| 摘要 |
The method consists, on the one hand, in covering the defined region with a radio-frequency field and in providing the said subject with a transmitter/receiver (transceiver) device (2, 2'), from which he or she cannot be separated, the said device being designed to receive the said field and/or to emit violation signals, the transmitter function being activated when the reception level of the said field exceeds a predetermined threshold and, on the other hand, in taking up the said violation signals. <IMAGE>
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