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/Ge gate stacks and its impact on electrical propertiesHosoi, Takuji*; Hideshima, Iori*; Minoura, Yuya*; Tanaka, Ryohei*; Yoshigoe, Akitaka; Teraoka, Yuden; Shimura, Takayoshi*; Watanabe, Heiji*
Shingaku Giho, 113(87), p.19 - 23, 2013/06
An understanding of the mechanisms responsible for formation or decomposition of GeO
interlayer and Ge diffusion into high- layer is important to develop advanced metal/high- gate stacks for Ge MOSFETs. In this work, we fabricated HfO
/GeO/Ge gate stacks by 
oxidation of thin metal Hf layers on Ge substrates. The effect of plasma oxidation on the change in the bonding states of Ge atoms in HfO/GeO/Ge gate stacks and the structural changes induced by metal electrode deposition and thermal annealing was systematically investigated by synchrotron radiation photoemission spectroscopy (SR-PES) and electrical characterization.
Miyamura, Hiroko; Hu, H.-Y.*; Yoshida, Masahiro*; Ozahata, Satoshi*; Nakao, Akihiro*; Takahashi, Shigeo*
Shingaku Giho, 112(463), p.577 - 582, 2013/03
This report presents a method for visualizing scale-free networks including Overlay networks as an typical example. Visualizing large-scale and complicated networks such as social networks has recently been very popular while conventional network visualization techniques cannot allow us to understand the topological structure of the scale-free networks. This is because the vertex degrees vary at an exponential rate in the scale-free network and thus special attention should be given when visualizing the network connectivity and analyzing the network traffic there. In this report, we employ the hierarchical representation of the scale-free network by referring to their vertex degrees and autonomous system relationships, so that we can clearly visualize the topological structure of the network in 3D space and retrieve the traffic paths over the network.
Ono, Shinya*; Inoue, Kei*; Morimoto, Masahiro*; Arae, Sadanori*; Toyoshima, Hiroaki*; Yoshigoe, Akitaka; Teraoka, Yuden; Ogata, Shoichi*; Yasuda, Tetsuji*; Tanaka, Masatoshi*
Shingaku Giho, 111(114), p.23 - 27, 2011/07
The initial oxidation on high-index silicon surfaces with (113) and (120) orientations at 820 K has been investigated by real-time X-ray photoemission spectroscopy (Si 2p and O 1s) using 687 eV photons. The time evolutions of the Si
(n=1-4) components in the Si 2p spectrum indicate that the Si
state is suppressed on high-index surfaces compared with Si(001). The O 1s state consists of two components, a low-binding-energy component (LBC) and a high-binding-energy component (HBC). It is suggested that the O atom in strained Si-O-Si contributes to the LBC component. The reaction rates are slower on high-index surfaces compared with that on Si(001).
Miyamura, Hiroko; Ozahata, Satoshi*; Nakao, Akihiro*; Kawashima, Konosuke*
Shingaku Giho, 110(190), p.103 - 108, 2010/09
In this paper, we propose a visualization technique for handling large-scale experiment datasets in distributed file system. Traditional network visualization techniques have problem that not all data can be displayed at the same time because the file-sharing network data is too large-scale. Therefore, we propose a concept of adaptive network graph display, in which the graph style can be changed according to the details of user's observation. We construct a visualization system based on this concept. When observing data globally, the proposed system selectively displays information based on the clustering result, and when observing data locally, the system displays detailed information. This technique is a basic technology for computational science to achieve large-scale datasets handling which is a problem in atomic energy related fields.
Miyamura, Hiroko; Ozahata, Satoshi*; Nakao, Akihiro*; Kawashima, Konosuke*; Suzuki, Yoshio
Shingaku Giho, 109(448), p.357 - 362, 2010/03
We propose a visualization system for file-sharing network data. The file-sharing networks have some problems, for example: the contents distribution of the copyright infringement files, an increase in the amount of traffic, and so on. To handle these problems, techniques for observing the network state and controlling the file sharing are proposed. In addition, the proposed techniques realize effective control by giving retrieval control to the key nodes, which are important roles in the file-sharing network.
Miyamura, Hiroko; Ozahata, Satoshi*; Nakao, Akihiro*; Kawashima, Konosuke*; Suzuki, Yoshio
Shingaku Giho, 109(188), p.85 - 90, 2009/09
We propose a network visualization method for a large-scale file-sharing network dataset. The network dataset has nodes and links that represent the connection between two nodes. When the number of links is large, it is difficult to recognize the structure of the network data, because many links are crossed. In this context, for recognizing the structure and exploring the key nodes, we propose a link-less network visualization method using matrix based representation. In addition, we demonstrate the effectiveness of the proposed method by applying it to the file-sharing network log data.
Makino, Takahiro*; Yanagawa, Yoshimitsu*; Kobayashi, Daisuke*; Fukuda, Seisuke*; Hirose, Kazuyuki*; Ikeda, Hirokazu*; Saito, Hirobumi*; Onoda, Shinobu; Hirao, Toshio; Oshima, Takeshi; et al.
Shingaku Giho, 108(100), p.67 - 72, 2008/06
SET pulse-widths were measured as a function of LET by using pulse capture circuits. In addition, a scan flip-flop (FF) is designed to observe both single event transient (SET) and single event upset (SEU) soft errors in logic VLSI system.
Yamamoto, Yoshihisa*; Togashi, Hideaki*; Konno, Atsushi*; Matsumoto, Mitsutaka*; Kato, Atsushi*; Saito, Eiji*; Suemitsu, Maki*; Teraoka, Yuden; Yoshigoe, Akitaka
Shingaku Giho, 108(80), p.65 - 70, 2008/06
The growth process of thermal oxides on Si(110) surface and the development of their interfacial bonding structures have been investigated by using real-time synchrotron radiation photoemission spectroscopy. As a result, it was clarified that the Si
component in the Si 2p core-level spectra is always much higher than that of Si
for 0-1 mono-layer (ML) oxides on Si(110) surface. Observations on the time-evolution of the O 1s core-level spectrum indicates that the autocatalytic-reaction model proposed for the Si(001) oxidation can be also applicable to the Si(110) oxidation.
Ando, Yuichiro*; Ueda, Koji*; Kumano, Mamoru*; Sado, Taizo*; Narumi, Kazumasa; Maeda, Yoshihito; Miyao, Masanobu*
Shingaku Giho, 107(111), p.221 - 224, 2007/06
Ferromagnetic silicide Fe
Si (Currie temperature: 840 K) has three phases (A2, B2, and DO3), where the DO3-type is an ordered phase and calculated to be spin-polarized at the Fermi level. In addition, the lattice constant (0.565 nm) of FeSi is almost completely equal to that (0.565 nm) of Ge. Therefore, atomically controlled epitaxial growth of FeSi is expected on Ge. This will be a powerful tool to realize Ge channel spin transistors with ultrahigh speed operation and ultralow power consumption. This paper reviews our recent progress in novel epitaxial growth of FeSi on Ge for spintronics application.
Kasugai, Atsushi; Takahashi, Koji; Kobayashi, Noriyuki; Kariya, Tsuyoshi*; Mitsunaka, Yoshika*; Sakamoto, Keishi
Shingaku Giho, 106(200), p.77 - 82, 2006/08
no abstracts in English
Yamakawa, Koichi
Shingaku Giho, 106(90), p.49 - 52, 2006/06
no abstracts in English
Suemitsu, Maki*; Kato, Atsushi*; Togashi, Hideaki*; Konno, Atsushi*; Yamamoto, Yoshihisa*; Teraoka, Yuden; Yoshigoe, Akitaka; Narita, Yuzuru*
Shingaku Giho, 106(108), p.61 - 63, 2006/06
no abstracts in English
Minami, Ryutaro; Kasugai, Atsushi; Takahashi, Koji; Kobayashi, Noriyuki; Kariya, Tsuyoshi*; Mitsunaka, Yoshika*; Hayashi, Kenichi*; Sakamoto, Keishi
Shingaku Giho, 105(498), p.39 - 42, 2005/12
no abstracts in English
Kasugai, Atsushi; Minami, Ryutaro; Takahashi, Koji; Kobayashi, Noriyuki*; Kariya, Tsuyoshi*; Mitsunaka, Yoshika*; Hayashi, Kenichi*; Sakamoto, Keishi
Shingaku Giho, 104(520), p.37 - 42, 2004/12
no abstracts in English
multilayered films and RE-TM amorphous filmsAgui, Akane; Mizumaki, Masaichiro*
Shingaku Giho, 104(409), p.7 - 10, 2004/11
no abstracts in English
Suzudo, Tomoaki
Shingaku Giho, 103(740), p.55 - 60, 2004/03
A class of asynchronous cellular automata with mass conservation realized by partitioning technique is introduced. This class of cellular automata can be used as a kind of molecular dynamic system and is suitable for searching for its rule by genetic algorithms. This paper discusses the usefulness of these cellular automata for the analyses and simulations of emergent spatial pattern formation in the physical/chemical systems.
thin filmsFujita, Naoki*; Lee, H.-S.*; Okada, Hiroshi*; Wakahara, Akihiro*; Yoshida, Akira*; Oshima, Takeshi; Ito, Hisayoshi
Shingaku Giho, 102(77), p.79 - 84, 2002/05
no abstracts in English
Maebara, Sunao; Morimoto, Iwao*; Zheng, X.*; Watanabe, Akihiko*; Yamamoto, Masanori*; Sakamoto, Keishi; Shiho, Makoto
Shingaku Giho, 101(415), p.61 - 66, 2001/11
no abstracts in English
Shoyama, Hiroaki; Sakamoto, Keishi; Hayashi, Kenichi*; Kasugai, Atsushi; Takahashi, Koji; Tsuneoka, Masaki; Ikeda, Yukiharu; Kariya, Tsuyoshi*; Mitsunaka, Yoshika*; Imai, Tsuyoshi
Shingaku Giho, 100(506), p.39 - 44, 2000/12
no abstracts in English
Maebara, Sunao; Morimoto, Iwao*; Shiho, Makoto
Shingaku Giho, 100(405), p.61 - 64, 2000/11
no abstracts in English
