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          • 높은 회전성능(100°)을 가지는 초정밀 위치결정용 마이크로 병렬기구 플랫폼의 개발

            윤용하(Yongha Yoon),강득수(Deuksoo Kang),서태원(Taewon Seo),김홍석(Hongseok Kim),성태종(Taijong Sung),김종원(Jongwon Kim) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월

            This paper presents a micro-positioning platform based on the unique parallel mechanism recently developed by the authors. The platform has a meso-scale rectangular shape whose size is 20 × 23 ㎜. The stroke is 5 ㎜ for both the x- and yaxis and 100 degrees for the α-axis(the rotational axis along the x-axis). The platform is actuated by the three sets of twostage linear actuators: a linear motor for rough positioning and a piezo actuator for fine positioning. The platform is already assembled. Experimental results of the positioning measurements and control performance are presented.

          • Transforming growth factor ${\beta}_1$이 배양랫트 신경교세포의 성장 및 생화학적 변화에 미치는 영향

            김용식,윤용하,박난향,박찬웅,Kim, Yong-Sik,Youn, Yong-Ha,Park, Nan-Hyang,Park, Chan-Woong 대한약리학회 1994 대한약리학잡지 Vol.30 No.2

            Recent evidence indicates that glial cells have a wide range of funtions which are critical for maintaining a balanced homeostatic environment in the central nervous system(CNS) peripheral nervous system(PNS). Morever, astrocytes are known to participate in the tissue repair and neuroimmunologic events within the CNS through many kinds of growth factors and cytokines. We investigated the effect of $TGF\;{\beta}_1$, on the growth and biochemical changes of rat glial cells in culture. The proliferative effect was determined by $^3H-thymidine$ uptake and the double immunostain with anti-cell-specific marker and anti-Bromodeoxyuridine(BrdU) antibody. To check the effect of biochemical changes we compared the amounts of glial fibrillar acidic protein(GFAP) and the activity of glutamine synthetase(GS) in astrocyte. And the amounts of myelin basic protein and the activity of 2',3'-cyclic nucleotide phosphohydrolase(CNPase) were measured in oligodendrocyte and the amounts of peripheral myelin in Schwann cell. When $TGF\;{\beta}_1$, was treated for 2 days with cultured glial cell, $TGF\;{\beta}_1$, decreased the $^3H-thymidine$ uptake and proliferation index of double immunostain of astrocytes, which indicates the inhibition of astroglial DNA synthesis, but stimulated the growth of Schwann cell. Also, $TGF\;{\beta}_1$, decrease the GS activity and increased the amounts of GFAP in astrocyte. In the case of Schwann cells the amounts of peripheral myelin was increased when treated with $TGF\;{\beta}_1$. However, $TGF\;{\beta}_1$, didn't show any effect on the proliferation and biochemical changes in oligodendrocyte. These results suggest that $TGF\;{\beta}_1$, might have a critical action in the regulation of proliferation and biochemical changes in glial cells, especially astrocyte.

          • 랫트 배양 신경교세포의 성장 및 분화에 대한 Cytokine의 효과

            김혜경,윤용하,강신정,박찬웅,김용식,Kim, Hae-Kyoung,Youn, Yong-Ha,Kang, Shin-Chung,Park, Chan-Woong,Kim, Yong-Sik 대한약리학회 1996 대한약리학잡지 Vol.32 No.2

            '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.

            The effects of cytokines on the growth and differentiation of glial cells in culture were evaluated to confirm that cytokines could modify the number and function of glial cells. Proliferation of glial cells was determined by the $^3H-thymidine$ uptake and the double immunostain with anti-cell specific marker and anti-bromodeoxyuridine(BrdU) antibody. To check the effect on the differentiation of glial cells, the amount of glial fibrillar acidic protein(GFAP) and the activity of glutamine synthetase(GS) were measured in astrocytes. And also the amounts of myelin basic protein(MBP) and the activity of 2',3'-cyclic nucleotide phosphohydrolase(CNPase) were measured in oligodendrocytes. Among the cytokines used, only interleukin-$1{\beta}(IL-1{\beta})$ stimulated the growth of type 1 and type 2 astrocyte as well as 0-2A precursor cell. When the functional changes in these glial cells by cytokines were tested, $IL-1{\beta}$ did not increase GFAP content in type 1 and type 2 astrocyte, but $IL-1{\beta}$ increased GS activity in type 1 astrocyte, and slightly decreased this enzyme activity in type 2 astrocyte. Also interleukin-2(IL-2) and $interferon-{\gamma}$ $(IFN-{\gamma})$ inhibited the activity of GS in type 1 and type 2 astrocyte. On the other hand, all cytokines used did not modify the growth and differentiation in oligodendrocytes. From these results we could suggest that $IL-1{\beta}$ increases the growth of type 1 and type 2 astrocyte and also promotes the development for 0-2A precursor cell to type 2 astrocyte.

          • 풍력 시스템 하중 절감을 위한 피치 제어에 관한 연구

            김성호(Kim, Sung-Ho),윤용하(Yoon, Yong-Ha),이현주(Lee, Hyun-Joo),최원호(Choi, Won-Ho),이승구(Lee, Seung-Kuh) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.06

            This paper deals with a pitch control for reducing load of the wind turbine system. To make a model of the wind turbine system, the Momentum Theory and Blade Element Theory are used. Considering wind shear, wind model was also built. Due to a difference of the wind speed between upper parts and lower parts of the sweep area, overturning moment of the wind turbine is generated. So, in this paper through analyzing of the system model of the wind turbine, a control algorithm which was able to achieve both maintaining power and reducing overturning moment was proposed. Using matlab simulink, controller performance was verified.

          • Transforming growth factor β<sub>1</sub>이 배양랫트 신경교세포의 성장 및 생화학적 변화에 미치는 영향

            김용식(Yong Sik Kim),윤용하(Yong Ha Youn),박난향(Nan Hyang Park),박찬웅(Chan Woong Park) 대한약리학회 1994 대한약리학잡지 Vol.30 No.2

            '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.

            Recent evidence indicates that glial cells have a wide range of funtions which are critical for maintaining a balanced homeostatic environment in the central nervous system(CNS) peripheral nervous system(PNS). Morever, astrocytes are known to participate in the tissue repair and neuroimmunologic events within the CNS through many kinds of growth factors and cytokines. We investigated the effect of TGF β<sub>1</sub>, on the growth and biochemical changes of rat glial cells in culture. The proliferative effect was determined by <sup>3</sup>H-thymidine uptake and the double immunostain with anti-cell-specific marker and anti-Bromodeoxyuridine(BrdU) antibody. To check the effect of biochemical changes we compared the amounts of glial fibrillar acidic protein(GFAP) and the activity of glutamine synthetase(GS) in astrocyte. And the amounts of myelin basic protein and the activity of 2 ,3 -cyclic nucleotide phosphohydrolase(CNPase) were measured in oligodendrocyte and the amounts of peripheral myelin in Schwann cell. When TGF β<sub>1</sub>, was treated for 2 days with cultured glial cell, TGF β<sub>1</sub>, decreased the <sup>3</sup>H-thymidine uptake and proliferation index of double immunostain of astrocytes, which indicates the inhibition of astroglial DNA synthesis, but stimulated the growth of Schwann cell. Also, TGF β<sub>1</sub>, decrease the GS activity and increased the amounts of GFAP in astrocyte. In the case of Schwann cells the amounts of peripheral myelin was increased when treated with TGF β<sub>1</sub>. However, TGF β<sub>1</sub>, didn t show any effect on the proliferation and biochemical changes in oligodendrocyte. These results suggest that TGF β<sub>1</sub>, might have a critical action in the regulation of proliferation and biochemical changes in glial cells, especially astrocyte.

          • MPTP와 대사물인 $MPP^+$의 도파민 신경세포에 대한 독성효과에 관한 연구

            김용식,박찬웅,윤영란,윤용하,Kim, Yong-Sik,Park, Chan-Woong,Yoon, Young-Ran,Youn, Yong-Ha 대한약리학회 1995 대한약리학잡지 Vol.31 No.2

            Dissociated cell cultures from rat embryonic ventral mesencephalon were used to evaluate the mechanisms of $MPP^+$ neurotoxicity. The cells were treated with MPTP or $MPP^+$ and the viability of the cells was assessed biochemically; tyrosine hydroxylase (TH) immunoreactivity, protein, intracellular ATP and lactate content and lipid peroxidation. Also the generation of the intracellular oxidants was measured after loading 2', 7‘-dichlorofluorescin diacetate to the cells. When cultures were exposed to 0.1 mM $MPP^+$, at 2 hour incubation lactate was significantly accumulated in the cells and then the intracellular ATP content and TH immunoreactivity were decreased dose- and time-dependently. But, malondialdehyde as an index for lipid peroxidation was not changed even though the generation of the intracellular oxidants was stimulated by the addition of $MPP^+$. On the other hand, 1 mM MPTP significantly reduced the TH immunoreactivity at 24 hour exposure without any change in the intracellular A TP, lactate and MDA content until 6 hour exposure. And also MPTP inhibited the generation of the intracellular oxidants from control cells and $MPP^+$ exposed cells. These results indicate that cytotoxicity of $MPP^+$ is mediated by inhibiting the mitochondrial energy metabolism rather than generating the intracellular oxidants. And MPTP would have direct action in addition to conveting to the toxic metabolite, $MPP^+$ to exert the toxicity on the dopaminergic neurons.

          • MPTP와 대사물인 MPP<sup>+</sup>의 도파민 신경세포에 대한 독성효과에 관한 연구

            김용식(Yong Sik Kim),박찬웅(Chan Woong Park),윤영란(Young Ran Yoon),윤용하(Yong Ha Youn) 대한약리학회 1995 대한약리학잡지 Vol.31 No.2

            '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.

            Dissociated cell cultures from rat embryonic ventral mesencephalon were used to evaluate the mechanisms of MPP<sup>+</sup> neurotoxicity. The cells were treated with MPTP or MPP<sup>+</sup> and the viability of the cells was assessed biochemically; tyrosine hydroxylase (TH) immunoreactivity, protein, intracellular ATP and lactate content and lipid peroxidation. Also the generation of the intracellular oxidants was measured after loading 2 , 7‘-dichlorofluorescin diacetate to the cells. When cultures were exposed to 0.1 mM MPP<sup>+</sup>, at 2 hour incubation lactate was significantly accumulated in the cells and then the intracellular ATP content and TH immunoreactivity were decreased dose- and time-dependently. But, malondialdehyde as an index for lipid peroxidation was not changed even though the generation of the intracellular oxidants was stimulated by the addition of MPP<sup>+</sup>. On the other hand, 1 mM MPTP significantly reduced the TH immunoreactivity at 24 hour exposure without any change in the intracellular A TP, lactate and MDA content until 6 hour exposure. And also MPTP inhibited the generation of the intracellular oxidants from control cells and MPP<sup>+</sup> exposed cells. These results indicate that cytotoxicity of MPP<sup>+</sup> is mediated by inhibiting the mitochondrial energy metabolism rather than generating the intracellular oxidants. And MPTP would have direct action in addition to conveting to the toxic metabolite, MPP<sup>+</sup> to exert the toxicity on the dopaminergic neurons.

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