wilamowski-b-m-irwin-j-d-industrial-communication-systems-2011

8-26 Industrial Communication Systems
Mon
Breakfast
1. Oscillococcinum
2. Paracetamol
Lunch
1. Paracetamol
Dinner
1. Oscillococcinum
2. Paracetamol
TUE
Breakfast
1. Oscillococcinum
2. Paracetamol
Lunch
1. Paracetamol
Dinner
1. Oscillococcinum
2. Paracetamol
WED
Breakfast
1. Oscillococcinum
2. Paracetamol
Name: Chan Tai Man
HKID: Z123456(1)
Date: 15/6/2009
Time: 15:28:34
FIGURE 8.18
Illustration of the RFID-medicine dispensary tape.
therefore the RFID versions of Cisco and Yahoo are desperately needed. In fact, technology alone cannot
make the Internet great. The joint force of novel technologies and time-honored ones has facilitated a
platform on the one hand, and on the other, the collective wisdom of innovative semitechnical applications
and ingenious nontechnical usages has contributed equally, if not more, in building the almighty
global system. In other words, an RFID styled e-Bay, Facebook, and MySpace are also needed.
8.33 Nonionization Radiation
In the evolution of the AIDC from Hollerith’s punch card to the UHF RFID, a new scheme was invented
because the existing one might have lost its competitiveness due to the emergence of a challenging new
technique. Sometimes, a system might have reached its capacity or capability, yet further expansion was
ruled out for spectral reasons and other physical constraints. From time to time, the deployment of a
new system was objected to by various activist groups on grounds of environmental protection, potential
cultural conflicts, and other socioeconomic issues, such as loss of privacy.
Today, however, one of the issues of great concern is nonionizing electromagnetic radiation. So far,
there is no solid scientific evidence proving that illumination of the electromagnetic field is hazardous
to our health. However, there is no proof showing that it is harmless. On this life and death issue, we
must be very cautious.
Unlike burning or poisoning, there exists no proven case indicating that prolonged exposure to a
strong electromagnetic field is fatal. Statistical analyses with questionable inductions and inconclusive
remarks are available. Hence, it is very difficult to determine the critical field strength and the threshold
duration. Based on disputable studies, admissible limits on field strengths have been promulgated
by many national authorities. Nonetheless, it is better to be conservative than aggressive on this issue,
especially when the aggregated field intensity due to a large number of interrogators is difficult to estimate
in advance.
For convenience, an RFID reader is usually hidden beneath the counter with its antenna pointing
upward, so that the head of a tag carrier is subject to a strong nonionization radiation. Moreover, the
900.MHz electromagnetic field and its harmonics will interfere with the operations of many wireless
communications systems, especially cellular phones working at 900 and 1800.MHz. What is more, as a
proactive device, an RFID interrogator is turned on all the time even when no tag is found within its turf
for a long time. For a person working inside the same office, it is an absolutely unnecessary exposure,
© 2011 by Taylor and Francis Group, LLC