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이형관 한국인쇄학회 1994 한국인쇄학회지 Vol.12 No.1
A new ink transfer model based on the physical mechanism for the maximum ink transfer rate is proposed, and examined by the experimental data of P.J Mangin et, al. for the relations of the maximum ink transfer rates to the printing pressure, the speed and the roughness of paper substrates. The free ink split coefficient and immobilized ink under the maximum ink transfer rate are calculated by the new model and the experimental data. It is concluded that the new model is very useful, and the free ink split coefficient and the immobilized ink are inversely propotional and propotional to the paper roughness respectively and both are saturated eventually under the critical values.
Casein - Ammonium bichromate 감광성수지의 패턴형성 및 에칭공정에 있어서 Facter들에 관한 연구
이형관 한국인쇄학회 1994 한국인쇄학회지 Vol.12 No.1
Electrochrominm is a phenomenon of reversible change in optical properties produced electrochromically. Among the several organic type electrochromic displays(ECD), the one based on viologen solution is still attractive and become of the possibility for choosing various colors by introducing different substituents in viologen molecules. But these has been rather a severe problem in this type of ECD, which is the erasing failure caused by the recrystallized molecule sticking to the display electrode.This paper was investigated on developing a new class of composite materials which consists of the mixture of BV2+ . 2BF4-, TMPD with TBABF4 as supporting electrolyte to overcome the above mentioned problem of viologen solution.
이형관,Lee, Hyeong-Gwan 한국전자통신연구원 1984 전자통신 Vol.6 No.4
This paper presents an efficient method for real power loss minimization and for improvements in voltage profiles. This method is accomplished by optimal control of reactive power in the system. The problem is formulated as an optimization problem, suitable for solution by linear programming technique. After establishing the objective function for minimizing the system losses with the help of linearised sensitivity relationships of control variables, i. e., the transformer tap position, generator terminal voltages and switchable reactive power sources. The linear programming technique is used to determine the optimal adjustments to the above variables, simultaneously satisfying the constraints. The proposed algorithm has been tested on a sample system and the result is presented and discussed.
Establishment and Maintenance of an Axenic Culture of Ettlia sp. Using a Species-specific Approach
이형관,신상윤,Long Jin,Chan Yoo,Ankita Srivastava,나현준,안치영,김희식,오희목 한국생물공학회 2015 Biotechnology and Bioprocess Engineering Vol.20 No.6
The establishment of an axenic culture of microalgae is essential step in understanding its physiology, genetics, and ecology. However, culturing of microalgae is usually accompanied by complex and variable associated prokaryotic and eukaryotic microorganisms. Conventional approaches used for obtaining axenic cultures of microalgae are time-consuming and often involve difficulties in maintaining and preserving axenicity. In this study, we developed a procedure for establishing an axenic culture of Ettlia sp. YC001 and demonstrate that we maintained the axenic culture through subculture in the long term. Three sequential treatments, an antibiotic cocktail, serial dilution, and plate spreading, were applied to strain YC001 and we confirmed axenicity using molecular and physiological methods. The bacterial community associated with strain YC001 was investigated to select antibiotics for their specific elimination. The xenic culture (1 × 106 cells/mL) was treated with the antibiotic cocktail-5 (AC-5), carbendazim, chloramphenicol, imipenem, rifampicin, and tetracycline for 3 days, followed by serial dilution up to 1 × 102 cells and spreading on agar plates. The pure colonies were analyzed using denaturing gradient gel electrophoresis (DGGE), fluorescence-activated cell sorting (FACS), and scanning electron microscopy (SEM). The procedure we developed can be applied to other strains of microalgae for the establishment of axenic cultures.
Infectious Pancreatic Necrosis Virus DRT Strain의 Capsid VP2 Gene Cloning과 Escherichia coli 내에서의 발현
이형관,권분다 建國大學校基礎科學硏究所 2002 理學論集 Vol.27 No.-
Full-length cDNA of RNA A segment of IPNV DRT strain was constructed using cDNA library of IPNV DRT strain, and the VP2 gene was copied with a PCR and expressed in Escherichia coli. The VP2 protein gene, which was cloned, was 1,529 base-pairs and produced VP2 proteins having 63 kDa. The 3'-terminal of the VP2 gene was digested out with two restriction enzymes, which produced 49 kDa and 45 kDa protein, respectively.