Title :
Security communication in winding tunnels and deep underground streets
Author :
Matsui, Kunio ; Chiba, Jiro
Author_Institution :
Graduate Sch. of Eng., Tohoku Univ., Sendai, Japan
Abstract :
In underground environments, communicability is vital in emergency cases such as fires, as well as in routine management operations. In a disaster the lines of the wire communication system may be damaged. Therefore, a simple wireless device is necessary for the preservation of public safety. This study aims at establishing a basis for solving such problems. In this paper, we have analyzed the propagation characteristics of the Crank-Tunnel. To solve such a boundary value problem, we have introduced the boundary-element method and the surface impedance approximation. In addition, reflector placed at the corner improves the radio communication characteristics in crooked tunnels
Keywords :
alarm systems; fires; safety; security; Crank-Tunnel; boundary value problem; boundary-element method; crooked tunnels; deep underground streets; fires; propagation characteristics; public safety; radio communication characteristics; routine management operations; security communication; surface impedance approximation; winding tunnels; Fires; Public safety; Public safety communication;
Conference_Titel :
Security Technology, 1994. Proceedings. Institute of Electrical and Electronics Engineers 28th Annual 1994 International Carnahan Conference on
Conference_Location :
Albuquerque, NM
Print_ISBN :
0-7803-1479-4
DOI :
10.1109/CCST.1994.363766
