A5101787795- Ferroelectric and Piezoelectric Materials
- Ferroelectric and Negative Capacitance Devices
- Phonetics and Phonology Research
- Semiconductor materials and devices
- Speech Recognition and Synthesis
- Advanced Memory and Neural Computing
- Electronic and Structural Properties of Oxides
- Functional Brain Connectivity Studies
- Neuropeptides and Animal Physiology
- Acoustic Wave Resonator Technologies
- Neuroscience of respiration and sleep
- Advanced MRI Techniques and Applications
- Heart Rate Variability and Autonomic Control
- Neural dynamics and brain function
- Handwritten Text Recognition Techniques
- Voice and Speech Disorders
- Visual perception and processing mechanisms
- Non-Invasive Vital Sign Monitoring
- Vagus Nerve Stimulation Research
- Industrial Vision Systems and Defect Detection
- Combustion and flame dynamics
- Patient-Provider Communication in Healthcare
- Fluid Dynamics and Turbulent Flows
- Receptor Mechanisms and Signaling
- Neural and Behavioral Psychology Studies
National Institute of Information and Communications Technology
2024
National Cancer Center Hospital East
2013
Imaging Center
2005-2012
Cranfield University
2009-2011
Panasonic (Japan)
1996-2009
Fuji Xerox (Japan)
2009
Hosei University
2008
Nagoya University
1990-2007
Advanced Telecommunications Research Institute International
2003-2005
Okayama University of Science
1989-2004
When collecting large amounts of neuroimaging data associated with psychiatric disorders, images must be acquired from multiple sites because the limited capacity a single site. However, site differences represent barrier when acquiring multisite data. We utilized traveling-subject dataset in conjunction multisite, multidisorder to demonstrate that are composed biological sampling bias and engineering measurement bias. The effects on resting-state functional MRI connectivity based pairwise...
Abstract Machine learning classifiers for psychiatric disorders using resting-state functional magnetic resonance imaging (rs-fMRI) have recently attracted attention as a method directly examining relationships between neural circuits and disorders. To develop accurate generalizable classifiers, we compiled large-scale, multi-site, multi-disorder neuroimaging database. The database comprises fMRI structural images of the brain from 993 patients 1,421 healthy individuals, well demographic...
The role of vertical larynx movement in vocal frequency (F0) change has attracted the attention many researchers. Recently, Hirai, Honda, Fujimoto, and Shimada (1994) proposed a mechanism F0 control by based on measurement magnetic resonance images (MRI). In changes, moves vertically along cervical spine, which displays anterior convexity (lordosis) at level larynx. Therefore, results rotation cricoid cartilage fold tension changes. present study reexamines above qualitative analysis...
A 3D cine-MRI technique was developed based on a synchronized sampling method [Masaki et al., J. Acoust. Soc. Jpn. E 20, 375–379 (1999)] to measure the temporal changes in vocal tract area function during short utterance /aiueo/ Japanese. time series of head-neck volumes obtained after 640 repetitions produced by male speaker, from which functions were extracted frame-by-frame. region-based analysis showed that front and back cavities tend change reciprocally areas near larynx posterior edge...
The magnetic resonance imaging (MRI) technique is primarily used to obtain still pictures of body sections, but it also provides a practical means for motion imaging. In this work, the synchronized sampling method originally developed cardiac was applied recording articulatory movements while subject repeated short utterance with scan sequence. Results showed dynamic ofthe speech organs in midsagittal plane. A few key frames from movie sequence are presented as an example its application...
Perceptual organisation must select one interpretation from several alternatives to guide behaviour. Computational models suggest that this could be achieved through an interplay between inhibition and excitation across competing types of neural population coding for each interpretation. Here, test such models, we used magnetic resonance spectroscopy measure non-invasively the concentrations inhibitory γ-aminobutyric acid (GABA) excitatory glutamate-glutamine (Glx) in brain regions. Human...
Tatsuya Kitamura , Hironori Takemoto, Kiyoshi Honda, Yasuhiro Shimada, Ichiro Fujimoto, Yuko Syakudo, Shinobu Masaki, Kagayaki Kuroda, Noboru Oku-uchi and Michio Senda ATR Human Information Science Laboratories, 2–2–2 Hikaridai, ‘‘Keihanna City,’’ Kyoto, 619–0288 Japan Brain Activity Imaging Center, The Institute of Biomedical Research Innovation, 2–2 Minatojima Minamimachi, Chuo-ku, Kobe, 650–0047
We have developed a low-temperature formation technique for ferroelectrics (<500 °C), which is crucial the ferroelectric random access memory (FeRAM) to be embedded in leading-edge complementary metal oxide semiconductor (CMOS). A 53-nm-thick Bi4Ti3O12 film was successfully formed by metalorganic chemical vapor deposition at 450 °C and subsequent annealing 500 °C. It found that perovskite grains preferentially orient along (110) (111) directions fabricated capacitors show remnant...
Nonvolatile memory utilizing ferroelectric material is expected to be the ultimate due its theoretical low power operation and fast access. We integrated a thin film using standard complementary metal-oxide-semiconductor (CMOS) process evaluated basic characteristics reliability including endurance imprint effect. The was prepared spin-on sol-gel method. A formed liquid source misted chemical deposition (LSMCD) found have almost same as those of by No effects on CMOS transistors were...
Temperature-dependent current-voltage characteristics of fully processed Ba 0.7 Sr 0.3 TiO 3 thin film capacitors integrated in a charge-coupled device delay-line processor as bypass were studied. The with thickness 185 nm formed by metal-organic decomposition processing. leakage current measured after completion the integration process was 1 to 2 orders magnitude higher than that capacitor patterning. at low voltages (<1 V, 50 kV/cm) indicated ohmic conduction within temperature range...
Objectives To visualize articulatory movement using a magnetic resonance imaging (MRI) movie of subject with cleft lip and palate (CLP) to demonstrate the usefulness this method for studying oropharyngeal function. Material Methods Dynamic changes in structures were assessed an MRI man normal adult male volunteer during articulation /pa/, /ta/, /ka/. Results Conclusions Different patterns observed CLP compared volunteer. Posterosuperior tongue anterior posterior pharyngeal wall clearly...
Recent studies have shown that interindividual variability can be a rich source of information regarding the mechanism human visual perception. In this study, we examined mechanisms underlying in perception motion, one fundamental components scene analysis, by measuring neurotransmitter concentrations using magnetic resonance spectroscopy. First, psychophysically examining two types motion phenomena—motion assimilation and contrast—we found that, following presentation same stimulus, some...
Temperature effects on charge retention characteristics of integrated SrBi2(Ta,Nb)2O9 thin film capacitors were examined in the temperature range 27–150°C. The decay remanent polarization at 27°C was linear logarithmic time from 10−3 to 105 s with a rate 0.24 μC/cm2 per decade. elevation storage resulted an instantaneous decrease polarization, while elevated temperatures after as small that 27°C. caused by elevating explained dependence spontaneous vicinity second order transition...
The authors evaluated the accuracy of a system to measure respiratory gas exchange on an on-line basis by comparing it with collection method. incorporates hot-wire flowmeter, mass spectrometer, and microcomputer. It performs compensation for both transport delay dynamic response spectrometer. Compensation flow measurement changing fractions also is performed. Excellent linear correlations were obtained between two methods: 1) in animals during mechanical ventilation room air (VO2:r = 0.995;...
Time-dependent leakage current behavior of integrated Ba 0.7 Sr 0.3 TiO 3 capacitors accelerated by stresses in excess operating temperature and voltage was studied. Current-voltage ( J - V ) studies revealed that the time-dependent behaviors are different according to initial conduction process. When a fully processed capacitor at high voltages elevated temperatures is Frenkel-Poole emission type, increases rapidly with time. The difference currents related film growth conditions which...
We investigated the origin of retention failure in ferroelectric memories (FeRAMs) with SrBi 2 (Ta, Nb) O 9 (SBTN) memory cell capacitors by considering time-dependent behavior polarization vs. voltage ( P - V ) curves during high-temperature storage. Since SBTN exhibited no marked decrease nonvolatile component even after storage, we focused on effect shift observed curves. calculated bitline along storage from and capacitance, successfully estimated a voltage, which is agreement FeRAMs. In...
A nondestructive readout (NDRO) FeRAM using a 0.18-/spl mu/m CMOS technology has been developed. Readout voltages across the ferroelectric lower than coercive voltage allowed to achieve high read endurance exceeding required performance for system LSIs, 10/sup 16/ cycles. The NDRO approach uses newly developed charge compensation technique correct process variations in threshold of neighboring transistors, leading wide operation margin over supply range from 1.1 1.8 V.
The polarization decay process in SrBi 2 (Ta, Nb) O 9 capacitors and retention characteristics of a 288-bit ferroelectric memory device fabricated from were studied. remanent at room temperature showed good linearity when plotted against logarithmic time over wide range 10 -3 –10 5 s. distribution times to failure was fit model having linear relationship between log (log t f ) 1/ T for the period infant failures Arrhenius form vs random failures, where is temperature. activation energy found...
The present study was undertaken to evaluate the role of sympathetic nerves in increasing lung vascular permeability. An isolated rat nerve-lung preparation used. Three minutes after an increase weight induced by elevating intravascular pressure, stimulation performed presence papaverine, which further increased a graded manner. After nerve stimulation, deposits carbon were observed alveolar macrophages and perivascular walls, indicating response altered, depending on magnitude pressure...
The present study was undertaken to evaluate roles of nitric oxide in the central nervous system development neurogenic pulmonary edema. Nitric donor compounds have been reported be effective for controlling some kinds edema.Randomized trial.Experimental university pharmacology laboratory.Wistar rats anesthetized with pentobarbital.Neurogenic edema induced by injections fibrinogen and thrombin into cisterna magna. Physiologic were evaluated using NG-nitro-l-arginine methyl ester (a synthase...
Previously, in vivo studies showed that neuropeptide Y (NPY) elevates vascular permeability isolated lung perfusion preparations, possibly through binding to the NPY Y(3) receptor. The present study used monolayers a double-chamber culture method under conditions of normoxia (5% CO(2)-20% O(2)-75% N(2)) or hypoxia CO(2)-5% O(2)-90% test hypothesis directly affects rat aortic endothelial cells (RAECs). RAECs were cultured on base upper chamber, into which FITC-labeled albumin was introduced,...
Near infrared (NIR) spectroscopy, a non-invasive optical method for monitoring hemodynamics, was applied to record evoked auditory response of the human brain. Our newly developed system detected amount oxygenated and deoxygenated hemoglobin in area local brain located beneath probes. In study, we used magnetoencephalography (MEG) NIR spectroscopy observe blood component change near cortex. The sound stimulus 1 kHz sine wave at 70 dB SPL elicit responses both experiments. active region...