Nagao T.-Y.,Japan Advanced Institute of Industrial Technology
Proceedings of the IASTED International Conference on Modelling, Identification and Control | Year: 2016
There are many useful iterative methods for optimization, but there are global optimization problems that can not be solved by iterative methods and non-iterative methods are required for such problems. In this article, a novel and noniterative approach is presented for finding all the minimizing points of two-dimensional bi-quadratic spline surface under a box constraint. It is shown that the feasible set can be divided into finitely many branches according to the properties of the objective function and that the problem of finding all the minimizing points can be reduced to a finite combination of one dimensional solvable optimization problems. The idea of choosing the branches according to the structure of the objective function is detailed and a transformation of the objective function is proposed for the reduction of the problem dimension.
Kurumida J.,Japan Advanced Institute of Industrial Technology |
Yoo S.J.B.,University of California at Davis
IEEE Journal on Selected Topics in Quantum Electronics | Year: 2012
This paper discusses nonlinear optical signal processing employed in optical packet switching systems. Nonlinear optical signal processing provides optical label (header) recognition, optical switching, wavelength conversion, and time buffering with typically higher capacity, lower latency, and lower power consumption than electronic counterparts. In order to provide diverse signal processing functions, large-scale integration of nonlinear optical signal processing devices is essential. We discuss possible future directions in optical packet switching involving nonlinear optical signal processing of optical packets with advanced data and label modulation formats. © 2011 IEEE.
Nishizawa O.,Japan Advanced Institute of Industrial Technology |
Kanagawa K.,Chiba University
Geophysical Journal International | Year: 2010
Seismic velocity anisotropy of biotite schist (30 per cent-mode biotite) was measured under confining pressures up to 150 MPa. The rock shows weak orthotropy which was altered from transverse isotropy (TI) generated by biotite-preferred orientation. The orthotropy was caused by microfolding in the rock. The velocity increase under confining pressure indicates that most crack planes are aligned parallel to the cleavage planes (silicate sheet) of the oriented biotite minerals. The anisotropy of the rock is basically TI due to both the aligned biotite minerals and cracks, which have a common symmetry axis. We found that other sheet silicate-rich rocks have a similar anisotropy with the biotite schist, in which the TI-type anisotropy is characterized by the slow P- and S-wave velocities along the symmetry axis. This is caused by the preferred orientation of sheet silicate minerals and the extremely slow P- and S-wave velocities along the axis perpendicular to the silicate sheet compared to the directions along the silicate sheet. When rock contains a large percentage of highly oriented sheet silicates, the fast and slow shear waves exchange their polarities at some off-symmetry axis directions, indicating that the qS-wave (quasi-S wave) velocity exceeds the SH-wave velocity. The phase velocity distribution of qS wave shows an asymmetry with respect to the angle from the symmetry axis, which is characterized by a bulge in this distribution located near the symmetric axis. This is inherent to most sheet silicate minerals. When crack density of aligned cracks increases, the P-wave velocity along the symmetry axis decreases considerably. The qS-wave phase velocity in the off-axis directions also decreases, in accordance with the decrease of the P velocity along the symmetry axis. The asymmetry of the qS-wave phase velocity distribution increases as the P-wave velocity decreases along the symmetry axis. This relationship can be well understood by means of Berryman's extended Thomsen approach. © 2010 The Authors Journal compilation © 2010 RAS.
Guan H.,Ocean University of China |
Wang X.,Japan International Center for Materials Nanoarchitectonics |
Li H.,Japan Advanced Institute of Industrial Technology |
Zhi C.,Japan International Center for Materials Nanoarchitectonics |
And 3 more authors.
Chemical Communications | Year: 2012
Pure-phase CoO octahedral nanocages were successfully fabricated by a novel simple method. The coordination etching agents play key roles in the formation of these non-spherical hollow structures. When tested as anode materials in lithium ion batteries (LIBs), these nanocages showed excellent cycling performance, good rate capability and enhanced lithium storage capacity. © 2012 The Royal Society of Chemistry.
Yoneya M.,Japan Advanced Institute of Industrial Technology |
Kawasaki M.,Hitachi Ltd. |
Ando M.,Hitachi Ltd.
Journal of Physical Chemistry C | Year: 2012
Molecular dynamics simulations were performed for mono- and multilayer pentacene films on a simple model surface to study polymorphs of the deposition-processed thin-films. The layer-by-layer deposition history was taken into account by successive layer-stacking simulations of monolayer, bilayer and up to five-layered systems. We found that the tilt-free monolayer polymorph and the molecular tilting upon stacking layers on this monolayer were realized in the simulations even without any substrate interactions. These results imply that neither the monolayer nor the small angle tilted thin-film polymorph is substrate-induced as commonly explained. Our results also show a crucial dependence on the layer stacking history for the thin-film polymorph, which indicate that the thin-film polymorph would be induced with the layering history starting from the tilt-free monolayer. © 2011 American Chemical Society.
Fujita M.,University of Hyogo |
Yoshida Y.,University of Hyogo |
Miyata K.,University of Hyogo |
Wakisaka A.,Japan Advanced Institute of Industrial Technology |
Sugimura T.,University of Hyogo
Angewandte Chemie - International Edition | Year: 2010
It's the hype: The asymmetric synthesis of 3-alkyl-4-oxyisochroman-1-one is achieved by oxylactonization of ortho-alk-1-enylbenzoate with a series of optically active hypervalent iodine(III) reagents prepared from lactate or valine as a chiral source (see scheme). The oxylactonization is highly regio-, diastereo-, and enantioselective. © 2010 Wiley-VCH Verlag GmbH & Co. KGaA. © 2010 Wiley-VCH Verlag GmbH & Co. KGaA.
Tobita H.,Japan Advanced Institute of Industrial Technology
ACM International Conference Proceeding Series | Year: 2015
Comic-Crowd is an interactive digital comic system for developing and presenting multiple comic-book storylines and multiple visualizations. To date, digital comic books have had the same format and level of interaction since they first appeared. Thus, such comics have one storyline, and the interaction is akin to turning pages. In contrast, our approach supports multiple storylines, so that readers can select a storyline, with say, a happy or sad ending, depending on their preferences. Thus, our format and level of interaction are more dynamic than those of conventional digital comics. Moreover, since our format can provide multiple visualizations, it would be useful for a wide variety of applications. In this paper, we describe our Comic-Crowd concept and an implementation that expresses its unique interaction features and format. © 2015 ACM.
Koshimizu S.,Japan Advanced Institute of Industrial Technology
Advanced Materials Research | Year: 2011
Glass disks are used as substrates for the recording media in magnetic disk devices. To mass produce glass disks, a technology is required for machining glass (a material that is difficult to machine) with both high precision and high efficiency. Consequently, this study adopted a method that processes the inner-and outer-diameters simultaneously using a double core tool. In addition, the thrust force in coring process was also reduced using an ultrasonic spindle to apply ultrasonic vibration to the feed direction of the rotating tool. This resulted in high quality machining with less chipping. Furthermore, this study conducted experiments to compare the three methods of stabilizing the stack of glass substrates. As a result, it was found that the method using ultraviolet curable resin was able to limit the chipping to a smaller size. © (2011) Trans Tech Publications, Switzerland.
Ueda R.,Japan Advanced Institute of Industrial Technology
Advances in Intelligent Systems and Computing | Year: 2016
We modify Q-MDP value method and observe the behaviors of a robot with the modified method in an environment, where state information of the robot is essentially indefinite. In Q-MDP valuemethod, an action in every time step is chosen based on a calculation of expectation values with a probability distribution, which is the output of a probabilistic state estimator. The modified method uses a weighting function with the probability distribution in the calculation so as to give precedence to the states near the goal of the task. We applied our method to a simple robot navigation problem in an incomplete sensor environment. As a result, the method makes the robot take a kind of searching behavior without explicit implementation. © Springer International Publishing Switzerland 2016.
Cao M.,Tokyo Metropolitan College of Industrial Technology |
Hashimoto H.,Japan Advanced Institute of Industrial Technology
IECON Proceedings (Industrial Electronics Conference) | Year: 2013
This paper describes a specific person recognition method and tracking control system with Kinect on-board a mobile robot. An individual recognition algorithm using individual skeletal features is proposed and the experiment results are reported in this paper. The experiment for verifying the proposed method was conducted by recognizing a specific person from two moving persons. The experiment results show that the proposed algorithm is effective in the case that there are individual differences between skeletons. © 2013 IEEE.