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Osaka, Japan

Osaka Institute of Technology is a private university in Osaka Prefecture, Japan. Its main campus is located in Asahi-ku, Osaka City. Another campus is in Hirakata City. Wikipedia.

Nishiura H.,Osaka Institute of Technology | Fukuyama T.,Osaka University
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2016

We propose a simple phenomenological model of quarks-leptons mass matrices having fundamentally universal symmetry structure. These mass matrices consist of democratic and semi-democratic mass matrix terms commonly to the neutrino and the quark sectors and have only eight free parameters. We show that this mass matrix model well reproduces all the observed values of the MNS lepton and the CKM quark mixing angles, the neutrino mass squared difference ratio, and quark mass ratios, with an excellent agreement. The model also predicts δCPℓ=-94° for the leptonic CP violating phase and 〈 m〉 ≃ 0.0073 eV for the effective Majorana neutrino mass. © 2015 The Authors. Source

Koide Y.,Osaka University | Nishiura H.,Osaka Institute of Technology
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2012

A new yukawaon model is investigated under a family symmetry U(3)×S 3. In this model, all vacuum expectation values (VEVs) of the yukawaons, 〈Y f〉, are described in terms of a fundamental VEV matrix 〈Φ 0〉 as in the previous yukawaon model, but the assignments of quantum number for fields are different from the previous ones: the fundamental yukawaon Φ 0 is assigned to (3, 3) of U(3)×U(3), which is broken into (3, 1+2) of U(3)×S 3, although quarks and leptons are still assigned to triplets of U(3) and yukawaons Y f are assigned to 6 * of U(3). Then, VEV relations among yukawaons become more concise considerably than the previous yukawaon models. By adjusting parameters, we can fit not only quark mixing parameters but also lepton mixing parameters together with their mass ratios. © 2012 Elsevier B.V. Source

Kobayashi H.,Kyoto Institute of Technology | Higashimoto S.,Osaka Institute of Technology
Applied Catalysis B: Environmental | Year: 2015

Theoretical study on the catalytic oxidation of benzyl alcohol by molecular oxygen (O2) on the TiO2 surface was performed by DFT calculations. The anatase TiO2 crystal faces in the absence and presence of surface hydroxyl groups were modeled with a slab of Ti16O32 and Ti16O32(OH)H, respectively. The interaction of benzyl alcohol with Ti16O32 and Ti16O32(OH)H was calculated. It was clearly demonstrated that the surface hydroxyl groups on the TiO2 surface play a significant role in the formation of the alkoxide ([Ti]OCH2-ph) species. The orbitals of the alkoxide species was found to be hybridized with the O2p orbital in the valence band (VB) of the TiO2. The origin of the visible-light response in the photocatalytic system can be attributed to the electronic transition from the donor levels created by the alkoxide species to the conduction band (CB). Furthermore, reaction coordinates in the overall catalytic reaction of benzyl alcohol into benzaldehyde on the TiO2 surface were demonstrated, and the role of the visible-light irradiation was also discussed. © 2015 Elsevier B.V. Source

Ihara Y.,Osaka Institute of Technology
International Journal of Automation Technology | Year: 2012

A ball bar is a very convenient device for measuring the motion accuracy of machine tools. Some trials have also been done for measuring motion accuracy of industrial robots. Nowadays, multi-axis machines such as five-axis machining centers are very popular, and therefore, there is increased demand for checking their accuracy. This paper introduces an idea for checking the motion accuracy of five-axis machining centers and diagnosing error sources by reviewing trial measurements on articulated industrial robots. There are two problems. The first problem is that the ball bar can measure only distances, and the second problem is that the ball bar is a linear device and therefore not suitable for the rotary axis motion of 5- axis machines and articulated robots. Finally, the test conditions for the measurement of the motion accuracy of a machine tool showing conical motion, by using the ball bar and ISO/DIS 10791-6 (which is currently being edited) are reviewed and verified. Source

Seki H.,Osaka Institute of Technology | Mizumoto M.,Osaka Electro-Communication University
IEEE Transactions on Fuzzy Systems | Year: 2011

This paper addresses equivalence of fuzzy inference methods. It first presents several well-known fuzzy inference methods: the product-sum-gravity method, the simplified fuzzy inference method, the fuzzy singleton-type inference method, the single input rule modules connected type fuzzy inference method (SIRMs method), and the single input connected fuzzy inference method (SIC method). Second, three fuzzy inference methods of the product-sum-gravity method, simplified fuzzy inference method, and fuzzy singleton-type inference method, which are all widely used as fuzzy control methods, are shown to be equivalent to each other. Third, the equivalence conditions between the SIRMs method and the SIC method, known as single input type fuzzy inference method, are shown. Finally, it also gives the equivalence conditions between the single input type fuzzy inference methods and the previous three fuzzy inference methods. Investigating the equivalence among various fuzzy inference methods would help to understand the relationship of those fuzzy inference methods. © 2011 IEEE. Source

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