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INDONESIA
Indonesian Journal of Electrical Engineering and Computer Science
Published by Institute of Advanced Engineering and Science
ISSN : 25024752     EISSN : 25024760     DOI : -
Core Subject :
Arjuna Subject : -
Articles 9,199 Documents
 372   373   374   375   376 
Optimized Suitable Propagation Model for GSM 900 Path Loss Prediction Syahfrizal Tahcfulloh; Eka Riskayadi
Indonesian Journal of Electrical Engineering and Computer Science Vol 14, No 1: April 2015
Publisher : Institute of Advanced Engineering and Science

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Abstract

This paper present how COST-231 Hata model is chosen and optimizedfor path loss prediction in suburban area of Tarakan, Indonesia in the GSM 900 MHz system.Thispredicted and optimized path loss model is based on the empirical measurement collected in the GSM system on Tarakan City. It is developed by comparing the calculatedpath loss from collected measurements with the well-known path loss models within applicable frequency range of GSM system, such as COST-231 Hata, Ericsson, SUI, Walfish, ECC-33, and Lee Model. The COST-231 Hata model was chosen based on the closest and smallest mean error ascompared to the measured path loss. This optimized COST-231 Hata model is implemented in the path loss predictionduring the validation process. Thus, this optimized model is successfully improved and would be more reliableto be applied in the TarakanGSM900 MHz system for path loss prediction. DOI: http://dx.doi.org/10.11591/telkomnika.v14i1.7470 
A Method for Detecting and Blocking Instant Messaging Software Hao Zhang; Guangli Xu; Jiongzhao Yang; Jianmin Li
Indonesian Journal of Electrical Engineering and Computer Science Vol 11, No 10: October 2013
Publisher : Institute of Advanced Engineering and Science

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Abstract

Instant messaging software, as a convenient network communication tool, is becoming more and more popular. At the same time, it also brings risks in security of local area network (LAN). Through studying in typical instant messaging software and detected by the combination of misuse detection and protocol analysis, an architecture of detecting and blocking mechanism of instant messaging software is proposed in this paper and its prototype system is achieved on Windows platform. This new system effectively solves the problems that the efficiency of traditional firewall application layer data filtering is low and the firewall cannot dynamically adjust the filtering rules, providing a good application value for the protection of the security of local area network. DOI: http://dx.doi.org/10.11591/telkomnika.v11i10.3394 
Non-Specific Person Continuous Speech Identification in Second Language using BPR Guangming Xian; Biqing Zeng; Qiaoyun Yun; Xiongwen Pang
Indonesian Journal of Electrical Engineering and Computer Science Vol 10, No 7: November 2012
Publisher : Institute of Advanced Engineering and Science

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Abstract

Second language speech recognition is an important technical means of man-machine communication system. In this paper, we propose a biomimetic pattern recognition (BPR) algorithm for non specific person continuous speech identification in second language. Feature parameters are extracted directly from single number sample being segmented according to Mel cepstral way. BPR-based connected number recognition experiments show that the proposed method with better identification performance in second language than NN neural network and SVM. From non specific person continuous speech recognition experiments, we show that the BPR algorithm greatly improves word recognition accuracy and has good recognition ability without causing poorer performance in second language. DOI: http://dx.doi.org/10.11591/telkomnika.v10i7.1550
Comparative study of three different bridge-less converters for reduction of harmonic distortion in brushless DC motor Santanu Mondal; Madhurima Chattopadhyay
Indonesian Journal of Electrical Engineering and Computer Science Vol 20, No 3: December 2020
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v20.i3.pp1185-1193

Abstract

This paper represents a comparative study of three different types of DC-DC converter that can be used for reduction of total harmonic distortion (THD) in stator current, back electromotive force (EMF) and torque of brush less DC motor. In addition, the topologies of these converters are analysed, and the THD of the output characteristics have also been studied. In this work, SEPIC, Zeta and Flyback converters are considered and their outputs are fed to the BLDCM with the help of universal bridge or six step inverter. Moreover the THD of the output voltages are not only measured for three converters but also reduced by tuning the parameters. At first these three converters are modeled in MATLAB/ Simulink based simulation platform and studied the performance individually and further executed with hardware circuitry. Finally the output parameters from both software simulation and real time hardware are compared for these three converters separately and got satisfactory similar results. Again we studied the performance with these converters in terms of efficiency while fed in the commutation drive circuitry of BLDCM by considering minimum THD. From this comparative simulation results, it has been observed that Zeta converter showed maximum efficiency. Therefore, in real time hardware implementation, the commutation drive circuitry of BLDCM is studied with Zeta converter. With this configuration, a comparatively low THD of stator current, back EMF and electromagnetic torque have been achieved in BLDCM with PID controller.
A New Harmonic Current Forecasting Method for HAPF of Micro-grid LI Sheng-qing; ZENG Huan-yue; LIN Hong-zhi; LI Wei-zhou; XU Wen-xiang
Indonesian Journal of Electrical Engineering and Computer Science Vol 11, No 4: April 2013
Publisher : Institute of Advanced Engineering and Science

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Abstract

There are a lot of power quality problems such as a large number of harmonic, caused by quickly changing diverse types of loads and power resources in micro-grid. This paper proposed a hybrid active power filte (HAPF) harmonic current prediction method based on the hybrid intelligent prediction model of Empirical Mode Decomposition (EMD) and Intrinsic Mode Regression (SVR). This method Combine the EMD method and SVR module, First, the harmonic current is decomposed into every harmonic current using EMD method; Then using different kernel function in SVR module to predict different times harmonic currents at the next time; Finally, the predicted value of each harmonic weighted summation. Simulation results show that, this method can be well to improve the prediction performance. DOI: http://dx.doi.org/10.11591/telkomnika.v11i4.2375
Induction Motors Stator Fault Analysis based on Artificial Intelligence Hussein Taha Hussein; Mohamed Ammar; Mohamed Moustafa Hassan
Indonesian Journal of Electrical Engineering and Computer Science Vol 2, No 1: April 2016
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v2.i1.pp69-78

Abstract

This article presents a method for fault detection and diagnosis of stator inter-turn short circuit in three phase induction machines. The technique is based on the stator current and modelling in the dq frame using an Adaptive Neuro-Fuzzy artificial intelligence approach. The developed fault analysis method is illustrated using MATLAB simulations. The obtained results are promising based on the new fault detection approach.
A chaos-based medical image encryption method Xuehong Wang; Chunling Tu
Indonesian Journal of Electrical Engineering and Computer Science Vol 19, No 3: September 2020
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v19.i3.pp1316-1324

Abstract

The information in the e-health system involves the patient’s privacy which is extremely sensitive. For instance, these information record social security numbers and detailed medical history.  When the breach happens, there are illegal, or disclosure behaviors taken to privacy that should be compromised security. In this paper, the medical digital images are protected by the proposed chaos-based encryption method in the process of transmission and utilization. Then the authentication is granted to patients and telemedicine staffs by the decryption method proposed. The Qi 3-D four wing chaotic system is employed in this method. The proposed method promises the keys with higher complexity and unpredictability than traditional cryptography methods by introducing the chaotic dynamics in the new cryptography. Digital medical images are used to validate the proposed method under the brute and the differential attacks. The pixels of the image are scrambled completely based on cat map and the sub-blocks of the image are diffused in the way that the original image is changed into a chaotic image robust to all kinds of attacks. The experiments show that the proposed method has higher performance and higher computation for decryption.
Impact of Topology and Traffic on Interference and Routing in IEEE 802.11 Wireless Mesh Network Feng Zeng; Lan Yao; higang Chen
Indonesian Journal of Electrical Engineering and Computer Science Vol 10, No 4: August 2012
Publisher : Institute of Advanced Engineering and Science

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Abstract

Due to the share nature of wireless medium, interference is the critic factor for the performance improvement in wireless mesh networks. In this paper, we address topology and traffic has the impact on the interference, and even routing, and the interference consists of two parts. One is topology-related interference. Another is traffic-related interference. In IEEE 802.11 based wireless mesh networks, topology-related interference is come from the hidden nodes, and quantified by the number of hidden nodes. Taking information from CTS frames, traffic-related interference is defined and quantified. With the integration of topology and traffic related interference, an interference-aware routing metric and protocol is proposed. In route selection, the proposed routing protocol selects the route with the least interference as the data transmission path. Simulation results show that the proposed routing protocol outperforms the other two protocols in terms of network throughput and end-to-end delay. DOI: http://dx.doi.org/10.11591/telkomnika.v10i4.870
ABC Based Design of PID Controller for Two Area Load Frequency Control with Nonlinearities M. Elsisi; M. Soliman; M. A. S. Aboelela; W. Mansour
Indonesian Journal of Electrical Engineering and Computer Science Vol 16, No 1: October 2015
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v16.i1.pp58-64

Abstract

This paper presents an application of the Artificial Bee Colony (ABC) to optimize the parameters of Proportional-Integral-Derivative controller (PID) of nonlinear Load Frequency Controller (LFC) for a power system. A two area non reheat thermal system is equipped with PID controller. ABC is employed to search for optimal controller parameters to minimize the time domain objective function. The performance of the proposed technique has been evaluated with the performance of the conventional Ziegler Nichols (ZN) , Genetic Algorithm (GA) and Bacterial Foraging Optimization Algorithm (BFOA) in order to demonstrate the superior efficiency of the proposed ABC in tuning PID controller. By comparison with the conventional technique, GA and BFOA, the effectiveness of the proposed ABC is validated over different operating conditions, and system parameters variations.
The Implementation of S-curve Acceleration and Deceleration Using FPGA Guangyou Yang; Zhijian Ye; Yurong Pan; Zhiyan Ma
Indonesian Journal of Electrical Engineering and Computer Science Vol 11, No 1: January 2013
Publisher : Institute of Advanced Engineering and Science

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Abstract

This paper analyzes the basic principle of S-curve acceleration and deceleration, and presents an implementation method of S-curve control algorithm based on FPGA. The S-curve function module diagram and implementing method of PWM speed adjusting are described in FPGA. The steps of S-curve speed dissociation module and PWM variable frequency speed control are shown in this paper. High Performance and Capacity Mixed HDL Simulation software – ModelSim is used to verify the algorithm Verilog HDL code executed in FPGA. At last, a test experiment utilizing such algorithm mentioned above is carried out on one x-y working stand. There is a good agreement between simulation and experiment. The experimental results indicate that the algorithm is simple and reliable enough to meet different application requirements. DOI: http://dx.doi.org/10.11591/telkomnika.v11i1.1897

Page 374 of 920 | Total Record : 9199

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