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Yonago, Japan

Kuraoka T.,Yonago College
Fuzzy Sets and Systems | Year: 2016

We study (complete) fuzzy ideals on semilattices from the point of view of tensor products of semilattices. We show that the lattice of all complete fuzzy ideals on a semilattice is an extension of tensor product. We define the notion of semicomplete bi-ideals, and show that the lattice of all fuzzy ideals on a distributive lattice is isomorphic to the lattice of all semicomplete bi-ideals. Moreover, we show that the lattice of all (complete) fuzzy ideals on a distributive (algebraic) lattice is distributive. © 2015 Elsevier B.V.


Kawabe H.,Yonago College
Modern Physics Letters A | Year: 2013

We construct a two-dimensional (2D) causal dynamical triangulation (CDT) model from a matrix model which represents the loop gas model of closed string. The target-space index is reinterpreted as time or geodesic distance. We apply stochastic quantization method to the model to obtain the Generalized CDT (GCDT), which has additional interaction of creating baby universe. If we take a specific scaling in continuum limit, we realize an extended GCDT model characterized by the noncritical string field theory. © 2013 World Scientific Publishing Company.


This study proposes the combinations of some hydrodynamic shapes formed on the end or the annular surface of oil impregnated sintered porous bearing as a DC spindle motor's bearing system. Hydro Wave Bearing or Pump In as a thrust hydrodynamic shape, and Herring Bone (I&II), Three Lobed Type or Sleeve as a radial hydrodynamic shape were proposed, and the total of eight kinds of combinations were produced as thrust-radial coupled bearing. It examines to optimize the hydrodynamic shape combination experimentally as thrust-radial coupled bearing by measuring the lubrication characteristics. This research report is especially referred to the experimental examination for Settling Time, Lissajous Curve diagram or Shaft Whirling by measuring the Time History Waveform of shaft such as the lubrication characteristics under unsteady shaft starting condition. Furthermore this report examines the influence of diametral clearance change to the lubrication characteristics such as above mentioned by measuring the Time History Waveform of shaft under shaft starting condition. © 2013 The Japan Society of Mechanical Engineers.


This article organized and analyzed "34 sheets of data materials for Munafuda (Dedication board)" remained in Hachiman shrine in Higashi-yawata, Yonago-city Tottori prefecture. The ordinary configuration for Munafuda of Hachiman shrine has "Pointed end shape" for front edge and "Narrowed rear end shape" for body. The high commonality could be observed in the notation method of contents and we also found there was a stylized or defined form for Munafuda. Furthermore, we revealed that "Eight-Hachiman shrine" were established in Houki region and Izumo region in medieval times by "Data materials of Munafuda".


This report is described the examination of some hydrodynamic shapes formed at the annular surface of oil impregnated sintered porous bearing as DC spindle motor's bearing system. Herring Bone (I & II), Three Lobed Type or Sleeve as a radial hydrodynamic shape were proposed, and four kinds of specimens were produced as a porous journal bearing. It was examined experimentally to optimize the hydrodynamic shape of porous journal bearing with pivot supported condition by measuring the lubrication characteristics. This research report is especially referred the experimental examination for Settling Time, Lissajous Curve diagram or Shaft Whirling Behavior by measuring the Time History Waveform of shaft such as above mentioned lubrication characteristics under shaft unsteady condition. Furthermore, in this report, it is investigated to discuss the influences of diametral clearance change and gradient on starting revolution speed change to the lubrication characteristics by measuring the Time History Waveform of shaft under the same condition. In addition, in order to investigate more detailed rotating behavior of shaft, authors practice the Frequency Spectrum Analysis of Time History Waveform with FFT. © 2013 The Japan Society of Mechanical Engineers.

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