• 대한전기학회논문지:시스템및제어부문D
• /
• 제50권3호
• /
• pp.149-157
• /
• 2001

In the video retrieval system, visual clues of still images and motion information of video are employed as feature vectors. We generate the temporal textures to express the motion information whose properties are simple expression, easy to compute. We make those temporal textures of wavelet coefficients to express motion information, M components. Then, temporal texture feature vectors are extracted using spatial texture feature vectors, i.e. spatial gray-level dependence. Also, motion amount and motion centroid are computed from temporal textures. Motion trajectories provide the most important information for expressing the motion property. In our modeling system, we can extract the main motion trajectory from the temporal textures.

• 한국소성가공학회:학술대회논문집
• /
• 한국소성가공학회 2008년도 춘계학술대회 논문집
• /
• pp.411-414
• /
• 2008

In order to study the effect of lubrication during hot rolling, ferritic stainless steel (FSS) sheet were hot-rolled with and without application of lubrication. The effect of two hot rolling processes on the evolution of texture and microstructure after hot rolling, cold rolling and subsequent recrystallization annealing was studied by means of macro-texture analysis and microstructure observations. After hot rolling, the specimen rolled with lubrication showed rolling textures at the sheet surface, while the specimen rolled without lubrication displayed shear textures in the outer layers of the sheet. Hot rolling with lubrication was beneficial to the formation of strong recrystallization textures at sheet surface. However, hot rolling with lubrication led to the formation of orientation colonies in outer thickness layers of the recrystallized sheet.

• 대한금속재료학회지
• /
• 제47권6호
• /
• pp.356-362
• /
• 2009

In order to vary the primary recrystallization textures, AA 1050 sheets were cold rolled in two different manners. Differences in cold rolling schedule gave rise to the formation of different cold rolling textures also leading to the formation of different primary recrystallization textures. Upon annealing for grain growth, changes in microstructure and texture hardly occurred in the sample depicting Cube recrystallization texture, while grain growth was accompanied with the development {001}<100> Cube texture in the sample displaying a recrystallization texture comprising of weak rolling texture components. The selective growth of Cube oriented grains is attributed to the high mobility of their grain boundaries.

• 한국신재생에너지학회:학술대회논문집
• /
• 한국신재생에너지학회 2010년도 추계학술대회 초록집
• /
• pp.38.2-38.2
• /
• 2010

Biomimetc is a new domain of learning that proposes a solution getting clues from nature. There seems to be a sign of this phenomenon in fields of Renewable Energy. Foe example, Wind power was imitate the whale's fin that was improve efficiency of generating energy. This study focused on the photovoltaic generation as the instance of applying biomimetic. Efficiency is the most important factor in field of Photovoltaic generation. When given solar cell taking the sun light, most important fields of the study are absorb more light and increase the quantity of generation. For improving efficiency, the solar cell were builded up textures of taking a pyramid form, such a surface structure taking a role for remaining the light. This effects do the role as increasing absorbing efficiency. Such phenomenon calls Light Trapping, locking up the light on the surface of solar cell for a long time. Light is a vital factor to plants in the nature. Plants grow up through the photosynthesis that absorbing light for growth and propagation. So, plants make a effort how can absorb more the light in poor surroundings. This study set up a goal that imitates the minute surface structure of plants and applies to the existing solar cells's surface structure, so it can improve the efficiency of absorbing light. We used Light Tools software analyzing geometrical optics to analyze efficiency about new designed textures on the computer. We made a comparison between existing textures and new designed textures. Consequently, new designed textures were advanced efficiency, absorbing rates of light increasing about 7 percent. In comparison with existing and new textures, advancing about 20 percent in the efficient aspect.

• 대한전자공학회논문지SP
• /
• 제43권3호
• /
• pp.68-75
• /
• 2006

본 논문에서는 인간의 시각 특성(Human Visual System)과 3D-DCT(Three Dimensional Discrete Cosine Transform) 블록 특성을 이용한 적응적인 비디오 워터마킹 방법을 제안한다. 3D-DCT 계수들의 분포에 따라 3D-DCT 블록을 움직임과 텍스쳐 모두 있는 블록, 움직임은 거의 없고 텍스쳐만 있는 블록, 움직임과 텍스쳐 모두 거의 없는 블록 등 3가지 패턴으로 분류한다. 또한 분류된 3D-DCT 블록의 패턴 비율에 따라 영상을 움직임과 텍스쳐 모두 있는 영상, 움직임은 거의 없고 텍스쳐만 있는 영상, 움직임과 텍스쳐 모두 거의 없는 영상 등 3가지 타입으로 분류한다. 제안된 워터마크 삽입 방법은 분류된 3D-DCT 블록패턴과 영상 타입에 따라 적응적으로 학습된 민감도 테이블과 비례 상수를 이용하여 입력 비디오 영상의 3D-DCT 중간 대역 계수에 적응적으로 워터마크를 삽입한다. 실험 결과들은 제안된 방법이 투명성과 강건성에서 이전 방법보다 우수함을 보인다.

• 한국게임학회 논문지
• /
• 제8권1호
• /
• pp.49-58
• /
• 2008

본 논문에서는 실사 영상을 사용하여 3차원 아바타의 얼굴 텍스쳐를 생성하는 기법을 제시한다. 먼저 UVW 맵을 기준으로 실사영상에서의 해당 영역을 수동으로 지정한다. 그 다음 지정된 영상 영역들을 사용하여 UVW 맵에 해당하는 텍스쳐 영상을 생성한다. 제안된 텍스쳐 생성 기법은 포토샵 등을 사용한 기존의 방법에 비해서 수작업 시간을 단축할 수 있으며 실사 영상의 사실감을 높여준다. 기존의 텍스쳐 생성 절차들은 3차원 모델의 메쉬 구조에 영향을 주었으나, 제안된 방법은 3차원 모델의 메쉬 구조를 수정하지 않고도 원하는 형태의 텍스쳐를 생성할 수 있는 장점이 있다. 실제 사람의 모습을 여러 각도에서 촬영하여 얻은 영상을 사용하여 주어진 UVW 맵에 적합한 얼굴 텍스쳐를 생성하였다. 생성된 텍스쳐를 사용하여 3차원 아바타를 렌더링한 결과 아바타 얼굴의 사실감이 증가되었음을 알 수 있었다.

• 호남수학학술지
• /
• 제21권1호
• /
• pp.171-177
• /
• 1999

We find the properties of the defects and textures in an ordered medium. Especially, the space X, e.g., the residually solvable space or space satisfying the conditions ($T^{**}$) with respect to the defect and texture.

• 자원환경지질
• /
• 제39권6호
• /
• pp.663-674
• /
• 2006

금광상에서 암석의 구조, 구조선에 따른 열수의 이동, 천열수 맥 구조, 광화작용상태 및 구성광물등을 정밀하게 분석하는 것은 광상의 배태현황, 천열수에 따른 열수광상의 성인을 확인하는 데 매우 중요하다. 따라서, 본 연구의 목적은 컬러코어스캐너 기법에 의해 구조선에 따른 열수의 이동 및 천열수 맥 구조 등에 대한 정밀한 정보를 통해 금광 배태상황과 성인을 연구하는 데 있다. 컬러코어스캐너 기법은 전남 해남지역 순신 금광산에서 천공된 3개 시추공의 시추코어 전체를 디지털 영상자료(digital image data)화하였다. 디지털 시추코어자료에서는 금이 배태하는 여러 형태의 천열수 맥 구조가 정밀하게 분석되었다. 즉, 빗살구조형, 정동구조형, 엽편상구조형, 각력구조형, 누대구조형 및 혼합구조형 등이다. 또한, 금광상 배태는 대부분 맥상체 형태의 구조들에 많이 배태하나 고품위의 금광은 각력상 형태의 구조내에 많이 배태하고 있음이 특징적이다. 금광상의 성인은 전형적인 천열수 금광상이다. 컬러코어스캐너 기법에 의한 디지털 시추코어 영상자료는 육안관찰에서 빠뜨린 부분을 다시 볼 수 있고, 반복해서 관찰 할 수 있기 때문에 암석내에 발달하는 구조상태 및 광상의 배태 현황 및 광상의 성인을 규명하는데 매우 유익하다고 판단된다.

• 한국정밀공학회지
• /
• 제28권9호
• /
• pp.1086-1093
• /
• 2011

To fabricate the aluminum alloys with good drawability, the textures evolution of the AA5182 sheets due to the change of lid parameter after rolling and subsequent annealing was studied. The measurement of the deformation textures was carried out for the sheets with high reduction ratio and the change of the recrystallization texture was investigated after heat-treatments of the rolled sheets in various I/d parameters. Rolling without lubrication and subsequent annealing led to the formation of favorable rot-$C_{ND}$ {001}<110> and ${\gamma}$-fiber ND//<111> textures in AA5182 sheets. From the results, the ${\gamma}$-fiber ND//<111> component well evolved during rolling at high lid parameter of 6.77. The initial shear deformation texture, especially, ${\gamma}$-fiber ND//<111> was not rotated during heat treatment in holding time of 180~7,200 seconds on AA5182 with I/d parameter of 6.77. Therefore, the AA5182 sheets were fabricated by controlling I/d parameter having well evolved ${\gamma}$-fiber ND//<111> which was advantageous in good drawability of the sheets.

• 한국생활과학회지
• /
• 제14권4호
• /
• pp.665-671
• /
• 2005

This study aims to examine the effect of structural properties, subjective textures, sensibilities, and objective handle on the preference for weft knit fabrics, and then to provide useful information in planning and designing knit fabrics through predicting the preference. We made 20 plain knit fabrics, as specimens, with a combination of 5 kinds of wool/rayon fiber contents and 4 kinds of stitch loop length. For the subjective evaluation of textures, sensibilities, and preference, we used the questionnaire that had been developed in the previous study. The data analysis was conducted with Pearson's correlation analysis, ANOVA, Duncann multiple range test and regression analysis. The results are as follows: In relationship of structural properties and preference, we could not recognize any difference in whole ranges of wool/ rayon fiber contents and in 7.5mm and less stitch loop length. On the other hand, we could find the decrease of preference in over 7.5mm stitch loop length. As to subjective textures and sensibilities, a multiple regression analysis of preference indicated a higher determination coefficient by sensibilities than by textures. But there were little correlation between a objective handle and preference of weft knit fabrics.