In an M/G/1 environment with finite waiting room, the server, for each new customer to be served, may choose any of k different service modes. Under a certain cost structure and certain assumptions about the different "speeds" of service it is shown that the search for an optimal policy can be...

Spatial statistical models are applied in many problems for which dependence in observed random variables is not easily explained by a direct scientific mechanism. In such situations there may be a latent spatial process that acts to produce the observed spatial pattern. We present methods for...