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윤형주,조영희,Yoon, Hyung-Joo,Cho, Young-Hee,Baer, Boris 한국응용곤충학회 2007 한국응용곤충학회지 Vol.46 No.1
뒤영벌 인공수정기를 본 연구에서 처음으로 개발하였다. 개발된 뒤영벌 인공수정기는 자리잡기용관, 이송용관, 고정관, 머리받침대, 생식기 탐침기 등으로 구성되어 있으며, 여왕벌의 인공수정에 따른 스트레스 및 생식기의 손상을 최소화하도록 고안되었다. 특히 인공수정기의 조정핸들은 지렛대 원리를 이용하여 미세하고, 정확하고, 신속하게 조작할 수 있다. 본 인공수정기를 이용하여 인공수정 시 수정 성공률은 90% 이상이었다. 따라서 이 인공수정기는 우량형질의 뒤영벌 육종 및 보존에 효율적으로 이용되어질 수 있을 것이다. An artificial insemination instrument of bumblebee queens was firstly developed. This instrument consists of location tube, transfer tube, holding tube, head product, and probe apparatus for reproductive tract etc. This instrument was designed to minimize stress and damage of reproductive tract of bumblebee queens. The regulator handle apparatus in artificial insemination instrument was used the principle of lever, that manipulates easy, accurate and rapid insemination of bumblebee queens. By using this instrument, the insemination rate was over 90%. This instrument will be useful for the breeding and conservation of excellent character of bumblebees.
경사제트에 따른 충돌제트 / 유출냉각에서 열 / 물질전달 특성
홍성국(Sung Kook Hong),이동호(Dong-Ho Rhee),조영희(Hyung Hee Cho) 대한기계학회 2008 大韓機械學會論文集B Vol.32 No.4
An experimental investigation was conducted to investigate the heat/mass transfer for impingement/effusion cooling system with inclined jet. Jets with inclined angle of 60 are applied to impingement/effusion cooling. At the jet Reynolds number of 10,000, the experiments were carried out for blowing ratios ranging from 0.0 to 1.5. The local heat/mass transfer coefficients on the effusion plate are measured using a naphthalene sublimation method. The result indicates that the inclined jet causes the non-uniform and low heat/mass transfer compared to the vertical jet. At stagnation region, the peak position is shifted from the geometrical center of injection hole due to Coanda effect and its level is higher than that of vertical jet due to increase in turbulence intensity by steep velocity gradient near the stagnation region. Further, the secondary peak region disappears because the interaction between adjacent wall jets weakens. When the initial crossflow occurs, the distorted heat/mass transfer pattern appears. As the blowing ratio (crossflow rate) increases, the heat/mass transfer distributions become similar to those of the vertical jet. This is because the effect of crossflow is dominant compared to that of inclined jet under high blowing ratio (M≥1.0). At low blowing ratio (M≤0.5), averaged Sh value is 10% lower than that of vertical jet, whereas its value at high blowing ratio (M≥1.0) is similar to that of vertical jet.
유출유동을 가진 정사각유로 내 열전달 향상을 위한 경사진 요철 최적설계
이현(Hyun Lee),김경민(Kyung Min Kim),이동현(Dong Hyun Lee),조영희(Hyung Hee Cho) 대한기계학회 2008 大韓機械學會論文集B Vol.32 No.4
In the present study, the second order response surface method (RSM) is carried out to get optimum thermal design for enhancing heat transfer in a square channel with bleed flow. The RSM is used as an optimization technique. To calculate the heat transfer, RNG k-epsilon model and enhanced wall function are used. To design optimum rib turbulators, two design variables such as attack angle of rib (α) and rib pitch-to-rib height ratio (p/e) are optimized. In these analyses, the channel inlet Reynolds number was fixed at 10,000 in both non-bleeding and bleeding cases. The response surfaces of two design variables are constructed in cases with and without bleed flow. As a result, the optimum (or highest) heat transfer values are almost the same in ranges of two cases with and without bleed flow. However, the friction losses in the case with bleed flow are lower than those without bleed flow.