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Hee‑Seon Bang,Seong Min Hong,Atanu Das,Han‑Sur Bang 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.5
Hybrid friction stir welding, adopting an external pre-heat source in front of the friction stir welding (FSW) tool, is knownas a way of overcoming the disadvantages of conventional FSW; lack of plastic flow and excessive tool wear. In joining ofaluminum alloy to steel, presence of intermetallics (IMC) is essential, but its excessive growth can degrade the joint qualityby its brittleness. In this study, joining of 2.5 mm thick Al5052 aluminum alloy and 1.4 mm thick DP590 high strength steelhas been carried out by FSW and TIG assisted hybrid friction stir welding (HFSW) through experiments and numericalanalysis. Joints characteristics of two process was compared to optimize the process parameters. A 3-D model was developedto estimate the thermal elastic–plastic characteristics of the joints. It was confirmed that the joint efficiency of HFSW jointshas been improved to 84% than that of FSW (74%). 2.74 μm thickness of IMC layer was formed in HFSW joints and satisfiedthe permissible thickness (under 10 μm). The maximum residual stress (σzz) in welding direction was slightly higherat the HFSW joints than at the FSW joints. The overall results from experiment and simulation confirmed that HFSW is aneffective way of joining Al5052 to DP590.
핸드볼 페널티드로우 시 숙련자와 비숙련자 간의 시각적 변이 비교 분석
한재희,박영민,신선미,이준희,심윤식 순천향대학교 기초과학연구소 2022 순천향자연과학연구 논문집 Vol.28 No.1,2
The purpose of this study is to analyze the visual variation of skilled and unskilled people, and to obtain data necessary for skill improvement of effective handball penalty throw. An eye tracker was used to collect eye movements, concentration points, directions, and paths during penalty throws. The results are as follows: 1) For skilled players, the place where they threw and the place where their eyes were focused matched. 2) There is no difference in the presence or absence of eye contact with the goalkeeper.
토당귀 종자의 형태적 특성과 발아와 입모율에 대한 저장방법,생장조절제 및 프라이밍 처리 효과
안희정,안복주,·김도현,·안영섭,·김영국,박춘근,이상원,·박충범·차선우,·송범헌, 忠北大學校 農業科學硏究所 2015 農業科學硏究 Vol.31 No.1
This study was conducted to have basic and applied informations to establish the cultivation method and to improve the cultivation techniques of Angelica gigas Nakai through investigating the rates of germination and seedling establishment with treatment of plant growth regulator and seed priming. The germination rates of round shape seed were about 0.3~12% higher than those of parallel shape. The germination rates with different storage durations were increased at the level of 25oC and 4oC with the storage days, while they were clearly higher at -20oC compared to those at 4oC and 25oC without the storage durations. With the results of germination rates with treating of plant growth regulator and seed priming, their rates with the round shape seeds were comparatively higher about 6% than those with parallel shape seed and they were increased with increasing of the storage durations. The germination rates were generally appeared higher with GA3 than did those with seed priming. The highest germination rate was appeared at 50 ppm GA3 of plant growth regulator and at -0.5 MPa PEG6000 of seed priming. The germination rates?ㅤ ?ㅤ of Angelica gigas were different with different temperature, storage durations and the treatments of plant growth regulator and seed priming. These results could be used according to different cultivating conditions.
김선미,양규호,김선희 大韓小兒齒科學會 1996 大韓小兒齒科學會誌 Vol.23 No.1
The occlusal patterns and profiles of the primary dentition were studied by oral examination from 3 to 6 year-old children (100 boys, 100 girls) in Kwangju city. The results were as follows : 1. In sagittal primary second molar relationship, mesial step(48%) and flush terminal plane relationship (47.5%) were prevalent. 2. In profile view, straight profile (57%) was prevalent. 3. In comparison of relationship between primary second molar relationship and profile, Class 1 pattern-straight profile (31 boys, 32 girls) was prevalent.
미셀 용액에서 Ammonium Pyrrolidinedithiocarbamate를 이용한 Ni(Ⅱ)의 정량
최희선 수원대학교 자연과학연구소 1998 자연과학논문집 Vol.1 No.-
In has been studied on the determination of Ni(Ⅱ) with APDC(ammonium pyrrolidinedithiocarbamate) as a chelating agent in Tween80 micellar medium. UV-Vis spectrum of Ni(PDC)₂complex in Tween 80 medium had more appearance and sensitivity than that in chloroform solvent. Ni(PDC)₂complex was very stable at pH 7.0 and up to 100 minutes, and could be quantitatively chelated if APDC was added to the sample solution more 10 times than the amount of Ni(Ⅱ). The optimum concentration of Tween80 was 0.1%. And, the calibration curve of Ni(PDC)₂complex with good linearity(R²= 0.9955) was obtained in 0.1% Tween80 medium. Detection limit and determination limit of this proposed technique were 0.0855 ㎍/mL and 0.2849㎍/mL, respectively.
영도지역의 노인복지서비스에 관한 연구 : 종합사회복지관을 중심으로
김선희 고신대학교 영도발전연구소 2000 영도연구 Vol.2 No.-
The purpose of this study was to find out the conditions and program of community welfare services for the elderly of Youngdo-Gu. A structured questionnaire was used and data were obtained through 5 samples of social workers of social welfare center in Youngdo. The data were analyzed by frequency, percent. From the results, it was 7.11% who were sixty five years and older, Youngdo area entered aging society. 49.4% of the elderly who were lived in Dongsam-dong and Cheonghak-dong. Elderly of another area(dong) in Youngdo-Gu were little use-ratio of community welfare services for the elderly. For the enhancement of Youngdo community, there is need to enlargement of welfare service for them. And 5 social welfare centers provided various welfare services for the elderly according to their conditions. There is need to provide continuous leisure programs besides basic-need programs for elderly in home.
이희춘,지선수 尙志大學校 生産技術硏究所 1998 生産技術論叢 Vol.- No.4
The purpose of this research is to serve as a base for promoting the growth of an information and communication city by orienting to develop Wonju an information and communication city and to present its prospective models. According to the project, Wonju can be a city of crucially strategical resources by the regional strong economic activities in Wonju areas, which will be able to not only enhance the better life but also lead more job opportunities for the people. Also the plan can make Wonju a clean industry city without pollution problems. Therefore the increase of tax revenues is expected by the population influx to this areas. Information and communicative industry by introducing software industry would help Wonju area be the post of strategic importance with bringing middle and less leveled technology of S/W industry and by proceeding with the forward the scheme of software supporting center and S/W founding and upbring center to Wonju.