New applications in the area of mobile computing make heavy use of knowledge about the application’s run-time environment. Applications running on mobile devices in particular exploit knowledge about their current geographical position or query for the location of other interesting objects. To manage such queries some applications provide a location service specifically tailored for their needs...

This paper addresses the problem of DoS (Denial of Service) attacks. The technique proposed in this makes DoS attacks difficult by providing the location of a service only to the pre-registered users and hiding it from all others. In addition, a static service is converted to a relocating service and it relocates whenever attacked. The Domain Name Service (DNS) protocol is modified to provide t...

The emergency service facilities location is one of the most important issues in the emergency management. This study focused on the location set covering problem (LSCP) for emergency service facilities under fuzzy environment. On the basis of defining the signed distance of trapezoidal fuzzy number, the ranking rules of trapezoidal fuzzy number are defined, the model of emergency service facil...