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Oita, Japan

Nippon Bunri University is a private university in Ōita, Ōita, Japan. The school was established in 1967 and adopted its present name in 1982. Wikipedia.

Uzaki K.-I.,Port and Airport Research Institute | Ikehata Y.,Nippon Bunri University | Matsunaga N.,Kyushu University
Journal of Coastal Research | Year: 2011

The wave absorption performance of a new type of steel floating breakwater with truss (FBT), which is composed of a box-type pontoon and truss structures, has been investigated experimentally. The truss structures are attached to the front and the rear of the pontoon, and exaggerate wave energy dissipation due to wave breaking. Flow visualization has revealed that the front truss breaks the incident waves and effectively converts wave energy to turbulent energy. Image analysis of the motions of the FBT and determination of the transmission coefficient K t showed efficient dissipation of wave energy resulting from the truss structure. K t is also discussed and quantified with the aid of dimensional analysis. Values of K t are plotted against the ratio of the water depth h to the wavelength of incident waves L, and the profiles obtained are normalized by introducing values of h/L at which K t equals 0.5, i.e., (h/L) 0.5. Normalization gives a universal empirical expression for K t, and empirical expressions of (h/L) 0.5 are also obtained by independently changing the shape parameters and the wave steepness. A graphic chart of (h/L) 0.5 is provided so K t of the FBT can be evaluated easily. This data-reduction method developed for the quantification of K t may be applicable for other floating breakwaters as well as for this new type. © 2011, the Coastal Education & Research Foundation (CERF). Source

Yamamoto T.,National Institute of Technology, Miyakonojo College | Inoue M.,Nippon Bunri University
Journal of Structural and Construction Engineering | Year: 2016

A model testing for measuring a drop amount of the volcanic ash from a pitched roof was carried out. This testing indicates that a sliding of volcanic ash on a pitched roof can occur in a huge eruption and an occurrence of the sliding depends on surface roughness of roof material and a shape of surface of thereof An angle of a slope of the volcanic ash depositing on the pitched roof winch is an angle of the slope when the sliding is over can be main factor to understand of the sliding. Source

Yamamoto I.,Nagasaki University | Inagawa N.,Nippon Bunri University | Matsui M.,University of Kitakyushu | Hachisuka K.,University of Occupational and Environmental Health Japan | And 2 more authors.
Bio-Medical Materials and Engineering | Year: 2014

Compact rehabilitation robot system which can support movement of the wrist of patients has been developed. The robot system can detect and analyze the patient's intention to move the wrist by such a biological signal as muscle potential, then, assist the wrist exercise of patients. Also, both-wrist rehabilitation robot system by mirror effect has been successfully developed for practical use in the hospital and at home. © 2014 - IOS Press and the authors. All rights reserved. Source

Ikenoue M.,Ariake National College of Technology | Wada K.,Nippon Bunri University
IEEJ Transactions on Electronics, Information and Systems | Year: 2015

In this paper, the methods of consistent estimation for identification of linear discrete-time system in the presence of input and output noises, which is usually called "errors-in-variables" (EIV) models, are studied. It is well known that the least squares (LS) method gives biased parameter estimates for EIV situations. To solve this bias problem, the instrumental variable (IV) methods and the least correlation (LC) method are often used. The IV and LC based methods can be applied in more general noise conditions, but these methods suffer from poor accuracy of the estimated parameters because the coefficient matrix of these methods may often become ill-conditioned. In order to obtain numerically stable estimates, the methods presented in this paper use the biased extended LC (XLC) estimates. The biased XLC estimates can be defined by using the extended vectors and the pre-filters. According to the bias compensation principle (BCP) technique, the proposed bias-compensated XLC (BCXLC) methods are developed. The way to reduce the computational load is examined. The results of simulated examples indicate that the proposed methods provide numerically stable and good estimates. © 2015 The Institute of Electrical Engineers of Japan. Source

Wall D.P.,Nippon Bunri University | Nagata M.,Tianjin University
Journal of Fluid Mechanics | Year: 2016

Three spatially extended travelling wave exact coherent states, together with one spanwise-localised state, are presented for channel flow. Two of the extended flows are derived by homotopy from solutions to the problem of channel flow subject to a spanwise rotation investigated by Wall & Nagata (J. Fluid Mech., vol. 727, 2013, pp. 523-581). Both these flows are asymmetric with respect to the channel centreplane, and feature streaky structures in streamwise velocity flanked by staggered vortical structures. One of these flows features two streak/vortex systems per spanwise wavelength, while the other features one such system. The former substantially reduces the value of the lowest Reynolds number at which channel flow solutions ,other than the basic flow, are known to exist down to 665. The third flow has, in contrast, half-turn rotational symmetry about a streamwise axis through a point on the channel centreplane, and is found to be the flow from which one of the asymmetric flows bifurcates in a symmetry-breaking bifurcation. This flow is found to exist on an isolated bifurcation branch, whose upper and lower branches both lie on the boundary basin separating initial conditions that lead to turbulent events, and those that directly decay back to laminar flow. The structure of this flow, in which the disturbance to the basic flow is concentrated in a core region in a spanwise period, allowed the derivation of a corresponding spanwise-localised flow, which is also discussed. © 2016 Cambridge University Press. Source

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