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최규태 ( Choi Kyu-tae ),정상욱 ( Jung Sang-wook ),안진희 ( Ahn Jin-hee ),김상효 ( Kim Sang-hyo ) 한국구조물진단유지관리공학회 2008 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.12 No.2
Recently, the application of corrugated plates is increasing due to structural advantages as the bucking strength and accordion effects. However, this structural advantages can decrease the stiffness of structural system and economical efficiency for manufacturing the corrugated panel. Therefore, in the study, the numerical analysisses are carried out to evaluate the bucking strength and prestressing effect of partially corrugated steel web.
최규태 ( Choi Kyu-tae ),안진희 ( Ahn Jin-hee ),박현민 ( Park Hyun-min ),김상효 ( Kim Sang-hyo ) 한국구조물진단유지관리공학회 2009 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.13 No.1
The use of corrugated steel plates is increasing due to advantages as the bucking strength and accordion effects. However, this advantages can decrease the stiffness of structural system and economical efficiency for manufacturing the corrugated panel. Therefore, partially corrugated steel web is proposed to overcome this problem In the study, FEM analysis are carried out to evaluate the elastic shear bucking strength of partially corrugated steel web.
최규태(Kyu Tae Choi),류연동(Yeon Dong Ryu),전석환(Suk-Hwan Jun),김유환(Yu-Hwan Kim),한진호(Jin Ho Han),김택영(Taig Young Kim) 대한기계학회 2022 大韓機械學會論文集B Vol.46 No.3
일정한 벽 온도 조건하의 관 유동 대류열전달에 대한 단순이론으로부터 TEC를 사용한 냉각식 액체질량유량 계측이론을 추론하여 제시하였으며, 수치해석을 통하여 상 · 하류 온도 계측위치 간 거리, 관외경, TEC와 관 외피 사이 접촉열저항, 주위온도 등 설계인자의 영향을 평가하고, 지수함수 형태의 수학모델을 정립하였다. 수학모델에 근거하여 최소 및 최대 유량계측 분해능에 한계가 존재함을 확인하였으며, 이러한 한계 영역을 확장하기 위한 설계지침을 제시하였다. 최소 질량유량과 최대 질량유량 계측범위 확장을 위한 설계는 서로 상반되는 경향을 갖는다. 수학모델에 직접 나타나지 않았으나, 주위온도는 입 · 출구 온도차 비의 선형적 변화를 유도하며, 계측 정확도를 위하여 이에 대한 보정이 수행되어야 한다. 본 연구의 이론은 반도체 생산공정의 액상전구체 정밀공급제어기 최적설계에 적용될 수 있다. The theory on the cooling type liquid mass flow meter using a thermoelectric cooler (TEC) was deduced from the simple theory of tube flow convective heat transfer under a constant wall temperature condition. The effects of design parameters such as the distance between up and downstream thermistors, tube outer diameter, contact thermal resistance between the TEC and the tube outer surface, and surrounding temperature were evaluated via numerical calculations, and consequently, a mathematical model in the form of an exponential function was established. Based on this model, a limit in the resolution of the minimum and maximum flow rate measurements was confirmed, and design guidelines for extending these limits were presented. Designs to widen the range of mass flow rates in maximum and minimum tend to be opposite to each other. The theory of this study is important in the optimal design of the liquid precursor supplying system in the semiconductor production process.
Corrugated rib 전단연결재의 전단저항 및 연성평가
최규태 ( Choi Kyu-tae ),안진희 ( Ahn Jin-hee ),김성현 ( Kim Sung-hyun ),박현민 ( Park Hyun-min ),김상효 ( Kim Sang-hyo ) 한국구조물진단유지관리공학회 2008 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.12 No.1
In this study corrugated rib is modified as a type of perfobond rib shear connector to compare the shear capacity. Push-out specimens were fabricated to evaluate the influences of hole-crossing bars, concrete dowel and depth of corrugated panel on the shear capacity. As the results, the failure mechanisms of Corrugated rib and perfobond rib specimens were associated with the bearing failure of the concrete slabs, while the failure of weld zone did not occur. The shear capacity of corrugated rib specimens improved as high to 207% compared to perfobond ribshear connector. The increment of the depth of corrugated panel and the change of concrete dowel effect also showed, therefore increasing the shear capacity. The corrugated rib shear connector showed characteristics of ductile behavior standing considerable amount of load after it reached its ultimate strength.