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Volume 46 (2009)
- Issue 4 Pages 99-
- Issue 2 Pages 59-
- Issue 1 Pages 3-
Volume 46, Issue 2
Displaying 1-3 of 3 articles from this issue
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Original Articles
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Yukitaka Ohashi, Hiroshi Ryumon, Yoshinori Shigeta2009 Volume 46 Issue 2 Pages 59-68
Published: 2009
Released on J-STAGE: June 27, 2009
JOURNAL FREE ACCESSVarious human living and sport activity spaces exist in an urban area, where people are active daily there. The incidence of heat disorder is strongly affected by the micro-meteorological conditions at the spaces. Our study clarified the difference in wet-bulb globe temperature (WBGT), which is used as a representative heat disorder index, among the spaces: playground, gymnasium (indoor), athletic track, grass square, street of office buildings, and residential street. The differences of the daily maximum WBGT among these appeared with maximum values of 4.0°C between the athletic track and the gymnasium for all the spaces, and 3.4°C between the athletic track and the street of office buildings for outdoor spaces. The results were mainly attributed to the globe-temperature differences; these relate to the radiation environments to human bodies at spaces. The above WBGT difference among the human activity spaces cannot be quantitatively neglected from the view point of the risk of heat disorder. Therefore, it should be paid attention to that the WBGT is estimated from only dry- and wet-bulb temperatures (i.e., without globe temperature).
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—A case of Cheong-Gye Stream in Seoul, South Korea—Futoshi Matsumoto, Toshiaki Ichinose, Youhei Shiraki, Lyong-Tae Lee2009 Volume 46 Issue 2 Pages 69-80
Published: 2009
Released on J-STAGE: June 27, 2009
JOURNAL FREE ACCESSThe objective of this study is to clarify the cooling effect by the ventilation after the restoration of the river in a inland city. The meteorological observations were carried out around the Cheong-Gye Stream in Seoul city in summer, 2006 (after the restoration process).
The main results are summarized as follows:
(1) When the wind from westward along the Cheong-Gye Stream is strong, the wind flows separating into the crossing avenues toward south and north. At the same time, it supplies decrease in temperature to the crossing avenues.
(2) The decrease in mean temperature in hourly is confirmed to reach around 60 m as max value from the restored zone. And it is supposed that the degree of decrease in temperature is about 0.3–0.4°C as the wind velocity increase 1 m/s.
Therefore it is confirmed that the decrease in temperature by the ventilation exists after the restoration of the Cheong-Gye Stream. Then it is considered that a large restoration of the inner-city river is able to be effective for urban development.
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Akane Shimazaki, Osamu Kashimura, Kazuhiro Minami, Tomoya Kashiwagi, H ...2009 Volume 46 Issue 2 Pages 81-90
Published: 2009
Released on J-STAGE: June 27, 2009
JOURNAL FREE ACCESSThe purpose of this study was to examine the physiological effects of trekking and appreciation of landscape in Oze National Park. The subjects were 12 healthy men at old and middle age (53±5 yr). The measured physiological parameters were the R-R intervals of the electrocardiogram to analyze heart rate variability. The energy expenditure by Oze trekking was 905 kcal, and the volume of physical exercise calculated from METS that was 30.3 “exercise”. The “Ushikubi” point, the powers of the high frequency component tended to be higher and low frequency to high frequency ratio tended to be lower. The physiological responses suggested that sympathetic nervous activities were suppressed and parasympathetic nervous activities were enhanced in Oze area, and Ushikubi was particularly responsible for reducing the stress. In conclusion, the present study has proved life-style related diseases, the relaxing and stress-relieving effects of Oze by means of a physiological investigation.
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