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PFA / Silica 유-무기 복합체의 제조 및 표면특성
범정철,하종욱,박인준,이수복 한국공업화학회 2003 응용화학 Vol.7 No.1
Poly(perfluoroalkyl acrylate)(PFA) / silica composites having different silica size were prepared by surface polymerization. In this study, surface characterizations of PFA/silica composites were done by HR-TEM(High Resolution Transmission Microscopy), contact angle measurement, sliding angle measurement, surface roughness measurement, and the relationships between the sliding angle and the contact angle were investigated. In the highly hydrophobic region, the sliding angles of water droplets decreased with increasing contact angle. Their surface free energies were calculated with contact angle data by geometric mean approximation. The composites with super water repellent and sliding could be obtained with contact angle of above 150。and sliding angle of below 10。to water droplets. The ultimate value of surface free energies of the composites reached below ca. ldyn/cm.
표면중합을 이용한 초발수 복합입자의 제조 및 표면특성 : 중합시간의 영향 The Effect of Polymerization Time
범정철,하종욱,박인준,김정훈,이수복,ShiYuan, Cheng 한국공업화학회 2003 응용화학 Vol.7 No.2
This study investigates the preparation of poly(perfluoroalkyl acrylate)[PTA]/silica composite particles by surface polymerization and their characteristics according to surface polymerization time. The particles were prepared by "grafting-from" technique by immobilizing self-assembled initiator and surface radical polymerization from silica particle surface. Characterization was done by contact angle and sliding angle measurements, surface roughness measurement and surface free energy estimation Contact angle were inversely proportion to sliding angle. Graft density(GD) and contact angle of composites increased according to polymerization time. On the other hand, surface free energy and sliding angle were decreased according to increment of polymerization time.
Poly(perfluoroalkyl acrylate)/Silica 나노복합체의 표면이행성 연구
범정철,하종욱,이광원,박인준,소원욱,이수복 한국공업화학회 2003 응용화학 Vol.7 No.2
Surface migration of Poly(perfluoroalkylethyl acrylate)(PFA)/silica nanocomposites added in poly(methylmethacrylate()(PMMA) was investigated by comparing before and after annealing. In this study, surface migration characterizations of PFA/silica composites were measured by SEM(Scanning Electron Microscopy) and contact angle measurement. Their surface free energies were calculated with contact angle data by geometric mean approximation. The contact angles were increased and the surface free energies were decreased, according to increasing the graft density of nanocomposites and decreasing the concentration of PMMA, respectively. It was confirmed that PFA/silica nanocomposites were successfully migrated toward the surface of the PMMA film.
재조합 대장균의 고농도 유가식 배양에 의한 인체 Granulocyte-Colony Stimulating Factor 생산
김범수,유미진 建陽大學校 1999 建陽論叢 Vol.- No.7
Fed-batch fermentation of recombinant Escherichia coli harboring the gene encoding mature human granulocyte-colony stimulating factor (hG-CSF) fused to the gene for the pectate lyase B (pelB) signal peptide of Erwinia caratovora was performed. The fusion protein, pelB-hG-CSF, was produced at a concentration of ca. 1.7 g/L in an inclusion body form.
D8S210 유전자 과변이부위의 클로닝과 한국인에서 집단유전학적 분석을 통한 법의학적 활용성에 관한 연구
한지수,한길로,염범우,황적준 大韓法醫學會 1997 대한법의학회지 Vol.21 No.2
A multi-locus probe. called pHK-450. detecting multiple variable DNA fragments, was constructed by cloning of the 450 bp fragments into pCR?? vector, which could be obtained from amplification of the variable region of the D8S210 locus of human genome with a primer set of UF1. UR1, and UR2. The sequence data shows that the variable region is entirely G-C rich on one strand consisting of tetranucleotide repeat unit (GGAA)n at both margins and internally diversed regions with simple irregular repeat units of GGAA, GGAG, or GGGAA. The genetic complexixty of the resulting individual-specific DNA patterns was investigated by studying a Korean pedigree(both parents and 10 children). HaeIII and HinfI-generated DNA fragments are inherited to their children in a Mendelian manner with segregation ratio of 1:1.05 and 1:1.14. respectively. In the HinfI-digested genomic DNAs, the segregation of up to 25 variable DNA fragments from both parents could be analysed in a single sibship. Most of these variable DNA fragments detected by pHK-450 probe are not paired as allele, which suggests that they may be derived from 23 heterozygous loci. In the HaeIII-digested genomic DNA, 26 variable DNA fragments are segregated from both parents to 10 children. Excluding one allelic and three linked DNA fragments, 22 out of 26 scored DNA fragments may be derived from 23 hetrozygous loci. To determine the variability of DNA fragments, DNA samples from 113 unrelated Korean were digested with HinfI and hybridized using pHK-450 probe. Pairwise comparisons of individual variable DNA fragments show that the polymorphic patterns were highly specific to an individual. The mean probaility(X) that fragments in A individual is present in B individual is 0.0337. From the degree of maxiaml sharing, band approximate estimates of mean allele frequency and homozygosity is calculated being 0.187 and the mean heterozygossity is 89.69%. For pHK-450 probe, the probability that all 10 resolved DNA fragments in the 5-30 kb size range in an individual A are also present in a second unrelated individual B is (0.337)?? or 7.1 X 10??
모수원,김창범 국제무역학회 2003 국제무역연구 Vol.9 No.1
한국경제는 외환위기 이후 경제개방의 확대에 따라 대외여건의 변동에 상당히 취약한 면을 보이고 있으며, IT산업의 비중확대로 IT경기가 경제에 미치는 영향이 확대되어 IT품목의 수출회복 없이는 경기회복을 기대할 수 없는 실정이다. 그러나 최근 세계경기의 침체와 수요감소로 IT품목의 수출은 큰 폭으로 감소한 반면 비IT품목의 수출은 상대적으로 양호하여 역양극화가 이루어지고 있다. 이에 따라 본고는 반도체와 철강제품의 수출구조를 분석하여, IT제품의 수출이 세계경기와 환율변동에 대해 장기에 걸쳐 더 큰 영향을 받으며, 특히 세계경기변동에 민감하게 반응한다는 점을 보인다. 또한 세계시장에서 공급과잉과 같은 불균형 요인에 대해 우리나라 IT산업의 적응능력이 상당히 낮다는 점도 밝힌다. The purpose of this study is to estimate and analyse the export structure of IT and non-IT products. We employ Engle and Granger two-step cointegration technique, Johansen's multivariate cointegration methodology and GPH test, since the model must be stationary to avoid the spurious results. The empirical results show that our model is stationary as well as mean-reverting. This paper also applies variance decompositions and impulse-response functions to get additional information regarding the responses of the export volumes of IT and Nor-IT products to the shocks in world business and real effective exchange rate. The results indicate that while both IT and non- IT products respond positively to the shocks and then decay very slowly, the responses of the former last longer and greater than those of the latter.
환경친화적인 무기/유기 Core-Shell의 제조에 관한 연구
설수덕,임재길,임종민,권재범,이내우 한국안전학회 2004 한국안전학회지 Vol.19 No.1
Composite particles using inorganic and organic chemicals were synthesized and the results of those reaction were compared to variation of temperature and agitation speed in presence of CaCO₃ which was adsorbed SDBS. Also the synthesises were optimized according to conversion rate of composite particles. In inorganic/organic core-shell composite particle polymerization, CaCO₃ adsorbed by 0.5wt% surfactant SDBS was prepared initially and then core CaCO₃ was encapsulated by sequential emulsion polymerization using MMA at the addition of APS 3.16X 10^(-3)mo1/L to minimize the coagulated PMMA particle itself during MMA shell polymerization. Encapsulated PMMA on CaCO₃ as inorganic/organic core-shell particles was verified by Fr-IR and DSC analysis. It was found that the CaCO₃ was very well encapsulated by PMMA as shell. The surfaces were distinctly found as spindle shape and broad particle distribution after capsulation.
재조합 대장균에 의한 Poly(3-hydroxybutyric acid)의 생산
김범수 建陽大學校 1994 建陽論叢 Vol.- No.3
A recombinant Escherichia coil strain XLI-Blue (KS) harboring the poly(3-hydroxybutyric acid) [P(3HB)] biosynthesis genes from Alcaligenes eutrophus was used to produce P(3HB) by pH-stat fed-batch culture in complex medium. Intial glucose concentration for optimal growth was found to be 20 g/L from a series of flask culture. A final P(3HB) concentration of 89 g/L could be obtained after 42 h of cultivation. The pH-stat fed-batch culture of recombinant E. coli K12 (pSYL 104) using defined medium was not suitable for efficient production of p(3HB) due to the formation of acetic acid. Exponential feeding fed-batch culture of E. coli K12 (pSYL 104) achieved high cell concentration (101 g/L) by controlling the specific growth rate as low as 0.1 h?. However, the P(3HB) content was very low because of the different conditions for cell growth and P(3HB) production.
김용범,강수정,한상문 서울산업대학교 산업대학원 1999 大學院論文集 Vol.6 No.-
본 연구에서는 키토산을 담체로하고 5가지 다른 방법에 의해 단백질 가수분해 효소인 trypsin을 선정하여 효율적인 효소고정화법을 개발하고자하였다. 비교한 효소고정화 방법으로, 먼저 가교제의 변화로서 glutaraldehyde와 hexamethylenediisocyanate를 비교였고, 다음으로 프로세스의 변화로서 ⅰ)chitosan bead에 효소를 흡착한 후 glutaraldehyde로 가교하는 방법, ⅱ)chitosan bead에 효소를 흡착한 후 hexamethylenediisocyanate로 가교하는 방법, ⅲ)chitosan과 효소를 혼합하여 bead화하고 glutaraldehyde로 가교하는 방법, ⅳ)chitosan bead를 glutaraldehyde로 1차 가교 하고 효소를 흡착한 후 다시 glutaraldehyde로 2차 가교하는 방법, ⅴ)chitosan bead에 효소 흡착 후 glutaraldehyde로 가교 처리하여 NaOH로 처리하는 방법등으로 비교하여 ⅲ>ⅴ>ⅳ>ⅰ>ⅱ 의 순으로 아미노산 생성효율을 확인하므로써 보다 효율 높은 효소고정화법을 모색하였다. 가교제의 종류에서는 glutaraldehyde가 더 유리하였고, 고정화 가교방법에서는 chitosan과 효소를 미리 혼합하여 bead화한 다음 가교한 것이 기타 다른 방법들에 비해서 고정화 효율이 가장 우수함을 확인하였다. More effective methods for immobilization of enzymes(trypsin) were examined with chitosan beads, through comparison of several different immobilization methods. The methods applied in this experiment are: Firstly with different crosslinking agents : glutaraldehyde and hexamethylenediisocyanate. Secondly with different processes: ⅰ) Adsorption of enzyme on the beads, then crosslinking with glutaraldehyde. ⅱ) Adsorption of enzyme on the beads, then crosslinking with hexamethylenediisocyanate. ⅲ) Mixing chitosan with enzyme, then beads formation followed by crosslinking with glutaraldehyde ⅳ) Treatment with glutaraldehyde, then enzyme adsorption on the beads followed by crosslinking with glutaraldehyde. ⅴ) Adsorption of enzyme on the beads and then crosslinking with glutaraldehyde followed by treatment with 0.01N-NaOH aq. solution The order of superiority is ⅲ>ⅴ>ⅳ>ⅱ>ⅰ described above. The efficiencies of hydrolysis of milk protein by the immobilized enzymes were estimated by spectrophotometry of amino acids produced through hydrolysis.