This special issue comprises of six selected papers from the third International Symposium on Intelligent Information Technology and Security Informatics (IITSI 2010), Jinggangshan, China, 2-4 April 2010. The conference received 630 paper submissions from 17 countries and regions, of which 358 papers were selected for presentation after a rigorous review process. From these 358 research papers, through two rounds of reviewing, the guest editors selected six as the best papers on the Software track of the Conference. The candidates of the Special Issue are all the authors, whose papers have been accepted and presented at the IITSI 2010, with the contents not been published elsewhere before.
  The 2010 Symposium on Intelligent Information Technology and Informatics Security is co-sponsored by Jinggangshan University, China;Peoples'Friendship University of Russia;Feng Chia University, Taiwan; Nanchang HangKong University, China; East China Jiaotong University, China;Jiaxing University, China; Qingdao University of Science & Technology, China; Academy Publisher, Finland; Hunan Agricultural University, China. Technical Co-Sponsors of the conference are IEEE; IEEE Shanghai Section.
  “On a Generalization of Cubic Spline Interpolation”, by Shang Gao, Zaiyue Zhang and Cungen Cao, based on analysis of basic cubic spline interpolation, the clamped cubic spline interpolation is generalized in this paper. The methods are presented on the condition that the first derivative and second derivative of arbitrary node are given.
  “Research on Component Composition and Replacement with Formal Semantics”, by Ruzhi Xu, Quansheng Wu and Peiguang Lin, based on the notion of ‘design by contract’, components interaction patterns and process patterns of component composition, formal semantics of components are proposed.
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