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29,905 Article Results

Analysis Review on Performance Metrics for Extraction Schemes in Text Steganography

10.11591/ijeecs.v11.i2.pp761-767
Raihan Sabirah Sabri , Roshidi Din , Aida Mustapha
In today's era of big data computer networks, protection of secret messages when transmitting information is a major concern. The openness and publicity of the communication channel are the main attraction for malicious people to steal personal data even though privacy protection in operational. Data extraction is process that reverses the data embedding process in information hiding. However, the performance of an information hiding framework highly depends on the evaluation metrics used. The effectiveness of evaluation itself is mainly determined by the performance aspect or critera such as capacity, imperceptibility or security. The aim of this paper is to present a review on trends for existing performance metrics used in extraction schemes from a data hiding framework. This review is hoped to help future research in evaluating the performance of data hiding framework in general and the proposed extraction schemes in specific.
Volume: 11
Issue: 2
Page: 761-767
Publish at: 2018-08-01

Design and Fabrication of the Novel Miniaturized Microstrip Coupler 3dB Using Stepped Impedance Resonators for the ISM Applications

10.12928/telkomnika.v16i4.9230
Azzeddine; Hassan 1st University of Settat Sardi , Jamal; Hassan 1st University of Settat Zbitou , Ahmed; Hassan 1st University of Settat Errkik , Mohamed; Microwave Group Latrach
In this work, a novel miniaturized compact coupler using the shunt-stubs artificial transimission lines with high and low impedances is presented. Design of the proposed coupler is accomplished by modifying the length and impedance of the branch lines in the conventional structure with the planar resonators in order to achieve branch line coupler with compact size and improvement of the performances. First part of this work is focusing on the theorical study of the proposed resonators where the equations are obtained. Secondly, the proposed coupler is designed on FR4 susbtrate, and simulated by using the EM Solver (ADS from Agilent technologies and CST microwave studio) in order to operate in the ISM band. The obtained results show good agreement with the simulations and the coupler shows a good perfo6rmance in the hole bandwidth. The size of the proposed coupler is reduced around 50% compared to the conventional design. The last part conerns the fabrication and test of the proposed coupler. The measurement and simulation results are in good agreements.
Volume: 16
Issue: 4
Page: 1560-1567
Publish at: 2018-08-01

Sub Microsecond Analysis of Negative Cloud-To-Ground Lightning Flashes

10.11591/ijeecs.v11.i2.pp711-717
A.I.A. Rahman , M.A. Bahari , Z.A. Baharudin , A.A. Zulkefle , M. Zainon , M.A.M. Hanafiah
This paper expounds a development software for the identification of lightning discharge in cloud-to-ground flashes. The study was to reduce a misleading detection of the electric field radiation of a lightning discharge profile by considering the important parameters of sub microseconds structure of lightning return stroke. The software was built-in MATLAB. The development of the software considered the important parameter of return strokes such as peak value, zero crossing, rising time and fast transition time. We used a modelling technique for training and patterning the 19 return stroke from electric radiation field generated by the negative cloud-ground lightning flashes recorded in Universiti Teknikal Malaysia Melaka. The 19 return strokes data were recorded by using Lecroy HDO4024 with 5 MS/s. The results showed that the software had the ability to recognize the lightning parameters such as peak value, zero crossing, rising time and fast transition time. In conclusion, the software was able solved the uncertainty of the unknown cloud-to-ground lightning flashes parameter.
Volume: 11
Issue: 2
Page: 711-717
Publish at: 2018-08-01

Fingerprint Pattern of Matching Family with GLCM Feature

10.12928/telkomnika.v16i4.8534
Bahtiar; STMIK Mataram Imran , Karya; STMIK Mataram Gunawan , Muhammad; STMIK Mataram Zohri , Lalu Darmawan; STMIK Mataram Bakti
In this research, fingerprint pattern matching is done to find out whether there is the similarity between parent and child fingerprint pattern. An important step in fingerprint matching is the fingerprint pattern search and matching. Fingerprint data is used by 11 families from various families. The method used in fingerprint feature extraction is GLCM. The GLCM angle used is 0o, and the features used are contrast, homogeneity, correlation, and energy. For fingerprint pattern matching use minutiae score. From the results obtained GLCM has been widely used in fingerprint texture analysis. This study proves that the proposed method for matching fingerprints on parents and children gets the most dominant pattern is the loop pattern.
Volume: 16
Issue: 4
Page: 1864-1869
Publish at: 2018-08-01

Effect of Anchoring Groups on the Conduction Properties of Terphenyl Molecules Connected to Copper Leads

10.12928/telkomnika.v16i4.5900
Setianto; Universitas Padjadjaran Setianto , Aswad; Universitas Padjadjaran H.S. , K.M.; Universitas Padjadjaran Liu
We report equilibrium and non-equilibrium conductance of terphenyl molecules with different anchoring groups including sulfur and nitrogen atom. The corresponding molecules are terphenyl-dithiols (TPDT) and diamino-terphenyl (DATP). The non-equilibrium Green's function (NEGF) technique has been implemented on the density functional tight-binding (DFTB) code to perform computations of the electronic transport properties of molecular devices. The NEGFs are used to compute the electronic density self-consistently with open boundary condition naturally encountered in transport problem which is imposed by the potentials at the contacts. As result, the value of the molecular conductance with amine groups is higher about ten times than the thiol anchored group.
Volume: 16
Issue: 4
Page: 1445-1448
Publish at: 2018-08-01

Optimum Work Frequency for Marine Monitoring Based on Genetic Algorithm

10.12928/telkomnika.v16i4.7328
Fahraini; Mercu Buana University Bacharuddin , Hadi; Mercu Buana University Wuryanto , Yuliza; Mercu Buana University Yuliza , Beny; Mercu Buana University Nugraha
The communication using of HF (High Frequency) is a system that depends on wave propagation using sky waves reflected by the earth's ionosphere layer so that it is highly effective for long distance communication, but highly dependent on varying ionospheric conditions from day and night (time after time) as well as the location of the transmitter and receiver radio. Currently, there is only one main frequency channel and one reserve frequency channel so that there are frequency constraints unable to communicate due to ionosphere changes. This research will predicted allocation of HF frequency to support long distance communication for marine monitoring using Genetic Algorithm method. Output or prediction results in the form of Optimum Work Frequency (OWF) for 24 hours and frequency graph.
Volume: 16
Issue: 4
Page: 1551-1559
Publish at: 2018-08-01

Development of Pose Estimation Algorithm for Quranic Arabic Word

10.12928/telkomnika.v16i4.9048
Luqman Naim Mohd; International Islamic University Malaysia Esa , Malik Arman; International Islamic University Malaysia Morshidi , Syarah Munirah Mohd; International Islamic University Malaysia Zailani
The study carried out in this report proposes the best keypoint detection, description, and pose estimation algorithm combination for Quranic Arabic words. Oriented-FAST Rotated-BRIEF (ORB) and Accelerated-KAZE (AKAZE) are used as the keypoint detection and description algorithms while Random Sample Consensus (RANSAC) and Least Median Squares (LMEDS) are used to evaluate the homography for pose estimation algorithms. The algorithms are combined with each other to provide four different techniques to estimate the pose of Quranic Arabic words. The algorithms are tested on a limited dataset chosen from a phrase within the Quran. Performance of each algorithm is measured in real-time through inlier to keypoint ratio which determines pose accuracy.
Volume: 16
Issue: 4
Page: 1633-1641
Publish at: 2018-08-01

Non-uniform Rooftop PVs Distribution Effect to Improve Voltage Profile in Residential Feeder

10.12928/telkomnika.v16i4.7789
Zamzami; Politeknik Negeri Lhokseumawe Zamzami , Nelly; Politeknik Negeri Lhokseumawe Safitri , Fauzi; Politeknik Negeri Lhokseumawe Fauzi
This paper presents the simple design of a grid-tied single-phase with distributed rooftop photovoltaic (PV) non-uniformly location and ratings. All the inclusion components in the developed scheme are estimated and defined as the inevitability of low voltage (LV) residential network. This developed scheme is purposed for allocating AC and DC load, which are divided into four steps: the sized determination of PV inverter (1-5kW), the selection of PV array, the size determination of battery and the selection of other supporting components. The purposed configuration consists of modeling the system with non-uniform distributions of rooftop PVs, modeling the rooftop PVs based on their injected active and reactive power, and finally the inclusion of battery storage, based on its state of charge (SOC). Due to test the configuration, several cases are built in the MATLAB platform. Simulation results have been generated and analyzed for an unbalanced three-phase residential feeder which is populated with rooftop PVs and battery storage (BS). The simulation results show that the unbalanced reduction due to the coordinate of PVs and BS that provided educated energy storage when the unequal loadings are there, have significant effect toward the anxiety of the distribution network are successfully done.
Volume: 16
Issue: 4
Page: 1388-1395
Publish at: 2018-08-01

Pattern Analysis of Goals Scored in Malaysia Super League 2015

10.11591/ijeecs.v11.i2.pp718-724
Nazim Razali , Aida Mustapha , Filipe Manuel Clemente , Md Fauzi Ahmad , Mohamad Aizi Salamat
This paper is set to study the pattern of goals scored across 132 matches in 2015 Malaysian Super League (MSL). Despite of well-known researches in European football, no information in Malaysian football teams has been done consistently. To identify the patterns, this research focuses on goals scored based on timing that includes scoring frequency, the impact of first goal achieved by team towards the final match outcome, as well as the impact of having home advantage for matches during MSL 2015.  The findings of this paper will provide useful information on MSL besides helping coaches with fresh insight for creating effective training and tactical plan as the time progressed during match. At the same time, players will also be more prepared for a consistent performance especially when training for matches as the visiting teams.
Volume: 11
Issue: 2
Page: 718-724
Publish at: 2018-08-01

Design of Miniaturized Multiband Patch Antenna Using CSRR for WLAN/WiMAX Applications

10.12928/telkomnika.v16i4.9064
Murtala Aminu; Universiti Teknologi Malaysia (UTM) Baba , Mohammad Kamal A; Universiti Teknologi Malaysia (UTM) Rahim , Farid; Universiti Teknologi Malaysia (UTM) Zubir , Mohd Fairus Mohd; Universiti Teknologi Malaysia (UTM) Yusoff
A novel miniaturized multiband, single-feed microstrip patch antenna is presented in this paper for WLAN and WiMAX applications. Both size reduction and multiband are obtained by etching the Multiple Complementary Split Ring Resonators (MC-SRR) on the ground plane of the normal patch antenna. At first, the normal patch antenna produces a single band of 5.15 GHz; 200 MHz (5.0500~5.2499). Subsequently, a Single Circular Split Ring Resonator (SC-SRR) is etched on the ground plane and produces a triple band of: 3.25 GHz; 288 MHz (3.1085~3.3964), 4.5 GHz; 101.3 MHz (4.4488~4.5501), and 5.22 GHz; 220 MHz (5.1191~5.3400) and Double Single Circular Split Ring Resonator (DC-MCSRR) with: 2.99 GHz; 60.7 MHz (2.9574~3.0181), 3.57 GHz; 324.7 MHz (3.4065~3.7312), and 5.1413 GHz; 115.4 MHz (5.0817~5.1971). The working bandwidths cover the desired frequency bands of WLAN 5.2 GHz and WiMAX 3.3/3.5 GHz. The proposed (MC-SRR) antenna can be employed to wireless communication systems due to its simplicity in design, compactness and miniaturization.
Volume: 16
Issue: 4
Page: 1838-1845
Publish at: 2018-08-01

Reliability Constrained Unit Commitment Considering the Effect of DG and DR Program

10.11591/ijece.v8i4.pp1985-1996
Masoud Aliakbari , Pouria Maghouli , Habib Allah Aalami
Due to increase in energy prices at peak periods and increase in fuel cost, involving Distributed Generation (DG) and consumption management by Demand Response (DR) will be unavoidable options for optimal system operations. Also, with high penetration of DGs and DR programs into power system operation, the reliability criterion is taken into account as one of the most important concerns of system operators in management of power system. In this paper, a Reliability Constrained Unit Commitment (RCUC) at presence of time-based DR program and DGs integrated with conventional units is proposed and executed to reach a reliable and economic operation. Designated cost function has been minimized considering reliability constraint in prevailing UC formulation. The UC scheduling is accomplished in short-term so that the reliability is maintained in acceptable level. Because of complex nature of RCUC problem and full AC load flow constraints, the hybrid algorithm included Simulated Annealing (SA) and Binary Particle Swarm Optimization (BPSO) has been proposed to optimize the problem. Numerical results demonstrate the effectiveness of the proposed method and considerable efficacy of the time-based DR program in reducing operational costs by implementing it on IEEE-RTS79.
Volume: 8
Issue: 4
Page: 1985-1996
Publish at: 2018-08-01

A Model to Predict The Live Bodyweight of Livestock Using Back-Propagation Algorithm

10.12928/telkomnika.v16i4.6716
Inggih; University of Sultan Syarif Kasim Riau Permana , Ria; University of Sultan Syarif Kasim Riau Agustina , Endah; University of Sultan Syarif Kasim Riau Purnamasari , Febi Nur; University of Sultan Syarif Kasim Riau Salisah
Cattle is the most popular livestock in Indonesia. Assessments of the live bodyweight of cattle can be conducted through weighing or predicting. Weighing is an accurate method, but it is not efficient due to the prices of scales that most traditional farmers cannot afford. Prediction is a more affordable technique however occurrences of error remains high. To deal with this issue this research has created a model predicting the live bodyweight of cattle through Back-Propagation algorithm. There are four morphometric variables examined in this study: (1) body length; (2) withers height; (3) chest girth; and (4) hip width. Based on comparative results with conventional prediction methods, Schoorl Indonesia and Schoorl Denmark, showed that the method offered has a lower error. Rate of error is 60.54% lower than Schoorl Denmark and 53.95% lower than Schoorl Indonesia.
Volume: 16
Issue: 4
Page: 1667-1672
Publish at: 2018-08-01

A Novel Forecasting Based on Automatic-optimized Fuzzy Time Series

10.12928/telkomnika.v16i4.8430
Yusuf Priyo; Brawijaya University Anggodo , Wayan Firdaus; Brawijaya University Mahmudy
In this paper, we propose a new method for forecasting based on automatic-optimized fuzzy time series to forecast Indonesia Inflation Rate (IIR). First, we propose the forecasting model of two-factor high-order fuzzy-trend logical relationships groups (THFLGs) for predicting the IIR. Second, we propose the interval optimization using automatic clustering and particle swarm optimization (ACPSO) to optimize the interval of main factor IIR and secondary factor SF, where SF = {Customer Price Index (CPI), the Bank of Indonesia (BI) Rate, Rupiah Indonesia /US Dollar (IDR/USD) Exchange rate, Money Supply}. The proposed method gets lower root mean square error (RMSE) than previous methods.
Volume: 16
Issue: 4
Page: 1809-1817
Publish at: 2018-08-01

Microinverter Topology based Single-stage Grid-connected Photovoltaic System: A Review

10.11591/ijeecs.v11.i2.pp645-651
A. Razi , M. Nabil Hidayat , M. N. Seroji
This paper discussed the topology development of a single-stage microinverter in grid-connected PV system. In general, the microinverter topologies can be categorized into four type of topologies:          1) Flyback inverter, 2) Double-boost inverter, 3) Derived zeta-cuk configuration and 4) Buck-boost inverter. Flyback configuration is widely used for single-stage microinverter which offers protection between solar panel and utility grid. However due to the bulkiness of the transformer, new arrangement circuit employ the Half-Bridge topology with film capacitor and microcontroller provide a good room for research and future developments to obtain greater efficiency and compact design of single-stage microinverter grid-connected PV system. Plus, there are several characteristics need to be taken care for future development of the microinverter technology.
Volume: 11
Issue: 2
Page: 645-651
Publish at: 2018-08-01

Beam Steering using the Active Element Pattern of Antenna Array

10.12928/telkomnika.v16i4.9040
Norun Abdul; International Islamic University Malaysia Malek , Othman Omran; International Islamic University Malaysia Khalifa , Zuhairiah Zainal; Universiti Tun Hussein Onn Malaysia (UTHM) Abidin , Sarah Yasmin; International Islamic University Malaysia Mohamad , Nur Aqilah Abdul; International Islamic University Malaysia Rahman
An antenna array is a set of a combination of two or more antennas in order to achieve improved performance over a single antenna. This paper investigates the beam steering technique using the active element pattern of dipole antenna array. The radiation pattern of the array can be obtain by using the active element pattern method multiplies with the array factor. The active element pattern is crucial as the mutual coupling effect is considered, and it will lead to an accurate radiation pattern, especially in determining direction of arrival (DoA) of a signal. A conventional method such as the pattern multiplication method ignores the coupling effect which is essential especially for closely spaced antenna arrays. The comparison between both techniques has been performed for better performance. It is observed that the active element pattern influenced the radiation pattern of antenna arrays, especially at the side lobe level. Then, the beam of the 3x3 dipole antenna array has been steered to an angle of 60° using three techniques; Uniform, Chebyshev and Binomial distribution. All of these are accomplished using CST and Matlab software.
Volume: 16
Issue: 4
Page: 1542-1550
Publish at: 2018-08-01
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