| 摘要 |
<p>the present invention provides a method of detecting that a shipping container has been tampered with by unlawful opening of its doors, and a method of ensuring that patrolmen on duty are both safe and are patrolling their appointed route. Tags which are activated to transmit a signal as a result of an activating unit being brought into proximity thereto, or separated therefrom, are used. In protecting a shipping container the tag forms part of a detector structure which stores and transmits data which data changes when the container doors are opened and closed. In protecting premises, the patrolman activates each tag as he passes it to cause signals to be transmitted back to a control room. This indicates that the patrolman is moving from tag to tag in accordance with his schedule.</p> |
