Yumi Ogura
Delta Air Lines
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Yumi Ogura.
international conference of the ieee engineering in medicine and biology society | 2011
Kohji Murata; Etsunori Fujita; Shigeyuki Kojima; Shinitirou Maeda; Yumi Ogura; Tsutomu Kamei; Toshio Tsuji; Shigehiko Kaneko; Masao Yoshizumi; Nobutaka Suzuki
Systems capable of monitoring the biological condition of a driver and issuing warnings during instances of drowsiness have recently been studied. Moreover, many researchers have reported that biological signals, such as brain waves, pulsation waves, and heart rate, are different between people who have and have not consumed alcohol. Currently, we are developing a noninvasive system to detect individuals driving under the influence of alcohol by measuring biological signals. We used the frequency time series analysis to attempt to distinguish between normal and intoxicated states of a person as the basis of the sensing system.
ieee international conference on information technology and applications in biomedicine | 2009
Shigeyuki Kojima; Shinitirou Maeda; Yumi Ogura; Etsunori Fujita; Kohji Murata; Tsutomu Kamei; Toshio Tsuji; Shigehiko Kaneko; Masao Yoshizumi
Systems capable of monitoring the biological condition of a driver and issuing warnings during instances of drowsiness have recently been studied. Moreover, many researchers have reported that biosignals, such as brain waves, pulsation waves, and heart beat are different between people who have and have not consumed alcohol. Currently, we are developing a noninvasive system to detect individuals driving under the influence of alcohol by measuring biosignals. In this paper, a new algorithm to distinguish between the normal and intoxicated state of a person is proposed as the basic theory of the sensing system.
IEEE Transactions on Magnetics | 2001
Takashi Todaka; Masato Enokizono; Etsunori Fujita; Yumi Ogura
This paper presents results obtained in moving simulations for a new vibration system with permanent magnets. The magnetic field distributions, the force acting upon the permanent magnets and the vibration mechanism of the magneto-spring are made clear in solving the coupled problem of the magnetic field and motion equations. The developed magneto-spring works to keeping a constant resonance frequency without active control.
ieee international conference on condition monitoring and diagnosis | 2012
Harutoyo Hirano; Yusuke Komatsu; Yuichi Kurita; Ryuji Nakamura; Noboru Saeki; Masashi Kawamoto; Masao Yoshizumi; Abdugheni Kutluk; Shigeyuki Kojima; Yumi Ogura; Etsunori Fujita; Toshio Tsuji
This paper proposes an online biological signal measurement system with an air-pack-type pressure sensor (APS) to monitor the condition of supine patients from pulse activity. The system enables estimation of three physiological signals corresponding to pulse pressure waves, pulse beats and respiratory waves from measurements taken and filtered using the APS, which has mechanical characteristics similar to the impedance characteristics of human muscle and can also be fitted with a mattress pad to prevent decubitus. In this study, the physiological significance of signals obtained through the APS was determined by comparing them with signals measured using commercial medical devices. The results showed that the correlations of pulse pressure waves, pulse beats and power spectral densities for respiratory waves between signals measured using the APS and those measured using commercial sensors were 0.84, 0.84 and 0.98, respectively. It was therefore concluded that the proposed system is suitable for outputting pulse pressure waves, pulse beats and respiratory waves.
systems, man and cybernetics | 2008
Tiejun Miao; Yumi Ogura; Etsunori Fujita; Mayumi Oyama-Higa
This study developed an analytical method for estimating and presenting the rating of perceived exertion (RPE) by using fluctuation analysis of largest Lyapunov exponent and heart rate variability. The method was applied to method to analyze a series of experiments conducted in various conditions including the use of a variety of driving seats to observing exertion and fatigue processes during a longer sitting a seat. We described the generating rate of and driving cause of the fatigue processes, respectively, by differentiation and acceleration of the RPE relations. We further explored the acceleration by wavelet analysis and found characterizing categories in relation to individuals and conditions.
Archive | 1998
Etsunori Fujita; Hiroki Ohshimo; Shigeki Wagata; Masaki Nishino; Yumi Ogura; Kazuyoshi Chizuka; Shigeyuki Kojima; Taizo Nakata; Hidehiro Oda; Eiichi Koyama; Yoshiaki Nagae; Kazuhiro Ueda
Archive | 2004
Etsunori Fujita; Yumi Ogura; Naoki Ochiai; Yasunori Noto; Tiejun Miao; Toshiyuki Shimizu
Archive | 2005
Yoshinori Fujita; Yumi Ogura; 由美 小倉; 悦則 藤田
Archive | 2010
Etsunori Fujita; Yumi Ogura; Shinichiro Maeda; Naoki Ochiai
Archive | 2004
Etsunori Fujita; Hiroshi Nakahira; Yoshimi Enoki; Yumi Ogura