The enumeration of minimal phylogramsSpringer Science and Business Media LLC - Tập 35 - Trang 525-533 - 1973
Ludwig Nastansky, Stanley M. Selkow, Neil F. Stewart
We consider the problem of finding a minimal tree to a set of nodes (of species represented byd characters) in a space ofd-dimensions subject to the hypothesis that evolution is nonconvergent and irreversible. A solution to this problem is formulated, using integer linear programming techniques.
The problem of time unit in Leslie’s population modelSpringer Science and Business Media LLC - Tập 42 - Trang 719-728 - 1980
Paul Cull
The conditions that will allow the lumping together of several age classes in the Leslie model are investigated. We show that if the lumping is to be valid for all population distributions, then the parameters of the model must be periodic. Lumping is valid when the population is in equilibrium, but equilibrium should be tested before the model is lumped.
Generation of Orchard and Tree-Child NetworksSpringer Science and Business Media LLC - Tập 86 - Trang 1-18 - 2023
Gabriel Cardona, Gerard Ribas, Joan Carles Pons
Phylogenetic networks are an extension of phylogenetic trees that allow for the representation of reticulate evolution events. One of the classes of networks that has gained the attention of the scientific community over the last years is the class of orchard networks, that generalizes tree-child networks, one of the most studied classes of networks. In this paper we focus on the combinatorial and...... hiện toàn bộ
Checkpoint method for choice recovery in dynamic programmingSpringer Science and Business Media LLC - Tập 67 - Trang 719-736 - 2005
Eric Bax
Many dynamic programming algorithms consist of a ‘forward pass’ computation to optimize a cost function, followed by a ‘choice recovery’ computation to construct a configuration that optimizes the cost function. ‘Checkpointing’ is a method to perform choice recovery using limited storage. During a forward pass, checkpoints in an optimal configuration are identified. Then recursion is used to fill ...... hiện toàn bộ
Glucose metabolism—A “mixed-cycle” systemSpringer Science and Business Media LLC - Tập 23 - Trang 99-103 - 1961
Sidney Roston
Emphasis upon the importance of homeostatic feedback has drawn attention away from the complexity of biological processes. A study of glucose metabolism indicates the importance of open-cycle as well as closed-cycle mechanisms. Besides the glucose-dependent mechanism of insulin secretion, many open-cycle processes involving the liver, adrenal glands and kidneys, play important roles in the variati...... hiện toàn bộ