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- 저자 : Yuko Hirota (검색결과 2 건)
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ALMA BAND 8 CONTINUUM EMISSION FROM ORION SOURCE I
Hirota, Tomoya,Machida, Masahiro N.,Matsushita, Yuko,Motogi, Kazuhito,Matsumoto, Naoko,Kim, Mi Kyoung,Burns, Ross A.,Honma, Mareki American Astronomical Society 2016 The Astrophysical journal Vol.833 No.2
<P>We have measured continuum flux densities of a high-mass protostar candidate, a radio source. I in the Orion. KL region (Orion Source I) using the Atacama Large Millimeter/Submillimeter Array (ALMA) at band. 8 with an angular resolution of 0 ''.1. The continuum emission at 430, 460, and 490 GHz associated with Source. I shows an elongated structure along the northwest-southeast direction perpendicular to the so-called low-velocity bipolar outflow. The deconvolved size of the continuum source, 90 au x 20 au, is consistent with those reported previously at other millimeter/submillimeter wavelengths. The flux density can be well fitted to the optically thick blackbody spectral energy distribution, and the brightness temperature is evaluated to be 700-800 K. It is much lower than that in the case of proton-electron or H-free-free radiations. Our data are consistent with the latest ALMA results by Plambeck & Wright, in which the continuum emission was proposed to arise from the edge-on circumstellar disk via thermal dust emission, unless the continuum source consists of an unresolved structure with a smaller beam filling factor.</P>
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Mori Mori,Sadao Horino,Yuji Inomata,Hiroki Sasayama,Yuko Hirota 대한인간공학회 2007 대한인간공학회 학술대회논문집 Vol.- No.-
In Japan, Quarter-million crossing collisions at intersections accounted for one-fourth of the total accidents in 2005. Three-fourths of collisions took place at urban intersections, more than half of them occurred at uncontrolled intersections. Risks of crossing collisions depend on the quality of visual environment at intersection. This study aimed to assess the legibility and effectiveness of 23 traffic convex mirrors installed at 10 urban intersections, after the road management authority inspected and repaired. The legibility of mirror was assessed by means of the photographs of each mirror taken from the drivers’ viewpoint at a legal stop line, entering from the lower priority direction. “Three ergonomics requirements” suggested by the authors were used as the criteria of legibility assessment; (1) Position of road lane, (2) Blind area and (3) Road surface markings. Combining these 3 criteria, the comprehensive assessment of mirror was indicated in 2-grade scale, such as “Good” or “Poor”, namely so dangerous to be improved. A field assessment revealed that 11 among 23 mirrors were still improperly installed. However, simulation analysis showed that 7 among 11 poor mirrors could be improved by adjusting the angle of mirror plate or displacing mirror plate/poles. In conclusion, the present official guideline in regard with installing mirror should be revised to add newly “three ergonomics requirements” for preventive safety. Application of these new guidelines in practice, a typical low-cost and low technology-oriented improvement to reduce crossing collisions, was highly recommended.
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