Japanese government has been interested in “Healthy life expectancy” since World Health Organization (WHO) declared in 2000. Japanese healthy life expectancy is increasing year by year although there is a gap between healthy life expectancy and the life expectancy. Japanese government (Japan sports agency and the department of health, labor and welfare) recommends seriously the sport and exercise to elderly people for the prevention of health frail. Because the frail elderly people have a high risk which lead to some health problem including mental health or death, and which use a lot of the medical expenses. The technology has not only a potential to contribute to make the frail elderly people get back to the health, but also a potential to improve the QOL of elderly people.
Rugby World Cup 2019 has held in Japan, and Tokyo Olympic and Paralympic will hold in 2020. It is no exaggeration to say that Japan has already become one of the biggest sport countries in the world. There is an important thing named “Welfare” for the athlete in such as the big sport countries. Welfare is covered all areas in terms of sport medicine where are from the compensation of insurance to the prevention of injury and disease. This paper shows two examples. One is about utilizing ICT in the sport medicine of elite sports. Another one is about the association between Paralympic athlete and medical engineering. Those are good practical examples for the athlete. This way of thinking and the concept in terms of “Welfare” might be spread out to not only elite level but also community level after the big sport event.
The key technologies for realizing human sensing using human samples such as blood and saliva are biomarkers and biosensors. Chemical salivary test has overwhelming advantages over blood test in that it is intrinsically safe and test samples can be self-collected any time. Especially, salivary sensors will be practically applied to various human sensing as point-of-care testing (POCT). This review focuses on the current status and future prospects of diagnostic methodologies using saliva samples. Although attaining happiness and overcome stress are nearly universal goal, surprisingly little research has focused on how happiness can be increased and stress can be decreased. The direction of new applications for salivary sensors is discussed by introducing commercially available salivary tests for the detection of emotion and stress.
In recent summers in Japan, the temperature and humidity are so high as to affect the criticality of body temperature regulation in the living body, so exercise under hot heat has a physiological adverse effect on the living body. And it is heat stroke that is caused by the influence on them and is causing trouble to people.
This time, the author is a physical education teacher who has no connection with this society. However, I actually practice Kendo every day with my students, and I am at risk of heat stroke. Based on various researches, I would like to report on the current state of biometric sensing of biometric information for people with heat stroke who are exercising in a hot environment, with expectations for future heatstroke measures.
This paper describes the outline of balneology and the hot spring effect for the human body. Hot springs (onsen in Japanese) are defined by certain criteria for the ingredients and hot water temperature. The thermal effect, one of the physical effects of hot springs, expand blood vessels to improve blood flow and recover fatigue. In addition, the chemical effect as mineral content of hot springs enhances the thermal effect. Japan has 21 health promotion facilities using hot springs which are approved by the national government, and the cost of using these facilities is recognized as medical expenses under the Japanese tax system. The development of measuring instruments and epidemiological surveys at hot springs are necessary for the development of balneology.
We're doing consistent production and sale of luxury disposable wooden chopsticks with cedar thinned wood as company's business, because the sleep introduction effect can be expected of the "sleep cedar pillow" developed as derivation items, I'd like to introduce the longitude and latitude of the development.
This paper presents design studies on a hybrid excitation motor (HEM) with a field winding on a rotor. This HEM has a reverse saliency, and in addition to using reluctance torque, it aims to reduce the cost of the inverter by improving the power factor and to eliminate the cost caused by the field winding power supply and slip ring. Using the IPMSM installed in the 3rd generation PRIUS as a comparison target, the efficiency in each operating region was compared by two-dimensional finite element analysis.
This paper reports a numerical study about vibration suppression of a rigid rod utilizing gyroscopic effect. Undesirable vibrations occur in vehicles such as automobiles and trains, which can be ideally simplified into an elastically supported rigid rod. The authors aimed to suppress the vibration of a rigid rod supported by superconductive magnetic levitation and suggested a gyroscopic damping as a method. Gyroscopic dampers are often utilized to suppress rotational motions, and rarely used in systems which vibrates in a translational motion. In this study, both ends of the rigid rod are supported by superconducting bulks whose positions are fixed, and the longitudinal axis of the rod is assumed to undergo a planar motion, therefore its motion can be described with 2 DOF. With the rotation of the gyroscopic damper, the system’s dynamical behavior can be regarded as 3 DOF, hence, in theory, the vibration of the rod can be suppressed. Optimal conditions are derived by fixed point theory, followed by a numerical calculation, and the results were successful.
Magnetic bearings (MBs) levitate and suspend rotors. MBs have some advantages such as low friction, no wear, and no risk of fluid pollution because they can suspend rotors without mechanical contacts and lubricants. To avoid increasing size of systems, triaxial active control magnetic bearings (triaxial AMBs) have been proposed. They consist of some radial and thrust MBs. We proposed the triaxial AMB without permanent magnets which has an asymmetric structure. It is specially designed for high-temperature turbomachines. However, the triaxial AMB has interference characteristics when it suspends a rotor in the radial and the thrust direction simultaneously. In order to solve this problem, we propose a position control system with nonlinear compensator that the compensation characteristics are changed by current and rotor displacement. The interference characteristics are investigated using a finite element method. Moreover, the dynamic performance is evaluated, and it is clarified that the proposed control system can suppress the interference.
Activity of experimental small animals has been measured as one of animal experiments in the fields of neurophysiology and behavioral psychology. Although an implantable activity meter is useful for this purpose, there are problems to record for a long time because it uses batteries and to stresses animals because of weight and dimensions. A wireless power transmission system, for this reason, is useful. The stable power supply to the activity meter is necessary to generate a uniform magnetic field in the animal cage. This paper describes the design and trial production of the power transmission coil that has the required magnetic field uniformity in the cage for small experimental animal and whose self-resonant frequency is sufficiently higher than the power transmission frequency.
An electromagnetic shunt damper is a type of a dynamic vibration absorber; however, the subsystem consists of an LCR series circuit instead of a supporting mass. When this is utilized to a superconductive levitation system, the optimal value of the resistance within the circuit is quite small. The value is difficult to be precise in practice, hence there are chances that the damper will be ineffective. However, there are possibilities that the restriction due to the optimal resistance value can be eased by using an LCR circuit where the resistance and the capacitance is parallel. In this study, the authors studied the vibration characteristics of a levitating magnet with an electromagnetic damper. The theoretical frequency responses of the amplitude were derived for both conditions: the system with a series circuit and a parallel circuit. Numerical calculations were also performed to confirm the effectiveness of the damper.
Ferrofluid is a magnetic functional fluid that flows in the direction of strong magnetic field. The authors tried non-contact levitation of a ferrofluid droplet in mid-air by controlling external magnetic field from a bar-shaped electromagnet. This paper describes the magnetic levitation system which consists of the electromagnet with a tapered tip, displacement sensor, and z-positioning stage with an oil-repellent film. This paper also reports on the procedure to establish non-contact levitation of the droplet. We evaluated the deformation and levitating behavior of the 15 mg droplet before and after the levitation start by using a high-speed camera. Finally, from the viewpoint of magnetic levitation technology, we experimentally derived the relationship between control current, mass of a droplet, and levitation gap.