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- 저자 : 김충만(Choong Man KIM) (검색결과 4 건)
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김충만(Choong Man KIM),정규화(Gyu Hwa CHUNG),한창희(Chang Hee HAN) 전남대학교 수산과학연구소 1994 수산과학연구소논문집 Vol.3 No.-
The present experiment was designed to obtain the adequate condition of temperature, daylength and salinity on the gonadal maturation of adult female, spawning and hatching of egg, and growth of larvae of the freshwater crab Eriocheir japonicus. Gonadal maturation was influenced by water temperature, but not daylength. GSI of female crabs more increased in experimental regime of 18℃ than that of 10℃ without regard to photoperiod conditions(12L/12D and 15L/9D). However, in both photoperiod conditions of 26℃ regime, GSIs were not changed, and vitellogenic oocytes were not observed. Spawning was considerably influenced by water temperature and salinity without regard to daylength. Vitellogenic female crabs did not spawn at 10℃ in any conditions of salinity. However, at 18℃ and 26℃, over a half of rearing female crabs spawned in condition of 30% sea water(salinity 9.6‰) and 60% sea water(salinity 19.2‰), while no spawned females appeared in freshwater condition(salinity 0.0‰). In 20% sea water(salinity 6.4‰) and less conditions, ovigerous female crabs removed eggs from the abdormal egg-chamber of one s own self before hatching out. However, all ovigerous female crabs hatched out in 40% sea water(salinity 12.8‰) and more conditions. Hatching rates were 33.3% and 83.3% in 40% sea water condition and in 60% and 80% sea water conditions, respectively. In experiment of effects on temperature on hatch out of eggs, hatching rates of eggs were 66.7% and 83.3% at 18℃ and 26℃, respectively. whereas, at 10℃ and 32℃ conditions, ovigerous females died or removed eggs before hatching out. In investigation of days required to hatch out from brooding time according to the water temperature, required days to hatch out were 28.0±1.7 days in 18℃ condition and 14.0±0.3 days in 26℃. In 20% sea water and less conditions, zoea larva died before metamorphosing to larvae of megalopha stage. However, in 40% sea water and more conditions, zoea larva metamorphosed to megalopha stage. Rates of metamorphosed zoea larva to megalopha stage were 32%, 44% and 48% in conditions of 40%, 60% and 80% sea water, respectively. Under rearing condition of 80% sea water, all of the first stage of zoea larva reared at 10℃ did not metamorphose to the second zoea stage and than died within 24 days. At 15℃, 16% of zoea larva metamorphosed to the fifth zoea stage. However, larva metamorphsing to meglaopha stage were observed from 20 and 14 days rearing at 20℃ and 26℃, respectively.
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김충만,유은종,나창순,Kim, Choong-Man,Yu, Eun-Jong,Rha, Chang-Soon 한국전산구조공학회 2015 한국전산구조공학회논문집 Vol.28 No.1
본 논문에서는 대공간구조에 폭넓게 사용되는 단층 래티스돔의 비선형거동에 관한 비교 연구를 수행하였다. 단층 래티스돔은 특성상 두께가 얇은 쉘구조의 거동과 유사하므로 전통적인 쉘좌굴 이론을 적용하여 내력을 산출할 수 있으며 또한 이 결과를 유한요소해석 프로그램을 이용한 수치해석의 결과와 비교, 분석하였다. 쉘좌굴 이론을 이용하여서는 래티스 돔의 전체좌굴하중과 부재좌굴하중을 산정하였으며, 유한요소해석법을 이용하여서는 고유치 해석에 의한 좌굴하중과 기하학적 비선형 해석에 의한 극한하중을 각각 산정하였다. 래티스돔의 절점은 강절점 및 핀절점으로 각각 모델링하였다. 쉘좌굴이론에 의한 좌굴내력은 전체좌굴하중과 부재좌굴하중의 작은 값으로 결정되며 이 값은 유한요소해석을 이용한 고유치 해석보다는 비선형 해석에 의한 극한하중에 보다 근사한 값을 제공하였으며 또한 좌굴하중의 형식을 예측하는데에 유용하게 활용되었다. This paper presented the nonlinear behaviors of the single-layered lattice dome, which is widely used for the long-span structure system. The behaviors were analysed through the classical shell buckling theory as the single-layered lattice dome behaves like continum thin shell due to its geometric characteristics, and finite element analysis method using the software program Nastran. Shell buckling theory provides two types of buckling loads, the global- and member buckling, and finite element analysis provides the ultimate load of geometric nonlinear analysis as well as the buckling load of Eigen value solution. Two types of models for the lattice dome were analysed, that is rigid- and pin-jointed structure. Buckling load using the shell buckling theory for each type of lattice dome, governed by the minimum value of global buckling or member buckling load, resulted better estimation than the buckling load with Eigen value analysis. And it is useful to predict the buckling pattern, that is global buckling or member buckling.
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曺炷煥,金忠滿 조선대학교 기초과학연구소 1989 自然科學硏究 Vol.12 No.1
The species, distributon, composition and relative growth of all the living things caught in the bottom layer of Kwangyang Bay were investigated from the ecological viewpoint four times in 1982 as follows ; All the catches were classified into 55 species ; Pisces were 32 species, crustacea 13, mollusca 5, echinoderma 4 and coelelenterate 1. The compositions of all the species caught in the bay were; echinoderma was 55.9%(starfish occupied 54.3%), pisces 25.8%, crustacea 15.2%, mollusca 3.0% and coelenterata 0.1%. The mean body length and weight of the fish caugth much were ; Liparis tessellatus 9.4㎝ and 17.6g, Enedrias nebulo년 14.7㎝ and 16.9g and Harengula zuuasi 9.6㎝ and 7.7g, Eopsetta grigorjewi 9.7㎝ and 24.1g, Nibea argentatus 10.1㎝ and 12.7g, Aoanthogobius flavimanus 9.8㎝ and 9.7g, Astroconger myriaster 27.8㎝ and 35.7g Octopus ochellatus 12.2㎝ and 36.g respectively. The regression formular between the body length(L) and the body weight(W) is as follows ; Liparis tessellatus W=0.02744 L^2.75560 Enedrias nebulosus W=0.0035 L^3.05708 Astroconger myriaster W=0.00312 ^2.79419 Acanthogobius flavimanus W=0.02195 L^2.49911 Charybdis japonica W=1.01160 L^2.64030
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