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유류오염토양 정화를 위한 토양세정기술의 적용성 기초연구
강희천(Hui-Cheon Kang),김정대(Joung-Dae Kim),한병기(Byeong-Gi Han),서승원(Seung-Won Seo),신철호(Chul-Ho Shin),박준석(Joon-Seok Park) 한국유화학회 2015 한국응용과학기술학회지 Vol.32 No.4
본 연구는 실제 유류오염토양을 in situ 토양세정법으로 정화시 기술 적용성을 평가하기 위한회분식 기초연구로 적정 계면활성제의 종류와 농도를 결정하고자 하였다. 증류수만의 진탕효과로 인한TPH 제거는 약 30%이었으며, 계면활성제 희석시 사용되는 용액으로는 증류수를 사용한 경우에 비하여 지하수(해수 혼합)의 유입으로 인하여 약 2~6%의 효율저하가 나타났다. 토양과 계면활성제 용액비는회분식 실험에서 TPH 제거효율에 미치는 영향이 미미하였다. 단독 또는 혼합 계면활성제 농도를 0.1~4.0 wt%까지 변화시켜 세정한 결과 종류별로는 Tween-80, SWA-1503, SWA-1503+SDS에서 평균 제거율이 80% 이상으로 대체적으로 높은 효율을 보였으며, 농도에 따른 차이는 크지 않아 0.1 wt%농도를 최적 농도로 판단하였다. This research was performed to evaluate the feasibility of in situ soil flushing for TPH-contaminated soil remediation. It was conducted in batch test as fundamental research for in situ soil flushing. The 30% of initial TPH concentration was removed by shaking only in batch test. The removal efficiency of TPH in case of groundwater as surfactant dilution solution was approximate 2~6% lower than that of distilled water. Mixing ratio of soil to surfactant solution did not practically effect on the TPH removal efficiency. In the experiment of using single or mixed surfactant solution with 0.1~4.0 wt%, Tween-80, SWA-1503, SWA-1503+SDS showed averagely over 80%. It was determined that the optimum surfactant concentration was 0.1 wt% because there was no significant difference between concentrations of 0.1~4.0 wt%.
강희천(Hui-Cheon Kang),한병기(Byeong-Gi Han),김정대(Joung-Dae Kim),서승원(Seung-Won Seo),신철호(Chul-Ho Shin),박준석(Joon-Seok Park) 한국청정기술학회 2017 청정기술 Vol.23 No.3
본 연구는 오염현장에서 채취한 유류오염토양을 in situ 토양세정법으로 정화시 기술 적용성을 평가하기 위한 컬럼식 실험이다. 실험에 사용한 오염토양의 토성은 사토(sand)이었으며, 초기 TPH 오염농도는 9,369 mg kg<SUP>-1</SUP>이었다. 세정용액으로 0.1% Tween-80을 사용하였으며, 반응기로는 아크릴 원형컬럼과 유리 시린지컬럼을 사용하였다. 아크릴 원형컬럼 실험에서 0.1% Tween-80을 1 PV 주입하였을 때 토양 TPH의 35%가 제거되었고 이후 5 PV까지도 제거효율이 약 40% 정도로 큰 증가가 나타나지 않았으나 7 PV 주입하였을 때 약 60%가 제거되었다. 아크릴 원형컬럼 대신 유리 시린지컬럼을 사용하여 체류시간을 증가시키자 5 PV까지는 아크릴 원통컬럼을 사용한 경우보다 제거효율이 전반적으로 약 3 ~ 12% 높았으나 7 PV을 모두 주입하였을 때의 제거효율은 약 60%로 서로 차이가 없었다. 단독 alum과 alum+polymer 혼합응집제를 사용하여 폐세정액을 응집처리한 결과 최적 주입농도는 두 경우 모두 150 mg L<SUP>-1</SUP>인 것으로 나타났다. 응집처리한 Tween-80 폐세정액에 Tween-80을 0.1% 농도로 새로 용해하여 재사용 세정을 실시한 결과의 제거효율은 41.0%로 재사용하지 않은 0.1% Tween-80의 32.0% 보다 약 9% 높게 나타났다. This study was conducted to evaluate the feasibility of in situ soil flushing for TPH-contaminated soil remediation with column test. The soil texture of the soil was sand and the initial TPH concentration was 9,369 mg kg<SUP>-1</SUP>. 0.1% Tween-80 was selected as surfactant solution. And the acrylic and the glass syringe columns were used as reactors. In the acrylic column test, 35% of the initial TPH was removed in 1 PV of flushing and approximately 40% in 5 PV and finally 7 PV showed about 60%. The glass column test showed 3 ~ 12% higher removal efficiency than that of acrylic test until 5 PV of flushing. However, there was no difference in TPH removal efficiency when 7 PV of surfactant was finally flushed. Both of alum only and alum+polymer mixed surfactants showed also the best coagulation efficiency in 150 mg L<SUP>-1</SUP> of concentraion. When Tween 80 was newly dissolved in 0.1% to the recovered solution after the coagulation treatment, the removal efficiency was increased from 32.0% to 41.0% in comparison to the new 0.1% Tween 80 solution without reuse by coagulation treatment.
폐의 환기 - 관류 불균형 측정을 위한 특이 확산기능의 이용
김승호(Seung Ho Kim),윤덕경(Duk Kyung Yun),이승주(Seung Ju Lee),박인원(In Won Park),최병휘(Byoung Whui Choi),허성호(Sung Ho Hue),서승천(Seung Cheon Seo) 대한내과학회 1989 대한내과학회지 Vol.37 No.1
N/A To investigate the ventilation-perfusion inequality caused by height change and smoking, we measured the routine conventional pulmonary function test and diffusing capacity by the single breath mentod in 36 smoking healthy men (>11/2 pack/year) and 29 nonsmoking healthy men. The results were as follows: 1) In nonsmokers, an increase in height significantly decreased the specific diffusing capacity (p<0.05) but did not affect diffusing capacity (p>0.05). 2) The specific diffusing capacity significantly decreased in smokers compared to nonsmokers (p<0.01) but diffusing capacity and FEF 25~75% did not. So we suggest that specific diffusing capacity will be a more useful parameter than diffusing capacity and FEF 25~75% to detect ventilation-perfusion inequality disorders in asymptomatic patients with small airway diseases.
기관지 천식 환자에서 단기간의 부신피질호르몬제 투여가 뇌하수체 및 부신피질 기능에 미치는 영향
김옥란(Ok Lan Kim),서승천(Seung Cheon Seo),허성호(Sung Ho Hue),최병휘(Byung Hue Choi),배혜상(Hae Sang Bae),성천모(Cheon Mo Seong),이재용(Jae Yong Lee),최민석(Min Seok Choi),이원돈(Won Don Lee) 대한내과학회 1989 대한내과학회지 Vol.36 No.1
N/A Short-term, high dose corticosteroid therapy is often required for control of acute asthma episodes. To evaluate possible Hypothalamic-Pituitary-Adrenal (HPA)-axis suppression and recovery after such therapy, we studied 7 patients with adult acute asthma before and at 1, 3 and 7 days after completion of a 12 day course of corticosteroid. Corticosteroid was administered as a loading dose (methylprednisolone which was equivalent to 4 mg of hydrocortisone/kg body weight) and maintenance dose (equivalent to 3mg of hydrrcortisone/kg body weight/6 hours) for 3 days, followed by prednisolone (usual start dose was prednisolone 60 mg as a single daily morning dose). The dose was then reduced in half every 3 days. The function and reserve of the HPA-axis were evaluated with basal plasma cortisol, ACTH and short corticotropin stimulation tests. The results obtained were as follows: 1. Baseline plasma cortisol, ACTH, and cortisol responses to corticotropin before corticosteroid treatment were 10.3±5.6 ㎍/dl, 25.4±8.4 /㎍/ml, and 17.7±6.2 ㎍/dl, respectively. 2. One day after corticosteroid therapy, plasma cortisol and ACTH levels (3.9±2.4 ㎍/dl, 9.2±9.0 pg/ml) were significantly reduced compared to pretreatment levels (p<0.01. p<0.01), but the cortisol responses to corticotropin were preserved. 3. Three days after concluding the corticosteroid therapy, plasma cortisol and ACTH levels had returned to 68.9% and 71.7% of the pretreatment levels respectively, and were restored to near pretreatment baseline levels 7 days after treatment. These data suggest that a brief course of high dose corticosteroid treatment may limit the adrenal component of HPA responses for up to 7 days and patients may be at risk if they encounter major surgery or infection during this time.
김종숙(Chong Sook Kim),박실무(Sill Moo Park),서승천(Seung Cheon Seo),김명식(Myung Sik Kim) 대한소화기학회 1982 대한소화기학회지 Vol.14 No.2
N/A The experimental study was carried out to assess the effect of trithiozine on gastric secretion in rats with the use of Shield rat method. The results were obtained as follows. 1. The volume of basal gastric secretion was 0. 3 cc/hr. in control group, and 0. 2 cc/hr. in trithiozine group. 2. The basal acid secretion was 0.44 Eq/hr. in control group, and 0.28 Eq/hr. in trithiozine group. The volume of stimulated gastric secretion was 0. 67 cc/hr. in control group, and 0.33cc/ hr. in histalog and trithiozine group. 4. The stimulated acid secretion was 2. 7 uEq/hr. in control group, and 0. 95 uEg/hr. in histalog and trithiozine group.
Substance - P 가 흰쥐 위액분비에 (胃液分泌) 미치는 영향
김종숙(Chong Sook Kim),박실무(Sil Moo Park),박병국(Byung Goog Park),서승천(Seung Cheon Seo),김명식(Myung Sik Kim) 대한소화기학회 1982 대한소화기학회지 Vol.14 No.2
N/A The present study was carried out to assess the effects of substance P on gastric secretion in rats. The following results were obtained. 1) The change of gastric juice between control and substance P group was not significant. 2) The greates:t increment of titratable acid output was obtained 30min. and the increasing rate of titratable acid output was ohtained 15 min. to 60 min. After administration of substance P.