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28,451 Article Results

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

Robust Visual Tracking with Improved Subspace Representation Model

10.12928/telkomnika.v15i1.4629
Jing; Jiangnan University Cheng , Sucheng; Yancheng Teachers University Kang
This paper is under in-depth investigation due to suspicion of possible plagiarism on a high similarity indexIn this paper, we propose a robust visual tracking with an improved subspace representation model. Different from traditional subspace representation model, we use sparse representation, but not the collaborative representation to reconstruct the observation samples, which can avoid the redundant object features in subspace effectively. Moreover, to reject the outliers in the process of tracking, we also propose the combination of sparse box templates and Laplacian residual. To solve the minimization problem of object representation efficiently, a fast numerical algorithm that accelerated proximal gradient (APG) approach is proposed for the Lagrangian function. Finally, experimental results on several challenging video sequences show better performance than LSST and many state-of-the-art trackers.
Volume: 15
Issue: 1
Page: 328-335
Publish at: 2017-03-01

Mutual Coupling Reduction in Antenna Using EBG on Double Substrate

10.12928/telkomnika.v15i2.6123
Raimi; Universiti Teknologi Malaysia Dewan , M.; Universiti Teknologi Malaysia K.A. Rahim , M.; Universiti Teknologi Malaysia R. Hamid , M.; Universiti Teknologi Malaysia E. Jalil , H.; Universiti Tun Hussein Onn Malaysia A. Majid
In this paper, a mutual coupling studies is conducted between two-element array antenna on dual substrate. A single patch antenna is firstly designed on dual substrate layer to testify appropriate performance at 2.45 GHz. Subsequently, an array of two element patches on dual substrate are constructed with one of them is incorporated with three EBG unit cell on the bottom substrate. The radiating patch is on the top substrate, while the EBG unit cells is on the bottom substrate. With EBGs in separate layers from the antenna array, the antenna elements are closely separated by a distance of 22 mm with a significant reduced mutual coupling of -26.61 dB. This correspond to a distance reduction of 34.68%. The proposed structure implemented only three EBG unit cells. Apart from that, the study of overlapped case of EBG with the antenna is also presented.
Volume: 15
Issue: 2
Page: 799-804
Publish at: 2017-03-01

A Robot Collision Avoidance Method Using Kinect and Global Vision

10.12928/telkomnika.v15i1.3566
Haibin; Fuzhou University Wu , Jianfeng; Fuzhou University Huang , Xiaoning; Fuzhou University Yang , Jinhua; Fuzhou University Ye , Sumei; Fuzhou University He
This paper introduces a robot collision avoidance method using Kinect and global vision to improve the industrial robot’s security. Global vision is installed above the robot, and a combination of the background-difference method and the Otsu algorithm are used. Human skeleton detection is then introduced to detect the location information of the human body. The collided objects are classified into nonhuman and human obstacle which is further categorized into the human head and non-head areas such as the arm. The Kalman filter is used to predict the human gesture. The human joints danger index is used to evaluate the risk level of the human on the basis of human body joints and robot’s motion information. Finally, a motion control strategy is adopted in view of obstacle categories and the human joint danger index. Results show that the proposed method can effectively improve robot’s security in real time.
Volume: 15
Issue: 1
Page: 4-17
Publish at: 2017-03-01

The Application of Wavelet Neural Network in the Settlement Monitoring of Subway

10.12928/telkomnika.v15i1.4310
YI; Tianjin Chengjian University, Tianjin 300384,China Zhenghui , WANG; School of Geology and Geomatics, Tianjin Chengjian University, Tianjin 300384,China Shuaimin , XU; College of Surveying Science and Engineering, Shandong University of Science and Technology, Qingdao 266510,China Yujing , LIU; School of Geology and Geomatics, Tianjin Chengjian University, Tianjin 300384,China Bei
The settlement monitoring of subway runs through the entire construction stage of subway. It is very important to predict the accurate settlement value for construction safety of subway. In this paper, the wavelet transform is used to denoise the settlement data. The auxiliary wavelet neural network, embedded wavelet neural network and single BP neural network are applied to predict the settlement of Tianjin subway. Compared with single BP neural network and auxiliary wavelet neural network, the embedded wavelet neural network model has a higher accuracy and better prediction effect. The embedded wavelet neural network is more valuable than the BP neural network model so it can be used in the prediction of subway settlement
Volume: 15
Issue: 1
Page: 109-114
Publish at: 2017-03-01

Flexible Dual Band Dipole Antenna with Electromagnetic Band Gap

10.11591/ijeecs.v5.i3.pp593-598
Maisarah Abu , Siti Adlina Md Ali , Najmiah Radiah Mohamad , Maizatun Muhamad
Flexible dual band dipole antenna incorporates with Electromagnetic Band Gap (EBG) to improve the well-known low profile characteristics of dipole antenna. The antenna operates at 2.45 GHz and 5.8 GHz which is printed on Fast film with 0.13 mm thickness. While the EBG is designed at 5.8 GHz by using Arlon AD350 with 1.016 mm thickness. EBG works as a ground plane for the antenna and helps by improving the realized gainandradiation pattern. Besides, EBG also act as a filter as the resonant frequency of the antenna is close to the EBG band gap. The 2.45 GHz of is eliminated while the performances of antenna at 5.8 GHz is improved. Thus the realized gain is increased up to 6.86 dB and the back lobes is clearly reduced. The designs of dipole antenna with EBG application such as Wifi and others on-body communication devices.
Volume: 5
Issue: 3
Page: 593-598
Publish at: 2017-03-01

Potential Usage Estimation of Ground Water using Spatial Association Rule Mining

10.12928/telkomnika.v15i1.4750
Suci Sri Utami; Departement of Research and Development Technology, Regional Water Company Bogor City Sutjipto , Imas Sukaesih; Departement of Computer Science, Bogor Agricultural University, Bogor 16680, Indonesia. Sitanggang , Baba; Department of Soil Sciences and Land Resources, Bogor Agricultural University, Bogor 16680, Indonesia. Barus
The utilization of ground water in the long term will lead to a number of negative impacts on groundwater resources and the environment, such as the decrease of groundwater level, seawater intrusion, land subsidence as well as scarcity of ground water. Furthermore, the use of ground water has directly affected the consumption pattern of Regional Water Company Bogor City (PDAM) customers. This study aims to determine the patterns and characteristics of PDAM customers in the utilization of ground water by using spatial association rule mining, so it can help PDAM to approximate the increase of customers that utilize ABT and the losses incurred. This research shows that as many as 53.362 (41.27%) PDAM customers that have the potential to use groundwater. The said customers are featured by several characteristics, such as being active customers, with monthly water bill of less than Rp. 53.358 and are not close to river.
Volume: 15
Issue: 1
Page: 504-511
Publish at: 2017-03-01

Driver`s Steering Behaviour Identification and Modelling in Near Rear-End collision

10.12928/telkomnika.v15i2.6133
Nurhaffizah; Universiti Teknologi MARA Universiti Teknologi Malaysia Hassan , Hairi; Universiti Teknologi Malaysia Zamzuri , Nurbaiti; Universiti Teknologi MARA Universiti Teknologi Malaysia Wahid , Khairul; Universiti Teknologi Malaysia Akmal Zulkepli , Muhammad; Universiti Teknologi Malaysia Zulfaqar Azmi
This paper studies and identifies driver`s steering manoeuvre behaviour in near rear-end collision. Time-To-Collision (TTC) is utilized in defining driver’s emergency threat assessment. The target scenario is set up under real experimental environment and the naturalistic data from the experiment are collected. Four normal drivers are employed for the experiment to perform the manoeuvre. Artificial Neural Network (ANN) is proposed to model the behaviour of the driver`s steering manoeuvre. The results show that all drivers manage to perform steering manoeuvre within the safe TTC region and the modelling results from ANN are reasonably positive. With further studies and improvements, this model would benefit to evaluate the driving reliability to enhance traffic safety and Intelligent Transportation System.
Volume: 15
Issue: 2
Page: 861-868
Publish at: 2017-03-01

Research on Chaotic Firefly Algorithm and the Application in Optimal Reactive Power Dispatch

10.12928/telkomnika.v15i1.3862
Genfu; Institute of Mechanical and Electrical Technology, Jinggangshan University Xiao , Huan; Institute of Electronic and Information Engineering, Jinggangshan University Liu , Yuming; Institute of Mechanical and Electrical Technology, Jinggangshan University Guo , Yanhui; Institute of Mechanical and Electrical Technology, Jinggangshan University Zhou
Firefly algorithm (FA) is a newly proposed swarm intelligence optimization algorithm. The original version of FA usually traps into local optima like many other general swarm intelligence optimization algorithm. In order to overcome this drawback, the chaotic firefly algorithm(CFA) is proposed. The methods of chaos initialization, chaos population regeneration and linear decreasing inertia weight have been introduced into the original version of FA so as to increase its global search mobility for robust global optimization. The CFA is calculated in Matlab and is examined on six benchmark functions. In order to evaluate the engineering application of the algorithm, the reactive power optimization problem in IEEE 30 bus system is solved by CFA. The outcomes show that the CFA has better performance compared to the original version of FA and PSO
Volume: 15
Issue: 1
Page: 93-100
Publish at: 2017-03-01

Netscan and Networx for Management Bandwidth and Traffic with Simple Routing

10.12928/telkomnika.v15i1.4183
Mufadhol; STEKOM Semarang Mufadhol , Guruh; STEKOM Semarang Aryotejo , Agus; STEKOM Semarang Wibowo
Currently, approximately 3.4 billion people are accessing the internet around the world and that number is still growing. This phenomena creates the Internet culture that has a great influence on science, technology and even the world economy. Internet bandwidth is very expensive, which makes an information technology based company have to map the internet accurately either daily, monthly or yearly. That data will be taken into consideration by the company to decide how to provide services that make an internet surfing is a pleasant experience. If not regulated, most likely the traffic and bandwidth will be used up even when it is only shared by a few users. To anticipate this, we need a bandwidth and management traffic system using Netscan and Networx in order to monitoring the usage of Internet.
Volume: 15
Issue: 1
Page: 464-470
Publish at: 2017-03-01
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