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전해액 조성에 따른 구리박막의 전기적 특성 변화에 대한 연구
송유진,서정혜,이연승,나사균,Song, Yoo-Jin,Seo, Jung-Hye,Lee, Youn-Seoung,Rha, Sa-Kyun 한국재료학회 2009 한국재료학회지 Vol.19 No.6
The electrolyte effects of the electroplating solution in Cu films grown by ElectroPlating Deposition(EPD) were investigated. The electroplated Cu films were deposited on the Cu(20 nm)/Ti (20 nm)/p-type Si(100) substrate. Potentiostatic electrodeposition was carried out using three terminal methods: 1) an Ag/AgCl reference electrode, 2) a platinum plate as a counter electrode, and 3) a seed layer as a working electrode. In this study, we changed the concentration of a plating electrolyte that was composed of $CuSO_4$, $H_2SO_4$ and HCl. The resistivity was measured with a four-point probe and the material properties were investigated by using XRD(X-ray Diffraction), an AFM(Atomic Force Microscope), a FE-SEM(Field Emission Scanning Electron Microscope) and an XPS(X-ray Photoelectron Spectroscopy). From the results, we concluded that the increase of the concentration of electrolytes led to the increase of the film density and the decrease of the electrical resistivity of the electroplated Cu film.
파이썬을 이용한 국내 병해충관리용 유기농업자재 허용물질과 공시현황 분석
진명수(Myeung-Soo Jin),김형우(Hyeung-Woo Kim),이상현(Sang-Hyeon Lee),김인모(In-Mo Kim),송유진(Yoo-Jin Song),안수정(Soo-Jeong Ahn),김민정(Min-Jeong Kim),심창기(Chang-Ki Shim),최성환(Sung-Hwan Choi) 한국농약과학회 2024 농약과학회지 Vol.28 No.1
Organic agricultural materials are products made from substances permitted for use in the production, manufacturing, processing, or handling of organic agricultural products. Disclosure of information including the names, main ingredient details, quantities, and methods for usage of organic agricultural materials is regulated by the National Agricultural Products Quality Management Services (NAQS). In this study, the ingredients and characteristics of permitted substances were analyzed for acquisition of data on the disclosure status of organic agricultural materials with the purpose of sharing information on product development. As of 2022, using Pythons PyAutoGUI and Pandas libraries, the ingredient names of disclosed items were collected and processed and an analysis was performed using Excel’s pivot tables. There were 1,931 disclosed items of organic agricultural materials, including 955 items (49.5%) for soil improvement and crop growth, 311 items (16.1%) for insect control, 245 items (12.7%) for crop growth, 223 items (11.5%) for disease control, and 162 items (8.4%) for disease and insect control, and 35 items (1.8%) for soil improvement items. When categorizing the raw material names of items based on permitted substances for control of disease and insects, sodium silicate accounted for 59 items (19.4%) for disease control, natural plant preparations comprised 128 items (25.6%) for insect control, and both animal and plant-based oils as well as natural plant preparations each comprised 66 items (20.4%) for control of disease and insects, which were the most prevalent. The ingredient names of all items used in control of disease and insects were mainly represented by Sophora Flavescens extract and sulfur, each with 73 items (6.5%), and sodium silicate with 65 items (5.8%). However, analyzing the names of all ingredients can be challenging due to potential differences in disclosure of identical substances, making determination of accurate figures difficult. Improved methods for collection and processing of data for these disclosure documents may contribute to the collection of information on all disclosed organic agricultural materials. Collection of data on all organic agricultural materials could contribute to the standardization of names and the establishment of an accurate system of classification.
軸對稱 프리스트레스드 콘크리트 탱크와 彈性地盤과의 相互作用에 관한 硏究
宋裕振 동아대학교 공과대학 부설 한국자원개발연구소 1985 硏究報告 Vol.9 No.1
The axisymmetric prestressed concrete tanks on eleastic foundations are widely used in civil engineering structures because of their superior structural performance, economy and attractive appearance. In this paper it is attempted to get the practical solution for the axisymmetric prestressed concrete tanks on the elastic foundation by the finite element method. Winkler's model is used for the elastic foundation. Two types of elements, such as the cylinder element and the circular plate element having circular hole, are proposed for the elastic foundation to evaluate the soil structure interactions. Interpolation techniques are used to estimate the unknown equivalent nodal reactions from foundation to base plate by using parabolic shape functions. A finite element program has been completely developed and the results obtained by it are compared with analytical solution for the fixed cylinderical tank under hydraulic internal pressure. The results are in good agreement with each other. With the program developed by author, some examples are analyized and various structural characteristics for the types of structures are discussed.