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Ghim, Sa-Youl Korean Society of Life Science 2001 Journal of Life Science Vol.11 No.2
The pyrR gene of the pyrimidine biosynthesis (pyr) operon of the thermophile Bacillus caldolyticus, encoding a uracil phosphoribosyltransferase (UPRTase), turned to rely as a pyr operon regulator. It has been proposed that PyrR mediates transcriptional termination-antitermination at three intercistronic regions of the par operon (S.-Y Ghim and J. Neuhard, J. Bacteriol.,176, 3698-3707, 1994). In this research, a plasmid carrying the pyrR region of B. caldolyticus could restore a pyrimidine regulation in a pyrR mutant of B. subtilis. Expression of pyrR was found to increase 6-7 fold during pyrimidine starvation. Additionally, a highly conserved nucleotide sequence which may constitute the binding site for a PyrR protein (PyrR-binding loop) in transcript was staggested. Alternative antiterminator and terminator structures involving three conserved motifs in front of the pyrR, pyrP and pyrB genes, respectively, are proposed to account for the observed regulation pattern.
RAPID PURIFICATION AND MOLECULAR CHARACTERIZATION OF HUMAN NEUTROPHIL ELASTASE
Ghim, Sa-Youl,Bae, Sung Jun,Kang, Kooil 고신대학교 의학부 1989 高神大學校 醫學部 論文集 Vol.5 No.1
Elastase에 의해 야기되는 질병의 예방 및 치료 응용을 위하여는, 먼저 이 효소가 고순도로 분리되고 그 근본적인 성질의 해명이 이루어져야 한다. 고순도의 elastase를 얻기위해, 사람의 전혈로부터 Hypaque-Ficoll step gradient에 의해 순수한 neutrophil을 얻은 다음 이것을 extract로 만들어 액체크로마토그래피를 실시하였다. Ultrogel AcA54 gel filtration을 거친 후 CM-sephadex 이온교환 크로마토그래피를 적용하였는데, 이때 유출 완충액 속에 0.1% Brij 35를 첨가하여 elastase의 순도를 더욱 높일 수 있었다. 이 정제된 elastase는 SDS-PAGE를 통해 MW 28,000, 29,000, 30,000의 서로 다른 3개 의 밴드로 확인되었으며, 그간 수많은 연구자들간에 elastase의 분자량에 대해 심한 견해 차이를 보여온 것은 그 분자적 성질이나 분자량이 유사한 cathepsin G가 혼재하거나 elastase분자내 혹은 분자간 S-S결합의 차이에 의함을 알 수 있었다.
ADVANCED TREATMENT OF LEACHATE BY MEMBRANE PROCESSES
GHIM, Shijun,OZAKI, Hiroaki,TERASHIMA, Yutaka 嶺南大學校 環境問題硏究所 1996 環境硏究 Vol.16 No.1
AbstractIn this research, we present the treatment results ofleachates from landfill sites of municipal solid wastes or artificial incineration ash leachate by the process of ASMF (activated sludge process with microfiltiation membrane) combined with LPRO (low pressure reverse osmosis membrane). The LPRO showed a high removal of recaldttant substances and inorganic salts. However, this process is not appropriate fer the direct leachate treatment. Thus, the ASMF using ceramic membrane of the pore size of 0.1 fim was applied as a pretreatment process.As the result of experiments, it was found that these processes could effectively remove both recalcitrant substances and inorganic salts of leachates. For example, the treatment efficiencies of artificial. incineration ash leachate by ASMF combined with LPRO were 99 % ofCODcr, 55 %ofT-N, 70 % of calcium, and 53 % of sodium. Therefere, it was confirmed that the process of ASMF combined with LPRO can become an alternative to the physico-chemical process in conventional leachate treatment plant. In this research, we present the treatment results of leachates from landfill sites of municipal solid wastes or artificial incineration ash leachate by the process of ASMF (activated sludge process with microfiltration membrane) combined with LPRO (low pressure reverse osmosis membrane). The LPRO showed a high removal of recalcitrant substances and inorganic salts. However, this process is not appropriate for the direct leachate treatment. Thus, the ASMF using ceramic membrane of the pore size of 0.1㎛ was applied as a pretreatment process. As the result of experiments, it was found that these processes could effectively remove both recalcitrant substances and inorganic salts of leachates. For example, the treatment efficiencies of artificial incineration ash leachate by ASMF combined with LPRO were 99% of COD_cr, 55% of T-N, 70% of calcium, and 53% of sodium. Therefore, it was confirmed that the process of ASMF combined with LPRO can become an alternative to the physico-chemical process in conventional leachate treatment plant.
3D surface mapping of freeform optics using wavelength scanning lateral shearing interferometry.
Ghim, Young-Sik,Rhee, Hyug-Gyo,Davies, Angela,Yang, Ho-Soon,Lee, Yun-Woo Optical Society of America 2014 Optics express Vol.22 No.5
<P>Freeform optics have emerged as promising components in diverse applications due to the potential for superior optical performance. There are many research fields in the area ranging from fabrication to measurement, with metrology being one of the most challenging tasks. In this paper, we describe a new variant of lateral shearing interferometer with a tunable laser source that enables 3D surface profile measurements of freeform optics with high speed, high vertical resolution, large departure, and large field-of-view. We have verified the proposed technique by comparing our measurement result with that of an existing technique and measuring a representative freeform optic.</P>
Ghim, G.,Lee, J. Pergamon ; Elsevier Science Ltd 2016 Applied thermal engineering Vol.106 No.-
The existence of temperature gliding in non-azeotropic mixture working fluids provides a promising opportunity for greatly improved resource utilization in organic Rankine cycle (ORC) systems for geothermal applications. The condensation heat transfer degradation associated with working fluid mixtures is an unavoidable penalty that may reduce the utilization and system benefits by necessitating larger heat exchangers. The objective of the current study is an experimental investigation of condensation heat transfer for R245fa, n-pentane, and a composition of their mixture. Quasi-local condensation heat transfer coefficients are measured in a straight horizontal smooth tube with flow conditions at mass flux G=100 and 150kg(m<SUP>2</SUP>s)<SUP>-1</SUP>, local equilibrium quality x=0.05-0.80, and reduced pressures P<SUB>r</SUB>=0.05-0.15. The reduced condensation heat transfer coefficients from the test are compared with the predictions from already established mixture correction methods in the literature. Pure components R245fa and n-pentane condensation heat transfer data are well predicted by Shah (1979) correlations for all test conditions. However, their non-azeotropic mixture condensation heat transfer data require additional correction parameter to account for the heat transfer degradation. This correction parameter is correlated by the temperature gliding gradient of mixture fluids. Test data with mixture working fluids from current study are reasonably well predicted by the corrected in-tube correlation.
Condensation heat transfer of low GWP ORC working fluids in a horizontal smooth tube
Ghim, G.,Lee, J. Pergamon Press ; Elsevier Science Ltd 2017 INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER - Vol.104 No.-
The objective of the current study is to conduct an experimental investigation of condensation heat transfer for the ORC (organic Rankine cycle) working fluids R245fa, Novec®649 and HFE-7000 over a wide range of parameters. Quasi-local condensation heat transfer coefficients are measured in a straight horizontal 7.75-mm-ID smooth tube with flow conditions at mass flux G=150-700kg (m<SUP>2</SUP>-s)<SUP>-1</SUP>, local equilibrium quality x=0.05-0.95, and reduced pressure, P<SUB>r</SUB>=0.05-0.15. Test data reveal that the environmentally friendly fluids have lower condensation heat transfer coefficients when compared to R245fa. The 141 measured condensation heat transfer coefficients are compared to six well-known correlations. Among the six correlations verified with test data, the Shah correlation shows the best predictive performance for the three fluids tested.