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Measurement and Forecast of the Visibility Range according to Illuminance and the Character Sizes

조도와 글자 크기에 따른 가시거리 측정과 예상

  • Kim, Tae-Hyun (Division of Electrical Engineering, School of Information Technology Myongji College)
  • 김태현 (명지전문대 공학정보학부 전기과)
  • Received : 2013.10.24
  • Accepted : 2014.01.09
  • Published : 2014.01.31

Abstract

The visibility range is defined from where one can see. And it can be changed by illuminance, the character size, and eyesight and so on. In this paper the visibility range of 120 students is measured for 4 character sizes and 3 illuminations in a classroom. In order to forecast the visibility range of unmeasured data, using least square approximation theory, functions whose independent variable is illuminance and whose dependent variable is the visibility range is proposed. Because the visibility range is invariant according to illuminance, common logarithmic functions for 4 character sizes are used. The small difference between the postulated functions and the measured data verifies the accuracy of the functions.

가시거리는 무엇인지 정확히 보이는 거리로 정의되며 이는 조도, 글자 크기와 시력 등에 따라 달라진다. 본 논문에서는 4가지 글자 크기와 3가지 조도에 대해서 약 120명의 학생들을 대상으로 교실에서 가시거리를 측정하였다. 측정하지 않은 조도에 대한 가시거리를 예상하기 위해서 최소 제곱 근사 이론을 적용하여 조도가 독립변수이고 가시거리가 종속변수인 함수를 만들었다. 조도가 많이 변해도 가시거리는 조금 밖에 변하지 않으므로 상용로그함수를 이용하여 글자 크기 4가지 각각에 대해서 함수를 만들었다. 만들어진 함수의 값과 측정값과의 오차가 매우 적으므로 함수가 잘 만들어졌음을 보였다.

Keywords

References

  1. In-Ho Choi, Hong-nam Ryu, A study on the effects of emotional lighting in public school, The Proceeding of the Korean Institute of Illuminating and Electrical Installation Engineerings pp.134-139, 2012
  2. Jin-Goo. Kim, Dong-Jo Kim. Hoon Kim, An Investigation & Improvement of Illumination for Analysis Relation between Classroom, Illumination and Variation of Student's Eyesight, Journal of Korean Institute of Illuminating and Electrical Installation Engineering, pp.145-153, 2013
  3. Yong-Sik Shin, Hong-Kyoo Choi, Seung-Won Park, Beom-Gwan Seo, Myung-Hwna Lim, Hye-Young Shin, Improvement of lecture room light by pattern search method, The Proceedings of the Korean Institute of Illumination and Electrical Installation Engeinners, pp89-92, 2008

Cited by

  1. Measurement and Prediction of the Visibility Range by the Variations of the Character Sizes and Illuminance vol.16, pp.12, 2015, https://doi.org/10.5762/KAIS.2015.16.12.8222