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니켈기 자융성 합금 코팅층의 마모거동에 미치는 후열처리 조건의 영향
김균택(K. T. Kim),김영식(Y. S. Kim),오명석(M. S. Oh) 한국동력기계공학회 2006 한국동력기계공학회 학술대회 논문집 Vol.- No.-
This study aims at investigating the effect of heat treatment condition on the dry sliding wear behavior of thermally sprayed Ni-based self-flux alloy coatings. Ni-based self-flux alloy powders were flame-sprayed onto a carbon steel substrate and then heat-treated at 700, 800, 900 and 1000℃ for 30 minutes in a vacuum furnace. Dry sliding wear tests were performed using sliding speed of 0.4 m/s and applied load of 6 N. AISI 52100 ball(diameter 8 ㎜) was used as counterparts. Wear behavior of as-sprayed and heat-treated Ni-based self-flux alloy coatings was studied using a scanning electron microscope(SEM) and X-ray diffraction(XRD). It was revealed that microstructure and wear behavior of thermally sprayed Ni-based self-flux alloy coatings were much influenced by heat treatment condition.
Development of Welding Robot for Welding a Rectangular Welding Line
뇨마안용(M. D. Ngo),충탄람(T. L. Chung),김학경(H. K. Kim),김상봉(S. B. Kim),오명석(M. S. Oh) 한국동력기계공학회 2004 한국동력기계공학회 학술대회 논문집 Vol.- No.-
In this paper, a welding robot to weld a 3D rectangular welding line (3D-RWL) is designed. A simple controller based on backstepping method is proposed to control the end effector of the welding robot tracking a 3D-RWL with a constant velocity. To obtain the controller, the welding robot is modeled in terms of kinematics model in Cartesian coordinate and the tracking errors are defined. The control system is stable in the sense of Lyapunov stability. In the experimental results, the welding robot is operated by 5 DC motors. So the control system is based on the integration of six PIC 16F877's including one for the master and five for the slaver. The master links to the five slaves via 12C communication. The slaves have a function as the servo DC motors. The effectiveness of the proposed controller is proven through simulation and experimental results.
단일항체 칼럼과 고압 액체크로마토그래피에 의한 유전자 조작 사람 알파 인터페론의 분리 및 정제
박희섭,정미영,오명석,고중환,김현수,현형환 ( H . S . Park,M . Y . Jung,M . S . Oh,J . H . Koh,H . S . Kim,H . H . Hyun ) 생화학분자생물학회 1987 BMB Reports Vol.20 No.4
Immunoadsorbent chromatography technique was applied for the efficient purification of Interferon (rIFN-α) from recombinant E. coli. Monoclonal antibody to rIFN-α was purified using protein A-Sepharose CL-4B chromatography from ascites fluid of BALB/c mice which were innoculated with monoclonal hybridoma cell. The purified antibody was coupled to Affigel-10, and used as an immunoadsorbent for IFN. The recombinant E. coli cells were sedimented and cell-opening was done using 6 M guanidine-HCl. It was loaded to the above immunoadsorbent column and then the bound IFN was eluted from the column with 0.2 M acetic acid. As a result of purification, the specific activity of the purified IFN was 2 × 10^8 IU/㎎ protein and the purification fold was 4100. The amino-terminal sequence of purified IFN was exactly identical to that of natural human leukocyte IFN upto 30 amino acid residues except the lst and 29th unidentified amino acid residues. The molecular weight of the purified IFN was estimated to be 18,600 by SDS-PAGE. Since IFN purified by monoclonal antibody column contains IFN dimer up to 15% further purification was done by HPLC gel filtration. The purity of finally-purified IFN monomer was estimated to be more than 99.9% by SDS-PAGE under non-reducing condition. Finally-purified IFN monomer has several pI points (6.12, 6.06, 5.85, 5.58, and 5.30).
박희섭,정미영,오명석,고중환,김현수,현형환,Park, H.S.,Jung, M.Y.,Oh, M.S.,Koh, J.H.,Kim, H.S.,Hyun, H.H. 생화학분자생물학회 1987 한국생화학회지 Vol.20 No.4
유전자 조작된 대장균이 생산하는 알파 인터페론을 단일 항체 칼럼을 사용하여 효과적으로 정제하였다. rIFN-$\alpha$에 대한 항체를 생산하는 단일클론 융합세 포를 쥐(BALB/c)의 복강에 접종하여 얻은 복강액으로부터 Protein A column을 사용하여 항체를 정제하였다. 이 정제된 항체를 Affigel-10에 결합시켜 단일항체 칼럼을 만든 후, 유전자 조각 장균을 6M 구아니딘 (guanidine-HCl)으로 처리 하여 얻은 인터페론 포함 상등액을 통과시켜 인터페론을 정제하였다. 정제된 인터페론 $2{\times}10^8\;IU/mg$ protein의 specific activity를 가졌으며 분자량은 SDS-PAGE에서 18,600이었고 30개까지 이이노산 서열을 분석한 결과 천연의 human leukocyte IFN-$\alpha$의 것과 동일하였다. 비환원 조건에서 SDS-PAGE 한 결과 약 15%의 인터페론 이중체 (Interferon dimer)를 포함 하고 있었다. 이를 제거하기 위해 생리식염수 용액으로 사용하여 HPLC 젤여과를 행하였다. 최종 정제된 인터페론을 비환원 조건에서 SDS-PAGE 한 결과 인터페론 단일체의 순도는 99.9% 이상인 것으로 판명되었으며, 최종 정제된 인터페론은 약 5개의 등전 전위점을 갖고 있다 (pI = 6.12, 6.06, 5.85, 5.58, 5.30). Immunoadsorbent chromatography technique was applied for the efficient purification of Interferon (rIFN-$\alpha$) from recombinant E. coli. Monoclonal antibody to rIFN-$\alpha$ was purified using protein A-Sepharose CL-4B chromatography from ascites fluid of BALB/c mice which were innoculated with monoclonal hybridoma cell. The purified antibody was coupled to Affigel-10, and used as an immunoadsorbent for IFN. The recombinant E. coli cells were sedimented and cell-opening was done using 6 M guanidine-HCl. It was loaded to the above immunoadsorhent column and then the bound IFN was eluted from the column with 0.2 M acetic acid. As a result of purification, the specific activity of the purified IFN was $2{\times}10^8\;IU/mg$ protein and the purification fold was 4100. The amino-terminal sequence of purified IFN was exactly identical to that of natural human leukocyte IFN upto 30 amino acid residues except the 1st and 29th unidentified amino acid residues. The molecular weight of the purified IFN was estimated to be 18,600 by SDS-PAGE. Since IFN purified by monoclonal antibody column contains IFN dimer up to 15%, further purification was done by HPLC gel filtration. The purity of finally-purified IFN monomer was estimated to be more than 99.9% by SDS-PAGE under non-reducing condition. Finally-purified IFN monomer has several pI points (6.12, 6.06, 5.85, 5.58, and 5.30).
단롤법으로 제조한 AISI 310 스테인레스강의 급냉 조직에 관한 연구
최재헌,오명석,조성석,이용호 ( J . H . Choi,M . S . Oh,S . S . J,Y . H . Lee ) 한국열처리공학회 1996 熱處理工學會誌 Vol.9 No.1
Melt-quenching of steels leads to various metallographic effects such as refinement of grain size, extension of the solid solubility of carbon and alloying elements, and is expected to improve the mechanical properties of conventional steels. Furthermore, this technique is a useful method for producing sheet directly from liquid state. And it will lend itself to development as a continuous cast process which offers significant savings in energy and product costs. The purpose of this study is to present the microstructures of melt-quenched austenitic stainless steels. As the results of this study. the morphology of melt-quenched microstructure show that the roll contact area is columnar structure. and the free surface area is dendrite structure. As the line speed increases, the ratio of d_(colunnar)/d_(total) increases from 0.12 to 0.60, but the ribbon thickness decreases from 150㎛ to 30㎛.