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PDP 스캔 전극 구동방식에 따른 방전 특성의 변화에 관한 연구
김중균,Kim, Joong-Kyun 한국조명전기설비학회 2005 조명·전기설비학회논문지 Vol.19 No.8
본 연구는 스캔 구동 회로의 변화에 따른 교류형 플라즈마 표시기의 구동 특성에 관한 것이다. 본 연구에서는 교류형 플라즈마 표시기의 용량성 부하 특성을 활용하여 스캔 라인 당 소요되는 스위치의 수를 줄일 수 있는 회로를 제안하고 그 적용 가능성을 고찰하였다. 제안된 방식의 실용화 가능성에 대한 검증을 위하여 방전 유지 전압의 변화에 따라 어드레싱 전압의 변화를 관찰하여 동적 전압 마진을 측정한 결과, 기존 방식에 비하여 9[V] 가량의 전압마진 감소가 관찰되었다. 이는 제안된 방식의 경우 선택된 전극의 스캔 기간에 이웃한 전극에 전위에 영향을 줌으로써 상호 간섭이 유발되는 효과에 의한 것으로 해석되었다. 최소 어드레싱 전압과 어드레싱 방전의 방전 지연 시간에 변화가 없는 점을 감안하면 제안된 방식의 실제 회로 적용은 가능할 것으로 사료된다. The variation of discharge characteristics of an ac PDP was observed with the charge of scan electrode driving circuit. Conventional scan electrode driving circuit provides two switches per one scan line, and the suggested one can be constituted by one switch per one scan line with the consideration of capacitive load characteristic of an ac PDP. To verify the workability of the suggested scheme, the performances of the ac PDP was investigated. The dynamic voltage margin was slightly decreased with the adoption of the suggested scheme, which is estimated to result from the misfiring of unselected discharge cells due to the deformation of voltage level of the neighboring scan electrode. In the observation of the delay characteristics of addressing discharge, the performances of the conventional circuit and the suggested one are assumed to be equivalent.
김중균(Joong Kyun Kim) 한국조명·전기설비학회 2016 조명·전기설비학회논문지 Vol.30 No.1
In this study, electrical and spectroscopic characteristics were investigated in the pin to plate discharge of 0.9% weight per unit volume saline solution. The positive and positive- and negative-going dc pulse with 5% duty ratio were applied to tungsten pin electrode. The more amount of discharge current flew in negative discharge. The temperature, which is considered as a local value in the vicinity of vapor of discharge, was about 3,000K which is much higher than the value recommended to be controlled. It can be suggested that not only the temperature of liquid but also the local temperature of vapor is monitored to investigate damages on tissue or cells in biological application.
김중균(Joong Kyun Kim) 한국조명·전기설비학회 2020 조명·전기설비학회논문지 Vol.34 No.12
In this study, the change in the characteristics of the saline solution discharge were investigated with the variation of driving condition. Regardless of the pulse polarity to the pin electrode, the amplitude of circuit current decreased but flew continuously with the insertion of series resistor to the power source when 5% duty ratio pulse was applied to a saline solution of 0.9% mass per unit volume in a pin to plate structure. The temperature of the discharge medium was measured from the spectrum of the hydroxy group molecular lines near 308 [nm] obtained during discharge, and the electron density using the Stark broadening of the Hβ line at 486 [nm], which is one of Balmer series hydrogen atomic line. The maximum temperature and electron density in the discharge medium decresed with the increase of series resistor inserted when the negative pulse was applied to the pin electrode. On the other hand, the positive pulse application to the pin electrode hardly led a temperature change while the change in the electron density was observed. It is estimated that the negative pulse application to a pin electrode and series resistor insertion in the driving circuit will helpful to widening the operation window in a liquid discharge.
Pyrococcus furiosus의 β-1,3-glucanase를 처리한 laminarin 분해 산물을 이용한 바이오 에탄올의 생산
Dong-Gyun Kim(김동균),Eun-Young Kim(김은영),Yu-Ri Kim(김유리),Joong Kyun Kim(김중균),Han-Seung Lee(이한승),In-Soo Kong(공인수) 한국생명과학회 2011 생명과학회지 Vol.21 No.1
갈조류 유래의 다당류인 laminarin을 기질로써 호열성 미생물인 Pyrococcus furiosus의 β-1,3-glucanase와 반응시킨 뒤, 분해산물을 yeast를 이용한 알코올 발효과정을 통하여 에탄올을 생산하고자 하는 연구를 수행하였다. 33 kDa (297 a.a, 894 bp)의 재조합 β-1,3-glucanase를 대장균에게 발현 후 순수하게 정제 하였으며, 정제한 β-1,3-glucanase와 laminarin을 반응시킨 결과 단당을 포함하여 oligo당 형태로 분해됨을 TLC와 HPLC로써 확인하였다. 그리고 이러한 분해산물을 에탄올 생산 배지의 유일한 탄소원으로써 첨가하여 yeast를 배양한 결과 48시간 뒤에는 세포 외로 최소 0.3%의 알코올을 생산함을 gas chromatography로써 확인하였다. 따라서 β-1,3-glucanase와 laminarin의 최적 분해반응 및 yeast의 최적 알코올 발효 조건을 확립한다면 본 연구의 방법을 이용한 해조류로부터의 bio-ethanol의 생산을 성공적으로 수행 할 수 있으리라고 판단된다. β-1,3-glucanase from Pyrococcus furiosus was applied for the saccharification of laminarin, which is a major oligo-saccharide component of brown algae, and the reaction mixture produced from laminarin was utilized as a substrate for alcohol fermentation using yeast. To prepare the recombinant β-1,3-glucanase, a β-1,3-glucanase gene was overexpressed in Escherichia coli and purified. Laminarin was degraded to an oligo- and mono-saccharide, such as glucose, after reaction with the purified recombinant β-1,3-glucanase, and the products after enzymatic treatment were confirmed by TLC and HPLC analysis. Decomposed laminarin after enzyme reaction was only added to the medium as a C-source for yeast alcohol production reaction. 0.3% alcohol production was detected from the cultured broth by gas chromatography after 48 hr of incubation. Further evaluation for optimal conditions of saccharification and alcohol fermentation can be suggested, as well as the possibility of using this enzymatic method to produce ethanol using laminarin.
정수경,김중균,Jeong, Soo Kyoung,Kim, Joong Kyun 한국해양바이오학회 2007 한국해양바이오학회지 Vol.2 No.2
A $Q_{10}$-producing photosynthetic bacterium was isolated from the silt at Nakdong river. The isolate had 1.55 mg of $Q_{10}$ per gram of dry cell. By the 16s-rDNA sequence analysis, the isolate was found to be Rhodobacter sphaeroids with 100% similarity (Genbank Accession No.=AM696701).
정수경,김중균,Jeong, Soo Kyoung,Kim, Joong Kyun 한국해양바이오학회 2007 한국해양바이오학회지 Vol.2 No.3
Cultivation of a $Q_{10}$-producing photosynthetic bacterium, Rhodobacter sphaeroids, was carried out in a 1-L flask to characterize its cellular growth reaction. The result of experiment showed that dissolve oxygen in the broth was depleted within 7 h. ORP decreased with decrease of DO, and recovered somewhat with increase of pH. The growth of R. spahaeroids reached at late-log phase in 140 h of reaction. The final pH and dry-cell weight were 7.62 and 2.2 mg/mL, respectively. The $Q_{10}$ content in the final broth was 2.35 mg/g dry cell weight, which was higher than that obtained in tube culture.