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동적모드분해를 이용한 콘크리트 건물의 풍하중 진동 특성 연구
이한솔(Lee, Han Sol),강현구(Kang, Thomas H.-K.) 한국콘크리트학회 2021 한국콘크리트학회 학술대회 논문집 Vol.33 No.2
본 연구에서는 고층 콘크리트 건물에 작용하는 풍하중의 진동 특성을 파악하기 위해 풍압 데이터에 대한 동적모드분해를 수행하였다. 풍동실험과 전산유체해석을 통해 얻어낸 풍압 데이터가 비교되었으며, 각각의 데이터에 대한 진동수별 풍압의 진동 형상을 확인하였다. In this study, dynamic mode decomposition on the wind pressure data was used to understand the behavior of fluctuating wind load on the high-rise concrete building. Wind pressure data obtained from wind tunnel test and computational simulation was compared, and vibration shape by frequency for each data was verified.
김한솔(Han-Sol Kim),이경준(Kyung-Jun Lee),정동연(Dong-Yean Jung),이연형(Yeon-Hyeong Lee),김갑순(Gab-Soon Kim) 제어로봇시스템학회 2016 제어·로봇·시스템학회 논문지 Vol.22 No.12
This paper describes the design of a cellphone curved glass measuring device using by camera. The measuring device was composed of two camera, two backlight system, a body and so on, and the program was made for a camera calibration and noise removal, and also the program was made for height measurement of a cellphone curved glass using by subpixel algorism. And then a new technique for measuring the height of the cell phone curved glass was proposed. The characteristics test of height measurement of gage blocks and cell phone curved glasses was carried out, the error of the height measurement of gage block is less than ±0.005 and the error of the height measurement of the cell phone curved glasses is less than ±0.005. Thus it thought that the designed cellphone curved glass measuring device and the new technique for measuring the height was used to measure the height of the cellphone curved glass.
김한솔(Hansol Kim),이학용(Hak Yong Lee),박찬(Chan Park),이재열(Jaeyeol Lee),임동열(Dong Yeal Lim),유정훈(Jeonghoon Yoo),현명욱(Myung Wook Hyun) 대한기계학회 2014 大韓機械學會論文集A Vol.38 No.10
중이온 입자가속기는 중이온을 radio frequency (RF) 주파수로 가속하는 장치이다. RF 공동부에 인가된 전기장은 입력된 RF 파에 의해 전자기파의 위상에 맞춰 중이온을 연속적으로 가속한다. 이를 위해서는 안정적으로 RF 파를 공동부 내부에 전달할 수 있는 커플러의 형상설계가 요구된다. 중이온 가속기에서의 RF 커플러는 입력부와 RF 주파수의 파를 방출하는 커플러 양 끝단 간의 온도차이가 매우 크다. 이 온도차를 극복하기 위해선 초저온(약 0K)부터 상온 간(약 300K)의 열 변형을 고려한 해석 및 설계기술이 필요하다. 본 연구는 RF 커플러의 구조에 따른 출력 전기장의 세기와 온도 분포, 열 손실과 열변형을 고려한 내구도 분석을 통해 성능 향상을 위한 방안들을 도출하는 것을 목적으로 하였다. A heavy ion accelerator is a device that accelerates heavy ions in the radio frequency (RF) range. The electric field that flows into the RF cavity continuously accelerates heavy ions in accordance with the phase of the input electromagnetic wave. For the purpose, it is necessary to design a coupler shape that can stably transfer the RF wave into the cavity. The RF coupler in a heavy ion accelerator has a large temperature difference between the input port and output port, which radiates the RF waves. It is necessary to consider the heat deflection on the RF coupler that occurs as a result of the rapid temperature gradient from an ultra-low temperature about 0 K to a room temperature about 300 K. The purpose of this study was to improve the system performance through an analysis of the intensity of the output electric field and temperature distribution considering various shapes of the RF coupler, along with an analysis of the durability considering the heat deflection and heat loss.
SPA 브랜드 제품의 소재에 대한 만족도와 불만족 요인
김한솔(Han sol Kim),윤다혜(Da hye Yoon),이민지(Min ji Lee),이윤정(Youn jeong Lee),황지현(Ju hyun Whang),최종명(Jong myoung Choi) 충북대학교 생활과학연구소 2015 생활과학연구논총 Vol.19 No.1
This study was carried out to help quality management of fabrics of fashion products that are sold by SPA brand. A survey using questionnaire was conducted on 339 university students in the Cheongju area, Korea. The questionnaire was composed of questions about the satisfaction of information on fashion fabrics of SPA brand provided online and offline and the dissatisfaction of fashion fabrics that the college students had worn. Recently purchased SPA brands were C brand followed by G brand and E brand. Subjects mostly purchased single items, such as T-shirts, shirts (blouses), and jackets. Subjects answered that they were buying SPA brand products because it is convenient to use stores, easy to coordinate clothes, and inexpensive. The reason why they are buying products of SPA brand showed significant difference from brand to brand. Satisfaction of fabrics of SPA brand products and fabric information was average, but it varied from brand to brand. In terms of fabric information provided on SPA brand online, subjects were satisfied with A brand and C brand, but they were not satisfied with other brand's fabric information provided. They were especially discontented that fabric information was not visible enough but hidden so they could not find it easily. Dissatisfaction factors of SPA brand products were fabric deformation caused by repeated wearing and washing, pilling, alteration of fabric hand, etc. In addition, subjects were dissatisfied with sewing quality, e.g. seams coming apart.