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Direct-Connect 초음속 연소기 내 초음속 유동 형성과정에 대한 수치해석
정승민(Seong-Min Jeong),한형석(Hyunh-Seok Han),성부경(Bu-Kyeng Sung),이은성(Eun-Sung Lee),최정열(Jeong-Yoel Choi) 한국항공우주학회 2020 韓國航空宇宙學會誌 Vol.48 No.11
본 연구에서는 직접 연결식 초음속 연소기에서 설계점을 만족하는 초음속 유동의 형성유무 및 안정화 소요시간을 확인하기 위한 수치해석이 수행되었다. 이를 위하여 연소식 공기 가열기 하류의 고압 유동이 초음속 연소기로 전파되며 초음속 유동장을 형성해가는 과정을 살펴보았다. 압력 및 온도 분석을 통해, 초음속 유동장이 설계점인 마하수 2.0, 1,000 K을 만족하며, 최소 4.0 ㎳의 안정화 시간이 필요함을 확인하였다. 따라서 초음속 연소시험에서 연료분사 이전에 유동 안정화에 필요한 시간을 고려해야 함을 알 수 있었다. In this study, a numerical analysis was performed to confirm the formation of supersonic flow and the stabilization time satisfying the design condition in a Direct-connect supersonic combustor. The process was examined in which the high-pressure gas of vitiation air heater propagates downstream to the supersonic combustor and forms a supersonic flow field. It was confirmed through the analysis of pressure and temperature that the supersonic flow field satisfies the design points of Mach number 2.0 and 1,000 K, and requires a minimum of 4.0 ㎳ for stabilization. These results indicate that the time required for the supersonic flow field stabilization should be taken into account when testing for the supersonic combustion experiment.
한우분에 굴 패각분말을 첨가 시 분의 특성과 미생물에 미치는 영향 -실험실 연구를 중심으로-
장홍희,주영호,서명지,김지윤,이성신,최정석,정승민,노현탁,김삼철,Chang, Hong Hee,Joo, Young-Ho,Seo, Myeong-Ji,Kim, Ji-Yoon,Lee, Seong-Shin,Choi, Jeong-Seok,Jeong, Seung-Min,Noh, Hyeon-Tak,Kim, Sam-Churl 한국환경과학회 2021 한국환경과학회지 Vol.30 No.8
To improve the environmental management and resources, in this study, we aimed to investigate the effect of adding oyster shell powder to Hanwoo manure on its characteristics and microbial composition during the storage period. Additives were deposited on top of the manure surface at the rate of 0, 0.5, and 1% of oyster shell powder per 200 g of Hanwoo manure in a plastic container with three replicates; however, untreated manure litter served as the control. Manure characteristics (dry matter, organic matter and crude ash) and microbial composition (lactic acid bacteria, yeast, Bacillus subtilis, Salmonella, and E.coli) were evaluated at day 0, 2, 4, and 8. Manure characteristics exhibited an effect on dry matter, organic matter, and crude ash at day 2 and 8 (p<0.05), and not for day 0 and 4 (p>0.05). With the exception of yeast content at day 4 of storage, lactic acid bacteria, yeast, Bacillus subtilis, Salmonella, and E.coli exhibited no significant differences in all conditions during the storage period. Conclusively, addition of 1% oyster shell powder to Hanwoo manure resulted in slightly better manure characteristics; however, its microbial composition remained unchanged.
무증상 원발성 막성 신병증에 병발한 반월상 사구체 신염 1례
조아진 ( A Jin Cho ),이진희 ( Jin Hee Lee ),정병호 ( Byeong Ho Jeong ),정승민 ( Seung Min Chung ),이정은 ( Jung Eun Lee ),권기영 ( Gee Young Kwon ),허우성 ( Woo Seong Huh ),김윤구 ( Yoon Goo Kim ),김대중 ( Dae Joong Kim ),오하영 ( 대한신장학회 2010 Kidney Research and Clinical Practice Vol.29 No.2
Membranous glomerulopathy (MGN) is a common cause of nephrotic syndrome in adults. Renal failure gradually develops in patients with MGN and crescentic glomerulonephritis (CGN) superimposed on MGN is a rare cause of acute renal failure. In most cases patients showed nephrotic syndrome with acute renal failure. We report a 33-year-old woman with azotemia but with no other symptoms such as nephrotic syndrome she had been diagnosed to have MGN 15 months before. There seemed to be no other cause of azotemia. Renal biopsy was performed and revealed CGN on existing MGN. She was treated with immunosuppression treatment and azotemia was improved. When unexplained azotemia develops in patients with MGN, we should promptly investigate superimposed conditions including CGN. In CGN superimposed on MN, a potentially reversible condition with appropriate immunosuppression therapy should be considered.