• Title, Summary, Keyword: Ray Tracing Method

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A Study on the Calculation of Overshadowing Area by Ray-Tracing Method (Ray-Tracing Method를 이용한 일영면적 산정방식 고찰)

  • Choi, Jeong-Min;Cho, Sung-Woo
    • Journal of the Korean Solar Energy Society
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    • v.31 no.3
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    • pp.36-41
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    • 2011
  • Nowadays, the solar expose right is very important with people's life. Therefore, in calculating the sunshine hours, the point analysis and area analysis methods are used in previous studies. Previous two methods have merits and faults. Therefore, ray-tracing method is used as a alternative. Ray-tracing method is adopted by the software of Autodesk Ecotect which is a widely used program by the architectural company and academic university. In this study first, ray-tracing methodology is studied with how to calculate the overshadowing area and, secondly, the sensitivity of the two major factors, overshadowing accuracy and sky subdivision, is analyzed. With these results, appropriate application of the ray-tracing method is presented.

Implementation of Ray Tracing using Hit-Test Unit (Hit-Test Unit을 이용한 Ray Tracing의 구현)

  • Choi, K.Y.;Chung, D.J.
    • Proceedings of the KIEE Conference
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    • pp.402-404
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    • 1997
  • The synthesis of the 3D images is the most important part of the virtual reality. The ray tracing is the best method for reality in the 3D graphics. But the ray tracing requires long computation time for the synthesis of the 3D images. So, we implements the ray tracing with software and hardware. Specially we designs the hit-test unit with FPGA tool for the ray-tracing.

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The Axial-displaced gregorian antenna design using Ray-tracing Method (Ray-tracing 기법을 이용한 축변위 그레고리안 안테나 설계)

  • Kim, Chun-Won
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.42 no.6
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    • pp.515-521
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    • 2014
  • In this paper, we designed axis-displaced Gregorian antenna by using Ray-tracing method. This antenna improves gain, VSWR by rotating the axis of the sub-reflector to get rid of E-field wave returned from sub-reflector to feed horn. Therefore it reduce the sub-reflector size and the volume of antenna. This method is used to track the propagation path for radiation pattern of feed horn from feed horn to sub-reflector, main-reflector and air. We get E-field distribution of this antenna aperture and calculate antenna radiation pattern and optimize the antenna performance. The Ray-tracing Method was verified because the gain, radiation patterns, side lobe level, beam width and return loss of the designed antenna are very similar to CST simulation result and a measured result of the fabricated antenna.

Propagation Analysis Method in using 3D Ray Tracing Model in Wireless Cell Planning Software (무선망 설계툴에서 3 차원 광선 추적법을 이용한 전파해석 방법)

  • Shin, Young-Il;Jung, Hyun-Meen;Lee, Seong-Choon
    • 한국정보통신설비학회:학술대회논문집
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    • pp.251-255
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    • 2007
  • In this paper, propagation analysis method in using 3D Ray Tracing propagation model in wireless cell planning is proposed. Through 3D Ray Tracing model, we can predict the distribution of propagation loss of the received signal. For correct and a low complex analysis, Quad Tree and Pre-Ordering and Hash Function algorithms are included in 3D Ray Tracing algorithm. And 3D Ray Tracing model is embodied in CellTREK that is developed by KT and used to plan Wibro system analysis. In CellTREK, propagation analysis is performed and that result is represented in 3D viewer. In numerical results, it is showed that the proposed scheme outperforms Modified HATA model when comparing with measurement data.

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Improved Road light Design using Ray-tracing method (광투사 방법을 이용한 가로등 디자인 개선)

  • Choi, Dae-Seub;Han, Jeong-Min;Park, Sung-Tae
    • Proceedings of the KIEE Conference
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    • pp.140-143
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    • 2008
  • In this study, it was studied about the improved road light design for drivers and pedestrians using ray- or reverse ray-tracing method. Many of conventional road lights are not suitable for drivers and pedestrians because it has some serious problems such as glare effect or randomicity of illuminated areas. It was oriented from customary design method which was pointed at simple target such as luminance or electrical power. But it was not truth any more that the high luminance or electrical power consumption mean more bright and good mad light. We studied ray-tracing method for road light reflector design to get the several goals. It means that good road light has easy for drivers and Pedestrians eyes and illuminating objects on the road clearly. So, we set the design targets such as uniformity on the road area per one road light, shading angles and continuous luminance uniformity on the long distance road. We designed ideal road light conditions using ray-tracing method. We set the height of drivers and pedestrians eyes and calculated design guideline to make above design targets. Then we designed road light reflector using reverse ray-tracing method. And we achieved same luminance on the road almost half power consumption because we reduced loss of light. We achieved ideal design guide as 75 degrees of shading angles and 0.5 of luminance uniformity on the road area. Finally, we suggested reflector design for 250 watts power consumption CDM light source.

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Design of Spherical Aberration Free Aspherical Lens by Use of Ray Reverse Tracing Method (광선 역추적 방식을 이용한 구면수차 제거 비구면 렌즈의 설계)

  • 김한섭;박규열;이원규;전종업
    • Journal of the Korean Society for Precision Engineering
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    • v.20 no.10
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    • pp.191-198
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    • 2003
  • In this study, aberration free aspherical lens design method named ray reverse tracing method is introduced. Differently from the traditional design method, the ray reverse tracing method traces the shape and location of a real object by use of its virtual image. From the result, especially spherical aberration free aspherical lens could be designed by use of the ray reverse tracing method. Furthermore, it could reduce the degree of dependence of optical characteristics on designer's ability, because deformation terms and optimization can be eliminated, which has been performed in conventional lens design process.

Aspherical Lens Design by using Ray Reverse Tracing Method (광선 역추적 방식을 이용한 비구면 렌즈의 설계)

  • Kim, Han-Seob;Park, Kyu-Yeol
    • Proceedings of the KSME Conference
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    • pp.992-997
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    • 2003
  • Aspherical lens design method named ray reverse tracing method is introduced. Differently from the traditional design method, the ray reverse tracing method traces the shape and location of a real object by use of its virtual image. From the result, it was convinced that spherical aberration free aspherical lens could be designed by use of the ray reverse tracing method. Furthermore, it could reduce the degree of dependence of optical characteristics on designer's ability, because deformation terms and optimization can be eliminated, which has been performed in conventional lens design process.

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A Study on Ray Tracing Method for Wave Propagation Prediction with Acceleration Methods (가속 방법을 이용하는 전파 광선 추적법에 관한 연구)

  • Kwon, Se-Woong;Moon, Hyun-Wook;Oh, Jae-Rim;Lim, Jae-Woo;Bae, Seok-Hee;Kim, Young-Gyu;Park, Joung-Soo;Yoon, Young-Joong
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.20 no.5
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    • pp.471-479
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    • 2009
  • In this paper, we proposed an improved ray tracing method with an amelioration of visible tree structure, a visible face determination method, and non-uniform random test point method. In a proposed visible tree structure, it reduces tree nodes by means of merging similar nodes. In a visible face determination method, it shows that a ray hit test with a packet ray method can reduce a test time. A ray tracing method involving with a packet ray hit test method can improve a tree construction time up to 3.3 times than a ray tracing method with a single ray hit test method. Furthermore, by seeding a non-uniform and random test point on a face, tree construction time is improved up to 1.11 times. Received powers from the proposed ray tracing results and measured results have good agreement with 1.9 dB RMS error.

Implementation of Ray Tracing Processor for the Parallel Processing (병렬처리를 위한 고속 Ray Tracing 프로세서의 설계)

  • Choe, Gyu-Yeol;Jeong, Deok-Jin
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.48 no.5
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    • pp.636-642
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    • 1999
  • The synthesis of the 3D images is the most important part of the virtual reality. The ray tracing is the best method for reality in the 3D graphics. But the ray tracing requires long computation time for the synthesis of the 3D images. So, we implement the ray tracing with software and hardware. Specially we design the hit-test unit with FPGA tool for the ray tracing. Hit-test unit is a very important part of ray tracing to improve the speed. In this paper, we proposed a new hit-test algorithm and apply the parallel architecture for hit-test unit to improve the speed. We optimized the arithmetic unit because the critical path of hit-test unit is in the multiplication part. We used the booth algorithm and the baugh-wooley algorithm to reduce the partial product and adapted the CSA and CLA to improve the efficiency of the partial product addition. Our new Ray tracing processor can produce the image about 512ms/F and can be adapted to real-time application with only 10 parallel processors.

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Seismic Tomography using Graph Theoretical Ray Tracing

  • Keehm, Young-Seuk;Baag, Chang-Eob;Lee, Jung-Mo
    • International Union of Geodesy and Geophysics Korean Journal of Geophysical Research
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    • v.25 no.1
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    • pp.23-34
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    • 1997
  • Seismic tomography using the graph theoretical method of ray tracing is performed in two synthetic data sets with laterally varying velocity structures. The straight-ray tomography shows so poor results in imaging the laterally varying velocity structure that the ray-traced tomographic techniques should be used. Conventional ray tracing methods have serious drawbacks, i.e. problems of convergence and local minima, when they are applied to seismic tomography. The graph theretical method finds good approximated raypaths in rapidly varying media even in shadow zones, where shooting methods meet with convergence problems. The graph theoretical method ensures the globally minimal traveltime raypath while bending methods often cause local minima problems. Especially, the graph theoretical method is efficient in case that many sources and receivers exist, since it can find the traveltimes and corresponding raypaths to all receivers from a specific source at one time. Moreover, the algorithm of graph theoretical method is easily applicable to the ray tracing in anisotropic media, and even to the three dimensional case. Among the row-active inversion techniques, the conjugate gradient (CG) method is used because of fast convergence and high efficiency. The iterative sequence of the ray tracing by the graph theoretical method and the inversion by the CG method is an efficient and robust algorithm for seismic tomography in laterally varying velocity structures.

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