This paper proposes two new data clustering approaches using the particle swarm optimization algorithm (PSO). It is shown how the PSO can be used to find centroids of a user specified number ofâ€¦ (More)

BACKGROUND, AIM, AND SCOPE
This study focuses on the factors that affect trihalomethane (THMs) formation when dissolved organic matter (DOM) fractions (colloidal, hydrophobic, and transphilicâ€¦ (More)

Given a connected and undirected graph, the quadratic minimum spanning tree problem consists of<lb>finding one spanning tree that minimizes a quadratic cost function. We first propose an integerâ€¦ (More)

The Hamiltonian p-Median Problem consists of determining p disjoint cycles of minimum total cost covering all vertices of a graph. We present several new and existing models for this problem, provideâ€¦ (More)

Given a complete and undirected graph G, the Adjacent Only Minimum Spanning Tree Problem (AQMSTP) consists of finding a spanning tree that minimizes a quadratic function of its adjacent edges. Theâ€¦ (More)