Acknowledgement
This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Korean Government (Ministry of Science, ICT, and Future Planning) (NRF-2017M2B2B1072889), partially supported by the Materials/Parts Technology Development Program (20010585, High purity metal refining technology for titanium metal with zero toxic gas emission) funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea) and also Korea Institute for Advancement of Technology (KIAT) grant funded by the Korea Government (MOTIE) (P0002019, The Competency Development Program for Industry Specialist).
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