The effects of random environmental impacts on optimal exploitation of a fish population are investigated using both optimization and simulation, based on a discrete-time age-structured bioeconomic model. The optimization problem is solved as a non-linear programming problem in GAMS. First, a...

In this paper, we state sufficiency, necessity, convergence, existence and uniqueness results for infinite horizon optimal control problems with unbounded payoffs in which the assumptions are very weak and there are no topological assumptions about the model components. We also state a sequence...

In spite of a manager's best attempts, a managed rangeland may hit an irreversible state in which it provides neither consumptive nor non-consumptive services to humans. Therefore, given a particular time based management regime, it is useful to know how long it takes for a rangeland to hit the...

We discuss a few supply chain design concepts and optimization models that have been applied in the energy sector. It is not our intention to provide a comprehensive review of the vast literature. Our goal is to provide the reader with pointers to some interesting and challenging problems,...

In spite of a manager's best attempts, a managed rangeland may hit an irreversible state in which it provides neither consumptive nor non-consumptive services to humans. Therefore, given a particular time based management regime, it is useful to know how long it takes for a rangeland to hit the...

We develop a simple model of managing a system subject to pollution damage under risk of an abrupt and random jump in the damage coefficient. The model allows the full dynamic characterization of the optimal emission policies under uncertainty. The results, that imply prudent behavior due to...

Environmental policy related to agriculture is generally administered by a government agency charged with achieving legislative objectives. The enabling legislation of an agency typically establishes a set of tools that the agency uses to influence the behavior on non-governmental agricultural...

We develop a simple model of managing a system subject to pollution damage under risk of an abrupt and random jump in the damage coefficient. The model allows the full dynamic characterization of the optimal emission policies under uncertainty. The results, that imply prudent behavior due to...

The simultaneous optimization of multiple queries submitted to adatabase system may lead to substantial savings over the current approach ofoptimizing each query separately. Isolating common subexpressions in multiplequeries and treating their execution as a sharable resource are...