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TELKOMNIKA Telecommunication, Computing, Electronics and Control
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Articles 2,663 Documents
Characterization of Layer-by-layer Self-assembled Multi-walled Carbon Nanotube Film Sensor and Its Ethanol Gas-sensing Properties Zhang, Dongzhi; Wang, Kai; Xia, Bokai
TELKOMNIKA Telecommunication, Computing, Electronics and Control Vol 11, No 1: March 2013
Publisher : Universitas Ahmad Dahlan

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Abstract

Multi-wall carbon nanotubes (MWNTs) film-based sensor on the substrate of printed circuit board (PCB) with interdigital electrodes (IDE) were fabricated using layer-by-layer self-assembly, and the electrical properties of MWNTs film sensor were investigated through establishing models involved with number of self-assembled layers and IDE finger gap, and also its ethanol gas-sensing properties with varying gas concentration are characterized at room temperature. Through comparing with the thermal evaporation method, the experiment results shown that the layer-by-layer self-assembled MWNTs film sensor have a faster response and more sensitive resistance change when exposed to ethanol gas, indicated a prospective application for ethanol gas detection with high performance and low-cost.
Low-Cost Based Eye Tracking and Eye Gaze Estimation Darma Putra, I Ketut Gede; Cahyawan, Agung; Perdana, Yandi
TELKOMNIKA Telecommunication, Computing, Electronics and Control Vol 9, No 2: August 2011
Publisher : Universitas Ahmad Dahlan

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Abstract

The costs of current gaze tracking systems remain too high for general public use. The main reason for this is the cost of parts, especially high-quality cameras and lenses and cost development. This research build the low cost based for gaze tracking system. The device is built by utilizing of modified web camera in infrared spectrum. A new technique is also proposed here in order to detect the center pupil coordinate based on connected component labeling. By combination the pupils coordinate detection method with third order polynomial regression in calibration process to determine the gaze point. The experiment results show our system has an acceptable accuracy rate with error pixel 0.39o in visual degree.
Migration from Gasoline to Gaseous Fuel for Small-scale Electricity Generation Systems Panjaitan, Seno Darmawan; Yandri, Yandri; Sukandar, Sukandar; Sitorus, Berlian
TELKOMNIKA Telecommunication, Computing, Electronics and Control Vol 11, No 1: March 2013
Publisher : Universitas Ahmad Dahlan

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Abstract

This paper describes a study that gives a consideration to change fuel source for electricity generator from gasoline to combustible gas. A gaseous fuel conversion technology is presented and its performance is compared with gasoline. In the experiment, two types of load were tested, resistive and resistive-inductive. By using both fuels mostly the power factor (Cos ?) of resistive-inductive load variations were greater than 0.8, and they had slight difference on operational voltage. The drawback of using gaseous fuel is the frequency of the electricity might be up to 10 Hz deviated from the standard frequency (i.e. 50 Hz). In the lab scale experiment, the gasoline consumption increased proportionally with the load increase, while using gaseous fuel the consumption of gas equal for two different load value in the range of 50% maximum load, which is 100 gram per 15 minutes operation. Therefore, the use of gaseous generation system should have average power twice than the required load. The main advantage using gaseous fuel (liquefied petroleum gas or biogas) compared to gasoline is a cleaner emitted gas after combustion.
Limitation of Small-world Topology for Application in Non-dominated Sorting Differential Evolution Li, Junfang; Zhang, Bu-han
TELKOMNIKA Telecommunication, Computing, Electronics and Control Vol 10, No 2: June 2012
Publisher : Universitas Ahmad Dahlan

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Abstract

In the context of complex network theory, the small-world network is famous for the small-world phenomenon, namely six degrees of separation. Different from its wide application in the social, physical and technological network analysis, it can be combined with the mathematical optimization algorithm recently. In this paper, the limitation of small-world network topology for application in multi-objective optimization algorithm is proposed. The optimization algorithm based on small-world network topology may be suitable for solving a few single-objective optimization problems, but has limitation and unobvious effectiveness to deal with many multi-objective optimization problems. This paper takes non-dominated sorting differential evolution algorithm (NSDE) based on small-world topology to solve eight multi-objective optimization problems (MOPs) for example. Compared with early NSDE algorithm, the limitation of the efficiency of small-world topology in NSDE is validated with the Matlab simulation results of eight MOEA test functions of early 2007. The results prove that small-world topology has limitation and unobvious effectiveness to improve a multi-objective optimization algorithm, not as good as to improve a single-objective optimization algorithm.
Recursive Detection of M-ary Signals over Fast Varying Mobile Communication Channel El-Mahdy, Ahmed El-Sayed
TELKOMNIKA Telecommunication, Computing, Electronics and Control Vol 11, No 1: March 2013
Publisher : Universitas Ahmad Dahlan

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Abstract

Mobile radio is characterized by a fast time varying channel. Conventional detectors which designed optimal for non-fading channel exhibit a limited performance in fast time varying channel. In this paper a recursive detector for M-ary signals over fast time varying mobile communication channel is introduced. The proposed detector continuously estimates the channel directly within the metric calculation of the log-likelihood function in a recursive manner. The estimation of the channel is performed by the covariance form of the recursive least square approach. The performance of the detector is evaluated in terms of the misdetection probability. The effects of timing and phase offsets on the performance of detector are examined by simulation. Simulation results show that the proposed detector can accommodate the fast time varying channel with adequate performance.
UHF RFID Tag Antenna For Vehicle License Plate Number (e-Plate) Evizal, Evizal
TELKOMNIKA Telecommunication, Computing, Electronics and Control Vol 11, No 2: June 2013
Publisher : Universitas Ahmad Dahlan

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Abstract

In this research presents a new design of UHF RFID tag antenna for vehicle license plate number (e-plate). The proposed e-plate does not require another gadget or equipment since every vehicle is attached with a vehicle registration plate number and this e-plate embedded together. A low cost FR4 material has been used for its fabrication and there is performance improvement compared to the current tag antenna. The proposed antenna design works at 902-928 MHz frequency band for UHF RFID application with 3.8 dbi antenna gain. The antenna is rectangular in shape and has a dimension of 300 mm x 100 mm, which is usually the typical size of the conventional vehicle registration plate number. Acceptable responses were obtained in simulation at centre frequency of 915 MHz with reflection coefficient of -57.7 dB.  The performance of proposed e-plate antenna was further tested by attaching a RFID tag chip and embedded it to the actual vehicle plate number. Initial testing on the field by attached e-plate on vehicle was achieved maximum reading range of up to 12 meters.
Developing Distributed System With Service Resource Oriented Architecture Hermawan, Hermawan; Sarno, Riyanarto
TELKOMNIKA Telecommunication, Computing, Electronics and Control Vol 10, No 2: June 2012
Publisher : Universitas Ahmad Dahlan

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Abstract

Service Oriented Architecture is a design paradigm in software engineering with which a distributed system is built for an enterprise. This paradigm aims at providing the system as a service through a protocol in web service technology, namely Simple Object Access Protocol (SOAP). However, SOA is service level agreements of webservice. For this reason, this reasearch aims at combining SOA with Resource Oriented Architecture in order to expand scalability of services. This combination creates Sevice Resource Oriented Architecture (SROA) with which a distributed system is developed that integrates services within project management software. Following this design, the software is developed according to a framework of Agile Model Driven Development which can reduce complexities of the whole process of software development.
Indoor Localization System based on Artificial Landmarks and Monocular Vision G. Pinto, Andry Maykol; Moreira, A. Paulo; G. Costa, Paulo
TELKOMNIKA Telecommunication, Computing, Electronics and Control Vol 10, No 4: December 2012
Publisher : Universitas Ahmad Dahlan

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Abstract

This paper presents a visual localization approach well suited for the domestic and industrial environments due to its ability to provide an accurate, reliable and robust pose estimation.The mobile robot is equipped with a single camera to update their pose whenever a landmark is available on the field of view.The innovation presented by this research focus, especially, on the artificial landmark that has the ability to detect the presence of the robot, sinceboth entities communicates with each other using an infrared signal protocol modulated in frequency. Besides this communication ability, each landmark has several high intensity light-emitting diodes (leds) that shine only for some instances according with the communication, which enables a synchronization between the camera shutter and the blinking of leds. This synchronization increases the system tolerance concerning to the changes in brightness of the ambient lights over time, independently of the landmarks location. The environmentÂ’s ceiling is populated with theselandmarks and an Extended Kalman Filter is usedto combine the dead-reckoning and landmark information. This increases the flexibility of the system by reducing the number of landmarks needed. The experimental evaluation of the proposed system was conducted in a real indoor environment with an autonomous wheelchair prototype.
Comparison of Predictive Models for Photovoltaic Module Performance under Sudanese-Sahelian Climate Simon, Koumi Ngoh; Donatien, Njomo; Nfetoum I, Mougnutou
TELKOMNIKA Telecommunication, Computing, Electronics and Control Vol 10, No 2: June 2012
Publisher : Universitas Ahmad Dahlan

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Abstract

This paper investigates various approaches to the modeling of photovoltaic systems and tests their accuracy under tropical climate. Particularly the single diode model is used to estimate the electrical behavior of the cell with respect changes on environmental parameter of temperature and irradiance. A particular typical MXS60 solar panel is used for models evaluation and results are comparing with points taken directly from the experience made on the same panel in tropical climate of the Sudan type . The accuracy of models was computed and the better model was determined for local conditions. The analysis of the curves shows that the single diode model has the better accuracy whereas the Photovoltaic geographical information system (PVGIS) approach seems to be not appropriate for the region.
An Approach to Minimising Estimated Pincushion Camera Distortions Olufemi Ayinde, Folorunso; Sunar, Mohd Shahrizal; Adebanjo, Adekiigbe; Olukayode, Obasan
TELKOMNIKA Telecommunication, Computing, Electronics and Control Vol 9, No 3: December 2011
Publisher : Universitas Ahmad Dahlan

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Abstract

Minimizing camera distortion has been a focus of recent photorealism researches. Of the several types of camera distortions, researchers concentrated on the radial distortion being the most severe part of the total lens aberrations. Often, polynomial approximations by introducing distortion-specific parameters into the camera model have been methods of evaluating distortions. Of the two types of radial distortions, barrel, is the most discussed probably because of its dominance in cheap wide-angle lenses. In this paper, an approach to estimating and minimizing pincushion distortion by using fundamental surface area properties of the distorted image is proposed. This paper is significant as it reveals the importance of the topic and its implications on the camera. Demonstrations using four camera lenses show the robustness of this technique under different focal lengths conditions. The reliability of the approach is justified by comparing the results with the physical observations using (two tailed) t-test statistic.

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