Search Results:　 1-20 of 400

  • 1

    Study on the Classification of Paddy Fields Based on Time-Frequency Analysis of NDVI  [in Japanese]

    Hatanaka Katsumori , Suzuki Mitsuo , Kanada Norikazu

    本研究では,衛星リモートセンシングより得られる正規化植生指数(NDVI)を時系列に整備し,NDVI波形を一次元離散ウェーブレット変換により時間周波数応答解析し,ウェーブレットパワーをはじめとする各種パラメータを用いた線形判別関数を導出することで,土地利用分類を自動的に行うための手法を提案する。特に,水稲の生育状況変化に対応した波形特徴を抽出し,水稲作付面積を自動的に推定する手法を提案する。解析対象 …

    Journal of agricultural science, Tokyo Nogyo Daigaku 56(1), 36-43, 2011-06-20

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  • 2

    429 Effect of Living Sound on the Sound Insulation Performance of a Ventilation Opening Using Active Noise Control : Discrimination Technique of Aircraft Noise from Living Sound Based on Frequency Characteristics  [in Japanese]

    SHIBATA Takuro , ANAI Ken , FUJIMOTO Kazutoshi

    日本建築学会研究報告. 九州支部. 2, 環境系 (50), 113-116, 2011-03-01

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  • 3

    Rapid Analysis Method for Type of Oil Discharged into Sea Areas  [in Japanese]

    TAKI Masato , OTOMO Naoko , OTANI Hisako , TOMIYA Shingo , UNO Toshiaki , NAGAI Masatoshi

    海域に排出され環境汚染物質である軽油と重油の迅速な油種分析法を提案する。本法は赤外分光光度法を使用し，ナフタレン類の吸収811 cm−1（C-Hの2個の隣接した水素面外変角振動），742 cm−1（C-Hの4個の隣接した水素面外変角振動）および723 cm−1（メチレン基の骨格振動）を識別指標に用いた。その結果，811，742，723 cm−1の各吸収の大きさは，軽油が742＜811＜723 cm …

    Journal of the Japan Petroleum Institute 54(2), 103-107, 2011-03-01

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  • 4

    A Study on Speaker Discrimination by Wavelet Analysis  [in Japanese]

    SUGIYAMA Koutarou , JEONG Man-Yong

    … Therefore, this study adoptsthe Wavelet analysis, which has been using widely to analyze transient signals on Time-Frequency domain. …

    Memoirs of Numazu College of Technology 45, 119-122, 2011-01-31

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  • 5

    Examination of Stimulation for Brain-Computer Communication System : Frequency and Number of Stimuli  [in Japanese]

    YAHATA Masatomo , IGASAKI Tomohiko , HAYASHIDA Yuuki , MURAYAMA Nobuki

    電気学会研究会資料. MBE, 医用・生体工学研究会 2011(1), 17-21, 2011-01-27

  • 6

    Examination of Stimulation for Brain-Computer Communication System : Frequency and Number of Stimuli  [in Japanese]

    YAHATA Masatomo , IGASAKI Tomohiko , HAYASHIDA Yuuki , MURAYAMA Nobuki

    われわれは視覚刺激に対する脳波の応答から被験者が選択した刺激を推定することで意思伝達を行う「ブレイン・コンピュータ・コミュニケーションシステム」の開発研究を行っている.本稿では,刺激にかかる時間を固定し,刺激の頻度と回数を変化させた場合のtarget弁別率の変化について検討した.その結果,刺激の頻度と回数が変化しても成功率は変化しないことがわかった.これにより,target弁別率は刺激の頻度ではな …

    IEICE technical report. ME and bio cybernetics 110(399), 17-21, 2011-01-20

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  • 7

    Polarization and Spatial Statistics of Wideband MIMO Relay Channels in Urban Environment at 2.35GHz

    NIE Xin , ZHANG Jianhua , ZHANG Ping

    … First of all, the channels were measured employing a real-time channel sounder in IMT-Advanced frequency band (2.35GHz with 50MHz bandwidth). … The trends of power azimuth spectrum (PAS) and cross-polarization discrimination (XPD) with the separation between the RS and the MS are investigated. …

    IEICE Transactions on Communications 94(1), 139-149, 2011-01-01

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  • 8

    Discrimination Method of Pop-up Conditions according to PC Usage Situation for Dissemination of Business Information

    Matsumoto Toshiko , Onoyama Takashi , Akiyoshi Masanori

    … Based on observation of typical phrases and increase of frequencies for characteristic phrases in contents of business-use applications, we select suppression keywords according to their frequency in positive and negative cases and their occurrence in feedback document. …

    IEEJ Transactions on Electronics, Information and Systems 131(10), 1819-1827, 2011

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  • 9

    An Approach Using Combination of Multiple Features through Sigmoid Function for Speech-Presence/Absence Discrimination

    WANG Kun-Ching , CHIN Chiun-Li

    … Next, the feature parameters are derived from the selected frequency sub-band to form robust voice feature parameters. … In order to discard the seriously corrupted frequency sub-band, a strategy of adaptive frequency sub-band extraction (AFSE) dependant on the sub-band SNR is then applied to only the frequency sub-band used. …

    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences E94.A(8), 1630-1637, 2011

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  • 10

    Imaging Radio-Frequency Power Distributions by an EBG Absorber

    YAGITANI Satoshi , KATSUDA Keigo , NOJIMA Masayuki , YOSHIMURA Yoshiyuki , SUGIURA Hirokazu

    … A thin electromagnetic band-gap (EBG) absorber is employed to capture the 2-d image of radio-frequency (RF) power distribution. … Around the resonance frequency at which the EBG structure acts as a high-impedance surface, the RF power incident on the surface is absorbed by the lumped resistors which are matched with the incident wave impedance. …

    IEICE Transactions on Communications E94.B(8), 2306-2315, 2011

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  • 11

    Recognition for variable information in scenes

    Kasai Yuriko , Kawabata Yasuhiro

    … In Experiment 1, discrimination performance between the test scene and its variation was measured using the constant stimuli method. … The results showed that discrimination between the test scene and its variation was worse, but the distracters were easily discriminated. … Variations in the viewing field had the most detrimental effect on discrimination performance. …

    The Japanese journal of psychology 81(6), 610-618, 2011

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  • 12

    Discrimination of Multiple Sources of 3D Biomagnetic Field using Frequency and Phase Analyses

    Iwasaki H. , Tanaka K. , Katayama S. , Uchikawa Y. , Kobayashi K.

    …   This paper describes the usefulness of 3D biomagnetic field measurements for discriminating multiple sources closely located and overlapped in time such as in magnetocardiogram(MCG) and magnetoencephalogram (MEG), using frequency and phase analysis. …

    Journal of the Magnetics Society of Japan advpub(0), 1104220410, 2011

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  • 13

    Examination of brain-computer interface with multi-possible-choices by single 10Hz blinking photic stimulus using a transient VEP analysis  [in Japanese]

    YAMANISHI Nao , ITAKURA Naoaki , MITO Kazuyuki

    一般的に視覚誘発電位(VEP)を用いた脳波インタフェースは,10Hz前後の周波数を用いた光点滅刺激により誘発されるsteady-state型VEPのピーク周波数を判別することによって実現される.従って,異なる周波数で選択肢数と同数の光点滅刺激が必要となるが,VEPを誘発する光点滅周波数には限りがある.本研究では,単一10Hz光点滅刺激だけによって3つの選択肢を持つ脳波インタフェースの実現性を検討し …

    IEICE technical report. ME and bio cybernetics 110(294), 47-50, 2010-11-11

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  • 14

    Spatiotemporal characteristics of color motion detection during pursuit eye movements  [in Japanese]

    SEGAWA Daiki , MATSUMIYA Kazumichi , KURIKI Ichiro , SHIOIRI Satoshi

    運動検出には大細胞経路と小細胞経路の両経路が関わっていると考えられていて、前者は輝度変化の運動信号にのみ、後者は色変化の運動信号にも基づき運動情報を処理する.本研究では、追従眼球運動の動きの知覚への両経路の影響を調査する.先行研究において,色刺激や高空間周波数の輝度刺激に比べて低空間周波数の刺激に対して追従眼球運動中の検出感度の顕著な低下が報告されている.本研究では,この追従眼球中の検出感度の低下 …

    IEICE technical report. ME and bio cybernetics 110(294), 31-35, 2010-11-11

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  • 15

    742 A Study on Speaker Discrimination by Wavelet Analysis  [in Japanese]

    SUGIYAMA Koutarou , JEONG Man-Yong

    … Therefore, this study adopts the Wavelet analysis, which has been using widely to analyze transient signals on Time-Frequency domain. …

    Dynamics & Design Conference 2010, "742-1"-"742-4", 2010-09-14

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  • 16

    A Low-Complexity Sparse Channel Estimation Method for OFDM Systems

    SHENG Bin , ZHU Pengcheng , YOU Xiaohu , CHEN Lan

    … In this letter, we propose a low-complexity sparse channel estimation method for orthogonal frequency division multiplexing (OFDM) systems. … The proposed method uses a discrete Fourier transform (DFT)-based technique for channel estimation and a novel sorted noise space discrimination technique to estimate the channel length and tap positions. …

    IEICE Transactions on Communications 93(8), 2211-2214, 2010-08-01

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  • 17

    Distinguishing Buried Objects in Extremely Shallow Underground by Frequency Response Using Scanning Laser Doppler Vibrometer

    Abe Touma , Sugimoto Tsuneyoshi

    … Standardization and brightness imaging are used as methods of discrimination. …

    Jpn J Appl Phys 49(7), 07HC15-07HC15-4, 2010-07-25

    The Japan Society of Applied Physics

  • 18

    Signal Monitoring Techniques with Digital Spectrum Processing Using Pseudo-Return-to-Zero Modulation  [in Japanese]

    ARIKAWA Manabu , LE TAILLANDIER DE GABORY Emmanuel , FUJITA Sadao , MAEDA Wakako , FUKUCHI Kiyoshi

    物理層における信号モニタリング技術は、安定した制御ループ系を構築し、複雑なシステムを動作させるために重要である。我々は、デジタル信号処理を用いたコヒーレント受信系において、擬似RZ変調方式(PRZ)による低周波のスペクトル成分を利用した光信号モニタリング技術を提案する。112Gb/s偏波多重PRZ-QPSK信号を使用したシミュレーションと実験により、偏波識別、偏波間スキューおよび波長分散の広範囲で …

    Technical report of IEICE. OCS 110(152), 41-46, 2010-07-22

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  • 19

    Improvement of speech recognition performance based on the conversion of Lombard features  [in Japanese]

    UEMURA Yuji , MORISE Masanori , NISHIURA Takanobu

    近年,音声認識技術の飛躍的な発達に伴い,音声認識を活用した音声情報案内システム等が利用されるようになりつつある.しかし,騒音環境下での音声認識性能は,十分なSNRが確保できないことや,ロンバード効果と呼ばれる発話変形により低下するという問題がある.ロンバード効果とは,十分な聴覚フィードバックが確保できないときに生じ,基本周波数やフォルマント周波数等,音声認識に用いる特徴量に変化が生じる現象を示す. …

    Technical report of IEICE. EA 110(54), 1-6, 2010-05-19

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  • 20

    Improvement of speech recognition performance based on the conversion of Lombard features  [in Japanese]

    UEMURA Yuji , MORISE Masanori , NISHIURA Takanobu

    近年,音声認識技術の飛躍的な発達に伴い,音声認識を活用した音声情報案内システム等が利用されるようになりつつある.しかし,騒音環境下での音声認識性能は,十分なSNRが確保できないことや,ロンバード効果と呼ばれる発話変形により低下するという問題がある.ロンバード効果とは,十分な聴覚フィードバックが確保できないときに生じ,基本周波数やフォルマント周波数等,音声認識に用いる特徴量に変化が生じる現象を示す. …

    IEICE technical report. Speech 110(56), 1-6, 2010-05-19

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