1. COMSOL Multiphysics® v. 5.5. www.comsol.com. COMSOL AB, Stockholm, Sweden.
2. Gotoh, Y. and Saito, K., Design and manufacture of the core panel by origami engineering, Journal of the Society of Mechanical Engineers, Vol.119, No.1175(2016), pp.576-577, DOI:10.1299/jsmemag.119.1175_576 (in Japanese).
3. Hagiwara, I., Stamping and welding two steel plates cheaper than honeycomb- panels, Automotive Technology, No. 1 (2011), pp.96-101 (in Japanese).
4. Ichinomiya, R., Easy-to-understand noise reduction technology-From noise basics to countermeasures (2011), pp.179-200, Morikita Publishing (in Japanese).
5. Ishida, S., Morimura, H., Gotoh, Y. and Hagiwara, I., New transmission loss calculation method using finite element method, Transactions of the JSME (in Japanese), Vol. 80, No. 813 (2014), DOI:10.1299/transjsme.2014dr0127.