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디지털 사이니지에서 응용되는 고해상도 타임랩스 영상 제작에 관한 연구
문대혁 남서울대학교 출판국 2021 남서울대학교 논문집 Vol.27 No.-
Digital signage employs Digital Information Display technology to deliver visual information. As a convergence platform of network and display, it is aimed at display or advertising in diverse places and situations. At present, for high definition, most large digital signage content images are produced with the uses of motion graphic based imaging technique or 3D animation technique. These images face a limited range of use due to degradation. The purpose of this study is to look into the production method to apply high-definition reality images with minimum degradation to digital signage by using timelapse technique. The reality images shot in this study are expected to be screened on digital signage without degradation. Key Words : Digital Signage, Time-lapse, Multimedia Contents, VFX, Editing, Motion Picture
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문대혁 남서울대학교 출판국 2022 남서울대학교 논문집 Vol.28 No.-
Multi-vision such as Digital Signage and Screen-X, having overcome the limits of a wide image, have been providing audiences with a sense of immersion as a film delivering stories through over 3-sided screen without requiring special devices. However, a number of film producers consider such multi-vision one of the difficult systems to have access to due to their stutter phenomenon, limits of stitching process and complicated system environments. In this thesis, the technical issues and characteristics related to the actualization of multi-images were examined and the optimized screen organization and directing methods were explored to propose a guideline that can be used to have convenient access to multi-vision contents for the production of high-resolution Digital Signage content. Based on the results acquired through this research, it was expected that Digital Signage systems such as multi-vision and Screen X can be recognized as a popular medium capable of providing audiences with a sense of immersion in the process of appreciating different-dimensional realistic images. Key Words : Multi-vision, Realistic Image, Panorama, Match Correction, Screen X
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권대혁 경북대학교 센서기술연구소 1996 연차보고서 Vol.1996 No.-
KOH 수용액을 이용하여 실리콘 식각공정기술을 확립하였으며, 이를 이용하여 실리콘 기판 위에 스트레스 균형이 이루어진 600 ㎚ 두께의 Si_3N_4/SiO_2/Si_3N_4 다이아프램을 제조하였다. 이때의 실리콘의 식각률은 약 1.45 ㎛/min정도였다. NON 박막과Au/NiCr/NON 박막에 대한 광투과도, 광흡수도 및 광반사율을 측정한 결과 광흡수는 두 박막에 대해 수%였다. NON 다이아프램 뒷면에 약 100 ㎚의 금을 진공증착하여 제조된 Au/NiCr/NON 박막의 광특성을 조사한 결과, 박막의 광투과도를 수%정도로 감소시킬 수 있어서 센서의 광반사막으로 사용할 수 있었다. NON 다이아프램을 이용하여 제조한 수위측정용 압력센서는 3×3 ㎟, 4×4 ㎟, 5×5 ㎟ 의 정사각형 다이아프램 크기에서 약 3.886 ㎻/㎪, 4.857 ㎻/㎪ 및 5.829 ㎻/㎪의 압력감도를 나타내었으며, 광출력은 인가압력이 증가함에 따라 감소하였다. 광손실을 줄이기 위해 광송수신용 광섬유를 코아 직경이 62.5 ㎛인 멀터모드 광섬유를 사용하였고 다이아프램의 크기를 3×3 ㎟, 4×4 ㎟ 및 5×5 ㎟ 등으로 각각 변화시켜 광강도형 멀터모드 광섬유 압력센서를 제조하고 그 압력특성을 조사하였다. 측정된 광섬유 압력센서의 감도는 각각 약 20.689 ㎻/㎪, 26.694 ㎻/㎪ 및 39.331 ㎻/㎪였다. 광섬유 단면위에 RF 마그네트론 스퍼터링법으로 TiO_2를 증착하였다. TiO_2 박막의 굴절률 및 두께는 각각 약 2.43과 800 Å였다. 광섬유 Fabry-Peort 간섭계를 실리콘 다이아프램과 NON 다이아프램과 결합하여 광간섭형 압력센서를 제조하였다. 5×5 ㎟ 크기의 실리콘 다이아프램의 경우, 그 감도는 두께를 각각 15 ㎛와 50 ㎛로 변화시켰을 때 0.497 radian/㎪ 및 0.392 radian/㎪였다. 또한, 600 ㎚-NON 다이아프램의 경우에는 다이아프램의 크기fmf 2×2 ㎟, 5×5 ㎟ 및 8×8 ㎟로 변화하였을 때 약 0.119radian/㎪, 1.003 radian/㎪ 및 1.571 radian/㎪의 압력감도를 나타내었다. Using KOH solution, silicon etching technology has been established and stress-balanced flat 600 ㎚ thick triple dielectric membrane(150 ㎚-Si_3N_4/300 ㎚ -SiO_2/150 ㎚-Si_3N_4) on silicon substrate has been fabricated. At this time, etching rate of silicon was around 1.45 ㎛/min. At the wavelength of the sensor light source near 1.3 ㎛, optical loss of the NON diaphragm was decreased to a few percents by depositing 100 ㎚-Au layer on it, which is sufficient to be used as a light reflection layer of the sensor. From the optical output power-pressure characteristics of the fabricated intensity-type pressure sensors, the sensitivities of the pressure sensor for measuring water level were about 3.886, 4.857, and 5.829 ㎻/㎪ for the diaphragm sizes of 3×3 ㎟, 4×4 ㎟ and 5×5 ㎟, indicating that the output power linearly decreased with increasing applied pressure. We have used 62.5/126 ㎛ multi-mode fiber for the light transmission to minimize optical loss, and the pressure characteristics were examined for the diaphragm sizes of 3×3 ㎟, 4×4 ㎟, 5×5 ㎟. The respective sensitivities were, about 20.689 ㎻/㎪, 26.694 ㎻/㎪, and 39.331 ㎻/㎪. TiO_2 mirror at the cross section of fiber optic was deposited by using RF magnetron sputter. The refractive index and thickness of the TiO_2 thin film was about 2.43 and 800 Å. An interferometric fiber optic sensor has been manufactured using a fiber optic Fabry-Perot interferferometer and a silicon diaphragm or a NON diaphragm. For the silicon diaphragm sizes of 5×5 ㎟, the sensitivities of the sensor silicon diaphragm thickness of 15 ㎛ and 50 ㎛ were 0.497 radian/㎪ and 0.392 radian/㎪, respectively. And for the silicon diaphragm sizes of 2×2 ㎟, 5×5 ㎟, 8×8 ㎟, the sensitivities were 0.110 radian/㎪, 1.003 radian/㎪, and 1.571 radian/㎪, respectively.
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치합형 역방향회전(Intermeshing Counter-Rotating) 이축스크류식 압출기내의 등온 비뉴토니언 흐름 분석
방대석,홍명혁,정영진 國立金烏工科大學校 産業技術開發硏究院 2002 産業技術開發硏究 Vol.18 No.-
A proper and correct formulation of an isothermal non-Newtonian flow in intermeshing counter-rotating twin screw extruder modules which accounts clearly for the positive pumping displacement mechanism is presented. Screw pumping characteristic curves were determined for various typical elements of the Leistritz modular intermeshing counter-rotating twin screw extruder.
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아파트의 적정 건설층수 결정을 위한 에머지(emergy) 평가
임정혁,강대석,이석모 한국환경과학회 2005 한국환경과학회지 Vol.14 No.5
The cost of the construction and management of new apartment buildings was evaluated using a monetary analysis and an emergy concept to provide a new perspective regarding the housing policy of Korea. The systems of analyses were typical apartment buildings with an area of 76.03m² per household in Korea built on the same size of land area. Three apartment buildings with different stories were evaluated and compared; 5-story, 15-story, and 20-story apartment buildings. The durable years of those apartments were assumed to be 40 years. The total cost of the construction and management of an apartment building was divided into three categories of construction, land purchase, and management. A 20-story apartment showed the highest cost and a 15-story apartment the lowest in the monetary cost analysis. In contrast, the emergy evaluation revealed a different pattern in the cost of construction and management, the cost increasing from a 5-story apartment to a 20-story one. This means that the higher the apartment constructed, the greater the cost in terms of real wealth. This result suggests that new evaluation methodologies like the emergy analysis should be used together with the monetary analysis to provide better insights on the national housing policy.
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