Zheng, Jing
Fu, Xiao
Zhang, Guijun
Article History
Received: 23 May 2016
Accepted: 26 April 2017
First Online: 9 May 2017
Compliance with ethical standards
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: The authors declared that they have no conflicts of interest to this work. We declare that we do not have any commercial or associative interest that represents a conflict of interest in connection with the work submitted. This work was supported in part by the Scientific Research Starting Foundation of Hangzhou Dianzi University (No. KYS395617020). The author Fu X. also works in the Research Center of Information Technology & Economic and Social Development.