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토석류 예측 모델을 이용한 재해취약 지역에서의 토사재해에 관한 연구
임종성,이호진,김성덕,조성근 (사)위기관리이론과실천 2023 Crisisonomy Vol.19 No.9
Torrential rains occurring during the unpredictable climate change cause many mountain disasters in vulnerable areas. This study is to analyze the debris flow mechanism by applying the multiplier of the vulnerable area debris flow prediction model presented by USACE to the erosion or sedimentation model. The higher the typhoon category, the higher the debris flow peak value, and the frequency of peaks of flow discharge with long durations increased. Analysis of changes in vegetation density showed that the initial peak value of the debris flow reaching the bottom was highest due to dense vegetation, and high-amplitude fluctuations appeared due to energy dissipation. In the case of heavy rainfall, the peak value of debris flow increased by more than 22%, and fluctuations of flow discharge occurred earlier at the elapsed time. In addition, debris flow fluctuations with high wave heights appeared, and the high-amplitude band width also appeared to be quite long. The analysis of present study will provide information for developing and prevention disaster reduction measures in vulnerable areas.
家蠶에 寄生하는 Nuclear-Polyhedrosis Virus와 새로운 Microsporidia(Nosema sp. M_12)間의 相互作用
林鍾聲,韓明世 경북대학교 1981 새마을 硏究論叢 Vol.1 No.-
In the application of infectious microorganisms of insects to microbial control the interaction among those pathogens has been considered to be very important factors in causing synergism or intereference. In these respects this research was concentrated on the interaction between the nuclear polyhedrosis virus(NPV) and a newly isolated microsporidia, Nosema sp.(M_12) in the larvae of silkworm, Bombyx mori(L.), including comparisions of their pathogenecity and histopathological symptoms. The interference was observed between the two pathogens were incoculated per os to the second-instar larvae of the silkworm at the same time. In the response of the interaction the degree of interference by was greater than that by the NPV. However, the former pathognn M_12 was not interfered by the challanging NPV while the former NPV was considerably interfered by the challanging M_12 when they were inoculated per os at the intereval of 24 hours at the second-instar larvae. In the histopathological observations the sites of inteference were observed in some tissue like fat body or cell unit though one of the pathogens was dominant in each tissue. From the point of microbial control views it is neither recommendable to use NPV and M_12 at the same time nor the same areas in the case of both pathogens to be used as a microbial insecticide.
家蠶에 寄生하는 새로운 Microsporidia(Nosema sp.)에 關한 硏究
林鍾聲,金鍾聲 경북대학교 1981 새마을 硏究論叢 Vol.1 No.-
This experiment was conducted to make a fundamental study on the new microsporidia (Nosema sp) isolated from mother moths of the silkworm, Bombyx mori L. in the process of the mother moth inspection in the Kyung Pook Province, Korea. The obtained results are as the following. 1. The results of survey on the 12 areas through the insfection of mother moths revealed that the 11 areas were contaminated with the new microsporidia. 2. The average size of the new microsporidia spores is 4.5+0.05 in length and 2.0±0.03 in width. 3. The staining property of the new microsporidian spores with Giemsa's stain and Safranin-O stain showed the same as that of Nosema bombycis spores. 4. In the histopathological observation, the susceptible tissues or organs were disclosed to be verified such as muscle, trachea, silkgldnd, fat body, and the basement membrane of the mid-gut. 5. In the pathogenecity of the new microsporidia isolated from Korea and Japan, the ID_50 of the new microsporidia from Korea and Japan in second instar larvae of silkworm were 2.7×10/ml, 2.6×10ml, respectively.
家蠶으로부터 分離된 새로운 Microsporidia S80의 特性
林鍾聲,趙世衍 COLLEGE OF AGRICULTURE KYUNGPOOK NATIONAL UNIVERSI 1983 慶北大農學誌 Vol.1 No.-
The new microsporidia S80 isolated from, Bombyx mori L. in Korea showed ovoid in the morphology of the spores and the size were measured 2.9±0.28μ in length and 1.7±0.29μ width. No other microsporidian spore like this has not been so far isolated from Silkworm. The length of the polar filament extruded in hydrogen peroxide (H_(2)O_(2)) at 30℃ was 26μ of a round cytoplasm on the top. The spores were partly stained with Giemsa, Safranin-O and Gram as the same staining properties as Nosema bombycis, Microsporidia K 79 and other microsporidian spores. The fine structures were observed under scanning eleceron microscope through ultrathin sectioning. The spore wall was composed of three layers ; the thin exospore of an electron dense rippled layer, the thick electron lucent endospore which was thinning considerably at the polar filament insertion point, and the inner limiting membrane. Polar cap present at the sporeapex, with a long polar filament of 12-13 coils, subtending angle of 60˚ to spore axis, which is tubular made up of a multilayered and are a benes core, light ring structure enclosing the dance core, the dark ring structure enclosing the inner light ring structure and the other than and light ring structure bounded from cytoplasm. Lamellate polaroplast occupied the anterior part of the spore, and the two neclei with dense nucleoplasm bounded by a double nuclear envelope were cited in the slight downer middle portion of spore. From the characteristics of the shape, size and fine structures, it is certain to reason the Microsporidia S80 belong to the phylum Microspora, class Microspora, order Microsporida. order Microsporida. The shape of two nuclei cited seems to be genus Nosema, but in the classification for the suborder it should be defined wheather pansporoblasts be formed or not and for the genis especial attempts have been made to define the characters which distinguish the disporous genera in the life cycle. Survey through the infection of the bad cocoons during 1980 to 1982 in South Korea the areas contaminated with new microsporidia were revealed 5 provinces of Kyung-Gi, Kang-Won, Chung-Nam and Chun-Nam. Pathological effects inoculated per os at second instar larvae of silkworm, the LD 50 was 7.1×10^(7)/ml as lower pathogenecity than that of Nosema bombycis Naegeli of 1.2×10_(7)/ml. While on the other hand the inoculation of the microsporidia at fourth instar larvae lowerd the whole cocoon weight and cocoon shell wegith and significant at 1% level. The microsporidia S80 defined it can not be transmitted transovarially from the result of predictive and collective examination of 21 egg barches from the infected female moth.