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JUCS - Journal of Universal Computer Science 21(3): 440-453
doi:
10.3217/jucs-021-03-0440
Received:
30 Jun 2014 | Approved:
28 Feb 2015 | Published:
01 Mar 2015
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Authors
Qi Xia 
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University of Electronic Science and Technology of China, Chengdu, China
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University of Electronic Science and Technology of China, Chengdu, China
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University for Development Studies, Tamale, Ghana
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University of Pennsylvania, Philadelphia, United States of America
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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.