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RISS 인기검색어
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- 저자 : 강신우 ( Kang Sin Woo ) (검색결과 9 건)
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FFF 방식 적층성형의 층 성형시간이 형상 오차에 주는 영향
강신우 ( Kang Sin Woo ),김건휘 ( Geon Hwee Kim ) 충북대학교 산업과학기술연구소 2022 산업과학기술연구 논문집 Vol.36 No.2
Additive manufacturing technology is widely being used for the prototype of parts or products by ease and low cost compared to casting and subtractive manufacturing. Especially FFF (Fused Filament Fabrication) method is mainly used not only for industrial prototype but also emerging in commercial products for comparably low costs and difficulties in post processing. But dimensional accuracy of FFF method is lower than other additive manufacturing methods since laminating of layer is processed at high temperature. To increase the dimensional accuracy of FFF method, studies were carried out about factors causing dimensional errors on parts (layer height, infill percentage, heating bed temperature etc.). In this study, the dimensional accuracy of parts made by additive manufacturing with the FFF method is investigated. The main goal of this study is to check whether the varying printing time of each layer affects the dimensional accuracy of parts when multiple parts are printed at once. Models having identical planar shapes but various heights are printed and investigated. The ABS was used as the filament material for the additive manufacturing.
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밤나무 시비시험 (Ⅱ) - 일조량부족과 (日照量不足) MgO 의 시비효과 -
정인구,강신우,이명선 ( In Koo Chung,Sin Woo Kang,Meong Sun Lee ) 한국산림과학회 1982 한국산림과학회지 Vol.58 No.1
During the two-years(1979 to 1980) fertilization trial on 4-year-old chestnut tree plantations. total insolation was diminished in 1980 because of unseasonable weather. In every fertilization treatment plot, especially in the NPK-fertilized plot with mannesium, growth of trees and yield of chestnuts have been increased significantly. The results obtained are as follows: 1) The growth in the NPK-fertilized plot with boron and magnesium was 20 percent higher than in plots fertilized with NPK alone. 2) Although there was some frost damage to trees on November 14, 1979, the 1979 weather was otherwise normal and daily insolation averaged 7 hours from June through september, The 1979 fertilization indices for chesnut yield were 167 for NPK with boron and 207 for NPK with magnesium, as compared with the base index of 100 for NPK alone. 3) In 1980, the second year of the fertilization trial, unseasonable weather decreased the average daily insolation from June through September to 3.8 hours. Under such conditions, the fertilization indices for chestnut yield were 620 for NPK with boron and 741 for NPK with magnesium, and Boron, as compared to the base index of 100 for NPK alone; i.e. the yields of plots treated with NPK and magnesium were 21 percent higher than for plots with NPK and boron and 7 times the yields for plots with NPK alone, But in the trial plot of NPK, yield of chestnut in 1980 decreased compared with 1979, 4) All test plots had natural magnesium levels lower than 0.8me/100gr., and the treatments with NPK and magnesium would have been less apparent on soils with higher magnesium level. The spectacular effects of treatment with NPK and magnesium during periods of low insolation may result from increased chlorophyll production and corresponding increases in active carbon assimilation, which should play an important role in carbohydrate formation.
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의사의 타분야 진출에 대한 의과대학 학생과 교수의 인식
윤소정(Yune So-Jung),강신우(Kang Sin-Woo),구해범(Koo Hae-Beom),김민주(Kim Min-Ju),김지후(Kim Ji-Hu),박한결(Park Han-Gyeol) 부산대학교 교육발전연구소 2019 교육혁신연구 Vol.29 No.3
연구목적: 의료인들의 타분야 진출에 대한 사회적 요구가 점차 증가됨에 따라 의사면허 취득자들이 의료계뿐만 아니라 다양한 분야로 진출하는 것이 더 용이해지고 있다. 뿐만 아니라 의사 집단 내부의 개인적 동기 또한 의사의 타분야 진출에 중요한 영향을 미치고 있다. 그러나 의과대학생들의 타분야 진출을 위한 진로교육은 미진한 상태이다. 따라서 본 연구에서는 의사가 임상 의사로서의 직업이 아닌 다른 분야에 진출하는 것에 대한 의과대학 교수, 학생들의 인식 차이를 조사하고, 의과대학 학생들이 희망하는 타분야 진출을 위한 진로교육방법은 무엇인지를 알아보고자 한다. 연구방법: 의과대학 학생들의 타분야 진출에 대한 인식 조사는 부산 소재 한 개 대학의 교수 45명과 부산과 경기 소재의 2개 의과대학 학생들 694명을 대상으로 설문 조사를 통해 진행하였다. 학생의 경우에는 의예과와 의학과 저학년, 그리고 의학과 고학년의 3개 집단으로 나누어 분석하였다. 설문 조사 결과 분석을 위하여 빈도분석, 교차분석을 실시하였다. 연구결과: 현재 국내의 의사 수에 대한 의과대학 교수와 학년별 학생의 인식에는 의미 있는 차이가 나타났다. 그리고 의사의 타분야 진출의 필요성에 대한 인식과 의사가 진출하기에 가장 장래가 유망해 보이는 직종 및 타분야 진출시 고려사항에 대해서도 소속에 따른 의미 있는 차이가 나타났다. 학생들은 의사의 타분야 진출을 위해서는 진로교육이 필요하다고 응답하였다. 논의 및 결론: 본 연구 결과는 의과대학생들의 다양한 진로탐색과 진로교육의 방향 설정을 위한 기초 자료를 제공하여 의사 집단 내부의 요구와 사회적 요구를 충족시킬 수 있는데 도움이 될 수 있을 것이라 생각한다. 또한 시대적 흐름에 맞는 다양한 분야와의 전문성 융합으로 의사의 경쟁력을 증대시키는데 도움을 줄 수 있을 것이다. Purpose: There is an increasing need for social and personal needs for physicians to have a job in various fields other than clinical jobs. Gradually the importance of career education in medical schools is increasing. The goal of this study is to compare the difference of perceptions of medical school professors and students about the physicians’ non-clinical jobs. And we surveyed what kind of career education method students want. Method: We surveyed questionnaires to see how professors and medical students of medical school think about physicians’ non-clinical jobs. In addition, we examined what programs should be offered in medical education in order to develop career awareness in doctors’ non-clinical jobs. The final sample consisted of 45 professor participants from one medical school and 694 student participants from two medical schools. Frequency analysis and crossover analysis were conducted to analyze the survey results. Results: The results showed that there were differences between perception of students and professors in sufficiency of the number of physicians in Korea, the need of physicians’ non-clinical job, the desired jobs other than as a clinical job, and the promising occupations in doctors’ non-clinical jobs. There was no difference in perception that both professors and students of medical school needed career education that allowed medical students to have non-clinical jobs. Conclusion: The results of this study are expected to provide meaningful information to medical students who want to enter into various fields and provide basic data for improvement of career education courses in medical school.
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허승오,한경화,전상호,장용선,강신우,정선옥,김학진,이경환,Hur, Seung-Oh,Han, Kyeong-Hwa,Jeon, Sang-Ho,Jang, Yong-Sun,Kang, Sin-Woo,Chung, Sun-Ok,Kim, Hak-Jin,Lee, Kyeong-Hwan Institute of Agricultural Science 2011 Korean Journal of Agricultural Science Vol.38 No.4
Protected crop production has been popular in Korea as well as in other countries. Intensive and continuous monitoring and control of the environment, which is labor- and time-consuming, is critical for stable crop productivity and profitability, otherwise damage could be happened due to unfavorable ambient and soil conditions. In the study, potential utilization of smartphone and remote access application in protected crop production environment was investigated. Tested available remote access applications provided functions of mouse click (left and right buttons), zooming in and out, and screen size and color resolution control. Wi-Fi data communication speeds were affected by signal intensity and user place. Data speeds at high (> -55 dBm), medium (-70~-56 dBm), and low (< -71 dBm) signal intensity levels were statistically different (${\alpha}=0.05$). Means of data communication speed were 6.642, 4.923, and 2.906 Mbps at hot spot, home, and office, respectively, and the differences were significant at a 0.05 level. Smart phone and remote access application were applied successfully to remote monitoring (inside temperature and humidity, and outside precipitation, temperature, and humidity) and control (window and light on/off) of green house environment. Response times for monitoring and control were less than 1 s at all places for high signal intensity (> -55 dBm), but they were increased to 1 ~ 10 s at home and office and to 10 ~ 30 s at hot spot for low signal intensity (< -71 dBm) for Wi-Fi. Results of the study would provide useful information for farmers to apply these techniques for their crop production.
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허승오(Seung-Oh Hur),한경화(Kyeong-Hwa Han),전상호(Sang-Ho Jeon),장용선(Yong-Sun Jang),강신우(Sin-Woo Kang),정선옥(Sun-Ok Chung),김학진(Hak-Jin Kim),이경환(Kyeong-Hwan Lee) 충남대학교 농업과학연구소 2011 농업과학연구 Vol.38 No.4
Protected crop production has been popular in Korea as well as in other countries. Intensive and continuous monitoring and control of the environment, which is labor- and time-consuming, is critical for stable crop productivity and profitability, otherwise damage could be happened due to unfavorable ambient and soil conditions. In the study, potential utilization of smartphone and remote access application in protected crop production environment was investigated. Tested available remote access applications provided functions of mouse click (left and right buttons), zooming in and out, and screen size and color resolution control. Wi-Fi data communication speeds were affected by signal intensity and user place. Data speeds at high (> -55 dBm), medium (-70~-56 dBm), and low (< -71 dBm) signal intensity levels were statistically different (α=0.05). Means of data communication speed were 6.642, 4.923, and 2.906 Mbps at hot spot, home, and office, respectively, and the differences were significant at a 0.05 level. Smart phone and remote access application were applied successfully to remote monitoring (inside temperature and humidity, and outside precipitation, temperature, and humidity) and control (window and light on/off) of green house environment. Response times for monitoring and control were less than 1 s at all places for high signal intensity (> -55 dBm), but they were increased to 1 ~ 10 s at home and office and to 10 ~ 30 s at hot spot for low signal intensity (< -71 dBm) for Wi-Fi. Results of the study would provide useful information for farmers to apply these techniques for their crop production.
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강신우,김영삼,정영철 대한금속재료학회(대한금속학회) 1993 대한금속·재료학회지 Vol.31 No.9
This paper describes the results on the fabrication of the iron-nitriding powders using the pickling acid of steel. The fabrication of iron-nitriding powders is easily proceeded when the ultra fine (75 angstrom) magnetite precipitated at pH 12, Fe^(2+)/Fe^(3+)=0.5 mol ratio in the pickling acid are reacted with the mixing gases of H₂ and NH₃. 1) Fe₄N powder was formed at 500℃ with the mixing ratio H₂/NH₃ of 1.0/0.2 to 1.0/0.4. Mixed Fe₄N and Fe₃N powders were obtained at 500℃ with the mixing ratio H₂/NH₃ of 1.0/0.6 to 1.0/0.8. 2) Iron-nitriding powders were fine sizes less than 0.3㎛ and nodular shape. 3) Maximum saturation magnetization among the iron-nitriding powder under this experimental is 178emu/g when Fe₄N formed at 590℃. The value of saturation magnetization is equivalent to 96% of theoretical Fe₄N.
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