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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.
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.
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.
腎動脈一時結紮에 隨伴되는 白鼠腎의 病理組織學的變化 : 特히 Alkaline Phosphatase 所見에 關하여
李亨寬 고려대학교 의과대학 1972 고려대 의대 잡지 Vol.9 No.1
It was reported that, the changes in the nephrons following the ischemis are different from each other according to the duration of the arterial ligation, and regeneration of the tissue may fall if the ligation is continued more than 2 hours. This report is concerned with the histological changes of the rat kidney after temporary ligation of the unilateral renal artery. Alkaline phosphatase, which is accumulated in the tubular epithelium, was compared with those of control group histochemically. Results were as follows: 1. Pinkish fluid retention was noted in the Bowman's space transiently, and disappeared after two days without residual morphologic change in the glomeruli. 2. Degenerative changes, such as edema or necrosis of the tubular epithelium, were seen within 2 days, then gradually the cells regenerated. Even after the renal tubular epithelium had completely regenerated, hyaline cast remained for a relatively longer period. 3. Vascular walls showed corrugation of the intima and vacuolization in the media within 2 days and returned to normal within 10 days. Tubular epithelial celis and vascular wall showed identical regenerative changes chronologically. 4. Alkaline phosphatase in the tubular epithelium thus appeared completely before the histological changes have occurred in the early stage, and gradually reappeared in the regenerating epithelial cells. Disappearance of alkaline phosphatase preceded the morphologic changes, and appearance followed the morphologic regeneration.