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박도현,이영수,김희택,류경옥 ( Do Hyeon Park,Young Soo Lee,Hee Taik Kim,Kyong Ok Yoo ) 한국화학공학회 1992 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.30 No.6
In order to examine the effects of experimental variables on the oxidative regeneration of sulfided sorbents by H₂S, effluent gas (SO₂) was analyzed by G.C. with variation of reaction conditions and oxidized sorbents were characterized by XRD, SEM, and TGA-DTA. The reactivity of oxidative regeneration was maximum at 750℃ and it was revealed that the Fe₂O₃additive played an important role from the TGA-DTA analysis. Total SO₂ uptake was increased linearly as oxygen increased till 10 vol% and it was decreased drastically as oxygen increased. When the total flow rate was increased, total SO₂ uptake was increased linearly till 125 ml/min and thin-film mass transfer resistance was negligible above 100 ml/min. From the oxidative regeneration of sulfided sorbents with different particle sizes, it was found that for small particle, the SO₂ uptake was little and that the structural change formed during the sulfidation acted as the O₂ diffusion barrier. From the sulfidation at 650℃ after one sulfidation-regeneration cycle, it was found that regenerated sorbent at 750℃ was effective.
박도현(Do-Hyeon Park),김완석(Wan-Suk Gim) 한국명상학회 2019 한국명상학회지 Vol.9 No.1
본 연구의 목적은 자비명상의 시작 대상을 자기와 타인으로 달리하였을 때 자비심 계발에 차이가 있는지를 알아보고자 하는 것이다. 수치심처럼 부정적인 자기개념을 가진 사람들은 특히 자기 자신에 대한 자비명상을 어려워한다는 점에 착안하여, 자비명상 대상의 순서에 따른 차이를 검증하였다. 이를 위해, 자기자비를 먼저 하는 자기자비명상 프로그램과 타인자비를 먼저 하는 타인자비명상 프로그램의 두 개의 프로그램을 만들었다. 참가자 71명을 모집하여 두 개의 집단에 무선적으로 할당하여, 8주간 두 개의 프로그램을 실시하였다. 자비심은 그 대상에 따라 타인자비, 지인자비, 자기자비로 세분화하여 정의한 후, 프로그램 실시 전부터 시작하여 종료시까지 2주 간격으로 총 5회에 걸쳐 측정하였다. 결과는 수치심이 높은 사람들의 경우에는 타인자비 프로그램집단이 자기자비 프로그램집단에 비해 타인자비 점수의 향상이 더 큰 것으로 나타났으며, 수치심이 낮은 사람들의 경우에는 이러한 차이를 보이지 않았다. 한편, 지인자비 및 자기자비 점수는 수치심 수준과 두 개의 프로그램에 따른 차이가 없는 것으로 나타났다. 논의에서는 타인자비의 계발에서 자비명상 대상의 순서는 어떻게 하는 것이 효과적일지를 다루었다. 본 연구결과는 높은 수치심과 같이 부정적인 자기개념을 가진 사람들의 경우에는 긍정적인 타인을 위주로 먼저 자비수행을 하는 것이 더 효과적일 수 있음을 시사한다. 이제까지 자비명상 연구는 단순히 그 효과를 검증하는 것을 위주로 하였으나, 향후에는 이를 넘어서서 효과의 기제와 치료적 개입전략에 대한 연구로 나아가야 함을 제안하였다. The purpose of this study is to examine whether there is a difference in the cultivating of compassion when the object of Loving-kindness & Compassion Meditation(LCM) is different between self and others. In particular, it is known that people with negative self-concepts, such as shame, have a difficulty on practicing LCM toward themselves, so we verified differences in the order of the objects of LCM. We designed two programs: a self-LCM program, which the participants practice LCM toward themselves first, and a other-LCM program, which the participants practice LCM toward positive others first. 71 Participants were randomly assigned to two groups of each programs designed for 8-weeks. The compassion was conceptualized three different scales, that is, compassion toward strangers and close others, and self-compassion, and measured five times at intervals of two weeks from pre to post of the program. The results showed that the other-LCM program was more effective for the cultivating of compassion toward strangers for people with high shame. On the other hand, there was no differences between two programs in compassion toward close others and self-compassion in term of the level of shame. We discussed what would be the order of object of LCM in the cultivating of compassion for strangers. The results suggest that people with negative self-concept such as high shame, may be more effective when they practice LCM toward positive others first. In the future study of LCM, not only verifying the effect, but also finding the mechanism of effect and the therapeutic intervention strategy.
간내담석 환자에서 자기공명 담도췌관조영술의 유용성 및 제한점
박도현 ( Park Do Hyeon ),김명환 ( Kim Myeong Hwan ),이상수 ( Lee Sang Su ),김선영 ( Kim Seon Yeong ),김정호 ( Kim Jeong Ho ),김현준 ( Kim Hyeon Jun ),배종석 ( Bae Jong Seog ),서동완 ( Seo Dong Wan ),이성구 ( Lee Seong Gu ),김아영 대한소화기학회 2003 대한소화기학회지 Vol.42 No.5
Diagnosis of bile duct strictures as well as detection and localization of hepatolithiasis is important for an effective treatment of hepatolithiasis. For this purpose, endoscopic retrograde cholangiopancreatography (ERCP) and percutaneous transhepatic cholangiography (PTC) have been preferred as the diagnostic modalities of choice for hepatolithiasis. At present, magnetic resonance cholangiopancreatography (MRCP) is rapidly replacing ERCP. To determine the usefulness and limitation of MRCP for detecting hepatolithiasis and biliary strictures, we compared the result of MRCP with that of percutaneous transhepatic cholangioscopy (PTCS) as the standard reference. Methods: Sixty-six patients with primary hepatolithiasis who underwent both MRCP and PTCS were enrolled. All patients underwent PTCS within 2 weeks of MRCP. The results of MRCP were reviewed by radiologists who were unaware of the clinical information about the location of hepatolithiasis and the presence of biliary strictures. Results: The sensitivity and specificity of MRCP for detecting intrahepatic stones were 72.4 and 90%, respectively. The sensitivity of MRCP for depicting intraheptic bile duct strictures was 64%. The overall agreement between MRCP and PTCS for intrahepatic stones showed a good reliability (kappa value=0.64, p<0.05). The agreement of MRCP for hepatolithiasis with intrahepatic bile duct strictures with reference to PTCS showed a moderate reliability (kappa value=0.47, p<0.05). Imaging findings such as pneumobilia and hepatic parenchymal atrophy were related to false positive results in location of hepatolithiasis (p<0.05). Conclusions: MRCP has a good agreement rate in evaluation of intrahepatic stones and a moderate agreement rate in intrahepatic strictures, compared to PTCS. (Korean J Gastroenterol 2003;42:423-430)
염색폐수의 유기물 부하율 및 담체 충진율에 따른 PEMT-MBBR의 COD 제거특성
박도현 ( Do-hyeon Park ),정병길 ( Byung-gil Jung ),윤태경 ( Tae-kyung Yoon ) 한국환경기술학회 2018 한국환경기술학회지 Vol.19 No.5
본 연구는 담체를 이용한 유동상 생물막 공정인 PEMT-MBBR 공정 내 담체 충진율과 염색폐수의 유기물 부하율에 따른 COD 제거특성을 평가하는데 그 목적이 있다. 글루코스를 이용하여 합성염색폐수를 조제하여 사용하였으며, 반응기 내 담체로는 폴리에틸렌 재질의 유동상 담체(PEMT)를 적용하였다. 실험 결과 PEMT-MBBR 내 유입 유기물 부하량이 증가할수록(HRT가 감소할수록) COD 제거속도는 증가하였지만, COD 제거효율은 급격히 감소하는 것으로 나타났다. PEMT-MBBR 내 담체 충진율이 70 % 일 때 MLSS 농도는 거의 7,000 mg/L 까지 증가하였다. 또한 수중 SBF의 양은 유기물부하량 8 kg/m<sup>3</sup>·day 까지는 증가하다가 그 이상이 되면 오히려 감소하는 것으로 나타났다. 본 실험에서 나타난 유동상 생물막법의 특성을 활용하면 대규모 공정에 적용할 수 있을 것이다. COD removal characteristics as functions of organic loading rate(OLR) of synthetic dyeing wastewater and carrier volume were studied using a lab-scale moving-bed biofilm reactor (MBBR). Polyethylene-based modular tube(PEMT) was used as a carrier material inside the reactor. The experimental results showed that COD removal rates were increased with increasing OLRs of synthetic dyeing wastewater in a PEMT-MBBR, but COD removal efficiencies were decreased sharply. When the carrier volume in the MBBR was reached to 70 %, the MLSS concentration was increased to almost 7,000 mg/L. Also, the suspended biofilm(SBF) concentration was increased until the OLR was reached to 8 kg/m<sup>3</sup>·day, but then decreased when OLR was 16 kg/m<sup>3</sup>·day. The results of this study could be scaled up and used as a design tool for the moving-bed biofilm systems of the dyeing wastewater treatment processes.