In many global optimization problems motivated by engineering applications, the number of function evaluations is severely limited by time or cost. To ensure that each of these evaluations usefully contributes to the localization of good candidates for the role of global minimizer, a stochastic model of the function can be built to conduct a sequential choice of evaluation points. Based on Gaus...

We construct a Gause-type predator-prey model with concave prey isocline and (at least) two limit cycles. This serves as a counter-example to the global stability criterion of Hsu [Math. Biosci. 39:1-10 (1978)].

I. The global theory: a miscellany . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 1.1. Generalities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 1.2. A criterion for connectedness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 1.3. Dependence on the ground field . . . . . . . . . . . . . . . . . ...

A novel approach to estimating sinusoidd parameters of musical tones is presented. The proposed algorithm uses a quadratic polynomial phase sinusoidal model and a global waveform fitting criterion to obtain optimal model parameter estimates.

Constraints allow programmers and users to state declaratively a relation that should be maintained, rather than requiring them to write procedures to maintain the relation themselves. They are thus useful in many applications such as user interface and simulation packages. In many situations, it is desirable to be able to state both hard and soft constraints. The hard constraints must hold, an...

Most machine learning and data mining algorithms require that the training data contain only discrete attributes, which makes it necessary to discretize continuous numeric attributes. Bottom-up discretization algorithms are well-known methods. They mainly focus on discretizing data based on either local or global independence measure. In this paper, we present a novel bottom-up discretization m...

Indexing of video soundtracks is an important issue for the navigation in multimedia databases. Based on wordspotting techniques, it should meet very constraining specifications; namely fast response to queries, concise processed speech information for limiting the storage memory, speaker independant mode, easy characterization of any word by its phonemic spelling. A solution based on phonemic ...

Purpose Global analyses using mean deviation (MD) assess visual field progression, but can miss localized changes. Pointwise analyses are more sensitive to localized progression, but more variable so require confirmation. This study assessed whether cluster trend analysis, averaging information across subsets of locations, could improve progression detection. Methods A total of 133 test-retes...