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Author (up) Laurìa, A.; Secchi, S.; Vessella, L. url  doi
openurl 
  Title Visual wayfinding for partially sighted pedestrians – The use of luminance contrast in outdoor pavings Type Journal Article
  Year 2018 Publication Lighting Research & Technology Abbreviated Journal Lighting Research & Technology  
  Volume in press Issue Pages in press  
  Keywords Lighting  
  Abstract An increase in the number of partially sighted people is one of the effects of population ageing. These people have great difficulties in gathering wayfinding information to move independently in an unfamiliar environment. Guide paths based on the luminance contrast between a strip and surrounding surfaces can be an effective device for mitigating these difficulties, but information provided by the scientific literature on guide paths cannot be usefully applied to the naturally coloured paving materials most commonly found in pedestrian urban spaces. This paper presents a simplified method for measuring the luminance contrast between a guide strip and its background using combinations of naturally coloured paving materials.  
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  Series Volume Series Issue Edition  
  ISSN 1477-1535 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number GFZ @ kyba @ Serial 1980  
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Author (up) Lee, H. url  doi
openurl 
  Title Do We Use Artificial Light Appropriately? Type Journal Article
  Year 2018 Publication Psychiatry Investigation Abbreviated Journal  
  Volume 15 Issue 12 Pages  
  Keywords Commentary; Human Health  
  Abstract  
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  Area Expedition Conference  
  Notes Approved no  
  Call Number IDA @ intern @ Serial 2314  
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Author (up) Lee, S-H.; Lim, H-S. url  openurl
  Title A Study on Sky Light Pollution based on Sky Glow in Jeju Island Type Journal Article
  Year 2018 Publication Journal of the Architectural Institute of Korea Abbreviated Journal  
  Volume 34 Issue 4 Pages 83-91  
  Keywords Skyglow  
  Abstract Artificial lighting contributes greatly to developing civilizations. It allows daytime activities to continue throughout the dark hours of the day and thus increasing work productivity as well as allowing people to enjoy nighttime activities. In addition, artificial lighting is used to beautify landscapes, architectural monuments, and thus highlighting the social-economic development of a given place. However, excessive and improper usage of artificial lighting can lead to light pollution. Light pollution is a serious issue that is detrimental to human health. It has been linked to a number of health conditions including sleep disorder, visual discomfort as well as cancer. The effects of light pollution extend throughout the entire ecosystem, affecting both plants and animals. Furthermore, sky-glow from light pollution hinders astronomical observation. The current paper presents a study conducted on lit environment of a nightscape. The quality of the sky was measured in 144 spots using Sky Quality Meter (SQM) devices. The measured spots were chosen on the basis of land use as well as distance from the Halla Mountain.  
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  Notes Approved no  
  Call Number NC @ ehyde3 @ Serial 2105  
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Author (up) Lee, S., Matsumori, K., Nishimura, K., Nishimura, Y., Ikeda, Y., Eto, T., & Higuchi, S. url  doi
openurl 
  Title Melatonin suppression and sleepiness in children exposed to blue-enriched white LED lighting at night Type Journal Article
  Year 2018 Publication Physiological Reports Abbreviated Journal  
  Volume 6 Issue 24 Pages  
  Keywords Human Health  
  Abstract Light-induced melatonin suppression in children is reported to be more sensitive to white light at night than that in adults; however, it is unclear whether it depends on spectral distribution of lighting. In this study, we investigated the effects of different color temperatures of LED lighting on children’s melatonin secretion during the night. Twenty-two healthy children (8.9  2.2 years old) and 20 adults (41.7  4.4 years old) participated in this

study. A between-subjects design with four combinations, including two age

groups (adults and children) and the two color temperature conditions

(3000 K and 6200 K), was used. The experiment was conducted for two consecutive nights. On the first night, saliva samples were collected every hour

under a dim light condition (<30 lx). On the second night, the participants

were exposed to either color temperature condition. Melatonin suppression in

children was greater than that in adults at both 3000 K and 6200 K condition.

The 6200 K condition resulted in greater melatonin suppression than did the

3000 K condition in children (P < 0.05) but not in adults. Subjective sleepiness in children exposed to 6200 K light was significantly lower than that in

children exposed to 3000 K light. In children, blue-enriched LED lighting has

a greater impact on melatonin suppression and it inhibits the increase in

sleepiness during night. Light with a low color temperature is recommended

at night, particularly for children’s sleep and circadian rhythm.
 
  Address  
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  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
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  ISSN ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number IDA @ intern @ Serial 2312  
Permanent link to this record
 

 
Author (up) Lee, S.; Kakitsuba, N.; Katsuura, T. url  doi
openurl 
  Title Do green-blocking glasses enhance the nonvisual effects of white polychromatic light? Type Journal Article
  Year 2018 Publication Journal of Physiological Anthropology Abbreviated Journal J Physiol Anthropol  
  Volume 37 Issue 1 Pages 29  
  Keywords Human Health; Vision  
  Abstract BACKGROUND: It is well known that light containing the blue component stimulates the intrinsically photosensitive retinal ganglion cells (ipRGCs) and plays a role in melatonin suppression and pupillary constriction. In our previous studies, we verified that simultaneous exposure to blue and green light resulted in less pupillary constriction than blue light exposure. Hence, we hypothesized that the nonvisual effects of polychromatic white light might be increased by blocking the green component. Therefore, we conducted an experiment using optical filters that blocked blue or green component and examined the nonvisual effects of these lights on pupillary constriction and electroencephalogram power spectra. METHODS: Ten healthy young males participated in this study. The participant sat on a chair with his eyes facing an integrating sphere. After 10 min of light adaptation, the participant's left eye was exposed to white pulsed light (1000 lx; pulse width 2.5 ms) every 10 s with a blue-blocking glasses, a green-blocking glasses, or control glasses (no lens), and pupillary constriction was measured. Then, after rest for 10 min, the participant was exposed a continuous white light of 1000 lx with a blue- or green-blocking glasses or control glasses and electroencephalogram was measured. RESULTS: Pupillary constriction with the blue-blocking glasses was significantly less than that observed with the green-blocking glasses. Furthermore, pupillary constriction under the green-blocking glasses was significantly greater than that observed with the control glasses. CONCLUSIONS: A reduction in the green component of light facilitated pupillary constriction. Thus, the effects of polychromatic white light containing blue and green components on ipRGCs are apparently increased by removing the green component.  
  Address Graduate School of Engineering, Chiba University, Chiba, Japan  
  Corporate Author Thesis  
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  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1880-6791 ISBN Medium  
  Area Expedition Conference  
  Notes PMID:30563575; PMCID:PMC6299521 Approved no  
  Call Number GFZ @ kyba @ Serial 2153  
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