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Unfortunately, in the original publication, the fourth author’s name (Vijayan Sugumara) and affiliation of all authors have been published incorrectly. The acknowledgment section was also missed. The correct name of the fourth author is Vijayan Sugumaran. The correct affiliation of all authors and the acknowledgment section are given below. Acknowledgments This research was supported by Next-Generation Information Computing Development Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning (2012M3C4A7033348).

Erratum to: Metrics for measuring the consistencies of requirements with objectives and constraints