Sosuke Tsukamoto

Two-dimensional Location and Direction Estimating Method

In this paper, a method of estimating both the position and the rotation angle of an object on a measurement stage was proposed. The system utilizes the radio communication technology and the directivity of an antenna. As a prototype system, a measurement stage (a circle 240mm in diameter) with 36 antennas that placed in each 10 degrees was developed. Two transmitter antennas are settled in a right angle on the stage as the target object, and the position and the rotation angle is estimated by measuring efficiency of the radio communication of each 36 antennas. The experimental result revealed that even when the estimated location is not so accurate (about a 30 mm error), the rotation angle is accurately estimated (about 2.33 degree error on average). The result suggests that the proposed method will be useful for estimating the location and the direction of an object.

Proposal of Wireless Behavioral Monitoring System with Electric Field Sensor

This paper describes a wireless behavioral monitoring system equipped with an omnidirectional electric field sensor. The system can be installed by individuals in their residences. It is composed of a sensor circuit, wireless data transmitter, and receiver that is connected to a personal computer for data storage. The sensor circuit has been designed to obtain information on the usage of domestic appliances by measuring the electric field around them. It is assumed that the usage statistics provide information on a type of indoor behavior of the subject. Since the system employs a device that transmits the obtained data through weak radio waves, the sensor unit, which is composed of the sensor circuit and wireless data transmitter, can be used by simply attaching it to an appliance. Simple evaluation tests confirm the practicability of the system

A handle electrode system for measuring heart rate while riding a bicycle

In this paper, a handle-electrode system is proposed for obtaining the heart rate of a user while riding a bicycle. The system was designed to measure the users heart rate by only gripping the handle of a bicycle. Three electrodes made from conductive cloth were adhered to the handle. A method detecting heart-rate from the obtained electrocardiogram was also proposed. To assess the applicability of the proposed system, a simple experiment was performed. The experiment was performed in four conditions of road surfaces; lawn, asphalt, a tiled, and an uneven road. Experimental result suggests that the proposed system can be useful for obtaining R waves while riding a bicycle.

Handle Electrode System for Selecting Load Level of Treadmill

In this paper, a handle-electrode system is proposed for obtaining heart-rate of the user during exercising of a treadmill. The system was designed to be measurable the users heart-rate by only gripping the parallel bar. Three electrodes that made from conductive cloth were adhered to the handle. A method detecting heart-rate from obtained electrocardiogram was also proposed. To assess the applicability of the proposed system, a simple experiment was performed. Eight healthy volunteer (aged 25 plusmn 5 years) participated in this experiment. As the result, the heart rates of 7 out of 8 subjects were successfully obtained.

Recreation activity monitoring system using proximity sensors

This paper describes a recreational-activity monitoring system that records the existence of tools (removed or not from a predefined place) that are used in the recreation activities. The system is composed of three types (infrared, ultrasonic, and RFID) of proximity sensors to adapt to various sizes of the target object. The timings of when the target object was removed and returned are monitored. Simple experiments showed that the detectable range of the system was approximately 60~100 mm, and concluded that the infrared and ultrasonic sensors were useful for relatively large objects, and the RFID technology was suitable for small objects.

Two-dimensional location and direction estimating method

In this paper, a method of estimating both the position and the rotation angle of an object on a measurement stage was proposed. The system utilizes the radio communication technology and the directivity of an antenna. As the preliminary study, an experimental system that employs RFID technology was developed. Two RFID tags are used for estimating the location of one target object. The experimental result revealed that even when the estimated location is not so accurate (about a 10-20 mm error), the rotation angle is accurately estimated (about 4.42 degree error on average). The result suggests that the proposed method will be useful for estimating the location and the direction of an object.