Two population models with constrained migrations

Two Population Dynamics Models with Child Care

We will present two age-structured population dynamics models taking into account child care. One of the models includes a harmonic mean type mating of sexes and parental care of offspring and is a generalization of the Hoppensteadt-Staroverov-Hadeler model [1] and a model in [2]. In this model each sex has pre-reproductive and reproductive age grades. All adult individuals (of reproductive age...

Two algorithms for fitting constrained marginal models

The two main algorithms that have been considered for fitting constrained marginal models to discrete data, one based on Lagrange multipliers and the other on a regression model, are studied in detail. It is shown that the updates produced by the two methods are identical, but that the Lagrangian method is more efficient in the case of identically distributed observations. A generalization is g...

Human Migrations: The Two Roads Taken

America was peopled from Asia by at least the end of the last ice age, but the exact timing of entry and the composition of the source population are unclear. A new analysis of two rare mitochondrial haplogroups suggests two separate Asian migrations into the Americas, indicating simultaneous but independent Asian source populations for early American colonists.

Reasoning with Constrained Goal Models

Goal models have been widely used in Computer Science to represent software requirements, business objectives, and design qualities. Existing goal modeling techniques, however, have shown limitations of expressiveness and/or tractability in coping with complex real-world problems. In this work we exploit advances in automated reasoning technologies, notably SMT solvers, to propose and formalize...

A population heuristic for constrained two-dimensional non-guillotine cutting