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신현만(Hyunman Shin),장우진(Woojin Jang) 한국조명·전기설비학회 2016 조명·전기설비학회논문지 Vol.30 No.11
The fluorescent luminaires in classrooms have been replaced with LED ones in accordance with the “Regulations to promote the rationalization of energy use in public institutions”. In schools, the existing fluorescent luminaires work well with new lamps and ballasts made by different manufactures and they fail to work, the only faulty parts are needed to be replaced. However, a faulty LED luminaire have to be replaced with a whole new one. Thus, users hope that the maintenance of LED luminaires is as economical and easy as that of fluorescent luminaires. In this study the usages of existing fluorescent luminaires were investigated and the economic efficiency of the LED luminaires was analyzed with LCC method using the surveyed data. The economic effect of replacing the existing flourescent luminaires with LED ones depends on not only the duration of luminaire usage but also the possibility of parts replacement. Thus, replacement of only faulty parts is required to secure better economic efficiency for the maintenance of the LED luminaire.
충북에서 사과 주요 토양병에 의한 고사율과 재배환경과의 상관관계
이성희,권의석,신현만,김익제,남상영,홍의연,김대일,차재순,Lee, Sung-Hee,Kwon, Yeuseok,Shin, Hyunman,Kim, Ik-Jei,Nam, Sang-Young,Hong, Eui Yon,Kim, Daeil,Cha, Jae-Soon 한국식물병리학회 2017 식물병연구 Vol.23 No.1
이전 연구에서 충북지방의 사과과수원에서 토양병에 의한 사과나무 고사율이 매우 높게 나타났다. 본 연구에서는 토양병에 의한 사과나무 고사율과 재배환경과의 상관관계를 조사하였다. 자주날개무늬병에 의한 사과나무 고사율은 토양 내 칼슘 함량과 유의하게 정의 상관관계를 보였고, 흰날개무늬병에 의한 사과나무 고사율은 토양 내 유효 인산 함량과 유의하게 정의 상관관계를 보였다. 반면에 역병 피해 사과원 14개소에서는 사과나무 고사율과 재배환경과는 유의성 있는 상관관계가 없었다. 세분화한 재배환경과의 상관관계 분석결과는 토양 내 칼슘함량 외에 과원 경사도와 착과수가 자주날개무늬병에 의한 고사율에 영향을 미쳤고, 토양 내 유효인산 함량 외에 칼슘 함량이 흰날개무늬병에 의한 고사율에 영향을 미쳤다. 과원경사도, 토성, 마그네슘과 칼슘 함량이 사과역병에 의한 고사율에 영향을 주었다. 이 결과는 사과과원의 재배법 변경에 의해 토양병에 의한 사과나무 고사율을 감소시키는 데 적용 가능할 것이다. The previous study showed that die-back of apple trees caused by soil-borne diseases was significantly high in the apple orchards in Chungbuk province. The correlation between dieback ratio and cultivation environment in apple orchards infected by soil-borne diseases was investigated in this study. The dieback ratio of five orchards diseased by violet root rot and five places infected by white root rot showed significantly positive correlation with Ca content and available $P_2O_5$ content in soil, respectively. Whereas, the dieback ratio of fourteen orchards diseased by Phytophthora root rot was not significant. Subgrouping of cultivation environment analysis showed that the slope degree of orchard and the number of fruit setting also affected the dieback ratio caused by violet root rot and Ca content in soil also affected the dieback ratio caused by white root rot. It showed that the slope degree, soil texture, Mg and Ca content affected the dieback ratio caused by Phytophthora root rot. These results can be applied to reduce die-back ratio by the modification cultivation environment for each soil-borne disease.