Department of Architecture and Urban Design, Faculty of Human-Environment Studies
Department of Architecture, Graduate School of Human-Environment Studies
Department of Architecture, School of Engineering
Light is indispensable to human beings. Koga Laboratory is working on design, assessment and control of indoor and outdoor luminous environments in terms of environmental physics and human psychology and physiology through visual perception.
Main research topics are solid-state lighting (SSL), daylighting and integrative lighting. In order to present an approach to designing luminous space for comfort and health, we are working on human visual responses to light with different spectral power distributions. Those responses are relevant to visual and non-visual effects of optical radiation. Conventional metrics of light are insufficient to quantify various visual responses and perception through retinal photosensitive cells (rods, cones and intrinsically photosensitive retinal ganglion cells). A key issue is making a model of human nonlinear visual responses. For the healthful building environment, we have launched research on the parametric design process for the building envelope and daylight openings. Past experience of long-term measurement of daylight and solar radiation and development of various daylight models has developed research on a façade system autonomously shading direct sunlight with daylight monitoring. In recent years, we have been working on automotive lighting as well. Issues are glare control for LED head and rear lights and improvement of indoor visual environment.
Besides, we are involved in international standardization activities for indoor visual environment and lighting in buildings. Dr. Koga drafted ISO standards on the spatial distribution of daylight (ISO 15469/CIE S 011) and design process for the indoor visual environment (ISO 16817), and the International Lighting Vocabulary (CIE S 017). We have participated in research projects (tasks) on daylighting in the Solar Heating and Cooling Programme (SHC) of the International Energy Agency (IEA). A new task "Integrated Solutions for Daylight and Electric Lighting" will start in 2018.
Assoc.Prof. Yasuko Koga