Search Results 1-20 of 157

  • Coupling of Two Microbeads Exhibiting Different Features of Oscillations in the Belousov-Zhabotinsky Reaction

    Kuze Masakazu , Hiranishi Yuri , Okamoto Yasunao , Shioi Akihisa , Nakata Satoshi

    … <p>We analyzed the coupling of chemical oscillations between cation-exchange resin beads loaded with a metal catalyst for the Belousov-Zhabotinsky (BZ) reaction. … We observed two different oscillatory behaviors, i.e. global oscillations (GO) and traveling waves (TW). …

    Chemistry Letters 48(8), 847-850, 2019

    J-STAGE 

  • Association of phase coupling of respiratory sinus arrhythmia with slow wave brain activity  [in Japanese]

    NIIZEKI KYUICHI , UKAWA NARUMI , SAITOH TADASHI

    <p>睡眠は生命維持に不可欠な生理的欲求であり,睡眠不足とくに徐波睡眠の欠如は,肥満や高血圧,糖尿病,記憶障害など様々な疾患の素因になると考えられている。したがって睡眠時にどの程度徐波睡眠が現れるかを定量的に評価することは重要である。睡眠段階の推定には睡眠ポリグラフ検査が用いられるが,脳波,眼電図,筋電図の計測が必要であり,また睡眠段階の判別は時間を要するため,簡便な計測法の開発が望ま …

    Transactions of Japanese Society for Medical and Biological Engineering Annual56(Abstract), S274-S274, 2018

    J-STAGE 

  • Noncontact Simultaneous Measurements of Electrocardiogram and Pulse Beat toward Blood Pressure Monitoring in Bed  [in Japanese]

    TAKEUCHI Tomokazu , TANAKA Hiroyuki , FUJIOKA Eiji , UENO Akinori

    … <p>In this study, we developed a new approach for simultaneous noncontact measurements of electrocardiograms (ECGs) and pulse beats (PBs) using passive and semi-active capacitive-coupling methods. … Changes in the oscillatory frequency of the multi-vibrator caused by PBs were measured as voltage changes. …

    Transactions of Japanese Society for Medical and Biological Engineering 55(6), 267-271, 2017

    J-STAGE  Ichushi Web 

  • Association between phase coupling of respiratory sinus arrhythmia and brain activity during sleep  [in Japanese]

    Sutoh Ken , Ukawa Narumi , Saitoh Tadashi , Niizeki Kyuichi

    <p>呼吸性不整脈(RSA)と呼吸リズム間の位相コヒーレンス(&lambda)は心理ストレスで低下し,心拍変動の副交感神経活動指標と正の相関を,交感神経活動指標とは負の相関を示すことが明らかにされ,&lambdaは自律神経活動の指標となり得ることが示唆されている。心拍変動から推定される自律神経活動と睡眠時の脳波&delta波活動には強い相関が見られることが報告さ …

    Transactions of Japanese Society for Medical and Biological Engineering 55Annual(4AM-Abstract), 299-299, 2017

    J-STAGE 

  • Synchronization in Two Rings of Three Coupled van der Pol Oscillators

    Nariai Daiki , Tran Minh Hai , Uwate Yoko , Nishio Yoshifumi

    … We propose a novel coupled oscillatory system comprising two rings of van der Pol oscillators with different coupling schema. … We focus on the coupling strengths of the coupled van der Pol oscillators. … By computer simulation, we investigate how the synchronization phenomena change by changing the coupling strengths. …

    Journal of Signal Processing 21(4), 121-124, 2017

    J-STAGE 

  • Interval Estimation of Coupling Delay Time from Phase Time Series

    Boris Bezruchko , Elena Sidak , Dmitry Smirnov

    IEICE Proceeding Series (48), A4L-G-5, 2016

    DOI 

  • An Adaptability of the Oscillator Aggregation Based Robot Control to Synchronize Dynamical Behaviors of the External Object as an Emergence of Homeostasis  [in Japanese]

    Yamauchi Sho , Suzuki Keiji

    … Such energy flows are often oscillatory and there are regularity. … We proposed an oscillator aggregation based robot control mechanism to synchronize with oscillating objects in the external environment by using coupling van der Pol oscillators with a stochastic perturbation. …

    Transactions of the Japanese Society for Artificial Intelligence 31(3), B-F63_1-9, 2016

    J-STAGE 

  • Associative memory and amplitude death of hysteresis neural networks  [in Japanese]

    YAMAOKA Kei , SAITO Toshimichi

    本論文では,ヒステリシスニューラルネットの連想記憶機能における,振動停止現象の効果について考察する.相関学習に基づく簡素な方法を用いることにより,所望記憶を埋め込むことができる.振動停止現象は,単体のニューロンが振動状態であったものがニューロンの結合により安定平衡点となるような非線形現象である.基本的な数値実験を行い振幅停止現象が埋め込まれた記憶への吸引域を拡大できる場合があることを示す.

    IEICE technical report. Neurocomputing 114(437), 7-10, 2015-01-29

  • Detection of Cardiac Diseases from ECG Using Nonlinear Stochastic Filters

    Matoba Chisato , Imamasu Keisuke , Suemitsu Haruo , Matsuo Takami

    … Since the component elements exhibit oscillatory behavior, they can be modeled as nonlinear oscillators. … In this paper, we constitute the particle filter and the ensemble Kalman filter from this model to detect the cardiac diseases by estimating the coupling parameters. …

    Proceedings of the ISCIE International Symposium on Stochastic Systems Theory and its Applications 2015(0), 59-64, 2015

    J-STAGE 

  • 349 Nonlinear Normal Modes in Acoustically Coupled Tandem Microbubbles  [in Japanese]

    SUGITA Naohiro , SUGIURA Toshihiko

    … In this study, we focuses on the nonlinear dynamics of tandem microbubbles, and investigates their coupling oscillation using a perturbation method. … The coupling term is introduced into a set of coupled Rayleigh-Plesset equations in a form of an additional pressure term. …

    Dynamics and Design Conference : D & D 2014, "349-1"-"349-9", 2014-08-25

  • Oscillation Death in Polygonal Oscillatory Networks with Strong Coupling  [in Japanese]

    上手 洋子 , 西尾 芳文

    回路とシステムワークショップ論文集 Workshop on Circuits and Systems 27, 239-243, 2014-08-04

  • Frustrations in Strongly Coupled Polygonal Oscillatory Networks

    Yoko Uwate , Yoshifumi Nishio , Ruedi Stoop

    IEICE Proceeding Series (46), 377-380, 2014

    DOI 

  • Cardiolocomotor phase synchronization during rhythmic exercise

    Niizeki Kyuichi , Saitoh Tadashi

    … Biological rhythms can be entrained by internal oscillatory processes and often become synchronized with each other. … For integrated physiological systems, there is evidence to show that coupling can exist between cardiorespiratory and locomotor systems. …

    The Journal of Physical Fitness and Sports Medicine 3(1), 11-20, 2014

    J-STAGE  Ichushi Web 

  • Oscillatory Corticomuscular Coupling as a Determinant of Motor Precision and Quickness

    USHIYAMA Junichi

    … Despite progress in identifying the mechanisms underlying the generation of corticomuscular coherence, the functional roles played by this coupling in movement control are still unknown To address this issue, we conducted a large-scale experiment examining between-participant variance in EEG-EMG coherence in 100 healthy young individuals. …

    Advances in exercise and sports physiology 19(2), 25-31, 2013-07

    NDL Digital Collections  Ichushi Web 

  • Distribution of Shear Stress in Oscillatory Sheet-flow Layer by LES  [in Japanese]

    HARADA Eiji , GOTOH Hitoshi , TSURUTA Naoki

    … The components of shear stress in the oscillatory sheet-flow layer, especially concerning the inter-granular stress, are considerably unknown field because of difficulty in experimental measurements. … In the present study, components of the shear stress in the oscillatory sheet-flow layer have been addressed by the LES for the particulate flow based on the Euler-Lagrange coupling. …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 69(2), I_556-I_560, 2013

    J-STAGE 

  • X-ray and Electron Scattering Studies on Electronic Structures and Electronic Excitation Dynamics of Molecules  [in Japanese]

    Watanabe Noboru

    … has clearly shown the presence of oscillatory structure having information about the orientation in space of the constituent F 2p atomic orbitals. … Examining the momentum transfer dependence of the EELS cross section makes it possible to see coupling between electronic states. … By using this method we have revealed the roles of vibronic coupling in some valence-shell electronic excitations in CF<sub>4</sub> …

    Molecular Science 7(1), A0059, 2013

    J-STAGE 

  • Modeling of Social Networks by Large-Scale Coupled Oscillators  [in Japanese]

    Uwate Yoko

    … A coupling strength between the circuits is set to depend on the distance. …

    Bulletin of Institute of Technology and Science the University of Tokushima (58), 42-47, 2013

    IR 

  • Discussion about oscillatory phenomena and center nodes in complex networks with delay coupling  [in Japanese]

    Morishita Takeru , Moro Seiichiro

    本論分では結合に遅延を含む場合における複雑ネットワークの振動現象とセンターノードに関する考察を行う.センターノードはネットワーク振動の基点となるノードであり,また,振動の周期を決定する要因になるノードである.本研究において複雑ネットワークに遅延を発生させた際のネットワークの振動パターンの変化および,センターノードの状態の変化,センターノードがネットワーク振動に与える影響の考察を行った.

    IEICE technical report. Nonlinear problems 112(363), 35-38, 2012-12-17

  • The functional roles of time delay on flexible phase-locking in Bipedal locomotion

    Weng Wulin , Ei Shin-Ichiro , Ohgane Kunishige , Ogane Kunishige , 翁 武淋 , 栄 伸一郎 , 大金 邦成

    … Based on neurophysiological studies, a walking model has been proposed, which is the coupling of two oscillatory systems, i.e., a central pattern generator (CPG) and a musculoskeletal system (Body). … 2) a sign differs between coupling coefficients of the connection from Body to CPG and from CPG to Body, i.e., the afferent and efferent connection. …

    Journal of Math-for-Industry (JMI) 4(B), 123-133, 2012-10

    IR 

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