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자전연소합성법으로 제조한 여러 가지 탄화물의 모폴로지 및 그 형성 메카니즘
윤존도,방환철 경남대학교 신소재연구소 1998 論文集 Vol.10 No.-
자전연소합성법(SHS)을 이용하여 탄소섬유와 지르코늄, 니오븀 및 몰리브데늄 원료분말로부터 섬유상 탄화물의 합성을 시도하였다. 합성된 탄화물의 미세구조관찰 결과 ZrC와 NbC는 속이 빈 섬유상이 Mo2C는 응융물층이 형성되었음을 알수 있었다. 자전연소 합성법으로 합성된 SiC, B4C, WC, ZrC, NbC 및 Mo2C 탄화물의 모폴로지 분석을 통하여, 탄화물의 형상을 크게 섬유상 과 비섬유상의 2가지로 분류하였다. 탄화물의 형상은 원료성분의 융점, 확산속도, 탄화물의 융점 및 단열온도와 관계가 있었으며, 각 섬유상 탄화물에 대한 형성 메카니즘을 제시하였다. Fabrication of fibrous carbides was attempted by self-propagating high temperature synthesis using carbon fibers and elementary powders(Zr. Nb. Mo). It was found that ZrC and NbC had fiber forms but Mo₂C did not. Synthesized carbides(SiC. B₄C. WC. ZrC. NbC. Mo₂C) were found to have two types of morphologies : ① fibrous shape(SiC. ZrC. NbC. B₄C). and ② non-fibrous shapet(WC. Mo₂C). It was suggested that shape of synthesized carbides were determined by the difference in the diffusion rates between metals and carbon in carbides, and existence of liquid phase during the reaction.
윤존도,방환철 慶南大學校 附設 工業技術硏究所 1998 硏究論文集 Vol.15 No.3
자전연소 합성법(SHS)을 이용하여 섬유상 TiC를 합성할 때 섬유형성 기구를 분석하였다. TiC-C공정온도인 2776℃를 임계로하여 공정온도 이상에서는 액상이 안정하여 탄소섬유가 녹고 TiC 섬유가 형성되지 않으나, 공정온도 이하에서는 고상 C와 TiC가 안정하여 TiC 섬유가 잘 형성되는 것으로 분석되었으며 이는 실험결과를 잘 설명하고 있다. 희석제로 TiC를 30무게% 첨가하였을 때 섬유상 TiC가 잘 형성되었다. 합성된 TiC 섬유는 내부에 속이 비어 있었는데 이는 TiC 내에서는 C와 Ti의 확산속도 차이와 C가 TiC로 변화할 때의 몰부피로 설명되었다. Forming mechanism of fibrous TiC during self-propagating high temperature synthetic reaction was analyzed and suggested. It was revealed that critical temperature for the stable fiber formation was not the melting point of TiC, but the eutectic reaction temperature of TiC and C. The explanation was consistent with the experimental results. Optimum amount of diluent addition was determined to be 30%. Synthesized fibers were found hollow tube-like. The morphology was explained by the diffusion rates of C and Ti in TiC, and by the molar volume change of C during the reaction.
윤동우,오성남,김갑일,손영익,임승철,강환일 明知大學校 産業技術硏究所 2007 産業技術硏究所論文集 Vol.26 No.-
In addition to accurate position and velocity control, force control is necessary for a successful robot operation. In this paper, we have designed a simple robot gripper using a DC motor. For its force control, a current feedback control law is presented without using additional force sensors. Experimental results prove the effectiveness of the proposed control law. A digital controller is also developed with a TMS320LF2406 processor.
급성골수백혈병에 대한 관해유도화학요법 후의 Granulocyte Colony-stimulating Factor의 효과
윤환중,최지영,전의건,길준영,조덕연,김삼용 충남대학교 의과대학 지역사회의학연구소 1993 충남의대잡지 Vol.20 No.2
Granulocyte colony-stimulating factor(G-CSF) have been shown to hasten the recovery of neutropenia following anti-cancer chemotherapy. There are controversial opinions on the use of G-CSF in acute myelogenous leukemia(AML) because clonogenic studies have shown that G-CSF stimulates leukemic colonies as well as granulocyte colonies. In this study, we evaluated the effectiveness and safety of recombinant human G-CSF after induction chemotherapy with DAV regimen(Ara-C 100mg/㎡ day 1-8, Doxorubicin 45mg/㎡ day 3-5, VP-16 100mg/㎡ day 6-8) in 9 patients with AML. G-CSF therapy(200 ㎍/㎡/day) was begun 2 days after the end of chemotherapy and continued for 10 days. 17 AML patients who recieved the same chemotherapy before the onset of this study were used as historical control. G-CSF shortened the duration of granulocytopenia (less than 500/㎣) significantly (13 vs 23 days, p<0.001), but it had no effect on platelet recovery. Although the incidence of febrile episodes was almost the same, the duration of febrile episodes was shorter in the group treated with G-CSF( 5 vs 12 days, p=0.03). There was no evidence that G-CSF accelerated the regrowth of leukemic cells and the complete remission rates between the 2 groups were not different. These results show that G-CSF accelerates the recovery of granulocytopenia and shortens the febrile days after chemotherpy in patients with AML, without affecting the regrowth of leukemic cells.