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성숙도가 다른 인삼 접합자배의 (接合子胚) 자엽으로부터 형성되는 체세포배의 (體細胞胚) 기원
최용의(Yong Eui Choi),소웅영(Woong Young Soh) 한국식물학회 1994 Journal of Plant Biology Vol.37 No.3
Excised cotyledon segments of ginseng zygotic embryos at various developmental stages were cultured on MS basal medium from which somatic embryos were directly induced. The frequency of somatic embryo formation on segments declined with the advancing zygotic embryo maturity. All of the cells in the cotyledons of immature zygotic embryos were smaller and more densely cytoplasmic than those in mature embryos. Histological examinations revealed that the poly-somatic embryos formed on immature embryos were of multi-cell origin and derived from the epidermal and subepidermal cell layers. However, in the cotyledon of germinating zygotic embryos, only the epidermal cells were densely cytoplasmic and singularly competent to develop into somatic embryos resulting into single embryos at a frequency of 100%.
비파괴 콘크리트 압축강도 측정용 전자식 타격응답 장치 개발
최용만(Choi Man Yong),장선재(Jang Sun Jae),박정학(Park Jeong Hak),박해원(Park Hae Won) 한국구조물진단유지관리학회 2007 한국구조물진단학회 학술발표회논문집 Vol.11 No.1
This paper describes for development of electronic impact hammer of the non-destructive for compressive strength measurement of concrete. There is test method for rebound number, it is used most plentifully in safety inspection of the infrastructure. This electronic impact hammer, it solved the problem of schumidt hammer. It acquires the reliability which is excellent existing schumidt hammer compared to. The electronic impact hammer measurement data is acquired from the detection coil the velocity which and a degree of acceleration response waveform, it will be able to measure the compressive strength of the concrete. In this paper described, it is development for accurate measure of the compressive strength of the concrete which it is electronic impact hammer.