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PSEUDOMONAS AERUGINOSA(錄膿菌)에 關한 實驗的 硏究
朴貳喆,李承薰 서울대학교 1967 서울대학교 論文集 Vol.18 No.-
Since the original report of Gessard in 1882, Ps. aeruginosa has been known as blue pus-producing becteria. Being produced by the organisms during the growth and multiplication, one of the pigments, pyocyanin, was discovered by Emmerich and Loew and confirmed later to possess an antibiotic activities to most Gram positive cocci. The fact seemed to be incompatible with the clinical findings that there are many cases of mixed infections due to pseudomonas and Gram positive cocci. It was assumed that the physiology of pseudomonas, including the pigment productions, might be different in vivo conditions in the inflammatory lesions from in vitro culture conditions. Though the present experimental technology would not make possible the exact duplication of in vivo conditions in vitro, it was thought to be worth-while to observe the bacterial behaviors under varied cultural conditions. Thus 20 strains of Ps. aerguinosa were cultured at 30℃ and 37℃ aerobically and at 40℃ under decreased O_2 and incrcreased CO_2 tensions in candle-jar, which is said to be nearer to the conditions in most of closed inflammatory lesions (Dubos). Some biological features of the organisms cultivated under varied conditions were studied and viable organisms of the cultures, pseudomonas alone or mixed with the suspension of Staph. aureus culture, were inoculated subcutaneously into the abdominal regions of rabbits. Results of the studies might be summarized as follows: 1.Compared to the organisms cultured below 37℃, the cells of Ps. aerguinosa, when they were grown above 37℃., were larger and motility more sluggish. 2.Of the increase of viable units in nutrient broth, no significant difference was noticed among the cultures grown under the varied conditions. 3.Compared to the aerobic growth at 30℃. or 37℃., the pigment productions of Ps. aeruginosa strains were noticiably diminished at 40℃. in candle-jar. 4.Biochemically the pseudomonas strains appeared to be more active at 40℃. in candle-jar than under the other cultural conditions studied.
이철,이영남,박길동,윤석인,하승수 한국식생활문화학회 1989 韓國食生活文化學會誌 Vol.4 No.2
김치의 숙성과정 중의 물리적 특성을 측정하기 위하여 원료배추의 엽두께, 절임시의 두께 및 pH, total acidity, 염도 등의 변화를 연구하였다. 원료배추의 엽두께는 최외엽보다 내엽의 두께가 50% 감소되었고 절임의 경우에서는 외엽이 내엽보다 감소율이 낮았다. 배추조직의 절단력 측정에서는 절임으로 인하여 상대적인 절단력이 높았고 김치숙성이 되면서 증가하며 7일을 기준으로 감소하였다. Stress에서도 상대적 절단력과 같은 경향이나 숙성 후의 감소되는 점이 잘 나타나지 않았다. pH의 변화에 대한 상관식은 Y=0.23X+6.13이었고 젖산함량의 관계식은 Y=0.09X-0.01로서 매우 완만한 기울기이었으며 김치로서의 적정수준은 pH4.2, 젖산함량은 0.63의 수준이었고 기간은 7일이었다. Kimchi during fermentation with different periods of storage at room temperature were evaluated for the textural properties, titratable acidity, pH value and thickness of leaves in salting, during fermentation. Thickness of internal leaves in Korean cabbage were decreased of 50% for external leaves. but less decreased on the thickness of leaves in salting. Cutting force of leaves were increased with salting and during kimchi fermentation before 7 days. Stress (force vs area) in kimchi and Korean cabbage was same result of cutting force. Equation of pH change was y=-0.23x+6.13 (r=-0.97). Titratable acidity equation was y=0.09x-0.01(r=0.96). A desirable pH value and titratable acidity were 4.2 and 0.63% in kimchi fermentation.
코로나-19 이전과 이후 식생활 관련 제로웨이스트 운동 양상과 소비자 반응 비교
박인형 ( In-hyoung Park ),박유민 ( You-min Park ),이철 ( Cheol Lee ),선정은 ( Jung-eun Sun ),호문접 ( Wendie Hu ),정재은 ( Jae-eun Chung ) 대한가정학회 2022 Human Ecology Research(HER) Vol.60 No.1
This study uses text mining compares and contrasts consumers’ social media discourses on dietary related zero-waste movement before and after COVID-19. The results indicate that the amount of buzz on social networks for the zero- waste movement has been increasing after COVID-19. Additionally, the results of frequency analysis and topic modeling revealed that subjects associated with zero-waste movement were more diversified after COVID-19. Although the results of a sentiment analysis and word cloud visualization confirmed that consumers’ positive responses toward the zero-waste have been increasing, they also revealed a need to educate and encourage those who are still not aware of the need for zero-waste. Finally, consumers mentioned only a small number of companies participating in zero-waste movement on SNS, indicating that the level of active involvement by such companies is much lower than that of consumers. Theoretical and educational implications as well as those for government policy-making are considered.
대규모 미시교통시뮬레이션모형 구축을 위한 O/D 추정 방법 성능 비교 - 중력모형과 QUEENSOD 방법을 중심으로 -
윤정은,이철기,이환필,김경현,박원일,윤일수 한국도로학회 2016 한국도로학회논문집 Vol.18 No.2
PURPOSES : The aim of this study was to compare the performance of the QUEENSOD method and the gravity model in estimating Origin-Destination (O/D) tables for a large-sized microscopic traffic simulation network. METHODS : In this study, an expressway network was simulated using the microscopic traffic simulation model, VISSIM. The gravity model and QUEENSOD method were used to estimate the O/D pairs between internal and between external zones. RESULTS: After obtaining estimations of the O/D table by using both the gravity model and the QUEENSOD method, the value of the root mean square error (RMSE) for O/D pairs between internal zones were compared. For the gravity model and the QUEENSOD method, the RMSE obtained were 386.0 and 241.2, respectively. The O/D tables estimated using both methods were then entered into the VISSIM networks and calibrated with measured travel time. The resulting estimated travel times were then compared. For the gravity model and the QUEENSOD method, the estimated travel times showed 1.16% and 0.45% deviation from the surveyed travel time, respectively. CONCLUSIONS : In building a large-sized microscopic traffic simulation network, an O/D matrix is essential in order to produce reliable analysis results. When link counts from diverse ITS facilities are available, the QUEENSOD method outperforms the gravity model.
박영란,Na Liu,이철진 한국물리학회 2013 Current Applied Physics Vol.13 No.9
We investigated the dependence of localized surface plasmon resonance (LSPR) coupled photoluminescence(PL) emission on the density of a metallic single-walled carbon nanotube (m-SWCNT). Them-SWCNTs of various densities were deposited on top of ZnO films by spin coating and filtration transfermethod to form the hybrid structures.We observed PL enhancement from ZnO films deposited with spincoated m-SWCNT, comparing with pure ZnO film. The m-SWCNT acts as absorbers for the light emitteddue to SPR. After resonant excitation, hot electrons in m-SWCNT are created in high energy states, whichcan then transfer from the m-SWCNT to the conduction band of the ZnO films. We discuss the relationshipbetween the hot electron flow generated by internal photoemission and LSPR.