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RISS 인기검색어
- 검색키워드
- 저자 : ( Nooree Na ) (검색결과 6 건)
- 무료
- 기관 내 무료
- 유료
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Smartphone Use at Night Affects Melatonin Secretion, Body Temperature, and Heart Rate
Na, Nooree,Choi, Hojun,Jeong, Kyeong Ah,Choi, Kyungah,Choi, Kyungsun,Choi, Chulhee,Suk, Hyeon-Jeong Korean Society for Emotion and Sensibility 2017 감성과학 Vol.20 No.4
In the present study, we investigated the physiological effects of smartphone use at night when the display luminance and white balance were differently manipulated. Two levels of luminance and two types of white balance were combined to form four types of displays. Subjects were instructed to use smartphones between 23:00 to 01:00 twice a week for two weeks, and for each trial, subjects were given one of the four display types. Melatonin concentration in the saliva, body temperature and heart rate were measured before and after each experiment. The experimental result showed that the low luminance display supported melatonin secretion and thermoregulation compared to the high luminance display. With regard to the white balance, higher melatonin level was observed when using the display that filtered blue light. The low luminance display together with yellowish tint best supported restful sleep at night in terms of every physiological response. This study collectively demonstrates that bright and blue light emitted from smartphone displays adversely affect melatonin secretion, body temperature, and heart rate, and therefore, suggests the use of a display with low luminance or a display that filters blue light for a restful sleep at night.
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Adaptive display luminance for viewing smartphones under low illuminance.
Na, Nooree,Suk, Hyeon-Jeong Optical Society of America 2015 Optics express Vol.23 No.13
<P>The study investigates the optimal display luminance for viewing smartphones in conditions of low illuminance. This proposes a model of adaptive display in that display luminance changes gradually with the passage of watching time. It starts at a fairly low display luminance of 10 cd/m2, and after 10 seconds, the luminance increases slowly until it reaches 40 cd/m2 for 20 seconds and maintains the luminance. For the development of the model, an experiment was conducted to identify the optimal luminance for initial viewing and that for continuous viewing, as well as the change speed of display luminance. In order to validate the model, users' subjective judgments and activation of alpha rhythm were observed, and the result confirmed the superiority of the adaptive display luminance compared to the current display luminance in terms of physiological comfort and psychological satisfaction. It is expected that this study contributes to the pleasing use of displays at night under low illuminance by applying to diverse types of display devices.</P>
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Smartphone Use at Night Affects Melatonin Secretion, Body Temperature, and Heart Rate
( Nooree Na ),( Hojun Choi ),( Kyeong Ah Jeong ),( Kyungah Choi ),( Kyungsun Choi ),( Chulhee Choi ),( Hyeon-jeong Suk ) 한국감성과학회 2017 감성과학 Vol.20 No.4
In the present study, we investigated the physiological effects of smartphone use at night when the display luminance and white balance were differently manipulated. Two levels of luminance and two types of white balance were combined to form four types of displays. Subjects were instructed to use smartphones between 23:00 to 01:00 twice a week for two weeks, and for each trial, subjects were given one of the four display types. Melatonin concentration in the saliva, body temperature and heart rate were measured before and after each experiment. The experimental result showed that the low luminance display supported melatonin secretion and thermoregulation compared to the high luminance display. With regard to the white balance, higher melatonin level was observed when using the display that filtered blue light. The low luminance display together with yellowish tint best supported restful sleep at night in terms of every physiological response. This study collectively demonstrates that bright and blue light emitted from smartphone displays adversely affect melatonin secretion, body temperature, and heart rate, and therefore, suggests the use of a display with low luminance or a display that filters blue light for a restful sleep at night.
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Optimal RGB ratio for Nighttime Smartphone Users
( Nooree Na ),( Hyeon Jeong Suk ) 한국감성과학회 2015 추계학술대회 Vol.2015 No.-
The study explored the optimal display color for comfortable use of smartphones particularly under low illuminance such as at night. It attempted to achieve the visual comfort while not distorting the aesthetic quality of display color. Three psychophysical experiments were conducted focusing on following conditions: 1) black texts againstwhite background; 2) black text and natural color imageagainst white background; 3) color video clips. In each experiment, subjects judged acceptability of various shades of white as background color. The experimental results indicated that the acceptable threshold of a text-based content was consistent with that of a text and image-based content, corresponding to the RGB values of 255, 255, and 230. However, the acceptable threshold of a video-based content observed as the RGB values of 255, 255, and 165. Accordingly, the RGB values of 255, 255, and 200 were proposed as the optimal RGB ratio, since it is the average value of the two different acceptable threshold. Moreover, the proposed ratio also contributes to reduce the energy consumption up to 25 %. The presentation demonstrates how the physiological comfort is empirically validated.
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백색 제품의 Color, Material, Finishing (CMF) 특성에 따른 감성 이미지 연구
나누리(Nooree Na),석현정(Hyeon-Jeong Suk) 한국색채학회 2012 한국색채학회 학술대회 Vol.2012 No.11
본 연구에서는 제품 디자인에서 중요한 요소인 색상과 톤, 광택, 거칠기가 백색 제품의 감성적 특성에 미치는 영향에 대하여 알아보았다. 실험 연구를 통해 3가지 주요 결과를 얻었다. 첫째, 각 요소별 감성 이미지에 미치는 영향력의 크기가 다르다. 색상이 가장 큰 영향을 행사하며, 광택과 거칠기, 톤의 순으로 그 뒤를 따른다. 둘째, 다양한 감성 이미지 각각을 극대화시킬 수 있는 특정한 색상, 톤, 광택, 거칠기 조건이 존재한다. 색상과 톤은 감성 이미지에 따라 조건의 차이가 크지만, 광택과 거칠기는 모든 감성에서 유사하다. 셋째, 감성 이미지에 따라 CMF 요소 간 상호작용 효과가 있는지 여부가 다르다. ‘화려한’과 ‘맑은’ 감성 이미지는 색상의 영향이 매우 큰 관계로 요소 간 상호작용이 존재하지 않지만, ‘우아한’과 ‘부드러운’ 감성 이미지는 CMF 요소 간의 상호작용에 따라 감성이 크게 좌우된다.
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