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28,910 Article Results

Image Reconstruction Based on Combination of Inverse Scattering Technique and Total Variation Regularization Method

10.11591/ijeecs.v5.i3.pp569-576
Nor Haizan Jamali , Kismet Anak Hong Ping , Shafrida Sahrani , Dayang Azra Awang Mat , Mohamad Hamiruce Marhaban , Mohd Iqbal Saripan , Toshifumi Moriyama , Takashi Takenaka
The Forward-Backward Time-Stepping (FBTS) had proven its potential to reconstruct images of buried objects in inhomogeneous medium with useful quantitative information about its size, shape, and locality. The Total Variation regularization method was incorporated with the FBTS algorithm to deal with the ill-posedness or ill-conditionedness of the inverse problem. The effectiveness of the proposed technique is confirmed by numerical simulations. The numerical method was carried out on a simple object detection through FBTS with and without TV regularization method. The detection and reconstruction of relative permittivity and conductivity of the simple object have shown an improvement as TV regularization method applied whereas it smoothed the vibrations of the images and gave a better estimation of the image’s boundaries.
Volume: 5
Issue: 3
Page: 569-576
Publish at: 2017-03-01

Desktop Tomography System using Planar ECT Device

10.12928/telkomnika.v15i2.6116
Shahrulnizahani; Universiti Teknologi Malaysia Mohammad Din , Nur; Universiti Teknologi Malaysia Adila Mohd Razali , Jaysuman; Universiti Teknologi Malaysia Pusppanathan , Chee; Universiti Tunku Abdul Rahman Pei Song , Ruzairi; Universiti Tun Hussein Onn Malaysia (UTHM) Abdul Rahim , Leow; Universiti Teknologi Malaysia Pei Linga
Miniaturized planar electrical capacitance tomography (ECT) device is fabricated using microfabrication method to accommodate eight planar electrodes to carry out electrical capacitance measurement using tomography technique. Fluids within the detection chamber are detected by the difference of the permittivity parameters. Stagnant and hydrodynamic multiphase samples such as liquid-gas and liquid-liquid are tested. The eight-electrode planar array is fabricated on the copper plated printed circuit board (PCB) and the chamber is fabricated using polymer poly(dimethyl-siloxane) (PDMS). The images of the multiphase sample are reconstructing using Linear Back Projection algorithm (LBP). Computer interface software is developed to display the images of the fluid online. Experimental results show that the reconstructed images closely resemble with the composition of the multiphase sample within the detection chamber.
Volume: 15
Issue: 2
Page: 778-785
Publish at: 2017-03-01

Measurement of 3 Solar Panel Output with Different Treatment Involving Controller and Reflector

10.12928/telkomnika.v15i1.3478
Yulinar; Sriwijaya University Adnan , Khairul; Sriwijaya University Saleh , Assaidah; Sriwijaya University Assaidah
Solar cell as one of renewable energy source had been treated differently in this research. In order to optimize its output and efficiency, three panels output was measured simultaneously by vary its movement and sun light exposure. The variations of measurement  are one static panel without any treatment; one static panel with two mirrors as reflector; and one dynamic panel with reflector. The dynamic panel movement controlled by microcontroller. Result had revealed that the treatment succesfully improve the output of solar cell.
Volume: 15
Issue: 1
Page: 138-142
Publish at: 2017-03-01

Reliability Evaluation of Low-voltage Switchgear Based on Maximum Entropy Principle

10.12928/telkomnika.v15i1.4255
Zhang; Province-Ministry Joint Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability，Hebei University of Technology, Tianjin, China Zhigang , Wang; Province-Ministry Joint Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability，Hebei University of Technology Jingqin , Wang; Province-Ministry Joint Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability，Hebei University of Technology, Tianjin, China Li , Wang; Province-Ministry Joint Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability，Hebei University of Technology, Tianjin, China Meng
In this paper, based on the definition of two-parameter joint entropy and the maximum entropy principle, a method was proposed to determine the prior distribution by using the maximum entropy method in the reliability evaluation of low-voltage switchgear. The maximum entropy method takes kinds of priori information as different constraints. The optimal prior distribution was selected by maximizing entropy under these constraints, which not only contains the known prior information but also tries to avoid the introduction of other assumption information. Based on non-parametric bootstrap method, the hyper-parameters of prior distribution is obtained by two-order moment of prior information. Finally, with the bootstrap method, the prior distribution robustness and the posterior robustness were analyzed, and the posterior mean time between failures for the low-voltage switchgear was estimated.
Volume: 15
Issue: 1
Page: 101-108
Publish at: 2017-03-01

Tapered Microchannel for Multi-particles Passive Separation Based on Hydrodynamic Resistance

10.11591/ijeecs.v5.i3.pp628-635
Ida Laila Ahmad , Mohd Ridzuan Ahmad
Researches on separation of multi-particles utilizing microfluidic have been flourishing in recent years with the aid from advancements in microfabrication design and technology. Generally, separation is beneficial for biomedical application especially involving heterogeneous samples. Due to inherent problems of samples isolation, a simple and efficient separation device is required. Here, we present a passive tapered microchannel for multi-particles separation using hydrodynamic principle. Our emphasis is on the effect of hydrodynamic resistance coupled with tapered microchannel design. In the experiment, successful multi-particles samples separation was observed. The results were further analyzed and were in agreement with the proposed concept. This method opens the route toward robust, low-cost and high-throughput, thus it may holds potential to be integrated as one functional module in micro total analysis system.
Volume: 5
Issue: 3
Page: 628-635
Publish at: 2017-03-01

Potentiometric Glucose Detection by Paper-based Electrochemical Sensor on CMOS Chip

10.12928/telkomnika.v15i2.6129
Katsuyuki; Ritsumeikan University Yamaoka , Jun; Ritsumeikan University Eguchi , Shigeyasu; Ritsumeikan University Uno
This paper presents a low cost portable medical device for biochemical sensor using CMOS chip and paper-based fluidic channel. We measured a potential produced by enzyme activity of glucose between the working and reference electrode on CMOS chip. A liquid sample is transported by paper-based fluidic channel, which is made of chromatography paper and silicone resin, and consists of the area for filtering a sample (filter layer) and that for reacting enzyme (enyzme layer). The paper-based fluidic channel is used by combining CMOS chip, and the solution with glucose is dropped from top of the paper-based fluidic channel. The concentrations of glucose are detected by potentiometry (open circuit potential time). The experimental results show that the glucose concentration is measured by CMOS chip and paper-based fluidic channel.
Volume: 15
Issue: 2
Page: 836-841
Publish at: 2017-03-01

A Review of Heuristic Global Optimization Based Artificial Neural Network Training Approahes

10.11591/ijai.v6.i1.pp26-32
D. Geraldine Bessie Amali , Dinakaran M.
Artificial Neural Networks have earned popularity in recent years because of their ability to approximate nonlinear functions. Training a neural network involves minimizing the mean square error between the target and network output. The error surface is nonconvex and highly multimodal. Finding the minimum of a multimodal function is a NP complete problem and cannot be solved completely. Thus application of heuristic global optimization algorithms that computes a good global minimum to neural network training is of interest. This paper reviews the various heuristic global optimization algorithms used for training feedforward neural networks and recurrent neural networks. The training algorithms are compared in terms of the learning rate, convergence speed and accuracy of the output produced by the neural network. The paper concludes by suggesting directions for novel ANN training algorithms based on recent advances in global optimization.
Volume: 6
Issue: 1
Page: 26-32
Publish at: 2017-03-01

Open-circuit Fault Diagnosis for Grid-connected NPC Inverter based on Independent Component Analysis and Neural Network

10.12928/telkomnika.v15i1.3677
Xiaofeng; Nanchang University Wan , Hailin; Nanchang University Hu , Yunjun; Nanchang University Yu , Liping; Wireless Laboratory, ZTE Co., Shenzhen Kang , Fanpeng; Jiangsu Lin Yang energy Co., Ltd, Qidong Zeng
This paper is under in-depth investigation due to suspicion of possible plagiarism on a high similarity indexAn open circuit (O-C) fault detection method for grid-connected neutral-point-clamped (NPC) inverter based on independent component analysis (ICA) and neural network (NN) is proposed in this paper. A NN classifier is applied to the fault diagnosis of NPC inverter. The ICA is utilized for the three phase current feature extraction. The ICA reduces the number of NN input neuron. A lower dimensional input space reduces the noise and the training time of NN, the ICA algorithm improves the mapping performance. The proposed algorithm is evaluated with simulation test set. The overall classification performance of the proposed network is more than 97%. The simulation results show that the proposed algorithm performs satisfactorily to fault location.
Volume: 15
Issue: 1
Page: 36-47
Publish at: 2017-03-01

A Framework for Classifying Indonesian News Curator in Twitter

10.12928/telkomnika.v15i1.4557
Jaka E.; Telkom University Sembodo , Erwin; Telkom University B. Setiawan , ZK A.; Telkom University Baizal
News curators in twitter are a user, which is interested in following, spreading, giving feedback of recent popular articles. There are two kinds of this user, news curator as human user and news aggregator as bot user. In prior works about news curator, the classification system built using followers, URL, mention and retweet feature. However, there are limited prior works for classifiying Indonesian News Curator in twitter and still hard for labelling data involve just two features: followers and URL. In this paper, we proposed a framework for classifying Indonesian news curator in twitter using Naïve Bayes Classifier (NBC) and added features such as location, bio profile, and common tweet. Another purpose for analysing the influential features of certain class, so its make easier for labelling data of this role in the future. Examination result using percentage split as evaluating system produced 87% accuracy. The most influential features for news curator are followers, bio profile, mention and retweet. For news aggregator class are followers, location, and URL. The rest just common tweet feature for not both class. We implemented Feature Subset Selection (FSS) for increasing system performance and avoiding the over fitting data, it has produced 92.90% accuracy.
Volume: 15
Issue: 1
Page: 357-364
Publish at: 2017-03-01

Portable Electrochemical Gas Sensing System with a Paper-Based Enzyme Electrode

10.12928/telkomnika.v15i2.6142
Shogo; Ritsumeikan University Kawahara , Yukio; Ritsumeikan University Fuchigami , Shoji; Ritsumeikan University Shimokawa , Yousuke; Ritsumeikan University Nakamura , Tatsumi; Ritsumeikan University Kuretake , Masao; Ritsumeikan University Kamahori , Shigeyasu; Ritsumeikan University Uno
An unconventional portable electrochemical gas sensor composed of a smartphone, a finger-sized sensing chip and a single use paper-based enzyme electrode was proposed to detect a particular target gaseous inclusion for self-breath-analysis with ease. This attempt allowed us to monitor our physical status immediately and continuously regardless of a time, place or person due to the improved convenience, immediacy, and affordability. The custom CMOS chip with the capability of performing an amperometric determination when the power voltage supplied from the earphone jack of a smartphone was designed as an analytical device. A disposable enzyme electrode was prepared simply from a chromatography paper and a commercial carbon pencil instead of the conventional indisposable material and complex manufacturing process. The quantification of ethanol in gaseous samples was demonstrated in range from 50 to 500ppm (V/V) in accord with concentrations in exhaled breath. The response current increased linearly with increasing vapor ethanol concentration.
Volume: 15
Issue: 2
Page: 895-902
Publish at: 2017-03-01

Compound Control of Electromagnetic Linear Actuator Based on Fuzzy Switching

10.12928/telkomnika.v15i1.4685
Zhu; Huaiyin Institute of Technology Jianhui , Wang; Huaiyin Institute of Technology Cheng , Dai; Huaiyin Institute of Technology Jianguo
Due to the motion control system of electromagnetic linear actuator (EMLA) is a nonlinear system with poor controllability, single control strategy has been difficult to meet the requirements of its control. A compound control strategy based on inverse system control (ISC) and proportional-integral (PI) is designed in this paper. Switching between two algorithms, which is based on the fuzzy rules, prevents the control algorithm to jitter and jump. System model is build under Matlab/Simulink to do simulation analysis. The designed controller is integrated into the system simulation model and the system software of digital signal processor (DSP) controller. Simulation and test results show that the compound control strategy using fuzzy switching rules achieves the smooth transition of two control algorithms, and the goal of any position location, and continuous adjustment in 0~4mm lift. Positioning accuracy is up to ± 0.02mm, while the response time is less than 10ms.
Volume: 15
Issue: 1
Page: 273-282
Publish at: 2017-03-01

Forkloader Position Control for A Mini Heavy Loaded Vehicle using Fuzzy Logic-Antiwindup Control

10.12928/telkomnika.v15i2.6110
Wan; Universiti Malaysia Pahang (UMP) Mohd Nafis Wan Lezaini , Addie; Universiti Malaysia Pahang (UMP) Irawan , Sheikh; Vacuumschmelze (M) Sdn. Bhd Norhasmadi Sheikh Ali
This paper presents a proposed integrated Takagi-Sugeno-Kang (TSK) type Fuzzy Logic control (TSK-FLC) with Antiwindup elements for a forkloader position control of a Mini Heavy Loaded Forklift Autonomous Guided Vehicle (MHeLFAGV). The study was carried out by modeling TSK-FLC as a close-loop control for the each axis of the fork-lift’s movement. The degree of membership is designed with reference to the system response, in which ultrasonic sensor with 1cm resolution is used. Moreover, the rule base is determined and optimized to deal with microcontroller processing speed. In order to cater for the windup phenomenon, a proportional and integrated antiwindup elements are integrated into the TSK-FLC model. This control strategy consumes less memory and is expected to increase the time response of the control system. The experiment and analysis is done on the actual forkloader unit of MHeLFAGV system. The experiment was done on the vertical axis motion since horizontal motion will have the same characteristic pattern of implementation and characteristic of tuning. The experiment shows that the proposed integrated TSK-FLC with antiwindup elements is able to speed up the time response of the system and eliminate the overshoot as well as oscillation on the forkloader movement.  
Volume: 15
Issue: 2
Page: 739-745
Publish at: 2017-03-01

Interfade Duration Statistics at Ku-band for Satellite Earth Links System in Equatorial Malaysia: Modeling Distribution

10.12928/telkomnika.v15i2.6152
Mawarni; Universiti Teknikal Malaysia Melaka (UTeM) Universiti Teknologi Malaysia (UTM) Mohamed Yunus , Jafri; Universiti Teknologi Malaysia (UTM) Din , Siat; Universiti Tun Hussein Onn Malaysia (UTHM) Ling Jong
 Fade dynamics is one of more important parameters when implementing Fade Mitigation Techniques (FMTs) to counteract an excessive attenuation that affect satellite communication systems operating above 10 GHz. The statistics of probable duration between two rain fade namely interfade duration enables system operator to estimate how long the system will need to recover before the next outage and assist in designing the FMTs. In this paper, interfade duration statistics have been derived from one year of slant path attenuation measurements data collected in Equatorial Johor Bahru at 12.2 GHz with elevation angle of 75.61o. The result had shown the dependency of number of events with attenuation thresholds. Empirical interfade duration statistics are also obtained and suitable model distribution are proposed. 
Volume: 15
Issue: 2
Page: 964-970
Publish at: 2017-03-01

B-BabelNet: Business-Specific Lexical Database for Improving Semantic Analysis of Business Process Models

10.12928/telkomnika.v15i1.3176
Endang Wahyu; Universitas Muhammadiyah Surakarta Pamungkas , Riyanarto; Institut Teknologi Sepuluh Nopember Sarno , Abdul; Institut Teknologi Sepuluh Nopember Munif
Similarity calculation between business process models has an important role in managing repository of business process model. One of its uses is to facilitate the searching process of models in the repository. Business process similarity is closely related to semantic string similarity. Semantic string similarity is usually performed by utilizing a lexical database such as WordNet to find the semantic meaning of the word. The activity name of the business process uses terms that specifically related to the business field. However, most of the terms in business domain are not available in WordNet. This case would decrease the semantic analysis quality of business process model. Therefore, this study would try to improve semantic analysis of business process model. We present a new lexical database called B-BabelNet. B-BabelNet is a lexical database built by using the same method in BabelNet. We attempt to map the Wikipedia page to WordNet database but only focus on the word related to the domain of business. Also, to enrich the vocabulary in the business domain, we also use terms in the business-specific online dictionary (businessdictionary.com). We utilize this database to do word sense disambiguation process on business process model activity’s terms. The result from this study shows that the database can increase the accuracy of the word sense disambiguation process especially in particular terms related to the business and industrial domains.
Volume: 15
Issue: 1
Page: 407-414
Publish at: 2017-03-01

Design of LDPC Decoder Based On FPGA in Digital Image Watermarking Technology

10.12928/telkomnika.v15i1.4044
Zhongxun; Institute of Science and Technology for Opto-Electronics Information, Yantai University, Yantai, China Wang , Tiantian; Key Laboratory of Applied Electronics, Yantai University, Yantai, China Tang
LDPC code and digital image watermarking technology, which is an effective method of digital copyright protection and information security, has been widely used. But this is a multi-disciplinary, multi technology application scheme. In order to realize FPGA design of LDPC decoder in the application scheme, an effective implementation method of digital watermarking application system must be found. In this paper, MATLAB software and Qt development environment are combined to achieve the digital watermarking application software design. It could get real-time input data for the LDPC decoder. Then the hardware of the LDPC decoder is primarily implemented by FPGA in the digital image watermarking system. And the serial port is used to make the output data of the decoder back to computer for verification. Through the simulation results, the Modelsim time simulation diagram is given, and the watermark image compared with the original image is got. The results show that the resource usage of our system is few, and the decoding rate is fast. It has a certain practical value.
Volume: 15
Issue: 1
Page: 457-463
Publish at: 2017-03-01
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