1. Ministry of Land, Infrastructure, Transport and Tourism, Roads Bureau, National Roads and Engineering Division (2019) Road Tunnel Periodic Inspection Procedure, March 2019
2. Kimura U, Krau A, Sakurai T (2018) Automatic crack detection in infrastructure inspection using fully convolutional network. IPSJ Trans Math Model Appl 11(1):12–20 (Japanese)
3. Chiyonobu M, Iida S, Ishikawa Y, Nishikino M, Kawakami R, Joe K (in press) Estimating concrete interior using a 3D-CNN. Advances in Parallel and Distributed Processing, and Applications
4. Feng MQ, De Flaviis F, Kim YJ (2002) Use of microwaves for damage detection of fiber reinforced polymer-wrapped concrete structures. J Eng Mech, 128(2)
5. Akkaya Y, Voigt T, Subramaniam KV (2003) Nondestructive measurement of concrete strength gain by an ultrasonic wave reflection method. Mater Struct 36:507–14