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뇌파 분석을 통한 LED조명의 색온도와 조도가 집중도와 이완도에 미치는 영향 분석
신지예(Ji-Yea Shin),천성용(Sung-Yong Chun),이찬수(Chan-Su Lee) 한국조명·전기설비학회 2013 조명·전기설비학회논문지 Vol.27 No.5
Preferred combinations of illuminance and color temperature of lighting depend on daily living activities. We investigated whether the illumination stimuli of LED lighting can enhance attention and relaxation level by controlling color temperature and illuminance level according to activities. Illuminations and color temperatures of LED flat panels are controlled in accordance with activities such as office work and resting. The attention and relaxation level under the task specific lightings are compared with those under normal lighting condition. Single channel EEG signals from the NeuroSky’s Mindset are used to estimate attention and relaxation level of human subjects under different lighting conditions. Experiment results show that high color temperature with high illuminance of LED lightings (6600K, 800lx) shows improved attention level compared with conventional lighting conditions (4000K, 500lx).
천성용(Sung-Yong Chun),신지예(Ji-Yea Shin),박신원(Shin-Won Park),이화조(Hwa-Cho Yi),이찬수(Chan-Su Lee) 한국조명·전기설비학회 2012 조명·전기설비학회논문지 Vol.26 No.9
In this paper, we present a new lighting control method considering ambient light in addition to the required lighting illumination for efficient energy saving of a LED stand. We estimate accurate environmental illuminance using a cheap illuminance sensor by modeling measured- and actualilluminance using quadratic polynomial approximation. The relation between PWM(Pulse Width Modulation) duty ratio and illuminance intensity is modeled by a linear model. Illumination of the LED stand is controlled by estimating the difference of required illumination and the estimated ambient illumination. The developed LED stand has reduced electric energy consumption compared with a conventional manually controlled LED stand with the same lighting source. In addition, human subject evaluation shows that the LED stand, which is applied the proposed method, is more satisfactory than conventional ones since the proposed automatic controlled illumination produce more accurately required lighting and it is convenient.