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Keynote of Dissertation

Applicant: Norio Abe

This dissertation is composed of three major arguments; “Light Emission Pattern of Firefly and Human’s Sensitivity”, “Creation of Cure Spaces by Utilizing Firefly” and “Science of Firefly Rearing”. More specifically, it begins with physical and mathematical study of light emission of firefly and creation of cure spaces based on the evaluation of light emission of firefly from the viewpoint of Kansei Engineering, and it rounds out with the science of firefly rearing in the hydrosphere environment established by modeling precisely the environment in nature.

I firstly examined the effects of the fluctuating property of the firefly’s light emission pattern on humans, and secondly, suggested and evaluated mini ecosystem from the viewpoint of Kansei Information Measurement and welfare utility. Lastly I developed an argument on science of firefly rearing that we newly developed, in line with each thesis accordingly.

In the first phase of this study, I focused on the healing effect of natural environment. Itook up the firefly (the light emission and its hydrosphere environment from the viewpoint of ecosystem) as one of the healing factor, which keeps fascinating the heart of Japanese with its fantastic light, as a part of Japanese nature’s bounty. Then I studied experimentally the mysterious light and humans’ sensitivity, and examined whether it causes human spirit any effect or not.

I measured and analyzed luminescence phenomenon by using technological application such as image data processing and statistical processing, in consideration of creation of healing spaces with fireflies and mini ecosystem for hospices and welfare facilities, and I also evaluated fluctuating property and fractal dimension, which are found in the light emission pattern of firefly.

At the same time, I evaluated the effect of firefly’s light on human spirits by using sensory evaluation method through the viewpoint of Kansei Engineering. However, these measurements covered only one side of bioinformatics given by the light emission pattern of firefly, and they do not touch on the other important information, i.e., the hue of light and its fluctuation.

In this study, therefore, I added more detailed consideration of the light of firefly and humans’ sensitivity, by making another approach to examine the fluctuation of the hue of light which was seen in the emission pattern of firefly from the viewpoint of hue psychology and Kansei Information Measurement.

In addition, I examined how color of light and the variation of the hue of light are effective to human’s spirits psychologically. Next, I utilized the virtual firefly illumination system which I developed based on our study of firefly’s light emission pattern and its fluctuation, to examine the nature of artificial mini ecosystem.

At the same time, I aimed at creating cure spaces for hospices and welfare facilities by considering the effect of artificial light on human’s spirits from the viewpoint of Kansei Engineering.

The virtual firefly illumination system which we have newly developed can provide the light imitating that of natural firefly, and it is expected to have the same cure effect with the natural one.

Although natural firefly can be seen only in a certain period of summer, the artificial system can provide the light of firefly and cure effect, whenever and wherever, according to the requests from hospices and welfare facilities.

On the other hand, in this study, I reconstructed hydrosphere environment mainly with firefly in ecological tank at Itabashi Firefly Facility (at Eco-Police Center, Resource and Environment Division, Itabashi Ward Office, Tokyo).

Also I carried on various experimental examinations seeking for succession to the next generations, aiming at regression to natural ecosystem and environment protection.

The information reported in the dissertation includes necessary requirement, most suitable hydrosphere environment, soil environment and thermal environment sufficient for firefly to keep living, and symbiosis with fauna and flora.

Also, it includes simulation of closed mini ecosystem aiming at designing and developing ecosystem for firefly in order to make hydrosphere environment return to natural state, achieving succession of sixteen generations.

It is the evidence of our success in mass rearing, nobody has ever achieved. Moreover, in this study, I additionally created simulated ecosystem at Itabashi Firefly Facility based on our achievement, seeking for more natural ecosystem.

To be more precise, we made the ecological tanks bigger than those we had ever, and examined experimentally more realistic ecological environment. This is our second trial to actualize the scene with fireflies in a state of nature even in urban area. Artificial rearing is far from protection of firefly.

It can be achieved only by having fireflies settled in a state of nature and keeping the elegant luminescence illusion succeeded forever. In the study, I carefully examined perfect ecosystem for firefly and created simulated ecosystem with “Seseragi” (means babbling stream) based on an appropriate model of ecosystem.

Additionally, I asked people with various backgrounds to experience the space and examined the effect of this simulated ecosystem with firefly on human spirit.

Iam planning to advance our technology of firefly rearing learned from the simulated ecosystem and put it into practical use, and utilize the “Seseragi” space as places for education of welfare, emotion and environment. Recently, it is found that some facilities buy fireflies massively for commercial purpose and bring them to remote area where they do not match hereditarily. These situations criate problems ecologically.

However, as the firefly in certain area have died off, it is critical to preserve firefly which are close to the heredity trait of the area, as much as possible. On the other hand, I believe my study described in this dissertation will be able to make a significant contribution to this end.




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