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한국産 황어의 종묘생산에 관한 연구 1. 産卵習性 및 初期生活史
조재권,오성현,노병율,한경호,성기백,박준택 麗水大學校 産業基術硏究所 1999 産業基術硏究所 論文集 Vol.8 No.-
강원도 양양군에 위치한 남대천과 전라남도 섬진강에 분포하고 있는 황어의 종료생산을 위한 기초자료로 産卵習性과 初期生活史에 관하여 관찰한 결과는 다음과 같다. 황어의 産卵期는 자연상태에서 3∼6月이고, 産卵은 흐르는 하천의 자갈 밑에 하였으며, 受精된 卵은 작은 자갈의 표면에 붙어있었다. 알의 크기는 2.70∼3.20㎜(평균 3.00㎜)로 油球는 없었다. 孵化는 평균 사육수온 10.60℃에서 受精 後 300시간부터 시작되었으며, 312시간만에 완료되었다. 孵化 直後의 仔魚는 전장 6.35∼6.87㎜(평균 10.67㎜)로 난황이 거의 흡수되어 後期仔魚期로 접어들며, 입과 항문이 열려있었다. 孵化 後 7∼9일째 後期仔魚는 전장 11.35∼12.30㎜(평균 11.65㎜)로 등지느러미가 생길 부분이 융기하기 시작하였다. 孵化 後 12∼13일째 개체는 전장 12.65∼13.15㎜(평균 12.80)로 이때부터 Daphnia sp.와 Brachionus plicatilis를 攝餌하였으며, 성장이 다소 빨라졌고, 脊索의 끝부분은 45°위로 굽어져 있었다. 孵化 後 43∼45일째의 개체는 전장이 19.55∼22.85㎜(평균 21.95㎜)로 모든 지느러미 줄기가 정수에 달하여 稚魚期로 이행하였다. 孵化 後 50∼52일째의 稚魚들은 전장이 21.54∼27.35㎜(평균 24.55㎜)로 몸의 형태, 체색 및 옆줄이 완전하게 형성되어 成魚에 닮아 있었다. The spawning behavior and early life history of sea rundace, Tribolodon hakonensis were studied. Spawning of T. hakonensis occurs enmasse on bottoms of stream with a spawning season of March to June. The eggs are attached to the under surface of the gravel. The eggs riped were demersal and adhesive, and their diameter were 2.70∼3.20㎜(mean 3.00㎜). Hatching was started at 300 hours after fertilization at mean water temperature 10.60℃. Newly-hatched larvae were 6.35∼6.87㎜ in total length(TL, Mean 6.65㎜), and mouth and anus were not yet opened. 4∼5 days old larvae transformed to postlarva stage and they were 10.25㎜∼11.15㎜ in TL (mean 10.67㎜). As yolk sac were nearly absorbed, mouth and anus were opened. In 7∼9 days after hatching, total length 11.35∼12.30㎜(mean 11.65㎜). The part of the fin-fold at dorsal fin became high. 12∼13 days old larvae were 12.65∼13.15㎜ in TL(mean 12.80㎜), and they fed Daphnia sp. and Brachionus plicatilis actively. In this time the growth rate slightly increased and tip of notocord was flesed on upward. Aggregate numbers of all fin rays were completed at over 19.55∼22.85㎜ in TL(43∼45 days after hatching), at which time the larvae reached the juvenile stage. 50∼52 days old larvae(21.54∼27.35㎜ in TL) were similar in body from, lateral line and color with adult.
Baik Kyeong-Ho 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
In this study, multi-ply SiC fiber reinforced Ti-6Al-4V composites have been manufactured by plasma spraying and subsequent vacuum hot pressing. Two different sizes of Ti-6Al-4V feedstock powders were used for plasma spraying to form matrix. A considerable amount of oxygen was incorporated into as-sprayed Ti matrix during plasma spraying, and consequently caused matrix embrittlement. The use of coarse-sized feedstock powder reduced oxygen contamination, but tended to increase fiber spacing irregularity and fiber strength degradation. Longitudinal tensile strength and ductility of the composites were mainly affected by the matrix oxygen content.
Microstructural Characterization and Plasma Etching Resistance of Thermally Sprayed and Coatings
Baik Kyeong-Ho,Lee Young-Ra 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
In this study, the plasma sprayed and coatings have been investigated for applications of microelectronic components. The plasma sprayed coatings had a well-defined splatted lamellae microstructure, intersplat pores and a higher amount of microcracks within the splats. The plasma sprayed coating had a relatively lower hardness of 300-400Hv, compared to 650-800Hv for coating, and would be readily damaged by mechanical attacks such as erosion, wear and friction. For a reactive ion etching against F-containing plasmas, however, the coating had a much higher resistance than the coating because of the reduced erosion rate of by-products.
가스분무성형 Cu-10Cr 합금의 열적응고거동 및 미세조직
백경호 ( Kyeong Ho Baik ),강희수 ( Hee Soo Kang ),석현광 ( Hyun Kwang Seok ) 대한금속재료학회 ( 구 대한금속학회 ) 2006 대한금속·재료학회지 Vol.44 No.5
The application of spray forming process to the fabrication of highly alloyed Cu-Cr materials has been considered in this study, in order to achieve a fine scale microstructure. Solidification and microstructural evolution of Cu-10Cr alloy during spray forming have been rationalized by quantitative analyses of average enthalpy and liquid fraction in the preform surface layer. The results gave an insight to establish quantitative guidelines for process optimization and to understand microstructural evolution during spray forming. The microstructure of spray formed Cu-10Cr alloy was characterized by an equiaxed cell structure in which smaller sized Cr particles were formed at Cu cell boundaries. In contrast, the ingot-cast billet had a dendritic microstructure comprising coarse primary Cr dendrites and fine Cu-Cr eutectic. The Cr particles had a good thermal stability in the Cu matrix because no significant growth occurred after exposure at elevated temperatures up to 900℃. After hot extrusion, the spray formed Cu-10Cr alloy had a good combination of strength and ductility.