Shimon Ajisaka

Basic analysis of the circuit model using relay antenna in magnetic resonance coupling position sensing system

In this paper, a novel position sensing method using relay antenna in “magnetic resonance coupling position sensing system” is proposed. Basic system is based on a novel position sensing of the target using arrayed power transmitters. In such case, the positional accuracy is significant factors to determine the capability of the system. Using “relay sensing method” it is expected that the position accuracy and a degree of freedom will be improved. The contributions of this paper are follows. Details of the basic part of the proposed method are introduced with the equivalent circuit model and the equations which form the foundation of this novel system. Experimental and simulation results are shown to validate the proposed model and theory. Applying the “relay sensing method”, it is possible to be the basic technology to realize the “highly efficient power transmission system based on position sensing and navigation for electric mobile vehicles in the space”

Human balance control ability for affinitive personal vehicle

Recently personal vehicles have received a lot of attention to expand our mobility for low carbon society and diversification of individual mobility. So far several small vehicles have been developed. However a new thesis of designing and controlling personal vehicles is required, because there are some difference between general vehicle-used environment and personal vehicle-used environment like mixed traffic. In such new kinds of environment, vehicles should have close relationship with drivers. To have closer relationship, personal vehicles must be smaller and lighter. In addition, psychological and biological status should be considered to control vehicles, but there is few method to measure and estimate such status. The authors define such personal vehicles as Affinitive Personal Vehicle and try to estimate balance control ability of driver. In this study, the authors focus on vehicles posture and body sway of a driver to observe drivers status and get some knowledge on balance control ability.

Electric-field resonance coupling between human and transmitter for human position estimation system

In this paper, a novel human position estimation system using electric-field resonance coupling is proposed. There are various advantages of using electric-field for human position estimation system. The system is robust to illumination change, body-worn tags are not required and sensors could be hidden since electric-field can path through an insulator. Tags are not required because the system estimates the position by measuring the electric field transmitted along the human body which acts as an electric-field coupler. Moreover, the proposed system has wider sensing range and higher expandability to position estimation of multiple humans compared to the current system. Unlike the current system which only measures the electric-field coupled between human and transmitter, the proposed system measures the electric-field amplified by the resonance occurring inside the human (equivalent to giant antenna) to achieve wider sensing range. Meanwhile, the proposed system is also designed carefully to maintain the expandability to multiple humans position estimation. Based on the simulation results, it is verified that the sensing range could be up to 50[cm] with less than 5[cm] error. In the future, the proposed system could be a powerful alternative for the current system.

Human body position estimation system using electric field resonance coupling

Today in terms of security and caring, more various and robust information system about human existence in indoor environment (ex. rooms, buildings) are needed. Especially, human position estimation system in such kinds of spaces is basic. Generally, such kind of systems use radiowave devices, cameras and ultrasonic devices to estimate human position. But these kind of systems have some weakpoint when the system tries to estimate position. A purpose of this paper is to propose novel human position estimating system using electric field resonance coupling and validate the evidence for possibility of human position sensing system using resonance coupling by simulation experiment. In simulation experiment results using Gabriels human phantom, relation between electric field strength and distance between sensor and human are confirmed. In conclusion, feasibility of the proposed human position estimation system is shown.

Physiological estimation of body balance for Affinitive Personal Vehicle

Recently, personal vehicles have received a lot of attention to expand our mobility for low carbon society and diversification of individual mobility. So far several small vehicles have been developed. However a new thesis of designing and controlling personal vehicles is required, because there are some difference between general vehicle-used environment and personal vehicle-used environment like mixed traffic. In such new kinds of environment, vehicles should have close relationship with drivers. To have closer relationship, personal vehicles must be smaller and lighter. In addition, designing personal vehicles motion by considering drivers psychological evaluation, we can provide more comfortable vehicles interface. The author defined these kinds of personal vehicle as Affinitive Personal Vehicle and focused on drivers sense of balance to estimate drivers psychological evaluation. In this paper, author shows that change of vehicles motion effects on drivers sense of balance, and there is relation between drivers sense of balance and Kaisei evaluation.