We consider some elliptic semilinear boundary value problem set either in the quadrant {χ1 >0} x {χN > 0} or in the halfspace {χ1 >0} if RN , and we classify the asymptotoc behavior of the solution as χ1 -> +. The dimension N is taken up to 5 or up to 4, according to the case, and the nonlinearity is of dissipative type. The proof are a combination of techniques borrowed from dynamical systems (to construct a global attractor of solutions) and from partial differential equations (to classify the limit profile of the solutions, to wit the elements of the global attractor).