Gifu National Institute of Technology

Gifu, Japan

Gifu National Institute of Technology

Gifu, Japan

Time filter

Source Type

Tomita I.,Gifu National Institute of Technology
Solid State Communications | Year: 2017

A simple calculation to determine the diffusion constant D for electrons in disorder mesoscopic Au rings from the temperature dependence of the current obtained by Chandrasekhar et al. (1991) [1] gives larger D than the diffusion constant D′ obtained from Einstein's relation via resistance measurements. In addition, the curve-fitting function employed by them does not agree well with the temperature-dependent data below 10 mK. Using a more precise calculation based on the quasi-particle picture, we show that the discrepancy between the fitting function and the experimental data below 10 mK is reduced and that a newly obtained D is close to D′. The method proposed here is very simple to determine the diffusion constant in a small closed loop via the curve-fitting of the temperature-dependent data, which needs no resistance measurements for the use of Einstein's relation. © 2017 Elsevier Ltd


Tagaya M.,Nagaoka University of Technology | Motozuka S.,Gifu National Institute of Technology
Optical Materials | Year: 2017

Organic/inorganic hybrids of 8-hydroxyquinoline (8Hq) molecule and hydroxyapatite nanocrystal (HAp) were mechanochemically prepared. In the hybrids, a green photoluminescence peak at 500 nm newly appeared, suggesting the chemical bonding of the 8Hq molecule with the Ca2+ ions of HAp. Then, the organic/inorganic interfacial photofunction was clarified by a molecular orbital calculation. The interfacial chemical bonding between the O and N atoms of 8Hq and the Ca2+ ions of HAp was attributed to both covalent O[sbnd]Ca and ionic N[sbnd]Ca. The resultant wave functions revealed that the green luminescence was attributed to metal-to-ligand charge transfer (MLCT) from the O atoms of phosphate group (HAp) to the π-cloud (8Hq) in the HOMO of the hybrids. Therefore, the photofunctional interfaces of the hybrids were successfully demonstrated. © 2017 Elsevier B.V.


Yasuda M.,Gifu National Institute of Technology
Proceedings - 2016 Joint 8th International Conference on Soft Computing and Intelligent Systems and 2016 17th International Symposium on Advanced Intelligent Systems, SCIS-ISIS 2016 | Year: 2016

This article is dealing with the fuzzy clustering algorithm combined with deterministic annealing and Tsallis entropy maximization. In this article, a method to determine a q-parameter and an initial annealing temperature Thigh for the algorithm is presented. Tsallis entropy is the q-parameter extension of Shannon entropy. By maximizing Tsallis entropy within the framework of fuzzy c-means, a membership function similar to the statistical mechanical distribution functions is obtained. One of the major issue of this method is that how to determine appropriate q and Thigh for a data distribution is not clear. For the purpose of this article, an approximation method of the membership function is examined. Experiments are performed and the results indicate that the proposed method works properly and both q and Thigh can be determined automatically and algebraically from a data distribution. © 2016 IEEE.


Yasuda M.,Gifu National Institute of Technology
SCIS and ISIS 2010 - Joint 5th International Conference on Soft Computing and Intelligent Systems and 11th International Symposium on Advanced Intelligent Systems | Year: 2010

This article is dealing with the fuzzy clustering method which combines the deterministic annealing (DA) approach with entropy, especially Shannon entropy and Tsallis entropy. By maximizing Shannon entropy, fuzzy entropy or Tsallis entropy within the framework of the fuzzy c-means (FCM) method, membership functions similar to the statistical mechanical distribution functions are obtained. We examine the characteristics of these entropy and membership functions from the statistical mechanical point of view. After that, both Shannon and Tsallis entropy based FCMs are formulated as DA clustering using the very fast annealing (VFA) method as a cooling schedule. Numerical experiments are performed and the obtained results indicates that Tsallis entropy based FCM clustering is suitable for very fast DA clustering.


Kan N.,Gifu National Institute of Technology | Kobayashi K.,Yamaguchi University | Shiraishi K.,Yamaguchi University
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2013

We show that the higher order gravity model proposed by Meissner and Olechowski has a graviton mode, a massive spin-two excitation, and no scalar mode in a maximally symmetric spacetime; therefore, by choosing the coefficients, we can construct a Lagrangian for "critical gravity" from higher order terms of curvatures in higher dimensions. We also give a comment on construction of the theory with multicriticality in higher order gravities. © 2013 American Physical Society.


Yasuda M.,Gifu National Institute of Technology
6th International Conference on Soft Computing and Intelligent Systems, and 13th International Symposium on Advanced Intelligence Systems, SCIS/ISIS 2012 | Year: 2012

This article is dealing with the fuzzy clustering method which combines the deterministic annealing (DA) approach with Tsallis entropy. Tsallis entropy is a q parameter extension of Shannon entropy. By maximizing Tsallis entropy within the framework of fuzzy c-means (FCM), a membership function similar to the statistical mechanical distribution functions is obtained. One of the major issue of the Tsallis entropy maximization method is that how to determine the q value is not clear. We have adjusted the q value to minimize the objective function, because q strongly affects the extent of the membership function. Numerical experiments are performed and the obtained results indicate that the proposed method works properly and the q value can be adjusted so as to make a membership function fit to a data distribution. © 2012 IEEE.


Yasuda M.,Gifu National Institute of Technology
Proceedings - 2011 8th International Conference on Fuzzy Systems and Knowledge Discovery, FSKD 2011 | Year: 2011

The deterministic annealing (DA) and simulated annealing (SA) methods are well combined as DASA. By regularizing the fuzzy c-means method with the fuzzy entropy, the Fermi-Dirac distribution function, well known in statistical mechanics, is obtained as a membership function, and, while optimizing its parameters by SA, the minimal of the Helmholtz free energy for fuzzy c-means clustering is searched by DA. Since shapes of membership functions obtained by DASA are very rough, it is important to interpolate them. Thus, interpolation is introduced to DASA and shows its effectiveness by a numerical experiment. © 2011 IEEE.


Mori T.,Gifu National Institute of Technology
Electrical Engineering in Japan (English translation of Denki Gakkai Ronbunshi) | Year: 2013

This paper proposes a new design method for a frequency-dependent servo system for the positioning of flexible structures. In order to reduce sensor costs and to suppress spillover phenomena caused by ignored elastic modes of the plant, we introduce a prefilter into an input which possesses the characteristics of a notch filter. The proposed method allows for the design of the specified characteristics of the prefilter and for precise assignment of poles to desirable locations in a closed-loop system. As a result, the tradeoff problem between suppression and transients can be resolved. The results of simulations and experiments are given in order to verify the usefulness of this method. © 2013 Wiley Periodicals, Inc.


Yasuda M.,Gifu National Institute of Technology
Advances in Fuzzy Systems | Year: 2011

This paper is dealing with the fuzzy clustering method which combines the deterministic annealing (DA) approach with an entropy, especially the Shannon entropy and the Tsallis entropy. By maximizing the Shannon entropy, the fuzzy entropy, or the Tsallis entropy within the framework of the fuzzy c-means (FCM) method, membership functions similar to the statistical mechanical distribution functions are obtained. We examine characteristics of these entropy-based membership functions from the statistical mechanical point of view. After that, both the Shannon- and Tsallis-entropy-based FCMs are formulated as DA clustering using the very fast annealing (VFA) method as a cooling schedule. Experimental results indicate that the Tsallis-entropy-based FCM is stable with very fast deterministic annealing and suitable for this annealing process. Copyright 2011 Makoto Yasuda.


Mori T.,Gifu National Institute of Technology
International Conference on Control, Automation and Systems | Year: 2012

Recently, study on a control of flexible manipulators have been receiving increasing attension in the domain of master-slave system. The master-slave system is a control system to operate a manipulator for objects in a remote environment which is at a distance from the presence of a human operator. In order to consider the influence by the elasticity of flexible manipulators, it is necessary to study on the control of vibration of flexible master-slave manipulators and the passivity. Thus in this paper, we discuss about a new modified bilateral controller considering the elasticity by using intervention impedance in basis on the passivity and a control performance of the system. This paper is organized in the following way : First, we introduce mechanical models of manipulators. Second, we propose bilateral controls by using intervention impedance based on passivity. Third, we transeform each models represented by time domain into models represented by s-plain, find the scattering matrix, and prove the passivity of system. Fourth, we propose a new modified controller controller for the purpose of realizaion. Lastly, we show some results of experiments in order to verify the usefulness of proposed controller. © 2012 ICROS.

Loading Gifu National Institute of Technology collaborators
Loading Gifu National Institute of Technology collaborators