National Institute of Technology, Kumamoto College

Kumamoto, Japan

National Institute of Technology, Kumamoto College

Kumamoto, Japan
SEARCH FILTERS
Time filter
Source Type

Saito I.,National Institute of Technology, Kumamoto College
Journal of Environmental Engineering (Japan) | Year: 2017

The control of solar radiation on roofs is one of the most important subjects in improvement of the indoor thermal environment of residential buildings. However, there is very little research on the relation between roof forms and the thermal environment. The purpose of this study is to clarify the relation between the roof form and the attic temperature by model experiments and numerical simulations. The result of the model experiment shows that the attic temperature is greatly influenced by roof forms, such as roof shape, roof pitch and roof azimuth. The tendency of model experiment matches the result of numerical simulation well. The attic temperatures for various roof forms in summer and winter are calculated using weather data of typical points in Japan. As a result, the relationship and the regional characteristic between the roof form and the attic temperature are clarified.


Tanaka T.,National Institute of Technology, Kumamoto College
IOP Conference Series: Earth and Environmental Science | Year: 2016

An experimental setup for the visualization of a cryogenic pump, which is to investigate the relationship between the flowfield in a pump and the thermodynamic effect of a cavitation, was constructed. The experimental setup with the cryogenic pump is a closed loop and is consisted of a tank, a suction pipe, a visualization section, a test pump and a flow mater. There are two visualization sections in this system. One is the visualization section for the pump impeller cavitation using liquid nitrogen and this section is established on the pump casing. Another is the visualization section for the blade cavitation using liquid nitrogen and this section is inserted in the pump suction side. These sections are set up individually for the object of the visualization. From pilot study using this visualization system with the cryogenic pump, it was shown that the subcooled liquid nitrogen could be generated by this system and this liquid nitrogen could be circulated in this pump system with the visualization section. And it was indicated that various visualization experiments of the cavitating pump and blade using the subcooled liquid nitrogen can be conducted by using the developed setup.


Sun N.,National Institute of Technology, Kumamoto College | Okumura R.,National Institute of Technology, Kumamoto College
Proceedings - 31st IEEE International Conference on Advanced Information Networking and Applications Workshops, WAINA 2017 | Year: 2017

We proposed an alternative method to use 3D depth sensors for tracking moving target instead of normal camera, and we developed a pattern recognition algorithm based on our real-time tracking results. In this paper we will present our algorithm and approaches, experimental results and verification. © 2017 IEEE.


Sun N.,National Institute of Technology, Kumamoto College | Sakai Y.,National Institute of Technology, Kumamoto College
Proceedings - 31st IEEE International Conference on Advanced Information Networking and Applications Workshops, WAINA 2017 | Year: 2017

We have introduced motion sensors into our researches of human motion capture in order to decrease the difficulty during anime production by free-hand. In this paper we will present an algorithm and approaches to simulate human gait with motion sensors. Some experimental results of verifications will be provided also. © 2017 IEEE.


Goto K.,National Institute of Technology, Kumamoto College
Tubular Structures - Proceedings of the 15th International Symposium on Tubular Structures, ISTS 2015 | Year: 2015

Seismic response and damage of concrete filled steel tube frame (CFT frame) are calculated in relation with the column overdesign factor (rcb) and its distribution. The numerical analysis method to predict the damage of CFT frame under strong ground motion is obtained by introducing the damage ratios of cracking and local buckling of both CFT column and H-section beam. CFT frames with rcb distributed uniformly or not-uniformly are designed. By the use of the presented analysis method the static analysis and the seismic response analysis of these designed CFT frames have been calculated and the damages of CFT frame are obtained quantitatively. From these results it is pointed that the distribution of rcb is one of the important design factor. © 2015 Taylor & Francis Group, London.


Fuchida K.,National Institute of Technology, Kumamoto College
WIT Transactions on the Built Environment | Year: 2011

This paper presents an evaluating method for seismic behaviour of pipelines during earthquakes and studies the response characteristics of them for various conditions of ground displacements and pipelines. The proposed method consists of mainly two analytical methods which are the seismic response analysis of surface ground layers and the pseudo static response analysis of buried pipelines. The seismic response analysis method for surface ground layers is 2-dimensional effective stress analysis based on Biot's two phase mixture theory and Iai's constitutive equation. The pipeline analysis is based on a beam theory on an elastic foundation and modified transfer matrix method. Numerical computations are performed for various models with changing conditions of ground and pipes. As a result, axial and lateral response characteristics of pipelines are shown and evaluated by relating with earthquakes, grounds and pipelines conditions. © 2011 WIT Press.


Yamamoto Y.,Waseda University | Fujimoto S.-I.,National Institute of Technology, Kumamoto College | Nagakura H.,Kyoto University | Nagakura H.,Waseda University | Yamada S.,Waseda University
Astrophysical Journal | Year: 2013

We perform experimental simulations with spherical symmetry and axisymmetry to understand the post-shock-revival evolution of core-collapse supernovae. Assuming that the stalled shock wave is relaunched by neutrino heating and employing the so-called light bulb approximation, we induce shock revival by raising the neutrino luminosity up to the critical value, which is determined by dynamical simulations. A 15 M⊙ progenitor model is employed. We incorporate nuclear network calculations with a consistent equation of state in the simulations to account for the energy release by nuclear reactions and their feedback to hydrodynamics. Varying the shock-relaunch time rather arbitrarily, we investigate the ensuing long-term evolutions systematically, paying particular attention to the explosion energy and nucleosynthetic yields as a function of relaunch time, or equivalently, the accretion rate at shock revival. We study in detail how the diagnostic explosion energy approaches the asymptotic value and which physical processes contribute in what proportions to the explosion energy. Furthermore, we study the dependence of physical processes on the relaunch time and the dimension of dynamics. We find that the contribution of nuclear reactions to the explosion energy is comparable to or greater than that of neutrino heating. In particular, recombinations are dominant over burnings in the contributions of nuclear reactions. Interestingly, one-dimensional (1D) models studied in this paper cannot produce the appropriate explosion energy and nickel mass simultaneously; nickels are overproduced. This problem is resolved in 2D models if the shock is relaunched at 300-400 ms after the bounce. © 2013. The American Astronomical Society. All rights reserved.


Czarnecki M.A.,Wrocław University | Morisawa Y.,Kinki University | Futami Y.,National Institute of Technology, Kumamoto College | Ozaki Y.,Kwansei Gakuin University
Chemical Reviews | Year: 2015

The usefulness and uniqueness of near-infrared (NIR) spectroscopy in the study of molecular structure and interactions was studied. The uniqueness of NIR spectroscopy arises mainly from the anharmonicity of the molecular vibrations. Thus, a deeper understanding of anharmonicity and molecular vibrational potentials provides further insight into chemical bonding, molecular structure, and interactions. The examinations of the gas-phase overtone spectra coupled with the high-level theoretical calculations provided valuable information on the molecular structure and interactions. Recently the first studies of matrix-isolated complexes and ionic liquids by using NIR spectroscopy have been reported. All these works clearly show that the NIR region is not simply an extension of the MIR region, it provides specific information on molecular structure and hydrogen bonding not available from any other spectral range. In analyzing NIR spectra, one should take into account the specific properties that make this spectral region unique and different from the MIR region. The elimination or significant restriction of the possible resonances one can achieve by measurement of the NIR spectra in the higher overtones region, where the vibrations are well described by the LMM and are less coupled to other modes and to each other.


Kaneda T.,National Institute of Technology, Kumamoto College | Motoki J.Y.D.,National Institute of Technology, Kumamoto College
Developmental Biology | Year: 2012

Studies of meso-endoderm and neural induction and subsequent body plan formation have been analyzed using mainly amphibians as the experimental model. . Xenopus is currently the predominant model, because it best enables molecular analysis of these induction processes. However, much of the embryological information on these inductions (. e.g., those of the Spemann-Mangold organizer), and on the morphogenetic movements of inductively interacting tissues, derives from research on non-model amphibians, especially urodeles. Although the final body pattern is strongly conserved in vertebrates, and although many of the same developmental genes are expressed, it has become evident that there are individually diverse modes of morphogenesis and timing of developmental events. Whether or not this diversity represents essential differences in the early induction processes remains unclear. The aim of this review is to compare the gastrulation process, induction processes, and gene expressions between a urodele, mainly . Cynops pyrrhogaster, and an anura, . Xenopus laevis, thereby to clarify conserved and diversified aspects. . Cynops gastrulation differs significantly from that of . Xenopus in that specification of the regions of the . Xenopus dorsal marginal zone (DMZ) are specified before the onset of gastrulation, as marked by blastopore formation, whereas the equivalent state of specification does not occur in . Cynops until the middle of gastrulation. Detailed comparison of the germ layer structure and morphogenetic movements during the pre-gastrula and gastrula stages shows that the entire gastrulation process should be divided into two phases of notochord induction and neural induction. . Cynops undergoes these processes sequentially after the onset of gastrulation, whereas . Xenopus undergoes notochord induction during a series of pre-gastrulation movements, and its traditionally defined period of gastrulation only includes the neural induction phase. Comparing the structure, fate, function and state of commitment of each domain of the DMZ of . Xenopus and . Cynops has revealed that the true form of the Spemann-Mangold organizer is suprablastoporal . gsc-expressing endoderm that has notochord-inducing activity. . Gsc-expressing deep endoderm and/or superficial endoderm in . Xenopus is involved in inducing notochord during pre-gastrulation morphogenesis, rather than both . gsc- and . bra-expressing tissues being induced at the same time. © 2012 Elsevier Inc.


Suzuki M.,Nagoya Institute of Technology | Yanagitani T.,Nagoya Institute of Technology | Odagawa H.,National Institute of Technology, Kumamoto College
Applied Physics Letters | Year: 2014

Polarity inversion in wurtzite film is generally achieved by the epitaxial growth on a specific under-layer. We demonstrate polarity inversion of c-axis oriented ScAlN films by substrate ion beam irradiation without using buffer layer. Substrate ion beam irradiation was induced by either sputtering a small amount of oxide (as a negative ion source) onto the cathode or by applying a RF bias to the substrate. Polarity of the films was determined by a press test and nonlinear dielectric measurement. Second overtone thickness extensional mode acoustic resonance and suppression of fundamental mode resonance, indicating complete polarity inversion, were clearly observed in bilayer highly oriented (000-1)/(0001) ScAlN film. © 2014 Author(s).

Loading National Institute of Technology, Kumamoto College collaborators
Loading National Institute of Technology, Kumamoto College collaborators