Kumamoto Industrial Research Institute

Kumamoto-shi, Japan

Kumamoto Industrial Research Institute

Kumamoto-shi, Japan
SEARCH FILTERS
Time filter
Source Type

Michino R.,Kumamoto Industrial Research Institute | Mizumoto I.,Kumamoto University
International Journal of Advanced Mechatronic Systems | Year: 2011

This paper presents a design method of high gain adaptive output feedback controller for non-linear systems with higher order relative degree and some uncertainties in control input term. The controlled system is transformed by two virtual filters and the control input is designed so as to make the virtual filter's signal a high gain adaptive control signal using backstepping strategy in the filter dynamics. The proposed method is useful in cases where only the output signals are available. Copyright © 2011 Inderscience Enterprises Ltd.


Hamashima H.,Kumamoto Industrial Research Institute | Shibuta M.,Kumamoto University | Itoh S.,Okinawa National College of Technology
Materials Science Forum | Year: 2011

The food processing technology using a shock wave can prevent deterioration of the food by heat because it can process food in a short time. Generally, since the shock wave used for food processing is generated by underwater explosion, the load of a shock wave to the food becomes very complicated. Therefore, in order to process safely, it is important to clarify the behaviors of the shock wave and the bubble pulse generated by underwater explosion. In this research, in order to investigate the behavior of the shock wave in the water tank used for food processing, the optical observation experiment and the numerical simulation were performed. In the experiment, the shock wave generated by underwater explosion was observed with the high-speed video camera. The numerical simulation about the behavior of bubble pulse was performed using analysis software LS-DYNA. Comparing and examining were performed about the experimental result and the numerical simulation result. The result of the numerical simulation about the behavior of the shock wave generated by underwater explosion and the shock wave generated by the bubble pulse and the bubble pulse was well in agreement with the experimental result. © (2011) Trans Tech Publications.


Michino R.,Kumamoto Industrial Research Institute | Sakamoto Y.,Kumamoto University | Mizumoto I.,Kumamoto University
Proceedings of the SICE Annual Conference | Year: 2011

In this paper, a high gain adaptive control is investigated for nonholonomic systems with uncertain control coefficient. The designed adaptive controller is rather simple, since it has only one adaptive adjusting term. The application of this controller to a nonholonomic wheeled mobile robot is considered as an illustrative example. © 2011 SICE.


Michino R.,Kumamoto Industrial Research Institute | Mizumoto I.,Kumamoto University
2010 International Conference on Modelling, Identification and Control, ICMIC 2010 | Year: 2010

In this paper, a high gain adaptive control is investigated for nonholonomic systems with unknown system parameters and unbounded dynamic uncertainties and/or disturbances. The designed adaptive controller is rather simple and has high robustness for bounded unknown uncertainties and disturbances, since it is designed based on high gam feedback and has only one adaptive adjusting term. The application of this controller to a nonholonomic wheeled mobile robot is considered as an illustrative example.


Kawamura K.,Kumamoto University | Sakamoto S.,Kumamoto University | Murai M.,Kumamoto Industrial Research Institute
Proceedings of the 8th International Conference on Leading Edge Manufacturing in 21st Century, LEM 2015 | Year: 2015

Stainless steel machined parts are widely used in semiconductor manufacturing, automobile and aerospace industry and so on. This study describes about the characteristics of SUS304 austenitic stainless steel machined surfaces by end milling and burnishing processing on the machining center. It is found by metallographic structure analysis by X-ray diffraction test for surface-hardened layers of steel that SUS304 which have originally austenitic structure before burnishing process is changed to martensitic structure. In this paper, relationship between burnishing conditions and metallographic structure was experimentally evaluated. As a result, relationship between hardness and martensitic structure of SUS304 is clearly observed by the ratio of austenitic and martensitic structures.


Michino R.,Kumamoto Industrial Research Institute | Mizumoto I.,Kumamoto University
International Journal of Advanced Mechatronic Systems | Year: 2013

In this paper, a robust adaptive controller design method for non-holonomic mobile robots with the state depended uncertainties in the non-holonomic constraints is proposed. The considered uncertainties are Lipschitz. The designed robust adaptive controller is rather a simple structure, since it has only one adaptive adjusting term which is a feedback gain designed based on high gain technique. Further, the controller achieves not only the stability of the controlled system but also convergence to a small region around origin by increasing the design parameters. Copyright © 2013 Inderscience Enterprises Ltd.


Michino R.,Kumamoto Industrial Research Institute | Sakamoto Y.,Kumamoto University | Mizumoto I.,Kumamoto University
2012 International Conference onAdvanced Mechatronic Systems, ICAMechS 2012 | Year: 2012

In this paper, we propose the design method of a high gain adaptive feedback controller for uncertain nonholonomic systems. The systems have some uncertainties in the dynamics and the nonholonomic constraints. To show the effectiveness of the proposed method, the application of the controller to a nonholonomic wheeled mobile robot is described in the numerical simulation. © 2012 Intl Jrnal Advanced Mech.


Ohgi Y.,Yokohama National University | Ishihara A.,Yokohama National University | Matsuzawa K.,Yokohama National University | Mitsushima S.,Yokohama National University | And 4 more authors.
Journal of the Electrochemical Society | Year: 2013

Partially oxidized zirconium carbonitrides (Zr-CNO) were evaluated as a non-precious-metal cathode used for polymer electrolyte fuel cells. The zirconium-oxide-based catalystswere prepared from zirconium carbonitrides under controlled oxygen partial pressures from 10-2 to 10-18 atm at 1000°C. The ORR activity of Zr-CNO showed a volcano-like tendency against the degree of oxidation (DOO).We found a significant lattice-parameter decrease for highly active Zr-CNOs, and this could be ascribed for the formation of oxygen- and zirconium-vacancies in monoclinic ZrO2. On the other hand, carbon originated from starting materials was deposited on the surface of Zr-CNOs during the partial oxidation process.We also found that the oxygen content on the surface of highly active Zr-CNOs was drastically decreased when the amount of carbon significantly decreased during partial oxidation processes. This result indicates that the deposited carbon acted as a strong reduction agency. From XPS and XRD analyzes, there is a linear relationship between the ORR current and amount of oxygen vacancy formed in monoclinic phase. Therefore, we believe that oxygen vacancy formed in monoclinic phase could act as active sites for the ORR. © 2012 The Electrochemical Society.


Ishihara A.,Yokohama National University | Tamura M.,Yokohama National University | Ohgi Y.,Yokohama National University | Ohgi Y.,Kumamoto Industrial Research Institute | And 5 more authors.
Journal of Physical Chemistry C | Year: 2013

Tantalum-oxide-based oxygen-reduction-reaction (ORR) catalysts have the ORR activity only when they are synthesized from tantalum carbonitrides. Namely pure Ta2O5 does not show ORR activity, and carbon or nitrogen in precursors is inevitable to form ORR active sites and to promote ORR. To clarify this reason, we investigated structural and surface electronic properties of tantalum-oxide-based catalysts, which were synthesized by gradually oxidizing tantalum carbonitride under low partial pressure of oxygen at 1000 C, by using X-ray absorption spectroscopy, transmission electron microscopy, and Raman spectroscopy. The results indicate that oxidized tantalum carbonitrides with high ORR activity had oxygen vacancies near the surface, indicating that the vacancies could work as an active site for ORR. We also found that carbon was deposited on the oxide's surface during oxidation of tantalum carbonitrides. The deposited carbon seems to play two important roles in formation of oxygen vacancies (ORR active sites) providing reductive atmosphere, and in producing electron conduction paths on rather insulating oxides' surface. © 2013 American Chemical Society.


PubMed | Kumamoto University, CNRS Institute of Molecular Sciences, Kumamoto Industrial Research Institute and University of Bordeaux Segalen
Type: Journal Article | Journal: Nano letters | Year: 2016

Synthesis of chiral inorganic or hybrid nanomaterials through sol-gel transcription of chiral organic templates has attracted a great deal of interest for more than a decade. However, the chiral nature of these inorganic matrices has never been directly observed. For the first time, we report a direct evaluation of chirality on noncrystalline silica chiral nanoribbons by vibrational circular dichroism (VCD) measurements. Strong Cotton effect around 1150-1000 cm

Loading Kumamoto Industrial Research Institute collaborators
Loading Kumamoto Industrial Research Institute collaborators