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( Mikiya Araki ),( Kotaro Oki ),( Takashi Onishi ),( Seiichi Shiga ) 한국액체미립화학회 2013 한국액체미립화학회 학술강연회 논문집 Vol.2013 No.-
Feasibility of a newly developed non-intrusive particle size measurement method in sub-micron region using multi-wavelength polarized lights is investigated, experimentally. Figure 1 shows the optical setup. Polystyrene particles are used as the test particles, which are suspended in purified water. The arithmetic mean diameters of them are varied from 0.356 to 3.00 μm, which are previously measured with a conventional method (centrifugal sedimentation method). The laser beam passes through the test particles, and the scattered lights are acquired with a digital CCD camera set in parallel and perpendicular directions to the polarization plane of the incident light. Based on the Mie`s scattering theory, the ratio of scattered lights for these two components is given as a function of the particle diameter, the refractive index, and the wavelength of the incident light. By comparing the polarization ratio calculated analytically with those obtained experimentally, the particle size can be determined, which is called polarization ratio method. The major drawback of this method is the narrow measurement range, typically up to the order of 0.1 μm, which is attributed to the complicated behavior of the polarization ratio in the Mie scattering region. In order to extend the measurement range of conventional polarization ratio methods, three kinds of He-Ne lasers, whose wavelengths are 543.5, 594.1, and 632.8 nm, are used. The polarization ratios of the scattered lights are obtained from these scattered light images, and the acquired data are compared with the analytical values. Figure 2 shows the data comparison with a conventional method. It is shown that, by use of the multiwavelength polarization ratio method, the measurement range of the particle size can be extended up to the order of 3 μm, and that the accuracy of the results lies from 0.1 % to 7.6 %, when compared with the results of a centrifugal sedimentation method.
A Survey Among Wheelchair Users Who Participated in Banie Free 2010 Trade Show
Toru Furui,Haruka Onishi,Masahiro Kagatanj,Sayaka Sako,Kensuke Hiramoto,Rie Yonezawa,Takashi Handa,Minoru Tanaka 한국재활복지공학회 2010 한국재활복지공학회 학술대회논문집 Vol.2010 No.11
Objectives of this study is to explore factors impacting their pain and discomfort, and to advocate seating ergonomics in public. We set up a seating clinic booth and conducted survey among wheelchair users at Barrie Free 2010 Trade Show held at Intec Osaka from April 15th to April 17<SUP>th</SUP> 2010.Weanalyzedtheseated posture using software "Rysis", which designed based on ISO 16840-1. Results showed pelvis and trunk asymmetry, joystick controller side, and neck pain made impact on their seated posture. With this clinical consultation process of this work, users can satisfy their interest in objective findings of their seated posture, and experience the importance of ergonomic seating.
이진아(Lee Jin-a),오오니시타카시(Onishi Takashi),조주현(Cho Joo-Hyun) 대한국토·도시계획학회 2001 國土計劃 Vol.36 No.5
Private Finance Initiative(PFI) was introduced in Japan in July 1999 in order to reform public investments and to encourage private sector to finance, manage and utilize their technical expertise in construction, maintenance and operation of public facilities. The primary objective of all PFI schemes is to achieve better Value for Money(VFM) in the delivery of public services. VFM is maximized in PFI when more risk is allocated to the party that can manage it efficiently. This paper is based on the Kanamachi PFI Mode Project which is the first PFI project in Japan and aims to evaluate its VFM. Also it aims to estimate the impact of risks that are to be burden by the public sector using Monte Carlo simulation. The result of this analysis shows positive VFM which, however, falls short of 5 percents as has been expected by Tokyo Government. As the magnitude of VFM is affected ny the level of public expenditure, more study on optimal allocation of risk between public and private is needed.