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고속화염용사코팅으로 제조된 WC-CoFe 코팅의 기계적 특성에 관한 연구
주윤곤 ( Yun Kon Joo ),조동율 ( Tong Yul Cho ),하성식 ( Sung Sik Ha ),이찬규 ( Chan Gyu Lee ),천희곤 ( Hui Gon Chun ),허성강 ( Sung Gang Hur ),윤재홍 ( Jae Hong Yoon ) 한국열처리공학회 2012 熱處理工學會誌 Vol.25 No.1
HVOF thermal spray coating of 80%WC-CoFe powder is one of the most promising candidate for the replacement of the traditional hard chrome plating and hard ceramics coating because of the environmental problem of the very toxic Cr6+ known as carcinogen by chrome plating and the brittleness of ceramics coatings. 80%WC-CoFe powder was coated by HVOF thermal spraying for the study of durability improvement of the high speed spindle such as air bearing spindle. The coating procedure was designed by the Taguchi program, including 4 parameters of hydrogen and oxygen flow rates, powder feed rate and spray distance. The surface properties of the 80%WC-CoFe powder coating were investigated roughness, hardness and porosity. The optimal condition for thermal spray has been ensured by the relationship between the spary parameters and the hardness of the coatings. The optimal coating process obtained by Taguchi program is the process of oxygen flow rate 34 FRM, hydrogen flow rate 57 FRM, powder feed rate 35 g/min and spray distance 8 inch. The coating cross-sectional structure was observed scanning electron microscope before chemical etching. Estimation of coating porosity was performed using metallugical image analysis. The Friction and wear behaviors of HVOF WC-CoFe coating prepared by OCP are investigated by reciprocating sliding wear test at 25oC and 450oC. Friction coefficients (FC) of coating decreases as sliding surface temperature increases from 25oC to 450oC. (Received October 31, 2011; Revised November 15, 2011; Accepted December 16, 2011)
SKD61과 Radical Nitriding 처리된 SKD61 기판상에 Arc Ion Plating으로 증착된 TiN 박막의 미세구조 및 기계적 특성, 마찰 및 접착력에 관한 연구
주윤곤(Yun-Kon Joo),윤재홍(Jae-Hong Yoon),방위(Wei Fang),장세굉(Shi-Hong Zhang),조동율(Tong-Yul Cho),하성식(Sung-Sik Ha) 한국표면공학회 2007 한국표면공학회지 Vol.40 No.6
TiN coating on tool steel has been widely used for the improvement of durability of tools. In this work, radical nitriding(RN) is carried out on SKD61 at 450℃ for 5 hours in the ammonia gas pressure 2.7×10³ ㎩. The TiN coating is carried out by arc ion plating(AIP) with the process parameters: arc power 150 A, bias voltage ?50 V, coating time 40 minutes and nitrogen gas pressure 4×10³ ㎩. Hardness, elastic modulus, friction coefficient and adhesion of TiN coating on substrates of both TiN/SKD61 and TiN/RN SKD61 coatings are investigated comparatively. The primary crystalline faces of TiN surface are (200) and (111) for TiN/SKD61 and TiN/RN SKD61 respectively. In addition to the primary phase, Fe phase exists in TiN/SKD61 coating, but not in TIN/RN SKD61. The hardness of TiN/RN SKD61 is about 700 Hv, 250 Hv(56%) higher than that of TiN/SKD61 at the near interface of TiN and substrates. At the TiN surface, hardness of TiN/RN SKD61 is 2,149 Hv, 71 Hv(3%) higher than that of TiN/SKD61. The elastic modulus of TiN coating is improved to 26.7 G㎩(6%) by radical nitriding. The adhesion is improved by the RN coating showing no spalling. buckling and chipping on the scratch test track which are shown on the non-RN TiN/SKD61.
옥수수 뿌리에서 굴중성 반응과 에틸렌 생성에 미치는 Phorbol 12-myristate 13-acetate 조절 작용
Yun Ho Jeong(정윤호),Jong-Sik Kim(김종식),Kon-Joo Lee(이건주),Soon Young Kim(김순영) 한국생명과학회 2012 생명과학회지 Vol.22 No.1
암을 유발하는 phorbol ester로 알려진 Phorbol 12-myristate 13-acetate (PMA)는 동물세포에서 신호전달 효소의 하나인 protein kinase C (PKC)를 활성화시킨다. 본 연구에서는 옥수수 일차뿌리에서 PMA가 에틸렌 생성을 통하여 굴중성 반응을 조절하는 효과를 연구하였다. PMA는 8시간 동안 10?? M과 10?⁴ M에서 농도 의존적으로 뿌리 생장과 굴중성 반응을 촉진시켰다. 이러한 촉진 효과는 PKC의 억제제인 staurosporine (STA)에 의해 상쇄되었다. 이 결과는 굴중성 반응이 신호전달 체계에 관여하는 protein kinase C를 통하여 조절될 가능성을 제시하고 있다. 식물호르몬인 에틸렌도 뿌리 생장과 굴중성 반응에 중요한 역할을 한다고 알려져 있다. 에틸렌 생성은 10?? M과 10?⁴ M PMA에 의하여 각각 26%와 37% 증가하였다. PMA는 또한 ACC synthase (ACS) 활성을 촉진시켰다. 또한 이 증가 효과는 STA에 의하여 상쇄되었다. 이 결과는 옥수수 뿌리에서 굴중성 반응은 에틸렌 생성을 거쳐 protein kinase를 통하여 조절될 가능성을 제시하고 있다. Phorbol 12-myristate 13-acetate (PMA), a known tumor-promoting phorbol ester, activates the signal transduction enzyme protein kinase C (PKC) in animal cells. We investigated the effect of PMA on the regulation of gravitropism via ethylene production in primary roots of maize. PMA stimulated root growth and the gravitropic response in a concentration-dependent manner at 10?? M and 10?⁴ Mover 8 hrs. These effects were prevented by treatment with staurosporine (STA), a potent inhibitor of PKC. These results support the possibility that the gravitropic response might be regulated through protein kinases that are involved in the signal transduction system. Ethylene is known to play a role in the regulation of root growth and gravitropism. Ethylene production was increased by about 26% and 37% of the control rate in response to 10?? M and 10?⁴ M PMA, respectively. PMA also stimulated the activity of ACC synthase (ACS), which converts the S-adenosyl-L-methionine (AdoMet) to 1-aminocyclopropane-1-carboxylic acid (ACC) in the ethylene production pathway. These effects on ethylene production were also prevented by STA treatment. These results suggest that the root gravitropic response in maize is regulated through protein kinases via ethylene production.
( Joo Hyun Lim ),( Ji Kon Ryu ),( Yoon Jin Choi ),( Jieun Kwon ),( Ji Yeon Kim ),( Yun Bin Lee ),( Jae Hwan Kim ),( Won Jae Yoon ),( Yong Tae Kim ),( Yong Bum Yoon ) The Editorial Office of Gut and Liver 2013 Gut and Liver Vol.7 No.3
Common bile duct (CBD) cancer is a relatively rare malignancy that arises from the biliary epithelium and is associated with a poor prognosis. Here, we report a case of advanced metastatic CBD cancer successfully treated by chemotherapy with gemcitabine combined with S-1 (tegafur+gimeracil+oteracil). A 65-year-old male presented with pyogenic liver abscess. After antibiotic therapy and percutaneous drainage, follow-up computed tomography (CT) showed an enhanced nodule in the CBD. Biopsy was performed at the CBD via endoscopic retrograde cholangiopancreatography, which showed adenocarcinoma. Additional CT and magnetic resonance imaging showed multiple small nodules in the right hepatic lobe, which were confirmed as metastatic adenocarcinoma by sono-guided liver biopsy. The patient underwent combination chemotherapy with gemcitabine and S-1. After nine courses of chemotherapy, the hepatic lesion disappeared radiologically. Pylorus preserving pancreaticoduodenectomy was performed, and no residual tumor was found in the resected specimen. Three weeks after the operation, the patient was discharged with no complications. Through 3 months of follow-up, no sign of recurrence was observed on CT scan. Gemcitabine combined with S-1 may be a highly effective treatment for advanced cholangiocarcinoma. (Gut Liver 2013; 7:371-376)
마 종근(種根)종류와 크기가 생육 및 수량에 미치는 영향
오윤진,주영희,김정곤,김강권 한국국제농업개발학회 1995 韓國國際農業開發學會誌 Vol.7 No.1
本 試驗은 1991年 農村振興廳 技術協力官室試驗圃場에서 短마의 珠芽 種根 및 珠芽1年生種根들의 크기가 生育 및 收量에 미치는 影響을 검토하고자 遂行하였던 結果는 다음과 같다. 1. 珠芽 生産費 및 收量은 種根種類間에는 珠芽1年生種根>種根>珠芽栽培 順으로 많았으며, 同一種根에서는 種根 크기가 클수록 많았다. 2. 個體當 무게가 2.0gm 以上인 珠芽를 栽培하면 當年에 收量이 慣行收量(2107㎏/10a)의 76% 生産(1067㎏/10a)이 가능하며, 總收量의 66%는 商品바로 판매할 수 있고 나머지 34%는 이듬해에 優良種根으로 利用할 수 있다. 따라서 마의 種根確保 困難時 珠芽 2.0gm. 以上인 것을 栽培하면 當年에 商品마 生産과 더불어 優良種根 確保로 種根購入費 및 勞力節減效果가 크다고 생각된다. 3. 種根形態別로 收量(販賣 可能한 收量) 向上을 위한 種根크기가 種根栽培는 10gm. 以上 珠芽1年生種根栽培는 40gm. 以上의 것을 利用하여야 10a當 2000㎏ 以上의 收量을 기대할 수 있다고 생각된다. The experiment was conducted at International Technical Cooperation Center, RDA in 1991 to determine the effects of seed tubers and sizes on growth and yield in yam(Dioscorea opposite Thurnb.) The aerial tuber, the seed tuber and the seed yam(tuber cultivated one year by the aerial tuber) were transplanted with a planting distance of 70×30㎝ by high ridge cultivation with polyethylen film(PEF) mulching(ridge height: 40㎝). The aerial tubers of aerial part and the total yield were highest in cultivating of seed yams, followed by the cultivation of seed tubers and the cultivation of aerial tubers, and also those production were better as the weight of the seed tubers is high in cultivating within the same seed tubers. The cultivation with aerial tuber which is more than 2.0gm. in fresh weight could be yielded 1,067㎏ per l0a that was the 76% of total yield producted with proventional cultivation (seed tuber : 10gm.) and than the 66% of total yield was the commodity yield, and also the rest(34%) can be used by the good seed tuber next year. Thus, in case that farmers have difficulty in prepering seed tuber, the cultivation with aerial tuber(more than 2.0gm. in fresh weight) in place of seed tuber can be expected production of marketing yield as well as he cost down for purchasing seed tuber. Finally, the sizes of seed tuber and seed yam for high yielding in yam were more than 10gm. and 40gm. in fresh weight, respectively.
마 괴근(塊根)의 절편(切片)재배와 크기가 출아 및 수량에 미치는영향
오윤진,주영희,김정곤,김강권 한국국제농업개발학회 1993 韓國國際農業開發學會誌 Vol.5 No.1
The experiment was conducted at International technical cooperation center, RDA in 1991 to determine the effect of estt types and sett sizes on sprouting and yield of yam (Dioscorea opposita Thumb.). In general, spiouting rate of head sett was remarkably higher than that of middle and tail setts, but e was not significantly different in sett sizes. The growth and development in cultural media and yield of aerial tuber in field were better as the sett type is upper part of tuber and also as the weight of sett size is greater. There were not significantly different in tube length and tuber diameter in sett types and sett sizes. Yield was highest in the head sett followed by middle sett and tail sett within the same sett sizes, and also was highest in 40gm of sett size followed by 20gm and 10㎎ of sett size within the same sett types 40gm size of head sett was showed highest yield of the 2,799Kg per 10a among the reatments. The results suggest that head sett of tuber is possible to useing by seed yam without any treatments before seeding, but middle and tail sett of tuber are needed to some treatments for earlier and more rapid sprouting before seeding. Sett size of head and middle setts for high yieldig was the 20gm, but that of tail sett was 40㎎. Key words : Cultural media, Sprouting, Sett type, Sett size, Yield, Yam.