POCAD is an improvement version of McPAD which is a novel Payload-based anomaly intrusion detection system. I published an earlier version of POCAD [1], and I also worked with it for my thesis. The paper can be found here

[1] Nguyen, Xuan Nam, Dai Tho Nguyen, and Long Hai Vu. "POCAD: A novel pay load-based one-class classifier for anomaly detection." 2016 3rd National Foundation for Science and Technology Development Conference on Information and Computer Science (NICS). IEEE, 2016.