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28,188 Article Results

Conductive and Inductive Coupling between Faulted Power Lines and Buried Pipeline by Considering the Effect of Soil Structure

10.11591/ijeecs.v5.i3.pp656-660
Ali I. El Gayar , Zulkurnain Abdul-Malek , Mohammed Imran M , Chin Leong Wooi , Ibtihal Fawzi Elshami
The AC total interference of faulted power lines to gas pipelines sharing the same right of way, which may pose a threat to operating personnel and equipment, was studied. The main advantage of this work is to determine the effects of different soil structures on the induced voltage for various soil resistivities. Two main approaches were used to compute the induced voltages, namely the method of moment (MOM), which is based on electromagnetic field theory, and the circuit based method, which uses the circuit grounding analysis to compute the conductive interference and the circuit based models to compute the inductive interference. A 10-km-long parallel pipeline-transmission line model was developed. The soil resistivity was varied, and the induced voltages obtained from both approaches were compared. Soil resistivity and soil structure are important parameters that affect the AC interference level. The results of the study show that the earth potentials and the metal GPRS are independent. Higher soil resistivity causes the tower ground resistance to increase, thus making the shield wire’s attractiveness as a fault current return path to increase, which in turn forces the induced net EMF and the cumulative GPR in the pipeline to reduce.
Volume: 5
Issue: 3
Page: 656-660
Publish at: 2017-03-01

Research on Steer-by-Wire System in Electric Vehicle

10.12928/telkomnika.v15i1.4449
Zhang; School of Automobile, Xi′an Avigation College Yonghui , Chen; School of Automobile, Chang’an University, Xi’an 710064,China Dingyue , Yu; Taiyuan Normal University jiayu , Wang; School of Automobile, Xi′an Aeronautical University Yue , Chen; Taiyuan Normal University Lihao , Chen; Taiyuan Normal University junyu
This paper is under in-depth investigation due to suspicion of possible plagiarism on a high similarity indexSteer-by-wire (SBW) system in electric vehicle replaces the mechanical connection between steering wheel and front wheels with cable in the traditional steering system, which overcomes the limitations of the traditional steering system for the drivers. It is a hot research topic in the field of new energy vehicles in the future. The proposed new structure of SBW in electric vehicle is introduced; its integrated control strategy consists of three modules. A coordinated control determines the body forces/moment required to achieve electric vehicle motion objectives. The body forces/moment are allocated to braking and steering subsystems based on phase plane notion. The coordination of these actuators is achieved through the controller of the feedback gains with respect to electric vehicle speed. The gain scheduled steering controller provides the desired yaw rate damping while keeping the yaw-lateral motion decoupled. The simulation test results show the effectiveness of the proposed architecture and steering control system when the SBW in electric vehicle is subject to critical driving situations. Our work provided a reference for further research of SBW system.  
Volume: 15
Issue: 1
Page: 115-124
Publish at: 2017-03-01

The Fusion of HRV and EMG Signals for Automatic Gender Recognition during Stepping Exercise

10.12928/telkomnika.v15i2.6113
Nor Aziyatul Izni; Universiti Teknologi Malaysia Mohd Rosli , Mohd Azizi; Universiti Teknologi Malaysia Abdul Rahman , Malarvili; Universiti Teknologi Malaysia Balakrishnan , Saiful; Universiti Teknologi Malaysia Amri Mazlan , Hairi; Universiti Teknologi Malaysia Zamzuri
In this paper, a new gender recognition approach in accordance with the fusion of features extracted from electromyogram (EMG) and heart rate variability (HRV) during stepping activity using a stair stepper device is proposed. The fusion of EMG and HRV is investigated based on feature fusion approach. The feature fusion is carried out by chaining the feature vector extracted from the EMG and HRV signals. A proposed approach comprises of a sequence of processing steps which are preprocessing, feature extraction, feature selection and the feature fusion. The results demonstrated that the fusion approach had enhanced the performance of gender recognition compared to solely on EMG or HRV for the gender recognition.
Volume: 15
Issue: 2
Page: 756-762
Publish at: 2017-03-01

Design and Analysis of Optimum Performance Pacemaker Telemetry Antenna

10.12928/telkomnika.v15i2.6135
N. H.; Universiti Teknologi Malaysia (UTM) Sulaiman , N. A.; Universiti Teknologi Malaysia (UTM) Samsuri , M. K. A.; Universiti Teknologi Malaysia (UTM) Rahim , F. C.; Universiti Tun Hussein Onn Malaysia (UTHM) Seman , M.; Universiti Teknologi Malaysia (UTM) Inam
The demand for health technology is increasing especially in the telemetry applications. These applications generally use implanted antennas to be utilized for data transfer from patients to other reader devices. This procedure can make the health care more efficient since it provides fast diagnosis and treatment to the patient. Therefore, in order to effectively implement an implanted antenna inside the human body, thorough numerical analysis and simulations are required prior to the fabrication of antenna. In this work, an implanted antenna has been proposed to be designed at 402.5MHz within the biomedical frequency band of 402- 405MHz. By introducing a compact loop antenna for telemetry applications in a Pacemaker, a number of advantages can be achieved for health care such as efficient data information and quick diagnosis. Moreover, in this work an investigation of compact loop antenna with casing in Pacemaker has been carried out by placing the antenna inside the phantom of human body model.
Volume: 15
Issue: 2
Page: 877-882
Publish at: 2017-03-01

Modeling Text Independent Speaker Identification with Vector Quantization

10.12928/telkomnika.v15i1.4656
Syeiva Nurul; Bogor Agricultural University Desylvia , Agus; Bogor Agricultural University Buono , Bib Paruhum; Bogor Agricultural University Silalahi
Speaker identification is one of the most important technology nowadays. Many fields such as bioinformatics and security are using speaker identification. Also, almost all electronic devices are using this technology too. Based on number of text, speaker identification divided into text dependent and text independent. On many fields, text independent is mostly used because number of text is unlimited. So, text independent is generally more challenging than text dependent. In this research, speaker identification text independent with Indonesian speaker data was modelled with Vector Quantization (VQ). In this research VQ with K-Means initialization was used. K-Means clustering also was used to initialize mean and Hierarchical Agglomerative Clustering was used to identify K value for VQ. The best VQ accuracy was 59.67% when k was 5. According to the result, Indonesian language could be modelled by VQ. This research can be developed using optimization method for VQ parameters such as Genetic Algorithm or Particle Swarm Optimization.
Volume: 15
Issue: 1
Page: 322-327
Publish at: 2017-03-01

Graphene Nanoplatelets (GnP)-PVA Based Passive Saturable Absorber

10.12928/telkomnika.v15i2.6126
Nabihah; Universiti Teknologi Malaysia Hussin , Mohd; Universiti Teknologi Malaysia Haniff Ibrahim , Fauzan; Universiti Teknologi Malaysia Ahmad , Hafizal; Universiti Teknologi Malaysia Yahaya , Sulaiman; University of Malaya Wadi Harun
A passive Q-switched pulsed laser at 1.5 m region incorporating graphene nanoplatelets (GnPs) embedded in Polyvinyl Alcohol (PVA) is demonstrated. A surfactant is used to aid the dispersion of the GnPs before it is mixed with PVA to develop a GnPs-PVA film based SA. The SA is integrated into the laser cavity by attaching a cut of the GnPs-PVA film in between two fiber ferrule of the laser ring cavity.The proposed GnPs-PVA film based passive Q–switched laser was able to operate as the input pump power was increased from 39 mW up to a maximum of 148 mW before diminishing. The laser obtained operated with a central wavelength of 1530.76 nm. Repetition rates were obtained at 33 kHz to 91.5 kHz, throughout the tunable input pump power with the shortest pulse width of 2.42 s. Maximum attainable peak power and pulse energy of 1.2 mW and 5.9 nJ, respectively, was recorded, accompanied by a signal to noise ratio (SNR) of 28 dB.
Volume: 15
Issue: 2
Page: 814-819
Publish at: 2017-03-01

An Ensemble of Enhanced Fuzzy Min Max Neural Networks for Data Classification

10.12928/telkomnika.v15i2.6149
Mohammed; University Malaysia Pahang Falah Mohammed , Taha; University Malaysia Pahang H. Rassem
This paper is under in-depth investigation due to suspicion of possible plagiarism on a high similarity indexAn ensemble of Enhanced Fuzzy Min Max (EFMM) neural networks for data classification is proposed in this paper.  The certified belief in strength (CBS) method is used to formulate the ensemble EFMM model, with the aim to improve the performance of individual EFMM networks.  The CBS method is used to measure trustworthiness of each individual EFMM network based on its reputation and strength indicators.  Trust is built from strong elements associated with the EFMM network, allowing the CBS method to improve the performance of the ensemble model. An auction procedure based on the first-price sealed-bid scheme is adopted for determining the winning EFMM network in undertaking classification tasks. The effectiveness of the ensemble model is demonstrated using a number of benchmark data sets. Comparing with the existing EFMM networks, the proposed ensemble model is able to improve classification accuracy rates in the empirical study.
Volume: 15
Issue: 2
Page: 942-948
Publish at: 2017-03-01

MPPT for PV System Based on Variable Step Size Perturb and Observe Algorithm

10.12928/telkomnika.v15i1.3160
Awang; Universiti Teknologi Malaysia Jusoh , Rozana; Universiti Teknologi Malaysia Alik , Tan Kar; Universiti Teknologi Malaysia Guan , Tole; Universitas Ahmad Dahlan Sutikno
This paper presents some improvements on the Perturb and Observe (P&O) method to overcome the common drawbacks of conventional P&O method. The main advantage of this modified algorithm is its simplicity with higher accuracy results, compared to the conventional methods. The operation of the entire solar Maximum Power Point Tracking (MPPT) system was observed through two different approaches, which are through MATLAB/Simulink simulation and hardware implementation. A small scale of hardware design, which consists of solar PV cell, boost converter and Arduino Mega2560 microcontroller had been utilized for further verification on the simulation results. The simulation results that was carried out by this modified P&O algorithm showed improvement and a promising performance: faster convergence speed of 0.67s, small oscillation at steady state region and promising efficiency of 95.23%. Besides, from the hardware results, the convergence time of the power curve was able to maintain at 0.2s and give almost zero oscillation during steady state. It is envisaged that the method is useful in future research of Photovoltaic (PV) system.
Volume: 15
Issue: 1
Page: 79-92
Publish at: 2017-03-01

A Dynamic Programming Approach to Energy-Efficient Scheduling on Multi-FPGA based Partial Runtime Reconfigurable Systems

10.12928/telkomnika.v15i1.3878
Chao; Guilin University of Technology Jing , Qi; Guilin University of Technology Song
This paper has been studied an important issue of energy-efficient scheduling on multi-FPGA systems. The main challenges are integral allocation, reconfiguration overhead and exclusiveness and energy minimization with deadline constraint. To tackle these challenges, based on the theory of dynamic programming, we have designed and implemented an energy-efficient scheduling on multi-FPGA systems. Differently, we have presented a MLPF algorithm for task placement on FPGAs. Finally, the experimental results have demonstrated that the proposed algorithm can successfully accommodate all tasks without violation of the deadline constraint. Additionally, it gains higher energy reduction 13.3% and 26.3% than that of Particle Swarm Optimization and fully balanced algorithm, respectively.
Volume: 15
Issue: 1
Page: 438-447
Publish at: 2017-03-01

Performance of Groundplane Shaping in Four-Element Dualband MIMO Antenna

10.12928/telkomnika.v15i1.5002
Subuh; Politeknik Negeri Semarang Pramono , Tommi; Universitas Pendidikan Indonesia Hariyadi , Budi Basuki; Politeknik Negeri Semarang Subagio
This work presents performance of groundplane shaping and its effect in four element dualband multiple input multiple output (MIMO) antenna. This proposed four element dualband MIMO antenna consists of four bowtie dipole antenna which operates at 1800 MHz (low frequency) and 2300 MHz (high frequency). This proposed four element dualband MIMO antenna occupies a 270 x 210 x  100 mm3  of FR 4 substrate. We use four types  of groundplane pattern i.e. full groundplane, cornered spatial groundplane,crossed middle groundplane, and spiral groundplane. These various grounplane patterns influence the performance of main parameters of dualband MIMO antenna. Cornered spatial groundplane pattern yields a largest bandwidth (VSWR ≤ 2) 282 MHz or 15.24% of center frequency at low frequency. Full groundplane pattern creates 135.2 MHz at high frequency. In addition, cornered spatial groundplane pattern also generates a lowest VSWR  that  is valued 1.21 at both low frequency and high frequency. The S parameters, basically both cornered spatial and full groundplane pattern produce a better return loss than two others. All four groundplane patterns deliver  equally a mutual coupling parameter.The last, this proposed four element dualband MIMO with various groundplane patterns gives a good farfield properties i.e. gain, radiation pattern, H-E field.
Volume: 15
Issue: 1
Page: 220-226
Publish at: 2017-03-01

Wideband Multi-Port Reflectometer as an Alternative in Reflection Coefficient Measurement

10.12928/telkomnika.v15i2.6117
Rashidah; Universiti Teknologi Malaysia Che Yob , Norhudah; Universiti Teknologi Malaysia Seman
 This paper presents the characterization and operation of an alternative device, which is known as multi-port reflectometer to measure the reflection coefficient of any device under test (DUT). Its configuration is formed by two power dividers (D) and four couplers (Q). The characterization is evaluated through the centres of power circles that also known as q-points. Its operation in the reflection coefficient measurement is tested by using three DUTs. The reflectometer’s good performance and wideband operation are proven between the frequency band of 1 and 6 GHz via the practical hardware measurement in the laboratory.
Volume: 15
Issue: 2
Page: 786-792
Publish at: 2017-03-01

High Sensitivity Very Low Frequency Receiver for Earthquake Data Acquisition

10.12928/telkomnika.v15i1.3484
Achmad; Institut Teknologi Bandung Munir , Kusmadi; Institut Teknologi Bandung Kusmadi , Kusnandar; Universitas Jenderal Achmad Yani Kusnandar , Asep; Universitas Jenderal Achmad Yani Najmurrokhman , Chairunnisa; Institut Teknologi Bandung Chairunnisa , Sunubroto; Universitas Jenderal Achmad Yani Sunubroto
A high sensitivity very low frequency (VLF) receiver is developed based on AD744 monolithic operational amplifier (Op-Amp) for earthquake data acquisition. In research related natural phenomena such as atmospheric noise, lightning and earthquake, a VLF receiver particularly with high sensitivity is utterly required due to the low power of VLF wave signals received by the antenna. The developed receiver is intended to have high sensitivity reception for the signals in frequency range of 10-30 kHz allocated for earthquake observation. The VLF receiver which is portably designed is also equipped with an output port connectable to the soundcard of personal computer for further data acquisition. After obtaining the optimum design, the hardware realization is implemented on a printed circuit board (PCB) for experimental characterization. It shows that the sensitivity of realized VLF receiver is almost linear in the predefined frequency range for the input signals lower than -12dBm and to be quadratic for the higher level input signals.
Volume: 15
Issue: 1
Page: 150-155
Publish at: 2017-03-01

A Two Stage Classification Model for Call Center Purchase Prediction

10.12928/telkomnika.v15i1.4269
Kai; Beijing Universiy of Posts & Telecommunications Shuang , Kai-Ze; Beijing Universiy of Posts & Telecommunications Ding , Xi-Hao; Beijing Universiy of Posts & Telecommunications Liu , Xiao-Le; Beijing Universiy of Posts & Telecommunications Wen
In call center [1] product recommendation field, call center as an organization between users and telecom operator, doesn’t have permission to access users specific information and the detailed products information. Accordingly, rule-based selection method is common used to predict user purchase behavior by the call center. Unfortunately, rule-based approach not only ignores the user’s previous behavior information entirely, and it is difficult to make use of the existing interaction records between users and products. Consequently, it will not get desired results if we just use the basic selection method to predict user purchase behavior directly, because the problem is that the features straightly extracted from the interaction data records are limited. In order to solve the problem above, this paper proposes a two-stage algorithm that based on K-Means Clustering Algorithm [2] and SVM [3, 4] Classification Algorithm. Firstly, we get the potential category information of products by K-Means Clustering Algorithm, then use SVM Classification Model to predict users purchasing behavior. This two-stage prediction model not only solves the feature shortage problem, but also gives full consideration to the potential features between users and product categories, which can help us to gain significant performance in call center product recommendation field.
Volume: 15
Issue: 1
Page: 351-356
Publish at: 2017-03-01

Electrochemical Redox Cycling Realized by Chromatography Paper-based Sensor

10.12928/telkomnika.v15i2.6130
Kenichi; Ritsumeikan University Fukayama , Sou; Ritsumeikan University Yamamoto , Shigeyasu; Ritsumeikan University Uno
In this work, we demonstrated that enhancement of electrochemical current due to redox cycling could be accomplished by paper-based biosensor without any expensive micro-fabrication process. The paper-based sensor had layered structure to generate higher current than a conventional one. We took advantage of the fact that the paper thickness was micrometer-sized (180um), and it defined the distance between two electrochemical electrodes on both sides of the paper. Experimental results showed signatures of the redox cycling, where the electrochemical current from low concentration molecules could be arbitrarily increased by decreasing the distance between electrodes. Such a structure was advantageous for detecting target molecules at very low concentration, proposing a low-cost highly-sensitive biochemcal sensor.  
Volume: 15
Issue: 2
Page: 842-846
Publish at: 2017-03-01

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
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