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.

자궁에 발생한 선종양종양

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.

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.

가스하이드레이트 생산기술 개발동향 분석

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.

KOGAS 해저생산시설(SURF) 설계 연구 현황

안승희(Seung Hee An),김영근(Young Keun Kim),류근창(Keun Chang Ryu) 한국가스학회 2017 한국가스학회 학술대회논문집 Vol.2017 No.5

오리피스 플레이트 역방향 설치시의 오리피스 유량계 유량측정 오차

안승희(Seung-Hee An),허재영(Jae-Young Her) 한국가스학회 2001 한국가스학회 학술대회논문집 Vol.2001 No.10

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.

산과영역에서 수혈거부 환자의 무수혈적 치료에 대한 임상적 고찰

박승준 ( Seung Jun Park ),김지영 ( Ji Young Kim ),안승희 ( Seung Hee An ),김미경 ( Mi Kyung Kim ),차상헌 ( Sang Heon Cha ),최규연 ( Kyu Yeon Choi ),이정재 ( Jeong Jae Lee ),이임순 ( Im Soon Lee ) 대한산부인과학회 2008 Obstetrics & Gynecology Science Vol.51 No.1

목적: 출혈이 유발되는 산과적 시술을 받은 수혈거부 환자들의 임상적 특징을 분석하고 무수혈적 치료 효과를 분석하여 향후 치료시 지표를 확립하고자 하였다. 방법: 2000년 1월 1일부터 2006년 3월 31일까지 본원 무수혈 센터를 방문하여 산과적 시술을 받은 환자 중 출산을 목적으로 한 127명을 대상으로 수혈거부이유, 환자의 연령, 분만과 수술비율, 환자의 혈색소치 비교, 실혈량, 무수혈적 치료 여부, 입원기간, 수혈여부, 환자의 결과 (합병증 및 사망여부 포함) 등을 분석하였다. 무수혈적 치료는 약물치료 (재조합 에리쓰로포이에틴, 아프로티닌, 보트로파제, 트라넥삼산, 베노페롬)와 자가수혈, 전기소작술을 이용하였다. 결과: 127명 중 1명은 타 병원에서 분만하여 제외하고 126명 중 질식 분만 산모는 57명, 제왕절개산모는 69명이었다. 질식 분만 산모의 나이는 32.2 (±1.3)세이고, 제왕절개 산모의 나이는 33.5 (±1.2)세로 약 1.3세차이가 있었다. 일차 제왕절개술과 이차 이상의 반복제왕절개술의 비율은 비슷하였고, 일차 제왕절개술의 이유는 아두골반불균형에 의한 진행장애가 가장 많았다. 수혈적응 환자 26명 중 자궁무력증이 16명으로 가장 많았고, 수혈적응의 이유는 수술 후 혈색소 수치가 8.0 g/dL 이하로 낮아진 경우가 20명으로 가장 많았다. 수혈적응 환자군이 비적응 환자군보다 입원기간이 2일 더 길며 (7.6±0.5 day vs 9.7±0.6 day) 출혈량도 약 2배 많았으며 (464.6±34.2 ml vs 920.5±214.2 ml) 직접 수혈을 받은 경우는 없었다. 합병증으로 급성 신부전증 1명, 범발성 혈액내 응고장애 1명이었으며 사망한 경우는 없이 퇴원하였다. 결론: 산과 영역에서 수혈거부 환자들의 임상적 특징을 분석하였고 무수혈 치료를 시행하였다. 특히 이슈가 되고 있는 무수혈적 치료시 적극적인 치료를 하였을 경우 치료하지 않은 경우보다 더 적은 혈색소 감소 효과를 확인하였고 출혈환자에서 선택적 무수혈적 치료가 가능함을 확인하였다. Objective: The goal of this study is to analyze the clinical manifestation of obstetrical patients who refused transfusion of any blood component. Through this analysis, we could define the guideline of non-blood transfusion treatment during the obstetrical procedure. Methods: 127 patients who visited our non-blood transfusion treatment center and had obstetrical procedures from 1 Jan. 2000 to 31 March 2006 participated in this study. They were retrospectively analyzed according to the following indexes; the reason of refusing blood transfusion, age, ratio of vaginal delivery to Cesarean section, comparison of hemoglobin level, volume of blood loss, presence of bloodless treatment, days of hospitalization, presence of blood transfusion, consequence of patient (including complications and deaths). Bloodless treatment at the hospital are medical method (recombinant human erythropoietin, Aprotinin, Hemocoagulase, Tranexamine acid, Venoferrum), Autotransfusion and Electrocauterization. Results: Among 126 patients (except for 1 patient who was delivered at the other hospital), the vaginal delivery group consisted of 57, and the Cesarean operation group was 69. The most common cause of primary caesarean section was arrest disorder of cephalo-pelvic disproportion. Among 26 patients qualified for indication of transfusion, uterine atony had the highest number of patients at 16. Among the indication of transfusion, low hemoglobin level (≤8.0 g/dL) after operation had the highest number of patients at 20. Patients qualified indication of transfusion had twice more blood loss (464.6±34.2 ml vs 920.5±214.2 ml) and two more days of hospitalization (7.6±0.5 day vs 9.7±0.6 day) compared with those of non-qualified for indication of transfusion. Nobody received direct transfusion of blood component. There were no death but acute renal failure in one patient, and DIC (disseminated intravascular coagulation) in another patient as complications. Conclusions: This study analyzed the clinical manifestations of patients who refused a blood transfusion in obstetrics. Especially, when the non-blood transfusion treatment was performed, which had been an issue in recent times, more active treatment showed less reduction of hemoglobin level than no treatment. This study also confirmed that bleeding patients can be treated by selective non-blood transfusion treatment.

오리피스 유량계와 터빈 유량계의 직관부길이와 유동안정기에 관한 연구

허재영(Jae-Young Her),안승희(Seung-Hee An),이강진(Kang-Jin Lee),이승준(Seung-Jun Lee) 한국유체기계학회 2000 유체기계 연구개발 발표회 논문집 Vol.- No.-

Orifice meters and turbine 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 meter quantitatively for shorter lengths of the meter runs than those suggested in the standard manuals with variation of diameter ratio(βratio) and flow rate and also to analyze flow measurement errors of the turbine meter with and without straightener.<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, 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 βratio decreases.

고령 여성에서 발생한 골반내 결합조직형성 소원형세포 종양

박재연 ( Jae Yeon Park ),안승희 ( Seung Hee An ),김미경 ( Mi Kyung Kim ),차상헌 ( Sang Heon Cha ),최규연 ( Gyu Yeon Choi ),이정재 ( Jeong Jae Lee ),이임순 ( Im Soon Lee ) 대한산부인과학회 2009 Obstetrics & Gynecology Science Vol.52 No.7

Peritoneal desmoplastic small round cell tumor is a very rare and highly aggressive neoplasm that predominantly strikes male children and young adults. It frequently presents as a large abdominal mass with widespread peritoneal involvement at diagnosis. We report one case of desmoplastic small round cell tumors in the pelvis in a old aged woman with a brief review of literature.