The convolutional kernels are weight vectors represented by W ∈ R d×k(w+p) and the number of kernels is d. In summary, the convolu-tional operation follows the equation,  (Zeng et al., 2015) improves the max-pooling operation with a piecewise method whose outputs of convolutional filters are divided into three segments by head and tail entities.
the max pooling procedure is performed in three segments separately.