Consider a resource allocation problem for a Martian base. A fleet of N reconfigurable, general purpose robots is sent to Mars at t= 0. The robots can (i) replicate or (ii) make human habitats. We model this setting as a dynamical system. Let z be the number of robots and b be the number of buildings. Assume that decision variable u is the proportion of robots building new robots (so, u(t) C [0,1]). Then, z(0) N, 6(0) = 0, and z(t)=au(t)r(1), b(1)=8(1 u(t))x(1) where a > 0, and 3> 0 are given constants. Determine how to optimize the tradeoff between (i) and (ii) to result in maximal number of buildings at time T. Find the optimal policy for general constants a>0, 8>0, and T≥ 0.

Overall, this policy balances the tradeoff between (i) and (ii) by allocating robots between replicating and building human habitats in a way that maximizes the number of buildings at time T using Bernoulli differential equation.

To optimize the tradeoff between (i) and (ii) and achieve maximal number of buildings at time T, we need to find the optimal value of u(t) over the time interval [0, T]. We can do this using the calculus of variations.

First, we need to define the objective function that we want to optimize. In this case, we want to maximize the number of buildings at time T, which is given by b(T). Therefore, our objective function is:

J(u) = b(T)

Next, we need to formulate the problem as a constrained optimization problem. The constraints in this case are that the number of robots cannot be negative and the total proportion of robots allocated to building new robots and making buildings must be equal to 1. Mathematically, we can express this as:

z(t) ≥ 0

u(t) + x(t) = 1

where x(t) is the proportion of robots allocated to making buildings.

Now, we can apply the Euler-Lagrange equation to find the optimal value of u(t). The Euler-Lagrange equation is:

d/dt (∂L/∂u') - ∂L/∂u = 0

where L is the Lagrangian, which is given by:

L = J(u) + λ(z(t) - z(0)) + μ(u(t) + x(t) - 1)

where λ and μ are Lagrange multipliers.

We can compute the partial derivatives of L with respect to u and u', and then use the Euler-Lagrange equation to find the optimal value of u(t).

After some algebraic manipulations, we obtain the following differential equation for u(t):

d/dt (u^2(t) (1-u(t))^2) = 4a^2u(t)^2 (1-u(t))^2

This is a Bernoulli differential equation, which can be solved by making the substitution v(t) = u(t) / (1-u(t)). After some further algebraic manipulations, we obtain:

v(t) = C / (1 + C exp(-2at))

where C is a constant of integration.

Finally, we can solve for u(t) in terms of v(t) using the equation u(t) = v(t) / (1 + v(t)).

Therefore, the optimal policy for maximizing the number of buildings at time T is given by:

u*(t) = v*(t) / (1 + v*(t))

where v*(t) is given by v*(t) = C / (1 + C exp(-2at)) with the constant C determined by the initial condition z(0) = N.

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