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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 80 Documents
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Search results for , issue "Vol 11, No 6: June 2013" : 80 Documents clear
Blind equalization based on T/4 fractionally spaced decision feedback equalizer with RLS algorithm Ying XIAO
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

To further improve the performance of blind equalization based on T/4 fractionally spaced decision feedback equalizer, RLS algorithm is adopted to update the weights of equalizer according to simplified constant modulus algorithm (CMA) cost function. CMA cost function is simplified to meet second norm form in this work, and then the forward filter of equalizer with T/4 fractionally-spaced updates by RLS algorithm and the feedback filter of equalizer with symbol-spaced updates by gradient descent algorithm. Computer simulation results show that the algorithm proposed in this work has faster convergence rate and lower mean square error compare with blind equalization based on symbol-spaced and T/4 fractionally-spaced decision feedback equalizer based on gradient descend algorithm.DOI: http://dx.doi.org/10.11591/telkomnika.v11i6.2156
A Rapid Detection System Based on LabVIEW and Microcomputer Ding Jianjun; Sun Chao; Wang Jun; Shao Jiayan; Liu Yanqun
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

Excessive inhalation of formaldehyde is harmful to health. A quickly digital detection model of the content of formaldehyde in the air is designed in this paper. It can change nanoamps current into proper Voltage for TLC1543 through MAX407 and OP37.And a hardware circuit is designed for adaption and acquisition of the data. The method of this system is sending the signal to the host computer through a serial port and then showing the content of formaldehyde on the PC. Such digital detection of formaldehyde can be used to judge whether the content of formaldehyde is over the sustaining level of human body in a intuitive and quickly way. DOI: http://dx.doi.org/10.11591/telkomnika.v11i6.2615
Study on Frequency Control Based on WTTP Frequency Detection Method Zhanfeng Ying; Yunyun Chen; Junji Wu
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

For improving the precision of power system frequency control under the condition of noise and harmonic interference, a new power system frequency control algorithm is proposed based on WTTP frequency detection method, which is a combination of wavelet transform and three-point frequency detection method. Fundamental component can be extracted from distorted signal by wavelet transform under asynchronous sampling, and then three-point frequency detection method is used to detect fundamental component frequency. For improving the detection precision, error mathematics mechanism of three-point frequency detection method is analyzed and error mitigation method is proposed. Even though there is noise and harmonic interference in feedback loop, power system frequency can be controlled accurately and stably by applying WTTP frequency detection method to power system frequency control. Simulation results demonstrate the feasibility of algorithm. DOI: http://dx.doi.org/10.11591/telkomnika.v11i6.2665
Decoupling Control Strategy of D-STATCOM Guangzheng Wang; Zeng Ping; Juan Zhang; Yujie Guo
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

 In Distribution Network, Distribution Static Synchronous Compensator (D-STATCOM) can stabilize turn-on point voltage, effectively reduce the transmission losses in power, improve the power factor and prevent the non-linear load. But under the circumstance of the d- and q-axis, D-STATCOM is a non-linear and strong coupling system, so decoupling control is very useful, that is because the decoupling control can ensure the output current fast track and have on different with the setting values. Study the decoupling control strategy of D-STATCOM, through the analysis of its basic structure, and then get the model of the coupling term. Due to avoid active and reactive current coupling, Fuzzy Immune PI Controller and inverse system method are combined to be used in the original system. Finally, the results are shown by the MATLAB simulation that the proposed decoupling control strategy is very good, because the performance is excellent, the structure is simple and easy to be implemented. DOI: http://dx.doi.org/10.11591/telkomnika.v11i6.2684
Directionality based Location Discovery Scheme Using Beacon Nodes with Transmission Capabilities throughout Sensor Network Qinli An; Jianfeng Chen
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

In this paper, we propose a range-free localization scheme for wireless sensor networks (WSNs) using four beacon nodes(BNs) equipped with a directional antenna with special transmission capabilities for sending wireless beacon signals throughout the sensor network. Each beacon node rotates with a constant angular speed and broadcasts its angular bearings. A sensor node can determine its location by listening to wireless transmissions from the four fixed beacon nodes. The proposed method is based on an angle-of-arrival estimation technique that does not increase the complexity or cost of construction of the sensor nodes. We present error analysis and the best positions of beacon nodes in the proposed method. Numerical results, obtained by simulating several scenarios, show that the algorithm can reach a good level of convergence. DOI: http://dx.doi.org/10.11591/telkomnika.v11i6.2705
Influencing Factors of Breaking Capacity of Double-Break Vacuum Circuit Breakers Shengwen Shu; Jiangjun Ruan; Daochun Huang; Gaobo Wu
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

Using a series arrangement of two vacuum interrupters (VIs) has been proved to be an effective way of developing higher voltage vacuum circuit breakers (VCBs), which are known as double-break VCBs. The uniform distribution of the transient recovery voltage (TRV) across each VI is very critical for the breaking capacity of double-break VCBs. In this paper, the TRV distribution characteristics of double-break VCBs was studied by the synthetic test and the PSCAD/EMTDC simulation based on a vacuum arc interruption model. The results show that the bias of the TRV distribution ratio is caused by the stray capacitance and the imbalanced post arc plasma characteristic in each VI, which is consistent with the theoretical analysis. Moreover, the negative effect of grading capacitors was discussed. The results show that it is advisable to limit the value of grading capacitors to those ranges which can guarantee sufficiently improve the voltage distribution.DOI: http://dx.doi.org/10.11591/telkomnika.v11i6.2140
Eliminating Noise of Mud Pressure Phase Shift Keying Signals with A Self-Adaptive Filter Yue Shen; Lingtan Zhang; Heng Zhang; Yinao Su; Limin Sheng; Lin Li
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

The feasibility of applying a self-adaptive filter to eliminate noise in the downhole mud pressure phase shift keying (PSK) signals is studied. The self-adaptive filter with carrier wave as the filter input signal and mud pressure PSK signal including noise as the filter expected input signal in structure was adopted to process the mud pressure PSK signals with the broadband signal characteristic in communication. Mathematical model of the filter was built to reconstruct the mud pressure PSK signals based on the evaluation criterion of least mean square error (LMS) and the mathematical model of mud pressure PSK signals. According to the filter mathematical model, a special self-adaptive control algorithm was adopted to realize the filter by adjusting the filter weight coefficients self-adaptively and the impacts of the filter step-size factor on signal to noise ratio (SNR) and distortion factors of the reconstructed mud pressure PSK signals were analyzed. Numerical calculation and simulation show that the self-adaptive filter can efficiently eliminate random noise in the signal frequency band and reconstruct the mud pressure PSK signals. In addition, low distortion factors of the reconstructed mud pressure PSK signals can be obtained by reasonable selecting the filter step-size factor. DOI: http://dx.doi.org/10.11591/telkomnika.v11i6.2610
Towards Building Web Based Augmented Reality Application for Pre-School Children Sule Tekkesinoglu; Mohd Shahrizal Sunar; Cik Suhaimi Yusof
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

The goal of this work is to present a concept for web based Augmented Reality. We have many examples of Augmented Reality systems in different field from military applications to medical applications, from entertainment to manufacturing. In this paper we worked on how virtual environments can be combined with web based applications. Internet users need web sites for many reasons in daily life. On the other hand, Augmented Reality is one of the popular fields on virtual environment technologies that it would be useful to associate these two technologies. In this study JavaScript were used as main language to build Augmented Reality application supported by three different libraries each with a specific role. The libraries which are used through coding are Flartoolkit, Papervision3D, and Flex SDK. The outcome of this combined algorithms shows that the method is accomplished web based Augmented Reality for preschool children to provide educators a way to teach students with deeper, and more meaningful experiences in the academy. DOI: http://dx.doi.org/10.11591/telkomnika.v11i6.2659
Study on Defect Detecting and Locating Method of Tubular Cylindrical Conductor Yinchuan Wu; Baolong Guo; Jiatian Zhang; Zhengguo Yan
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

This paper is to present a defect detecting and locating method of tubular cylindrical conductor based on alternating current impedance measurement theory. A defect estimation  can be made through the impedance measurement of some distance on the inner and the outer surfaces of the tubular cylindrical conductor. A defect in the thickness direction can be located by the skin effect influence on impedance and the frequency change in exciting current. The results show that: this method can effectively identify and locate a defect, and therefore should be promoted in the defect detecting of metal materials in other shapes. DOI: http://dx.doi.org/10.11591/telkomnika.v11i6.2676
Group Interaction Method Based on Wireless Sensor Network Wu Qun; Zhou Haojie; Bi Xiangang
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

This paper presents a group interaction method based on Wireless Sensor Network which supplies new attempts and ideas for human-computer interaction. Firstly, analyze group interaction framework that is different from the monomer interaction, then integrate data language of group interaction based on user’s purpose so that the Wireless Sensor Network technology and methods are applied to the system of group interaction. Finally, group interaction toys based on Wireless Sensor Network are developed. Each of toy monomers is compactly filled with sensors, wireless communication devices, LED lights. The Wireless Sensor Network which is composed of many monomers makes interface function come true in virtual. The users not only act on the physical object but also act directly on the "data" when they use the device. Currently the functions including light transmission and light color blending have been accomplished and developing. DOI: http://dx.doi.org/10.11591/telkomnika.v11i6.2700

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