Abstract
A Communication between aged and child is effective to prevent an appearance and a progress of senile dementia. However, it is not effective if the child grow up under poor condition. Nowadays, connection between parents and child is not enough, since many parents are working together for living. So, most of parents do not know a location of their child. A new convenient method to monitor child behavior is developed. Parents are able to know the location of the child using the method. Crimes about the children are going to decrease, since the children are watched by the parents using the method. Personal Handyphone System(PHS)can be applied as an information-network to monitor the location. However, it is important to miniaturize a marker to be utilized for children. It is effective that a reduction of output power of the marker and a time control of oscillation. In this paper, a case of 1mW is simulated and analyzed. If the relay station detect a signal from a marker, the child can be watched. In the result, signal can be detected at zoo and residential area. The location of the child is displayed by the system. The child enjoy oneself or with friends under the monitor with love of one's parents.
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