• Title/Summary/Keyword: 적분구

Search Result 272, Processing Time 0.026 seconds

Development of Two-beam Type integrating Sphere Spectrophotometer and Analysis of its Performance (이중광 적분구형 분광광도계의 제작 및 성능 평가)

  • 정만호;김용완
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
    • /
    • v.13 no.1
    • /
    • pp.15-20
    • /
    • 1999
  • A spectrophotorreter using two-beam type integrating sphere is developed, and the measurerrent accuracy is analyzed. The efficiency of the integrating sphere is analyzed, and the relation between the efficiency and the total measurerrent error is found. Especially, the integrating sphere is fabricated on the basis of its characteristics according to its shape such as the sample port. The perfonnance of the developed spectrophotorreter is tested using a black and a white standard reflectance plate, and the measurerrent error of $\pm0.5%$ is obtained.tained.

  • PDF

Romberg's Integration Using a Systolic Array (Romberg 적분법을 위한 Systolic Array)

  • 박덕원
    • Journal of the Korea Society of Computer and Information
    • /
    • v.3 no.4
    • /
    • pp.55-62
    • /
    • 1998
  • This Paper proposed a systolic Arrays architecture for computing Romberg's integration method. It consists of systolic arrays of two stage, one for integration by Trapezoidal rule and the other for integration by using Richardson's extrapolation. the proposed its architecture is very high speed and regular. This paper illustrates how " mathematical hardware " package, as well as software library routines, may be part of the mathematical problem solver's tool kit in the future.he future.

  • PDF

A Study of The Integrating Sphere for Measurement of Reflectanoe and Transmittance (투과율 및 반사율 측정을 위한 적분구에 관한 연구)

  • Kim, Sang Yeoun
    • Journal of Korean Ophthalmic Optics Society
    • /
    • v.2 no.1
    • /
    • pp.91-95
    • /
    • 1997
  • A General equation is developed for the efficiency of an integrating sphere with a nonuniform coating. The only assumptions are that the interior is a perfect sphere and that all areas reflect perfectly diffusely. The general equation are examined for the basic applications of integrating spheres as mixing mechanisms in hemispherical reflectance measurements and in absolute reflectance techniques.

  • PDF

Three-dimensional Elastic Green's Solution by Formal Time-integration Method (시간적분을 이용한 3차원 탄성파 임펄스 반응 해의 계산)

  • Park Kwon Gyu;Shin Changsoo;Yoon Kwangjin;Suh Jung Hee
    • Geophysics and Geophysical Exploration
    • /
    • v.3 no.4
    • /
    • pp.125-128
    • /
    • 2000
  • An ad hoc method of deriving three-dimensional elastic Greens solution for displacements is proposed in this study; Instead of direct evaluation of four-dimensional Fourier integral that is usual in spectral approaches, we first derived the expression for particle acceleration using the calculus of residues, and then, derived the expression for particle displacement by direct formal integration with respect to time. As a result, we can detour the disconcertion related to causality due to directly evaluating the integral with respect to angular frequency in conventional spectral approach.

  • PDF

Improving the Calculation Speed of Ray-tracing Based Simulator for Analyzing an Integrating Sphere with OpenMP Directive and Guaranteeing the Randomness of Monte Carlo Method (광선추적법 기반의 적분구 분석 시뮬레이터에서 OpenMP 지시어를 이용한 속도 향상 및 몬테카를로 방법의 무작위성 보장)

  • Kim, Seung-Yong;Kim, Dae-Chan;O, Beom-Hoan;Park, Se-Geun;Lee, El-Hang;Lee, Seung-Gol
    • Korean Journal of Optics and Photonics
    • /
    • v.22 no.2
    • /
    • pp.83-89
    • /
    • 2011
  • In order to improve the calculation speed of an integrating-sphere simulator based on a ray-tracing method, parallel processing with OpenMP directive was implemented into the simulator and the randomness of Monte Carlo method was guaranteed by utilizing a parallel random number generator. It was confirmed that simulation results obtained with more than $10^7$ rays showed good agreement with theoretical results within the error range of 0.5%, and that the calculation speed improved as the number of threads increased. Finally, the spatial response distribution functions of a real integrating sphere were simulated and compared with previous results.

Solutions of Integral Equations Related to SPRT for Erlang Distribution (얼랑분포의 축차확률비검정과 관련된 적분 방정식의 해)

  • Lee Eun-Kyung;Na Myung Hwan;Lee Yoon-Dong
    • The Korean Journal of Applied Statistics
    • /
    • v.18 no.1
    • /
    • pp.57-66
    • /
    • 2005
  • In this paper, we propose a method to evaluate the solutions of the renewal equations related to SPRT for Erlang distribution. In SPRT, the Average Sample Number(ASN) and type I or type II error probabilities are shown in Fredholm type integral equations. The integral equations are generally solved by the approximation method using Gaussian quadrature. For Erlang distribution, it has been known that the exact solutions of the equations exist. We propose the algorithm to solve the equations.

The Stress Distribution in a Long Circular Cylinder under a Discontinuous Boundary Conditions on the Curved Surface (곡면상에 불연속경계조건을 간는 원주의 응력분포)

  • Lee, Doo-Sung
    • Transactions of the Korean Society of Mechanical Engineers
    • /
    • v.2 no.2
    • /
    • pp.38-41
    • /
    • 1978
  • 이 논문에서는 표면의 일부에 기지의 압력을 밥는 긴 원주내의 응력분포를 구하는 문제를 고찰하였다. 문제를 혼합경계치조건에서 발생되는 쌍적분방정식의 해를 구하는 문제로 간단히 한후에 제 2종 Fredholm 적분방정식을 해결하는 문제로 하였다. 이 적분방정식의 수직해를 전자계산기에 의하여 구한 다음 도시하였다.

Improvement of Spatial Radiance Uniformity of Small Integrating Spheres (소형 적분구의 공간 복사 휘도 균일도 향상 연구)

  • Yong Shim Yoo;Dong Joo Shin;Bong Hak Kim
    • Korean Journal of Optics and Photonics
    • /
    • v.34 no.5
    • /
    • pp.202-209
    • /
    • 2023
  • A KRISS-type small integrating sphere with a high spatial radiance uniformity was made using pressed polytetrafluoroethylene (PTFE) and a reflective rod to calibrate the spectral radiance responsivity of absolute radiant thermometers. The spatial radiance uniformity of the KRISS-type small integrating sphere was ±0.009%, five times higher than the best value reported by foreign national metrology institutions thus far. In addition, we improved the spatial radiance uniformity of a commercial sintered PTFE integrating sphere by a factor of 10.

A New Simple Technique for View Factor Computation (간단한 복사 형상계수 계산 방법)

  • Cho, S. H.
    • Transactions of the Korean Society of Mechanical Engineers
    • /
    • v.7 no.1
    • /
    • pp.96-102
    • /
    • 1983
  • 복사 형상계수를 계산하는 새롭고도 간단한 수치적 방법이 개발되었다. 유한선분 적분법은 윤 곽적분을 이용하며, 윤곽은 유한한 수의 선분으로 구성된 것으로 가정한다. 미소면적으로부터 유한면적까지의 복사 형상계수는 적분로 상의 절점의 좌표값에만 관계되며, 전자 계산기에 쉽게 프로그램 될 수 있다. 가우스의 적분을 이용하여 두 유한 면적사이의 복사 형상계수를 구한다. 미소 면적에서 원판까지, 두 개의 평행원판 사이, 및 두 개의 직사각형 사이의 복사 형상계수를 구하여 엄밀해와 비교하여 유한선분 적분법의 정확성이 우수함을 보였다. 단위구와 단위 정사 각형에서 타원체까지의 보가 형상계수의 값도 구하였다.

The Measurement Methods of a Large Light Source Using the Integrating Sphere (적분구를 이용한 대형광원의 측정방법)

  • Hwang, Myung-Keun;Lee, Se-Hyun
    • The Transactions of the Korean Institute of Electrical Engineers C
    • /
    • v.54 no.12
    • /
    • pp.585-587
    • /
    • 2005
  • In this paper, We studied two methods to measure optical characteristics of an electrodeless light source using the integrating sphere(diameter 1.5m). One is to use a center measurement method and the other is to use a side measurement method. As a result of analysis, a side measurement methode without auxiliary lamp is almost similar against a center measurement with auxiliary lamp to reduce a measurement of an error for luminous flux, luminous efficacy and spectral distribution etc. Therefore, Sample which cannot measured by reason of big size and heavy weight can be measured by a side measurement method.