Multivariable inferential feedback control of distillation compositions using principal component regression (PCR) models is presented in this paper. Both static and dynamic models are studied. PCR model based software sensors are developed from process operational data, so that the top and bottom product compositions can be estimated from multitray temperature measurements. The problems of col...

A new part segmentation approach is presented which works on real images. These images contain 3D objects with textures and shadows on a complex background. The proposed approach relies on the outline of the object to guide the grouping of lines using symmetry and colinearity principles. This grouping of lines leads to simple shapes which can be modeled by 3D primitives such as geons or general...

Detailed analysis of the modular Type I polyketide synthase (PKS) involved in the biosynthesis of the marginolactone azalomycin F in mangrove Streptomyces sp. 211726 has shown that only nineteen extension modules are required to accomplish twenty cycles of polyketide chain elongation. Analysis of the products of a PKS mutant specifically inactivated in the dehydratase domain of extension-module...

The deuterostomes are the clade of animals for which we have the most detailed understanding of Hox cluster organisation. With the Hox cluster of amphioxus (Branchiostoma floridae) we have the best prototypical, least derived Hox cluster for the group, whilst the urochordates present us with some of the most highly derived and disintegrated clusters. Combined with the detailed mechanistic under...

Comparative genomic studies among highly divergent species have been problematic because reduced gene similarities make orthologous gene pairs difficult to identify and because colinearity is expected to be low with greater time since divergence from the last common ancestor. Nevertheless, synteny between divergent taxa in several lineages has been detected over short chromosomal segments. We h...

A general linear spatial database model is presented in which both the representation and the manipulation of non spatial data is based on rst order logic over the real numbers with addition We rst argue the naturalness of our model and propose it as a general framework to study and compare linear spatial database models However we also establish that no reasonable safe extension of our data ma...

In this paper, an algorithm for identifying an object from a set of known objects is presented and justified. The novelty of this algorithm, called Mask, for object identification is in its use of three-dimensional data which has been obtained from projection of parallel laser light planes. The knowledge that laser light planes are parallel to each other allows automatic discovery of two constr...

Heterosis describes the superior performance of heterozygous hybrid plants over their homozygous parental inbred lines. Despite the rediscovery of this phenomenon a century ago and its paramount agronomic importance, the genetic and molecular basis of heterosis remains enigmatic. Recently, various pioneer studies described differences in genome organization and gene expression of hybrids and th...

Hyperacuity thresholds of a few arc seconds can be achieved psychophysically for a variety of spatial localization tasks. The present experiments show that evoked potentials can be elicited in response to the introduction of vernier offsets, but not by the introduction of other cues to hyperacuity such as bisection or relative pattern motion, although each of these cues is equally salient psych...