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이필구,심창수,윤태양,Lee, Pil Goo,Shim, Chang Su,Yoon, Tae Yang 한국강구조학회 2003 韓國鋼構造學會 論文集 Vol.15 No.6
강합성교량에서 19mm 또는 22mm 직경을 갖는 전단연결재가 일반적으로 사용되고 있다. 강교 상세의 단순화와 향후 바닥판 제거의 용이성 및 프리캐스트 바닥판 전단포켓의 효율적인 배치를 위해서는 대직경 스터드 전단연결재가 필요하다. 현재의 전단연결재 설계범위를 넘어서는 대직경 스터드 전단연결재에 대한 push-out 실험을 통해서 정적거동에 관한 항목들을 검토하고 기존 설계식과의 비교를 수행하였다. 25, 27, 30mm 직경의 스터드에 대한 전단실험을 통해서 탄성영역에서의 전단강성을 평가하고 세 개의 직선으로 구성된 하중-상대변위 곡선을 제안하였다. 파괴시의 극한상대변위를 평가하고 극한강도를 유로코드-4의 설계식과 비교하여 설계의 안전율을 평가하였다. 또한 30mm 스터드의 경우는 용접과 콘크리트 지압능력의 개선이 필요한 것으로 나타났다. Shear studs with a diameter of 19mm or 22mm are typically used in steel-concrete composite bridge. For the simplification of details in steel bridges, the convenience of removing concrete slab, and the efficient distribution of shear pockets for precast decks, large studs can be an excellent alternative. Through push-out tests on large stud shear connectors that transcend the limitation of current design codes, static behavior was investigated and comparisons with design equations performed. The shear stiffness of the connectors in elastic range and trilinear load-slip curves were proposed after shear tests on 25mm, 27mm, and 30mm studs. The ultimate slip capacity and ultimate strength of large studs were also evaluated, with the test results revealing conservative values for the design shear strength in Eurocode-4. For 30mm stud shear connectors, the welding quality and bearing capacity of concrete slab should be improved.
이필구(Pil-Goo Lee),이병욱(Byung-Ook Lee),최문종(Moon-Jong Choi),이충헌(Choong-Heon Lee),남궁기(Kee Namkoong) 한국중독정신의학회 2000 중독정신의학 Vol.4 No.1
Acamprosate (calcium bis acetylhomotaurinate) is a new medication that appears to be clinically useful in the treatment of alcohol dependence. Although it has proved effective in reducing relapse into drinking in clinical trials its exact neurochemical mechanism of action is not clear yet. Evidence is presented that the drug does not act in any of the conventional ways to reduce alcohol intake or psychotropical medication and it is proposed that it may be a novel kind of agent that suppresses craving. On the basis of its known pharmacological effects in pre-clinical studies it is suggested that acamprosate may reduce craving that is associated with conditioned negative withdrawal. Current trends of the prescriptions through European countries show its therapeutic effectiveness and availability. In addition to the potential therapeutic value of acamprosate, the drug may be useful because work directed toward understanding its mechanism of action may shed light on some of the fundamental processes that constitute alcohol abuse and relapse in weaned alcohol dependent patients.