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29,061 Article Results

Corona Detection Using Wide Band Antenna and Time Delay Method

10.12928/telkomnika.v15i4.7233
A.; Kawasan Institusi Penyelidikan, Malaysia A. Raj , S.; Kawasan Institusi Penyelidikan, Malaysia Ishak , M.; Kawasan Institusi Penyelidikan, Malaysia D. M. Amir , B.; Kawasan Institusi Penyelidikan, Malaysia Yogendra , M.; PJX-HM Shah Tower, Malaysia Raffi
IEEE Std 100-2000 defines corona as a luminous discharge due to ionization of the air surrounding a conductor caused by a voltage gradient exceeding a certain critical value. It occurs when the insulating material begins to ionize or conduct due to voltage stress. Corona brings a lot of damages such as corrosion, loss inoverhead transmission lines and electromagnetic interference. Monitoring of corona may reduce the maintenance and replacement cost of electrical equipment. The motivation of this experiment is to calibrate corona detector antennas in the future. The error obtained will determine the efficiency of the antenna to detect and locate potential coronas in electrical equipment in a substation with switchgears or transformers. The operation bandwidth of the antenna is 320MHz to 1.20GHz making it useful to detect and corona. The measurement method of utilizing delay between signals first peak is effective with average 4.76% error with maximum 10.0% error recorded. This may be used to develop a corona online measuring system in the future.
Volume: 15
Issue: 4
Page: 1547-1553
Publish at: 2017-12-01

The Chaos and Stability of Firefly Algorithm Adjacent Individual

10.12928/telkomnika.v15i4.5015
Wen Xin; Hunan University, China Yu , Jun Nian; Hunan University, China Wang , Yan; Hunan University, China Li , Zheng Heng; Hunan University, China Wang
In this paper, in order to overcome the defect of the firefly algorithm, for example, the slow convergence rate, low accuracy and easily falling into the local optima in the global optimization search, we propose a dynamic population firefly algorithm based on chaos. The stability between the fireflies is proved, and the similar chaotic phenomenon in firefly algorithm can be simulated.
Volume: 15
Issue: 4
Page: 1733-1740
Publish at: 2017-12-01

Shunt Active Power Filter based on P-Q Theory with Multilevel Inverters for Harmonic Current Compensation

10.12928/telkomnika.v15i4.6363
Suhendar; University of Sultan Ageng Tirtayasa, Indonesia Suhendar , Teguh; University of Sultan Ageng Tirtayasa, Indonesia Firmansyah , Alief; University of Sultan Ageng Tirtayasa, Indonesia Maulana , Zuldiag; University of Sultan Ageng Tirtayasa, Indonesia Zuldiag , Vektor; Bogor Agricultural University, Indonesia Dewanto
A shunt active power filter based on P-Q theory combined with high pass filters (HPFs) for harmonic-current compensation was proposed in this paper. A dual level H-bridge inverter (DLHI) and clamp diode multilevel inverter (CDMI) as inverters was used. The proposed active power filter was applied to 3-phase power system with 220V voltage and 50Hz frequency. the simulation model was constructed by using Simulink MATLAB. The results show that the proposed active power filter with CDMI produces lower total harmonic distortion (THD) than the active power filters with DLHI. Additionally, the proposed shunt active power filter has lower THD compared with other types of active power filters.
Volume: 15
Issue: 4
Page: 1632-1640
Publish at: 2017-12-01

Customers’ Perception Towards Services of Telecommunications Operators

10.11591/ijict.v6i3.pp146-154
Driss Ait Omar , Mohamed Baslam , Mourad Nachaoui , And Mohamed Fakir
Currently the operators in the telecommunications market present offers of subscription to the consumers,and given that competition is strong in this area, most of these advertising offers are prepared to attract and / or keep customers.For this reason, customers face problems in choosing operators that meet their needs in terms of price, quality of service (QoS), etc..., while taking into account the margin between what is advertising and what is real. Therefore, we are led to solve a problem of decision support. Mathematical modeling of this problem led to the solution of an inverse problem. Specifi-cally, the inverse problem is to find the real Quality of Service (QoS) function knowing the theoretical QoS. To solve this problem we have reformulated in an optimization problem of minimizing the difference between the real quality of service (QoS) and theoretical (QoS). This model will help customers who seek to know the degree of sincerity of Their operators, as well as it is an opportunity for operators who want to maintain their resources so that they gain the trust of customers. The resulting optimization problem is solved using evolutionary algorithms. The numerical results showed the reliability and credibility of our inverse model and the performance and effectiveness of our approach.
Volume: 6
Issue: 3
Page: 146-154
Publish at: 2017-12-01

Wireless Fault Detection System for an Industrial Robot Based on Statistical Control Chart

10.11591/ijece.v7i6.pp3421-3435
Alaa Abdulhady Jaber , Robert Bicker
Industrial robots are now commonly used in production systems to improve productivity, quality and safety in manufacturing processes. Recent developments involve using robots cooperatively with production line operatives. Regardless of application, there are significant implications for operator safety in the event of a robot malfunction or failure, and the consequent downtime has a significant impact on productivity in manufacturing. Machine healthy monitoring is a type of maintenance inspection technique by which an operational asset is monitored and the data obtained is analysed to detect signs of degradation and thus reducing the maintenance costs. Developments in electronics and computing have opened new horizons in the area of condition monitoring. The aim of using wireless electronic systems is to allow data analysis to be carried out locally at field level and transmitting the results wirelessly to the base station, which as a result will help to overcome the need for wiring and provides an easy and cost-effective sensing technique to detect faults in machines. So, the main focuses of this research is to develop an online and wireless fault detection system for an industrial robot based on statistical control chart approach. An experimental investigation was accomplished using the PUMA 560 robot and vibration signal capturing was adopted, as it responds immediately to manifest itself if any change is appeared in the monitored machine, to extract features related to the robot health conditions. The results indicate the successful detection of faults at the early stages using the key extracted parameters.
Volume: 7
Issue: 6
Page: 3421-3435
Publish at: 2017-12-01

Design and Development of a Shortwave near Infrared Spectroscopy using NIR LEDs and Regression Model

10.11591/ijece.v7i6.pp3070-3075
Kim Seng Chia , Yit Peng Tan
Near infrared (NIR) spectroscopic technology has been getting more attention in various fields. The development of a low cost NIR spectroscopy is crucial to reduce the financial barriers so that more NIR spectroscopic applications will be investigated and developed by means of the NIR spectroscopic technology. This study proposes an alternative to measure shortwave NIR spectrum using one collimating lens, two slits, one NIR transmission grating, one linear array sensor, and one microcontroller. Five high precision narrow bands NIR light emitting diodes (LEDs) were used to calibrate the proposed spectroscopy. The effects of the proposed two slits design, the distance between the grating and linear array sensor, and three different regression models were investigated. The accuracy of the proposed design was cross-validated using leave-one-out cross-validation. Results show that the proposed two slits design was able to eliminate unwanted signals substantially, and the cross-validation was able to estimate the best model with root mean squared error of cross-validation of 3.8932nm. Findings indicate that the cross-validation approach is a good approach to estimate the final model without over-fitting, and the proposed shortwave NIR spectroscopy was able to estimate the peak value of the acquired spectrum from NIR LEDs with RMSE of 1.1616nm.
Volume: 7
Issue: 6
Page: 3070-3075
Publish at: 2017-12-01

Influences of Buffer Size and Eb/No on Very Small Aperture Terminal (VSAT) Communictions

10.12928/telkomnika.v15i4.5788
Debby Maureen; Bogor Agricultural University, Indonesia Talumewo , Heru; Bogor Agricultural University, Indonesia Sukoco , Fahren; Bogor Agricultural University, Indonesia Bukhari
In data communication of the signal transmitted from the transmitter (Tx) to receiver (Rx) stations is very influential. Buffer and Eb/No are two parameters that influence the quality of signal. This research measures those parameters and the relationship among them. This research employs data collected on the Link STM-1 side in Makassar and Timika operated by PT. Telkom Metra Bogor. The period of data is carried out for 56 days taken by using Simple Management Network Protocol (SNMP). To analyze the relationship among those two parameters, we use product moment correlation (PMC) method. The result correlation of the data buffer and Eb/No with a level of real is 0.05 and then buffer set in modem CDM 700 is 50% with threshold Eb/No 12.1 dB and the modulations used 64-QAM. That resulted correlation of side in Makassar is 0.648 and the p-value is 0.000. Correlation of side in Timika is 0.722 and the p-value is 0.000. These results suggest that the two parameters are correlated strong and significant. 
Volume: 15
Issue: 4
Page: 1990-1996
Publish at: 2017-12-01

Coordination of SPS and CES to Mitigate Oscillatory Condition on Power Systems

10.12928/telkomnika.v15i4.6636
Rahmat Septian; Universitas Pertamina, Indonesia Wijanarko , Herlambang; The University of Queensland, Australia Setiadi , Teguh Aryo; Universitas Pertamina, Indonesia Nugroho
Oscillatory condition on power system (low-frequency oscillation) is one of the important factors to determine the quality of the power system. With the increasing number of load demand, this condition is getting worse in recent years. Hence, utilizing addition devices to maintain and mitigate the oscillatory condition of power system is crucial. This paper proposed a method to mitigate power system oscillation by installing one of the flexible AC transmission system (FACTS) devices called solid phase shifter (SPS) and energy storage devices called capacitor energy storage (CES). To analyze the performance of power system with SPS and CES, the eigenvalue and damping ratio analysis are used. Time domain simulation is also investigated to analyze the dynamic behaviors of power system considering SPS and CES. Furthermore, increasing number of load demand is carried out to analyze how much load can be increased without increasing power to the grid. From the simulation, it is found that SPS and CES can mitigate low-frequency oscillation on power system indicated by highest damping, smallest overshoot, and fastest settling time. It is also found that load demand can be increased significantly when SPS and CES installed to the system.
Volume: 15
Issue: 4
Page: 1601-1609
Publish at: 2017-12-01

RTL Modelling for the Cipher Blcok Chaining Mode (Cbc) for Data Security

10.11591/ijeecs.v8.i3.pp709-711
Meenakshi R. K , A. Arivazhagan
The demand of satellite communication, the security algorithms are to be designed in the board. The information from the satellite to the ground is required the data security with the cryptographic algorithms. Advanced encryption standard (AES) is one of the promising cryptographic algorithms for the terrestrial communication. In this paper, the encryption and decryption is mainly focused on the cipher block chaining (CBC) mode for achieving the high secured data transmission. For efficient data transmission, the AES algorithm is implemented by using CBC mode. The proposed work is designed by using RTL modeling and also the minimum numbers of logical elements are used for implementation. 
Volume: 8
Issue: 3
Page: 709-711
Publish at: 2017-12-01

Design of Compact Monopole Antenna using Double U-DMS Resonators for WLAN, LTE, and WiMAX Applications

10.12928/telkomnika.v15i4.7666
Ahmed; German Research Foundation (DFG) Boutejdar , Mohammad Ahmad; University of Palestina Salamin , Saad Dosse; Université Sidi Mohamed ben Abdellah Bennani , Soumia; Mohammed V University El Hani
This paper is under in-depth investigation due to suspicion of possible plagiarism on a high similarity indexIn this research, a novel wide-band microstrip antenna for wideband applications is proposed. The proposed antenna consists of a square radiating patch and a partial ground plane with a smal rectangular notch-shape. Two symmetrical U-slots are etched in radiating patch. The defected microstrip U-shapes and the small notch improve the antenna characterestics such impedance wideband and the gain along the transmission area. The proposed antenna is simulated on an FR4 substrate of a dielectric constant of 4.3, thickness 1.6 mm, permittivity 4.4, and loss tangent 0.018. The simulation and optimization results are carried out using CST software.The antenna topology occupies an area of 30 × 40 × 0.8 mm3 or about 0.629λg × 0.839λg × 0.017λg at 3 GHz (the centerresonance frequency). The antenna covers the range of 2.1711 to 4.0531 GHz, which meet the requirements of the wireless local area network (WLAN), worldwide interoperability for microwave access (WiMAX) and LTE (Long Term Evolution) band applications. Good VSWR, return loss and radiation pattern characteristics are obtained in the frequency band of interest. The obtained Simulation results for this antenna depict that it exhibits good radiation behavior within the transmission frequency range.
Volume: 15
Issue: 4
Page: 1693-1700
Publish at: 2017-12-01

Survey of ICT knowledge based Agriculture Development System

10.11591/ijeecs.v8.i3.pp681-683
H J. Shanthi
E-agriculture gives to applying new things to use ICTs in the country, with the main heart on agricultural. ICT in Agriculture provides a wide range of solutions to some farming ideas. The rising field focuses on the development of agricultural and rural advance through improved information and communication. This time, ICT is used as around all information and communication developments including Android mobiles, IOT devices, communication networking devices,  web services; this variety from original Internet-era technologies and sensors to other pre-accessible aids such as  TV, satellites, and radios. This technique continues to evolve in scope as new ICT applications continue to be harnessed in the agriculture industries. It involves the concept, development, design, application, and evaluation of novel ways to use ICTs in the rural domain, with the main focus on cultivation. This includes principles, norms, methods, and apparatus as well as the growth of personality and institutional capacity, and policy hold is all key mechanism of e-agriculture.
Volume: 8
Issue: 3
Page: 681-683
Publish at: 2017-12-01

Important Parameters for Hand Function Assessment of Stroke Patients

10.12928/telkomnika.v15i4.7228
H.; Universiti Tun Hussein Onn Malaysia Abdul Rahman , C.; Universiti Teknologi Malaysia F. Yeong , K.; Universiti Teknologi Malaysia X. Khor , E.; Universiti Teknologi Malaysia L.M. Su
Clinical scales such as Fugl-Meyer Assessment and Motor Assessment Scale are widely used to evaluate stroke patient's motor performance. However, the scoring systems of these assessments provide only rough estimation, making it difficult to objectively quantify impairment and disability or even rehabilitation progress throughout their rehabilitation period. In contrast, robot-based assessments are objective, repeatable, and could potentially reduce the assessment time. However, robot-based assessment scales are not as well established as conventional assessment scale and the correlation to conventional assessment scale is unclear. This paper discusses the important parameters in order to assess the hand function of stroke patients. This knowledge will provide a contribution to the development of a new robot-based assessment device effectively by including the important parameters in the device. The important parameters were included in development of iRest and yielded promising results that illustrate the potential of the important parameters in assessing the hand function of stroke patients.
Volume: 15
Issue: 4
Page: 1501-1511
Publish at: 2017-12-01

Intelligent Image Capturing Alarm System Using Raspberry Pi

10.12928/telkomnika.v15i4.6532
K.A.M.; Universiti Teknikal Malaysia Melaka, Malaysia Annuar , N.A.; Universiti Teknikal Malaysia Melaka, Malaysia Ab Hadi , S.K.; Universiti Teknikal Malaysia Melaka, Malaysia Subramaniam , M. F. Mohd Ab; Universiti Teknikal Malaysia Melaka, Malaysia Halim , M.B.; Universiti Teknikal Malaysia Melaka, Malaysia N. Shah , A.F.; Universiti Teknikal Malaysia Melaka, Malaysia Kadmin , M.S.; Universiti Teknikal Malaysia Melaka, Malaysia Amri , A.; Universiti Kuala Lumpur-British Malaysian Institute, Malaysia Abdul Salam
Home surveillance system assumes an essential part in this present day living style to help recognizing illegal activities. In this proposed paper, an intelligent image capturing alarm system to protect locker was developed. Raspberry Pi 2 is used as the main controller (server). At the point when any conceivable intrusion is identified, a webcam installed to Raspberry Pi 2 will capture the picture of the intruder. In the meantime, the spotlight or light of the house which represented by an LED will be turned "ON" alongside an alarm sound from a buzzer which is fixed as an output. Taking everything into account, this improvement offers reasonable and easy to use surveillance alarm system.
Volume: 15
Issue: 4
Page: 1651-1658
Publish at: 2017-12-01

A Novel Single Source Multiple Output Converter Integrating Buck-Boost and Fly Back Yopology for SMPS Applications

10.11591/ijeecs.v8.i3.pp733-736
A. Kalirasu
This paper presents a novel single DC input source and multiple DC output suitable for switched mode power supply (SMPS) applications integrating interleaved boost and sepic converter with fly back topology. The proposed converter can be remodeled for any required output voltage power supply without changing hardware structure because wide range of output voltage can be obtained using sepic and boost converters by changing duty cycle command by implementing a simple voltage input pi controller. Conventional fly back topology is added to interleaved circuit to produce desired dc output voltage this voltage can be controlled by choosing turns ratio of fly back transformer. The proposed multi output DC converter is simulated in MATLAB/Simulink environment and results are presented for verifying merits of the converter.
Volume: 8
Issue: 3
Page: 733-736
Publish at: 2017-12-01

Adjustment Delay Scheme to Improve Performance IEEE 802.15.4 Networks

10.12928/telkomnika.v15i4.6092
Eppy; Universitas Negeri Surabaya, Indonesia Yundra , Bih-Hwang; National Taiwan University of Science and Technology, Taiwan Lee
The challenges of CSMA/CA as following: first, when the device nodes detect the channel in busy condition, the device nodes have to increase the value of backoff exponent which cause range of blind backoff process also increase. Second, the blind backoff process will cause lower channel utilization and more energy consumptions. This article proposes a scheme to improve IEEE 802.15.4 medium access control, called adjustment delay scheme (ADES). This article also presents a comprehensive Markov chain analysis to predict the probability of successful transmission, network goodput, bandwidth utilization and total network energy consumption. The validity of the model analysis is proven by precisely matching the simulation experiments. ADES performs better than those of other algorithms in term of the probability of successful packet transmission, network goodput, bandwidth utilization as well as energy consumption in the networks.
Volume: 15
Issue: 4
Page: 1710-1722
Publish at: 2017-12-01
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