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Fig. 8.14
Average precision
result, obtained by the
centralized system with and
without the application of
occurrence weighting,
compared to P2P retrieval.
All these methods used
manual RF
An improvement of 38.5 % can be attained at
n
=
0, and 20.5 % at
n
=
1. The two
plots converge to the same precision rate at
n
5.
Screen shots of a query for an airplane, from the centralized database, with the
first and fifth iteration of manual RF, and with pseudo-RF on the distributed P2P
retrieval system, are shown in Fig.
8.16
a-d, respectively.
=
Fig. 8.15
Average precision
rate, obtained by
user-controlled RF and
semi-automatic RF, at the
same number of manual RF,
n
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