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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
 403   404   405   406   407 
Trilayer Graphene Nanoribbon Field Effect Transistor Analytical Model Meisam Rahmani; Razali Ismail; Mohammad Taghi Ahmadi; Komeil Rahmani; Ali H. Pourasl
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 4: April 2014
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The approaching scaling of Field Effect Transistors (FETs) in nanometer scale assures the smaller dimension, low-power consumption, low energy delay production, and high density as well as high speed in processor. Trilayer graphene nanoribbon with different stacking arrangements (ABA and ABC) indicates different electrical properties. Based on this theory, ABA-stacked trilayer graphene nanoribbon application as a field effect transistor channel is investigated in this study. The energy band structure of ABA-stacked trilayer graphene nanoribbon in the presence of a perpendicular electric field using a tight-binding model is presented, and the effect of applied voltage on the curvature of the E-K graph is analytically studied. Moreover, an analytical model of carrier statistics for ABA-stacked trilayer graphene nanoribbon in corporation with a numerical solution is presented and current-voltage characteristic of trilayer graphene nanoribbon FET as a one-dimensional device is explored. In fact, the proposed model can be applied as a useful tool to optimize the nanoscale FET based device performance. DOI : http://dx.doi.org/10.11591/telkomnika.v12i4.4698
Parallel multi-layer selector S-Box based on lorenz chaotic system with FPGA implementation Mohamed Saber; Esam Hagras
Indonesian Journal of Electrical Engineering and Computer Science Vol 19, No 2: August 2020
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v19.i2.pp784-792

Abstract

The substitution box (S-box) is the main block in the encryption system, which replaces the non-encrypted data by dynamic secure and hidden data. S-box can be designed based on complex nonlinear chaotic systems that presented in recent papers as a chaotic S-Box. The hardware implementation of these chaotic systems suffers from long processing time (low speed), and high-power consumption since it requires a large number of non-linear computational models. In this paper, we present a high-speed FPGA implementation of parallel multi-layer selector substitution boxes based on the lorenz chaotic system (PMLS S-Box). The proposed PMLS chaotic S-box is modeled using xilinx system generator (XSG) in 32 bits fixed-point format, and the architecture implemented into Xilinx Spartan-6 X6SLX45 board. The maximum frequency of the proposed PMLS chaotic S-box is 381.764MHz, with dissipates of 77 mwatt. Compared to other S-box chaotic systems, the proposed one achieves a higher frequency and lower power consumption. In addition, the proposed PMLS chaotic S-box is analyzed based on S-box standard tests such as; Bijectivity property, nonlinearity, strict avalanche criterion, differential probability, and bits independent criterion. The five different standard results for the proposed S-box indicate that PMLSC can effectively resist crypto-analysis attacks, and is suitable for secure communications.
Precise Clock Synchronization Algorithm for Distributed Control Systems Yi Liu; Haiying Yang
Indonesian Journal of Electrical Engineering and Computer Science Vol 11, No 7: July 2013
Publisher : Institute of Advanced Engineering and Science

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Abstract

The distributed control systems are applied widely in communication, navigation and power fields. With growing in both systems complexity and speed of data exchange, the real time performance of systems is required. Existing clock synchronization techniques include those for wide-area network (WAN) applications with large propagation delays, e.g., the Network Time Protocol (NTP), and those for control systems over local-area networks (LANs), e.g., the IEEE 1588 Precise Time Protocol (PTP). However, NTP-like protocols have only millisecond-scale precision, which is too coarse for many LAN applications such as instrument monitoring systems, high-quality digital audio systems and sensor networks. The 1588 PTP like protocols, which are still under development, require support of a highly precise hardware clock. The key point of the existing Ethernet test and measurement is that the method needs to achieve precision clock synchronization between different terminals. In this paper, an improved method is proposed with consideration of the time drift and propagation delay, expressing master-slave synchronization as a linear relationship and inducting the line of least squares fitting algorithm that traded as linear matrix form. The precision time protocol (PTP) is also analyzed in this paper. The experiment results show that the synchronization accuracy reaches sub-microsecond grade, which is the same as the PTP. DOI: http://dx.doi.org/10.11591/telkomnika.v11i7.2832
The effect of wavelet transform on OFDM system in modern cellular networks Mayada Faris Ghanim
Indonesian Journal of Electrical Engineering and Computer Science Vol 15, No 1: July 2019
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v15.i1.pp324-327

Abstract

The performance of OFDM (Orthogonal Frequency Division Multiplexing) proved that it was an excellent technique for 4G.It provides good spectrum efficiency and it has excellent throughput in different situations. This technique can be improved to be suitable for 5G systems. Wavelet transform has many advantages that make it suitable and efficient approach to replace Fast Fourier Transform (FFT) in conventional OFDM systems. Wavelet transform is employed in modern cellular networks to remove the use of cyclic prefix, which leads to decreasing the bandwidth losses and the power of transmission. Wavelet based OFDM system is designed in order to overcome the drawbacks of OFDM system so that the proposed system is good candidate for next generation of wireless communications. 
Design of Dual Band Sleeve Dipole Antenna for Mobile Jammer Applications Tariq Rahim; Jiaodong Xu
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.pp106-110

Abstract

A multi band sleeve dipole antenna for jammer application is proposed. The antenna can cover band in which mobile and other wireless devices operate. The design antenna shows very good omni-directional characteristics and scattering parameter S11 value less than -10db. The dipole is made of two concentric hallow cylinder with different radius and different lengths. The antenna is fed at the center with coaxial cable pass through the bottom cylinder and thus avoids the use of complicated balun network. The impedance bandwidth and the radiation pattern are measured and analyzed both at 900 MHz and 1.8 GHz. The antenna can also be used GSM/DCS/WCDMA/CDMA2000/ TD-SCDMA /WLAN applications at both indoor and outdoor platform.
Rectification of Uncalibrated Images for Stereo Vision HAN Huiyan; HAN Xie; Yang Fengbao
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 aims at rectification of uncalibrated stereo images. We use the direct method to compute the rectifying transformations, not to deduce from the fundamental matrix, so to reduce the uncertainty; Minimize the distance from the point to its epipolar line to ensue the uniqueness of the two rectifying transformations. We only extract a few correspondent points, make use of the condition of the correspondent points in the rectified images also meet the polar constraint, minimize distance of all of the correspondent points to the corresponding epipolar line, then obtain the system equations, through solving system of equations, thus get the rectifying transformation matrix and rectify the stereo image pairs. Experiments show that, the size of the rectified images change not so seriously, the vertical disparity is eliminated, so the subsequent stereo correspondence can be fulfilled on the horizontal scan line of the rectified images completely. DOI: http://dx.doi.org/10.11591/telkomnika.v11i1.1903
Operational Modal Analysis of Wind Turbine Speed-increase Gearbox LI Yafeng; XU Yuxiu
Indonesian Journal of Electrical Engineering and Computer Science Vol 11, No 11: November 2013
Publisher : Institute of Advanced Engineering and Science

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Abstract

Speed increase transmission gear box is the primary vibration and noise source of wind turbine, Operational modal method was adopted to collect impact data and response data of each point based on the gearbox test model. ANSYS finite element model is established to simulate the wind turbine gearbox. Then the modal frequencies of the two methods were compared to ensure the test model is correct. The results show that operational modal method can be applied in wind turbine gearbox modal analysis and it has important guiding significance to gearbox fault diagnosis and reliability and maintainability improving. DOI: http://dx.doi.org/10.11591/telkomnika.v11i11.3518 
Liquefied petroleum gas monitoring and leakage detection system using nodemcu ESP8266 and wi-fi technology Suzi Seroja Binti Sarnin; Divine Senanu Ametefe; Nani Fadzlina Naim; Wan Norsyafizan Wan Mohamad; Norlela Ishak; Norfishah Ab Wahab; Norsuzila Ya’acob
Indonesian Journal of Electrical Engineering and Computer Science Vol 17, No 1: January 2020
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v17.i1.pp166-174

Abstract

Liquefied Petroleum Gas which is popularly known as LPG is a clean source of energy which is highly flammable and usually compressed into storage tanks. Due to the flammable nature of LPG it can easily lead to uncontrollable explosions in the presence of any ignition action or may lead to complete depletion of oxygen in a particular area. This study is focused on the fabrication of a system that would detect, monitor and control LPG gas leakages for domestic gas cylinders. A MQ-2 gas sensor was used for the detection of LPG gas leakages, the monitoring aspect was satisfied locally through notifications triggered by LEDs, piezo buzzer and remotely through the use of an application known as Blynk. The control aspect was implemented with the use of a stepper motor which turns off gas cylinder regulators whenever gas concentrations are high. All operations are primary hinged on the NodeMCU ESP8266 controller and Wi-Fi communication technology. 
Controlled Synchronization by Limited Capacity Communication Channel Ziqi Dong; Yongchun Liu; Da Lin
Indonesian Journal of Electrical Engineering and Computer Science Vol 12, No 7: July 2014
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v12.i7.pp5362-5367

Abstract

The work focuses on synchronization of time-delay chaos systems under information constraints. A theoretical analysis for time-delayed system by limited communication channel is provided. By using the Lyapunov-Krasovskii approach, a synchronization condition is first obtained. Encoder of binary coding is designed by this condition, and synchronization error of this systems tends to zero. Finally, analytical conditions are used for synchronization of time-delay chaos systems under information constraints, and simulations verify the validity of obtained result.
Decoding of PDF417 barcode in Identity Authentication Based on LabVIEW Qian Song; Li Liu
Indonesian Journal of Electrical Engineering and Computer Science Vol 11, No 6: June 2013
Publisher : Institute of Advanced Engineering and Science

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Abstract

Two dimensional barcode had widely applied in identity authentication. In this paper, the symbol structure of PDF417 barcode was introduced, and the image processing methods used in PDF417 barcode recognition were researched. A quick and effective method to calculate the width of the unit module in PDF417 barcode was proposed, and a recognition and decoding system of PDF417 barcode based on software development platform of the LabVIEW virtual instrument was designed and implemented. The system could process and analyze the images containing PDF417 barcode collected by camera in real time, and achieve the fast and omnibearing decoding of the barcode. DOI: http://dx.doi.org/10.11591/telkomnika.v11i6.2607

Page 405 of 920 | Total Record : 9199

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