1. (1) A. Monden and C. Thomborson: “Recent Software Protection Techniques-Software-only Tamper Prevention-”, IPSJ magazine, Vol. 46, No. 4, pp. 431-437 (2005) (in Japanese)
2. (2) S. Ichikawa et al.: “Converting PLC instruction sequence into logic circuit: A preliminary study”, Proc. 2006 IEEE Intl. Symp. Industrial Electronics (ISIE '06), pp. 2930-2935 (2006)
3. (3) S. Ichikawa et al.: “An FPGA implementation of hard-wired sequence control system based on PLC software”, IEEJ Trans. Electrical and Electronic Engineering, Vol. 6, No. 4, pp. 367-375 (2011)
4. (4) N. Fujieda, S. Ichikawa, Y. Ishigaki, and T. Tanaka: “Evaluation of the hardwired sequence control system generated by high-level synthesis”, Proc. 26th IEEE Intl. Symp. Industrial Electronics (ISIE 2017), pp. 1261-1267 (2017)
5. (5) S. Yamada, S. Ichikawa, and N. Fujieda: “An Experimental Implementation of Obfuscated Control Logic Circuit with LegUp”, 23rd Intelligent Mechatronics Workshop (IMEC 2018), 2B4-2 (2018) (in Japanese)