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Randomized Hough 변환을 이용한 타원형 액적의 형상 검출
추연준,강보선,Choo, Yeon-Jun,Kang, Bo-Seon 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.10
In this study, the image processing program for deducing parameters of the elliptic shape of the partially overlapped liquid droplets was developed using the randomized Hough transform and the parameter decomposition. The procedure for the shape detection consists of three steps. For the first step, the candidate centers of ellipses are determined by the geometric property of the ellipse. Next, the rest parameters are estimated by the randomized Hough transform. In the final step for the post-processing, optimally approximated parameters of ellipses are determined. The developed program was applied to the simulated overlapped ellipses, real overlapped droplets, and real spray droplets. The shape detection was very excellent unless there existed inherent problems in original images. Moreover, this method can be used as an effective separating method for the overlapped small particles.
[Hmim][PF<sub>6</sub>]를 사용한 벤질 알코올의 호기성 산화반응용 팔라듐-은 차콜 촉매 제조
추연준,유계상,Choo, Yunjun,Yoo, Kye Sang 한국공업화학회 2014 공업화학 Vol.25 No.4
Pd on charcoal particles were prepared by wet impregnation to develop commercial catalyst for aerobic benzyl alcohol oxidation. Especially, one of room temperature ionic liquids, [Hmim][$PF_6$], was used as an effective solvent in the synthesis to improve the metal dispersion of the catalysts. Among the Pd/Charcoal with various Pd concentrations, 7.5 wt% catalyst showed the higher catalytic activity and stability. Moreover, Ag was used as a promoter with various ratios in catalyst preparation. Under identical reaction conditions, the catalyst with 9 : 1 of Pd and Ag weight ratios was most active due to higher metal dispersion. 호기성 벤질 알코올 산화반응용 상용촉매 개발을 위하여 팔라듐이 담지된 차콜 입자를 제조하였다. 특히 촉매의 팔라듐 분산도를 높이기 위해서 상온 이온성액체 중 하나인 [Hmim][$PF_6$]을 기능성 용매로 사용하여 입자를 합성하였다. 다양한 농도의 팔라듐을 함침하여 제조된 입자의 반응성을 측정한 결과 7.5 wt%의 촉매가 가장 우수한 반응 활성과 안정성을 나타내었다. 또한 조촉매로서 다양한 농도의 은입자를 합침하여 촉매를 제조하였다. 동일한 반응조건에서 팔라듐과 은의 질량 비율이 9 : 1인 촉매가 높은 금속 분산도로 인하여 가장 반응성이 우수하였다.
충돌 제트에 의해 형성되는 액막의 두께 특성에 관한 연구
추연준,강보선,Choo, Yeon-Jun,Kang, Bo-Seon 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.2
In this research, a study on the characteristics of the liquid sheet formed by two impinging jets is presented. Using the interference phenomena of light, the thickness of the liquid sheet, which seems to heavily affect the size of the droplets, is measured and compared with existing theoretical modelings. Thinner liquid sheet is produced with larger impinging angle, smaller orifice diameter, and higher azimuthal angle but the jet velocity doesn't affect the thickness. More viscous liquid produces thicker liquid sheet. The theoretical modelings predict the same trend as the experiments but the thickness values are overestimated at low azimuthal angles. This difference is gradually decreased as the azimuthal angle is increased: The breakup mechanism of the droplets from the liquid sheet is visualized by a high speed camera. The crest around the edge of the liquid sheet is protruded with the accumulation of liquid at the end of protuberance, which contracts into a spherical shape and then becomes detached when the stem breaks down, producing large droplets with a few small size of satellites.
웹 기반 애니메이션 제작 어플리케이션의 개선 방법 연구
추연준(Yeon Jun Choo),석혜정(Hae Jung Suk) 한국만화애니메이션학회 2010 만화애니메이션연구 Vol.- No.21
웹 2.0 시대에 이르러 일반인들이 각 미디어 콘텐츠를 단지 향유하는 것에 그치지 않고 콘텐츠를 직접 제작하기에 이르렀으며, 이러한 양상에 힘입어 사용자 참여에 의해 제작된 콘텐츠가 가치와 영향력을 갖게 되는 시대로 접어들고 있다. 이렇게 미디어 콘텐츠 제작에 사용자의 참여가 증가하고 가치를 갖게 된 데에는 웹을 기반으로 한 어플리케이션의 활발한 개발이 큰 몫을 한다. 기존의 어플리케이션들이 숙련된 사용자들을 위한 어플리케이션이었다면, 일반인의 참여를 유도하는 웹 기반 어플리케이션들은 간편한 조작만으로도 제작을 가능하게 하여 사용자에게 새로운 즐거움을 안겨 준다. 본 연구에서는 상대적으로 타 콘텐츠 제작 어플리케이션에 비해 일반인의 제작 참여가 활성화 되지 않은 사용자 중심의 웹 기반 애니메이션의 제작 어플리케이션을 분석하여, 사용자들의 접근성을 높이고 참여를 유도하는 어플리케이션의 개선 방향을 제안하고자 한다. 다양한 콘텐츠 제작 어플리케이션들이 일반 사용자의 참여를 돕기 위해 어떻게 변화하고 있는가를 살펴보고, 애니메이션 제작 어플리케이션은 어떻게 개선되어야 하는지 예측해 보고자 한다. 이 연구의 결과는 웹 2.0의 특성인 개방ㆍ공유ㆍ협력ㆍ참여에 부합하는 애니메이션 제작 어플리케이션 개발로 이어져 사용자가 능동적으로 애니메이션을 즐길 수 있도록 함과 동시에 1인 미디어 콘텐츠 시대에 맞는 새로운 형태의 제작 어플리케이션 개발에 도움이 되고자 한다. Since the Web 2.0 generation, the average user is more than just enjoying the various media contents; they start to create contents, and those contents have had a huge value and great influence in recent days. The reason for the increase of users who tend to create contents is due to popularization of web based applications. Previous applications were only for the skilled person; however, new web based applications involve the average person and give him a new level of user enjoyment by allowing him to create easily with simple operations. In this paper, through analysing previous animation-creating applications which could not spread widely compared to other contents, we suggest the outline for developing a web based animation-creating application which can help the user to easily create animation contents. We have looked around at how various other contents-making applications have been changed to help the user to be able to participate in creating contents, and we suggest how animation-creating applications can be changed and developed from this analysis. We expect the conclusion of this paper to stimulate to development acting 3D animation-creating applications corresponding to the web 2.0 features - open, share, cooperate, participate. In result, users can enjoy creating the animation more actively; at the same time, we hope to help the development of the new applications which correlate to memedia generation.
추연준(Yeon-Jun Choo),강보선(Bo-Seon Kang) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
The holographic velocimetry system has a significant potential for the measurements of three dimensional velocities of particles. In this study, orthogonal two-side holography system was developed to obtain three dimensional velocities and sizes of spray droplets. To get high quality of reconstructed images, singe-exposure holography at two time moments and two orthogonal sides was adopted instead of multi-exposure, single-side holography. From three dimensional positions of droplets determined by reconstruction and image processing system, the three dimensional velocities and sizes of each droplet was extracted using the PTV algorithm. To determine the position of particles in the optical axis, a new focusing parameter was introduced based on the correlation between two droplet images at the same distance. The measured results by holography system were compared with those by the PDPA.