In Soo Lee; Won-Sub Tae; Yoon-Soo Kim; Myung-hwan Jeong; Jong-Pil Seo; Kyung-Jin Na; Dong-Jin Sung; Soo-Young Ha . State Monitoring System of Robot Welding Gun Based on ART2 Neural Networks. Int. J. Robot. Autom. Technol. 2017, 4, 1-8.