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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 93 Documents
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Search results for , issue "Vol 11, No 10: October 2013" : 93 Documents clear
Study on Fault Feature Extraction of High-Speed Automaton Aiyu Wang; Hongxia Pan; Huiling Liu
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

In order to effectively extract the weak fault feature of high-speed automaton (HSA) in the environment with strong noises, a method of fault feature extraction was proposed based on wavelet packet energy entropy and fuzzy clustering algorithm. In this paper, wavelet packet was utilized to denoise the vibration signals of three working conditions of automaton, to decompose the signals and then to obtain eight frequency band energy entropies of each signal. Through processing and analyzing the features, the results show that there are obvious differences between three conditions, and the fuzzy clustering algorithm can identify the fault pattern of HSA accurately. The feature proposed by this extraction approach is proved to be able to effectively reflect the working state of the automaton, therefore the wavelet packet energy entropy could be considered as the feature parameters of HAS for fault identification and diagnosis. The fault feature extraction method can also provide a certain engineering application value for real-time monitoring and early fault diagnosis of this type HSA. DOI: http://dx.doi.org/10.11591/telkomnika.v11i10.3417 
Evaluation of Coal Mining Safety Management Information Sytem Based on the Internet of Things Zhu Jianjun; Li Mingxing
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

In this paper, we put forward three-level indicators and 13 secondary indicators via Delphi method. We improved the new fuzzy synthetic evaluation method from the aspect of coal-mining information management. After a comprehensive evaluation, 72.28% of people believed that security levels of Huaibei Mining Group belonged to good & moderate one, and 27.72% of people held that security status of Group was poor & very poor condition on the basis of comprehensive evaluation. Therefore, security management information system in Huaibei Mining Group belonged to the middle level. By using the new indicators and research method, the countermeasures were given to improve safety management on the basis of the internet of things. DOI: http://dx.doi.org/10.11591/telkomnika.v11i10.3433 
Multi-walled Carbon Nanotube Film Sensor for Ethanol Gas Detection Dongzhi Zhang
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

Multi-wall carbon nanotubes (MWNTs) film-based sensor on the substrate of printed circuit board (PCB) with interdigital electrodes (IDE) were fabricated using layer-by-layer self-assembly, and the electrical properties of MWNTs film sensor were investigated through establishing models involved with number of self-assembled layers and IDE finger gap, and also its ethanol gas-sensing properties with varying gas concentration are characterized at room temperature.Through comparing with the thermal evaporation method, the experiment results shown that the layer-by-layer self-assembled MWNTs film sensor have a faster response and more sensitive resistance change when exposed to ethanol gas, indicated a prospective application for ethanol gas detection with high performance and low-cost. DOI: http://dx.doi.org/10.11591/telkomnika.v11i10.2726

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