: 15
Issue: 1
Page: 1-3
Publish at: 2017-03-01

Autism Spectrum Disorders Gait Identification Using Ground Reaction Forces

10.12928/telkomnika.v15i2.6143
Che; Universiti Teknologi MARA Zawiyah Che Hasan , Rozita; Universiti Teknologi MARA Jailani , Nooritawati; Universiti Teknologi MARA Md Tahir , Rohilah; Universiti Teknologi MARA Sahak
 Autism spectrum disorders (ASD) are a permanent neurodevelopmental disorder that can be identified during the first few years of life and are currently associated with the abnormal walking pattern. Earlier identification of this pervasive disorder could provide assistance in diagnosis and establish rapid quantitative clinical judgment. This paper presents an automated approach which can be applied to identify ASD gait patterns using three-dimensional (3D) ground reaction forces (GRF). The study involved classification of gait patterns of children with ASD and typical healthy children. The GRF data were obtained using two force plates during self-determined barefoot walking. Time-series parameterization techniques were applied to the GRF waveforms to extract the important gait features. The most dominant and correct features for characterizing ASD gait were selected using statistical between-group tests and stepwise discriminant analysis (SWDA). The selected features were grouped into two groups which served as two input datasets to the k-nearest neighbor (KNN) classifier. This study demonstrates that the 3D GRF gait features selected using SWDA are reliable to be used in the identification of ASD gait using KNN classifier with 83.33% performance accuracy. 
Volume: 15
Issue: 2
Page: 903-911
Publish at: 2017-03-01

Energy Efficient Routing Protocols for Underwater Wireless Sensor Networks: A Review

10.12928/telkomnika.v15i1.4706
Mukhtiar; University Technology Malaysia Ahmed , Mazleena; UTM, Malaysia Salleh , M. Ibrahim; Department of I.T, QUEST, Nawabshah Sindh Pakistan. Channa , Mohd Foad; UTM, Malaysia Rohani
The Underwater Sensor Network (UWSN) is main interesting area due to its most valuable applications like: disaster preventions, distributed tactical surveillance, undersea exploration, seismic monitoring, environmental monitoring and many more. The design of energy efficient routing protocol is a challenging issue because in underwater environment the batteries of the sensor nodes cannot be recharged easily. Majority of the researchers have adapted the terrestrial WSN methodologies to overcome this problem but in underwater environment the terrestrial WSN approach is not feasible due to the acoustic signaling and water current. This research paper focuses the key limitation of the energy efficient routing protocols. The simulation results with comparative analysis for energy efficient routing protocols are also presented in this research article; which helps the researchers to find the further research gap in the field of energy efficient routing protocols.
Volume: 15
Issue: 1
Page: 212-219
Publish at: 2017-03-01

Techno-Economic Analysis of Stand-Alone Hybrid Energy System for the Electrification of Iran Drilling Oil Rigs

10.12928/telkomnika.v15i2.6111
Abdullah; Universiti Teknologi Malaysia (UTM) Asuhaimi Mohd Zin , Mehdi; Universiti Teknologi Malaysia (UTM) Moradi , Jalal; Universiti Teknologi Malaysia Tavalaei , Amirreza; Universiti Teknologi Malaysia (UTM) Naderipour , Amir; Universiti Teknologi Malaysia (UTM) Hesam Khavari , Mohammad; Universiti Teknologi Malaysia (UTM) Moradi
This paper explores the potential of use of stand-alone hybrid wind/solar energy system in electrification of calibrating equipment of drilling oil rig in Iran. To achieve this, different hybrid energy system configurations based on calibration equipment demand are proposed. This study puts emphasis on the energy production and cost of energy from both wind turbine and photovoltaic (PV) in the hybrid system. In addition, to make conditions more realistic, the real meteorological data is used for HOMER software to perform the technical and economic analysis of the hybrid system. Results indicate that the PV array shares more electricity production than the wind turbine generator if both wind turbine and PV array are utilized in the wind/solar hybrid system. Moreover, results show that the operational cost will be reduced by the suggested hybrid system.
Volume: 15
Issue: 2
Page: 746-755
Publish at: 2017-03-01

Measurement of Dielectric Properties of Low-Density Polyethylene Nanocomposites Using “Sub-Hertz” Dielectric Spectroscopy

10.12928/telkomnika.v15i2.6153
Mohammad; Universiti Teknologi Malaysia Syamim Mohammad Basri , Lailatul; Universiti Teknologi Malaysia Akmal Abdul Rauf , Mohd; Universiti Teknologi Malaysia Hafizi Ahmad , Noor; Universiti Teknologi Malaysia Azlinda Ahmad , Yanuar; Universiti Teknologi Malaysia Z. Arief , Zulkarnain; Universiti Teknologi Malaysia Ahmad Noorden
Recently, many studies have been conducted on the dielectric properties of Low-Density Polyethylene (LDPE) nanocomposites and produced different results. However, the composition of LDPE polymer and boron nitride (BN) as nanofiller has neither been well understood nor producing a convenient result. Similarly, the dielectric spectroscopy measured at “sub–hertz” frequency has been of little interest among researchers since it is often influenced by “conduction-like” effect. This research identified the dielectric properties of LDPE nanocomposites filled with hexagonal boron nitride (h-BN) nanofillers by using dielectric spectroscopy technique. The dielectric loss and relative permittivity for three different filler concentrations were investigated under “sub-hertz” frequency ranges at room temperature. The cylindrical electrode with guard ring configuration was used to conduct the experiment, in accordance to the ASTM D150 standard. The results revealed that 5 wt% filled polymer has lower loss tangent and permittivity compared to the unfilled polymer, due to the strong interaction between nano-particle and the polymer. This strong interaction is believed to limit the movement of the polymer chain. The decrease in loss tangent also indicates lower quasi-DC at low frequency. However, further increase in the filler loading has recorded an increment in the value of permittivity and loss tangent. This higher effective permittivity is mainly due to the influence of the filler permittivity.
Volume: 15
Issue: 2
Page: 971-976
Publish at: 2017-03-01

Novel Artificial Magnetic Conductor for 5G Application

10.11591/ijeecs.v5.i3.pp636-642
Maizatun Muhamad , Maisarah Abu , Zahriladha Zakaria , Hasnizom Hassan
A design of novel bendable Artificial Magnetic Conductor (AMC) structures has been presented in this paper in two selected of frequencies at 5G application. These designs started with a square patch shape and continued with the combination of circular and Jerusalem shape which resonate at a frequency of 18 GHz and 28 GHz. Details of the theory and the structures of AMCs are explained. The reflection phase, bandwidth, angular stability and dispersion diagram were studied. The simulated results plotted that the novel AMC has good bandwidth and size is reduced by 53 percent and 55 percent for both frequencies. Other than that, it is also proved that the novel AMC has a stable reflection phase and no band gap performs at the specific frequency. The good performances of this novel AMC make it useful in order to improve antenna’s performance.
Volume: 5
Issue: 3
Page: 636-642
Publish at: 2017-03-01

Reduced Software Complexity for E-Government Applications with ZEF Framework

10.12928/telkomnika.v15i1.3195
Ahmad Nurul; Bina Nusantara University Fajar , Imam; UIN Syarif Hidayatullah Jakarta Marzuki Shofi
The situation of dynamic change is unpredictable and always growth increasingly. It also can happen anytime and anywhere. The one kind which is always changing is the government policy.This condition is suggested take the impact for software for information system. It will cause replacement, modification, and enhancement of software for information system. There is some commonality and variability of software features in Indonesian Government. Hence, to manage it, we present enhancement of Zuma’s E-Government Framework (ZEF) for reduce software complexity.We enhance ZEF Framework using  SPLE and GORE approach in order to improve traditional software development.It can reduce, if the changing continuously happen.The measurement of  software complexity relate to functionality of system.It can describe with function point, because function point can describe logical software complexity also. The preliminary result of this study can reduce efficiency of software complexity such as information processing size, technical complexity adjustment factors and function points in e-government applications.
Volume: 15
Issue: 1
Page: 415-420
Publish at: 2017-03-01

Model and Analysis of Multi Level Multi Frequency RF Rectifier Energy System for Low Power Supply Application Device

10.12928/telkomnika.v15i1.4051
Budi; Indonesian Computer University (UNIKOM) Herdiana , Bobi; Indonesian Computer University (UNIKOM) Kurniawan
Sustainable energy for the mobile electronic devices always needed during the energy storage batteries capacity in the mobile electronic devices are limited for a few hours for the usage time. To get a long lasting operating time from the mobile electronics equipment sets, the energy source should always be connected into the device. In this paper, we were proposed a charging energy method via wireless operation supply using the microwaves (RF) radiated by the air multi-frequency. The RF to DC rectifier circuit is a major component for changing the RF wave to an electronic current (DC). The Dickson models were used as an approach to superiority includes a simple series, low DC ripple factor, etc. The design, analysis, and the experimentation from the rectifier circuit have been conducted and presented in this paper. In the measurement, the mobile electronic devices placed at a distance about 5 meters from the energy source with the system voltage DC 3.7V, and have been obtained at the working frequency between 825 - 960MHz with the PCE values 12-33%, and a ripple factor of ± 0,01%. The charging time energy is needed about 4 hours at the research trial room, and about 11 hours outdoor had been observed. Based on these results, the wirelessly energy charging method for the mobile electronic devices is a potential methods to resolve the sustainable energy issue and the green technology supporting with the most programs. 
Volume: 15
Issue: 1
Page: 238-244
Publish at: 2017-03-01

Entity Annotation WordPress Plugin using TAGME Technology

10.12928/telkomnika.v15i1.4631
William; Universitas Multimedia Nusantara Aprilius , Seng; Universitas Multimedia Nusantara Hansun , Dennis; Universitas Multimedia Nusantara Gunawan
The development of internet technology makes more information can be accessed. It makes information need to be organized in order to be easily managed. One solution can be used is by using the entity annotation approach which generates tags to represent that document. In this study, TAGME technology is implemented on a WordPress plugin, which is used to manage a blog. Moreover, information on Wikipedia ‘Bahasa Indonesia’ is processed to generate an anchor dictionary which is required by the technology that is implemented. This plugin performs entity annotation by giving tag suggestion for posts in a blog. Testing is carried out by measuring the precision, recall, and  of tag suggestions given by the plugin. The result shows that the plugin can give tag suggestions with precision 0.7638, recall 0.5508, and  0.59.
Volume: 15
Issue: 1
Page: 486-493
Publish at: 2017-03-01

Prediction of Bioprocess Production Using Deep Neural Network Method

10.12928/telkomnika.v15i2.6124
Amirah; Universiti Teknologi Malaysia Baharin , Afnizanfaizal; Universiti Teknologi Malaysia Abdullah , Siti; Universiti Teknologi Malaysia Noorain Mohmad Yousoff
Deep learning enhanced the state-of-the-art methods in genomics allows it to be used in analysing the biological data with high prediction. The training process of neural network with several hidden layers which has been facilitated by deep learning has been subjected into increased interest in achieving remarkable results in various fields. Thus, the extraction of bioprocess production can be implemented by pathway prediction in genomic metabolic network in eschericia coli. As metabolic engineering involves the manipulation of genes which have the potential to increase the yield of metabolite production. A mathematical model of this network is the foundation for the development of computational procedure that directs genetic manipulations that would eventually lead to optimized bioprocess production. Due to the ability of deep learning to be well suited in terms of genomics, modelling for biological network can be implemented. Each layer reveal the insight of biological network which enable pathway analysis to be implemented in order to extract the target bioprocess production. In this study, deep neural network has been to identify any set of gene deletion models that offers optimal results in xylitol production and its growth yield. 
Volume: 15
Issue: 2
Page: 805-813
Publish at: 2017-03-01

Mathematical Modeling and Fuzzy Adaptive PID Control of Erection Mechanism

10.12928/telkomnika.v15i1.3568
Feng; Xi’an High-tech Research Institute Jiangtao , Gao; Xi’an High-tech Research Institute Qinhe , Guan; Xi’an High-tech Research Institute Wenliang
This paper describes an application of fuzzy adaptive PID controller to erection mechanism. Mathematical model of erection mechanism was derived. Erection mechanism is driven by electro-hydraulic actuator system which is difficult to control due to its nonlinearity and complexity. Therefore fuzzy adaptive PID controller was applied to control the system. Simulation was performed in Simulink software and experiment was accomplished on laboratory equipment. Simulation and experiment results of erection angle controlled by fuzzy logic, PID and fuzzy adaptive PID controllers were respectively obtained. The results show that fuzzy adaptive PID controller can effectively achieve the best performance for erection mechanism in comparison with fuzzy logic and PID controllers.
Volume: 15
Issue: 1
Page: 254-263
Publish at: 2017-03-01

Multi-feature Fusion Using SIFT and LEBP for Finger Vein Recognition

10.12928/telkomnika.v15i1.4443
Hardika; Institut Teknologi Sepuluh Nopember Khusnuliawati , Chastine; Institut Teknologi Sepuluh Nopember Fatichah , Rully; Institut Teknologi Sepuluh Nopember Soelaiman
In this paper, multi-feature fusion using Scale Invariant Feature Transform (SIFT) and Local Extensive Binary Pattern (LEBP) was proposed to obtain a feature that could resist degradation problems such as scaling, rotation, translation and varying illumination conditions. SIFT feature had a capability to withstand degradation due to changes in the condition of the image scale, rotation and translation. Meanwhile, LEBP feature had resistance to gray level variations with richer and discriminatory local characteristics information. Therefore the fusion technique is used to collect important information from SIFT and LEBP feature.The resulting feature of multi-feature fusion using SIFT and LEBP feature would be processed by Learning Vector Quantization (LVQ) method to determine whether the testing image could be recognized or not. The accuracy value could achieve 97.50%, TPR at 0.9400 and FPR at 0.0128 in optimum condition.  That was a better result than only use SIFT or LEBP feature.
Volume: 15
Issue: 1
Page: 478-485
Publish at: 2017-03-01
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