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Development of Application of a Landfill Gas Migration Model
Park YC,Lee KK,Park CH,Kim YW 대한자원환경지질학회 1996 자원환경지질 Vol.29 No.3
Numerical model is developed to estimate gas flow in the landfill site. Darcy s law, the mass conservation law, and the ideal gas state equation are combined to compose the governing equation for the steady-state and transient-state gas flows. The finite element method(FEM) is used as the numerical solution scheme. Two-dimensional radial symmetric triangular ring element is used to discretize the simulation domain. The steady state model developed in this study is compared with AIRFLOW that is a commercial model developed by Hydrologic Inc. Mass balance test is performed on the transient gas flow simulation. The developed model is applied to analyze the gas extraction experiment performed by Daewoo Institute of Construction Technology at the Nanjido landfill in 1993. The developed model was registered at Korea Computer Program Protection Foundation.
이관구(KK Lee),오세익(SI Oh),우명룡(MR Woo),성갑규(KK Sung),박준숙(JS Park) 대한산부인과학회 1997 Obstetrics & Gynecology Science Vol.40 No.11
Twin pregnancies have a higher rate of premature delivery than singleton pregnancies and a substantially higher perinatal mortality. Twin gestation complicted by a single anomalous fetus diffculties in obstetric management. Options available to patients include continuing the entire pregnancy, selective termination of the anomalous fetus, or termination of the entire pregnancy. The incidence of one anomalous fetus in twin pregnancy is rare. Gastroschisis is intestinal herniation through a defect in the anterior abdominal wall usual ly to the right of umblicus. There is no sac and the intestines are covered with a thickened inflammatory exudate. Most case of gastroschisis occur sporadically and chromosomal anomaly are less common. A case of one gastroschisis in twin pregnancies diagnosed by ultrasonography is reported with a brief review of the literature.
이관구(KK Lee),오세익(SI Oh),황재웅(JW Hwang),박종호(JH Park),박준숙(JS Park) 대한산부인과학회 1997 Obstetrics & Gynecology Science Vol.40 No.11
The safety and effectiveness of extraperitoneal C/S are controversial , so it has been per-formed for the purpose of training for selected cases . But we think this procedure have some benefit in selected cases. This study was based on retrospective investigation of 300 cases of extraperitoneal cesarean section among 332 cases at Eul Ji Medical hospital, during from Janu-ary, 1995 to December, 1996. The results were as follows;1. The most prevalent age distribution was seen in the age group of 26∼30. 2. The indication for extraperitoneal cesarean section were dystocia(38.3%), previous cesarean section(32.6%), elderly primigravida(12.6%) in orders. 3. In the type of the anesthesia, general anesthesia was 70.7%, epidural anesthesia was 15% and spinal anesthesia was 14.3%. 4. The most common group of operation time was 36∼40minute(34.3%). 5. The post operative complications and maternal morbidities were breast engorgement(21%), peritoneal opening(19.6%), endometritis(4.3%) in orders. 6. Of all cases, the blood transfusion rates was 6%. 7. The most common group of hospital stay was 5∼6 days(82%). 8. In the body weight distribution of infants, the group of 3,000∼3,499gm was the most common(80.7%). 9. Of extraperitoneal cesarean sections, cases of the 5minute Apgar score more than 7 were the most common(99%). 10. The most common failure factor was abdominal and pelvic 11. There was no maternal death case.
이경구(KK Lee),박문일(MI Park),이재억(JA Lee) 대한산부인과학회 1994 Obstetrics & Gynecology Science Vol.37 No.2
Electronic fetal heart rate (FHR) monitoring has become popular method of assessing fetal sell-being. The test using FHR response to externally applied sound, namely acoustic stimulation test (AST), is currently being used as an alternative tool of nonstress test(NST). However, there were only few reports regarding computerized FHR analysis in the AST. Individual subjective analysis of FHR tracings can be replaced with an automated computerized objective analysis system. This computerized analysis system also enable us to interpret the FHR data more quantitatively compared to visual interpretation. Five hundred and fifty normal term pregnancies entered to this study and 84 cases who revealed normal pregnancy outcomes were chosen for active study. After conventional 20-minutes NST, 10-minutes AST was performed in all patients with a programmable acoustic stimulator (90 dB, 500 Hz) which already developed at Hanyang University Hospital. We analyzed the FHR response after acoustic stimulation using our on-line computerized FHR analysis system, HYFM-1 software. We categorized the criteria of FHR acceleration as following 4 combinations; 10 sec-10 bpm, 10 sec-15 bpm, 15 sec-10 bpm, and 15 sec-15 bpm. The changes of baseline FHR, variability, number of fetal movements, and loss of singal were also analyzed using HYFM-1. When each duration of FHR acceleration is fixed, significant increments were observed in each 15 bpm combination groups. It would be suggested that the bpm, duration of FHR acceleration was more influenced by acoustic stimulation than the time, duration of FHR acceleration. This quantitative analysis of FHR after acoustic stimulation would be helpful in the study of mechanism of FHR acceleration.
박성철(SC Park),이경구(KK Lee),유중배(JB Yoo),조삼현(SH Cho),김경태(KT Kim),황윤영(YY Hwang),김두상(DS Kim) 대한산부인과학회 1989 Obstetrics & Gynecology Science Vol.32 No.1
저자는 정상임부의 자궁경부 길이 및 내경구 개대정도를 측정하기 위하여 1987년 3월1일부 터 1987년 8월 31일까지 정상임부 162명과 대조군으로 비임신 여성 68명을 대상으로 비교분 석한 결과 다음과 같은 결론은 얻었다. 1. 가임 연령의 비임신 여성에서 평균 자궁경부 길이는 2.8+-0.6cm이었으며 연령별 평균치 는 통계학적으로 유의한 차이가 없었고 (p>0.05), 임부에서의 평균 자궁경부 길이 3.6+-0.9cm 에 비교하여도 통계학적으로 유의한 차이가 없었다. (p=0.068) 2. 자궁경부 길이는 초임부에서 1.8-5.9cm이었고 그평균은 3.5+-0.9cm이었으며 경산부에서 는 2.0-5.9cm이엇고 그 평균은 3.8+-0.8cm이었다. 임신 전 기간(5주-41주)에서 초임부와 경산 부 간의 자궁경부 길이의 비교는 각각 통계학적으로 유의한 차이가 없었다. 또한 임신주수 에 따른 자궁경부 길이의 변화도 초임부와 경산부 각각에서 통계학적으로 유의한 차이가 없 었다. 3. 자궁경부 내경구 개대는 초임부에서 0-1.2 cm이었고 그평균은 0.10+-0.0cm이었으며 경산 부에서 0.-1.4cm이었고, 그 평균은 0.02+-0.05cm이었다. 임신 제 5주-36주에서 초임부와 경산부 간의 자궁경부 내경구 개대의 비교는 통계학적으로 유의한 차이는 없었으며 임신 37주-41주에서 초임부보다 경산부에서 유의하게 길었다. 또한 임신주수에 따른 자궁경부 내경구 개대의 변화도 초임부와 경산부 각각에서 통계학적으로 유의한 차이가 없었다. The ultrasonographic measurements of the cervical length and dilatation in normal pregnancy can provide an objective assessment of anatomical shortening associated with premature labor and delivery. One hundred sixty-two uncomplicated pregnant women underwent serial ultrasonographic cervical length and dilatation mesurements by gestational age at the Department of Obsterics and Gyunecology, School of Medicine Hanyang University Hospital from March 1st, 1987 to August 31st 1987. In this group , 97 were nulliparas and the remainders (n=65) were multiparas. As a control group , sixty-eight normal non-pregnant women (20-40years old) were also studied by the same method. The mean cervical length and dilatation were compared between nulliparas and multiparas, and between the pregnant and non-pregnant women. The results were as follows; 1. Nomograms of cervical length and dilatation by gestational age were illustrated. 2. The mean cervical length of nulliparas were similar to those of multiparas from 5 to 41 weeks of gestation (3.5+-0.9 cm vs 3.8+-0.8cm P>0.05). there was no significantly difference of cervical length between the pregnant and non-pregnant women (3.6+-0.9cm vs 2.8+-0.6 cm p>0.05). 3. the mean cervical dilatation of nulliparas were similar to those of multiparas from 5 to 36 weeks of gestation (0.10+-0.0cm vs 0.20+-0.5 cm p>0.05).
자발성 뇌실질내 혈종 치료에 대한 Pelorus System을 이용한 뇌정위적 흡인술과 개두술 간의 비교 분석
장태안,박경우,정남,조경기 대한신경외과학회 1990 Journal of Korean neurosurgical society Vol.19 No.4
To date no definite conclusion has been reached regarding the suitability of treatment for spontaneous intracerebral hematoma. With remarkable development of CT gurded stereotatic technique, stereotatic evacuation is in preference to conventional craniotomy due to local anesthetics and minimal invasion. Authors present the result of comparative study on conventional craniotomy vs stereotatic evacuation using Pelorus system with urokinase irrigation and drainage from Jan. 1985 to July 1989 (102 conventional craniotomy and 35 CT guided stereotatic evacuation). Stereotatic evacuation revealed better result compared to conventional craniotomy in activity of daily living(ADL) and improvement of motor weakness, and it had not influenced by hematoma location and volume. Urokinase irrigation using catherter with distal multiple side hole could remove the remained hematoma rapidly and easily. These results may provide that stereotatic evacuation with urokinase irrigtion can be one of the definite treatment of spontaneous intracerebral hematoma.