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In this paper we study the boundary exact controllability for the equation $$\frac{\partial }{\partial t}\left(\alpha \left(t\right)\frac{\partial y}{\partial t}\right)-\sum _{j=1}^n\frac{\partial }{\partial x_j}\left(\beta \left(t\right)a\left(x\right)\frac{\partial y}{\partial x_j}\right)=0\text{in}\Omega \times (0,T),$$ when the control action is of Dirichlet-Neumann form and $\Omega$ is a bounded domain in $R^n$. The result is obtained by applying the HUM (Hilbert Uniqueness Method) due to J. L. Lions.

The present paper studies the existence and uniqueness of global solutions and decay rates to a given nonlinear hyperbolic problem.