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Lee, H. G,P. Y. Lee,Y. K. Lee,S. J. Kim,H. K. Chung,M. K. Seo,J. K. Park,K. S. Min,W. K. Chang 한국동물생명공학회(구 한국동물번식학회) 2003 Reproductive & developmental biology Vol.27 No.4
The effects of additions/deletions in glycosylated residues of recombinant human EPO (rhEPO) produced in CHO-K1 on their secretion were examined. hEPO cDNA was amplified from human liver mRNA and cloned into the pCR2.1 TOPO. Using overlapping-extension site-directed mutagenesis method, glycosylation sites at 24th, 38th, 83rd, and 126th were respectively or accumulatively removed by substituting its asparagine (or serine) with glutamine. To add novel glycosylation sites, 69 and 105th leucine was mutated to asparagine. Mutant and wild type rhEPO constructs were cloned into the pcDNA3 expression vector with CMV promoter and transfected into CHO cell line, CHO-K1, to produce mutant rhEPO mutant rhEPO proteins. Enzyme-linked immunosorbant assay (ELISA) and Western analysis with monoclonal anti-EPO antibody were performed using supernatants of the cultures showing transient and stable expressions respectively. Addition of novel glycosylation reduced rhEPO secretion dramatically while deletion mutants had little effect except some double deletion mutants (△24/83 and △38/83) and triple mutant (△24/38/83). This fact suggests that not single but combination of changes in glycosyl groups affect secretion of rhEPO in cell culture, possibly via changes in their conformations.
Control of Thermoelectric Properties through the addition of Ag in the Bi0.5 Sb1.5 Te3Alloy
( J. K. Lee ),( S. D. Kim ),( M. W. Oh ),( S. H. Cho ),( B. K. Min ),( H. W. Lee ),( M. H. Kim ) 대한금속재료학회 ( 구 대한금속학회 ) 2010 ELECTRONIC MATERIALS LETTERS Vol.6 No.4
In this study, the thermoelectric properties of the Ag-doped Bi0.5Sb1.5Te3 compounds were investigated in the temperature range from 323 K to 573 K. Ingots were fabricated by a conventional melting process and the powder crushed from ingots was then sintered using a hot-pressing method. The temperature dependence of the Seebeck coefficient and the electrical conductivity of the Ag-doped Bi0.5Sb1.5Te3compound are characteristic of degenerate semiconductors, which is fairly different from the conventional Bi0.5Sb1.5Te3 compound. The power factor (α 2 σ) of the quaternary compound was larger than that of the ternary, which is mainly due to the increase in the electrical conductivity with doping content of Ag. The thermal conductivity was greater than that of the Ag-freeBi0.5Sb1.5Te3compound in the temperature range from 323 K to 523 K. The lattice thermal conductivity showed low values throughout the temperature range. The maximum value of the dimensionless figure of merit (ZT) of the 0.05 wt. % Ag-doped compound and the ternary alloy were 1.2 at 373 K and 0.88 at 323 K, respectively. Each of the maximum peak ZT shifts to a higher temperature region with increases in the doping content of Ag. This is likely due to the control of the lattice thermal conductivity by the twin structure, which had a nano-ordered layer.
마이크로 팩토리를 위한 미세 방전 가공 장치의 해석 및 제어
유병한(B. H. Yoo),김기원(K. W. Kim),김태곤(T. G. Kim),정재원(J. W. Jung),정영훈(Y. H. Jeong),민병권(B-K. Min),이상조(S. J. Lee) 한국생산제조학회 2005 한국공작기계학회 추계학술대회논문집 Vol.2005 No.-
Electrical discharge machining method is a valuable manufacturing method in the microfactory system. In this study, a model-based process analysis and control methods are developed. The electric discharge power simulation and process simulation can be introduced and the optimization of EDM machining condition for the better understanding of electrical discharge phenomena. For the accurate control of machining depth in EDM, a real time control method is developed using plasma pulse counting. As a result, it is demonstrated that the flat machined surface can be obtatined using the developed control method.