We will say that a network is time consistent if it admits a time assignment (Baroni et al., 2006).
From a biological point of view, a time assignment represents the time when a certain species exists, or a certain hybridization process occurs.
A time assignment on a network N= V, E) is a mapping τ: V→ℕ such that: τ(r )=0, where r is the root of N. If v is a hybrid node and (u, v )∈ E, then τ u )=τ(v ).
Seal the deal by giving them a timed assignment -- something they could encounter regularly in the role their applying for -- and see how they perform.
It took CPLEX approximately 1 h to compute the optimal divergence time assignment of a strain-tree topology, given a set of 1898 gene trees, on a 3.2 GHz Intel Pentium 4 machine, running Linux, with 1GB of RAM.
Then, all its children are leaves: indeed, if a child of u were an internal tree node, then its time assignment would be strictly greater than that of u, against our assumption; also, if a child of u were a hybrid node, then its time assignment would be the same as that of u, and hence M would contain a hybrid node.
To pull this off, the department has taken what had been a part-time job for a handful of Fire Academy instructors, and expanded it into a full-time assignment for a staff of 56.
In a time-slotted wireless network, a link schedule is to find a time slot assignment for each link, and it is called valid if at any time slot, two active links are not conflicting.
In this paper, therefore, the objective of link scheduling is to determine a time slot assignment for all links or flows with a smallest possible schedule period, such that not only interference can be avoided, but also each node has enough energy upon being scheduled.
The framework includes three components, a stochastic gate assignment model, a real-time assignment rule, and two penalty adjustment methods.
"It's a big-time assignment," Wilson said, smiling brightly.
