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안승희 ( Seung Hee An ),차상헌 ( Sang Heon Cha ),김미경 ( Mi Kyung Kim ),김지영 ( Ji Young Kim ),최규연 ( Gyu Yeon Choi ),이정재 ( Jeong Jae Lee ),이임순 ( Im Soon Lee ) 대한산부인과학회 2009 Obstetrics & Gynecology Science Vol.52 No.5
Adenomatoid tumor of uterus is described by Golden and Ash as a tumor that similar to adenoma but found obscured histogenesis. Adenomatoid tumor is a rare benign disease that originated from mesothelium and mostly occurred in male and rarely in female, and can be treated by simple excision of tumor because there is no recurrence or malignant change. We describe the clinical and histologic findings with references to other reported cases. We herein report a case of adenomatoid tumor of the uterus that gets an operation under clinical impression of myoma uteri.
가스하이드레이트 포화율 및 감압률에 따른 해리특성 분석
안승희(Seung-Hee An),전보현(Bo-Hyun Chon) 한국가스학회 2015 한국가스학회지 Vol.19 No.3
가스하이드레이트(GH: Gas Hydrate)는 전 세계적으로 약 10조 톤에 이르는 엄청난 양이 대부분 해양의 대륙사면에 부존되어 있으나(동토 지역 : 2 %, 해양 대륙사면 98 %), 현재까지 가스하이드레이트 저류층으로부터 상업화할 수 있을 만큼 가스를 회수하는 기술이 개발되어 있지 않은 실정이다. 일반적으로 회수하는 방법은 감압법, 열자극법, 억제재 주입법 및 치환법 등으로 크게 나누어 볼 수 있으며, 본 연구에서는 가스하이드레이트 포화율과 감압률에 따라서 가스하이드레이트 해리시간 및 가스생산이 어떻게 달라지는 지, 그에 대한 특성을 분석하고자 하였다. 연구분석 결과 감압률과 해리시간의 상관 관계식을 도출(Y = 0.0004X² - 0.499X + 176.86)할 수 있었고, 또한 감압률이 클수록 메탄생산량이 좋다는 것을 알 수 있었지만(감압률 40% 대비 50%에서 메탄가스 생산량이 46.2% 향상), 감압률이 60%에서는 오히려 생산량이 줄어드는데, 이는 가스하이드레이트 재형성에 기인한 것으로 판단된다. The gas hydrate of 10 trillion tons are buried under continental slope in the world(permafrost : 2%, marine continental slope: 98%), but technology for the the commercial gas recovery has not developed yet. There are normally four representative recovery methods: depressurization method, thermal stimulation method, inhibition injection method, and displacement method. This study focuses on change of dissociation time and gas production according to gas hydrate saturation rate and depressurization rate. It was found that the correlation between depressrization rate and dissociation time was like as Y = 0.0004X² - 0.499X + 176.86. It was also found that the bigger depressurization rate is, the better production is(methane gas is produced over 46.2% at depressurization rate 50% compared with 40%). However, on the contrary to this, it is presumed that gas production is decreased at 60% due to gas hydrate reformation.
현장여건에 따른 터빈 유량계와 오리피스 유량계의 정확도 비교
안승희(Seung-Hee An),허재영(Jae-Young Her) 한국유체기계학회 1999 유체기계 연구개발 발표회 논문집 Vol.- No.-
Orifice flow meters are frequently used for measuring gas flow in gas industry. However, to insure the accuracy of the measurement, a certain length of the meter run at the upstream of the flow meter is required. The objective of this study is to analyze flow measurement errors of the orifice flow meter quantitatively for shorter lengths of the meter runs than those suggested in the standard manuals with variation of diameter ratio(β ratio) and flow rate.<br/> The test results showed that the flow measurement errors of the orifice meter were inversely proportional to the diameter ratio. In other words, when the diameter ratio is 0.3 and 0.7, the measurement error is -7.3% and -3.5%, respectively. the main reason of the measurement error is due to the swirl effect from the configuration of the meter run at the upstream of the flow meter. In case the length of the meter run is shorter than that suggested in the standard manuals, the swirl effect is not removed completely and it affects the flow meter's performance. As mentioned above, the less the pipe diameter ratio, the more the flow measurement error. It means that the swirl effect on the orifice meter increases as the β ratio decreases.
천연가스 계량설비에서 발생하는 유량 헌팅 현상 원인 분석
안승희(Seung-Hee An),허재영(Jae-Young Her),정종태,신창훈 한국유체기계학회 2005 유체기계 연구개발 발표회 논문집 Vol.- No.-
KOGAS(Korea Gas Corporation) has about a hundred of local stations to supply natural gas to the city gas companies and the power stations. As some severe flow fluctuation phenomena are observed in several governor stations, the investigation about the reasons and factors which are relating to flow fluctuation has been started. Some field surveys hav been carried out and experimental studies have been performed to find the fluctuation mechanism. As a result, it is found that the flow fluctuation is related with the length of straight pipe in front of the meter, the size of the header pipe and the variation of demand at the city gas company and the power station. Furthermore, it is also proved that both the length of the transmitter cable and the status of the coating of signal transmission cable do not affect flow fluctuation, but the measurement range of the differential pressure transmitter influences flow fluctuation. On the other hand, as the averaging the flow fluctuation is converged to less than 0.1 % in almost all of the cases, it is concluded that the quantity of flow fluctuation do not relates to metering accuracy directly.
안승희(An, Seung-Hee),박승수(Park, Seoung-Soo),신창훈(Shin, Hoon-Chang),김병주(Kim, Byung-Joo),이정환(Lee, Jeong-Hwan) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.10
As a future clean substitute energy, the Gas hydrate development projects are world widely carried out to prepare the shortage of petroleum and natural gas resources. The OIIP of gas hydrate is estimated approximately 10 Trillion LNG equivalent ton and it reaches almost the amount of 5 thousand years use for the world people. To develop the commercial production technology, several research projects like Malik and Alaska project have been carried by several advanced countries and teams, but nobody have succeeded it yet due to the technical problems and the high risks. The technologies developed up to now for the hydrate production are categorized to four methods, such as depressurization method, thermal recovery method, inhibitor injection method and replacement method. As these methods are highly related to the costs and the environmental problems, many other researches including the safety, environment and disaster prevention are actively fulfilled as well.