検索結果 772件中 1-20 を表示

  • 高次要素を用いた圧力安定化 Lagrange-Galerkinスキームによる高レイノルズ数流れ問題の数値計算

    内海 晋弥

    計算工学講演会論文集 Proceedings of the Conference on Computational Engineering and Science 22, 4p, 2017-05

  • 女性研究者のためのフェローシップの創設 : アメリカ女性大学人協会(AAUW) とフェローシップ・キャンペーン

    坂本 辰朗 , Tatsuro Sakamoto

    … This scheme had deep historical significance. … The 1920s was the first expansion period of higher education in the history of the United States. … This was true also for women's higher education opportunities, and the proportion of women amongst undergraduate students reached 47% in 1920. … In order to procure its target of a 1-million-dollar fund, the AAUW headquarters divided the whole country into units, each responsible for fundraising. …

    教育学論集 (68), 3-18, 2017-03-31

    機関リポジトリ

  • Low Complexity Log-Likelihood Ratio Calculation Scheme with Bit Shifts and Summations

    AOKI Takayoshi , MATSUGI Keita , SANADA Yukitoshi

    … <p>This paper presents an approximated log-likelihood ratio calculation scheme with bit shifts and summations. … Our previous work yielded a metric calculation scheme that replaces multiplications with bit shifts and summations in the selection of candidate signal points for joint maximum likelihood detection (MLD). … In this paper, an approximated log-likelihood ratio calculation scheme that substitutes bit shifts and summations for multiplications is proposed. …

    IEICE Transactions on Communications, 2017

    J-STAGE

  • Application of ALE to nonlinear wave radiation by a non-wall-sided structure

    Zhang Jie , Kashiwagi Masashi

    … In order to track an exact position of the free surface, Arbitrary Lagrangian-Eulerian (ALE) scheme is used in the computation. … The feature of ALE scheme is that by introducing a prescribed path (curve) for each fluid marker on the free surface, the movement of fluid marker representing the deformation of free surface is confined along a path. …

    日本船舶海洋工学会論文集 25(0), 109-121, 2017

    J-STAGE

  • Experimental Investigation of Space Division Multiplexing on Massive Antenna Systems for Wireless Entrance

    MARUTA Kazuki , OHTA Atsushi , KUROSAKI Satoshi , ARAI Takuto , IIZUKA Masataka

    … <p>This paper experimentally verifies the potential of higher order space division multiplexing in line-of-sight (LOS) channels for multiuser massive MIMO. … We previously proposed an inter-user interference (IUI) cancellation scheme and a simplified user scheduling method for Massive Antenna Systems for Wireless Entrance (MAS-WE). …

    IEICE Transactions on Communications E100.B(8), 1436-1448, 2017

    J-STAGE

  • Frame Popularity-Aware Loss-Resilient Interactive Multi-View Video Streaming

    FUJIHASHI Takuya , HIROTA Yusuke , WATANABE Takashi

    … The main idea of FP-MVS is to assign intra (I) frames in the prediction structure for less/more popular (i.e., few/many observed users) potential frames in order to mitigate the impact of a frame loss. … Evaluations using Joint Multi-view Video Coding (JMVC) demonstrated that FP-MVS achieves higher video quality even in loss-prone environments. … For example, our scheme improves video quality by 11.81dB compared to the standard multi-view video encoding schemes at the loss rate of 5%.</p> …

    IEICE Transactions on Communications E100.B(4), 646-656, 2017

    J-STAGE

  • 自由曲面単層ラチスシェルの座屈耐力最大化に関する研究

    滝内 雄二 , 加藤 史郎 , 中澤 祥二

    …  In this paper, a scheme of shape optimization is proposed for obtaining the maximum strength of free-form steel reticulated shells. … In order to discuss the effectiveness of objective functions with respect to the strength, several different optimizations using GA are applied to two roof structures. …

    日本建築学会構造系論文集 82(733), 441-450, 2017

    J-STAGE

  • Multi-Beam Massive MIMO Using Constant Modulus Algorithm for QAM Signals Employing Amplitude and Phase Offset Compensation

    TANIGUCHI Ryotaro , NISHIMORI Kentaro , MAKINO Hideo

    … In this paper, in order to achieve the further higher transmission rate, the amplitude and phase compensation scheme is proposed when using the CMA with amplitude and phase modulation scheme such as QAM. …

    IEICE Transactions on Communications E100.B(2), 262-268, 2017

    J-STAGE

  • Experimental Investigation of Space Division Multiplexing on Massive Antenna Systems for Wireless Entrance

    MARUTA Kazuki , OHTA Atsushi , KUROSAKI Satoshi , ARAI Takuto , IIZUKA Masataka

    … <p>This paper experimentally verifies the potential of higher order space division multiplexing in line-of-sight (LOS) channels for multiuser massive MIMO. … We previously proposed an inter-user interference (IUI) cancellation scheme and a simplified user scheduling method for Massive Antenna Systems for Wireless Entrance (MAS-WE). …

    IEICE Transactions on Communications, 2017

    J-STAGE

  • Effects of Electron–Hole Asymmetry on Magnetic Response in Graphene

    Ando Tsuneya , Suzuura Hidekatsu

    Journal of the Physical Society of Japan 86(1), 2016-12-14

    日本物理学会

  • Demonstration of photon–photon resonance peak enhancement by waveguide configuration modification on active multimode interferometer laser diode

    Kitano Takuya , Uddin Mohammad , Hong Bingzhou , Tajima Akio , Jiang Haisong , Hamamoto Kiichi

    … however, there is the difficulty that an even higher frequency response occurs in only carrier-photon resonance. … In order to obtain an even higher PPR frequency, we have investigated the control scheme of enhancing PPR. … In this work, we compared two types of active-MMI waveguide structures to confirm the scheme. …

    Jpn. J. Appl. Phys. 55(8S3), 08RD04, 2016-07-21

    応用物理学会

  • C-1-2 感光体ドラム駆動に対応した高精度遊星歯車における周期変動補正制御技術(情報・精密機器のサーボ・スマート制御(1),口頭発表)

    松田 裕道 , 高橋 元春

    … In order to obtain high image quality at low cost, driving technology using plastic gear to keep the PC velocity constant is needed. … A feedback (FB) and feedforward (FF) controller is adapted to achieve ever higher performance. … The proposed control strategy reject the periodic disturbance based on switching scheme and open-loop observer. …

    IIP情報・知能・精密機器部門講演会講演論文集 2016, "C-1-2-1"-"C-1-2-4", 2016-03-14

  • Finite amplitude method applied to the giant dipole resonance in heavy rare-earth nuclei

    Oishi Tomohiro , Kortelainen Markus , Hinohara Nobuo

    … Recently, the finite amplitude method (FAM) was developed in order to perform the QRPA calculations efficiently without any truncation on the two-quasiparticle model space.Purpose: We discuss the nuclear giant dipole resonance (GDR) in heavy rare-earth isotopes, for which the conventional matrix diagonalization of the QRPA is numerically demanding. …

    Physical review C 93(3), 034329, 2016-03

    機関リポジトリ DOI

  • Numerical Modeling of Photon Migration in Human Neck Based on the Radiative Transport Equation

    Fujii Hiroyuki , Okawa Shinpei , Nadamoto Ken , Okada Eiji , Yamada Yukio , Hoshi Yoko , Watanabe Masao

    … For improvement of the optical imaging, this study develops a higher order scheme for solving the time-dependent radiative transport equation (RTE) by use of the finite-difference and discrete-ordinate methods. … The accuracy and efficiency of the developed scheme are examined by comparison with the analytical solutions of the RTE in homogeneous media. … Then, the developed scheme is applied to describing photon migration in the human neck model. …

    Journal of Applied Nonlinear Dynamics 5(1), 117-125, 2016-03

    機関リポジトリ DOI

  • OFDMシステムにおけるインパルス雑音の影響軽減法 (放送技術)

    安井 宏友 , 中村 聡 , 伊丹 誠

    OFDMシステムの特性劣化の要因の1つにインパルス雑音が挙げられる.インパルス雑音は時間幅が短く振幅が非常に大きい雑音のため,OFDMのすべての搬送波に影響が及んでしまう.したがって,受信機においてインパルス雑音の影響を軽減する必要がある.軽減方式の中には,時間サンプルの再生成を行い,インパルス雑音が加わった時間サンプルと入れ替えることによって,影響を軽減する方式が提案されている.しかし,この方式 …

    映像情報メディア学会技術報告 = ITE technical report 40(4), 1-4, 2016-02

  • OFDMシステムにおけるインパルス雑音の影響軽減法(学生・若手発表および一般)

    安井 宏友 , 中村 聡 , 伊丹 誠

    OFDMシステムの特性劣化の要因の1つにインパルス雑音が挙げられる.インパルス雑音は時間幅が短く振幅が非常に大きい雑音のため,OFDMのすべての搬送波に影響が及んでしまう.したがって,受信機においてインパルス雑音の影響を軽減する必要がある.軽減方式の中には,時間サンプルの再生成を行い,インパルス雑音が加わった時間サンプルと入れ替えることによって,影響を軽減する方式が提案されている.しかし,この方式 …

    映像情報メディア学会技術報告 40.4(0), 1-4, 2016

    J-STAGE

  • One-Bit to Four-Bit Dual Conversion for Security Enhancement against Power Analysis

    LEE Seungkwang , JHO Nam-Su

    … In this sense, software countermeasures including higher-order masking or software dual-rail with precharge logic have been proposed to produce randomized or constant power consumption during the key-dependent operations. … For an exemplary embodiment of the proposed scheme, we apply it to an AES implementation and demonstrate its security and performance. …

    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences E99.A(10), 1833-1842, 2016

    J-STAGE

  • Frame Popularity-aware Loss-resilient Interactive Multi-view Video Streaming

    FUJIHASHI Takuya , HIROTA Yusuke , WATANABE Takashi

    … The main idea of FP-MVS is to assign intra (I) frames in the prediction structure for less/more popular (i.e., few/many observed users) potential frames in order to mitigate the impact of a frame loss. … Evaluations using Joint Multi-view Video Coding (JMVC) demonstrated that FP-MVS achieves higher video quality even in loss-prone environments. … For example, our scheme improves video quality by 11.81 dB compared to the standard multi-view video encoding schemes at the loss rate of 5%.</p> …

    IEICE Transactions on Communications, 2016

    J-STAGE

  • 差分格子ボルツマン法における高次の非線形スキーム(チャンネル乱流のDNSによる評価)

    國嶋 雄一 , 梶島 岳夫 , 蔦原 道久

    … Thus the performance of FDLBM is mostly affected by the finite-difference scheme for the advection terms of LBM, which has to be an upwind one from a stand point of numerical stability. … Particularly in this study, the influences of the the order of accuracy and upwind method are assessed by the direct numerical simulation of fully-developed turbulent flow in a plane channel. …

    日本機械学会論文集 82(840), 16-00204-16-00204, 2016

    J-STAGE

  • 高精度自由表面境界モデルを用いた粒子法のスロッシング現象への適用

    鶴田 修己 , 後藤 仁志 , 鈴木 高二朗 , Khayyer Abbas , 下迫 健一郎 , 五十里 洋行

     堤体に作用する高波などの非定常性の高い波・流れは境界条件によって容易かつ複雑にその様相が変化するため,設計波力の算定において,境界条件の設定が簡便な数値波動水槽による水理実験計測の代替・補助的活用が期待される.完全ラグランジュ型手法である粒子法は,流動粒子の挙動を移流項の数値拡散無く追跡が可能であり,高精度スキームの発展に伴って非定常波浪場への適用事例が増えつつある.一方で,粒子法における精度確 …

    土木学会論文集B2(海岸工学) 72(2), I_49-I_54, 2016

    J-STAGE

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