http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
김기철,곽철승,Kim, Gee-Cheol,Kwak, Chul-Seung 한국공간구조학회 2006 한국공간구조학회지 Vol.6 No.3
수동동조질량감쇠기의 진동제어 효과는 질량감쇠기와 구조물과의 동조로 인하여 나타나고 있다. 그러나 바닥판 구조물의 질량과 강성의 변화로 인하여 실제 구조물에 있어서 비동조 현상이 일어나기도 한다. 이러한 상황에서는 수동동조질량감쇠기의 성능이 비효율적이며 경우에 따라서는 구조물의 진동을 증가시키기도 한다. 본 논문에서는 기계나 사람에 의한 바닥판 구조물의 진동을 줄이기 위하여 자기유체감쇠기의 적용성을 알아보고자 한다. 준 능동제어와 groundhook 제어 알고리즘을 적용하여 준능동감쇠기의 성능과 수동질량감쇠기의 성능을 비교 분석하였다. 또한 비동조 상황에서의 준능동감쇠가와 수동질량감쇠기의 견인성을 비교 분석하여 다음과 같은 결론을 얻었다. 자기유체감쇠기는 동조상황에서 우수한 제어 성능을 가지고 있으며 비동조 상황에서도 우수한 견인성을 보여주고 있다. A conventional passive TMD is only effective when it is tuned properly. In many practical applications, inevitable off-tuning of a TMD occurs because the mass in a building floor could change by moving furnishings, people gathering, etc. when TMDs are offtuned, TMDs their effectiveness is sharply reduced. Moreover, the off-tuned nTMDs can excessively amplify the vibration levels of the primary structures. This paper discusses the application of a new class of MR damper, for the reduction of floor vibrations due to machine and human movements. The STMD introduced uses a MR damper called to semi-active damper to achieve reduction in the floor vibration. Here, the STMD and the groundhook algorithm are applied to a single degree of freedom system representative of building floors. The performance or the STMD is compared to that or the equivalent passive TMD. In addition, the effects of off-tuning due to variations in the mass of the floor system. Comparison of the results demonstrates the efficiency and robustness or STMD with respect to equivalent TMD.
김기철,곽철승,Kim, Gee-Cheol,Kwak, Chul-Seung 한국공간구조학회 2007 한국공간구조학회지 Vol.7 No.5
바닥판 구조물의 진동제어를 위한 제어시스템으로 제어력의 조절에 따라서 수동, 능동, 준능동 제어 시스템이 구분할 수 있다. 본 논문에서는 MR감쇠기와 수동 TMD를 조합한 준능동 TMD(MR-TMD)의 제어기법에 따른 바닥판 구조물의 진동제어성능을 알아보았다 MR-TMD의 감쇠기 모형화 방법에 따라서 Groundhook 모델과 Skyhook 모델이 있으며 주구조물인 바닥판 구조물의 진동제어에 있어서는 Skyhook 모델보다 Groundhook 모델보다 효과적인 것을 볼 수 있다. 그러나 TMD변위가 제한적인 경우에 MR-TMD의 감쇠기를 Skyhook 모델로 모형화하여 진동을 제어할 필요가 있다 그리고 Hybrid 제어기법을 적용할 경우에 바닥판 구조물과 TMD를 동시에 최적으로 제어할 수 있으므로 우수한 제어성능을 보이고 있다. Passive, active and semi-active control system are classified in floor vibration control system by providing control force. This paper discusses the application of a new class of semi-active TMD(MR-TMD), for the reduction or floor vibrations due to machine and human movements. This MR-TMD consists of passive TMD and MR damper. Here, displacement-based control methods are used to assess the performance of this STMD(MR-TMD). And, skyhook and the groundhook algorithm are applied to a single degree of freedom system representative of building floors. If the allowed operation space of tuned mass is limited in MR-TMD system, skyhook algorithm is more efficient than groundhook algorithm for floor vibration control. Hybrid control method demonstrates the efficiency of MR-TMD with respect to another methods.
김태형,김상철,문세광,허경억,곽철승,전상일,도일환 대한내과학회 1987 대한내과학회지 Vol.33 No.1
Solitary plasmacytoma of bone is an unusual solitary tumor of plasma cell origin. The clinical difference between tis tumor and multiple myeloma remain unclear. We experienced a case of solitary plasmacytoma of thoracic spine. So we have reported the case with the review of previous literatures.
배성조,문세광,도사금,임성이,곽철승,장세윤 대한내과학회 1986 대한내과학회지 Vol.31 No.3
This is a case of leukemia which was negative for peroxidase and PAS stain. However the perpheral blood smear showed l%. of hand-mirror ce1ls, bone marrow smear revealed markedly increased blast form leukocytes with the features of hand-mirror, teardrop and tadpole appearances in 50% of them. Based on the above findings, hand-mirror cell leukemia could be diagnosed.
김무환(Kim Mu-Hwan),홍성일(Hong Sung-Il),곽철승(Kwak Chul-Sung),조강표(Cho Kang-Pyo) 대한건축학회 2009 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.29 No.1(구조계)
Canopies are attached to buildings usually as a cantilever type excepting long one supported by columms . The upper and lower surfaces of a canopy can be largely affected by winds. For this reason, wind load as well as dead loads should be considered in the design of canopies. In the previous study, wind pressure distribution on the canopy were investigated according to the installation heights and inclinations of a canopy. In this study, vertical and moment reactions at the support of a canopy are approximately computed by integrating wind pressures according to its installation heights and inclinations, and the reactions are compared by the installation heights and inclinations. In Korea, design wind loads for canopies are not prepared and are being approximated by structural engineers in practice. Accordingly, the method for estimating wind loads to be employed in the design of canopies is required.