日本画像学会誌
Online ISSN : 1880-4675
Print ISSN : 1344-4425
ISSN-L : 1344-4425
54 巻, 6 号
選択された号の論文の13件中1~13を表示しています
Original Paper
  • Hayata AOKI, Koki KODAMA, Chitose MIYAMA, Hiroki OKUDA, Hiroyuki YOKOT ...
    2015 年 54 巻 6 号 p. 526-531
    発行日: 2015/12/10
    公開日: 2015/12/13
    ジャーナル フリー
    We have recently developed screens made of nanomaterial-coated translucent sheets. In these screens, 2D picture images projected on the screen can be transformed automatically into 3D images with stereoscopic backgrounds. The 2D-to-3D transformation is considered to be based on the analogous mechanism that we feel the depth when we see human skin. One of our typical imaging screens consists of three layers made of an aluminum-deposited sheet and two translucent sheets which are coated with titanium dioxide nanoparticles. In this present work, these translucent sheets have been intensively characterized with respect to their optical properties using a CCBTDF instrument. The CCBTDF measurement suggest that the blue light with the short wavelength is scattered on the surface of the first layer, while the red light with the long wavelength permeates to the under layers. We have confirmed that our screen has the analogous optical mechanism of human skin in terms of the color dependence.
Invited paper
  • Tomohiro SEKO, Ikuro FUJINO, Nobuyuki NAKAYAMA
    2015 年 54 巻 6 号 p. 533-541
    発行日: 2015/12/10
    公開日: 2015/12/13
    ジャーナル フリー
    The molecular dynamics simulation technique is advantageous in clarifying the relationship between atomistic structure and properties, which are difficult to measure by experiment;it is a powerful tool for developing electrophotographic materials. On the other hand, problems with applying this technique to larger molecules consist of controlling the calculation time and enlarging the scale of simulation. As a countermeasure, the coarse-grained model, which groups atoms or monomers as one particle, is proposed. First, accuracy and performance are investigated by the coarse-grained united-atom model by applying it to polycarbonate. The united-atom model shows good parallel performance. This model has equivalent accuracy, and an expanded speed and spatial scale of simulation by one digit more than ever before. Next, the united-atom model is applied to charge transfer material, and good calculation accuracy is verified. Finally, the highly coarse-grained Kremer-Grest model is shown to be an additional digit faster than the united-atom model.
  • Takayuki SHODA, Qi GAO, Akiteru FUJII
    2015 年 54 巻 6 号 p. 542-533
    発行日: 2015/12/10
    公開日: 2015/12/13
    ジャーナル フリー
    Since the beginning of 1960s, a lot of organic semiconductors have been developed and used in many applications such as organic photoconductors (OPCs), organic light emitting diodes (OLEDs), organic photovoltaics (OPVs), and organic thin film transistors (OTFTs). To make these applications be commercialized, charge transport property in organic semiconductor should be improved. In the article, we present several computational methods to predict charge transport in organic semiconductor materials at a molecular and a device level. These methods make important roles in understanding the factors influencing charge transport at different circumstances and different scale levels. Furthermore, these methods can be used to improve the charge transport by designing the molecular structures and device architectures.
  • Ikuro FUJINO, Dmitri G. FEDOROV, Kazuo KITAURA, Hidekazu HIROSE, Nobuy ...
    2015 年 54 巻 6 号 p. 554-560
    発行日: 2015/12/10
    公開日: 2015/12/13
    ジャーナル フリー
    When we analyze electronic properties of charge transport materials by quantum chemical simulation, computational cost is high for large molecular systems. A fast quantum chemical simulation method, called fragment molecular orbital (FMO) method, has been applied intensively to biological macromolecules. In order to apply FMO materials, one has to test various fragmentations (division of the molecular system into fragments) and find the best scheme. For biochemical systems, such tests have been previously conducted and in this work, an appropriate fragmentation is reported for charge transport materials. Therefore, we examined the computational efficiency and accuracy of FMO for two types of charge transport materials, in which fragments are standalone molecules and in which fragments are connected by covalent bonds, and verified that our fragment models are adequate for practical use.
  • Mathew D. HALLS, Daisuke YOSHIDOME, Thomas J. MUSTARD, Alexander GOLDB ...
    2015 年 54 巻 6 号 p. 561-569
    発行日: 2015/12/10
    公開日: 2015/12/13
    ジャーナル フリー
    Organic optoelectronic materials are under widespread development to complement or displace existing materials. These materials are selected or designed according to their internal optoelectronic and condensed-phase properties with concern for efficient charge injection and transport, and desired chemical and thermophysical stability. The chemical design space for organic optoelectronic materials is enormous and there is urgent need for the development of computational approaches to help identify the most promising solutions for experimental development, and to advise the selection of materials for use in optimized applications. In this paper we present examples of atomic-scale simulation approaches available to analyze and evaluate potential organic material solutions for diverse applications, with an emphasis on organic light-emitting diode (OLED) materials.
Invited Review
Imaging Highlight
  • 黒木 義彦
    2015 年 54 巻 6 号 p. 619-628
    発行日: 2015/12/10
    公開日: 2015/12/13
    ジャーナル 認証あり
    映像の持つリアリティを高める要素として特に高フレームレートとマイクロ立体視に着目し,心理物理学手法による主観評価実験および脳波計測による客観評価実験を行った.その結果以下のことを確認した.  240fpsのフレームレートは,動画ボヤケやジャーキネス等に対するヒトのほぼ知覚限界をもたらし,こうした動画質劣化の問題を解決する.  立体映像の奥行き感はフレームレートが高くなることに従って,より正しく知覚される.  240fps単眼レンズ光学同時分離型3D光学系を搭載したカメラ,240fps表示装置,映像編集システムを開発した.それらを用いて制作した240fpsマイクロ立体視映像は,滑らかな動きと自然な立体感をもたらす.  240fpsの移動映像刺激に対する脳波は,60fpsの同様の刺激に対する脳波に比較して,実体の移動刺激に対する脳波に近い特性を示す.すなわち高フレームレート映像は,ヒトに対して,自然界を見ている状態に近い脳活動をもたらす.  今後以上のような映像研究の探求を継続しより良い品質の映像の実現に結びつけていく必要があると思われる.
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