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LPG 소형저장탱크 인접 화재 시 폭발 예방 및 진압방안 연구
윤상태,홍중표,김월수,김오수 한국화재감식학회 2019 한국화재감식학회 학회지 Vol.10 No.2
Safety measures and fire response strategies are suggested by analyzing the risk of LPG small storage tanks installed adjacent to buildings. Theoretical consideration and analysis of the explosion case reveal that the criteria for the tank installation is not based on the safety distance from adjacent exterior walls, which results in direct exposure to flames in the event of fire. The role of safety valves is limited, which is confirmed by the fire simulation analysis. By concentrating firepower on the explosion defense activities, the golden time to prevent building combustion expansion would eventually increase damage. It is required to strengthen the safety distance criteria of small storage tanks and propose suppressive tactics manual for efficient response in case of fire in small storage tanks.
濟州道에 있어서 Sudan grass 雜種形質에 時期的 變化에 관한 硏究
趙南棋,尹相泰 제주대학교 1986 논문집 Vol.22 No.-
This study was carried out to investigate the seasonal changes of different varieties of Sudan grass. The varieties used in the trials were TE. Gold maker, Common Sudan grass, Pioneer 988 and TE. Hay grazer. The results obtained were summarized as follows: 1. The seasonal changes in plant height, according to variety, varied from 4-6cm. 20 days after seeding but the plants grew to 150-203 cm in height by the 3rd September, the last harvest time. 2. The Sudan grasses under investigation grew slowly up to 50 days after sowing but thereafter grew rapidly until the last harvest time. 3. Changes in width and length of leaves and stem diameter were not apparent 20 days after sowing (5th July) until 4th August. However there were considerable changes from 4th August to 3rd September. 4. Differences in characters between Gold maker and Common Sudan grass were highly significant but there were no significant differences between TE. Hay grazer and Pioneer 988. 5. Of all the varieties Pioneer 988 gave the best results with the highest plant height, greatest yield and the number of leaves.
Simple Maturation of Direct-Converted Hepatocytes Derived from Fibroblasts
조영덕,윤상태,강교진,김요한,이승범,서대관,류기영,정재민,최동호 한국조직공학과 재생의학회 2017 조직공학과 재생의학 Vol.14 No.5
Target cells differentiation techniques from stem cells are developed rapidly. Recently, direct conversion techniques are introduced in various categories. Unlike pluripotent stem cells, this technique enables direct differentiation into the other cell types such as neurons, cardiomyocytes, insulin-producing cells, and hepatocytes without going through the pluripotent stage. However, the function of these converted cells reserve an immature phenotype. Therefore, we modified the culture conditions of mouse direct converted hepatocytes (miHeps) to mature fetal characteristics, such as higher AFP and lower albumin (ALB) expression than primary hepatocytes. First, we generate miHeps from mouse embryonic fibroblasts (MEFs) with two transcription factors HNF4a and Foxa3. These cells indicate typical epithelial morphology and express hepatic proteins. To mature hepatic function, DMSO is treated during culture time for more than 7 days. After maturation, miHeps showed features of maturation such as exhibiting typical hepatocyte-like morphology, increased up-regulated ALB and CYP enzyme gene expression, down-regulated AFP expressions, and acquired hepatic function over time. Thus, our data provides a simple method to mature direct converted hepatocytes functionally and these cells enable them to move closer to generating functional hepatocytes.