However, the alarm device installed in order to send a message to the alarm the alarm continually over the past. Still can't cover the vulnerable areas in the country, all Thai. As can be seen from Figure 1 to figure 5 who demonstrate coverage in an alarm from the national disaster warning center to the people who live in vulnerable areas across the country, Thai. It is seen that the coverage of such disaster alerts. It is still a relatively low level compared to the number of vulnerable areas of the country's entire Thai. In particular, areas in the Central and North East. In addition, users in vulnerable areas, alarm devices, all over the country have been send to alarm device added continuously. From these reasons, in the initial The national disaster warning center, it is necessary to perform additional alarm equipment is installed in an area that risks have not yet been installed, alarm devices, including the development of integrated disaster warning system existed, effectively adding more. Fit and causing high interest in system usage
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