KINDAI UNIVERSITY


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YOSHIDA Hisashi

Profile

FacultyDepartment of Computational Systems Biology / Graduate School of Biology-Oriented Science and Technology
PositionProfessor
Degree
Commentator Guidehttps://www.kindai.ac.jp/meikan/404-yoshida-hisashi.html
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Last Updated :2020/06/01

Education and Career

Education

  •  - 1995 , Hosei University
  •  - 1995 , Hosei University, Graduate School, Division of Engineering
  •  - 1990 , Hosei University
  •  - 1990 , Hosei University, Faculty of Engineering

Research Activities

Research Areas

  • Informatics, Intelligent informatics
  • Life sciences, Biomaterials
  • Life sciences, Biomedical engineering
  • Informatics, Statistical science
  • Informatics, Biological, health, and medical informatics

Research Interests

  • Statistical Signal Analysis, Biosignal Analysis, Biosignal Processing, Time-Frequency Analysis

Published Papers

  • 感情画像刺激提示下の脳波アルファ帯域実効電圧のスケーリング係数の応答, 富永滋, 吉田久, 中迫昇, 岩城達也, 電子情報通信学会論文誌 D(Web), 電子情報通信学会論文誌 D(Web), J102-D(5), 399‐410 (WEB ONLY), May 01 2019
  • A Method of Connectivity Analysis of Epileptiform Discharges During Epileptic Seizure, Hisashi Yoshida, Yasuhito Yoshioka, Masaharu Miyauchi, Naoki Nakano, Amami Kato, International Journal of Bioelectromagnetism, International Journal of Bioelectromagnetism, 19(1), 6 - 10, Dec. 2017 , Refereed
  • Which is better Median Filter or Linear Filter as a Smoother?, KIKKAWA SHO, KOHAMA TAKESHI, YOSHIDA HISASHI, Mem Fac Biol Oriented Sci Technol Kinki Univ, Mem Fac Biol Oriented Sci Technol Kinki Univ, (36), 9 - 17, Sep. 30 2015
  • A mathematical model of retina considering the characteristics of the distribution of photoreceptor and ganglion cells, KUBO KENSUKE, KOHAMA TAKESHI, YOSHIDA HISASHI, 電子情報通信学会技術研究報告, 電子情報通信学会技術研究報告, 115(232(HIP2015 72-87)), 55 - 60, Sep. 21 2015
  • Analysis of pupil response and event-related potential during a fast-paced cognitive and attention task, Yoshida Hisashi, Kohama Takeshi, PERCEPTION, PERCEPTION, 44, 113, Aug. 2015 , Refereed
  • A simulation study of the effects of fixation eye movements on retinal responses, Kohama Takeshi, Nishino Makoto, Yoshida Hisashi, PERCEPTION, PERCEPTION, 44, 166, Aug. 2015 , Refereed
  • Quantitative assessments of arousal level by analyzing fixation eye movements and pupil fluctuations, HONDA SHOGO, KOHAMA TAKESHI, YOSHIDA HISASHI, 映像情報メディア学会技術報告, 映像情報メディア学会技術報告, 39(11(HI2015 45-55/3DIT2015 11-21)), 25 - 28, Mar. 03 2015
  • A mathematical model for reproducing stochastic properties of fixation eye movements, TOKUDOME Ken, KOHAMA Takeshi, KIKKAWA Sho, YOSHIDA Hisashi, ITE Technical Report, ITE Technical Report, 39(11), 21 - 24, Mar. 03 2015
    Summary:In this study, we propose a mathematical model of fixation eye movements controlled by visual attention mechanisms to establish an index for quantitative evaluation of higher-order cognitive functions. It is known that Mean Square Displacement (MSD) profiles of fixation eye movements show a crossover phenomenon (Engbert & Kliegl. 2004), which indicates that multiple external factors contribute to control of movements. We formulated a model based on a hypothesis that stable gazing is controlled by rectifying retinal errors by drifts and microsaccades. Simulation results suggest that fractional Brownian motion and continuous feedback to correct gaze positions yield the MSD profile of fixation eye movements. Furthermore, microsaccades contribute to modulate the MSD profile during short-range lags.
  • A verification of moduration of visual perception caused by fixation eye movements based on a model of retinae, NISHINO Makoto, KOHAMA Takeshi, YOSHIDA Hisashi, ITE Technical Report, ITE Technical Report, 39(11), 17 - 20, Mar. 03 2015
    Summary:In this study, we performed a simulation experiments using a mathematical model of a wide-scale retinal network considering the receptive fields' properties in parafovea. Vertical sinusoidal grating patterns and random dot patterns, which consist of particular spacial frequencies, were given as input patterns. We computed the retinal ganglion cells responses which were composed of either a high or a low spacial frequency. Simulation results of grating pattern input suggest that microsaccades enhance the membrane potential of ganglion cells for the low-frequency pattern, and as for the high-frequency patten, it is influenced by drifts and tremor, particularly on the responses of M-type cells under both conditions. On the other hand, they do not influence the activity of M- or P-type cells when any random dot pattern inputs was given. These results suggest that the strength of the effects derived by fixation eye movements on the retinal responses depend on the nature of the input patterns.
  • A saliency based motion detection model of visual system considering visual adaptation properties., Mitsuhiro Kodama, Takeshi Kohama, Hisashi Yoshida, 37th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC 2015, Milan, Italy, August 25-29, 2015, 37th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBC 2015, Milan, Italy, August 25-29, 2015, 6658 - 6661, 2015 , Refereed
  • 網膜神経系数理モデルを対象にした大規模シミュレーションの並列計算手法, NISHINO MAKOTO, KOHAMA TAKESHI, YOSHIDA HISASHI, Mem Fac Biol Oriented Sci Technol Kinki Univ, Mem Fac Biol Oriented Sci Technol Kinki Univ, (34), 35 - 46, Sep. 30 2014
  • Quantitative measurements of attentional concentration based on analyses of microsaccades and drift eye movements, KOHAMA TAKESHI, KIKKAWA SHO, YOSHIDA HISASHI, 電子情報通信学会技術研究報告, 電子情報通信学会技術研究報告, 114(226(HIP2014 43-59)), 87 - 92, Sep. 18 2014
  • Separation of artifacts mixed in the EEGs when eating with use of independent vector analysis (IVA), TOMINAGA SHIGERU, YOSHIDA HISASHI, NAKASAKO NOBORU, 電子情報通信学会技術研究報告, 電子情報通信学会技術研究報告, 114(51(MBE2014 1-11)), 37 - 42, May 17 2014
  • A quantitative evaluation of attentional concentration based on drift eye movement analyses, NOGUCHI Daisuke, KOHAMA Takeshi, KIKKAWA Sho, YOSHIDA Hisashi, ITE Technical Report, ITE Technical Report, 38(10), 45 - 48, Feb. 25 2014
    Summary:The purpose of this study is to evaluate the effect of visual attention on the dynamics of drift eye movements objectively. We proposed a signal processing method to separate drift eye movements and microsaccades from fixation eye movements in the experiments which control attentional concentration to the foveal region, and compared the properties of extracted drift eye movements between the conditions of attentional intensities. In our method, microsaccades are detected by using an order-statistic low-pass differentiation filter. The start- and end-point of each microsaccades is discriminated by a discrete pulse transform analysis, then microsaccades are removed from the data. These gaps are filling through the use of an autoregressive model to extract pure drift eye movements. After the extraction of drift eye movements, we analyzed the frequency components and mean-square displacements to examine the fluctuation properties of the drifts. As results, drift eye movements were not influenced by the foveal attention allocation, rather affected by diffusing attention to the peripheral visual field.
  • A study on superimposition mode of mastication EMG on EEG, and its trial separation with use of FDICA, TOMINAGA SHIGERU, YOSHIDA HISASHI, NAKASAKO NOBORU, 電子情報通信学会技術研究報告, 電子情報通信学会技術研究報告, 113(373(MBE2013 75-92)), 57 - 62, Dec. 14 2013
  • An objective assessment of stimulus-independent thoughts by analyzing near-infrared spectroscopy (NIRS) signals of lateral prefrontal cotex activity, KOHAMA TAKESHI, YOSHIDA HISASHI, YAMAWAKI NOBUYUKI, HAMANO YUKI, SHIMIZU TATSUO, Memoirs of the Faculty of Biology-Oriented Science and Technology of Kinki University, Memoirs of the Faculty of Biology-Oriented Science and Technology of Kinki University, (32), 7 - 16, Sep. 30 2013
  • A study on EEG lead systems, artifacts mixed into the EEGs when eating, and their classification methods based on ICA, TOMINAGA SHIGERU, YOSHIDA HISASHI, NAKASAKO NOBORU, 電子情報通信学会技術研究報告, 電子情報通信学会技術研究報告, 113(223(NC2013 22-45)), 113 - 118, Sep. 17 2013
  • Quantitative evaluation of arousal level based on the analyses of microsaccade rates and pupil fluctuations, Honda S, Kohama T, Tanaka T, Yoshida H, Proceedings of 35th Annual International Conference of the IEEE EMBC2013, Proceedings of 35th Annual International Conference of the IEEE EMBC2013, 2013, 2108 - 2111, Jul. 2013 , Refereed
  • A quantitative evaluation of visual factors of cybersickness by analyzing fixation eye movements and heart rate variability, Memoirs of the Faculty of Biology-Oriented Science and Technology of Kinki University, Memoirs of the Faculty of Biology-Oriented Science and Technology of Kinki University, 30, 1 - 16, Sep. 2012
  • EEG Analysis of Frontal Lobe Area in Arousal Maintenance State against Sleepiness, Hisashi Yoshida, Youki Tanaka, Sho Kikkawa, 2012 ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY (EMBC), 2012 ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY (EMBC), 2012, 2933 - 2936, 2012 , Refereed
    Summary:This paper describes EEG analysis of frontal lobe area in arousal maintenance state against sleepiness. Arousal maintenance state is considered different physiological state from the normal sleep onset. To analyze the EEG of frontal area might be important because we believe that the arousal maintenance state against sleepiness causes neuron activities from the frontal lobe, which coordinates behavior, to hypothalamus, which coordinates wakefulness and sleep. It is, however, hard to use EEG signals in the frontal area consistently because blinking artifacts are mixed in the EEG signals. In this paper, we have analyzed the EEG signals of the frontal lobe in arousal maintenance state against sleepiness after removing the eye-blinking artifact from the scalp EEG signals using an ICA denoising method. As a result, the EEG signals of the frontal area in the arousal maintenance state against sleepiness have wide band width as in the EEG of the occipital area. It strengthen sour speculation, i.e., the EEG desynchronization occurs because of the neuron activities from the frontal lobe to hypothalamus in order to maintain arousal state against sleepiness
  • A statistical analysis of attentional effects on drift eye movements, The ournal of the Institute of Image Information and Television Engineers, The ournal of the Institute of Image Information and Television Engineers, 64(12), 1892 - 1898, Dec. 2010
    Summary:Recent studies have demonstrated a close relationship between the frequency of microsaccades and covert attention shift. However, there are no argument of attentional effect on drift movements while attentive or inattentive fixation. In this study, we examine whether the visual attention have any influence on the drift eye movement based on the statistical analysis of time series of fixation eye movements. The results indicated that the power in around the 3-4 Hz frequency range enhanced when visual attention was dispersed over the perafoveal visual field. Furthermore, the amplitude of the drift eye movements were reinforced immediately after the microsaccades, especially after the square-wave jerks. These results suggest that microsaccades and drift eye movements are both controlled by higher order brain functions so as to acquire details of the visual information from the peripheral vision.
  • Analysis of Desynchronized Brain Activity in Wakefulness Maintenance State against Sleepiness by Instantaneous Equivalent Bandwidth, Proceedings of the 6th International Workshop on Biosignal Interpretation, Proceedings of the 6th International Workshop on Biosignal Interpretation, 388 - 391, Jun. 2009
  • Feasibility and accuracy of a newly developed hand-held device with a flat-type fluorescent lamp for measuring the minimal erythema dose for narrow-band UVB therapy, Morita Akimichi, Shintani Yoichi, Nishida Emi, Kato Hiroshi, Yoshida Hisashi, Minamoto Maki, Yamaguchi Yuji, Maeda Akira, PHOTODERMATOLOGY PHOTOIMMUNOLOGY & PHOTOMEDICINE, PHOTODERMATOLOGY PHOTOIMMUNOLOGY & PHOTOMEDICINE, 25(1), 41 - 44, Feb. 2009 , Refereed
  • A spectral estimation method by non-equinterval smoothing of log periodogram, Proceedings of SPIE, Proceedings of SPIE, 7074, Sep. 2008
  • EEG analysis based on Independent Component Anlaysis and positive time-frequency distribution, (19), 23 - 35, Apr. 2007
  • Information Theoretic Equivalent Bandwidths of Random Processes and Their Applications, Methods of Information in Medicine, Methods of Information in Medicine, 46(2), Mar. 2007
    Summary:Since most of the biomedical signals, such as electroencephalogram (EEG), electromyogram (EMG) and phonocardiogram (PCG), are nonstationary random processes, the time-frequency analysis has been extensively applied to those signals recently in order to achieve precise characterization and classification. In this paper, we have first defined a new class of information theoretic equivalent bandwidths (EBWs) of stationary random processes, then instantaneous EBWs (IEBWs) using nonnegative time-frequency distributions have been defined in order to track the change of the EBW of a nonstationary random process.
  • EEG analysis in wakefulness maintenance state against sleepiness by instantaneous equivalent bandwidths., Yoshida H, Kuramoto H, Sunada Y, Kikkawa S, Conference proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference, Conference proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference, 2007, 19 - 22, 2007 , Refereed
  • A Comparative Study of The Performance of Population Mixture Models for Image Thresholding, Memoirs of The School of B.O.S.T. of Kinki University, Memoirs of The School of B.O.S.T. of Kinki University, (17), 7 - 14, Mar. 2006
  • An Analysis of Respiratory Variation in the Heart Rate Using the Random Breathing Technique, Hisashi YOSHIDA, Kazuo YANA, Japanese Journal of Medical Electronics and Biological Engineering, Japanese Journal of Medical Electronics and Biological Engineering, 33(2), 101 - 108, 1995

Conference Activities & Talks

  • 難治性てんかん脳波のコネクティビティ解析区間の検討, YOSHIOKA YASUTO, YOSHIDA HISASHI, MIYAUCHI MASAHARU, NAKANO NAOKI, KATO AMAMI, 電子情報通信学会大会講演論文集(CD-ROM),   2015 02 24
  • 個人の音楽嗜好に着目した音楽に適合した画像の選定に関するフィルタ設計, HASEGAWA YU, TAKEDA SHOICHI, KOHAMA TAKESHI, YOSHIDA HISASHI, 日本感性工学会大会予稿集(CD-ROM),   2015
  • パーソナルユースを目的とした音楽に適した画像の選定に関する概念モデル, HASEGAWA YU, TAKEDA SHOICHI, KOHAMA TAKESHI, YOSHIDA HISASHI, 日本感性工学会春季大会予稿集(CD-ROM),   2015
  • 帯域制限された動的ランダムドット観察時の安静時脳活動のNIRS信号解析, NAMIKAWA HIROKI, KOHAMA TAKESHI, YOSHIDA HISASHI, 日本生体医工学会大会プログラム・論文集(CD-ROM),   2014
  • 視覚的注意の集中度合いとマイクロサッカード潜時分布の関係, KANO YUJI, KOHAMA TAKESHI, KIKKAWA SHO, YOSHIDA HISASHI, 日本生体医工学会大会プログラム・論文集(CD-ROM),   2014
  • 皮質電極を用いた難治性てんかん脳波のコネクティビティ解析, YOSHIOKA YASUTO, YOSHIDA HISASHI, MIYAUCHI MASAHARU, NAKANO NAOKI, KATO AMAMI, 日本生体医工学会大会プログラム・論文集(CD-ROM),   2014
  • The relationship between spatial extent of focal attention and latencies of microsaccades, Yuji Kanoh, Takeshi Kohama, Sho Kikkawa, Hisashi Yoshida, Transactions of Japanese Society for Medical and Biological Engineering,   2014 01 01
    Summary:© 2014, Japan Soc. of Med. Electronics and Biol. Engineering. All rights reserved. Recent studies have indicated that mechanisms of microsaccades, involuntary small shifts in gaze, are affected by attention. Most studies have shown that mocrosaccade rates increase with a shift of attention, while others have shown that occurrence of mocrosaccades is inhibited when attention is in foveal region. In this study, we calculated latencies of microsaccades and analyzed the relationship between the spatial extent of attention and latencies of microsaccades. Subjects performed rapid serial visual presentation tasks. Targets were defined by differences in luminance contrast from distractors. We controlled focal attention under two conditions: high-contrast (HC) and low-contrast (LC). Results show that the histogram of latencies of microsaccades have two peaks only in the LC. The second peak was delayed approximately 0.3 sec from the peak of the HC. These results suggest that microsaccades are inhibited when attention is concentrated in foveal region, and disinhibited when attention is disengaged.
  • Connectivity analysis of electrocorticograph of intractable epilepsy, Yasuto Yoshioka, Hisashi Yoshida, Masaharu Miyauchi, Naoki Nakano, Amami Kato, Transactions of Japanese Society for Medical and Biological Engineering,   2014 01 01
    Summary:© 2014, Japan Soc. of Med. Electronics and Biol. Engineering. All rights reserved. Epilepsy prevalence is up to about 1% of the population. 25% of these patients have intractable epilepsy. For these patients however, surgery is an effective treatment, therefore accurately determining the propagation path and epileptic foci is a crucial factor in surgical treatment. In this study, we propose a method to analyze connectivity among the brain signals during epileptiform seizure which were recorded from the electrodes directly placed on the cortex. First, we obtained the delay time and maximum value of the correlation function and defined connectivity strength between channels by a linear combination of the two. Then, using the connectivity strength, we configured a minimum spanning tree, which was estimated to be the epilepsy propagation path. As a result, the foci of epilepsy moved slightly for a total of four times for each seizure in the same patient; different propagation paths of the seizure at different times was shown.
  • An analysis of resting-state NIRS responses evoked by low-passed dynamic randam-dot patterns, Hiroki Namikawa, Takeshi Kohama, Hisashi Yoshida, Transactions of Japanese Society for Medical and Biological Engineering,   2014 01 01
    Summary:© 2014, Japan Soc. of Med. Electronics and Biol. Engineering. All rights reserved. Recent brain science studies have focused on functional connectivity in functional networks. However, experimental conditions are not sufficiently controlled to reduce individual differences in order to make experimental data stable because the definition of resting states is ambiguous. The purpose of this study is to investigate a more stable method of measuring restiong state brain activity. Subjects performed a 2-back task to facilitate activity of the prefrontal cortex temporally. As half-closed eyes help induce a meditative state, we presented low-passed dynamic random-dot patterns (DRD) in the background to make subjects' vision similar to what they would see if their eyes were half-closed. We measured subjects' brain activity with a NIRS device while subjects observed DRDs for 180 seconds. As a result, prefrontal activity decreased earlier as DRDs increased in blurriness. Moreover, brain activity reactivated immediately after reaching the baseline. This suggests that our method may induce stable resting states effectively.
  • A study on superimposition mode of mastication EMG on EEG, and its trial separation on FDICA,   2013 12
  • A study on EEG lead systems, artifacts mixed into the EEGs when eating, and their classification methods based on ICA,   2013 09
  • Evaluation of visual factors of visually induced motion sickness by analyzing fixation eye movements and heart rate variability, 35th European Conference on Visual Perception,   2013 08 , 35th European Conference on Visual Perception
  • Persistent inhibition of microsaccades caused by attentional concentration, 35th European Conference on Visual Perception,   2013 08 , 35th European Conference on Visual Perception
  • A mathematical model for reproducing mean square displacement profile of fixation eye movements, Neuro 2013,   2013 06 , Neuro 2013
  • Movility evaluation of water molecules around c-Myb protein under high pressure using MD simulation, SOGABE TAKUYA, YOSHIDA HISASHI, AKASAKA KAZUYUKI, 電子情報通信学会大会講演論文集,   2013 03 05
  • Detection of quasi-periodic pulse using nonlinear transform and dynamic thresholding, YAMAMOTO HIROKI, YOSHIDA HISASHI, 電子情報通信学会大会講演論文集,   2013 03 05
  • A slow eye movement (SEM) detection method for objective evaluations of arousal fluctuations,   2012 12
  • 覚醒水準変動の客観的評価のためのSEM検出手法, HONDA SHOGO, KOHAMA TAKESHI, YOSHIDA HISASHI, 映像情報メディア学会冬季大会講演予稿集(CD-ROM),   2012 11 27
  • Noninvasive measurement of fetal ECG and heart rate for prenatal care,   2012 07
  • Maternal Healthcare System: a method for fetal ECG detection,   2012 07
  • 妊婦見守りのための無侵襲胎児心電・心拍計測, YOSHIDA HISASHI, SADO TOSHIYUKI, KOBAYASHI HIROSHI, 日本小児循環器学会雑誌,   2012 06 01
  • Copula based Positive Time-Frequency Distribution in Stochastic Processes and Its Application to Biosignals, World Congress 2012,   2012 05 , World Congress 2012
    Summary:It is very important to know the time-frequency characteristics of biosignals because they are usually considered non-stationary random signals. However, most of theories of the time-frequency analysis are for the deterministic time varying signals. A positive time-frequency distribution (TFD) is a joint density of time and frequency, which satisfies the marginals and would represent energy distribution (i.e. positive) between the time and frequency variables. In this paper, we show that it is important to accurately estimate the marginals of the time-frequency distribution (TFD) of a random signal, especially when you estimate the TFD based on Copula Theory. firstly, we propose some new methods to estimate temporal marginal and frequency marginal and compare the methods. Then, we give some simulation to evaluate these methods. Finally, we apply the method to real applications, i.e. EEG analysis in wakefulness maintenance state against sleepiness.
  • R wave Detection using nonlinear transform and dynamic thresholding,   2012 05
    Summary:Hart rate variability(HRV) is considered as an index of autonomic nervous activity. In order to measure the HRV, it is necessary to detect R waves from ECG and to measure the intervals between consecutive R waves. In the case that ECG artifacts are small, the static thresholding method is very useful for detecting the R waves on a real-time. However, like the fetal ECG(FECG) which is extracted from the maternal abdomen includes electrical interference by outside sources, the static thresholding method often fails to detect the R waves. In this study, we have proposed a method for R wave detection using nonlinear transform and dynamic thresholding.
  • Microsaccade detection based on a discrete pulse transform analysis,   2012 05
    Summary:This study proposes a method for detecting microsaccades based on a discrete ulse transform analysis (DPT). The general methods for microsaccade detection need to decide the threshold for a differentiation signal of eye movements after enoising by the median filter. The median filter well maintain sharp edges configured by microsaccades, however, theoretical prediction of the behavior is difficult.Because of this unpredictability, the trial and error process is necessitated to decide the threshold value or the order of the filters. The proposed method is to detect microsaccades based on the features of the pulse series produced by DPT. The eye movement signal is divided into smoothed and detail components by multiple orders of LULU filters, then the pulse series which represents the dynamics of movements is calculated. The results show the detected microsaccades is more precise than general method. Furthermore,the start- and end-point of each microsaccades is clearly discriminated.
  • Microsaccade detection with a order-statistic low-pass differentiation filter.,   2011 12
  • Spectral Analysis of Autonomic Nervous Systems in Wakefulness Maintenance State against Sleepiness,   2011 05
  • Evaluation of arousal level by microsaccade rate and pupil fluctuation,   2011 04
  • Objective evaluation of wakefulness maintenance state against sleepiness and its analysis,   2010 09
  • Effects of motion sickness on fixation eye movements,   2010 06
  • Microsaccade rate varies with arousal level,   2010 06
  • Molecular Dynamics Simulations of R2 Domain in the c-Myb Protein under High-Pressure Conditions,   2010 05
  • A Statistical Model Analysis of Attentional Effects on Fixational Drift Eye Movements, International Workshop on Image Media Quality and Its Applications (IMQA2010),   2010 05 , International Workshop on Image Media Quality and Its Applications (IMQA2010)
  • Fetal ECG measurement and extraction from maternal ECG,   2009 11
  • A spectral estimation method by non-equinterval smoothing,   2009 11
  • Positive time-frequency distribution based on copula theory and its application,   2009 10
  • Preliminary analysis of EEG and autonomic nervous systems in wakefulness maintenance state against sleepiness,   2009 09
  • Attentional effects on drift eye movements before and after microsaccades, 32nd European Conference on Visual Perception,   2009 08 , 32nd European Conference on Visual Perception
  • A study of simultaneous recordings of EEG and blood pressure during wakefulness maintenance state against sleepiness,   2009 04
  • A spectral estimation method by non-equinterval smoothing of log periodogram,   2008 11
  • Equivalent bandwidths by information theoretic divergence and its application to biosignals,   2008 10
  • EEG analysis in wakefulness maintenance state against sleepiness: relationship between gamma frequencies and muscle activity.,   2008 09
  • Attentional effects on power spectra for drift eye movements, The European Conference on Visual Perception 2008,   2008 08 , The European Conference on Visual Perception 2008
  • A comparison study of EEG analysis in wakefulness maintenance state against sleepiness and spontaneous sleep induction state,   2008 05
  • EEG Analysis in Wakefulness Maintenance State against Sleepiness by Instantaneous Equivalent Bandwidths, 29th IEEE EMBS Annual International Conference,   2007 11 , 29th IEEE EMBS Annual International Conference
    Summary:This paper proposes a new method for analyzing brain activity from Electroencephalogram (EEG) based on a concept of instantaneous equivalent bandwidths (IEBWs). The essence of the method using the IEBW is to track bandwidths changes of EEG signals. Copula-based time-frequency distributions have been adopted and we have also modified the construction method suitable for non-stationary random signals. The method was applied to EEG analysis in the wakefulness maintenance state against sleepiness. In our present study, sporadic synchronization was shown in the EEG signals while the subjects were trying to maintain wakefulness against sleepiness. That is, synchronization and desynchronization seem to succeed each other in the period. The results imply that the proposed method can track the EBWs change of EEG signals.
  • Independent Conponent Analysis by Renyi's Mutual Information,   2007 03
  • EEG Analysis in the Wakefulness Maintenance State,   2007 03
  • Marginal Estimation in Copula-based Time-Frequency Analysis of a Random Signal, Fifth International Workshop on Information Optics (WIO-06),   2006 06 , Fifth International Workshop on Information Optics (WIO-06)
  • Heart Rate Spectrum Characterization by Entropy Bandwidth,   2006 05
  • Entropy Estimation by spacings and Image classfication,   2003 11
  • Optimum thvesholding by maximum mutual information cviferion,   2003 11
  • A Practical algorithm for detecting O-ring burrs,   2003 03
  • Application of Information Theoretic Divergence in Analysis of Fluctuations,   2002 11
  • A fast algorithm for adaptive partitionning distributions and its application to multithresholding,   2002 11
  • An estimation method of a periodogram by non equ interval smoothing,   2002 11
  • Generalized equivalent baudwidth defined by using Renyi’s entropy and its estimation,   2002 07
  • Generalized equaialent bandwidth defined by using Renyi’s entropy and its application to EEG analysis,   2002 06
  • A New class of equioalent bandwidth and its application to bio-signals, The 2001 International Technical Conference on Corcuits/Systems, Computers and Communications,   2001 07 , The 2001 International Technical Conference on Corcuits/Systems, Computers and Communications
  • Equivalent Bandwidth of order α and its application to EEG analysis,   2001 03
  • Equivalent bandwidth of a random process and Renyi's entropy,   2001 03

Misc

  • A microsaccade detection method using state‐space model, 吉田久, 小濱剛, システム制御情報学会研究発表講演会講演論文集(CD-ROM), 63rd, ROMBUNNO.GSc03‐7,   2019 05 15 , https://jglobal.jst.go.jp/detail?JGLOBAL_ID=201902266389058130
  • 深層学習を用いた虚弱高齢者の判定, 高木智弘, 小濱剛, 楠正暢, 岡田荘市, 藤田英二, 竹島伸生, 吉田久, 電子情報通信学会大会講演論文集(CD-ROM), 2019, ROMBUNNO.D‐12‐53,   2019 03 05 , https://jglobal.jst.go.jp/detail?JGLOBAL_ID=201902242707905467
  • Positive Time-Frequency Distribution based on Copula Theory and Instantaneous Equivalent Bandwidth, YOSHIDA Hisashi, 415, 105, 112,   2019 03
  • Application of Time-Frequency Analysis in Biomedical Signals and the Challeges, YOSHIDA Hisashi, ISHIDA Kazuhiro, KIKKAWA Sho, 数理解析研究所講究録, 2102, 32, 41,   2019 02
  • 携帯式尿流量計(p‐flowdiary)による日本人男性の尿流率の検討と尿流ノモグラムの作成, 篠原雅岳, 吉田久, 松下千枝, 鳥本一匡, 坂宗久, 平尾佳彦, 藤本清秀, 日本生体医工学会大会プログラム・抄録集(Web), 58th, ROMBUNNO.OS‐048 (WEB ONLY),   2019 , https://jglobal.jst.go.jp/detail?JGLOBAL_ID=201902250093901624
  • 母胎腹壁上で観測される微少な胎児心電位抽出とその分布推定, 吉田久, 鈴木佑実, 成瀬勝彦, 佐道俊幸, 小林浩, 日本生体医工学会大会プログラム・抄録集(Web), 58th, ROMBUNNO.OS‐079 (WEB ONLY),   2019 , https://jglobal.jst.go.jp/detail?JGLOBAL_ID=201902294970577108
  • 再帰型ニューラルネットワークによるマイクロサッカード検出手法, 宮竹海地, 小濱剛, 吉田久, 日本生体医工学会大会プログラム・抄録集(Web), 57th, ROMBUNNO.O2‐7‐3‐2 (WEB ONLY),   2018 06 19 , http://jglobal.jst.go.jp/public/201902267619380237
  • てんかん発作初期・中期・収束期における皮質脳波コネクティビティ解析, 田中綜一郎, 吉田久, 宮内正晴, 中野直樹, 加藤天美, 日本生体医工学会大会プログラム・抄録集(Web), 57th, ROMBUNNO.OS3‐3‐3‐4 (WEB ONLY),   2018 06 19 , http://jglobal.jst.go.jp/public/201902274832519613
  • Deep Neural Networkを用いた虚弱高齢者の判定, 高木智弘, 小濱剛, 楠正暢, 岡田荘市, 藤田英二, 竹島伸生, 吉田久, 電子情報通信学会大会講演論文集(CD-ROM), 2018, ROMBUNNO.D‐12‐5,   2018 03 06 , http://jglobal.jst.go.jp/public/201802256220139696
  • A Connectivity Analysis of ECoG of a patient with Intractable Temporal Lobe Epilepsy, YOSHIDA Hisashi, 408, 18, 26,   2018 03
  • An effect of ocular microtremor on vernier acuity based on retinal neuron circuit model considering sampling properties of photoreceptors, 久保賢典, 小濱剛, 吉田久, 映像情報メディア学会技術報告, 42, 7(HI2018 44-49/3DIT2018 1-6), 9‐12,   2018 02 28 , http://jglobal.jst.go.jp/public/201802247661261854
  • 母体腹壁上の胎児心電位分布推定とe‐Textile開発の試み, 吉田久, 小仲沙季, 足立敏, 平野喜久夫, 杉村和重, 上島一夫, 黒田知宏, 吉田正樹, 佐道俊幸, 小林浩, 日本生体医工学会大会プログラム・抄録集(Web), 56th, 207 (WEB ONLY),   2017 05 03 , http://jglobal.jst.go.jp/public/201902210938357111
  • 事象関連fNIRS計測に基づく認知機能の定量的評価, 小林葵, 岡本亮太, 小濱剛, 吉田久, 日本生体医工学会大会プログラム・抄録集(Web), 56th, 220 (WEB ONLY),   2017 05 03 , http://jglobal.jst.go.jp/public/201902227800778918
  • てんかん発作初期段階における偏相関関数を用いたコネクティビティ解析, 田中綜一郎, 吉田久, 宮内正春, 中野直樹, 加藤天美, 日本生体医工学会大会プログラム・抄録集(Web), 56th, 280 (WEB ONLY),   2017 05 03 , http://jglobal.jst.go.jp/public/201902266438204182
  • 血流動態に基づくfNIRS観測信号の機能成分と全身成分への分離パラメータ特性, 和宇慶真, 小濱剛, 吉田久, 日本生体医工学会大会プログラム・抄録集(Web), 56th, 219 (WEB ONLY),   2017 05 03 , http://jglobal.jst.go.jp/public/201902276575648611
  • マイクロサッカードの動的特性を再現する固視微動の数理モデル, 奧慎介, 大谷尚平, 小濱剛, 吉田久, 日本生体医工学会大会プログラム・抄録集(Web), 56th, 360 (WEB ONLY),   2017 05 03 , http://jglobal.jst.go.jp/public/201902279318578484
  • てんかん患者および健常者の前部帯状回を中心としたネットワーク解析, 杉野寿樹, 吉田久, 宮内正晴, 中野直樹, 加藤天美, 日本生体医工学会大会プログラム・抄録集(Web), 56th, 282 (WEB ONLY),   2017 05 03 , http://jglobal.jst.go.jp/public/201902282803189589
  • 母体腹壁上の胎児心電位分布推定法, 小仲沙季, 吉田久, 成瀬勝彦, 佐道俊幸, 小林浩, 電子情報通信学会大会講演論文集(CD-ROM), 2017, ROMBUNNO.D‐7‐18,   2017 03 07 , http://jglobal.jst.go.jp/public/201702247694665742
  • てんかん患者の前部帯状回を中心としたネットワーク解析, 杉野寿樹, 吉田久, 宮内正晴, 中野直樹, 加藤天美, 電子情報通信学会大会講演論文集(CD-ROM), 2017, ROMBUNNO.D‐7‐6,   2017 03 07 , http://jglobal.jst.go.jp/public/201702268593631312
  • Hemodynamic response measurment of visual cortex based on general linear model analysis for event-related fNIRS signals, 岡本亮太, 小林葵, 小濱剛, 吉田久, 映像情報メディア学会技術報告, 41, 9(HI2017 53-61/3DIT2017 9-17), 25‐28,   2017 03 01 , http://jglobal.jst.go.jp/public/201702240787912813
  • An analysis of steering accuracy and eye movement properties under language fluent tasks, 中井裕真, 小濱剛, 上田慎一, 松田康太, 角野彩, 吉田久, 映像情報メディア学会技術報告, 41, 9(HI2017 53-61/3DIT2017 9-17), 9‐12,   2017 03 01 , http://jglobal.jst.go.jp/public/201702251747406504
  • 携帯式尿流量計(P‐FlowdiaryR)を用いた排尿量と尿流量に関する検討, 篠原雅岳, 篠原雅岳, 松下千枝, 松下千枝, 鳥本一匡, 坂宗久, 吉田久, 平尾佳彦, 藤本清秀, 日本泌尿器科学会総会(Web), 105th, ROMBUNNO.OP32‐6 (WEB ONLY),   2017 , http://jglobal.jst.go.jp/public/201702287165406480
  • 網膜‐外側膝状体間における視覚情報のリマッピング, 久保賢典, 小濱剛, 吉田久, Memoirs of the Faculty of Biology-Oriented Science and Technology of Kinki University, 38, 11‐20,   2016 10 31 , http://jglobal.jst.go.jp/public/201602228662173383
  • Influence of target patterns on dynamic characteristics of fixation eye movements, 大谷尚平, 小濱剛, 吉川昭, 吉田久, 電子情報通信学会技術研究報告, 116, 229(HIP2016 42-60), 61‐66,   2016 09 20 , http://jglobal.jst.go.jp/public/201602214440288774
  • An analysis of spatial sampling properties of peripheral vision based on a retinal neuron network model, 久保賢典, 小濱剛, 吉田久, 電子情報通信学会技術研究報告, 116, 229(HIP2016 42-60), 79‐84,   2016 09 20 , http://jglobal.jst.go.jp/public/201602290051623261
  • 独立成分分析を用いたfNIRS計測信号解析手法の検討, 岡本亮太, 小濱剛, 吉田久, センシングフォーラム資料(CD-ROM), 33rd, ROMBUNNO.1A3‐2,   2016 09 01 , http://jglobal.jst.go.jp/public/201602232599064446
  • 母体腹壁生体電位計測による胎児心電位・心拍数測定, 吉田久, 成瀬勝彦, 佐道俊幸, 小林浩, センシングフォーラム資料(CD-ROM), 33rd, ROMBUNNO.1A3‐4,   2016 09 01 , http://jglobal.jst.go.jp/public/201602264210444619
  • マイクロサッカードの動的特性と注視視標形状との関係, 大谷尚平, 小濱剛, 吉川昭, 吉田久, センシングフォーラム資料(CD-ROM), 33rd, ROMBUNNO.1A3‐3,   2016 09 01 , http://jglobal.jst.go.jp/public/201602271850307834
  • c‐MybR2のキャビティが主鎖二面角にもたらす影響と高圧下での変化について, 曽我部拓哉, 吉田久, 赤坂一之, 日本蛋白質科学会年会プログラム・要旨集, 16th, 140,   2016 05 19 , http://jglobal.jst.go.jp/public/201602287747824231
  • A Connectivity Analysis in Intractable Temporal Lobe Epilepsy, 吉岡康人, 吉田久, 宮内正晴, 中野直樹, 加藤天美, 電子情報通信学会技術研究報告, 115, 513(MBE2015 102-131), 67‐72,   2016 03 15 , http://jglobal.jst.go.jp/public/201602269813097732
  • 側頭葉てんかん患者の帯域別皮質脳波解析, 神保亮輔, 吉岡康人, 吉田久, 吉田久, 宮内正春, 中野直樹, 加藤天美, 電子情報通信学会大会講演論文集(CD-ROM), 2016, ROMBUNNO.D‐7‐4,   2016 03 01 , http://jglobal.jst.go.jp/public/201602200840800373
  • An analyses of characteristics of fixational eye movements in amblyopia, KANOH Yuji, NAKAI Yuma, OHTANI Shohei, TANAKA Hiroko, SHIRAI Kumi, KOHAMA Takeshi, SAIKA Shizuya, YOSHIDA Hisashi, ITE Technical Report, 40, 9, 9, 12,   2016 03 01 , http://ci.nii.ac.jp/naid/110010044742
    Summary:It is known that amblyopia could be improved by sight training such as visual attention concentration tasks. However, the effectiveness of sight training could not evaluate objectively because amblyopia is not fully understood so far. Since visual attention influences on fixation eye movements, which are involuntary miniature movements of the eye, there is a possibility that the properties of fixation eye movements would change by sight training. In order to investigate the characteristics of fixation eye movements of amblyopic eye, we carried out an experiment which maintain visual fixation during focal attention tasks. The results of analyses of fixation eye movements suggest that microsaccade rate and microsaccade amplitude are both higher than those of normal eyes. Moreover, frequency analysis of drift eye movements indicate that the amplitude of fluctuation in low frequency component of amblyopic eyes is larger than that of normal eyes.
  • Inhibition effects on resting fNIRS signals of prefrontal cortex by dynamic random-dot patterns, NAMIKAWA Hiroki, OKAMOTO Ryota, SHIBATA Haruna, KOHAMA Takeshi, YOSHIDA Hisashi, ITE Technical Report, 40, 9, 13, 16,   2016 03 01 , http://ci.nii.ac.jp/naid/110010044743
    Summary:In the measurement of the functional near-infrared spectroscopy (fNIRS), the difference between resting state and task-performing state is often evaluated as an index of brain activities. However, since the definition of resting-state is ambiguous, the experimental conditions of resting state are not controlled, and this makes individual differences of experimental data enlarged. In this study, we investigate the condition to be recovered to resting state earlier during a recovery process after brain activation. We compared the brain activity of prefrontal cortex (PFC) while gazing at a low-passed dynamic random-dot pattern (DRD) or a fixation crosshair after performing a 3-back task. The results suggest that the averaged activities of PFC in the DRD condition were significantly lower than the FT condition.
  • 個人利用を目的とした音楽の印象に適した画像の選定:設計システムの改良, 長谷川優, 武田昌一, 小濱剛, 吉田久, 日本感性工学会大会予稿集(CD-ROM), 18th, ROMBUNNO.A33,   2016 , http://jglobal.jst.go.jp/public/201602249830923212
  • 個人利用を目的とした音楽の印象に適した画像の選定:システム設計とテスト運用, 長谷川優, 武田昌一, 小濱剛, 吉田久, 日本感性工学会春季大会予稿集(CD-ROM), 11th, ROMBUNNO.G6‐7,   2016 , http://jglobal.jst.go.jp/public/201602278765204032
  • The effects of cognitive loads derived from voice or manual responses on microsaccade rate, 中井裕真, 大谷尚平, 加納悠史, 山本雅也, 上田慎一, 栗原正幸, 小濱剛, 吉田久, 電子情報通信学会技術研究報告, 115, 232(HIP2015 72-87), 79, 84,   2015 09 21 , http://jglobal.jst.go.jp/public/201502209473210726
  • 難治性てんかん脳波のコネクティビティ解析区間の検討, 吉岡康人, 吉田久, 宮内正春, 中野直樹, 加藤天美, 電子情報通信学会大会講演論文集(CD-ROM), 2015, ROMBUNNO.D-7-8,   2015 02 24 , http://jglobal.jst.go.jp/public/201502247074953748
  • 個人の音楽嗜好に着目した音楽に適合した画像の選定に関するフィルタ設計, 長谷川優, 武田昌一, 小濱剛, 吉田久, 日本感性工学会大会予稿集(CD-ROM), 17th, ROMBUNNO.F32,   2015 , http://jglobal.jst.go.jp/public/201502215910475629
  • パーソナルユースを目的とした音楽に適した画像の選定に関する概念モデル, 長谷川優, 武田昌一, 小濱剛, 吉田久, 日本感性工学会春季大会予稿集(CD-ROM), 10th, ROMBUNNO.2C-02,   2015 , http://jglobal.jst.go.jp/public/201502244572771062
  • マイクロサッカード潜時解析に基づく音声および身体応答による認知負荷の客観的評価, 中井裕真, 加納悠史, 上田慎一, 栗原正幸, 岩崎健二, 小濱剛, 吉田久, 日本生体医工学会大会プログラム・論文集(CD-ROM), 54th, 391‐392,   2015 , http://jglobal.jst.go.jp/public/201602241335654010
  • 側頭葉てんかん発作時における異常興奮脳波の伝播形態, 吉岡康人, 吉田久, 宮内正春, 中野直樹, 加藤天美, 日本生体医工学会大会プログラム・論文集(CD-ROM), 54th, 443‐445,   2015 , http://jglobal.jst.go.jp/public/201602254955080275
  • NIRSによる安静時機能的結合推定のための計測条件の検討, 岡本亮太, 並河弘樹, 小濱剛, 吉田久, 日本生体医工学会大会プログラム・論文集(CD-ROM), 54th, 377‐378,   2015 , http://jglobal.jst.go.jp/public/201602276490854448
  • The relationship between spatial extent of focal attention and latencies of microsaccades, Yuji Kanoh, Takeshi Kohama, Sho Kikkawa, Hisashi Yoshida, Transactions of Japanese Society for Medical and Biological Engineering, 52,   2014 01 01 , 10.11239/jsmbe.52.O-53, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84939421280&origin=inward
    Summary:© 2014, Japan Soc. of Med. Electronics and Biol. Engineering. All rights reserved. Recent studies have indicated that mechanisms of microsaccades, involuntary small shifts in gaze, are affected by attention. Most studies have shown that mocrosaccade rates increase with a shift of attention, while others have shown that occurrence of mocrosaccades is inhibited when attention is in foveal region. In this study, we calculated latencies of microsaccades and analyzed the relationship between the spatial extent of attention and latencies of microsaccades. Subjects performed rapid serial visual presentation tasks. Targets were defined by differences in luminance contrast from distractors. We controlled focal attention under two conditions: high-contrast (HC) and low-contrast (LC). Results show that the histogram of latencies of microsaccades have two peaks only in the LC. The second peak was delayed approximately 0.3 sec from the peak of the HC. These results suggest that microsaccades are inhibited when attention is concentrated in foveal region, and disinhibited when attention is disengaged.
  • An analysis of resting-state NIRS responses evoked by low-passed dynamic randam-dot patterns, Hiroki Namikawa, Takeshi Kohama, Hisashi Yoshida, Transactions of Japanese Society for Medical and Biological Engineering, 52,   2014 01 01 , 10.11239/jsmbe.52.O-383, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84939424058&origin=inward
    Summary:© 2014, Japan Soc. of Med. Electronics and Biol. Engineering. All rights reserved. Recent brain science studies have focused on functional connectivity in functional networks. However, experimental conditions are not sufficiently controlled to reduce individual differences in order to make experimental data stable because the definition of resting states is ambiguous. The purpose of this study is to investigate a more stable method of measuring restiong state brain activity. Subjects performed a 2-back task to facilitate activity of the prefrontal cortex temporally. As half-closed eyes help induce a meditative state, we presented low-passed dynamic random-dot patterns (DRD) in the background to make subjects' vision similar to what they would see if their eyes were half-closed. We measured subjects' brain activity with a NIRS device while subjects observed DRDs for 180 seconds. As a result, prefrontal activity decreased earlier as DRDs increased in blurriness. Moreover, brain activity reactivated immediately after reaching the baseline. This suggests that our method may induce stable resting states effectively.
  • Connectivity analysis of electrocorticograph of intractable epilepsy, Yasuto Yoshioka, Hisashi Yoshida, Masaharu Miyauchi, Naoki Nakano, Amami Kato, Transactions of Japanese Society for Medical and Biological Engineering, 52,   2014 01 01 , 10.11239/jsmbe.52.O-367, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84939423996&origin=inward
    Summary:© 2014, Japan Soc. of Med. Electronics and Biol. Engineering. All rights reserved. Epilepsy prevalence is up to about 1% of the population. 25% of these patients have intractable epilepsy. For these patients however, surgery is an effective treatment, therefore accurately determining the propagation path and epileptic foci is a crucial factor in surgical treatment. In this study, we propose a method to analyze connectivity among the brain signals during epileptiform seizure which were recorded from the electrodes directly placed on the cortex. First, we obtained the delay time and maximum value of the correlation function and defined connectivity strength between channels by a linear combination of the two. Then, using the connectivity strength, we configured a minimum spanning tree, which was estimated to be the epilepsy propagation path. As a result, the foci of epilepsy moved slightly for a total of four times for each seizure in the same patient; different propagation paths of the seizure at different times was shown.
  • 帯域制限された動的ランダムドット観察時の安静時脳活動のNIRS信号解析, 並河弘樹, 小濱剛, 吉田久, 日本生体医工学会大会プログラム・論文集(CD-ROM), 53rd, ROMBUNNO.O3-10-7,   2014 , http://jglobal.jst.go.jp/public/201402227712266372
  • 視覚的注意の集中度合いとマイクロサッカード潜時分布の関係, 加納悠史, 小濱剛, 吉川昭, 吉田久, 日本生体医工学会大会プログラム・論文集(CD-ROM), 53rd, ROMBUNNO.O1-05-5,   2014 , http://jglobal.jst.go.jp/public/201402247449902537
  • 皮質電極を用いた難治性てんかん脳波のコネクティビティ解析, 吉岡康人, 吉田久, 宮内正春, 中野直樹, 加藤天美, 日本生体医工学会大会プログラム・論文集(CD-ROM), 53rd, ROMBUNNO.O3-09-5,   2014 , http://jglobal.jst.go.jp/public/201402282833725308
  • 分子動力学法を用いた高圧下におけるc‐Mybタンパク質とキャビティ内水分子の変動解析, 曽我部拓哉, 吉田久, 赤坂一之, 日本蛋白質科学会年会プログラム・要旨集, 13th, 96,   2013 05 31 , http://jglobal.jst.go.jp/public/201302255065488020
  • 分子動力学法を用いた高圧下におけるc‐Myb蛋白と水の変動解析, 曽我部拓哉, 吉田久, 赤坂一之, 電子情報通信学会大会講演論文集, 2013, 66,   2013 03 05 , http://jglobal.jst.go.jp/public/201302251224845046
  • 非線形変換と動的閾値を用いた準周期的パルスの検出, 山本洋己, 吉田久, 電子情報通信学会大会講演論文集, 2013, 99,   2013 03 05 , http://jglobal.jst.go.jp/public/201302267330295687
  • 覚醒水準変動の客観的評価のためのSEM検出手法, 本田彰吾, 小濱剛, 吉田久, 映像情報メディア学会冬季大会講演予稿集(CD-ROM), 2012, ROMBUNNO.9-8,   2012 11 27 , http://jglobal.jst.go.jp/public/201202256847714303
  • 固視微動と心拍変動の解析に基づく映像酔いをもたらす映像要素の定量的分析, 小濱剛, 吉田久, 北林勇弥, 兵藤宏紀, Mem Fac Biol Oriented Sci Technol Kinki Univ, 30, 1, 15,   2012 09 30 , http://jglobal.jst.go.jp/public/201202246034986475
  • 妊婦見守りのための無侵襲胎児心電・心拍計測, 吉田久, 佐道俊幸, 小林浩, 日本小児循環器学会雑誌, 28, Supplement, S101,   2012 06 01 , http://jglobal.jst.go.jp/public/201202206027665505
  • 妊婦守りシステム―胎児心電位信号の検出―, YOSHIDA HISASHI, YAMAMOTO HIROKI, NISHIYAMA SHOHEI, SADO TOSHIYUKI, KOBAYASHI HIROSHI, システム制御情報学会研究発表講演会講演論文集(CD-ROM), 56th, ROMBUNNO.M14-5,   2012 05 21 , http://jglobal.jst.go.jp/detail.php?from=API&JGLOBAL_ID=201202283023413875
  • Arousal evaluation based on the analysis of microsaccade rate and pupil fluctuation, ITE Technical Report HI, 36, 13, 51, 54,   2012 03
  • Quantitative assessment of visually induced motion sickness based on the analysis of fixation eye movements, ITE Technical Report HI, 36, 13, 47, 50,   2012 03
  • Quantitative assessment of visually induced motion sickness based on the analysis of fixation eye movements, NAKAGAWA Kei, KOHAMA Takeshi, YOSHIDA Hisashi, KIKKAWA Sho, ITE Technical Report, 36, 13, 47, 50,   2012 02 28 , http://ci.nii.ac.jp/naid/110009437848
    Summary:In this study, we analyzed fixation eye movements immediately after watching certain length of movie contents which contain some factors to induce motion sickness. Motion sickness is defined as nausea, dizziness, vomiting and related symptoms caused by repetitive viewing of highly tremble movies. This symptom is caused by visual exposure; however, there is no evidence that motion sickness affects the dynamics of fixation eye movements. We apply a microsaccade rate analysis, a fluctuation energy analysis, and a random walk analysis to fixation eye movements for the purpose of evaluate the effects of motion sickness on the behavior of subjects objectively. The results show that the microsaccade rate and the fluctuation energy defined by root mean square of eye movements increase, and the dispersion of two-dimensional fixation paths varies widely in connection with deterioration of the symptoms. These results suggest that fixation eye movements could be a quantitative measure of motion sickness.
  • Arousal evaluation based on the analysis of microsaccade rate and pupil fluctuation, TANAKA Tatsuro, KOHAMA Takeshi, YOSHIDA Hisashi, ITE Technical Report, 36, 13, 51, 54,   2012 02 28 , http://ci.nii.ac.jp/naid/110009437849
    Summary:It is well known that decline of arousal level causes of poor performance of movements or judgments, while doing VDT work, driving cars, and so on, and also reduces productivity and safety. Previous studies show the slow eye movements (SEM) could be a candidate for an indicator of decline of arousal. However, since SEMs appear just prior to sleep onset, it is not sufficient to evaluate transition of arousal states. In this study, we examine the effects of the transition of arousal on microsaccade rate and pupil fluctuation while subjects are continuously gazing a fixation crosshair. The subjects are instructed to indicate by mouse-licks when they are aware of having slept. The eye movement and pupil fluctuation data are analyzed for the former period from SEMs, which are detected immediately before the mouse-clicks. The results show that longitudinal miosis of pupil diameter and gradual rise of microsaccade rate are observed in advance of the occurrence of SEMs. These resu Its suggest that the arousal level could be evaluated by monitoring eye movements and pupil fluctuations.
  • 離散パルス変換解析(DPT)によるマイクロサッカードの検出, NOGUCHI DAISUKE, KIKKAWA SHO, KOHAMA TAKESHI, YOSHIDA HISASHI, 日本生体医工学会大会プログラム・論文集(CD-ROM), 51st, ROMBUNNO.O1-10-7,   2012 , http://jglobal.jst.go.jp/detail.php?from=API&JGLOBAL_ID=201202247154842171
  • 12-2 Microsaccade detection with a order-statistic low-pass differentiation filter, NOGUCHI Daisuke, KOHAMA Takeshi, KIKKAWA Sho, YOSHIDA Hisashi, ITE Winter Annual Convention, 2011, 2011, 12, 2-1,   2011 12 21 , http://ci.nii.ac.jp/naid/110009598325
    Summary:In this study, we propose a new method to detect microsaccades using a order-statistic low-pass differentiation filter.The usual method need to trial and error processes to decide the threshold value. Our method can detect microsaccades over 90%accuracy by applying a dynamic threshold technique without any parameter tuning separately for each data.
  • 順序統計低域微分フィルタを用いたマイクロサッカードの検出, NOGUCHI DAISUKE, KOHAMA TAKESHI, KIKKAWA SHO, YOSHIDA HISASHI, 映像情報メディア学会冬季大会講演予稿集(CD-ROM), 2011, ROMBUNNO.12-2,   2011 11 30 , http://jglobal.jst.go.jp/detail.php?from=API&JGLOBAL_ID=201102255225147866
  • 覚醒維持状態における自律神経系解析, YOSHIDA HISASHI, システム制御情報学会研究発表講演会講演論文集(CD-ROM), 55th, ROMBUNNO.H25-5,   2011 05 17 , http://jglobal.jst.go.jp/detail.php?from=API&JGLOBAL_ID=201102225028151278
  • ユビキタス総合排尿機能診断機器の開発, HIRAO YOSHIHIKO, HIRAYAMA AKIHIDE, TORIMOTO KAZUTADA, IMAI MASAHARU, MATSUZAWA AKIRA, YOSHIDA HISASHI, YAGI YOSHIKI, 日本泌尿器科学会雑誌, 102, 2, 326,   2011 03 20 , http://jglobal.jst.go.jp/detail.php?from=API&JGLOBAL_ID=201102209654465920
  • マイクロサッカードと瞳孔径変動の解析に基づく覚醒水準の客観的評価, TANAKA TATSURO, KOHAMA TAKESHI, YOSHIDA HISASHI, 日本生体医工学会大会プログラム・論文集(CD-ROM), 50th, ROMBUNNO.O2-1-1,   2011 , http://jglobal.jst.go.jp/detail.php?from=API&JGLOBAL_ID=201102297133738960
  • A Statistical Analysis of Attentional Effects on Drift Eye Movements, KOHAMA TAKESHI, TAKENAKA HARUKA, YOSHIDA HISASHI, TODA NAOHIRO, 映像情報メディア学会誌, 64, 12, 1892, 1898,   2010 12 01 , 10.3169/itej.64.1892, http://jglobal.jst.go.jp/detail.php?from=API&JGLOBAL_ID=201002284178960742
  • タンパク質c‐Myb R2ドメインの高圧下におけるMDシミュレーション, 吉田久, 赤坂一之, システム制御情報学会研究発表講演会講演論文集(CD-ROM), 54th, ROMBUNNO.F12-3,   2010 05 19 , 10.11509/sci.SCI10.0.219.0, http://jglobal.jst.go.jp/public/201002223160494915
  • Positive Time-Frequency Distribution based on Copula Theory and Its Application (Time-Frequency Analysis and its applications), Yoshida Hisashi, Kikkawa Sho, RIMS Kokyuroku, 1684, 1684, 1, 12,   2010 04 , http://ci.nii.ac.jp/naid/110007583484
  • Positive time-frequency distribution based on copula theory and its application, 1, 12,   2010 04
  • 妊婦腹壁心電から胎児心電の効率的計測と分離, MORITA KOSUKE, FUJIMOTO ISAO, YOSHIDA HISASHI, SADO TOSHIYUKI, KOBAYASHI HIROSHI, 電気関係学会関西支部連合大会講演論文集(CD-ROM), 2009, ROMBUNNO.G10-9,   2009 10 28 , http://jglobal.jst.go.jp/detail.php?from=API&JGLOBAL_ID=200902296704605127
  • 不等間隔平滑化によるスペクトル推定, FUJIMOTO ISAO, KIKKAWA SHO, YOSHIDA HISASHI, 電気関係学会関西支部連合大会講演論文集(CD-ROM), 2009, ROMBUNNO.P-27,   2009 10 28 , http://jglobal.jst.go.jp/detail.php?from=API&JGLOBAL_ID=200902263018221406
  • 眠気に抗した覚醒維持状態における脳波および自律神経系の解析, 松山祐貴, 樋口拓哉, 吉田久, 生体・生理工学シンポジウム論文集, 24th, 427, 428,   2009 09 24 , http://jglobal.jst.go.jp/public/200902291380584421
  • A statistical model analysis of attentional effects on drift eye movements before and after microsaccades, TAKENAKA Haruka, KOHAMA Takeshi, YOSHIDA Hisashi, TODA Naohiro, ITE Technical Report, 33, 17, 61, 64,   2009 03 18 , http://ci.nii.ac.jp/naid/110007228007
    Summary:Resent studies have demonstrated the important roles of involuntary fixation eye movements in visual perception. While microsaccades and drift eye movements maintain fixation, they are modulated by the visual attention system, and emphasize high spatial-frequency components of the visual information. In this study, employing a parametrical approach involving the use of a statistical autoregressive model, we analyzed the characteristics of frequency-domain properties of the drift eye movements before and after the occurrence of microsaccades. The results indicated that the low frequency components of the drift eye movements were reinforced immediately after the microsaccades. This tendency was more prominent when visual attention was dispersed over the parafoveal visual field. These results suggest that microsaccades and drift eye movements are controlled by higher order brain functions so as to acquire details of the visual information from the peripheral vision.
  • 眠気に抗した覚醒維持状態における脳波‐血圧同時解析, MATSUYAMA YUKI, NOMURA KENTA, HIGUCHI TAKUYA, YOSHIDA HISASHI, 日本生体医工学会大会プログラム・論文集(CD-ROM), 48th, ROMBUNNO.25PMP7-2-18,   2009 , http://jglobal.jst.go.jp/detail.php?from=API&JGLOBAL_ID=200902295831014549
  • A spectral estimation method by non-equinterval smoothing of log periodogram, YOSHIDA HISASHI, FUJIMOTO ISAO, KIKKAWA SHO, Proc SPIE, 7074, 707411.1-707411.8,   2008 12 17 , 10.1117/12.801741, http://jglobal.jst.go.jp/detail.php?from=API&JGLOBAL_ID=200902227264803086
    Summary:We develop an automatic smoothing procedure for an estimate of the spectral density of a random process. The procedure is based on smoothing the periodogram with variable bandwidth and a spline interpolation. Effective varying bandwidth is obtained by approximating the log periodogram with a step function whose positions of level changes are determined using a dynamic programming technique. We show that the step function can be obtained by minimizing the cost function D(C|| μk ) for a given K. The number of partitions K also can be chosen by minimizing another cost function L(K). Some numerical examples show that the resulting estimates are shown to be good representations of the true spectra.
  • 瞬時等価帯域幅による眠気に抗した覚醒維持状態の脳波解析, SHIRASAWA KANAE, YANO TOMOFUMI, YOSHIDA HISASHI, NOMURA KENTA, KIKKAWA SHO, HIGUCHI TAKUYA, 電気関係学会関西支部連合大会講演論文集(CD-ROM), 2008, ROMBUNNO.P-28,   2008 10 29 , http://jglobal.jst.go.jp/detail.php?from=API&JGLOBAL_ID=200902231468395936
  • スプライン補間を用いた対数ペリオドグラムの不等間隔平滑化によるスペクトル推定, FUJIMOTO ISAO, KIKKAWA SHO, YOSHIDA HISASHI, 電気関係学会関西支部連合大会講演論文集(CD-ROM), 2008, ROMBUNNO.G10-16,   2008 10 29 , http://jglobal.jst.go.jp/detail.php?from=API&JGLOBAL_ID=200902228867207603
  • 情報論的ダイバージェンスによる等価帯域幅の提案と生体信号への応用, YOSHIDA HISASHI, KIKKAWA SHO, インテリジェント・システム・シンポジウム講演論文集, 18th, CD-ROM, ROMBUNNO.E1-2,   2008 10 23 , http://jglobal.jst.go.jp/detail.php?from=API&JGLOBAL_ID=200902266390257238
  • EEG Analysis in wakefulness Maintenance State against Sleepiness: Relationship between Gamma Frequencies and Muscle Activity, YOSHIDA HISASHI, SHIRASAWA KANAE, NOMURA KENTA, HIGUCHI TAKUYA, 生体・生理工学シンポジウム論文集, 23rd, 271, 272,   2008 09 28 , http://jglobal.jst.go.jp/detail.php?from=API&JGLOBAL_ID=200902206784604810
  • A-4-24 An Spectral Estimation Method of Non-Equinterval Smoothing of Log Periodogram, Fujimoto Isao, Yoshida Hisashi, Kikkawa Sho, Proceedings of the IEICE General Conference, 2008,   2008 03 05 , 10.1117/12.801741, http://ci.nii.ac.jp/naid/110006866949
  • 対数ペリオドグラムの不等間隔平滑化によるスペクトル推定, FUJIMOTO ISAO, YOSHIDA HISASHI, KIKKAWA SHO, 電子情報通信学会大会講演論文集, 2008, 114,   2008 03 05 , http://jglobal.jst.go.jp/detail.php?from=API&JGLOBAL_ID=200902252875744691
  • 自然入眠状態と眠気に抗した覚醒維持状態の脳波解析とその比較, SHIRASAWA KANAE, YANO TOMOFUMI, YOSHIDA HISASHI, KIKKAWA SHO, 日本生体医工学会大会プログラム・論文集(CD-ROM), 47th, ROMBUNNO.FC-2-1,   2008 , http://jglobal.jst.go.jp/detail.php?from=API&JGLOBAL_ID=200902259121731717
  • IPFMモデルにおける変調信号各種復調法の比較, TSUKAMOTO YUICHI, TANI SHIN'YA, HASHIZUME TATSUNORI, YOSHIDA HISASHI, KIKKAWA SHO, 電気関係学会関西支部連合大会講演論文集(CD-ROM), 2007, ROMBUNNO.G10-17,   2007 11 07 , http://jglobal.jst.go.jp/detail.php?from=API&JGLOBAL_ID=200902207927854312
  • Renyiのエントロピーから導かれるRange尺度及びPeak尺度の計算コストと分離性能―ICA簡素化と高速化に向けて―, SATO YUJI, YOSHIDA HISASHI, KIKKAWA SHO, 電気関係学会関西支部連合大会講演論文集(CD-ROM), 2007, ROMBUNNO.G10-16,   2007 11 07 , http://jglobal.jst.go.jp/detail.php?from=API&JGLOBAL_ID=200902231183496305
  • 眠気に抗した覚醒維持状態における脳波解析―瞬時等価帯域幅による解析―, YANO TOMOFUMI, SHIRASAWA KANAE, YOSHIDA HISASHI, SUNADA YUSUKE, KURAMOTO HARUKA, YOSHIKAWA AKIRA, 電気関係学会関西支部連合大会講演論文集(CD-ROM), 2007, ROMBUNNO.G10-19,   2007 11 07 , http://jglobal.jst.go.jp/detail.php?from=API&JGLOBAL_ID=200902235915404609
  • 確率過程における時間―周波数分布の周辺分布推定, FUJIMOTO ISAO, ISHIDA KAZUHIRO, YOSHIDA HISASHI, KIKKAWA AKIRA, 電気関係学会関西支部連合大会講演論文集(CD-ROM), 2007, ROMBUNNO.P-21,   2007 11 07 , http://jglobal.jst.go.jp/detail.php?from=API&JGLOBAL_ID=200902258996979287
  • EEG Analysis Based on Independent Component Analysis and Positive Time-Frequency Distribution, NAKASAKO NOBORU, YOSHIDA HISASHI, YAMAWAKI NOBUYUKI, Mem Sch Biol Orient Sci Technol Kinki Univ, 19, 23, 35,   2007 03 31 , http://jglobal.jst.go.jp/detail.php?from=API&JGLOBAL_ID=200902209575114499
  • A-4-1 Independent Component Analysis by Renyi's Mutual Information, Sato Yuji, Sonoda Hiroshi, Okouchi Takashi, Yoshida Hisashi, Kikkawa Sho, Proceedings of the IEICE General Conference, 2007,   2007 03 07 , http://ci.nii.ac.jp/naid/110006460017
  • D-7-20 EEG Analysis in the Wakefulness Maintenance State, Sunada Yusuke, Kuramoto Haruka, Yoshida Hisashi, Proceedings of the IEICE General Conference, 2007, 1,   2007 03 07 , http://ci.nii.ac.jp/naid/110006461550
  • 覚醒維持を課した状態の脳波解析, SUNADA YUSUKE, KURAMOTO HARUKA, YOSHIDA HISASHI, 電子情報通信学会大会講演論文集, 2007, 93,   2007 03 07 , http://jglobal.jst.go.jp/detail.php?from=API&JGLOBAL_ID=200902275947911105
  • Renyiのα次エントロピーによる独立成分分析(ICA), SATO YUJI, SONODA HIROSHI, OKOUCHI TAKASHI, YOSHIDA HISASHI, KIKKAWA SHO, 電子情報通信学会大会講演論文集, 2007, 112,   2007 03 07 , http://jglobal.jst.go.jp/detail.php?from=API&JGLOBAL_ID=200902257311721847
  • 各種分割点総当り画像2値化法の比較, EGAWA SUSUMU, SAIJO TOMOAKI, YOSHIDA HISASHI, KIKKAWA SHO, 電気関係学会関西支部連合大会講演論文集(CD-ROM), 2006, G14-1,   2006 11 15 , http://jglobal.jst.go.jp/detail.php?from=API&JGLOBAL_ID=200902280139923604
  • Wigner‐Ville分布による狭帯域過程の包絡線(時間周辺分布)の推定, ISHIDA KAZUHIRO, YOSHIDA HISASHI, KIKKAWA SHO, 電気関係学会関西支部連合大会講演論文集(CD-ROM), 2006, G11-16,   2006 11 15 , http://jglobal.jst.go.jp/detail.php?from=API&JGLOBAL_ID=200902235105832990
  • エントロピー帯域幅による心拍変動スペクトルの特徴付け, OGAWA HIROYOSHI, TAKAMOTO JUN, YANA KAZUO, YOSHIDA HISASHI, 日本生体医工学会大会プログラム・論文集, 45th, 445,   2006 05 15 , http://jglobal.jst.go.jp/detail.php?from=API&JGLOBAL_ID=200902246282510694
  • A Comparative Study of The Performance of Population Mixture Models for Image Thresholding, KIKKAWA SHO, MURATA KAZUMI, MASUMOTO TETSUYA, EKAWA SUSUMU, YOSHIDA HISASHI, Mem Sch Biol Orient Sci Technol Kinki Univ, 17, 7, 14,   2006 03 31 , http://jglobal.jst.go.jp/detail.php?from=API&JGLOBAL_ID=200902255102158806
  • A-2-18 Representational Capability of A Network Obtained by The Neurogenetic Learning Method, Kuroiwa Sho, Yoshida Hisashi, Proceedings of the IEICE General Conference, 2006,   2006 03 08 , http://ci.nii.ac.jp/naid/110006217144
  • コンピュータシミュレーションによるNGL獲得構造NNの学習能力に関する比較, KUROIWA SHO, YOSHIDA HISASHI, 電子情報通信学会大会講演論文集, 2006, 54,   2006 03 08 , http://jglobal.jst.go.jp/detail.php?from=API&JGLOBAL_ID=200902259283855835
  • A-6-10 Moving Average m-spacings and 2dim spacings Methods for Distribution Estimation, Uzaki Shusaku, Kikkawa Sho, Yoshida Hisashi, Proceedings of the IEICE General Conference, 2005,   2005 03 07 , http://ci.nii.ac.jp/naid/110004737906
  • A-6-11 A Test of Independence Based on the Renewal Process Power Spectrum, Ichibaya Minoru, Yoshida Hisashi, Kikkawa Sho, Proceedings of the IEICE General Conference, 2005,   2005 03 07 , http://ci.nii.ac.jp/naid/110004737907
  • D-12-46 Image Segmentation by Using ACO and GA, Sogawa Ryosuke, Yoshida Hisashi, Kikkawa Sho, Proceedings of the IEICE General Conference, 2005, 2,   2005 03 07 , http://ci.nii.ac.jp/naid/110004746376
  • 画像しきい値決定のためのMMICとMEPCの比較, EGAWA SUSUMU, MASUMOTO TETSUYA, YOSHIDA HISASHI, YOSHIKAWA AKIRA, 電子情報通信学会大会講演論文集, 2005, 125,   2005 03 07 , http://jglobal.jst.go.jp/detail.php?from=API&JGLOBAL_ID=200902229462480597
  • 分布推定のための移動平均m‐Spacings法と2次元spacings法, UZAKI SHUSAKU, KIKKAWA SHO, YOSHIDA HISASHI, 電子情報通信学会大会講演論文集, 2005, 172,   2005 03 07 , http://jglobal.jst.go.jp/detail.php?from=API&JGLOBAL_ID=200902233695854893
  • ACOとGAを組み合わせた画像の領域分割法, SOGAWA RYOSUKE, YOSHIDA HISASHI, KIKKAWA SHO, 電子情報通信学会大会講演論文集, 2005, 196,   2005 03 07 , http://jglobal.jst.go.jp/detail.php?from=API&JGLOBAL_ID=200902258145333546
  • 相互情報量基準値による弛緩法濃度レベルパラメータの設定―弛緩法による血液画像の血球検出―, TAKAHASHI TAKEHIRO, YOSHIKAWA AKIRA, YOSHIDA HISASHI, MASUMOTO TETSUYA, 電子情報通信学会大会講演論文集, 2005, 124,   2005 03 07 , http://jglobal.jst.go.jp/detail.php?from=API&JGLOBAL_ID=200902282624195601
  • 再生過程パワースペクトルに基づく乱数独立性検定, ICHIBAYA MINORU, YOSHIDA HISASHI, YOSHIKAWA SHO, 電子情報通信学会大会講演論文集, 2005, 173,   2005 03 07 , http://jglobal.jst.go.jp/detail.php?from=API&JGLOBAL_ID=200902263173021561
  • Copula-based positive time-frequency distributions of the phonocardiogram, Hisashi Yoshida, Tadashi Ikegami, Sho Kikkawa, Annual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings, pp. 388-391, 388, 391,   2004 12 01 , https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=11144247986&origin=inward
    Summary:This paper introduces a method for time-frequency analysis of the phonocardiogram. The proposed method is a modified version of the copula-based technique, which constructs positive time-frequency distributions, so as to be suitable for the analysis of periodically stationary random processes. The copula-based time-frequency distributions have some desirable properties: positivity, correct marginals and low computational cost. We use averaged spectrogram as a template in copula-based technique in order to construct a positive time-frequency distribution of the phonocardiogram. Results clearly show that the copula-based time-frequency distributions have much better resolution in time and frequency domain than the spectrogram does. Positivity and high resolution depend on the marginals of the distributions will offer excellent potential for estimating local parameters of the distributions, like a instantaneous frequency or instantaneous equivalent bandwidths using Renyi's divergence formulated by the authors.
  • Positive Time-Frequency distributions: A Least Square Approach and A Copula-based Approach, Yoshida Hisashi, Kikkawa Sho, Nakajima Hiroshi, Kira Naoto, Memoirs of the school of Biology-Oriented Science and Technology of Kinki University, 13, 13, 57, 71,   2004 02 28 , http://ci.nii.ac.jp/naid/110006423438
    Summary:Although the Wigner-Ville distribution (WVD) has many desirable properties, it has drawbacks : First, it is not positive. Second, it has large amount of cross terms. We present a least squares method (LSM) for generating a positive time-frequency distributions (TFDs) which belong to the Cohen-Zaparovanny positive distribution class. The positive distribution is as close as possible in the mean square sense to an arbitrary TFD or to a selected template constructed from bilinear TFDs. A simple example of two tones is given to illustrate that it is possible to obtain a positive distribution very close to a WVD and is contaminated with small cross terms. We also compare another method for constructing positive TFDs which is based on copula theory. We finally show a copula-based TFD applying to EEG signal.
  • A Pratical Algorithm for defecting O-ring Burrs, Uzaki Shusaku, Kikkawa Sho, Yoshida Hisashi, Fujii Teruya, Sugimoto Kiyoshi, Proceedings of the IEICE General Conference, 2003, 2,   2003 03 03 , http://ci.nii.ac.jp/naid/110003239721
  • O‐ringバリ検出のための実用的アルゴリズムの開発, UZAKI SHUSAKU, KIKKAWA SHO, YOSHIDA HISASHI, FUJII TERUYA, SUGIMOTO KIYOSHI, 電子情報通信学会大会講演論文集, 2003, 159,   2003 03 03 , http://jglobal.jst.go.jp/detail.php?from=API&JGLOBAL_ID=200902270780158360
  • Generalized equivalent bandwidth defined by using Rényi's entropy and its estimation, Hisashi Yoshida, Sho Kikkawa, Proceedings of SPIE - The International Society for Optical Engineering, 4791, 24, 32,   2002 12 01 , 10.1117/12.456495, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0036995260&origin=inward
    Summary:In this paper, we present the definition of a the generalized equivalent bandwidth(EBW) of a stochastic process. The generalized EBW is defined by W (α) = exp(H (α) )/2, where H (α) is Rényi's entropy H (α) = 1/1-α log ∫ -∞ ∞ p α (f)df, p(f) is the normalized power spectrum and α ≥ 0 is the order of the EWB. The generalized EBW is a new class of EBW which can represent major equivalent bandwidths uniformly. We also argue an interpretation of the generalized EBW from a different perspective. In latter of this article, we examine an estimation property of the generalized EBW. When we obtain a estimated smoothed power spectrum by using the convolution of periodogram and smoothing window, we evaluate how smothing window length, data length or the variance of an estimated spectrum affect estimation of the generalized EBW. The result indicates that if we increase the data length while keeping the variance constant, the increase rate of the generalized EBW caused by smoothing window will decrease. On the other hand, if we decrease the variance while holding the data length fixed, the generalized EBW of estimated power spectrum will increase.
  • Equivalent Bandwidth of a Random Process and Renyi's Entropy, Kikkawa Sho, Yoshida Hisashi, Proceedings of the IEICE General Conference, 2001,   2001 03 07 , http://ci.nii.ac.jp/naid/110003257002
  • Equivalent Bandwidth of Order α and Its Application to EEG Analysis, Yosida Hisashi, Tanaka Hirofumi, Kainuma Satoshi, Kikkawa Sho, Proceedings of the IEICE General Conference, 2001, 1,   2001 03 07 , http://ci.nii.ac.jp/naid/110003258910
  • α‐次等価帯域幅の脳波解析への応用, YOSHIDA HISASHI, TANAKA HIROFUMI, KAINUMA SATOSHI, KIKKAWA SHO, 電子情報通信学会大会講演論文集, 2001, 93,   2001 03 07 , http://jglobal.jst.go.jp/detail.php?from=API&JGLOBAL_ID=200902124547236877
  • 確率過程の等価帯域幅とRenyiのエントロピー, KIKKAWA SHO, YOSHIDA HISASHI, 電子情報通信学会大会講演論文集, 2001, 183,   2001 03 07 , http://jglobal.jst.go.jp/detail.php?from=API&JGLOBAL_ID=200902191740446861
  • Analysis and estimation of weather conditions and climate at local inclined area in Wakayama prefecture,   2001 03
  • Phonocardiogram classification using self-organizing map with learning vector quantization, Hisashi Yoshida, Hideaki Shinoi, Kazuo Yana, Annual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings, 2, 929,   1999 12 01 , https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0033323995&origin=inward
    Summary:This paper proposes a method for classifying the phonocardiogram (PCG) into three target classes (Type I: normal, Type II: innocent murmur, Type III: abnormal murmur). The method detects the presence of systolic murmur by the first self-organizing map with learning vector quantization algorithm. The second self-organizing map classifies the PCG into innocent and abnormal murmur. The effectiveness of the method was confirmed by applying the method to the data obtained from nation wide health screening for elementary school children conducted in Japan. The first stage of detecting the presence of systolic murmur achieves correcting rate of 99.4%, and correcting classification rates for innocent and abnormal murmur was 96.9% and 94.9% respectively. Furthermore, the proposed method not only has good performance of classifying the target classes, but also it could have ability to classify the systolic murmur into sub classes such as ejection murmur or musical murmur, etc. because of its structure of the system.
  • Changes in the Pupil Diameter Variability due to the Brightness Change., 河本潤, 青柳隆, 水田博久, 八名和夫, 吉田久, 電子情報通信学会大会講演論文集, 1998, 118,   1998 03 , http://jglobal.jst.go.jp/detail.php?from=API&JGLOBAL_ID=200902144748975890
  • Time domain methods for characterizing respiratory fluctuations of the heart rate: Linear stationary, non-stationary and non-linear approaches, K. Yana, H. Mizuta, H. Yoshida, J. P. Saul, R. J. Cohen, Studies in Health Technology and Informatics, 35, 89, 99,   1997 12 01 , 10.3233/978-1-60750-879-3-89, https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84887977444&origin=inward
    Summary:This paper introduces time domain methods for relating fluctuations in heart rate (HR) to respiration. Three methods: (1) linear stationary, (2) linear non-stationary and (3) non-linear approaches are described. (1) Experimental and signal processing contrivances called random breathing and noise injection methods enable the stable estimation of the impulse response of the HR to the instantaneous lung volume (ILV) signals. The comparison of the HR power spectra and the inpulse response revealed that the respiratory HR fluctuations are mostly affected by the parasympathetic autononic nervous activity. (2)Adaptive signal processing techniques enable recursive estimation of the impulse response, which allows us to keep track its temporal changes. Computer simulation confirmed the feasibility of the method in a practical situation. (3)An index called the degree of non-linearity (d.n.) has been introduced to evaluate how much non-linear the system is. Computer simulation confirmed the validity of the estimation method. Real data analysis showed that 30-35 % of the HR fluctuations associated with ILV cannot be predicted by the linear combination of ILV signals.
  • Phonocardiogram classification using time-frequency representation, Hideaki Shino, Hisashi Yoshida, Hirohisa Mizuta, Kazuo Yana, Annual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings, 4, 1636, 1637,   1997 12 01 , https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0031293564&origin=inward
    Summary:This paper introduces a method for classifying the systolic murmur using the time space representation of the phonocardiogram (PCG). The method detects the presence of systolic murmur by the first neural network utilizing variance sequences. Then the wavelet transform is applied to data classified as those with systolic murmur. The second neural net-work classifies the time-frequency distribution thus obtained into abnormal and innocent murmur. The proposed method was applied to the data obtained from the nation wide phono-cardiogram screening of the elementary school children conducted in Japan. Correct decision rate of 98% was achieved for the first stage of detecting the presence of systolic murmur. Correct classification rates for abnormal and innocent murmur were 78.6% and 84.5% respectively. The method would be useful in assisting medical doctors for making the final decision.
  • Instantaneous frequency analysis of systolic murmur for phonocardiogram, Hisashi Yoshida, Hideaki Shino, Kazuo Yana, Annual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings, 4, 1645, 1647,   1997 12 01 , https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0031294972&origin=inward
    Summary:This paper proposes the use of instantaneous frequency for the characterization of phonocardiogram, in the range from the first heart sound to systolic heart sound. The data were collected from nation wide phonocardiogram screening of the elementary school children conducted in Japan. We have estimated instantaneous frequency of the phonocardiogram from averaged Wigner-Ville distribution. The data analysis showed a different change of instantaneous frequency between innocent murmur and pathological murmur. It could provide a new method for classifying the systolic murmur into innocent murmur and pathological murmur.
  • Estimation of conditional index using the Volterra series., ONUMA TAKESHI, MIZUTA HIROHISA, YOSHIDA HISASHI, INOMATA NOZOMU, YANA KAZUO, 電子情報通信学会大会講演論文集, 1997, Sogo Pt 1, 183,   1997 03 , http://jglobal.jst.go.jp/detail.php?from=API&JGLOBAL_ID=200902136995462282
  • Conditional index of the degree of nonlinearity and its estimation using the Volterra series., MIZUTA HIROHISA, YOSHIDA HISASHI, ONUMA KEN, YANA KAZUO, 統計数理研究所共同研究リポート, 91, 41, 44,   1996 12 , http://jglobal.jst.go.jp/detail.php?from=API&JGLOBAL_ID=200902135108449173
  • Statistical properties of simultaneously recorded fluctuations in pupil diameter and heart rate, H. Yoshida, H. Mizuta, T. Gouhara, Y. Suzuki, K. Yana, F. Okuyama, Annual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings, 17, 165, 166,   1995 12 01 , https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0029428854&origin=inward
    Summary:This paper describes the relationship between fluctuations in pupil diameter (PD) and heart rate (HR). Simultaneous recording of PD, HR and Instantaneous lung volume (ILV) has been made for ten normal healthy subjects. The spectral analysis showed that the cross phase spectrum between PD and HR fluctuations had a constant value -π/2 over fairly long frequency range (0.1-0.4 Hz). In addition to this, we have observed that the power spectrum of the PD fluctuations showed 1/f 3 spectral pattern in the frequency range while the power spectrum of HR variability showed 1/f spectral pattern. This findings implies that HR variability is associated with the derivative of PD fluctuations and may be important for the characterization of PD fluctuations as an index to measure autonomic nervous activity.
  • Signal Processing and Interpretation of the Heart Rate Fluctuatsions., YANA KAZUO, MIZUTA HIROHISA, YOSHIDA HISASHI, 電気学会電子・情報・システム部門大会講演論文集, 1995, 1, 2,   1995 08 , http://jglobal.jst.go.jp/detail.php?from=API&JGLOBAL_ID=200902144843457960
  • 1/f3 Spectral Characteristic in Pupil Diameter Fluctuations., YOSHIDA HISASHI, UDAGAWA NORIKO, YANA KAZUO, 電子情報通信学会大会講演論文集, 1995, Sogo Pt 6, 196,   1995 03 , http://jglobal.jst.go.jp/detail.php?from=API&JGLOBAL_ID=200902193953753825
  • S/N Improvement of Signal Averaging using the Signal Emphasis Technique., KAJIYAMA RYUICHI, YOSHIDA HISASHI, MIZUTA HIROHISA, YANA KAZUO, 電子情報通信学会大会講演論文集, 1995, Sogo Pt 6, 207,   1995 03 , http://jglobal.jst.go.jp/detail.php?from=API&JGLOBAL_ID=200902164648782920
  • S/N Improvement of Signal Averaging using The Siganl Emphasis Technique., KAJIYAMA RYUICHI, YOSHIDA HISASHI, MIZUTA HIROHISA, YANA KAZUO, 法政大学計算センター研究報告, 8, 73, 79,   1995 , http://jglobal.jst.go.jp/detail.php?from=API&JGLOBAL_ID=200902131895580880
  • Time-varying properties of respiratory fluctuations in pupil diameter of human eyes, H. Yoshida, K. Yana, F. Okuyama, T. Tokoro, Methods of Information in Medicine, 33, 46, 48,   1994 01 01 , https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0028231535&origin=inward
    Summary:The time varying properties have been investigated of respiratory components in fluctuations of the pupil diameter (PDF) of the human eye. PDF and instantaneous lung volume were simultaneously measured for 45 minutes under natural binocular viewing conditions. The short-term Fourier transform and the autoregressive signal modeling together with the recursive least squares algorithm have been applied for the estimation of nonstationary power spectra. Data analysis showed a bursting type non-stationarity in the appearance of the respiratory component in PDF.
  • A Measure of the System Non-linearity and Its Estimation Using a Neural Network., YANA KAZUO, YOSHIDA HISASHI, KOMAI MASANORI, 電子情報通信学会論文誌 A, 76, 8, 1097, 1104,   1993 08 , http://jglobal.jst.go.jp/detail.php?from=API&JGLOBAL_ID=200902182237670666
  • Respiratory Fluctuations in Pupil Diameter of the Human Eye., YOSHIDA HISASHI, YANA KAZUO, OKUYAMA FUMIO, TOKORO TAKASHI, 電子情報通信学会論文誌 D-2, 76, 3, 776, 781,   1993 03 , http://jglobal.jst.go.jp/detail.php?from=API&JGLOBAL_ID=200902186015981340
  • An evidence of blood pressure and respiration originated variations in fluctuations of pupil diameter of the human eye, Kazuo Yana, F. Okuyama, H. Yoshida, S. Fukushima, T. Tokoro, Proceedings of the Annual Conference on Engineering in Medicine and Biology, 13, 472, 474,   1991 12 01 , https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0026374976&origin=inward
    Summary:Evidence is presented to prove the presence of blood-pressure- and respiration-originated variability in pupil diameter of the human eye. Fluctuations in pupil diameter, blood pressure and instantaneous lung volume were continuously and simultaneously recorded for three male subjects aged 22-23. Spectrum analysis was applied to the data. The results revealed a significant cross-spectral amplitude between fluctuations in pupil diameter and blood pressure or instantaneous lung volume. It is argued that these covariations can be utilized to investigate the autonomic control of the visual system.

Patents

  • Fetal cardiac potential signal extraction program, fetal cardiac potential signal discriminating apparatus, and pregnancy monitoring system using the same, KOBAYASHI Hiroshi, SADO Toshiyuki, YOSHIDA Hisashi, 特願US 13/951,274, 特許US 8,897,862 B2

Awards & Honors

  •   2011 05 , The Institute of Image Information and Television Engineers, Niwa-Takayanagi Awards, A Statistical Analysis of Attentional Effects on Drift Eye Movements

Research Grants & Projects

  • Ministry of Education, Culture, Sports, Science and Technology, Grants-in-Aid for Scientific Research(基盤研究(C)), An objective evaluation of the influence of ``undetectable motions'' on cognitive functions by the analyses of fixation eye movements, The purpose of this study is to evaluate the influence of ``undetectable motions'', the motion information under the perception threshold, on cognitive functions by statistical analyses of the property of fixation eye movements. Subjects performed rapid serial visual presentation (RSVP) tasks with undetectable or ambiguous motions in the background while maintaining their fixation. We evaluated the influence of these motions on top-down attention mechanism by analyzing fixation eye movements. The results suggest that microsaccade rates were correlated with subliminal motion information, and fluctuations of drift eye movements were modulated by low-contrast motions in the peripheral vision.
  • Ministry of Education, Culture, Sports, Science and Technology, Grants-in-Aid for Scientific Research(基盤研究(C)), Objective study of the influence of visual stimuli to the wakefulness maintenance state against sleepiness by using multi-channel bio-signal processing, We have measured multi-channel bio-signals, i. e., electroencephalogram, heart rate variability, blood pressure, eye movement and pupil diameter variability in order to evaluate the influence of visual stimuli to the wakefulness maintenance state against sleepiness. We performed time-frequency analysis, conventional spectral analysis, and feedback modeling to those signals. All results showed that physiological activities in wakefulness maintenance state have different features from those in onset of natural sleep. In addition, we have introduced new artifact removal methods to the EEG analysis.
  • Ministry of Education, Culture, Sports, Science and Technology, Grants-in-Aid for Scientific Research(基盤研究(C)), Modern signal and image analysis by generalized entropy, (1) We proposed a new mutual information criterion for deciding an optimal mixture distribution and an optimal threshold. (2) We proposed the usage of Renyi's alpha-entropy as a measure of width of marginal distribution and obtained very intuitive new and simple ICA methods. (3) We proposed an adaptive method for smoothing the periodogram for positive time-frequency representation. For impulse train time-frequency analysis, we proposed an inverse domain demodulation method of IPFM and an objective evaluation method for demodulators. Further, we proposed distance estimation method exploiting time-frequency feature of reflected signal from a moving object.
  • Ministry of Education, Culture, Sports, Science and Technology, Grants-in-Aid for Scientific Research(基盤研究(C)), Research on non-stationary signal processing by using equivalent bandwidths and its application to bio-signals, The objectives of the project are :1. To present a new class of generalized equivalent bandwidths▲(EBWs) of stationary random signals by using Renyi divergence including a spectral flatness measure,2. To define a new class of instantaneous equivalent bandwidths▲(IEBWs) for non-stationary random signals and obtain its estimation method,3. Application of the proposed methods, i.e. EBWs and IEBWs, to bio-signals.The results of the project are listed as follows.1. We have obtained a unified presentation of EBWs of random signals including spectral flatness measure which are well known in the field of speech processing introducing Renyi divergence2. We have proposed a new class of IEBWs for non-stationary random signals. IEBWs are defined on a positive time-frequency distribution based on Copula theory which is developed in statistics.3. We have developed the method for estimating frequency and time marginal of time-frequency distributions of non-stationary random signals.4. We have applied to the IEBW to EEG analysis. As a result, the proposed method can track the change of the bandwidth of the EEG signals in the periods between wakefulness state and wakefulness maintenance state against sleepiness. The EEG signal in the period of wakefulness maintenance state against sleepiness has wide bandwidth since it has high frequency components. The result is very interesting to understand a relationship between the prefrontal cortex which is a main area of activity and hypothalamus which controls sleep and wakefulness.
  • Ministry of Education, Culture, Sports, Science and Technology, Grants-in-Aid for Scientific Research(基盤研究(C)), New methods for signal and image processing by information theoretic divergence, 1. We proposed a unified class of equivalent bandwidths of a random process by using Renyi's a-order entropy. It is useful to evaluate randomness of a random process.2. We investigated global thresholding of a image. In addition to traditional one-step methods, we proposed a new idea of the two-steps method. In the first step of the method, you estimate the optimum model probability distribution that the grey-level variable obeys and in the second step you decide the optimum threshold to binarize the image. We propose a new binarization-oriented method for model distriobution fitting where we introduce class labels as hiden-variable and, instead of the traditional divergence measure, information theoretic mutual information measure is used. Simulation experiments shows our methodes are very powerful.
  • Ministry of Education, Culture, Sports, Science and Technology, Grants-in-Aid for Scientific Research(基盤研究(C)), Theory of Local parameters in Time-Frequency Analysis and its Applications to Tracking States of Mental Stress, The state of mental stress is often measured and estimated by using EEG and/or ECG. Since feature of these signals and the mental state change with time, we have to deal them as non-stationary data. Therefore we have to develop effective methods for non-stationary data analysis.The theory of time-frequency analysis is known as a powerful tool to analyze non-stationary signals like biomedical signals.In this project, we tried to find effective parameters by which we can extract essential characteristics of a random process and analyze and interpret the non-stationary signals. In the theory of random processes, many kind of effective bandwidths have been proposed and used very often in may branches. How ever there have been few effort to unity them. We proposed a general class of infinite effective bandwidths which includes all the essential traditional bandwidths. The class is defined by Renyi's alpha-order entropy and gives unified expression of the bandwidths. We call them alpha-order bandwidths, W-alpha. The concept of W-alpha is easily expand to non-stationary analysis. Then we proposed time varying W-alpha based of time-frequency distributions and showed that the time varying W-alpha is effective by simulation analysis. We applied them to EEG analysis measured from persons who are put mental stress by been a task of Uchida-Kraepelin. We showed the method is useful to track alpha-bandwidth of EEG.Meteorological conditions are essential factors which affect human mental state. In the late stage of this project, we began to develop methods to analyze meteorological data, that is, image data from some meteorological satellites, temperature data, rainfall data, etc. We tried apply information theoretical concepts, like entropy and divergence to our methods. We have been showing these information theoretical concepts are very powerful to our purpose.
  • Ministry of Education, Culture, Sports, Science and Technology, Grants-in-Aid for Scientific Research(基盤研究(C)), GLOBAL CORRELATION METHODS FOR FEATURING A RANDOM FIELD AND A MULTIDIMENSIONAL MULTIVARIATE TIME SERIES AND THEIR APPLICATIONS, (a)We defined statistical numbers of degrees of freedom (NDF) as an equivalent uncorrelated number of points per unit area in a 2-dimensional random field.(b)The first order NDF is equal to Fisher's information about the first statistical moment. The second order NDF is an approximation of Fisher's information about the second moment.(c)Many interesting features of a random field and a random process were deduced from the NDF's. They are correlation time, correlation length, correlation area, line-correlation, area-correlation, and bundle-correlation.(d)The mutual information and the vector correlation coefficient between two random processes are useful to measure how they are globally correlated. Relationship between mutual information and vector correlation were investigated both theoretically and numerically.(e)The results obtalned above were applied to annualizing some meteorological data and biomedical data.