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원대희 한국기계기술학회 2016 한국기계기술학회 학술대회논문집 Vol.2016 No.05
The purpose of this study was to produce a prototype after performing the design for the traditional flooring Hanji after coating. It performs the following test results were as follows. The prototype was commissioned to establish optimal coating conditions through. The production of high quality flooring can be produced after the year 192,000 sheets. Largely due to the coating operation to improve hand and contributed to improving the working environment.
원대희 한국기계기술학회 2022 한국기계기술학회지 Vol.24 No.3
This study described a way of developing a resin for deviceizing quantum dots. Furthermore, the following conclusions were obtained by developing light curable syrup and UV curable syrup. First, The viscosity of the mixed resin decreased as the content of the diluent increased, and the value was bewteen 4,310 and 1,473cps. Second, haze was measured by using NDH 5000, and all of the synthesized syrups were obtained a haze value of 1% or less with a transmittance of 95% or more in the visible light region. Third, the viscosity of the mixed resin decreased as the temperature increased, and at this point, the viscosity showed a value of 4,219 to 1,128cps. Lastly, As a result of measuring the viscosity of the resin before and after mixing the quantum dot nanoparticles, it appears to be little change.
원대희 한국기계기술학회 2016 한국기계기술학회 학술대회논문집 Vol.2016 No.05
The purpose of this study was produced after the design of new equipment in order to cut the stone roll prototype. The newly designed equipment is designed and manufactured to be dressed in rolls automatically through the use of a conveyor belt. The introduction of new stone cutters were expected to be achieved productivity improvements of 15% compared to conventional production methods.
양극산화와 열수처리한 순수 니오비움 금속의 생체활성 평가
원대희,최운재,이민호,배태성 대한치과기공학회 2005 대한치과기공학회지 Vol.27 No.1
This study was performed to investigate the surface properties of electrochemically oxidized pure niobium by anodic oxide and hydrothermal treatment technique. Niobium specimens of 10 10 in dimension were polished sequentially from #600, #800, #1000 emery paper. The surface pure niobium specimens were anodized in an electrolytic solution that was dissolved calcium and phosphate in water. The electrolytic voltage was set in the range of 250 V and the current density was 10 / . The specimen was hydrothermal treated in high-pressure steam at 300 for 2 hours using an autoclave. Then, specimens were immersed in the Hanks' solution with pH 7.4 at 37 for 30 days. The surface of specimen was characterized by scanning electron microscope(SEM), energy dispersive X-ray microanalysis(EDX), potentiostat/galvanostat test, and cytotoxicity test. The results obtained was summarized as follows; According to the result of measuring corrosion behavior at 0.9% NaCl, corrosion resistance was improved more specimens treated with anodic oxide than in hydrothermal treated ones. The multi-porous oxide layer on surface treated through anodic oxidation showed a structure that fine pores overlap one another, and the early precipitation of apatite was observed on the surface of hydrothermal treated samples. According to the result of EDX after 30 days deposition in Hanks solution, Ca/P was 1.69 in hydrothermal treated specimens. In MTT test, specimens treated through anodic oxidation and hydrothermal treated ones showed spectrophotometer similar to that of the control group. Thus no significant difference in cytotoxicity was observed (P>0.05).
원대희 한국융합학회 2017 한국융합학회논문지 Vol.8 No.4
이 연구에서는 3D 프린터 히팅 블록의 발열로 인해 가이드로 열이 전달되어 필라멘트가 녹는 문제점을 개선하기 위해 설계 해석과 폭발압접을 융합한 방법으로 클래드 판재를 만들었다. 클래드 판재에 대한 전단 강도 시험을 하였으며, 히팅 블록으로 가공한 다음 열 해석, 열전도도, 열화상 측정 결과 다음과 같은 결론을 얻었다. 구리와 타이타늄 클래드 판재로 만든 히팅 블록에 대하여 3D 모델링 열 해석 한 결과 필라멘트 가이드 부위의 표면온도가 히팅 블록 표면온도 보다 낮은 온도가 예측되었다. 구리와 타이타늄 클래드 판재로 만든 다음 전단 강도를 측정한 결과 평균 195.6MPa 값을 얻었다. 구리와 타이타늄 클래드 판재로 만든 히팅 블록에 대하여 열전도도를 3회 측정한 결과 평균 62.52 W/m⋅K값을 나타내었다. 구리와 타이타늄 클래드 판재로 만든 히팅 블록에 대하여 열화상 카메라로 표면 온도를 측정한 결과 최대 107.3℃ 측정되었으며, 필라멘트 가이드 부근에서는 183.2℃ 측정되었다. 기존 필라멘트의 부위의 온도 보다 89℃ 낮은 온도 분포를 보였다. In this study, the design analysis and the explosion welding were made into a clad sheet by the convergence method in order to solve the problem of heat transfer to the guide due to the heating of the 3D printer heating block. The shear strength of the clad plate material was tested and the results were analyzed by thermal analysis, thermal conductivity and thermal imaging. The following conclusions were obtained. 3D modeling of the heating block made of copper and titanium clad plate material The thermal analysis showed that the surface temperature of the filament guide area was lower than the heating block surface temperature. The average shear strength of copper and titanium clad plate material was measured and the average value of 195.6MPa was obtained. The thermal conductivity of the heating block made of copper and titanium clad plate material was measured three times and the average value was 62.52 W / m⋅K. The surface temperature of the heating block made of copper and titanium clad plate material was measured by a thermal imaging camera at a maximum of 107.3℃ and 183.2℃ at the filament guide. The temperature distribution was 89℃ lower than that of the existing filament.
Geometric Sensitivity Index for the GNSS Using Inner Products of Line of Sight Vectors
원대희,안종선,성상경,이철수,부성천,장재규,이영재 한국항공우주학회 2015 International Journal of Aeronautical and Space Sc Vol.16 No.3
Satellite selection and exclusion techniques have been applied to the global navigation satellite system (GNSS) with the aim of achieving a balance between navigational performance and computational efficiency. Conventional approaches to satellite selection based on the best dilution of precision (DOP) are excessively computational and complicated. This paper proposes a new method that applies a geometric sensitivity index of individual GNSS satellites. The sensitivity index is derived using the inner product of the line of sight (LOS) vector of each satellite. First, the LOS vector is computed, which accounts for the geometry between the satellite and user positions. Second, the inner product of each pair of LOS vectors is calculated, which indicates the proximities of the satellites to one another. The proximity can be determined according to the sensitivity of each satellite. A post-processing test was conducted to verify the reliability of the proposed method. The proposed index and the results of a conventional approach that measures the dilution of precision (DOP) were compared. The test results demonstrate that the proposed index produces results that are within 96% of those of the conventional approach and reduces the computational burden. This index can be utilized to estimate the sensitivity of individual satellites, obtaining a navigation solution. Therefore, the proposed index applies to satellite selection and exclusion as well as to the sensitivity analyses of multiple GNSS applications.