Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Helping Blind People in Their Meeting Locations to Find Each Other Using
  RFID Technology   This paper presents a new specific system based on RFID technology to help
blind people find the other party in their meeting place. This system, uses a
device called Smart Director or SD, equipped with Active Tag and RFID Reader.
The blind person, the visitor, adjusts the SD with the identification number of
the other party who has shared it previously for example on a telephone call,
and takes the device to the meeting place. When the blind person arrives at the
location, the reader of the device receives signals from the active tag of the
other party's SD. It then identifies his/her position based on the intensity
and direction of the received signals and tell it to the blind person. In this
way, blind people can simply identify the position of the other party in
crowded places and find each other.

32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
23
The categories of this paper are: solv-int
13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn
16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg
27
The categories of this paper are: comp-gas
6
The categories of this paper are: astro-ph
17
The categories of this paper are: q-fin