GSch and GS conceived and performed the research; GSch implemented the algorithms and carried out analyses; BC helped with the implementation of the clustering; TC and AB provided the data, GSch, GS and AB drafted the manuscript.
These efforts have focused on the design and the implementation of the cluster-based Fault-Tolerant stateful Firewall (FT-FW) architecture.
An example involving a 110-km pipeline interval is employed to illustrate the implementation of the clustering approach.
After that, we present a distributed implementation of the clustering algorithm based on fuzzy C-means method.
The implementation of the clustering and the TF-IDF cosine similarity to the targets was the same as for the berrypicking scenario.
We propose a centralized clustering algorithm based on spectral partitioning and a distributed implementation of the clustering method based on fuzzy C-means in cluster head selection.
In future work we will follow two ways of improving scalability of the clustering: optimizing the access to the similarity values and investigating implications of a parallel implementation of the clustering procedure.
Inspired by this, we propose a more sophisticated implementation of the clustering phase, Projection-based CENI (P-CENI), which provides users an additional degree of freedom: the dimension of the nodes' representations.
