1. 1) T. Kamada, M. Asano, M. Kunieda and K. Rokugo, ”Application of hammering method to quantitative non-destructive inspection of a surface defect of a concrete structure”, Journal of Japan Society of Civil Engineering, Vol.2002, No.704, pp.65-79 (2002).
2. 2) Y. Sonoda, K. Kawabata, M.Beppu and Y. Fukui, ”A fundamental study on the evaluation method of inner defect of concrete using hammering test data”, Journal of Structural Engineering, Vol.57, Part A, pp.802-811 (2011).
3. 3) S. Lee, T. Kamada, S. Uchida and D. Linzel, ”Imaging defects in concrete structures using accumulated SIBIE”, Construction and Building Materials, Vol.67, Part B, pp.180-185 (2014).
4. 4) A. Nouchi, Y. Murakami, T. Iyama and S. Toyama, ”Evaluation of defective areas inside concrete structures through application of frequency response function data to Self-Organizing Map”, Concrete Research and Technology, Vol.29, No.29, pp.87-100 (2018).
5. 5) M.P. Bendsøe and O. Sigmund, ”Topology Optimization Theory, Methods and Applications”, Springer, (2003).