• 제목/요약/키워드: Illumination simulation

검색결과 190건 처리시간 0.026초

효율적 게임개선을 위한 프레넬수학모델의 PBR 시뮬레이션 (PBR(Physically based Render) simulation considered mathematical Fresnel model for Game Improvement)

  • 김성동
    • 한국게임학회 논문지
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    • 제16권1호
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    • pp.111-118
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    • 2016
  • 본 논문은 빛의 조명으로 defense 게임 플레이에 대한 캐릭터 표면모델을 시뮬레이션하는 데프레넬의 수학적 모델을 제안한다. 여기서 illumination은 게임에서 사용되는 캐릭터표면 모델에 도달하는 빛의 양을 결정하는 프로세스를 나타낸다. 캐릭터 표면의 shader는 일반적으로 빛이 triangle에 반영하는 방법 즉 예측하는 수학적 모델을 사용한다. shading은 일반적으로 색상과 빛의 강도를 결정하기 위해 사용되는 방법인데, viewer에서 본다면 게임 캐릭터의 표면 위에 각 픽셀에 대한 반사결과를 나타낸다. 여기서 제안 모델은 반사와 투과 계수를 계산하여 실제 게임 플레이를 하면서 프레넬 방정식으로 시뮬레이션 결과를 비교하였다.

Two-Dimensional Sub-diffraction-limited Imaging by an Optimized Multilayer Superlens

  • Ahmadi, Marzieh;Forooraghi, Keyvan;Faraji-Dana, Reza;Ghaffari-Miab, Mohsen
    • Journal of the Optical Society of Korea
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    • 제20권6호
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    • pp.653-662
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    • 2016
  • An optimized multilayer superlens is designed, using a rigorous and efficient approach based on the method of moments (MoM) in conjunction with a simulated annealing (SA) algorithm. For the MoM solution, fast evaluation of closed-form Green's functions (GFs) in the spatial domain is performed by applying the complex-image (CI) technique, which obviates the time-consuming numerical evaluation of Sommerfeld integrals. The imaging capability of the superlens is examined with the correlation coefficient; results show that using circular polarization for the incident wave can improve this coefficient. To validate the proposed method, finite-element-based simulations are exploited, which reveal the method's accuracy and computational efficiency. Simulation results indicate that the designed structure is capable of producing two-dimensional sub-diffraction-limited images in the visible range, which may make it more versatile for practical applications. Finally, as a considerable finding, it is demonstrated for the proposed design that using circularly polarized illumination provides improved super-resolving performance, compared to linearly polarized illumination.

Fast-Converging Algorithm for Wavefront Reconstruction based on a Sequence of Diffracted Intensity Images

  • Chen, Ni;Yeom, Jiwoon;Hong, Keehoon;Li, Gang;Lee, Byoungho
    • Journal of the Optical Society of Korea
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    • 제18권3호
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    • pp.217-224
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    • 2014
  • A major advantage of wavefront reconstruction based on a series of diffracted intensity images using only single-beam illumination is the simplicity of setup. Here we propose a fast-converging algorithm for wavefront calculation using single-beam illumination. The captured intensity images are resampled to a series of intensity images, ranging from highest to lowest resampling; each resampled image has half the number of pixels as the previous one. Phase calculation at a lower resolution is used as the initial solution phase at a higher resolution. This corresponds to separately calculating the phase for the lower- and higher-frequency components. Iterations on the low-frequency components do not need to be performed on the higher-frequency components, thus making the convergence of the phase retrieval faster than with the conventional method. The principle is verified by both simulation and optical experiments.

Design and Implementation of Green Coastal Lighting System for Entrance to Coastal Pier

  • Jae-Kyung Lee;Jae-Hong Yim
    • 한국항해항만학회지
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    • 제47권2호
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    • pp.85-92
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    • 2023
  • The hardware of an LED lighting control system for coastal lighting at coastal pier entrance consists of a power supply unit, an AVR control unit, a CLCD output unit, an LED control unit, a scenario selection switch unit, and an operation speed display unit. It is made of an 8-channel. The CPU used ATmega128 and the FET was used to control the current signal. To operate the CPU, DC 12V was converted to DC 5V using a regulator 7805. A heat sink was used to remove heat generated in the FET. By connecting the load LED module to the manufactured 8-channel LED lighting control system, the operation was confirmed through various production scenarios. In addition, a control system was designed to show the most suitable color for the atmosphere of the coastal pier according to the input value of temperature and illumination using a fuzzy control system. Computer simulation was then conducted. Results confirmed that fuzzy control did not need to store many data inputs due to characteristics of artificial intelligence and that it could efficiently represent many output values with simple fuzzy rules.

Digital Image Simulation of Electro-Optical Camera(EOC) on KOMPSAT-1

  • Shim, Hyung-Sik;Yong, Sang-Soo;Heo, Haeng-Pal;Lee, Seung-Hoon;Oh, Kyoung-Hwan;Paik, Hong-Yul
    • 대한원격탐사학회:학술대회논문집
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    • 대한원격탐사학회 1999년도 Proceedings of International Symposium on Remote Sensing
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    • pp.349-354
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    • 1999
  • Electro-Optical Camera (EOC) is the main payload of the KOMPSAT-1 satellite to perform the mission of cartography that builds up a digital map of Korean territory including a digital terrain elevation map. This paper discusses the issues of the digital image simulation of EOC for the generation of EOC simulated scene as taken by EOC at 685km altitude on orbit. For the purpose, simulation work has been performed with the sensor models of EOC and the satellite platform motions models through image chain analysis from the illumination source (Sun) to a simulated image output in digital number. MODTRAN fur radiance calculation, MTF models of optics, detector and motions of EOC for system point spread function (PSF), and signal chain equations for digital number output are described. Several noise models of EOC are also considered. The final output is the EOC simulated image in digital number. The simulation technique can be used in several phase of a spaceborne electro-optical system development project, feasibility study phase, design, manufacturing, test phases, ground image processing phases, and so on.

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시뮬레이션 분석을 통한 반사거울 시스템의 터널 적용성 연구 (A study on applicability of mirror reflector system in tunnel using simulation)

  • 이범석;이근일;정인영
    • 한국터널지하공간학회 논문집
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    • 제13권5호
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    • pp.371-383
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    • 2011
  • 터널은 밝기가 급변하는 공간으로 운전자의 안전을 위해 조도의 확보가 중요하고, 터널의 조명설비는 주간과 야간에 모두 운영되고 있어 많은 전기 에너지가 소비되고 있다. 따라서 본 연구는 주간에 터널의 자연채광을 효율적으로 이용하여 에너지를 절약할 수 있는 방안으로 RADIANCE 시뮬레이션 프로그램을 사용하여 자연채광 반사거울 시스템의 채광 성능을 평가해 보았다. 프로그램을 사용하여 바(bar)형식과 폴(pole)형식으로 구분하여 벽면과 바닥면으로 주광을 유입한 결과 터널입구부로부터 20 m에서 바형식의 형태가 터널내부의 높은 조도를 확보하는 것으로 나타났다.

무대조명 프레지널 스폿조명과 플라노 컨백스 스폿조명의 조도 및 배광비교에 관한연구 (A Study on the comparison of illuminace simulations and measured values of compare a stage and broadcasting Fresnel and Plano Convex lighting fixture In studio)

  • 이장원;권기태;노재엽;이진우
    • 한국조명전기설비학회:학술대회논문집
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    • 한국조명전기설비학회 2009년도 추계학술대회 논문집
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    • pp.107-112
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    • 2009
  • 실내 무대조명 프레지널 스폿조명과 플라노 컨백스 스폿조명의 조도 시뮬레이션을 수행하여 얻은 결과치와 실제로 스튜디오상에서 설치 후 조도값을 실측한 결과를 비교하여 발생하는 오차에 대하여 비교 연구 하였다.

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다양한 형태의 조명(형광등) 전력제어 실증시험을 통한 비용효과적인 전력수요관리방법 도출 (A Study on the Cost Effective DSM Method for Lighting Power Control through Pilot Test Based on Pre-Verified Methodologies)

  • 양승권;김대영
    • 조명전기설비학회논문지
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    • 제27권2호
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    • pp.7-13
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    • 2013
  • The portion of lighting power consumption for our country is up to 20~30% of the total amount. Currently, most of the DSM(Demand side management) of lighting power is delivered in supply of high efficient lighting to customers. On the contrary, applications of lighting power to power load leveling are still rare. In this paper, the simulations for various control types of lighting power for load leveling are tried, and we obtained the cost effective and optimal control method through that. This simulation was executed in test office with fluorescent light by us based on applying 8 control types(on, off & dimming), considering customers' satisfaction, for instance, minimum intensity of illumination allowed. According to the result of this test, we found that mixed type(chessboard(on-off) plus dimming control(10%)) is most effective.

쇼트키 장벽 트랜지스터의 빛 조사에 따른 전기적 특성 연구 (Electric characteristics of Schottky barrier Field Effect Transistors with Halogen and Deuterium lamp)

  • 황민영;구상모
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2010년도 하계학술대회 논문집
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    • pp.348-348
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    • 2010
  • Nanostructures have great potential in various devices due to the their promising electronic and optical properties. Nano-patterned the front surface of a solar cell generally results in improved performance, mostly due to an increase in the short-circuit current by the incident photons strike the cell surface at an angle. In this work, we investigate AFM-assisted nano-patterned field effect transistors (FETs) with vairous silicon oxide distance value D, from ${\sim}0.5{\mu}m$ to $1{\mu}m$. Also, we compared the electro-optical characteristics of the patterned FETs and the non-patterned FETs (reference device) based on both 2-dimensional simulation and experimental results for the wavelength from 100nm to 900nm. In addition, we report electric characteristics for illuminated surface in schottky barrier field effect transistors (SB-FETs).

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Energetic Disorder Dependence of Optimal Trap Depth in the Space Charge Field Formation for Photorefractivity

  • Lee, Choong-Keun;Park, Sun-Kyung;Yang, Min-O;Lee, Nam-Soo;Kim, Nak-Joong
    • Bulletin of the Korean Chemical Society
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    • 제28권3호
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    • pp.447-450
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    • 2007
  • Trap effects on the formation of space-charge field (SCF) associated with the photorefractivity of nonlinear optical polymers were studied by the Monte Carlo simulation using modified Gaussian disorder model. The charge transport dynamics influenced by the presence of trap molecules controls the formation of SCF via the charge distribution. Temporal behavior of SCF formation and SCF dependence on the trap depth are discussed in terms of the concentration and distribution of charges (holes and ionized acceptors) developed following illumination of light. The correlation of the trap depth and the energetic disorder is presented for an optimal efficiency for the SCF formation.