Search results for: T. Emoto

Items from 1 to 20 out of 32 results

chapter

EEG Evaluation Method Using Nonlinear Modeling

M. Akutagawa, T. Murata, T. Emoto, Y. Kaji, more

IFMBE Proceedings > World Congress on Medical Physics and Biomedical Engineering, September 7 - 12, 2009, Munich, Germany > 2197-2200

An evaluation method for EEG (electroencephalogram) is described in this paper. The proposed method uses a kind of non-linear autoregressive model by use of MLP (multilayered perceptron). The MLPs are trained by observed signals for short term periods. When the training is completed, each MLP can be thought as a model of EEG generator. To evaluate the change of the generator, variation of connection...

chapter

The possibility of the classification about Ht values using the AR model

Y. Nitta, M. Akutagawa, T. Emoto, T. Okahisa, more

IFMBE Proceedings > World Congress on Medical Physics and Biomedical Engineering, September 7 - 12, 2009, Munich, Germany > 525-528

There are various blood purifications. Plasma Exchange(PE) is one of them. It is very important for medical workers to classify the changing Hematocrit(Ht) values during PE. Ht values have been obtained by CLIT-LINE monitor. Ht values mean the circulating blood volume. At present, the medical worker classifies the changing Ht values during the PE. The classification is depended on their experiment...

chapter

Investigation of a Classification about Time Series Signal Using SOM

Y. Nitta, M. Akutagawa, T. Emoto, T. Okahisa, more

IFMBE Proceedings > 13th International Conference on Biomedical Engineering > Bioinformatics; Biomedical Imaging; Biomedical instrumentation; Biosignal Processing; Digital Medicine; Neural Systems Engineering > 598-601

There are various blood purifications. Plasma Exchange(PE) is one of the blood purifications. A patient’s circulating blood volume is changing during the PE. Hence, the medical workers must treat to stabilize the circulating blood volume. They are the CLIT-LINE monitor (CLM) to obtain the hematocrit (Ht) values, because the circulating blood volume is calculated by Ht values. Ht value reflects the...

article

Evaluation of blood flow velocity waveform in common carotid artery using multi-branched arterial segment model of human arteries

M. Masuda, T. Emoto, A. Suzuki, M. Akutagawa, more

Biomedical Signal Processing and Control > 2013 > 8 > 6 > 509-519

Arteriosclerosis is considered to be a major cause of cardiovascular diseases, which account for approximately 30% of the causes of death in the world. We have recently demonstrated a strong correlation between arteriosclerosis (arterial elasticity) and two characteristics: maximum systolic velocity (S1) and systolic second peak velocity (S2) of the common carotid artery flow velocity waveform (CCFVW)...

chapter

Evaluating the atherosclerosis based on blood flow velocity waveform of common carotid artery

K. Aoyama, T. Emoto, M. Akutagawa, M. Masuda, more

Proceedings of 2012 IEEE-EMBS International Conference on Biomedical and Health Informatics > 655 - 658

2012 IEEE-EMBS International Conference on Biomedical and Health Informatics (BHI)

Throughout the world, there are a lot of patients who suffer from atherosclerosis leading to myocardial infarction and stroke etc. Cardio-ankle vascular index (CAVI) is well known as a screening tool for atherosclerosis. However, it requires a lot of sensors contacting the body. In this paper, we propose new method to evaluate the atherosclerosis based on four indices (SL, A, A_HR and A_S1I) obtained...

chapter

Study on blood flow velocity patterns at carotid using one-dimensional computer simulation of human arteries

M. Masuda, M. Akutagawa, T. Emoto, T. Kitawaki, more

Proceedings of 2012 IEEE-EMBS International Conference on Biomedical and Health Informatics > 651 - 654

2012 IEEE-EMBS International Conference on Biomedical and Health Informatics (BHI)

The purpose of this study is to reproduce blood flow velocity waveform in the middle of left common carotid artery (CCA) using one-dimensional mathematical model of major arteries of human. Compare with measured flow velocity waveform, results of simulation can reproduce similar waveform. Furthermore, we separate the simulated flow rate of the middle of CCA and investigate the structure of parameters...

chapter

The improved matching method to cell extract using ellipse template

M. Huangfu, S. Konaka, M. Akutagawa, T. Emoto

Proceedings of 2012 IEEE-EMBS International Conference on Biomedical and Health Informatics > 325 - 328

2012 IEEE-EMBS International Conference on Biomedical and Health Informatics (BHI)

Cell distributions between cancer tissue and normal tissue images are different. In this study, in order to distinguish the cancer image, image processing is used to extract cell nucleus from the images by techniques of an edge extraction and an elliptic ring template matching. The matching method is improved by one-pixel step moving and by calculating matching rates for both on-ring and in-ring....

article

Electron scattering based on a novel internal target technique: SCRIT

M. Wakasugi, T. Emoto, S. Ito, S. Wang, more

The European Physical Journal A > 2009 > 42 > 3 > 453-456

A novel technique for forming internal targets, named SCRIT (Self-Confining RI Ion Target), has been developed, which can make electron scattering off short-lived radioactive nuclei possible in an electron storage ring. SCRIT confines the ions of interest by utilizing the “ion trapping” phenomenon in the electron storage ring. Approximately 10⁷ stable ¹³³Cs ions were trapped in a three-dimensional...

chapter

Feature Extraction for Snore Sound via Neural Network Processing

T. Emoto, U.R. Abeyratne, M. Akutagawa, H. Nagashino, more

2007 29th Annual International Conference of the IEEE Engineering in Medicine and Biology Society > 5477 - 5480

29th Annual International Conference of the IEEE EMBS

Snore sound (SS) is the earliest and the most common symptom of Obstructive Sleep Apnea (OSA) which is a serious disease caused by the collapse of upper airways during sleep. SS should carry vital information on the state of the upper airways and is simple to acquire and rich in features but their analysis is complicated. In this study we use neural network (NN) based method to model SS via a simple...

article

MeV ion-induced strain at nanoisland-semiconductor surface and interfaces

J. Ghatak, B. Satpati, M. Umananda, P.V. Satyam, more

Nuclear Inst. and Methods in Physics Research, B > 2006 > 244 > 1 > 64-68

Strain at surfaces and interfaces play an important role in the optical and electronic properties of materials. MeV ion-induced strain determination in single crystal silicon substrates and in Ag (nanoisland)/Si(111) at surface/interfaces has been carried out using transmission electron microscopy (TEM) and surface-sensitive X-ray diffraction. Irradiation has been carried out with 1.5MeV Au ²⁺...

article

Characterization of ion beam induced nanostructures

J. Ghatak, B. Satpati, M. Umananda, D. Kabiraj, more

Nuclear Inst. and Methods in Physics Research, B > 2006 > 244 > 1 > 45-51

Tailoring of nanostructures with energetic ion beams has become an active area of research leading to the fundamental understanding of ion–solid interactions at nanoscale regime and with possible applications in the near future. Rutherford backscattering spectrometry (RBS), high resolution transmission electron microscopy (HRTEM) and asymmetric X-ray Bragg-rocking curve experimental methods have been...

article

Tracking the states of a nonlinear and nonstationary system in the weight-space of artificial neural networks

T. Emoto, M. Akutagawa, U. R. Abeyratne, H. Nagashino, more

Medical & Biological Engineering & Computing > 2006 > 44 > 1-2 > 146-159

We propose a novel interpretation and usage of Neural Network (NN) in modeling physiological signals, which are allowed to be nonlinear and/or nonstationary. The method consists of training a NN for the k-step prediction of a physiological signal, and then examining the connection-weight-space (CWS) of the NN to extract information about the signal generator mechanism. We define a novel feature, Normalized...

article

Strain relaxation near high-k/Si interface by post-deposition annealing

T. Emoto, K. Akimoto, Y. Yoshida, A. Ichimiya, more

Applied Surface Science > 2005 > 244 > 1-4 > 55-60

We studied the effect of post-deposition annealing on a HfO ₂ /Si interface of by extremely asymmetric X-ray diffraction.Comparing the rocking curves before annealing the sample with those of the annealed sample, it is found that an interfacial layer with a density of 3g/cm ³ grows at the interface between the HfO ₂ layer and the substrate during post-deposition annealing....

chapter

A Comparison of Neural network and Fast Fourier Transform-based Approach for the State Analysis of Brain

T. Emoto, M. Akutagawa, U.R. Abeyratne, H. Nagashino, more

2005 International Conference on Neural Networks and Brain > 1 > 94 - 99

Proceedings of 2005 International Conference on Neural Networks and Brain

Electroencephalogram (EEG) signals are used in medical field to assess the functional states of the brain. The state of brain is evaluated in the specified frequency domain by using EEG signals. Thus monitoring the state of brain involve notable characteristic. In this paper we propose a new neural network based technique to address those problems. We show that a feedforward, multi-layered neural...

article

Development and applications of grazing exit micro X-ray fluorescence instrument using a polycapillary X-ray lens

T. Emoto, Y. Sato, Y. Konishi, X. Ding, more

Spectrochimica Acta Part B: Atomic Spectroscopy > 2004 > 59 > 8 > 1291-1294

A polycapillary X-ray lens is an effective optics to obtain a μm-size X-ray beam for micro-X-ray fluorescence spectrometry (μ-XRF). We developed a μ-XRF instrument using a polycapillary X-ray lens, which also enabled us to perform Grazing Exit μ-XRF (GE-μ-XRF). The evaluated diameter of the primary X-ray beam was 48 μm at the focal distance of the X-ray lens. Use of this instrument enabled two-dimensional...

article

Lattice distortion due to surface treatment of bias sputtering revealed by extremely asymmetric X-ray diffraction

Y. Yoshida, K. Akimoto, T. Emoto, S. Kikuchi, more

Applied Surface Science > 2004 > 234 > 1-4 > 409-414

Strain fields near InGaP or GaAs surfaces due to bias sputtering (Ar plasma-ion irradiation) for surface cleaning were measured by using a strain-sensitive X-ray diffraction technique. An extremely asymmetric InGaP or GaAs 113 reflection of the sample was measured to observe strain fields. We found that strain fields near InGaP or GaAs surfaces due to bias sputtering are affected by the bias voltage...

article

Lattice distortion near InGaP compound semiconductor surface due to surface treatment of bias sputtering

T. Emoto, Y. Yoshida, K. Akimoto, A. Ichimiya, more

Applied Surface Science > 2003 > 216 > 1-4 > 83-87

Strain fields near InGaP surfaces due to bias sputtering are affected by the bias voltage used in this surface-cleaning treatment. Measured rocking curves of an InGaP113 reflection under grazing X-ray incidence conditions consisted of a main peak and broad sub peaks. The shape of the broad sub peaks was due to a compositional fluctuation near the subsurface. Changes in the main peak versus bias voltage...

article

Structural study of SiC(0 0 0 1)3x3 surface by surface X-ray diffraction

T. Aoyama, K. Akimoto, A. Ichimiya, Y. Hisada, more

Applied Surface Science > 2003 > 216 > 1-4 > 356-360

Surface structure of 6H-SiC(0001)3x3 reconstruction has been studied by grazing incidence X-ray diffraction with synchrotron radiation. We compared the Patterson map obtained from experimental structure factors with calculated Patterson maps estimated from the models that had been proposed. As the result, the calculated Patterson maps of Kulakov et al.'s [Surf. Sci. 346 (1996) 49] and Starke and coworkers'...

article

Strain due to nickel diffusion into hydrogen-terminated Si(111) surface

T. Emoto, K. Akimoto, A. Ichimiya, K. Hirose

Applied Surface Science > 2002 > 190 > 1-4 > 113-120

We studied the affection of thin (i.e., 0.2-0.8nm) Ni films on hydrogen-terminated Si(111) substrate surface by using strain-sensitive X-ray diffraction. It was reported that Ni deposition onto hydrogen-terminated Si surface apparently does not cause film growth, but rather diffuses into the Si crystal, creating an ''Ni diffusion layer'' up to Ni deposition 0.8nm thick. Measured rocking curves of...

article

Interface reconstructed structure of Ag/Si(111) revealed by X-ray diffraction

S. Horii, K. Akimoto, S. Ito, T. Emoto, more

Surface Science > 2001 > 493 > 1-3 > 194-199

We studied a buried interface reconstructed structure of the Ag/Si(111)3×3–Ag samples using grazing incidence X-ray diffraction with synchrotron radiation. We found that the 3 interface superstructure can be explained by an inequivalent-triangle (IET) model, which has been observed on the Si(111)3×3–Ag surface at low substrate temperatures by STM. The calculated structure factors of the IET model...

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Search results for: T. Emoto

EEG Evaluation Method Using Nonlinear Modeling

The possibility of the classification about Ht values using the AR model

Investigation of a Classification about Time Series Signal Using SOM

Evaluation of blood flow velocity waveform in common carotid artery using multi-branched arterial segment model of human arteries

Evaluating the atherosclerosis based on blood flow velocity waveform of common carotid artery

Study on blood flow velocity patterns at carotid using one-dimensional computer simulation of human arteries

The improved matching method to cell extract using ellipse template

Electron scattering based on a novel internal target technique: SCRIT

Feature Extraction for Snore Sound via Neural Network Processing

MeV ion-induced strain at nanoisland-semiconductor surface and interfaces

Characterization of ion beam induced nanostructures

Tracking the states of a nonlinear and nonstationary system in the weight-space of artificial neural networks

Strain relaxation near high-k/Si interface by post-deposition annealing

A Comparison of Neural network and Fast Fourier Transform-based Approach for the State Analysis of Brain

Development and applications of grazing exit micro X-ray fluorescence instrument using a polycapillary X-ray lens

Lattice distortion due to surface treatment of bias sputtering revealed by extremely asymmetric X-ray diffraction

Lattice distortion near InGaP compound semiconductor surface due to surface treatment of bias sputtering

Structural study of SiC(0 0 0 1)3x3 surface by surface X-ray diffraction

Strain due to nickel diffusion into hydrogen-terminated Si(111) surface

Interface reconstructed structure of Ag/Si(111) revealed by X-ray diffraction

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