녹지구성 인자로써 라벤더(Lavandula angustifolia cv.Hidcote)와 잔디(Zoysia japonica Steud.)의 치유적 효과

Iwasaki Yutaka,김유영,조태동 한국환경과학회 2012 한국환경과학회지 Vol.21 No.12

This study has been carried out to verify curative effect of lavender and lawn, a green space composition factor. Thus, the physiological index value of blood pressure, heart rate and salivary amylase were measured with object of 16 women in their 20~30s for stress relaxation effect at lavender garden and lawn square, and impression assessment upon SD method as for psychological value was performed in this study. And a survey was conducted on necessity and reason of urban green space with object of 345 men and women urban workers. As a result of variance analysis between groups and multi test of Turkey upon object place, the blood pressure was lowered the same at lavender garden and lawn square, and especially, high blood pressure was greatly lowered to 30 mmHG at lavender garden. On the other hand, low blood pressure group showed the tendency of a little increasing at the same places. And for the pulse, there was difference between high blood pressure group and normal group at the same places. To conclude, at lavender garden and lawn square the blood pressure was made to be lowered when it's high, and when it's low, the effect of returning to sound status, the function of increasing, was verified. In case of impression assessment upon SD method, the lawn square was assessed as resting place and lavender garden diversional place. And over 90% of urban workers responded to the green space's necessity and curative effect, diversion and resting place were adopted for the reason in high ranking items. As above the green space pattern that urban workers require and curative effect of lavender garden and lawn square were verified. Therefore, the functional green space plan is required, which curative effect, diversion and resting place are considered, for the future green space plan design.

An efficient six-node plate bending hybrid/mixed element based on mindlin/reissner plate theory

Mei, Duan,Miyamoto, Yutaka,Iwasaki, Shoji,Deto, Hideaki,Zhou, Benkuan Techno-Press 1997 Structural Engineering and Mechanics, An Int'l Jou Vol.5 No.1

A new efficient hybrid/mixed thin~moderately thick plate bending element with 6-node (HM6-14) is formulated based on the Reissner-Mindlin plate bending theory. The convergence of this element is proved by error estimate theories and verified by patch test respectively. Numerical studies on such an element as HM6-14 demonstrate that it has remarkable convergence, invariability to geometric distorted mesh situations, to axial rotations, and to node positions, and no "locking" phenomenon in thin plate limit. The present element is suitable to many kinds of shape and thin~moderately thick plate bending problems. Further, in comparison with original hybrid/mixed plate bending element HP4, the present element yields an improvement of solutions. Therefore, it is an efficient element and suitable for the development of adaptive multi-field finite element method (FEM).

色と色名のイメ一ジにみる日本人と植物との關わりに關する硏究

증전견자 ( Kinuko Masuda ),암기관 ( Yutaka Iwasaki ) 한국녹지환경디자인학회 2007 녹지환경학회지 Vol.3 No.3

This study analyzed the images of the colors and the color names derived from some plants, to understand the relationship between people and plants in the Japanese living environment. The results of surveys on images of 20 color names revealed, for example, that many subjects associated “midori” in connection with their surroundings with “natural” and “plant” but few subjects associated “midori” with “artificial”. On the other hand, some subjects did associate “green” with “artificial”. The subjects who associated “green” with “artificial” were urban rather than rural residents. The results of surveys on images of 6 colors (3 color systems) revealed that there are two patterns in the relationship images of colors and color names derived from plants. In the pattern which images of colors are connected with artificial things irrelevant to plants such as “cosmetics” and “clothes”, the color names are confused with the two similar colors. On the other hand, in the pattern which images of the two similar colors derived from plants oppose each other such as “nature-art” and “plants-plastics”, the two similar colors are distinguished by their color names. In both patterns, images of colors derived from plants are influenced by artificial things. These surveys suggest that images of colors derived from plants are influenced by artificial things, and that there are few opportunities to see colors of plants which are full of variety. These results suggest that it is necessary to recognize colors derived from plants in relation to plants, and to educate regarding the nature of plants.

Conclusions and Suggestions on Low-Dose and Low-Dose Rate Radiation Risk Estimation Methodology

Sakai, Kazuo,Yamada, Yutaka,Yoshida, Kazuo,Yoshinaga, Shinji,Sato, Kaoru,Ogata, Hiromitsu,Iwasaki, Toshiyasu,Kudo, Shin'ichi,Asada, Yasuki,Kawaguchi, Isao,Haeno, Hiroshi,Sasaki, Michiya The Korean Association for Radiation Protection 2021 방사선방어학회지 Vol.46 No.1

Background: For radiological protection and control, the International Commission on Radiological Protection (ICRP) provides the nominal risk coefficients related to radiation exposure, which can be extrapolated using the excess relative risk and excess absolute risk obtained from the Life Span Study of atomic bomb survivors in Hiroshima and Nagasaki with the dose and dose-rate effectiveness factor (DDREF). Materials and Methods: Since it is impossible to directly estimate the radiation risk at doses less than approximately 100 mSv only from epidemiological knowledge and data, support from radiation biology is absolutely imperative, and thus, several national and international bodies have advocated the importance of bridging knowledge between biology and epidemiology. Because of the accident at the Tokyo Electric Power Company (TEPCO)'s Fukushima Daiichi Nuclear Power Station in 2011, the exposure of the public to radiation has become a major concern and it was considered that the estimation of radiation risk should be more realistic to cope with the prevailing radiation exposure situation. Results and Discussion: To discuss the issues from wide aspects related to radiological protection, and to realize bridging knowledge between biology and epidemiology, we have established a research group to develop low-dose and low-dose-rate radiation risk estimation methodology, with the permission of the Japan Health Physics Society. Conclusion: The aim of the research group was to clarify the current situation and issues related to the risk estimation of low-dose and low-dose-rate radiation exposure from the viewpoints of different research fields, such as epidemiology, biology, modeling, and dosimetry, to identify a future strategy and roadmap to elucidate a more realistic estimation of risk against low-dose and low-dose-rate radiation exposure.

Study on strength of reinforced concrete filled circular steel tubular columns

Hua, Wei,Wang, Hai-Jun,Hasegawa, Akira,Shioi, Yukitake,Iwasaki, Shoji,Miyamoto, Yutaka Techno-Press 2005 Structural Engineering and Mechanics, An Int'l Jou Vol.19 No.6

Concrete filled steel tubular columns (CFT) are widely used in civil engineering works, especially in large scale of works because of high strength, deformation, toughness and so on. On the other hand, as a kind of strengthening measure for seriously damaged reinforced concrete piers of viaduct in Hansin-Awaji earthquake of Japan in 1995, reinforced concrete piers were wrapped with steel plate. Then, a new kind of structure appeared, that is, reinforced concrete filled steel tubular column (RCFT). In this paper, compression test and bending-shearing test on RCFT are carried out. The main parameters of experiments are (1) strength of concrete, (2) steel tube with or without rib, (3) width-thickness ratio and (4) arrangement of reinforcing bars. According to the experimental results, the effect of parameters on mechanical characteristics of RCFT is analyzed clearly. At the same time, strength evaluation formula for RCFT column is proposed and tested by experimental results and existed recommendations (AIJ 1997). The strength calculated by the proposal formula is in good agreement with test result. As a result, the proposed evaluation formula can evaluate the strength of RCFT column properly.

Study on strength of reinforced concrete filled circular steel tubular columns

Hai-Jun Wang,Akira Hasegawa,Wei Hua,Yukitake Shioi,Shoji Iwasaki,Yutaka Miyamoto 국제구조공학회 2005 Structural Engineering and Mechanics, An Int'l Jou Vol.19 No.6

Concrete filed steel tubular columns (CFT) are widely used in civil engineering works,especially in large scale of works because of high strength, deformation, toughness and so on. On thein Hansin-Awaji earthquake of Japan in 1995, reinforced concrete piers were wrapped with steel plate.Then, a new kind of structure appeared, that is, reinforced concrete filed steel tubular column (RCFT). Inthis paper, compresion test and bending-shearing test on RCFT are carried out. The main parameters of(4) arrangement of reinforcing bars. According to the experimental results, the effect of parameters onmechanical characteristics of RCFT is analyzed clearly. At the same time, strength evaluation formula forRCFT column is proposed and tested by experimental results and existed recommendations (AIJ 197).proposed evaluation formula can evaluate the strength of RCFT column properly.