1. Center for 3D Printing Nondestructive Testing, Korea Advanced Institute of Science and Technology, Daejeon 34141, South Korea
2. School of Mechanical Engineering, Hanyang University, Seoul 04763, South Korea
3. Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, South Korea
4. Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, South Korea