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Search Results: 1 - 10 of 3847 matches for " Shigeru Yamamoto "
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Development of ethical dilemma scale Japanese nurse faced physical restraints to elderly patients with dementia  [PDF]
Miwa Yamamoto, Masako Nakamura, Shigeru Sakuraba
Open Journal of Nursing (OJN) , 2013, DOI: 10.4236/ojn.2013.32027
Abstract:

Purpose: This study aimed to develop an ethical dilemma scale for nurses faced with the use of physical restraint when caring for elderly patients with dementia. Methods: We used a previously established 20-item dilemma scale. The objective and method of the study were explained to the head of nursing at 17 selected hospitals, and 121 nurses working in the general wards of 14 hospitals (excluding emergency department wards of psychiatry, pediatrics, obstetrics, outpatients, operating rooms and intensive care units) who agreed to participate were enrolled in 2000. Seventy-six nurses from one of the hospitals were selected after eight years (2008) to provide a comparison. Ethical considerations: The study was conducted with the approval of the ethics committee at Meiji University of Integrative Medicine. Results and discussion: Four factors were compared between 2000 and 2008: “execution of treatment and security”, “characteristic features in nursing of elderly patients with dementia”, “cooperative relationship in nursing”, and “priorities in nursing”. The cumulative contribution ratio was 65.3% (KMO = 0.77, p = 0.000) in 2000 and 72.5% (KMO = 0.78, p = 0.000) in 2008. Therefore, the scale dilemma nurse faced physical restraints to elderly patients with dementia in Japan was developed 4 facoters from 17-delremmas items of 20 items.

An Improvement on Data-Driven Pole Placement for State Feedback Control and Model Identification  [PDF]
Pyone Ei Ei Shwe, Shigeru Yamamoto
Intelligent Control and Automation (ICA) , 2017, DOI: 10.4236/ica.2017.83011
Abstract: The recently proposed data-driven pole placement method is able to make use of measurement data to simultaneously identify a state space model and derive pole placement state feedback gain. It can achieve this precisely for systems that are linear time-invariant and for which noiseless measurement datasets are available. However, for nonlinear systems, and/or when the only noisy measurement datasets available contain noise, this approach is unable to yield satisfactory results. In this study, we investigated the effect on data-driven pole placement performance of introducing a prefilter to reduce the noise present in datasets. Using numerical simulations of a self-balancing robot, we demonstrated the important role that prefiltering can play in reducing the interference caused by noise.
Survey on the Use of Information and Communication Technology Tools in Educating Caregivers of Elderly People with Dementia —Analysis from Ichushi and PubMed  [PDF]
Miwa Yamamoto, Noriko Adachi, Yasuko Maekawa, Tomoharu Nakashima, Shigeru Sakuraba
Open Journal of Nursing (OJN) , 2014, DOI: 10.4236/ojn.2014.45043
Abstract:


This study aimed to clarify the use of computer simulations in educating caregivers of elderly people with dementia. Thesaurus words in articles indexed in Ichushi and PubMed were analyzed using commercially available “Trend Search” text-mining software developed by FUJITSU. The analysis maps relational words in the articles, with line size and distance between words showing the strength of the relation. For ethical purposes, articles were anonymized for analysis. The search was conducted using the query phrases “elderly people with dementia AND simulation”, and retrieved four articles from Ichushi (2007-2010) and 16 from PubMed (1992-2012). The search results revealed that little research has been done on this subject, and highlighted opportunities to further investigate the use of ICT tools in educating caregivers of elderly people with dementia.


A Micromixer Using the Chaos of Secondary Flow: Rotation Effect of Channel on the Chaos of Secondary Flow  [PDF]
Yasutaka Hayamizu, Shinichiro Yanase, Shinichi Morita, Shigeru Ohtsuka, Takeshi Gonda, Kazunori Nishida, Kyoji Yamamoto
Open Journal of Fluid Dynamics (OJFD) , 2012, DOI: 10.4236/ojfd.2012.24A021
Abstract: The micromixer, which has a rotor with a curved channel, is studied experimentally. The secondary flow in a curved channel of rectangular cross-section is investigated using PIV (Particle Image Velocimetry) and LIF (Laser Induced Fluorescence) methods. Two walls of the channel (the inner and top walls) rotate around the center of curvature and a pressure gradient is imposed in the direction of the exit of the channel. The non-dimensional channel curvature δ=a/R is taken to be about 0.1, where 2a is the width of the channel, R the curvature radius of the channel. Other non-dimensional parameters concerned are the Dean number De=Reδ1/2, the Reynolds number Re=qdh/v, where q is the mean flow velocity in the channel axis direction, ν the kinematic viscosity, dh the hydraulic diameter of the channel, and the Taylor number Tr=2(2δ)1/2Ωa2/(δv), where Ω is the angular velocity of the rotor. Photographs of the flow in a cross-section at 180° downstream from the curved channel entrance are taken by changing the flux (De) at a constant rotational speed (Tr) of the channel walls. It is found that good mixing performance is obtained in the case of De≤0.1|Tr| and for that case secondary flows show chaotic behaviors. And then we have confirmed the occurrence of reversal of the mean axial flow.
Characteristics of soil respiration temperature sensitivity in a Pinus/Betula mixed forest during periods of rising and falling temperatures under the Japanese monsoon climate
Yusuke Oe,Akinori Yamamoto,Shigeru Mariko
Journal of Ecology and Field Biology , 2011,
Abstract: We studied temperature sensitivity characteristics of soil respiration during periods of rising and falling temperatureswithin a common temperature range. We measured soil respiration continuously through two periods (a period of fallingtemperature, from August 7, 2003 to October 13, 2003; and a period of rising temperature from May 2, 2004 to July 2,2004) using an open-top chamber technique. A clear exponential relationship was observed between soil temperatureand soil respiration rate during both periods. However, the effects of soil water content were not significant, becausethe humid monsoon climate prevented soil drought, which would otherwise have limited soil respiration. We analyzedtemperature sensitivity using the Q10 value and Rref (reference respiration at the average temperature for the observationperiod) and found that these values tended to be higher during the period of rising temperature than during theperiod of falling temperature. In the absence of an effect on soil water content, several other factors could explain thisphenomenon. Here, we discuss the factors that control temperature sensitivity of soil respiration during periods of risingand falling temperature, such as root respiration, root growth, root exudates, and litter supply. We also discuss how thecontribution of these factors may vary due to different growth states or due to the effects of the previous season, despitea similar temperature range.
A Micromixer Using the Taylor-Dean Flow: Effect of Inflow Conditions on the Mixing  [PDF]
Toshihiko Kawabe, Yasutaka Hayamizu, Shinichiro Yanase, Takeshi Gonda, Shinichi Morita, Shigeru Ohtsuka, Kyoji Yamamoto
Open Journal of Fluid Dynamics (OJFD) , 2014, DOI: 10.4236/ojfd.2014.45037
Abstract: Chaotic mixing in a curved-square channel flow is studied experimentally and numerically. Two walls of the channel (inner and top walls) rotate around the center of curvature and a pressure gradient is imposed in the direction toward the exit of the channel. This flow is a kind of Taylor-Dean flows. There are two parameters dominating the flow, the Dean number De (∝ the pressure gradient or the Reynolds number) and the Taylor number Tr (∝ the angular velocity of the wall rotation). In the present paper, we analyze the physical mechanism of chaotic mixing in the Taylor-Dean flow by comparing experimental and numerical results. We produced a micromixer model of the curved channel several centimeters long with square cross section of a few millimeters side. The secondary flow was measured using laser induced fluorescence (LIF) method to examine secondary flow characteristics. We also performed three-dimensional numerical simulations for the exactly same configuration as the experimental system to study the mechanism of chaotic mixing. It is found that good mixing performance is achieved for the case of De ≤ 0.1Tr, and that mixing efficiency changes according to the difference in inflow conditions. The flow is studied both experimentally and numerically, and both results agree with each other very well.
A Micromixer Using the Taylor-Dean Flow: Effects of Aspect Ratio and Inflow Condition on the Mixing  [PDF]
Yasutaka Hayamizu, Toshihiko Kawabe, Shinichiro Yanase, Takeshi Gonda, Shinichi Morita, Shigeru Ohtsuka, Kyoji Yamamoto
Open Journal of Fluid Dynamics (OJFD) , 2015, DOI: 10.4236/ojfd.2015.53027
Abstract: Chaotic mixing in three different types of curved-rectangular channels flow has been studied experimentally and numerically. Two walls of the channel (inner and top walls) rotate around the center of curvature and a pressure gradient are imposed in the direction toward the exit of the channel. This flow is a kind of Taylor-Dean flow. There are two parameters dominating the flow, the Dean number De (∝ the pressure gradient or the Reynolds number) and the Taylor number Tr (∝ the angular velocity of the wall rotation). In this paper, we analyze the physical mechanism of chaotic mixing in the Taylor-Dean flow by comparing experimental results and numerical ones. We produced three micromixer models of the curved channel, several centimeters long, with rectangular cross-section of a few millimeters side. The secondary flow is measured using laser induced fluorescence (LIF) method to examine secondary flow characteristics. Also we performed three-dimensional numerical simulations with the open source CFD solver, OpenFOAM, for the same configuration as the experimental system to study the mechanism of chaotic mixing. It is found that good mixing performance is obtained in the case of De ≤ 0.1 Tr, and it becomes more remarkable when the aspect ratio tends to large. And it is found that the mixing efficiency changes according to the aspect ratio and inflow condition.
Bayesian Calibration of Simultaneity in Audiovisual Temporal Order Judgments
Shinya Yamamoto, Makoto Miyazaki, Takayuki Iwano, Shigeru Kitazawa
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0040379
Abstract: After repeated exposures to two successive audiovisual stimuli presented in one frequent order, participants eventually perceive a pair separated by some lag time in the same order as occurring simultaneously (lag adaptation). In contrast, we previously found that perceptual changes occurred in the opposite direction in response to tactile stimuli, conforming to Bayesian integration theory (Bayesian calibration). We further showed, in theory, that the effect of Bayesian calibration cannot be observed when the lag adaptation was fully operational. This led to the hypothesis that Bayesian calibration affects judgments regarding the order of audiovisual stimuli, but that this effect is concealed behind the lag adaptation mechanism. In the present study, we showed that lag adaptation is pitch-insensitive using two sounds at 1046 and 1480 Hz. This enabled us to cancel lag adaptation by associating one pitch with sound-first stimuli and the other with light-first stimuli. When we presented each type of stimulus (high- or low-tone) in a different block, the point of simultaneity shifted to “sound-first” for the pitch associated with sound-first stimuli, and to “light-first” for the pitch associated with light-first stimuli. These results are consistent with lag adaptation. In contrast, when we delivered each type of stimulus in a randomized order, the point of simultaneity shifted to “light-first” for the pitch associated with sound-first stimuli, and to “sound-first” for the pitch associated with light-first stimuli. The results clearly show that Bayesian calibration is pitch-specific and is at work behind pitch-insensitive lag adaptation during temporal order judgment of audiovisual stimuli.
Occurrence of Hyperon Superfluidity in Neutron Star Cores
Tatsuyuki Takatsuka,Shigeru Nishizaki,Yasuo Yamamoto,Ryozo Tamagaki
Physics , 2006, DOI: 10.1143/PTP.115.355
Abstract: Superfluidity of $\Lambda$ and $\Sigma^-$ admixed in neutron star (NS) cores is investigated realistically for hyperon ($Y$)-mixed NS models obtained using a $G$-matrix-based effective interaction approach. Numerical results for the equation of state (EOS) with the mixing ratios of the respective components and the hyperon energy gaps including the temperature dependence are presented. These are meant to serve as physical inputs for $Y$-cooling calculations of NSs. By paying attention to the uncertainties of the EOS and the $YY$ interactions, it is shown that both $\Lambda$ and $\Sigma^-$ are superfluid as soon as they appear although the magnitude of the critical temperature and the density region where superfluidity exists depend considerably on the $YY$ pairing potential. Considering momentum triangle condition and the occurrence of superfluidity, it is found that a so-called `` hyperon cooling\rq\rq~(neutrino-emission from direct Urca process including $Y$) combined with $Y$-superfluidity may be able to account for observations of the colder class of NSs. It is remarked that $\Lambda$-hyperons play a decisive role in the hyperon cooling scenario. Some comments are given regarding the consequences of the less attractive $\Lambda\Lambda$ interaction recently suggested by the `` NAGARA event\rq\rq~$^6_{\Lambda\Lambda}$He.
Seismic Damage Estimation of an Actual Reinforced Concrete Structure Using Subset MCMC  [PDF]
Shigeru Kushiyama
Open Journal of Civil Engineering (OJCE) , 2013, DOI: 10.4236/ojce.2013.33016
Abstract:

To estimate seismic damage of structures under strong motions is very important to know true safety of structures. However, we have to deal with very small failure probability issue to investigate quantitatively. If we use standard MCS (Monte Calro Simulation) to discuss failure probability, e.g., 1 × 10-6 order, since we have to execute nonlinear dynamic response analyses of approximate 107 times, it is not realistic. Recently, a subset simulation, which reduces the computation time by replacing small failure probability into the product of conditional failure probabilities, was proposed. In this study, the subset simulation is applied to estimate failure probability of an actual reinforced concrete building with 11 stories, and discuss the safety of the structure by checking with design criteria.

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