• 한국콘텐츠학회논문지
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• 제11권3호
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• pp.137-146
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• 2011

스마트폰과 태블릿 PC 같은 모바일 기기의 보급과 콘텐츠 사용 증가로 모바일 환경에서의 컴퓨터 그래픽스 연구가 활발하게 진행되고 있다. 그러나 아직까지 수묵화 및 담채 렌더링 기법과 같은 비실사적 기법을 모바일 기기 상에서 효과적으로 구현하기 위한 연구는 부족한 편이다. 모바일 기기는 데스크 탑 환경에 비해 하드웨어적 한계를 가지고 있기 때문에 비실사적 렌더링 기법이 적용된 콘텐츠를 렌더링 하기 위해서는 단말기의 제약성을 고려한 특화된 렌더링 파이프 라인이 필요하다. 본 논문에서는 비실사적 기법중에서도 수묵화 기법과 담채화 기법을 모바일 환경에서 구현하기 위한 3차원 그래픽스 렌더링 파이프라인과 쉐이딩 파일 전처리 기법을 제안한다. 제안하는 기법을 이용하면 비사실적 렌더링이 적용된 다양한 3D 모바일 콘텐츠를 생성할 수 있고 사용자는 모바일 디스플레이 환경에서 실시간으로 수묵 담채 렌더링 된 콘텐츠를 볼 수 있을 것으로 기대한다.

• 한국실내디자인학회논문집
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• 제14호
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• pp.19-26
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• 1998

The purpose of this research is to examine the scope and effectiveness of the utilization of computer programs in universities and educational institutions teaching and training subjects related to interior construction such as interior and exterior design display coloring furniture design perspective drawing expression technique space planning lighting design and portfolio production. The list of currently available non-CAD computer programs for these purpose and the effectiveness of utilizing adobe photoshop in interior design will be examined.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2007년도 Proceedings of ISRS 2007
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• pp.548-551
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• 2007

Among components of digital topographic maps used officially in Korea, only contours have 3D values except buildings and trees that are demanded in landscape planning. This study presented a series of processes for 3Dreconstructing landscape features such as terrain, buildings and standing trees using LiDAR (Light Detection And Ranging) data and aerial digital photo graphs. The 3D reconstructing processes contain 1) building terrain model, 2) delineating outline of landscape features, 3) extracting height values, and 4) shaping and coloring landscape features using aerial photograph and 3-D virtual data base. LiDAR data and aerial photograph was taken in November 2006 for $50km^{2}$ area in Sorak National Park located in eastern part of Korea. The average scanning density of LiDAR pulse was 1.32 points per square meter, and the aerial photograph with RGB bands has $0.35m{\times}0.35m$ spatial resolution. Using reconstructed 3D landscape features, visibility with the growing trees with time and at different viewpoints was analyzed. Visible area from viewpoint could be effectively estimated considering 3D information of landscape features. This process could be applied for landscape planning like building scale with the consideration of surrounding landscape features.

• 한국기계가공학회지
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• 제14권3호
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• pp.21-26
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• 2015

Many 3D printing technologies are being used in various industries, and their demands for well-educated engineers are increasing. Moreover, novel technologies are being developed to overcome the limits of existing 3D printing technologies. In this regard, adequate education and a related curriculum especially in the Mechanical Engineering field, which is the basis of the industry, is essential. In this paper, the development of the 3D printing curriculum and its assessment in Mechanical Engineering education are proposed. The education program consisted of lectures and practice. It consisted of major 3D printing technologies, such as SLA, FDM, SLS, LOM, and Polyjet. Moreover, post-processing, room temperature vulcanizing (RTV), and coloring were also taught. The effectiveness of the proposed education program was assessed by the questionnaire survey, and the results were analyzed. Areas of improvement were deduced from the survey results.

• 한국시뮬레이션학회:학술대회논문집
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• 한국시뮬레이션학회 2005년도 추계학술대회 및 정기총회
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• pp.84-90
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• 2005

본 연구는 임의의 지역을 선정하여 그 지역의 환경 색채를 분석한 후 NCS색체계와 히스토그래밍을 이용하여 주조색, 보조색, 강조색을 추출한 후 그 지역의 특성에 맞는 배색코드들을 제안한다. 이를 위해 색채조화론에 근거한 Color Dictionary를 제작하였으며 특정 지역을 3D모델링 한 최적의 배색 코드를 추출하여 주변 환경과 잘 어울리는 색채 시뮬레이션을 제시하고 Web3D 표준기술을 이용하여 상호작용과 다양한 뷰포인트에서 시연할 수 있는 프로그램 환경을 구축하였다. 이에 따른 기대효과는 첫째, 국가 홍보에 있어서 경쟁력 제고를 위한 효과. 둘째, 도시환경 색채계획의 기준틀 제시. 셋째, 색채계획의 단순화. 넷째, 도시문화를 형성. 다섯째, 색채계획에 관련된 학문에 응용 가능. 여섯째, 국가 문화산업, 콘덴츠 등 발전에 기여할 것으로 생각된다.

• International Journal of CAD/CAM
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• 제1권1호
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• pp.1-9
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• 2002

The STL or Stereolithography format, established by 3D systems, gathers the geometric data of the model in a number of triangular surfaces. It can be in ASCII or binary format, and is a de facto standard in the Rapid Prototyping (RP) world. RP has developed greatly over the last ten years. In particular, improvement in materials has meant greater part accuracy and strength, which in turn has increased the range of functional applications. Future applications of RP will focus on rapid tooling and direct manufacturing. Direct manufacturing in particular may see much benefit from the incorporation of color into models. For color RP, besides designing new hardware to add color into the prototypes, it is necessary to redefine the CAD software for adding and accurately positioning color onto the model. STL cannot effectively store this kind of information. Among the existing data file formats, VRML is an acceptable one that is complimentary to existing RP processes. This paper acts as a review to discuss several methods of using VRML for coloring model data. This paper will also discuss the problems occurred in coloring the layer contours of the RP model.

• 보존과학회지
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• 제38권1호
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• pp.55-63
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• 2022

The Bigyeokjincheolloe (bomb shell), a scientific cultural heritage, has outstanding historical value for sustaining a gunpowder weapon of Joseon. In this study, the bomb shell was modeled through three-dimensional (3D) scanning centered on the external shape and 𝛾-ray radiography-based on the internal shape. In particular, to improve the contrast in the radiographic image, optimization and image processing were performed. After these processes, the thickness of the inner wall (2.5 cm on average) and the positions of the three mold chaplets were clearly revealed. For exhibition purposes, the 3D model of the bomb shell was output to a 3D printer and the output was rendered realistic by coloring. In addition, the internal functional elements, such as Mokgok, fuse, mud, gunpowder, and caltrops, were reproduced through handwork. The results will contribute to the study of digital heritages in two ways. First, the internal and external shapes of the bomb shell were modeled by fusing two different technologies, namely, 3D scanning and 𝛾-ray radiography. Second, the internal shape of the bomb shell was constructed from the original form data and the reproduction was utilized for museum exhibitions. The developed modeling approach will greatly expand the scope of museum exhibitions, from those centered on historical content to those centered on scientific content.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2016년도 추계학술발표대회
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• pp.691-692
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• 2016

현재 많은 증강현실 콘텐츠는 장면에 따른 미리 지정된 3D 모델을 표시하고 있다. 이렇게 고정된 모델만 표시하는 콘텐츠는 짧은 사용시간을 가지게 된다. 본 논문에서는 증강현실 콘텐츠의 사용시간을 늘리기 위해 증강현실의 마커 이미지를 실시간으로 추출하는 기법을 이용한 컬러링 종이 증강현실 콘텐츠를 제작하였다. 이 콘텐츠는 사용자가 컬러링 종이에 있는 도면에 채색하면, 채색된 도면의 내용을 반영한 3D 모델을 표시하는 증강현실 콘텐츠이다.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2016년도 춘계학술발표대회
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• pp.787-788
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• 2016

현재 많은 증강현실 콘텐츠는 장면에 따른 미리 지정된 3D 모델을 표시하고 있다. 이렇게 고정된 모델만 표시하는 콘텐츠는 짧은 사용시간을 가지게 된다. 본 논문에서는 증강현실 콘텐츠의 사용시간을 늘리기 위해 증강현실의 마커 이미지를 실시간으로 추출하는 기법을 이용한 컬러링 종이 증강현실 콘텐츠를 제작하였다. 이 콘텐츠는 사용자가 컬러링 종이에 있는 도면에 채색하면, 채색된 도면의 내용을 반영한 3D 모델을 표시하는 증강현실 콘텐츠이다.

• The Journal of Advanced Prosthodontics
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• 제5권3호
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• pp.296-304
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• 2013

PURPOSE. The aim of this study was to evaluate the effect of polishing and glazing on the color and spectral distribution of monolithic zirconia. MATERIALS AND METHODS. Forty-five monolithic zirconia specimens ($16.3mm{\times}16.4mm{\times}2.0mm$) were fabricated and divided into 5 groups according to the number of A2-coloring liquid applications (Group I to V). Each group was divided into 3 subgroups according to the method of surface treatments (n=3): N: no treatment; P: polishing; G: glazing. Color and spectral distribution of five different areas of each specimen were measured according to CIELAB color space in the reflectance mode relative to the standard illuminant D65 on a reflection spectrophotometer. Data were analyzed using one-way ANOVA followed by Tukey's HSD test, Pearson correlation and regression analysis (${\alpha}$=.05). RESULTS. There was a significant difference in CIE $L^*$ between Subgroup N and P, and in CIE $b^*$ between Subgroup P and G in each group. Spectral reflectance generally decreased in Subgroup P and G in comparison with Subgroup N. Color differences between Subgroup P and G were within the perceptibility threshold (${\Delta}E{^*}_{ab}$ < 3.7) in most groups. Highly significant correlation was found between CIE $b^*$ and each subgroups as the number of coloring liquid applications increased ($R^2$ >0.88, P<.001). CONCLUSION. A perceptible color difference can be detected after polishing of monolithic zirconia. Polishing decreases the lightness, and glazing also decreases the lightness, but increases the yellowness of monolithic zirconia.