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3D 시각효과에서의 에너지 이동 및 전환에 관한 연구 -회오리 효과의 사실적인 형태와 운동 구현을 중심으로-
황민식(Hwang Min-sik) 한국만화애니메이션학회 2021 만화애니메이션연구 Vol.- No.65
영화, 영상, 애니메이션 등의 다양한 콘텐츠는 관련 제작 기술의 발달과 서비스 활성화를 통해 점차 그 영역을 확대해나가고 있다. 과거에 극장을 찾던 소비자들은 고화질 휴대용 기기의 보급, 5G 시대의 도래, OTT 서비스 활성화 등에 따라 장소에 구애받지 않고 콘텐츠를 쉽고 간편하게 즐기는 것이 가능하게 되었다. 그에 따른 소비 트랜드 또한 크게 변화되고 있는데, 온라인 스트리밍을 통해 서비스되는 콘텐츠는 높은 완성도의 시각화 구현과 스토리텔링으로 극장 개봉작을 뛰어넘는 만족감과 몰입감을 소비자들에게 제공한다. 이는 3D 컴퓨터그래픽 관련 기술, 특히 시각효과(Visual Effects)의 급격한 발달과 전문 인력의 시장보급 활성화에서 기인한다. 하지만 여전히 사실적이고 완성도 높은 CG 효과구현을 위해서는 숙련도 있는 작업자의 반복적인 테스트를 동반한 높은 시간 소요가 요구된다. 특히 높은 수준의 컴퓨터그래픽이 선사하는 시각적 만족도는 작품에 대한 몰입감을 높이는 데 있어 크게 기여하기 때문에 그 요구치는 계속해서 증가하고 있다. CG 효과의 완성도를 결정하는 중요한 요소 중 하나는, 현실의 물리법칙에 따라 자연현상을 얼마나 사실적으로 구현하고 이질감 없이 표현할 수 있는가 하는 것이다. 자연현상은 비, 눈, 안개, 번개 등과 같이 날씨와 관련된 일상적인 것에서부터 지진, 쓰나미, 화산폭발, 토네이도 등과 같이 문명과 인간에게 큰 해를 입히는 자연재해에 이르기까지 종류가 매우 다양하다. 자연재해는 흔히 재난형 블록버스터라는 장르가 생겼을 정도로 영화에 자주 등장하는 소재이기도 하며 대규모의 사실적이고 웅장한 재해 장면을 연출하기 위해서는 많은 시간과 비용, 인력과 기술력이 요구된다. 본 연구에서는 실제 물리법칙에 근거하여 여러 현상이 만들어내는 에너지가 이동되고 변환되는 과정을 통해 효과들이 자연스럽게 연결되면서 구현되는 사실적인 회오리(Tornado) 시각효과 제작공정을 실험하고자 한다. 실험연구의 과정은 첫째, 회오리의 사실적인 형태와 운동 형성, 둘째, 회오리를 따라 회전하는 다수의 파편 표현, 셋째, 회오리에 의해 파괴되는 주변 환경 구현이다. 보다 효율적으로 완성도 높은 결과물이 생산 가능한 파이프라인을 설계하는 과정을 체계적으로 진행하여 향후 관련 산업 연구자나 종사자를 위한 연구자료로 활용 가능한 유의미한 연구가 되리라 사료된다. Various forms of entertainment content such as movies, videos, and animations are gradually expanding their scope through the development of their production technology and services. Instead of looking for theaters for entertainment, people now enjoy entertainment content easily and conveniently no matter where they are due to factors such as the spread of high-definition portable devices, the advent of the 5G era, and the expansion of OTT services. As a result, consumption trends are also changing significantly. Content on online streaming platforms provides consumers with a sense of satisfaction and immersion that exceeds that of movie releases through high-quality visualization and storytelling. This is due to the rapid development of 3D computer graphics technology, especially visual effects and the labor market turnaround for professional manpower in the field. However, realizing realistic and high-quality CGI effects is a time consuming job requiring repeated tests by skilled workers. In particular, satisfying visual experience provided by quality computer generated imagery greatly contributes to increasing immersion in the video work, so the demand for high quality CGI continues to increase. One of the important factors that determines the degree of completeness of CGI is how realistically natural phenomena can be expressed in accordance with natural laws. Natural phenomena are very diverse, from everyday weather-related events such as rain, snow, fog, and lightning to natural disasters that cause great harm to civilizations and humans, such as earthquakes, tsunamis, volcanic eruptions, and tornadoes. Natural disasters are a popular subject that appears in movies so that ‘disaster blockbuster’ became a separate genre. It requires a lot of time, money, manpower and technical skills to produce largescale, realistic and magnificent disaster scenes. This study aims to experiment several processes of visual effects to create a realistic tornado simulated by movements and transformation of energy created by various phenomena based on actual physical laws. The first process of this experimental research is on forming realistic shapes and motions of the tornado. The second process to be studied is the expression of multiple fragments rotating along the tornado and the third is the realization of the surrounding environment destroyed by the tornado. By systematically proceeding with the processes of designing a pipeline that can efficiently produce high-quality results, this study is expected to become relevant research data for researchers and workers in related industries in the future.
황민식 ( Min Sik Hwang ),김영돈 ( Young Don Kim ),신사영 ( Sa Young Shin ),전제혁 ( Jae Hyuck Jun ),홍종삼 ( Jong Sam Hong ),엄대운 ( Dae Woon Eom ),천갑진 ( Gab Jin Cheon ) 대한소화기학회 2016 대한소화기학회지 Vol.68 No.4
Endometriosis is a benign gynecologic disease, characterized by the presence and growth of functional endometrial-like tissue outside uterus. This ectopic endometrial tissue is most commonly found in the peritoneum, ovaries and uterosacral ligaments, but extremely rarely there is involvement of the appendix or cecum. Here we report a case of cecal endometriosis presenting as a subepithelial tumor diagnosed by surgical excision. (Korean J Gastroenterol 2016;68:214-217)
황민식(Min Sik Hwang) 한국멀티미디어학회 2016 멀티미디어학회논문지 Vol.19 No.8
As the visual effect frequently used in movies or animations, special effects are well suited for the creation of buildings or materials destruction and collapse scenes. With the relevant programs developing technologically, the adoption of a real-time physically based-system makes it possible to realistically express dynamic simulations. In the large scale, the visual expression of such effects of destroying is satisfying enough, but most common programs of those effects fail to maximize visual effect generated with the cutting of small materials. Besides, to perform a heavy simulation process needs high-performance hardware and programs, where high costs would become a serious issue. For this reason, this paper suggests a solution optimized for the effect of small materials-cutting. The progress of each step shows technologies which trace movement with the state of the completion of the characters motions and then cut the material in real-time, finally led to the very realistic visual effect. Besides, using vector inner calculation to follow the motions of object and to realize cutting effect, this study provides an experiment that constructs visual effect for visualization from the basis of mathematical algorithm and it would be certainly as an educational material used for further researches.
촉매의 조건에 따른 수소/산소 혼합 기체의 점화 특성 연구
황민식(Minsig Hwang),신종민(Jongmin Shin),노태성(Tae Seong Roh),이형진(Hyoung Jin Lee) 한국연소학회 2021 한국연소학회지 Vol.26 No.3
A fundamental study was conducted to develop a combustor system using hydrogen catalyst reaction as an ignition source. Several variable conditions were selected to analyze the ignition characteristics using the catalyst; the main catalyst component, reduction temperature and reaction surface area of catalysts, and the equivalent ratio of the mixture gas. The platinum(Pt) catalyst was finally selected because of its excellent reactivity. The ignition performance was best when catalysts were reduced at 300°C. Moreover, the ignition performance was improved with a larger surface area and low equivalence ratio of mixture gas. XRD analysis and SEM photography were performed to identify the formation and crystallization of nano Pt particles. The analysis showed that Pt (111) crystals had the highest distribution at a reduction temperature of 300°C. Nano Pt particles were well-formed in the catalysts, but excessive heating degrades the catalysts" performance. This study identified the ignition characteristics of Pt catalysts, and successful catalytic ignition was observed in the designed experimental system.