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해안에 인접한 원자력발전소에 적용하기 위한 체결볼트의 TiN박막 코팅처리를 한 체결볼트의 방식특성
이수빈(Su-Been Lee),이진우(Jin-Woo Lee),박수정(Soo-Jeong Park),김윤해(Yun-Hae Kim) 한국해양공학회 2016 韓國海洋工學會誌 Vol.30 No.5
Recently, the lifetime extension of nuclear power plants has been considered. Thus, it is necessary to consider facility safety management and economic management. However, when the bolts in nuclear power plants are replaced and the turbines of nuclear power plant are disassembled, numerous problems are found in relation to stuck bolts in clamping parts. In order to solve these problems, a hybrid vacuum chamber was first designed and manufactured. It can perform arc ion plating and sputtering, which were used to deposit Ti/TiN on an A913 B7 bolt. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses were conducted to determine the composition and characteristics of the bolt, and tests were conducted to determine how long the bolt could endure under various conditions in a nuclear power plant. The SEM and XRD results clearly showed a continual and even coating layer. When this TiN-coated bolt is used in a nuclear power plant, the lifetime can be extended compared to a conventional bolt, but it is necessary to determine what additional properties are required.
영국 가구디자이너 베썬 그레이(Bethan Gray) 가구 연구 - 텍스처 표현기법과 조형을 중심으로 -
이수빈(Su Been Lee) 한국가구학회 2020 한국가구학회지 Vol.31 No.3
Bethan Gray (1977, Cardiff, Wales), the female British furniture designer, has created her own brand and produced several collections, keeping the public around the world informed of her work. She laid stress on the rise in the value of her work, which has emphasized aesthetic impression and originality in commercial production. Bethan Gray devoted herself to expressive techniques, such as sketching various ideas in collaboration with artists with artisanship, and focused on handicraft works. Inspired by the traditional cultural methods, the focus was made on formative features and expression methods from the features of works considering the organic forms of nature. Each feature was analyzed by dividing into Bethan Gray’s three collections, and the research aimed at the cases, morphological features of each work, and the design of CMF work. The purpose of this thesis is to create artistic value and aesthetics for furniture designers who can continue their work with their own philosophy and design and to contribute to the development of modern society in the future.
이수빈 ( Lee¸ Su-been ),최혜영 ( Choe¸ Hye-yeong ),조현길 ( Jo¸ Hyun-kil ),윤영조 ( Yun¸ Young-jo ),길승호 ( Kil¸ Sung-ho ) 한국환경복원기술학회 2021 한국환경복원기술학회지 Vol.24 No.4
Urban green spaces offer a variety of benefits to living things and humans. However, existing green spaces have been reduced and fragmented due to urbanization, and there is a limit to creating new large green spaces in densely developed cities. Street trees have fewer restrictions on land use, which can be a measure to secure green areas in cities. In Korea, excessive pruning is being done on some street trees for reasons such as blocking of building signboards, contact with electric wires, and restrictions on sidewalk widths. Therefore, it is necessary to quantitatively understand the relationship between the benefits provided by street trees and their structures to come up with an efficient and systematic planning and management plan for urban street trees. In this study, we quantitatively analyzed the relationship between the thermal comfort improvement by the shades of street trees and the vertical structure, planting environment, and types of street trees. To calculate the thermal comfort felt by human body, we calculated UTCI (Universal Thermal Climate Index) of each street tree. For the vertical structure of street trees, we used Terrestrial LiDAR and the point clouds of street tree’s crown was sliced vertically at 1m intervals. We conducted a multiple regression analysis on the thermal comfort improvement using the variables we obtained from fields. As a result, in the case of a street tree’s vertical structure, the lager the volume of tree’s crown located 3-4m (β=0.298, p<.05) and 6-7m (β=0.568, p<.001) above clear length, the better the cooling effect. In addition, the thermal comfort improvement was assessed to decrease as the DBH increased (β=-0.435, p<.001). In general, the crown diameter and DBH are positively correlated, with a cooling effect occurring as crown diameter increases. In this study, the opposite result was obtained due to the small number of trees measured, so additional research is needed by increasing the number of tree samples. In the case of the planting environment, the effect of improving thermal comfort was higher in the shaded area of trees planted to the south (β=-0.541, p<.001). Since unsystematic management of street trees can deteriorate the function of them, quantitative evaluations of the vertical structure of street trees are required, which can provide specific measures for planning and management of urban street trees with thermal comfort effect.
이도형(Do-Hyung Lee),길승호(Sung-Ho Kil),이수빈(Su-Been Lee) 인간식물환경학회 2021 인간식물환경학회지 Vol.24 No.4
Background and objective: The purpose of study is to analyze the three-dimensional (3D) structure by creating a 3D model for green spaces in a park using unmanned aerial vehicle (UAV) images. Methods: After producing a digital surface model (DSM) and a digital terrain model (DTM) using UAV images taken in Mureung Park in Chuncheon-si, we generated a digital tree height model (DHM). In addition, we used the mean shift algorithm to test the classification accuracy, and obtain accurate tree height and volume measures through field survey. Results: Most of the tree species planted in Mureung Park were Pinus koraiensis, followed by Pinus densiflora, and Zelkova serrata, and most of the shrubs planted were Rhododendron yedoense, followed by Buxus microphylla, and Spiraea prunifolia. The average height of trees measured at the site was 7.8 m, and the average height estimated by the model was 7.5 m, showing a difference of about 0.3 m. As a result of the t-test, there was no significant difference between height values of the field survey data and the model. The estimated green coverage and volume of the study site using the UAV were 5,019 ㎡ and 14,897 ㎥, respectively, and the green coverage and volume measured through the field survey were 6,339 ㎡ and 17,167 ㎥. It was analyzed that the green coverage showed a difference of about 21% and the volume showed a difference of about 13%. Conclusion: The UAV equipped with RTK (Real-Time Kinematic) and GNSS (Global Navigation Satellite System) modules used in this study could collect information on tree height, green coverage, and volume with relatively high accuracy within a short period of time. This could serve as an alternative to overcome the limitations of time and cost in previous field surveys using remote sensing techniques.