Search Results:　 1-20 of 125

  • 1

    Coupled overdamped bistable systems with applications to sensor devices

    In Visarath , Kho Andy , Longhini Patrick , Palacios Antonio

    … Theoretical and experimental works have shown that coupling similar overdamped bistable systems can lead, under certain conditions that depend on the topology of connections and the number of units, to self-induced large-amplitude oscillations that emerge through a global bifurcation of heteroclinic connections between saddle-node equilibria. …

    Nonlinear Theory and Its Applications, IEICE 3(4), 477-496, 2012

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  • 2

    Amplitude Statistics of Sea Clutter by MDL Principle  [in Japanese]

    Sayama Shuji , Ishii Seishiro

    … To investigate sea clutter amplitude statistics, we introduce four probability distribution models and the Minimum Description Length (MDL) principle, which is more rigorous comparison between the distributions than the Akaike Information Criterion (AIC). …

    IEEJ Transactions on Fundamentals and Materials 132(10), 886-892, 2012

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  • 3

    Suppression of Weather Clutter by Means of Log-normal/CFAR Circuit Modified CA LOG/CFAR Circuit  [in Japanese]

    Sayama Shuji , Ishii Seishiro

    … To investigate the weather clutter amplitude statistics, we introduce the Akaike Information Criterion (AIC). …

    IEEJ Transactions on Fundamentals and Materials 132(10), 849-856, 2012

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  • 4

    Developing of Polarimetric GPR Calibration Technique with High-order Terms

    Zou Lilong , Feng Xuan , Zhou Zhengshu , Lu Qi , Liu Cai , Wang Shiyu , Liang Wenjing , Wang Qiao

    … Polarimetric GPR needs accurate channel imbalance and cross-talk data, not only in the amplitude term and but also the phase term. …

    Technical report of IEICE. SANE 111(312), 37-42, 2011-11-17

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  • 5

    Amplitude Statistics of Ground Clutter from Town and Hill Observed by an S-band Radar  [in Japanese]

    SAYAMA Shuji , ISHII Seishiro

    … To investigate such ground clutter amplitude statistics, we introduce a compound distribution and the Akaike Information Criterion (AIC). …

    IEEJ Transactions on Fundamentals and Materials 131(11), 916-923, 2011-11-01

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  • 6

    Amplitude Statistics of Weather Clutter Using S and X-band Radars Analyzed by AIC : Dedicated to Research Associate Seishiro ISHII  [in Japanese]

    佐山 周次

    防衛大学校理工学研究報告 49(1), 77-84, 2011-09-00

  • 7

    Adaptive Noise Suppression Algorithm for Speech Signal Based on Stochastic System Theory

    IKUTA Akira , ORIMOTO Hisako

    … It works in the presence of noise with high amplitude and unknown direction of arrival. … More specifically, an adaptive noise suppression algorithm applicable to real-life speech recognition is proposed without assuming the Gaussian white noise, which performs effectively even though the noise statistics and the fluctuation form of speech signal are unknown. …

    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences 94(8), 1618-1627, 2011-08-01

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  • 8

    Accuracy analysis of echo amplitude distribution model for fibrotic liver  [in Japanese]

    IGARASHI Yu , YAMAGUCHI Tadashi , HACHIYA Hiroyuki

    われわれは,肝炎線維化の定量評価を目的とした新しいエコー信号の解析手法について検討を進めている。本手法では,病変肝からのエコー信号を正常組織と線維組織からの反射信号の2成分と考え,エコー信号の振幅分布を二つのレイリー分布の組み合わせにより表現したモデルを提案している。このモデルを用いることにより,病変肝中の線維組織の質と量に相当するパラメータをエコー信号振幅の統計量から逆問題を解き定量的に求めるこ …

    IEICE technical report. Ultrasonics 110(419), 7-12, 2011-02-14

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  • 9

    Magnetocardiography F-Wave Analysis in Chronic AF Patients

    Kim Doosang , Kim Kiwoong , Lee Yong-Ho , Ahn Hyuk

    … Average cycle length (ms) and amplitude (pT) of type I (n=4) are 165∼173 ms, 0.58 pT and type II (n=15) 114∼122 ms, 0.24 pT. … AF free rate of each type are 100% in type I and 57.1% in type II, but not significantly different in statistics. …

    Journal of Arrhythmia 27(Supplement), PE4_019-PE4_019, 2011

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  • 10

    Noise Removal Method for Speech Recognition by Introducing Stochastic System Model  [in Japanese]

    IKUTA Akira , ORIMOTO Hisako , NAGAMI Yuumi , OHTA Mitsuo

    従来から,音声認識における騒音対策法はいくつか提案されてきたが,本研究では,騒音源の方向が特定できない高騒音環境下において,騒音スペクトルの事前情報やピッチ検出が不要な,単一マイクロホンのみを用いる騒音除去法について検討を行う。具体的には,実環境下での音声認識を可能にするため,騒音変動のガウス性や白色性などの前提を必要とせず,しかも騒音の統計情報が未知でかつ音声の時間的変動形態が未知の場合でも適用 …

    Technical report of IEICE. EA 110(285), 67-72, 2010-11-11

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  • 11

    Sequential Locally Optimum Test (SLOT) : A Sequential Detection Scheme Based on Locally Optimum Test Statistic

    BAE Jinsoo , PARK Seong Ill , KIM Yun Hee , YOON Seokho , OH Jongho , SONG Iickho , OH Seong-Jun

    … Based on the characteristics of the thresholds of two detection schemes employing locally optimum test statistics, a sequential detection design procedure is proposed and analyzed. … It is observed that the SLOT requires smaller average sample numbers than other schemes at most values of the normalized signal amplitude while maintaining the error performance close to the SPRT. …

    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences 93(11), 2045-2056, 2010-11-01

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  • 12

    Mathematical metric of musical noise in arbitrary exponent domain SS

    INOUE Takayuki , TAKAHASHI Yu , SARUWATARI Hiroshi , SHIKANO Kiyohiro , KONDO Kazunobu

    本稿では,高次統計量に基づくミュージカルノイズ評価尺度を用いて,任意乗でのスペクトル減算法のミュージカルノイズ発生量の理論解析を行った結果を述べる.スペクトル減算法のパラメータの一つとして,指数乗ドメインがあり,スペクトル減算法を用いた過去の関連研究において,2乗ドメインでの処理が多いことが調査により明らかになった.先行研究により,ミュージカルノイズの評価尺度を用いて,2乗ドメインにおけるミュージ …

    Technical report of IEICE. EA 110(54), 37-42, 2010-05-19

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  • 13

    Mathematical metric of musical noise in arbitrary exponent domain SS

    INOUE Takayuyki , TAKAHASHI Yu , SARUWATARI Hiroshi , SHIKANO Kiyohiro , KONDO Kazunobu

    本稿では,高次統計量に基づくミュージカルノイズ評価尺度を用いて,任意乗でのスペクトル減算法のミュージカルノイズ発生量の理論解析を行った結果を述べる.スペクトル減算法のパラメータの一つとして,指数乗ドメインがあり,スペクトル減算法を用いた過去の関連研究において,2乗ドメインでの処理が多いことが調査により明らかになった.先行研究により,ミュージカルノイズの評価尺度を用いて,2乗ドメインにおけるミュージ …

    IEICE technical report. Speech 110(56), 37-42, 2010-05-19

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  • 14

    Mathematical metric of musical noise in arbitrary exponent domain SS

    INOUE Takayuyki , TAKAHASHI Yu , SARUWATARI Hiroshi , SHIKANO Kiyohiro , KONDO Kazunobu

    本稿では,高次統計量に基づくミュージカルノイズ評価尺度を用いて,任意乗でのスペクトル減算法のミュージカルノイズ発生量の理論解析を行った結果を述べる.スペクトル減算法のパラメータの一つとして,指数乗ドメインがあり,スペクトル減算法を用いた過去の関連研究において,2乗ドメインでの処理が多いことが調査により明らかになった.先行研究により,ミュージカルノイズの評価尺度を用いて,2乗ドメインにおけるミュージ …

    IEICE technical report. Signal processing 110(55), 37-42, 2010-05-19

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  • 15

    Relativistic Degeneracy Effect on Propagation of Arbitrary Amplitude Ion-Acoustic Solitons in Thomas-Fermi Plasmas

    ESFANDYARI-KALEJAHI Abdolrasoul , AKBARI-MOGHANJOUGHI Massoud , SABERIAN Ehsan

    … Arbitrary amplitude ion-acoustic solitary waves (IASWs) are studied using Sagdeev-Potential approach in electron-positron-ion plasma with ultra-relativistic or non-relativistic degenerate electrons and positrons and the matching criteria of existence of such solitary waves are numerically investigated. … It has been shown that the relativistic degeneracy of electrons and positrons has significant effects on the amplitude and the Mach-number range of IASWs. …

    Plasma and Fusion Research 5, 045-045, 2010

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  • 16

    A Study on Characteristics of Rain Attenuation Variation for Each Rain Type in Ka-band Satellite Communication

    SAWAI Koichi , MAEKAWA Yasuyuki

    1997〜2007年の間に、大阪電気通信大学(寝屋川市)において1秒間隔(一部0.1秒間隔)で連続的に測定されたKa帯衛星電波の受信レベルデータを用いて、その降雨減衰の変動特性について降雨タイプ別による詳しい解析を行った。降雨減衰の継続時間や変化速度(フェードスロープ)の長期統計結果は、全般的にITU-R勧告による予測値とよい一致が得られた。降雨タイプ別にみると、ITU-R勧告値は降雨継続時間につ …

    Technical report of IEICE. SAT 109(254), 149-154, 2009-10-22

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  • 17

    Turbulent Structures of Stably Stratified Poiseuille Flow under Temperature Oscillation at Wall  [in Japanese]

    TAKASHIMA Yoshihiro , IIDA Oaki , NAGANO Yasutaka

    … Without temperature oscillation, turbulence statistics remain steady, while in the case with the temperature oscillation, they become unsteady and quasi-laminar state appears periodically in one side of a channel. … Moreover, we find that this laminarization is strongly affected by the period and amplitude of the oscillation of the wall temperature. …

    Proceedings, ... meeting of Japan Society of Fluid Mechanics 2009, 57, 2009-09-02

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  • 18

    Amplitude statistics of weather clutter using S-band and X-band radars (dedicated to Professor Yozo Utsumi)  [in Japanese]

    今村 真美 , 石井 誠四郎 , 佐山 周次

    防衛大学校理工学研究報告 47(1), 39-45, 2009-09-00

  • 19

    Spatial structures and statistics of atmospheric gravity waves derived using a heuristic vertical cross-section extraction from COSMIC GPS radio occultation data

    Horinouchi Takeshi , Tsuda Toshitaka

    … A positive skewness was found in the probability distribution of the GW amplitude in middle to high latitudes, while the distribution was not skewed in low latitudes. … The GW amplitude had a negative correlation with zonal wind shear. …

    Journal of geophysical research. Atmospheres 114, D16110, 2009-08-00

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  • 20

    Some Statistics of Stochastic Jump Phenomena of a Duffing Oscillator to Narrow Band Random Excitation(Mechanical Systems)  [in Japanese]

    TAMURA Shinji , SUZUKI Yasuhiro , KIMURA Koji

    … Statistics of stochastic jump phenomena in the random responses of a Duffing oscillator subjected to narrow band random excitation are investigated. … These responses differ in the phase angle between the excitation and the response, as well as the amplitude. …

    Transactions of the Japan Society of Mechanical Engineers. C 75(754), 1560-1567, 2009-06-25

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