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TELKOMNIKA Indonesian Journal of Electrical Engineering
ISSN : 23024046     EISSN : 2087278X     DOI : -
TELKOMNIKA Indonesian Journal of Electrical Engineering (ISSN: 2302-4046, e-ISSN: 2087-278X, a Ei Compendex Indexed journal) is a monthly peer reviewed International Journal in English. The aim of this journal is to publish high-quality articles dedicated to all aspects of the latest outstanding developments in the field of electrical engineering. Its scope encompasses the applications of Telecommunication and Information Technology, Applied Computing and Computer, Instrumentation and Control, Electrical (Power), and Electronics Engineering.
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Articles 102 Documents
Search results for , issue " Vol 12, No 4: April 2014" : 102 Documents clear
Joint Optimization of Sensing Time and Fusion Rules for Cognitive Radios Liu, Yang; Cui, Ying; Li, Ou
TELKOMNIKA Indonesian Journal of Electrical Engineering Vol 12, No 4: April 2014
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/telkomnika.v12i4.4793

Abstract

 In Cognitive Radios, sensing-time and fusion rules affect the performance of spectrum sensing when cooperative sensing is applied. Besides, the more unlicensed users are involved in cooperative sensing, the higher spectrum utilization the channel can achieve, while from the unlicensed users’ perspective, the lower average throughput the unlicensed users can obtain. In this paper, we explore the issue on the sensing-time and the fusion rules to optimize the average throughput of the unlicensed users under the constraint that the licensed users are sufficiently protected. At first, we formulate this issue as an optimization problem, and showed the unimodal characteristics of the unlicensed users’ average throughput as a function of the sensing-time and the fusion parameter. Then a numerical optimization algorithm is proposed to obtain the optimal solution. At last, by theoretical analysis and performance comparisons we derived the optimal fusion rule selection scheme under different scenarios. Computer simulations show that significant improvement in the average throughput of unlicensed users is achieved when the sensing-time and the fusion rule are jointly optimized.
Research on Design Method Based on Hardware Encryption and Two-way ID Authentication for Security Mobile Hard Disk Yang, Huanchun
TELKOMNIKA Indonesian Journal of Electrical Engineering Vol 12, No 4: April 2014
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/telkomnika.v12i4.4995

Abstract

The design Method of the " Security Mobile Hard Disk Based on Hardware Encryption and Two-way ID Authentication" adopts the smart card-based technology of two way ID authentication, thus enables higher authentication strength than ordinary password authentication and USB-KEY one way certification; adoption of dedicated hardware encryption chip on encrypting the hard disk data enhances the encryption speed; since this encryption is a hardware level encryption, it is completely transparent to users, and do not rely on the operating system or other applications, with almost no impact on system performance; that the key of the encryption system will be loaded before the system initialization (system boot) prevents malicious code attacks from hard drive, and even when the mobile hard disk was stolen, the thief cannot read out any encrypted data from it  on any other computer as long as the thief has no access to the encryption key. Therefore, this "encrypted mobile hard disk" is more secure with better reading and writing performance, and thus can effectively protect Important and sensitive data on the mobile hard disk.
The Approach of Error Calibration for Three-axis Magnetic Heading Sensor Xiao, Miaoxin
TELKOMNIKA Indonesian Journal of Electrical Engineering Vol 12, No 4: April 2014
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/telkomnika.v12i4.4837

Abstract

The accuracy of magnetic heading sensor is reduced by the impact of manufacturing technology and local magnetic interferences. The singularity of constraint matrix in traditional calibration algorithm leads to unstable results. Therefore, an improved least-square ellipsoid fitting method is proposed in this paper. The error source and the deviation mathematical model are introduced. On the basis of the analysis on singularity of the constraints matrix, parameter extraction by the improved least-square ellipsoid fitting method is given. The new method successfully overcomes the instability of the traditional algorithm, and reduces the computation load. Simulation and experimental results show that this method is effective in calibrating magnetic heading sensor. The heading precision of the sensor acquired after calibration is better than 0.42º
PMSM Control Simulation Based on Pumping Unit Zhang, Zikuan; He, Lin
TELKOMNIKA Indonesian Journal of Electrical Engineering Vol 12, No 4: April 2014
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/telkomnika.v12i4.4836

Abstract

To study direct drive pumping unit of operating state, permanent magnet synchronous motor open-loop control system was used to model and simulate based on Matlab/Simulink software, and analyzed the waveforms change with different torque. The results indicate that permanent magnet synchronous motor can operate smoothly under low speed and high torque condition, and can meet work requirement of direct drive pumping unit with acceleration. The proposed Simulink simulation system can achieve stable control in actual operation, and its effectiveness was confirmed experimentally. Results of simulation analysis have some certain practical value for pumping unit driven by permanent magnet synchronous motor.
Research and Design of Nuclear Fuel Manipulate Crane ControlSystem Mu, Zhaohui; Liu, Rao; Li, Weidong
TELKOMNIKA Indonesian Journal of Electrical Engineering Vol 12, No 4: April 2014
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/telkomnika.v12i4.4835

Abstract

In order to solve the disadvantages of the Nuclear Fuel Manipulate Crane (ab. MC), the control system of MC is researched and designed, which is based on the operation experiences about Nuclear Fuel Transtion and Storage System (ab.PMC) in Daya Bay and Ling’ao Nuclear Power Plant.The new control system adopts single failure principle and makes use of the Device-net technology that is diffusely applied and extraordinary tried in practice. There are two Device-nets and one Ethernet, the two kinds of nets are combined.Applying the new technologies and new equipments, the new control system solves the defects which Ethernet and a single set of PLC don’t satisfy single failure principle, improves the safety and whole performance of MC loading and unloading of nuclear fuel assembly, and makes control system simply to wire. According to the design of the new control system, the product of MC has been successfully applied to Educate Center in Daya Bay Nuclear Power Site and FangchenggangNuclear Power Plant, and the result is obvious.
Comparision of Several Preprocessing Algorithms based on Near Infrared Spectroscopic Measurement of Glucose in Aqueous Glucose Solutions Zhang, Yan; Deng, Yawen; Sun, Jinwei; Yang, Chunling; Zhang, Guoliang; Liu, Dan
TELKOMNIKA Indonesian Journal of Electrical Engineering Vol 12, No 4: April 2014
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/telkomnika.v12i4.4060

Abstract

Glucose concentration measurement is the basis of noninvasive detection of blood glucose concentration. It is significant in scientific research. In this study, Near Infrared Spectrum (NIRS) and regression analysis methodology were combined to measure the glucose concentration. The spectrum of glucose solutions was obtained with the Fourier Transformed Infrared Spectrometer, and then the data was used for regression analysis. In addition, the method of Paritial Least Squares (PLS) was used to achieve principle components and various spectral preprocessing methods were discussed. During PLS modeling, the Savitzky-Golay could improve the Prediction Residual Error Sum of Squares (PRESS) within 6%. The experiment results demonstrate that NIRS has the potential for the measurement of glucose solution.
Gasoline Engine Fuel Pump Pressure Nonlinear Function Fuzzy Control XU, Junyan; BO, Jianrong; WU, Zhuangwen
TELKOMNIKA Indonesian Journal of Electrical Engineering Vol 12, No 4: April 2014
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/telkomnika.v12i4.4220

Abstract

In order to improve the accuracy of electronic fuel injection (EFI) engine fuel pump pressure, according to the characteristics of pump directly driven by motor, a nonlinear mathematical model is built for the fuel supply system of EFI engine pressure control. And then, the nonlinear-function-optimized flow signal is introduced to adjust the parameters of nonlinear function. With the PI control algorithm, the precise tracking control of injection pressure is achieved. The simulation and experiment results show that, it can indirectly realize from the speed control to pressure control.
Robust Adaptive Fuzzy Sliding Mode Control Based on Fuzzy Compensation for Ammunition Auto-loading Robot Li, Yufeng; Li, Kuiwu; Pan, Yutian; Li, Kelei
TELKOMNIKA Indonesian Journal of Electrical Engineering Vol 12, No 4: April 2014
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/telkomnika.v12i4.4342

Abstract

Aimed at the problems of low control accuracy and weak robustness influenced by external disturbance, friction, load changes, modeling errors and other issues in ammunition auto-loading robot control system, a new robust adaptive fuzzy sliding mode controller based on fuzzy compensation is proposed. The control architecture employs fuzzy systems to compensate adaptively for plant uncertainties to distinguish different disturbance compensation terms and approximate each of them respectively. The stability of the robust adaptive fuzzy sliding mode control (SMC) and the convergence of the tracking errors are ensured by using the Lyapunov theory. By analyzing and comparing the simulation results, it is obviously shown that the control system can lighten the effect on the control system caused by different disturbance factors and eliminate the system chattering instead of traditional SMC. As a result, the control system has great dynamic features and robust stability and meets the requirement that the actual motion of ammunition auto-loading robot quickly tracks the scheduled trajectory.
Trilayer Graphene Nanoribbon Field Effect Transistor Analytical Model Rahmani, Meisam; Ismail, Razali; Ahmadi, Mohammad Taghi; Rahmani, Komeil; Pourasl, Ali H.
TELKOMNIKA Indonesian Journal of Electrical Engineering Vol 12, No 4: April 2014
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/telkomnika.v12i4.4698

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.
Analysis on Channel Capacity of Transform Domain Communication System Naiqi, Wei; Zili, Chen; Junwei, Lv; Anshi, Zhu
TELKOMNIKA Indonesian Journal of Electrical Engineering Vol 12, No 4: April 2014
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/telkomnika.v12i4.4112

Abstract

Transform Domain Communication System (TDCS) has caught attention for its characteristics of flexible spectrum application, excellent anti-interference performance and low interception probability. Analysis on channel capacity is one aspect of important basic theory research for TDCS. The fundamental principle of TDCS is studied at first. Then the channel capacity model of TDCS is deduced and built on the background of Gaussian white noise channel with typical interference. The channel capacity of TDCS under different spectrum sensing methods is investigated on the basis of the model. The research indicates that the spectrum sensing methods based on AR model and wavelet-packet transform make more improvement for TDCS channel capacity. Therefore, from the perspective of maximizing TDCS channel capacity, the spectrum sensing methods based on AR model and wavelet-packet transform can be adopted.

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