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C. Reasoning Module response
The response from the RM provides the following information about the reported
event (see Fig. 9):
• classes that an individual belongs to ( and ),
• threats which are results of reported event (),
• public safety services, which should be informed about the reported accident
(.
VI. Results of testing the Reasoning Module
It is well-known that reasoning on an ontology is time consuming. Long execution
time for programs based on ontologies result from the time necessary for
classification of the concepts in the ontology, checking the consistency of ontology,
inferring knowledge and executing SWRL rules.
In order to check efficiency of the RM and possibility to apply it for a number
of users in the INSIGMA project there have been carried out performance tests
in SOAP UI. We analyzed how a number of SOAP requests affect the reasoning
module response time. The results of test are depicted in the table below. It is visible
that the invocation time depends on a number of subsequent requests.
Table I
Number of requests Min time [s] Max time [s] Avg time [s]
1 7,4 10,4 8,3
2 9,1 11,2 10,6
5 17,2 37,6 24,7
10 20,7 52,8 37,1
20 22 69,1 39,5
hardware: Intel(R)Core(TM)i7 CPU 2.67 GHz; 8 GB RAM; Windows 7 64-bit;
Java version 1.7.1_01
Average time for one request is above 8 s, but when we invoked service ten
times at the same time, the response time increased to 39,5 s. Results of the analysis
indicate that if we want to use run-time ontology in a large system like INSIGMA
with many end-users, we have to use correspondingly high computational power
systems or develop reasoning modules on the basis of more efficient reasoning
frameworks.
VII. Future work
We are planning to apply the proof of concept of ENS as test deployment
in the city of Legionowo. The remarks from users of the report and server modules