Ie Y.,Osaka University |
Ueta M.,Osaka University |
Nitani M.,Osaka University |
Tohnai N.,JST PRESTO |
And 4 more authors.
Chemistry of Materials | Year: 2015
4,9-Dihydro-s-indaceno[1,2-b:5,6-b′]dithiazole-4,9-dione (IDD) was designed as a novel electronegative unit, and the π-conjugated compound (2C-TzPhTz) containing it was synthesized as a candidate for air-stable n-type organic field-effect transistor (OFET) materials. Cyclic voltammetry measurements revealed that the IDD unit contributes to lowering the lowest unoccupied molecular orbital (LUMO) energy level. X-ray crystallographic analysis of 2C-TzPhTz showed an almost planar molecular geometry and dense molecular packing, which is advantageous to electron transport. OFETs based on 2C-TzPhTz showed high electron mobility of up to 0.39 cm2 V-1 s-1, which is one of the highest electron mobilities observed among pentacyclic dione-based materials. Top-contact OFET devices showed operating stability and long-term stability under ambient conditions, attributed to the low-lying LUMO energy level and dense packing in the solid state. Furthermore, bottom-contact OFETs also maintained good electron mobility beyond 0.1 cm2 V-1 s-1 under air-exposed conditions. We demonstrated that n-type OFETs are more sensitive to H2O than O2 and found that the acquirement of air stability for the 2C-TzPhTz-based OFET is due to the increased stability against not only O2 but also H2O. All of these results indicate that IDD is a potentially useful building unit for high-performance air-stable n-type semiconducting materials. © 2012 American Chemical Society.
Oishi-Tomiyasu R.,JST PRESTO |
Oishi-Tomiyasu R.,Tohoku University
Acta Crystallographica Section A: Foundations and Advances | Year: 2016
Geometrical ambiguity means the cases in which more than one powder indexing solution exists. Using a new function implemented in the powder indexing software CONOGRAPH, unit cells that involve geometrical ambiguity are exhaustively searched. As a result, many unknown cases are obtained, although the number of such unit cells is still rather limited. It is also proven that the number of solutions in powder auto-indexing is not always unique, but generally finite. © 2016 International Union of Crystallography.
Okabe M.,University of Electro - Communications |
Anjyo K.,Japan Science and Technology Agency |
Onai R.,JST PRESTO
Proceedings - Digital Production Symposium 2012, DigiPro 2012 | Year: 2012
We propose a method to extract fluids from a video that is captured outside a special studio. Since such a video usually has a complex background and the fluids overlap with much transparency, it is a difficult, time-consuming task for a designer to extract them. Our goal is to develop an efficient method to solve the problem: we estimate the background of an input video, and then compute the foreground and alpha matte at each frame. Our method estimates the background by observing only pixels that have little motion at each frame. Given the estimated background, we estimate an initial alpha matte based on the color difference at every pixel between each frame and the estimated background. Since the initial alpha matte usually includes many artifacts, we employ the gradient-domain image processing approach to refine it: our method attenuates unrequired gradients adequately, and then integrate them to recover the refined alpha matte. The foreground, which explains about the color and texture pattern of the fluid itself, is also estimated in a similar manner. We demonstrate that our method enables to extract the fluids from a video, which were difficult to achieve using the previous methods. Copyright © 2012 by the Association for Computing Machinery, Inc.
Akizuki Y.,Kyoto University |
Yamada I.,Osaka Prefecture University |
Fujita K.,Kyoto University |
Nishiyama N.,JST PRESTO |
And 6 more authors.
Inorganic Chemistry | Year: 2013
A novel cubic perovskite MnCu3V4O12 has been synthesized at a high pressure and high temperature of 12 GPa and 1373 K. This compound crystallizes in the A-site-ordered perovskite structure (space group Im3̄) with lattice constant a = 7.26684(10) Å at room temperature. The most notable feature of this compound lies in the fact that the Mn2+ ion is surrounded by 12 equidistant oxide ions to form a regular icosahedron; the situation of Mn2+ is unprecedented for the crystal chemistry of an oxide. An anomalously large atomic displacement parameter Uiso= 0.0222(8) Å2 is found for Mn 2+ at room temperature, indicating that the thermal oscillation of the small Mn2+ ion in a large icosahedron is fairly active. Magnetic susceptibility and electric resistivity measurements reveal that 3d electrons of Mn2+ ions are mainly localized, while 3d electrons in Cu 2+ and V4+ ions are delocalized and contribute to the metallic conduction. © 2013 American Chemical Society.
Osawa H.,JST PRESTO |
Yamada S.,Japan National Institute of Information and Communications Technology
Artificial Life and Robotics | Year: 2011
This article considers what kind of partial agency can be implemented for objects to bring about better agencies for interacting with humans. We humans have the ability to inform our fellows about our intentions, internal states, and requirements through verbal means, gestures, attitudes, timings, and other representations. These representations help us to maintain our belief that we are sufficient agents. Robots and virtual agents also mimic these representations; they act as if they have such an agency. However, their agencies are sometimes too excessive compared to their task. This mismatch leads to a high cognitive load being placed on users and consequently leads to breakdowns in interaction; it prevents human-agent interaction from being a modality in certain applications. We have devised an agency with multiple selectable features. We believe that selectable features promote good designs of virtual agents, robots, machinery, and home appliances according to their intended traits. We categorized these agencies into several groups and discuss what elements lead to these features. The article also describes a method of identifying these features in human behavior. © ISAROB 2011.