Search results for: T. Yamakoshi

Items from 1 to 20 out of 34 results

chapter

Substitution effect of Ba at the Sr sites in Sr(Fe,Re)O₃

T. Yamakoshi, K. Nomura, T. Kitamori, J. Shimoyama, more

ISIAME 2008 > 405-410

Substitution effect in double perovskites, Sr(FeRe)O₃ (SFRO), was studied by Mössbauer spectroscopy and magnetization measurements. The samples were prepared by a sol–gel method. The fraction of alternately ordered Fe1 for SFRO is 72%, and the magnetization measured is consistent with $3\times 0.72=2.16{\mu_B } \mathord{\left/ {\vphantom {{\mu _B } {\mbox{f}.\mbox{u}.}}} \right. \kern-\nulldelimiterspace} {\mbox{f}.\mbox{u}.}$ ...

chapter

An Improved Local Pressurization-Cuff Technique for Non-invasive Digital Arterial Pressure by the Volume-Compensation Method: Its Performance and Evaluation of Accuracy

A. Ikarashi, M. Nogawa, T. Yamakoshi, S. Tanaka, more

IFMBE Proceedings > 4th European Conference of the International Federation for Medical and Biological Engineering > Bioinstrumentation and Medical Devices > 1141-1144

The volume-oscillometric and volume-compensation methods, previously developed by us, are a useful and helpful means for non-invasive measurement of blood pressure. These methods are usually applied for digital arterial pressure measurement. During the continuous measurement of finger arterial pressure by the volume-compensation method, a band-type cuff wrapped around the finger has been conventionally...

chapter

Multivariate Calibration Models to Classify Blood Glucose Levels Non-invasively Based on A New Optical Technique Named Pulse Glucometry

Y. Yamakoshi, M. Ogawa, T. Yamakoshi, T. Tamura, more

IFMBE Proceedings > World Congress on Medical Physics and Biomedical Engineering, September 7 - 12, 2009, Munich, Germany > 469-472

A novel optical technique for the non-invasive in vivo blood glucose concentration (BGL) measurement, named “Pulse glucometry”, was combined with two discriminant analyses using Artificial Neural Network (ANN) and Support Vector Machines Classification (SVMs). The total transmitted radiation intensity (I^λ) and the cardiac-related pulsatile changes superimposed on I...

chapter

A new calibration method with support vector machines for pulse oximetry

M. Ogawa, Y. Yamakoshi, M. Nogawa, T. Yamakoshi, more

IFMBE Proceedings > 4th European Conference of the International Federation for Medical and Biological Engineering > Bioinstrumentation and Medical Devices > 1125-1127

A novel calibration method using support vector machines regression (SVMsR) of pulse oximetry was proposed and attempted. Conventional calibration method of pulse oximetry that based on an optical density ratio of transmitted visible red light and infrared radiation whereas a proposed method here was not based on the optical density ratio directly. In theory, conventional calibrations using the ratio...

chapter

Levels of Salivary Chromogranin-A Secreted During Simulated Monotonous Driving Stress

T. Yamakoshi, S. B. Park, W. C. Jang, K. Kim, more

IFMBE Proceedings > World Congress on Medical Physics and Biomedical Engineering, September 7 - 12, 2009, Munich, Germany > 275-278

Salivary Chromogranin-A (CgA) was recently reported to be a useful biochemical marker of stress. The purpose of the present study was to evaluate the use of salivary CgA, which is already used in general as a mental stress marker, in response to the stressful situation created by simulated monotonous driving. After informed consent 25 healthy male & female subjects were studied, under constant...

chapter

An attempt of new calibration method with support vector machines regression for pulse oximetry

M. Ogawa, Y. Yamakoshi, M. Nogawa, T. Yamakoshi, more

IFMBE Proceedings > World Congress on Medical Physics and Biomedical Engineering, September 7 - 12, 2009, Munich, Germany > 465-468

A novel calibration method using support vector machines regression (SVMsR) of pulse oximetry was proposed and attempted. Conventional calibration method of pulse oximetry that based on an optical density ratio of transmitted visible red light and infrared radiation whereas a proposed method here was not directly based on the optical density ratio. From theoretical point of view, conventional calibrations...

chapter

Development of a new aortoscope system for the use of endovascular intervention

S. Tanaka, T. Suzuki, T. Iida, N. Tanaka, more

2012 Annual International Conference of the IEEE Engineering in Medicine and Biology Society > 5765 - 5768

2012 34th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

“Balloon aortoscopy” is a technique for viewing inner wall of aorta and used in clinics [1, 2]. By this method, endoluminal aortic surface could be clearly monitored, however, during this period, the aortic blood flow is blocked off by the inflated balloon. To solve this clinical problem, we have been developing a prototype aortoscope system without blocking off aortic flow aiming for the use of an...

article

Blaschkoid distribution of cylindromas in a germline CYLD mutation carrier

M. Furuichi, T. Makino, T. Yamakoshi, K. Matsui, more

British Journal of Dermatology > 166 > 6 > 1376 - 1378

chapter

A new proposal of tailored bioinstrumentation using rapid prototyping and three-dimensional CAD — First trial to develop individually designed cuff-units for continuous blood pressure measurement

M. Ogawa, K. Motoi, T. Yamakoshi, M. Nogawa, more

2011 Annual International Conference of the IEEE Engineering in Medicine and Biology Society > 3994 - 3997

2011 33rd Annual International Conference of the IEEE Engineering in Medicine and Biology Society

The concept of tailored bioinstrumentation using rapid prototyping and three-dimensional CAD (3D-CAD) was proposed. This concept is to make individually designed and fabricated sensor unit to attach human body. Within the proposed concept, cuff-units for continuous blood pressure measurement were individually designed using 3D-CAD and fabricated automatically. As the result, blood pressure wave forms...

chapter

Multivariate regression and discreminant calibration models for a novel optical non-invasive blood glucose measurement method named pulse glucometry

Y. Yamakoshi, M. Ogawa, T. Yamakoshi, T. Tamura, more

2009 Annual International Conference of the IEEE Engineering in Medicine and Biology Society > 126 - 129

2009 Annual International Conference of the IEEE Engineering in Medicine and Biology Society

A novel optical non-invasive in vivo blood glucose concentration (BGL) measurement technique, named ldquopulse glucometryrdquo, was combined with a kernel method; support vector machines. The total transmitted radiation intensity (I^lambda) and the cardiac-related pulsatile changes superimposed on I^lambda in human adult fingertips were measured over the wavelength range from 900 to 1700 nm using a...

chapter

Attempt of a novel calibration method of pulse oximetry using support vector machines regression

M. Ogawa, Y. Yamakoshi, M. Nogawa, T. Yamakoshi, more

2009 Annual International Conference of the IEEE Engineering in Medicine and Biology Society > 1485 - 1488

2009 Annual International Conference of the IEEE Engineering in Medicine and Biology Society

article

Substitution effect of Ba at the Sr sites in Sr(Fe,Re)O₃

T. Yamakoshi, K. Nomura, T. Kitamori, J. Shimoyama, more

Hyperfine Interactions > 2009 > 191 > 1-3 > 75-80

chapter

Oxygen consumption by vascular wall in skeletal muscle arterioles under physiological conditions

M. Shibata, T. Yamakoshi, K. Yamakoshi

2008 8th IEEE International Conference on BioInformatics and BioEngineering > 1 - 4

2008 8th IEEE International Conference on Bioinformatics and BioEngineering

To examine the large drop of partial oxygen pressure (PO₂) in arterioles, the O₂ consumption rates of arteriolar walls were determined under physiological conditions. A phosphorescence quenching technique was used to quantify the intra- and perivascular PO₂ values in rat cremaster arterioles. Using the measured PO₂ values, and a theoretical model, the O₂ consumption rates of the arteriolar walls were...

chapter

Feasibility study on driver's stress detection from differential skin temperature measurement

T. Yamakoshi, K. Yamakoshi, S. Tanaka, M. Nogawa, more

2008 30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society > 1076 - 1079

2008 30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society

Prolonged monotonous driving may lower a driver's awareness level as well as increasing their stress level due to the compulsion to maintain safe driving, which may result in an increased risk of a traffic accident. There is therefore an opportunity for technological assessment of driver physiological status to be applied in-car, hopefully reducing the incidence of potentially dangerous situations...

chapter

A New Non-invasive Method for Measuring Blood Glucose Using Instantaneous Differential Near Infrared Spectrophotometry

Y. Yamakoshi, M. Ogawa, T. Yamakoshi, M. Satoh, more

2007 29th Annual International Conference of the IEEE Engineering in Medicine and Biology Society > 2964 - 2967

29th Annual International Conference of the IEEE EMBS

We describe further development of a novel method for non-invasive measurement of blood glucose concentration (BGL), named Pulse Glucometry, based on differential near infrared spectrophotometry. Sequential temporal differences of infrared transmittance spectra from the radiation intensity (I^lambda) emerging from a fingertip containing an arterial pulse component (DeltaI^lambda) are analysed. To perform...

chapter

A Preliminary Study on Driver's Stress Index Using a New Method Based on Differential Skin Temperature Measurement

T. Yamakoshi, K. Yamakoshi, S. Tanaka, M. Nogawa, more

2007 29th Annual International Conference of the IEEE Engineering in Medicine and Biology Society > 722 - 725

29th Annual International Conference of the IEEE EMBS

Prolonged periods of driving in monotonous situations may lower a driver's activation state as well as increasing their stress level due to the compulsion to maintain safe driving, which may result in an increased risk of a traffic accident. There is therefore an opportunity for technological assessment of driver physiological status to be applied in-car, hopefully reducing the incidence of potentially...

chapter

Assessment of Slow-breathing Relaxation Technique in Acute Stressful Tasks Using a Multipurpose Non-invasive Beat-by-Beat Cardiovascular Monitoring System

M. Nogawa, T. Yamakoshi, A. Ikarashi, S. Tanaka

2007 29th Annual International Conference of the IEEE Engineering in Medicine and Biology Society > 5323 - 5325

29th Annual International Conference of the IEEE EMBS

Recently, several studies revealed that daily slow-breathing exercise lowered blood pressure and increased baroreflex sensitivity. With this interesting finding, we have been contemplating to design a compact breath-controllable device for relaxation to stress reaction during daily living for home as well as ambulatory use, as a final goal, towards reduction of cognitive hemodynamic disorders, hypertension,...

chapter

Support Vector Machines as Multivariate Calibration Model for Prediction of Blood Glucose Concentration Using a New Non-invasive Optical Method Named Pulse Glucometry

M. Ogawa, Y. Yamakoshi, M. Satoh, M. Nogawa, more

2007 29th Annual International Conference of the IEEE Engineering in Medicine and Biology Society > 4561 - 4563

29th Annual International Conference of the IEEE EMBS

A novel optical non-invasive in vivo blood glucose concentration (BGL) measurement technique, named "Pulse Glucometry", was combined with a kernel method; support vector machines. The total transmitted radiation intensity (I^lambda) and the cardiac-related pulsatile changes superimposed on I^lambda in human adult fingertips were measured over the wavelength range from 900 to 1700 nm using...

chapter

A New Method for Determining the Servo Reference Value (Vo) of the Volume-Compensation Method

S. Tanaka, M. Nogawa, Y. Sawanoi, T. Yamakoshi, more

2007 29th Annual International Conference of the IEEE Engineering in Medicine and Biology Society > 2354 - 2356

29th Annual International Conference of the IEEE EMBS

A new technique for swiftly determine a servo reference value (Vo) of the volume-compensation method was developed. To determine the Vo values, high frequency vibration (frequency: 20 Hz, pulse pressure: 10 mmHg) was superimposed on cuff pressure (Pc), and artificially produced arterial wall oscillation was detected as photoplethys-mographic (PG) pulsation signal. In this signal, maximum oscillation...

chapter

Energetics in arterioles during nitric oxide dependent and independent vasodilation

M. Shibata, T. Yamakoshi, K.-i. Yamakoshi

2007 29th Annual International Conference of the IEEE Engineering in Medicine and Biology Society > 1695 - 1698

29th Annual International Conference of the IEEE EMBS

The objective of this study was to evaluate whether the nitric oxide (NO) would decrease vessel wall oxygen consumption by decreasing the mechanical work of vascular smooth muscle. The oxygen consumption rate (QO₂) of arteriolar walls in rat cremaster muscle was determined in vivo during NO dependent and -independent vasodilation based on the intra- and perivascular oxygen tension (PO₂) measured by...

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Search results for: T. Yamakoshi

Substitution effect of Ba at the Sr sites in Sr(Fe,Re)O₃

An Improved Local Pressurization-Cuff Technique for Non-invasive Digital Arterial Pressure by the Volume-Compensation Method: Its Performance and Evaluation of Accuracy

Multivariate Calibration Models to Classify Blood Glucose Levels Non-invasively Based on A New Optical Technique Named Pulse Glucometry

A new calibration method with support vector machines for pulse oximetry

Levels of Salivary Chromogranin-A Secreted During Simulated Monotonous Driving Stress

An attempt of new calibration method with support vector machines regression for pulse oximetry

Development of a new aortoscope system for the use of endovascular intervention

Blaschkoid distribution of cylindromas in a germline CYLD mutation carrier

A new proposal of tailored bioinstrumentation using rapid prototyping and three-dimensional CAD — First trial to develop individually designed cuff-units for continuous blood pressure measurement

Multivariate regression and discreminant calibration models for a novel optical non-invasive blood glucose measurement method named pulse glucometry

Attempt of a novel calibration method of pulse oximetry using support vector machines regression

Substitution effect of Ba at the Sr sites in Sr(Fe,Re)O₃

Oxygen consumption by vascular wall in skeletal muscle arterioles under physiological conditions

Feasibility study on driver's stress detection from differential skin temperature measurement

A New Non-invasive Method for Measuring Blood Glucose Using Instantaneous Differential Near Infrared Spectrophotometry

A Preliminary Study on Driver's Stress Index Using a New Method Based on Differential Skin Temperature Measurement

Assessment of Slow-breathing Relaxation Technique in Acute Stressful Tasks Using a Multipurpose Non-invasive Beat-by-Beat Cardiovascular Monitoring System

Support Vector Machines as Multivariate Calibration Model for Prediction of Blood Glucose Concentration Using a New Non-invasive Optical Method Named Pulse Glucometry

A New Method for Determining the Servo Reference Value (Vo) of the Volume-Compensation Method

Energetics in arterioles during nitric oxide dependent and independent vasodilation

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