http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
이현동,김충년,박광서,이광식,이동인,Lee, Hyun-Dong,Kim, Chung-Nyun,Park, Kwang-Seo,Lee, Kwang-Sik,Lee, Dong-In 대한전기학회 2000 전기학회논문지C Vol.55 No.12
This paper deals with the multiresolution analysis of wavelet transform for partial discharge(PD). Test arrangement is based on the needle-plane electrode system and applied AC high voltage. The measured PD signal was decomposed into "approximations" and "details". The approximation are the high scale, low-frequency components of the PD signal. The details are the low-scale, high frequency components. The decomposition process are iterated to 3 level, with successive approximation being decomposed in turn, so that PD signal is broken down into many lower-resolution components. Through the procedure of signal wavelet transform, signal noise extraction and signal reconstruction, the signal is analyzed to determine the magnitude of PD.
이현동,정원식,지재성 ( Hyun Dong Lee,Won Sik Chung,Chai Sung Gee ) 한국물환경학회 1998 한국물환경학회지 Vol.14 No.1
Water quality in water distribution system is changed biological, physicochemical and organoleptic qualities, and then it has been more worse. Chlorine residual was used to as indicator for prediction of water quality behavior, characteristics and ensurement of regulatory requirment. Therefore, M&O of chlorine residual is to be important for water quality management in water distribution system. This study was performed to study the relationship for water quality changes and characteristic of chlorine residual decay according to pipe type and diameter, hydraulic effect, and water quality parameter. Results of this study indicated decay coefficient of chlorine residual was to characterized with pipe type and diameter. Also it was to different hydraulic effect and initial chlorine residual concentration and water quality parameter as temperature, TOC, etc.
브롬이온 존재하에서 오존에 의한 암모니아성 질소의 산화에 관한 연구
이현동,종궁공 (宗宮功),이의신 ( Hyun Dong Lee,Isao Somia,Eui Sin Lee ) 한국물환경학회 1995 한국물환경학회지 Vol.11 No.3
This study was conducted in order to elucidate basic conditions for the oxidation of ammonia-nitrogen with ozone in bromide containing water. The denitrification rates were observed under the batch and the continuous types at various concentrations of Br, initial pH and ozone dosages. The result showed that the oxidation reaction of ammonia-nitrogen with ozone was not occurred in the presence of BrO₃, but denitrification and nitrification took place in the presence of Br. This implies that OBr functioned as the oxidant for the oxidation of ammonia-nitrogen. The reaction rate of denitrification was quasi Zero-order with respect to dissolved nitrogen compound concentration and the reaction rate constant, K can be expressed in terms of [Br] and [O₃]: K=0.023 [O₃]·[1-10 ^(m [Br])] The initial pH effect on denitrification rate was not significant in the range of pH 5.6∼10 but the removal rate was low at pH 3 presumably due to the retardation of OBr production under the low pH condition. Also with raising Br concentration, nitrification rate decreased but with raising initial pH, denitrification rate increased because ozone can react with NH₄ at fast rate. The denitrification kinetics obtained from batch experiment was used and applied to the continuous type process.