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신양현(Yang-Hyun Shin),김찬묵(Chan-Mook Kim),사종성(Jong-Sung Sa) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_2
This paper presents the study of equivalent material properties with visco-elastic material properties.. The goal of the study is anticipation of equivalent material properties (natural frequency, loss factor, and Young's modulus) in damping materials treatment. Through the equivalent material properties, we must design FEM model with constrained layer damping material. And equivalent material properties saved solving time in FEM model. We could acquire the visco-elastic material properties (shear modulus, loss factor) to experiment the oberst test using modified ASTM. And we can anticipate resonance of constrained beam with shift ratio between bare beam and constrained beam. Equivalent material properties of constrained beam is obtained from shear parameters (g is made of shear modulus of visco-elastic material, length, and wave number) at resonance of constrained beam. FEM model of visco-elastic material must be designed solid model. We didn't design solid FEM model but equivalent shell FEM model. So we saved solving time and convenience of FEM model mesh.
증례보고 : 척추 경막외 병용마취 후 발생한 간대성 근경련
김수환 ( Soo Hwan Kim ),이기영 ( Ki Young Lee ),이수현 ( Su Hyun Lee ),윤덕미 ( Duck Mi Yoon ),신양식 ( Yang Sik Shin ) 대한마취과학회 2007 Korean Journal of Anesthesiology Vol.52 No.1
Two cases showed intermittent myoclonic movements in the lower extremities after receiving combined spinal-epidural anesthesia (CSE). Case 1: A 73-year-old female patient, underwent CSE, for a total knee replacement of right leg. Anesthesia was performed at L3/4 interspace with 2.0 ml of 0.5% tetracaine, mixed with normal saline and patient`s own cerebrospinal fluid and epinephrine 1:200,000. Epidural catheter was inserted 3 cm-cephalad. Patient-controlled analgesia regimen was made with sufentanil 100 ug, 0.75% ropivacaine 30 ml, and naloxone 0.55 mg, with normal saline. The infusion regimen began at the end of the surgery, finished uneventfully after one and half hours. After 3 hours, the patient developed symmetric hip adductions of large amplitude and extensions of both legs for 2 to 3 seconds. Until valproate 800 mg was given, the movements repeated at 1 to 2 minute intervals for 3 hours. Case 2: The anesthesia and analgesia for 74-year-old female patient was done in similar fashion. Three hours after the end of operation, the patient showed myoclonic movements on right leg for about 30 seconds. The movements occurred at 2-3 minute intervals for the subsequent 2 hours and resolved spontaneously. (Korean J Anesthesiol 2007; 52: 95~8)