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Measurement and Prediction of the Visibility Range by the Variations of the Character Sizes and Illuminance
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 Title & Authors
Measurement and Prediction of the Visibility Range by the Variations of the Character Sizes and Illuminance
Kim, Tae-Hyun;
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The visibility range is defined from where one can see, which can be changed by the character sizes and illuminances and so on, which of one-hundred and twelve students are measured for three illuminances and three character sizes in this paper. In determining the character sizes and illuminances, the visibility range can be an important data. Functions are proposed whose independent variable is illuminance and whose dependent variable is visibility range in order to predict the visibility range of unmeasured illuminances. The fractional functions are used for three character sizes because the visibility range is invariant according to illuminance. There are three parameters to be determined - k, m, n, which are selected based on the measured visibility ranges. Because the visibility ranges of three character sizes are measured, three k`s can be calculated. In this paper the case of minimum variance of three k`s is selected, and three parameters - k,m,n- of that case is selected. The three functions according to three character sizes are proposed. The small differences between the measured data and the postulated functions verifies the accuracy of the functions.
Character Sizes;Fractional Function;Minimum Variance;Illuminance;Visibility Range;
 Cited by
In-Ho Choi, Hong-nam Ryu, "A Study on The Effects of Emotional Lighting in Public School", KIIEE Annual Spring Conference, pp. 134-139, May, 2012.

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 ", KIIEE Annual Autumn Conference, pp. 145-153, November, 2003.

Yong-Sik Shim, Hong-Kyu Choi, Seung-Won Park, Beom-Gwan Seo, Myung-Hwan Lim, Hye-Yong Shin, "Improvement of Lecture Room Light by Pattern Search Method" KIIEE Annual Autumn Conference, pp. 89-92, October, 2008.

Tae-Hyun Kim, "Measurement and Forecast of the Visibility Range according to Illuminance and Character sizes" Journal of The Korean Academia-Industrial cooperation Society, Vol 15, No 1, pp. 425-429, January, 2014. DOI: crossref(new window)