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Influence of Water Temperature and Salinity on Sand Ejection of Manila Clam, Ruditapes philippinarum
강경호,김재민,김영훈,Kang, Kyoung-Ho,Kim, Jae-Min,Kim, Young-Hun 한국패류학회 2005 The Korean Journal of Malacology Vol.21 No.1
In this study, the influence of water temperature and salinity on sand ejection of Manila clams, Ruditapes philippinarum, was investigated. The result showed that, under different water temperature, the highest quantity of sand ejection was at $20^{\circ}C$, the value of which was 0.091 g, while the smallest one was only 0.058 g at 0$^{\circ}C$. The highest releasing rate, 95.79%, could be seen in $20^{\circ}C$ group, while $0^{\circ}C$ group was the lowest one, 85.29%. Under different salinity, 30 psu group had the highest value, 0.057 g, and 0 psu (freshwater) group was the lowest one, only 0.026 g. At the same time, the highest releasing rate appeared at 25 psu, which was 90%. 0 psu group was the lowest one in releasing rate, 60.47%. According to these results, we recommend that the clams should be placed into the clear seawater with about 25 psu of salinity at near $20^{\circ}C$ to let the clams perform the self-depuration. Better quality of clams containing less impurity in the aquaculture and commerce could be obtained from this pre-treatment.
강경호,손승찬,김재민,김현정,Kang, Kyoung-Ho,Seon, Seung-Cheon,Kim, Jae-Min,Zhuo, Liang Liang,Lim, Sang-Min,Kim, Hyeon-Jeong The Malacological Society of Korea 2009 The Korean Journal of Malacology Vol.25 No.1
The trumpet shell Charonia sauliae is an endangered and valuable species with potential for aquaculture. For artificial propagation of C. sauliae, the effects of three different food microalgae on the development, growth, and survival rate of the larvae and spat were investigated. For the larval feeding experiments, we utilized six microalgae species as food sources, namely Pavlova lutheri, Tetraselmis suecica, Nannochloris oculata, Isochrysis galbana, Chaetoceros calcitrans, and Phaeodactylum tricornutum; for the larval and spat growth and survival experiments, we utilized T. suecica, C. calcitrans, and P. tricornutum. The results showed that the temporal digestion index (TDI) for the veliger larvae was significantly different for C. sauliae fed the different microalgae species (p < 0.05), that the T. suecica, C. calcitrans, and P. tricornutum cultivars were better suited for larval consumption (p < 0.05), and that the growth and survival of the larvae and spat were significantly influenced by food type, specifically P. tricornutum (p < 0.05). Further research is needed to evaluate the effects of other microalgae species, different algal concentrations, and biochemical composition on the growth and survival of C. sauliae.
Gonadal Development and Reproduction in the Trumpet Shell, Charonia sauliae
강경호,김재민,선승찬,김현정,Kang, Kyoung-Ho,Kim, Jae-Min,Seon, Seung-Cheon,Zhuo, Liang Liang,Lim, Sang-Min,Kim, Hyeon-Jeong The Malacological Society of Korea 2009 The Korean Journal of Malacology Vol.25 No.1
This study devised and tested a histological staging system for gonadal development in the trumpet shell, Charonia sauliae, which was collected along the south coast of Jeju Island, South Korea. This paper details for the first time the gonadal development characteristics of C. sauliae. Ovary and testis development in C. sauliae can be roughly divided into five stages: growing, mature, spent, degenerative, and resting. The trumpet shelll has multiple fecundation and fertilization during the spawning season for out-of-step gonadal development in high-temperature and low-salinity environments. Female trumpet shell tended to have larger shells and were more abundant than males (64.26% of all animals collected were female).
Ag/TiO<sub>2</sub> 미세입자 합성물의 특성 분석
강경호 ( Kyungho Kang ),조용기 ( Yonggi Jo ),김순금 ( Sun-geum Kim ) 한국전기전자재료학회 2024 전기전자재료학회논문지 Vol.37 No.2
This study examines a manufacturing process for the photoelectrode material of dye-sensitized solar cell (DSSC) intending to increase efficiency through the surface plasmon resonance phenomenon of nanoparticles with a composite structure made of Ag and TiO<sub>2</sub>. This invention involves the use of Ag and TiO<sub>2</sub> nanoparticles in the solar cell. These nanoparticles cause surface plasmon resonance, which amplifies and scatters incident solar energy, enhancing the dye’s rate of light absorption. It also makes it possible to absorb energy in wavelength ranges that were previously difficult to do, which increases efficiency. Centrifugal separation and heat synthesis are used to create the composite metal structures, and certain combinations are used to decide the particle morphologies. To increase the efficiency of organic solar cells and DSSC, the Ag/TiO<sub>2</sub> composite structure is therefore quite likely to be used.
복합혼합날개를 장착한 5×5 봉다발에서 부수로 혼합 및 임계열유속 실험 연구
강경호(K. H. Kang),신창환(C. H. Shin),추연준(Y. J. Choo),윤영중(Y. J. Youn),박종국(J. K. Park),문상기(S. K. Moon),천세영(S. Y. Chun) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
Experiments were performed to determine the thermal (or turbulent) diffusion coefficient (TDC) and to investigate the critical heat flux (CHF) performance in the 5×5 rod bundle with 5 unheated rods which are supported by Hybrid Mixing Vane. In this study, HFC-134a fluid was used as working fluid and the fluid temperature were measured in the important subchannels. To determine the TDC value, the measured fluid temperatures were compared with the predicted values obtained from the MATRA code. The best optimized value of β was found to be 0.02 by considering prediction statistics, i.e., average and standard deviations of the differences between the experimental results and code calculations. Using the best optimized value of β as 0.02, the MATRA code predicts the test results of the fluid temperature within ±1.0 % of error. According to the experimental results on CHF of 5 non-heating guide tubes, the case with non-heating guide tube showed a little good performance in terms of CHF.
1:5000 수치지형도를 이용한 ASTER DEM, SRTM DEM의 정확도 검증
강경호(Kyung-Ho Kang),손홍규(Hong-Gyoo Sohn),정재훈(Jae-Hoon Jung),최시경(Si-Kyong Choi) 대한공간정보학회 2009 한국지형공간정보학회 학술대회 Vol.2009 No.9
본 논문에서는 국토지리정보원에서 제작한 1:5000 수치지형도에서 추출한 등고선을 이용하여 생성된 DEM과 최근 세계 모든 지역의 3차원 DEM 정보를 제공하고 있는 SRTM DEM과 ASTER DEM을 대상으로 한반도 지역의 DEM 구축 정확도를 평가하였다. 이를 위하여 먼저 대상지역의 1:5000 수치지형도를 통해 DEM을 생성하고 동일한 지역의 SRTM DEM과 ASTER OEM을 취득하여 상호 중첩비교가 용이하도록 동일한 투영방식으로 변환하였다. 특히, 한반도 지형특성을 고려하여 산악지역, 평지, 산악지역과 평지가 적절하게 분포하고 있는 설악, 안양, 진안 세 지역의 DEM 구축 정확도를 비교분석하였다. 본 연구에서는 자료수집과정에서 발생한 국부적인 hole(void) 등을 제거한 filled finished SRTM OEM을 활용하였다. DEM 구축 정확도 비교는 수치지형도 등고선을 기반으로 구축된 DEM을 기준으로 SRTM DEM과 ASTER DEM의 통계적 분석과 각 DEM의 동일 픽셀간 RMSE를 비교하였으며, 그 결과 두 DEM 자료 모두 수치지형도 DEM과의 상대적인 오차가 약 11~12m로 나타났다. 특히 30m 해상도의 ASTER DEM은 향후 한반도 전역의 DEM 3차원 정보 구축 등에 충분히 활용할 수 있을 것으로 기대된다.