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JUCS - Journal of Universal Computer Science 21(1): 110-133
doi:
10.3217/jucs-021-01-0110
Received:
16 May 2014 | Approved:
01 Oct 2014 | Published:
01 Jan 2015
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Authors
Yeonjeong Park 
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Ewha Womans University, Seoul,
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Conflict of interest
The authors have declared that no competing interests exist.
This article is freely available under the J.UCS Open Content License.