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스마트 그리드 배전계통에서 인공신경회로망을 이용한 DSP 기반 실시간 고장 판단 방법론 기초 연구
김진언(Jin-Eun Kim),이유림(Yu-Rim Lee),최정우(Jung-Woo Choi),노병훈(Byung-Hoon Roh),고윤석(Yun-Seok Ko) 한국전자통신학회 2023 한국전자통신학회 논문지 Vol.18 No.5
본 논문에서는 스마트 그리드 배전 계통에서 선로상의 고장으로부터 계통을 보호하기 위한 인공 신경 회로망을 기반으로 하는 고장 판단 방법론을 제안하였다. 제안된 방법론에서는 먼저 전류 실효값 크기를 기반으로 일반 고장 여부를 판단하고 다음, 정상 전류로 판단되는 경우 인공 신경 회로망을 기반으로 하는 normal/HIF classifier를 이용하여 고 임피던스 지락 고장 여부를 판단하도록 설계하였다. 반복적인 DSP 모듈 기반 알고리즘 검증 시험들 중에서, 실효 값 크기가 최소 동작전류보다 작은 정상 전류 파형 시험인 경우에 normal/HIF classifier가 전류 파형을 정상상태로 인식하여 부 동작하였으며, 반면에, 저 임피던스 고장의 경우는 고장 상태로 인식하여 정해진 절차에 따라 재폐로 동작을 보임으로써 제안된 방법론의 유효성을 확인할 수 있었다. In this paper, a fault determination methodology based on an artificial neural network was proposed to protect the system from faults on the lines in the smart grid distribution system. In the proposed methodology, first, it was designed to determine whether there is a low impedance line fault (LIF) based on the magnitude of the current RMS value, and if it is determined to be a normal current, it was designed to determine whether a high impedance ground fault (HIF) is present using Normal/HIF classifier based on artificial neural network. Among repetitive DSP module-based algorithm verification tests, the normal/HIF classifier recognized the current waveform as normal and did not show reclosing operation for the cases of normal state current waveform simulation test where the RMS value was smaller than the minimum operating current value. On the other hand, for the cases of LIF where RMS value is greater than the minimum operating current value, the validity of the proposed methodology could be confirmed by immediately recognizing it as a fault state and showing reclosing operation according to the prescribed procedure.
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박평문(Pyung Moon Park),양점홍(Jum Hong Yang),이종완(Jong Wan Lee),안상조(Sang Jo An),김태왕(Tai Wang Kim),이창준(Chang Jun Lee),안진언(Jin Eun An),한송희(Song Hee Han) 한국발육발달학회 1998 한국발육발달학회지 Vol.6 No.1
The purpose of this study was to analyze and identify the motor ability and process of development according to ages, sexes and between deaf and hard of hearing in the hearing impaired children through the Oseresky`s motor ability test, and the subjects of this study were 77 hearing impaired children(boys=40, girls=37). From the resutt and discussions of the study, the conclusions are as follows; 1. The motor ability level in ages : The motor ability level in ages, on the average, was late about 11 months. In the subordinate items, the static coordination was significant difference(p$lt;.001). 2. The motor ability level in bath sexes : The motor ability level in both sexes was no difference, but in general movements coordination test, boys were 1.46 years more higher than that of girls. The difference was significant(p$lt;.05). 3. The motor ability level in deaf and hard of hearing. : The motor ability level was hand of hearing more than higher that of deaf especially, in static coordination test, hard of hearing were 1.76 years more higher than that of deaf. The difference was significant(p$lt;.05). 4. The motor ability level bring with advanced in age : According to advanced in age, on the whole, motor ability level was improved, but in the subordinate items, static coordination was late about 10 months at 10 years old.
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김상구,류동춘,이영식,손진언 한국환경과학회 1995 한국환경과학회지 Vol.4 No.5
This study was carried out to evaluate the variations of headloss rate and of specific deposit to depths with effective size of media and configuration of filter layer during algae blooming period. 0.51㎜ size media was disqualified because most of headloss occurred rapidly below 5㎝ from surface layer. however 0.91㎜ size media acted deep filtration more than 20㎝ from top, as result 0.91㎜ size media filter had 2∼3 times longer filtration time than 0.51㎜ size media filter, but 0.91㎜ size media have break-through potentiality. multi-layer filter with 1.02㎜ anthracite and 0.51㎜ sand had large deposit volume in upper layer that could longer filtration time, moreover smaller media in lower layer that could protect break-through.
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