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발효조를 이용한 Monascus anka의 적색소와 황색소의 생산
강성국,임종환,정순택,김선재 한국미생물생명공학회 ( 구 한국산업미생물학회 ) 1996 한국미생물·생명공학회지 Vol.24 No.6
Monascus anka를 이용하여 천연식용색소를 대량생산하기 위한 방법을 개발하기 위하여 발효조를 이용하여 적색소와 황색소의 색소생산의 최적 배양 조건과 생산된 색소의 색깔 특성을 조사하였다. Monascus anka 적색소와 황색소를 생산하였는데, 이들 색소는 균체내색소와 균체외 색소로 구분되었다. 균체의 적색소(ERP)는 494nm에서, 균체외 황색소(EYP)는 380nm에서, 균체내 적색소(IRP)는 506nm에서 그리고 균체내 황색소(IYP)는 388nm에서 최대 흡광도를 나타냈다. 적색소와 황색소 생산, 색조의 특성 및 균체증식력을 배양 온도, pH, 쌀가루 농도, peptone 농도, magnesium sulfate 농도, 통기량 및 교반속도에 대하여 조사한 결과 적색소 생산력은 30℃, 초기 pH 6.0, 쌀가루 농도 3~5%, peptone 농도 0.05%, magnesium sulfate 농도 0.25%, 통기량 0.1vvm 교반속도 300rpm의 조건에서 최대치를 보였으며, 이때 ERP, EYP, IRP 및 IYP는 각각 A_494nm 0.84, A_380 nm 0.71, A_506 nm 1.18, A_388 nm 1.10, L값은 각각 29.40, 6.44, 34,98, 8.94, a값은 각각 5.76, -1.08, 11.83, -1.55, b값은 각각 18-19, 3.41 27.26, 6.16 그리고 균체량은 7.4 g/l을 보였다. 또한 황색소 생산력은 온도의 경우 적색소 생산을 위한 최적온도 보다 높은 35℃ 부근에서 우수하였으며 초기 pH와 쌀가루 농도는 적색소 생산을 위한 최적조건과 같았고, 질소원과 무기염의 농도가 높을수록 그리고 통기량이 많을수록 황색소 생산력이 우수하였다. 적색소와 황색소 생산을 위한 발효조의 교반속도는 100~300 rpm이 적합하였다. Production of Red and Yellow Pigments from Monascus anda in a Jar Fermenter, Seong-Gook Kang, Jong-Whan Rhim, Soon-Teck Jung^* and Sun-Jae Kim. Department of Food Engineering. Mokpo National University Chonnam, 534-729, Korea - In order to develop the method for mass production of natural food colorant from Monascus anka, optimum cultivation conditions for producing red and yellow pigments by cultivating the mold in a jar fermenter and their color characteristics were investigated. The mold produced red and yellow pigments both intracellularly and extracellularly. These pigments showed unique light absorption characteristics with maximum absorption of 494, 380, 506, and 388 nm for extracellular red pigment (ERP), extracellular yellow pigment (EYP), intracellular red pigment (IRP), and intracellular yellow pigment (IYP), respectively. Optimum conditions for producing red pigments were found to be temperature 30℃, initial pH 6.0, rice powder 3~5%, peptone 0.05%, magnesium sulfate 0.25%, aeration rate 0.1vvm. Optimum temperature for producing yellow pigments was around 35℃ which is higher than that of producing red pigments. The initial pH rice powder concentration for producing yellow pigments were the same as those of producing red pigments. The higher concentration of nitrogen source and inorganic salt, aeration rate, the more the yellow pigments were produced. Them optimum agitation speed was 100~300 rpm for pigment production.
정순택,임종환,박양균,황금택,박현진,안찬영,강성국,문길만 木浦大學校 工業技術硏究所 1994 工業技術硏究誌 Vol.4 No.-
Cell growth and pigment productivity of Monascus anka KCCM 11832 and Monascus sp. has isolated from the Korean Maeju(soybean koji) were determined for effect of culture medium composition and incubation conditions. Increase of NH₄NO₃, and KH₂PO₄ concentration as mineral source promoted mycelium growth, and the highest cell growth was showed in the medium with 0.05% KH₂PO₄ when C/N ratio is 20:1, but pigment production was significantly inhibited at higher concentration than this level. Cell growth and pigment production in porato dextrose medium were higher than those in czapeck-dox broth and malt extract medium. In terms of temperature, the highest cell growth was showed at 34℃, but pigment productivity was the highest at 26℃.
Bipolar DC-DC Converter Based on LCCT-Trans-Z-Source Topology
Jung Young-Gook,Park Jong-Ki 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.5
In this paper, we propose a bipolar LCCT-Trans-ZSC (Inductor-Capacitor-Capacitor-Trans-Z-source DC-DC Converter) that can mitigate voltage stress and capacitor voltage ripple and generate a bipolar output voltage according to the duty ratio. The proposed method has the characteristics and structure of both the quasi-ZSC and the conventional LCCT-ZSC but replaces the two-winding HF (High Frequency) transformer of the Z-network with a three-winding HF transformer. This method reduces voltage ripple and voltage stress compared to conventional methods, allowing CCM (Continuous Current Mode) operation with reduced input current ripple. For each method, a DSP-based experiment was performed to confi rm the validity of the proposed method. The proposed method can generate bipolar output voltages of positive 90 V and negative 50 V with respect to an input voltage of DC 70 V. In addition, as a result of comparing the capacitor voltage ripple of the Z-network and output stage voltage stress under the same conditions for each method, it was confi rmed that the proposed method has lower voltage stress (1.3%) and capacitor voltage ripple (10.3%) than the conventional method. In terms of the input current ripple, positive output was similar to each other, but negative output was slightly improved by about (1.14%) in the proposed method. Finally, the effi ciency of each method according to the change in load and duty ratio was compared.
Enhanced Program/Erase Characteristic of Arch Shaped SONOS Flash Memory
Jung Hoon Lee,Il Han Park,Seongjae Cho,Gil Seong Lee,Doo Hyun Kim,Jang Gn Yun,Yoon Kim,Jong Duk Lee,Byung-Gook Park 대한전자공학회 2008 ICEIC:International Conference on Electronics, Inf Vol.1 No.1
A novel SONOS flash memory device is proposed. The key technology of this device is the fabrication of a SONOS device on an arch shaped silicon fin. This makes the field in the tunneling oxide higher and that in the barrier oxide smaller. So when the gate bias is applied for program operation, the tunneling current increases and program speed increases. In the erase operation, back tunneling current from the poly-silicon gate decreases due to the reduced electric field. Therefore, there is no erase saturation phenomenon, enabling high speed erase operation.
정병현,신규호,안종국,김병직,서광윤 인제대학교 1987 仁濟醫學 Vol.8 No.3
동통성 비골 골절의 불유합 2례를 금속판 내고정으로 치료하여 각 3개월과 5개월에 동통 소실과 골유합을 얻었기에 보고하는 바이다. Two cases of symptomatic fibula nonunion were presented with a brief review of the literatures. The patients were treated with open reduction and plate and screws and goad results were achieved.
Jung, Keum-Dong,Lee, Cheon An,Park, Dong-Wook,Park, Byung-Gook,Shin, Hyungcheol,Lee, Jong Duk IEEE 2007 IEEE electron device letters Vol.28 No.3
<P>For the modeling of charge response behavior in the organic field-effect-transistor (OFET) channel, the admittance of the OFET channel is measured from the two-terminal MIS structures. The channel is considered as an R-C network, and both the capacitance and loss of the measured admittance show good agreement with the model. The effective delay of the R-C network depends on the sheet resistance of the channel, the insulator capacitance, and the channel length. The maximum operating frequency of an OFET can be limited by this delay, because the channel charges cannot be induced completely within the delay time</P>