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We start from a Lagrangian describing scalar "nucleons" and mesons whichinteract through a simple vertex. Okubo's method of unitary transformation isused to describe a single nucleon dressed by its meson cloud. We find anexpression for the physical mass of the nucleon being correct up to secondorder in the coupling constant. It is then verified that this result is thesame as the corresponding expression found by Feynman techniques. Finally wealso express the three boost operators in terms of the physical nucleon mass.Doing so we find expressions for all the ten generators of Poincar\'etransformations for the system of one single dressed nucleon.Comment: 19 pages, no figure

One-nucleon effective generators of the Poincaré group derived from a field theory: Mass renormalization