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이재훈,주수일,류태하,최재호,Lee, Jae-Hoon,Joo, Soo-Il,Ryu, Tae-Ha,Choi, Jae-Ho (사)한국토질및기초기술사회 2006 기술발표회 Vol.2006 No.-
본 글은 부산-김해간 경량전찰 건설공사의 기초설계시 현장타설말뚝 기초의 지지층을 모래자갈층으로 적용한 사례이다. 낙동강 유역은 퇴적층이 발달하여 풍화암 이상의 기반암층이 지표하 60~80m 이후에서 출현하며, 40m 이상의 심도에서 매우 조밀한 상태의 모래자갈층이 10-20m 두께로 분포하고 있어, 모래자갈층을 관통하여 기반암에 말뚝기초를 지지할 경우 기초공사에 상당한 기간이 소요될 뿐만 아니라, 시공성과 경제적인 측면에서 매우 불리하다. 이에 대한 개선방안으로 대구경 현장타설말뚝을 N치 50 이상의 조밀한 상태의 모래자갈층에 지지하였으며, 인근현장의 적용사례, 기초 구조물 안전성 검토 및 현장재하시험 등의 비교분석을 통하여 모래자갈 지지층의 적정성을 확인하였다. 따라서, 풍화암 이상의 지지지반 출현심도가 60m 이상으로 매우 깊고, 지지지반 상부에 모래자갈층이 두껍게 분포하는 경우에는 모래자갈층을 말뚝기초의 지지층으로 활용하는 방안이 시공성 및 경제성 측면에서 합리적이라 판단된다.
만성 허혈 후 통증모델에서 발생한 건측의 이질통과 척수의 중추감작
곽경화 ( Kyung Hwa Kwak ),정경영 ( Kyung Young Jung ),최지영 ( Jy Young Choi ),류태하 ( Tae Ha Ryu ),여진석 ( Jin Seok Yeo ),박성식 ( Sung Sik Park ),임동건 ( Dong Gun Lim ),김시오 ( Si Oh Kim ),백운이 ( Woon Yi Baek ),홍정길 ( Ju 대한마취과학회 2009 Korean Journal of Anesthesiology Vol.56 No.4
Background: Mirror-image allodynia is a mysterious phenomenon that occurs in association with many clinical pain syndromes including complex regional pain syndromes (CRPS). Underlying mechanisms for the development of such pain are still a matter of investigation. Several studies suggest that activation of the N-methyl-D-aspartate (NMDA) receptor is essential for central sensitization as a base for persistent pain. The aim is to assess whether alteration of NMDA receptor expression correlates with the contralateral allodynia in the chronic post-ischemia pain (CPIP) model rats representing CRPS-Type I. Methods: Application of a tight-fitting tourniquet for a period of 3 hours before reperfusion produced CPIP in male Sprague-Dawley rats. The mechanical paw withdrawal thresholds to von Frey stimuli (using a dynamic plantar aesthesiometer) were measured as pain indicators in ipsilateral and contralateral hindpaws. Phosphorylation of the NMDA receptor 1 subunit (pNR1), assessed with Western blot, was measured in the contralateral L4-6 spinal cord. Results: Ipsilateral and contralateral mechanical allodynia is present at 4 hours after reperfusion, peaked at 3 days, and continued for 7 days after reperfusion. The relative density of pNR1 of CPIP rats significantly decreased in the contralateral L4-6 spinal cord compared to baseline value (P<0.05). There was significant correlation between paw withdrawal threshold and the relative density of pNR1 (ipsilateral; R2=0.75, P<0.01, contralateral; R2=0.60, P<0.01). Conclusions: These data suggest that pNR1 is correlated to the contralateral mechanical allodynia in CPIP rats. (Korean J Anesthesiol 2009;56:419~24)
박용원,김병일,류태하 明知大學校 産業技術硏究所 1995 産業技術硏究所論文集 Vol.14 No.-
Vertica1 drain method is being used as effective ground improving technique for soft clay layer with small shear strength and high compressibility. Theoretically, consolidation time of ground can be decreased by decreasing drainage path and increasing well diameter. In reality, however, smear effect due to the drain installation and the well resistance cause consolidation time delay. In this study, we have studied on the inf1uence of the smear effect and the well resistance of vertical drain on the consolidation time. Theories of Barron, Hansbo, Onoue are used in the estimation of the consolidation time and compare the results changing weak layer thickness, diameter ratio of smear zone, coefficient ratio of consolidation with respect to sand drain, paper drain, pack drain, and SCP. In this paper we found that the well resistance has great influence on increasing the consolidation time in paper and pack drain. And sand drain and SCP, the smear effect has great influence on increasing the consolidation time and well resistance effect is negligible.