Tatsuo Togawa - Academia.edu (original) (raw)

Papers by Tatsuo Togawa

Keisoku Jidō Seigyo Gakkai ronbunshū, 1983

Transactions of Japan Society of Kansei Engineering, 2009

In order to consider facial expressions of laughter in relation to underlying mental processes, w... more In order to consider facial expressions of laughter in relation to underlying mental processes, we have been attempting to use remake movies. In this study, we introduced automatic smile-detection software so as to evaluate the strength of laughter objectively. First, the performance of the automatic smile-detection software was examined by a questionnaire-style survey in 10 subjects aged between 19 and 25. Second, from 23 original-remake movie pairs, we extracted 37 facial expressions of laughter for analysis. Measured strengths of facial expressions of laughter of corresponding scenes of original and remade were close to each other except few exceptions. This result suggests that the smile-detection software is reasonably accurate, and facial expressions of laughter at the same underlying context are always similar even though backgrounds of movie production are different.

IEEE Transactions on Biomedical Engineering, 1980

The pninciple of this method is based on the evidence that the elecical admittance variation in a... more The pninciple of this method is based on the evidence that the elecical admittance variation in a finger segment inmersed in an electrolyte olun disappeas when the restivity of the solution is equal to that of the blood flowing into the segment. Thus, the blood resisfivity and, therefore, the hematocrit can be noninvasively determined from the electrolyte resistivity. The hematocrit values determined by this method (Hcty) were compared with those by the capillary method (Hctc) in 16 subjects: the linear regression equation was Hcty = 1.02Hctc-0.35 with a correlation coefficient r = 0.981. THEORY OF THE NONINVASIVE MEASUREMENT OF BLOOD RESISTIVITY In Fig. 1 the schematic representation [see Fig. 1(a)] and its two-dimensional model diagram [see Fig. 1(b)] for the noninvasive measurement of blood resistivity in a finger is shown. This is a slight modification from Swanson and Webster [6]. When the finger is submerged in an electrolyte solution filled in a rigid chamber, the total electrical admittance (Y; S) of the column which is composed of the finger and the electrolyte solution is expressed as Y = V/(pL2)

The Japanese journal of medical instrumentation, Jul 1, 1990

Proceedings of 18th Annual International Conference of the IEEE Engineering in Medicine and Biology Society

ABSTRACT

Proceedings of the 22nd Annual International Conference of the IEEE Engineering in Medicine and Biology Society (Cat. No.00CH37143)

An imaging system has been developed to visualize the effect of reactive hyperemia by measuring s... more An imaging system has been developed to visualize the effect of reactive hyperemia by measuring skin thermal inertia after releasing arterial occlusion because it was known that thermal inertia depends on the blood flow. The method is based on the ability to calculate thermal inertia from thermographic measurements of the response to a known stepwise change in ambient radiation temperature.

Telemedicine journal : the official journal of the American Telemedicine Association, 1998

A fully automated, noninvasive data-acquisition system was developed to permit long-term measurem... more A fully automated, noninvasive data-acquisition system was developed to permit long-term measurement of physiological functions at home, without disturbing subjects' normal routines. The system consists of unconstrained monitors built into furnishings and structures in a home environment. An electrocardiographic (ECG) monitor in the bathtub measures heart function during bathing, a temperature monitor in the bed measures body temperature, and a weight monitor built into the toilet serves as a scale to record weight. All three monitors are connected to one computer and function with data-acquisition programs and a data format rule. The unconstrained physiological parameter monitors and fully automated measurement procedures collect data noninvasively without the subject's awareness. The system was tested for 1 week by a healthy male subject, aged 28, in laboratory-based facilities.

2001 Conference Proceedings of the 23rd Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 2001

The pO/sub 2/-dependent regulation of microvascular blood flow was evaluated in rabbit skeletal m... more The pO/sub 2/-dependent regulation of microvascular blood flow was evaluated in rabbit skeletal muscle in vivo. The tenuissimus muscle was prepared to observe the microcirculation. The mean red blood cell velocity and perfused capillary density at various tissue pO/sub 2/ levels were measured using an intravital video-microscope. Both velocity and density were significantly decreased as tissue pO/sub 2/ was elevated, but the relationship between capillary flow and tissue pO/sub 2/ was not a linear correlation. In addition, the critical pO/sub 2/ value effected on microvascular blood flow regulation may exist in the tissue pO/sub 2/ ranging from 30 to 50 mmHg, which might be detected in the region of arteriolar walls.

IEICE technical report. ME and bio cybernetics, 1993

Journal of Applied Physiology, 1976

A plethysmograph for measuring ventricular stroke volume (SV) from the transthoracic admittance v... more A plethysmograph for measuring ventricular stroke volume (SV) from the transthoracic admittance variation was developed. A correlation study between the SV values determined by this method (SVy) and those measured by Kubicek's transthoracic impedance method (SVz) was carried out on 24 healthy subjects; the correlation coefficient was r = 0.99 and the regression line of SVY on SVz was y = 1.03x - 0.47. Based on the results obtained through the study, it was concluded that the admittance method was more advantageous than the impedance method for measuring SV.

American Journal of Physiology-Heart and Circulatory Physiology, 1980

To study the adaptive response of the vascular wall to blood flow changes, an arteriovenous shunt... more To study the adaptive response of the vascular wall to blood flow changes, an arteriovenous shunt was constructed between the common carotid artery and the external jugular vein in 12 dogs. Six to eight months postoperatively, the arterial internal radius (r) was determined by angiography and/or the use of pressure-volume relationship. The results showed that r increased with increased flow load (f) and vice versa. Wall shear rate (gamma) was calculated from gamma = 4f/(tau r3), assuming laminar flow. The value of gamma, initially proportional to f, had recovered almost to the control level (within 15%) due to the vessel dilatation or atrophy during the chronic experiment, when f was less than 4 times the control. Transendothelial protein permeability, evaluated at the T-1824-stained surface by a reflectometric method, also showed a close correlation with wall shear (r = 0.934). A local autoregulatory mechanism of wall shear stress involving protein turnover in the vascular wall is ...

Images of the Twenty-First Century. Proceedings of the Annual International Engineering in Medicine and Biology Society

... Institute for Medical and Dental Engineering Tokyo Medical and Dental University 2-3-1 0 Kand... more ... Institute for Medical and Dental Engineering Tokyo Medical and Dental University 2-3-1 0 Kanda Surugadai, Chiyoda-ku, Tokyo 101, Japan and Masayuki Ishi j ima ... 131 SCKwatra and VKJain,&amp;quot;A new technique for monitoring heart signals - Part I and Part 11&amp;quot;, IBEE Trans. ...

Proceedings of 17th International Conference of the Engineering in Medicine and Biology Society

The purpose of this study was to estimate skin thermal inertia by successive thermographic measur... more The purpose of this study was to estimate skin thermal inertia by successive thermographic measurements of the skin surface at a stepwise change in ambient radiation temperature. Two hoods maintained at different temperatures were mechanically switched to provide the stepwise change. A total of 65 thermograms were taken from 2 seconds before to 32 seconds after the hood switching. The skin thermal inertia was derived by applying a statistical curve fitting to successively measured thermograms, and images of skin emissivity and emissivity-corrected skin temperature could be obtained in a single measurement. Measurements were performed on the forehead, cheek, forearm, palm and back of the hand of 10 healthy male subjects, and the skin thermal inertia was scattered through a range of 1400/spl sim/2100 [Ws/sup 1/2/m/sup -2/K/sup -1/].

Abstract The aim of this study was to examine the quantitative relationship between physical acti... more Abstract The aim of this study was to examine the quantitative relationship between physical activity and heart rate in dementia patients. Acceleration at the waist, wrist and ankle and ECGs were measured by an ambulatory monitor. At the same time as these ...

Medical Progress through Technology, 1987

The sintered hydroxyapatite was designed to be utilized as a percutaneous device. The device was ... more The sintered hydroxyapatite was designed to be utilized as a percutaneous device. The device was percutaneously fixed through the back skin of mongrel dogs. The tissue reaction around the implants was examined histologically. At 1 month the sintered hydroxyapatite was closely contacted with the skin tissue and downgrowth of epidermis was not observed. The long-term implantation ranging from 3 to 17 months showed that the depth of epidermis downgrowth was limited to only 1 mm. The amino acid composition of fibrous capsule formed around the hydroxyapatite showed close resemblance to vertebrate periosteum. It was confirmed that the sintered hydroxyapatite had good compatibility and long-term stability with skin tissue.

Taken as a whole, this series covers all major fields of application for commercial sensors, as w... more Taken as a whole, this series covers all major fields of application for commercial sensors, as well as their manufacturing techniques and major types. As such the series does not treat bulk sensors, but rather places strong emphasis on microsensors, microsystems and integrated electronic sensor packages. Each of the individual volumes is tailored to the needs and queries of readers from the relevant branch of industry. A review of applications for point-of-care diagnostics, their integration into portable systems and the comfortable, easy-to-use sensors that allow patients to monitor themselves at home. The book covers such advanced topics as minimal invasive surgery, implantable sensors and prostheses, as well as biocompatible sensing.

Proceedings of the 20th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. Vol.20 Biomedical Engineering Towards the Year 2000 and Beyond (Cat. No.98CH36286)

The automated health monitoring system for daily physiological status during bathing, excretion a... more The automated health monitoring system for daily physiological status during bathing, excretion and sleep used at a pilot house called “Welfare Techno House (WTH)” was designed. The WTH is an advanced and experimental house to evaluate systems for welfare and home health care. We tried three automated measurements of (1) electrocardiogram (ECG) in bath tub, (2) body and excreta weight

Proceedings of the 10th IEEE International Conference on Information Technology and Applications in Biomedicine, 2010

Biphasic property in female body temperature during menstrual cycle is estimated by a discrete Hi... more Biphasic property in female body temperature during menstrual cycle is estimated by a discrete Hidden Markov Model (HMM)-based approach. Estimation procedure includes three steps - preprocessing, HMM-based main processing and postprocessing. The HMM is supposed to have two hidden phases to describe the biphasic property in body temperature during a menstrual cycle. Three kinds of different body temperature data were collected daily from four female volunteers over six months. Skin and core body temperatures were measured at intervals of ten and four minutes respectively and automatically by two separated wearable devices during sleep. Oral basal body temperature was measured in the morning right after wakeup. Estimation results of biphasic property from different body temperatures were evaluated by quantifying the alignment between estimated phase transitions and volunteers' menstruation records. Results showed that the estimation performance, in terms of sensitivity and positive predictability, varies with different kind of body temperature. Among 21 menstrual cycles in four participants during six months, both overall sensitivity and positive predictability of estimation by oral basal body temperature reach the highest 95.2%; those of skin body temperature have the lowest 81.0% and 77.3%, respectively; while those of core body temperature are 90.5% and 82.6%, respectively, straddling between oral and skin body temperatures.