http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
이민철,정종락,김수일 한국수산학회 1976 한국수산과학회지 Vol.9 No.2
민어 (croaker-Nibea imbricata, Matsubara), 참조기 (yellow corvenia-Pseudosciaena manchurica, Jordan and Thompson) 그리고 물가자미(roundnose flounder-Xystrias grigorjewi, Herzenstein) 어육을 0.5 Mrad이하의 감마선량에 조사하여 냉장기간중의 선도 유지기간 연장을 가져오는 최적 조사선량을 구하였다. 조사된 어육을 0˚와 5℃에 35일간 저장하는 동안에 일어나는 관능학적 변화를 미생물학적, 화학적 변화와 비교 검토하였다. 0℃ 저장을 위한 민어와 참조기의 최적선량은 0.1 Mrad였으며 5℃ 저장에서는 0.2 Mrad였다. 물가자미는 방사선 조사에 대단히 민감하여 0˚와 5℃ 다같이 0.1 Mrad였다. 각각의 최적선량에 조사 처리하므로써 민어의 경우 0℃에서는 선도 유지기간이 비 조사구의 2주간에서 5주간(3-4배)으로 연장되었으며 5℃에서는 역시 1주간 이내에서 4주간(4-5배)으로 연장이 가능하였다. 참조기는 0℃에서는 3∼4배로, 5℃에서는 4-5배로 그리고 물가자미는 0℃에서 4-5배, 5℃에서 6-7배로 각각 연장되었다. Optimum doses The optimum dose that may be defined as the dose below the maximum permissible dose, yet would bring about a significant storage life extension at refrigerated temperatures, varied with species of fish as well as with the postirradiation storage temperatures. Thus the dose of 0.1 Mrad was considered to be optimum for the croaker and yellow corvenia at 0℃, while at 5℃ the dose of 0.2 Mrad would be suitable for both species. The roundnose flounder was more radiosensitive and even at the dose of 0.1 Mrad a slight irradiation odor was detected immediately after the radiation treatment. Such degree of irradiation odor disappeared upon stoage, therefore, the dose of 0.1 Mrad was considered to be optimum for the roundnose flounder at both 0˚and 5℃. Storage life extension The croaker meats irradiated at 0.1 Mrad could be held at 0℃ as long as 5 weeks in good acceptable conditions, while the unirradiated control became unacceptable within 2 weeks-3-4 for extension of storage life at 0℃. At the storage temperature of 5℃, the storage life of 0.2 Mrad irradiated samples was extended from less than one week to 4 weeks-4-5 fold extension. The storage life extension of 0.1 Mrad irradiated yellow corvenia at 0℃ was from less than 2 weeks for the unirradiated to 4 weeks-approximately 2-3 folds and that of 0.2 Mrad irradiated samples stored at 5℃ was from 5 days to 3 weeks 4-5 folds. The roundnose flounder meats irradiated at 0.1 Mrad could be held at 0℃ for 3-4 weeks as compared to less than 1 week for the unirradiated and at 5℃ the storage life could be extended from less than 3 days to up to 2 weeks. Thus the storage life extension by 4-5 folds and by 6-7 folds was possible at 0˚and 5℃ storage, respectively. Postirradiation storage microbiology and biochemistry In general 10 fold reduction of initial microflora was realized as a result of irradiating fish samples at 0.1 Mrad. The extent of microflora reduction increased with increasing doses applied, but not proportionately dependent. The microbial growth in the irradiated was severely retarded during the subsequent storage period, lagging far behind that of the unirradiated control samples except in the late storage phase, when the levels of microflora of the irradiated either approached to or rose above the levels of the unirradiated. The microbiological changes caused by irradiation was reflected in the pronounced suppression of TVB and TMA accumulation during the storage period. This suggests that irradiation treatment brought about both quantitative and qualitative changes in microflora initially present and it is reasonable to suggest that the microflora removed by irradiation in fact represent most of the flora capable of producing TVB and TMA in normal fish spoilage process.
시간지연분석을 이용한 모델 가스터빈 연소기 내에서 H₂/CO/CH₄ 합성가스의 연소불안정 메커니즘에 관한 실험적 연구
이민철,윤지수,주성필,김정진,윤영빈 한국항공우주학회 2013 한국항공우주학회 학술발표회 논문집 Vol.2013 No.11
본 연구는 GE7EA 모델 가스터빈 연소기 내에서 H₂/CO/CH₄로 구성된 합성가스의 연소불안정 메커니즘에 대해 기술하고 있다. 상세한 불안정 메커니즘은 대류, 음향, 화학시간과 같은 특성시간스케일을 이용하여 그들의 지연시간을 계산한 후 불안정 주기가 Rayleigh 기준에 일치하는지 여부에 의해 판단하는 시간지연모델을 이용하여 분석되었다. 화염에서 대류 및 음향 시간스케일을 계산하기 위해서는 OH-PLIF 이미지와 화염 평균온도를 이용한 음향속도가 사용되었다. 수소함량을 증가시킬수록, 화염의 길이는 줄어들었고, 따라서 화염안에서 대류속도가 주로 줄어들어 연소불안정의 크기와 주파수에 영향을 미쳤다. 예를 들어, 고부하 고수소함량의 조건에서는 수소의 빠른 연소속도로 인해 짧은 파장의 동압과 열발생이 결합하기 쉽고, 이에 고주파수의 연소불안정(1000Hz 이상)이 발생하였다. 그 반면에 저부하 저수소함량의 조건에서는 긴 파장의 동압과 열발생이 결합하기 쉽고, 이에 저주파수의 불안정(800Hz 이하)이 발생되었다. This Study describes the combustion instability mechanism of synthetic gas composed mainly of H₂/CO/CH₄ model GE7EA gas turbine combustor. Detailed instability mechanism is analyzed using time lag model which judges whether the time difference between periodic time with sum of lagging time scales such as convective, acoustic, chemical and effective times, coincides with the Rayleigh criterion. To calculate the convective and acoustic time scale in flame, time averaged OH-PLIF images and speed of sound using mean temperature in flame are considered. As increasing hydrogen content, flame is shortened and thus mainly convective time in flame is decreased. For example, in high load and high hydrogen condition, high frequency of instability(over 1000Hz) is generated since dynamic pressure and heat release in flame is easier to be coupled with shorter wave length due to fast burning of hydrogen. On the other hands, in low load and small hydrogen condition, low frequency of instability(under 800Hz) is generated since pressure and heat release in flame is easier to be coupled with longer wave length.
정상 성인과 Alzheimer병 환자 대뇌에서 주요 Gangliosides의 발현
이민철,우영종,김승업,Tadashi Tai 대한병리학회 2002 Journal of Pathology and Translational Medicine Vol.36 No.6
Background : GM1 ganglioside-bound amyloid beta-protein (GM1/A ) has been reported to be involved with senile plaque formation in Alzheimer disease. Methods : To investigate the binding of major gangliosides on senile plaques and neurofibrillary tangles of Alzheimer disease-specific pathology, we developed four monoclonal antibodies -- GM1, GD1a, GD1b, and GT1b -- employing the hydridoma technique, and applied them for immunohistochemical staining at the frontotemporal neocortex and hippocampus of Alzheimer disease brains and agematched control brains. Results : Moderate immunopositivity for GM1 and GD1a was noted on the senile plaques and neurofibrillary tangles. Mild immunopositivity for GD1b and GT1b on neurofibrillary tangles was noted. Strong GD1b immunopositivity was observed on a few neurons and neurites. Strong immunopositivity for GT1b, and moderate immunopositivity for GM1 and GD1a were noted on reactive astrocytes. Conclusions : These observations suggest that GM1 and GD1a may be involved in the formation of senile plaques as well as neurofibrillary tangles in Alzheimer disease brains.