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마이크로 채널 내부에서의 액적의 쌍안정성과 이를 활용한 유동 제어
이범준(Beomjoon Lee),유정열(Jung Yul Yoo) 한국가시화정보학회 2010 한국가시화정보학회지 Vol.8 No.4
We demonstrate the droplet bistability in a microchannel which has two symmetric necks that operate as capillary valves. It is shown that there are certain flow conditions, determined by droplet velocity and droplet size, to achieve bistability. Droplet bistabililty allows simple but precise control of droplet at a bifurcation channel. Therefore, by an appropriate channel design to induce droplet bistability, we can distribute droplets at a junction passively in the manner of perfect alternation and perfect switching in the choice of the outlets.
한국 홍삼과 중국 홍삼의 경구 투여가 흰쥐의 림프구 증식과 Cytokine에 미치는 영향에 대한 비교 연구
이범준(Lee Beomjoon),허홍(Heo hong),오세춘(Oh sechoon),류재환(Lew jaehwan) 고려인삼학회 2008 Journal of Ginseng Research Vol.32 No.3
Red ginseng is a medicinal herb widely used in East-Asia for a long time. Recently there have been a lot of studies about the effect of red ginseng on the immune responses. We investigated the differences between Korean red ginseng and Chinese red ginseng in the lymphocyte proliferation and cytokine production. The rats were divided into 3 groups, KRG(Korean Red Ginseng) group, CRG(Chinese Red Ginseng) group, and the Control group. Experimental groups were administered with Korean and Chinese red ginsengs for three months respectively. Then we obtained the lymphatic cells from spleen and compared the ability of KRG on the lymphocyte proliferation and the cytokine production after mitogen-stimulated culture to CRG. The proliferation of lymphocyte and level of IL-1α were significantly increased only in KRG group. There were significant increases in the level of INF-γ in both KRG and CRG groups. There were no significant differences in the level of IL-2 and TNF-α. These results indicate that KRG can induce infection-relevant immune responses much faster and higher than CRG. Furthermore, functional activation of CD8+ T-cell may be activated by red ginsengs.
마이크로 채널 내부에서의 액적의 쌍안정성과 이를 활용한 유동 제어
이범준(Beomjoon Lee),유정열(Jung Yul Yoo) 한국가시화정보학회 2010 한국가시화정보학회 학술발표대회 논문집 Vol.2010 No.11
We demonstrate the droplet bistability in a microchannel which has two symmetric necks that operate as capillary valves. It is shown that there are certain flow conditions, determined by droplet velocity and droplet size, to achieve bistability. Droplet bistabililty allows simple but precise control of droplet at a bifurcation channel. Therefore, by an appropriate channel design to induce droplet bistability, we can distribute dropletsat a junction passively in the manner of perfect alternation and perfect switching in the choice of the outlets.