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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 85 Documents
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Search results for , issue "Vol 11, No 7: July 2013" : 85 Documents clear
The NC Power Supply Design of Large Current and Wide Frequency Pulse in SEAM Jianping Zhou; Yan Xu; Qiang He; Bisheng Zhou
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

There are a lot of ways to achieve large current pulse power supply, and the more common way is to adopt the inverter switching circuit to achieve pulse power supply. The core of the NC power supply design of large current and wide frequency pulse in SEAM is using two-stage modulation. Combined with inverter technology, DC chopper technology and NC technology, it not only can achieve the adjustability of the output pulse amplitude, but also can realize continuous adjustment of the output pulses and the duty cycle. The front stage of power supply uses DC/DC transformation circuit with the UC3879 integrated control chip as the core. With the microcontroller as the control core, the backward stage uses DC chopper circuit to achieve the NC power supply of multi-parameter adjustable output large current pulse.DOI: http://dx.doi.org/10.11591/telkomnika.v11i7.2812
A General Threshold Signature and Authenticated Encryption Scheme Based on ElGamal System Yulian Shang; Wuyuan Jia; Lanhua Zhang; Yufei Zhang
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

Based on ElGamal system, a group-oriented threshold signature and authenticated encryption scheme was put forward. After being signed by a signer group employing threshold signature scheme, the message was transmitted to a particular verifier group, and then the signature was verified through the cooperation of  ones from the verifier group with  members. Similarly, a general authenticated encryption scheme characterized by joint verification was put forward through integrating threshold signature scheme and message recovery technique together; After being encrypted singed by any  ones from a group with  members, the message was transmitted to a particular verifier group with members, and then recovered through the cooperation of any ones from the verifier group. The security of this scheme is based on Shamir threshold scheme and ElGamal system. It realized the directional transmission of message between different groups and enjoyed the characteristics of reduced communication load and lowered calculation complexity, etc. DOI: http://dx.doi.org/10.11591/telkomnika.v11i7.2828
Site Selection of Mechanical Parking System Based on GIS with AFRARBMI Tang Minan; Wang Xiaoming; Yuan Shuang
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

In order to rationalize the site-selection of urban mechanical parking system and relieve the traffic congestion after its completion, this paper proposes a decision method. the attribute data of the site-selection of urban mechanical parking system is established on the basis of the GIS analysis method. Then the relationship between the site-selection and multiple geographical factors are explored by the algorithm for mutual information fuzzy-rough attribute reduction and the Rough Set theory. Finally, the attribute reduction is carried out; thereby, an inductive learning method combined with GIS analysis and deductive reasoning is used to generate the decision trees and decision rules and conduct evaluation and analysis for the site-selection decision. Modeling and simulation for the site-selection of mechanical parking system are put into practice in Lanzhou City. The simulation results show that this method can solve the problem better. It also provides reference for the intelligent transportation system. DOI: http://dx.doi.org/10.11591/telkomnika.v11i7.2843
A Semi-Instantaneous Heat Exchanger for Mobile Solar Collectors Test System Haifeng Cao; Liangen Yang; Jiabao Cheng; Xing Cheng
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

A semi-instantaneous heat exchanger which can solve low efficiency and space shortage of mobil test system for thermal performance of solar collectors is proposed in this paper, In this paper, the structure parameters of heat exchanger and the power of heat resistance are designed based on the method of mean temperature difference. The experiment results show the performance of test system has been optimized. The efficiency of collectors test can be increased 50% and the total weight of the primary heater and working medium is reduced to 13.8%.The load of the test vehicle and occupancy volume have been decreased. DOI: http://dx.doi.org/10.11591/telkomnika.v11i7.2860
Backstepping decentralized fault tolerant control for reconfigurable modular robots Jinbao He; Xinhua Yi; Zaifei Luo; Guojun Li
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

For the actuators fault of reconfigurable modular robots, a backstepping decentralized fault tolerant control(DFTC) algorithm is proposed. The reconfigurable robot system is diviedinto a set of interconnected subsystems. The fault tolerant controller is designed based on backstepping method.DOI: http://dx.doi.org/10.11591/telkomnika.v11i7.2583
Dutycycle Influence on the Progenitor Properties of Millisecond Pulsars WeiMin Liu
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

Using a stellar evolutionary code, we carried out the investigation on the progenitor properties of millisecond pulsars with a varying dutycycle parameter. Our simulation results show that dutycycle play an important role on the final spin-period. The final spin-period for d = 0.001 and d = 0.1 is 4.75 ms, 1.49 ms respectively. For the same initial donor star mass and initial orbital period, the mass transfer evolutionary track indeed exists difference although the curve is quite similar. For other values of initial donor mass and initial orbital period, we find that the whole varying trend is consistent with each other. DOI: http://dx.doi.org/10.11591/telkomnika.v11i7.2806
Multi-Machine Controller Design of Permanent Magnet Wind Generators using Hamiltonian Energy Method Bing Wang; Yanping Qian; Honghua Wang Wang
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

In this paper, the nonlinear control problem of permanent magnet wind generators is investigated based on Hamiltonian energy method. A nonlinear design method is proposed for the multi-machine system, such that the closed-loop system is stable simultaneously. Moreover, in the presence of disturbances, the closed-loop is finite–gain L2stable under the action of the Hamiltonian controller. In order to illustrate the effectiveness of the proposed method, the simulations are performed which show that the gotten controller can improve the transient property and robustness of the system. DOI: http://dx.doi.org/10.11591/telkomnika.v11i7.2824
Repetitive Control in the Applications of H-Bridge Active Power Filter Yang Liu; Guojun Tan
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

In order to improve the deficiency of the traditional repetitive control, a novel control method combining dead beat control and repetitive control in series is proposed to improve the dynamic performance of the control system. A low-pass filter on the delay link of repetitive control is added to solve the contradiction between repetitive control stability and steady-state accuracy, while the compensation link is designed with the combination of leading phase and the low-pass filter to reduce the control object by relying on accurate mathematical model. The control method, on the basis of steady state accuracy, improves the relative speed and compensation accuracy. The feasibility of the proposed method is verified by the experimental design. DOI: http://dx.doi.org/10.11591/telkomnika.v11i7.2838
Analysis of Influence Factors of the Old Industrial Area Industrial Structure Optimization and Model Building Huang Qing; Qi Ershi; Shen Jiang
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 old industrial area in the years of development remain some problems to be solved at the same time, combined with years of accumulation of environmental problems is very outstanding, leading to the sustainable development ability is weak, etc. Therefore, optimize the industrial structure of the old industrial area is necessary. This chapter through the analysis of the influencing factors of the old industrial area industrial structure optimization, so as to refine out key factors, and Shangjie District industrial structure optimization as an example to expand research on the optimization of the industrial structure, and construct industrial structure optimization model by stochastic programming method, in order to provide guidance for choosing the subsequent path of the industrial structure, it has important practical significance for promoting industrial structure of Shangjie District become more rational. DOI: http://dx.doi.org/10.11591/telkomnika.v11i7.2855 
DWT Domain Information Hiding Approach Using Detail Sub-band Feature Adjustment Qiudong Sun; Ping Guan; Yongping Qiu; Wenying Yan
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

In recent years, many algorithms based on HVS and DWT had been proposed for watermarking. But most of them aimed at the binary iconic watermark. So they are unsuitable for embedding other format watermarks such as the text file, the gray image or even the color image. This paper proposed a multi-format data source file supporting algorithm for watermarking and information hiding. Firstly, the algorithm transformed a source file into a binary watermark sequence and put redundant encoding and random scrambling on it. Then, the algorithm selected two neighboring blocks each time from the Hilbert scanning sequence of the host image blocks, and transformed them by DWT. Lastly, according to the different codes of each two sequential watermark bits, the algorithm chose one of two thresholds of just noticeable difference (JND) to modify the average value features of two corresponding detail sub-bands to insert the watermark into the host image. Extracting hidden information only to need the embedded image without the original host images and the data source file, implemented the blind extraction to improve the security of secret information. The experimental results show that the embedded watermark is invisible, and the algorithm is robust to common image processing operations. DOI: http://dx.doi.org/10.11591/telkomnika.v11i7.2934

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