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JUCS - Journal of Universal Computer Science 18(20): 2832-2850
doi:
10.3217/jucs-018-20-2832
Received:
22 Aug 2011 | Approved:
20 Jul 2012 | Published:
01 Dec 2012
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Authors
Daewon Kim 
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Dankook University, Cheonan,
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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.