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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.
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초등학교 남학생의 줄넘기운동이 신체구성성분 및 AHP에 미치는 영향
이민철(Min Cheol Lee) 한국발육발달학회 2007 한국발육발달학회지 Vol.15 No.1
This study was to find out that regular and long-term rope-skipping had influence on AHP and the physical variety of senior elementary schoolboys and was to analyse the effect. Furthermore, this experiment was intended to have a positive effect on the growth of elementary schoolboys. The objects were the 5th and 6th grade male students in the elementary school. The numbers of experimental group were 14, the numbers of control group were 16. Most students had no experience in any exercise, and so let them jump rope in school easily. They jumped rope over 40 minutes, five-times a week. The rope-skipping is the exercise that cause MES(minium effective strain) for bones. The contents for measurement were weight, height, body-fat and AHP. They were measured before the exercise and 12 weeks later. The results of study were as follows; 1. In the height of the experimental group, after 12 weeks there was a little increase-+1.57cm(P<.001)-, and also in the control group, there was a little increase-+1.23cm(P<.001). 2. In the weight of the experimental group, after 12 weeks there was a little increase-+0.69kg(P<.001), and also in the control group there was a little increase-+0.59kg(P<.01). 3. In the body fat, both the experimental group and the control group had no much difference before and after exercise. 4. In AHP of the experimental group, after 12 weeks there was a little increase-+1.00cm(P<.01). On the other hand, in AHP of the control group, there was a little decrease -2.76cm(P<.001). In the result, the rope-skipping had a positive effect on AHP and the physical variety of senior elementary schoolboys. In the experimental group, AHP was increased, but in the control group, it was decreased. Therefore, this study could suggest that in the 5th grade and 6th grade male students of the elementary school-that is a maximum growth period-, regular and long-term rope-skipping had influence on the growth of them.
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Stem Cell Dynamics in an Experimental Model of Stroke
이민철,Chun-Yan Jin,김형석,김재휴,김명규,Hyoung-Ihl Kim,Young-Jin Lee,Young-Jun Son,김영옥,우영종 전남대학교 의과학연구소 2011 전남의대학술지 Vol.47 No.2
We investigated the migration of endogenous neural stem cells (NSCs) toward an infarct lesion in a photo-thrombotic stroke model. The lesions produced by using rose bengal dye (20 mg/kg) with cold light in the motor cortex of Sprague-Dawley rats were also evaluated with sequential magnetic resonance imaging (MRI) from 30 minutes through 8 weeks. Migration of NSCs was identified by immunohistochemistry for nestin monoclonal antibody in the lesion cortex, subventricular zone (SVZ), and corpus callosum (CC). The contrast to noncontrast ratio (CNR) on MRI was greatest at 12 hours in DWI and decreased over time. By contrast, T1-weighted and T2-weighted images showed a constant CNR from the beginning through 8 weeks. MRI of the lesional cortex correlated with histopathologic findings, which could be divided into three stages: acute (edema and necrosis) within 24 hours, subacute (acute and chronic inflammatory cell infiltration) at 2 to 7 days, and chronic (gliofibrosis) at 2 to 4 weeks. The volume of the infarct was significantly reduced by reparative gliofibrosis. The number of nestin+NSCs in the contralateral SVZ was similar to that of the ipsilateral SVZ in each group. We investigated the migration of endogenous neural stem cells (NSCs) toward an infarct lesion in a photo-thrombotic stroke model. The lesions produced by using rose bengal dye (20 mg/kg) with cold light in the motor cortex of Sprague-Dawley rats were also evaluated with sequential magnetic resonance imaging (MRI) from 30 minutes through 8 weeks. Migration of NSCs was identified by immunohistochemistry for nestin monoclonal antibody in the lesion cortex, subventricular zone (SVZ), and corpus callosum (CC). The contrast to noncontrast ratio (CNR) on MRI was greatest at 12 hours in DWI and decreased over time. By contrast, T1-weighted and T2-weighted images showed a constant CNR from the beginning through 8 weeks. MRI of the lesional cortex correlated with histopathologic findings, which could be divided into three stages: acute (edema and necrosis) within 24 hours, subacute (acute and chronic inflammatory cell infiltration) at 2 to 7 days, and chronic (gliofibrosis) at 2 to 4 weeks. The volume of the infarct was significantly reduced by reparative gliofibrosis. The number of nestin+NSCs in the contralateral SVZ was similar to that of the ipsilateral SVZ in each group. However, the number of nestin+ NSCs in the ipsilateral cortex and CC increased at 12hours to 3 days compared with the contralateral side (p<0.01) and was reduced significantly by 7 days (p<0.01). Active emigration of internal NSCs from the SVZ toward the infarct lesion may also contribute to decreased volume of the infarct lesion, but the self-repair mechanism by endogenous NSCs is insufficient to treat stroke causing extensive neuronal death. Further studies should be focused on amplification technologies of NSCs to enhance the collection of endogenous or transplanted NSCs for the treatment of stroke.
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이민철,정태현 한국중소기업학회 2018 中小企業硏究 Vol.40 No.4
This study focuses on the role of demand among growth drivers of small and medium enterprises. In particular, this study regards participation in the public procurement programs as a particular form of demand shock. Then we hypothesize that the higher the procurement dependency, the higher the growth rate. We discuss the following mechanisms: public relations and signaling effects, stimulation of technology and quality, mitigating effects of market uncertainty, and economies of scale and learning effects. As a result of analyzing and 644 participating SMEs of Korea's Excellent Product Designation Policy from 2011 to 2016, we found a supporting evidence for the hypothesis. However, the growth effects of the public procurement participation tend to weaken over time. In conclusion we discuss the contributions and limitations of this study on the literature about the role of demand on firm growth, on one hand, and demand-oriented public procurement, on the other hand. 본 연구는 중소기업의 성장을 추동하는 요인 중 수요의 역할에 주목한다. 특히, 본 연구는 조달청의 우수조달 물품 지정기업의 조달실적을 수요충격의 특수한 형태로 보고 조달의존도가 높은 기업일수록 성장률이 높을 것이라고 주장한다. 그 논거로 공공조달의 홍보 및 신호효과, 기술 및 품질 향상 자극효과, 시장 불확실성 완화효과, 규모의 경제와 학습효과를 논한다. 2011년부터 2016년까지 한국의 우수조달 지정제도의 수혜기업 644개에 대한 자료를 새로이 구축하여 실증 분석한 결과, 기업의 이질적 개체효과를 통제하고서도 공공조달 납품실적이 매출 대비 높은 기업일수록 향후 민간시장에서의 매출 성장률이 그렇지 않은 기업보다 높다는 증거를 발견했다. 단, 이와 같은 성장효과는 시간이 지남에 따라 약화되는 경향이 있음도 확인했다. 결론에서는 중소기업 성장과 수요에 관한 학술적 논의, 수요지향형 공공조달의 중요성에 관한 학술 및 정책적 논의에 대한 본 연구의 기여와 한계점을 논하며 마무리한다.
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이민철(Min Chul Lee),서석빈(Seok Bin Seo),정재화(Jae Hwa Chung),주용진(Youg Jin Joo),안달홍(Dal Hong Ahn) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
DME (Dimethyl Ether, CH₃OCH₃) has highly attracted attention as an alternative fuel for transportation, power generation and LPG substitute owing to its easy transportation and cleanliness. This study was conducted to verify the combustion performance and to identify potential problems when DME is fuelled to a gas turbine. GE7EA gas turbine of Pyong-Tak power plant was selected as a target to apply the DME. Combustion tests were conducted by comparing DME with methane, which is a major component of natural gas, in terms of combustion instability, NOx and CO emissions, and the outlet temperature of the combustion chamber. The results of the performance tests show that DME is very clean but has a low combustion efficiency in low load condition. From the results of the fuel nozzle temperature we have ascertained that DME is easy to flash back, and this property should be considered when operating a gas turbine and retrofitting a burner.
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이민철(Min Cheol Lee),전만수(ManSoo Joun) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
In this paper, we apply a forging simulator to automatic simulation of a connecting-rod forging process and compare its results with others found in the literature. The process information comes from the distributed examples of DEFORM3D. The process is fully automatically simulated using the tetrahedral element capability of AFDEX3D, developed by the authors. Our results are compared with the results found from the related literature, already simulated using DEFORM3D by other researchers. The comparison shows that our results are relatively excellent especially in terms of mesh quality on which the solution accuracy depends mainly.
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