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집중하중을 받는 비합성.합성 생태아치구조물의 성능평가를 위한 수치해석 및 모형실험 연구
김용희,박종섭,이영호,오민수,Kim, Yong-Hee,Park, Jong-Sup,Lee, Young-Ho,Oh, Min-Su 한국강구조학회 2010 韓國鋼構造學會 論文集 Vol.22 No.2
본 논문은 I형 강재와 프리캐스트 콘크리트 바닥판으로 구성된 비합성 합성아치 생태교량에 대한 해석 및 실험 연구이다. 범용유한 요소해석 프로그램 ABAQUS(2007)를 사용하여 단위거더, 단위합성거더, 3거더 아치, 3거더 합성아치 등 4종류의 해석모델이 검토되었으며, 해석 결과를 토대로 모델별 거동특성을 분석하고, 3거더 합성아치 모형실험체에 설치될 응력 및 변형률 게이지 위치를 결정하였다. 본 연구의 정적파괴 하중실험에 사용된 실험체는 3개의 I형강 거더와 14개의 PC패널로 구성되어 있다. 모형실험체 정적파괴실험결과로부터 강거더 하부플랜지가 항복응력에 도달하는 시기의 재하하중은 유한요소해석을 통해 얻어진 정적하중과 17%정도의 차이를 나타내고 있으며, 실험체 파괴하중은 1,961kN으로 AASHTO LRFD 교량설계기준 (2007)의 단면 소성모멘트를 이용한 작용가능하중은 1,380kN으로 본 실험체는 충분한 내하력을 나타내고 있다. 해석결과와 실험결과를 토대로 새로운 형식의 비합성 합성아치 교량의 안전성과 강도가 충분히 발휘됨을 확인할 수 있었다. In this study, noncomposite and composite eco-arch structures with I-beams and precast concrete(PC) decks were investigated. Four finite-element models(a steel-girder model, a steel-girder-and-several-PC-panels model, a three-steel-girder model, and a three-steel-girder-and-several-PC-panels model) using a general finite-element program, ABAQUS, were reviewed to predict the strength of the noncomposite and composite arch structures. Based on the results of the finite- element analysis, the behaviors of the four models were investigated, and deflection and strain gauges for the experimental specimen consisting of three steel girders and several PC panels were set up to obtain the ultimate strength. The ultimate strength of the specimen was estimated to be 1,961kN. The ultimate strength was much larger than the 1,380-kN load calculated using AASHTO LRFD Bridge Design Specifications(2007). The noncomposite and composite arch bridges were found to have enough strength for safety.
심장이식 환자에서 Cyclosporine에 의한 중추신경독성 -1례 보고-
김용희,송현,송명근,Kim, Young-Hee,Song, Hyun,Song, Meong-Gun 대한흉부심장혈관외과학회 1997 Journal of Chest Surgery (J Chest Surg) Vol.30 No.11
승모판막 폐쇄부전증으로 승모판막 치환술을 받은 45세 남자가 확장성 심근증으로 심장이식수술을 받았다. 환자는 수술전 면역억제를 위하여 cyclosporine 400 mg, Immuran 250 mg과 Solumedrol 500 mg을 투약하였 다 술후 cyclosporine을 2 mg/kg/day로 정주했는데 술후 8시간이 지나도 혼수상태가 지속되어 cyclosporine을 1 mg/kg/day로 감량하였다. 당시 혈장내 cyclosporine농도는 345$\mu\textrm{g}$/L, 크레아티닌 수치는 1.8 mg/dl였으며 마그 네슘 수치는 정상수준이 였다. 환자의 의식은 술후 31시간째 완전히 회복되었으나 술후 36시간경부터 전신근 력약화, 초조감, 환청 및 환각을 호소하였다. 신경증상들은 술후 4일째 정상으로 회복되었으며, 환자는 술후 28일째 퇴원하였고 12개월째 후유증은 보이지 않고 있다. A 45-year-old man underwent heart transplantation due to dilated cardiomyopathy. Cyclosporine, 2 mg/kg per day, was intravenously givell postoperatively. As central neurotoxicity signs that were included pin-point pupil, no light reflex, coma, were presented at 8 postoperative hours, cyclosporine was decreased to 1 mg/kg er day. At that time the cyclosporine level was 345 $\mu\textrm{g}$/L, the serum creatinine level was 1.8mg/dl and the serum magnesium level was within normal limit. He awaked at 31 postoperative hours and all sign of cyclosporine-induced central neurotoxicity was resolved after postoperative days. He was discharged without sequale at postoperative day 28.
김용희 ( Kim Young-hee ),이갑중 ( Lee Kab-jung ),문태경 ( Moon Tae-kyung ) 한국구조물진단유지관리공학회 1997 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.1 No.1
In steel-concrete composite Decks, shear connectors play the most important role in developing large bending rigidity according to a theory for composite action. However, no reasonable design methods of studs in a deck are not clarified yet. So, This author have entered upon the study on behavior and optimum arrangement of stud shear connectors in steel-concrete composite bridge decks.
김용희(Yong Hee Kim),김영선(Young Sun Kim),전진용(Jin Yong Jeon) 한국소음진동공학회 2017 한국소음진동공학회 논문집 Vol.27 No.7
This paper investigates stage acoustics of a concert hall for ensemble performance in terms of stage support parameters. Although more than 30 years of studies about stage acoustics, only parameter physically measurable for stage acoustics is ST1(Gade,1989, STEarly). STEarly is based on the condition of anechoic chamber and only considered by solo instrumental players’ subjective evaluation which means solo singers and ensembles are not considered. So this investigation was set by the condition of ensemble on stage of a concert hall and subjective evaluation was conducted to derive a parameter for the condition of stage acoustics for ensemble. For this investigation, a concert hall with large stage area was selected. Objective measurements were carried out according to stage support evaluation. The sound field on the stage was evaluated using stage and audience acoustical parameters. According to the positions at stage, different acoustical characteristics were found. Higher STEarly and lower IACCE3 were measured near side and rear stage walls. In case of conductor/soloist vs. orchestra player, objective measurement of acoustical parameters shows that early sound fields depend on the source-to-receiver distance but late sound fields depend on the location of side and rear walls. In addition, in-situ subjective evaluation of the trio instrumentalists was carried out. Results show that ‘ensemble’ is favored by higher early reflection of sounds and sound diffusion affecting ‘blending’ of their performance.