In this paper, the illumination problem of face recognition is investigated. A conclusion is drawn that the logarithm vertical gradient (LVG) of face images is more robust to varying lighting than the logarithm horizontal gradient (LHG). When the variation of illumination is large, LVG will be a better representation of the face image than logarithm gradient (LG). Although both LVG and LHG can ...

Between 1997 and 2003, the share of workers subject to mental health parity laws greatly increased. But because of exemptions for self-insured firms and small firms, coverage is much lower than a simple tally of state mandates would suggest. Limits on the types of conditions covered further weaken these laws. This paper summarizes the extent and scope of state parity legislation in terms of the...

In this paper, we investigate effects of vacancy defects on fracture of carbon nanotubes and carbon nanotube/ aluminum composites. Our studies show that even a one-atom vacancy defect can dramatically reduce the failure stresses and strains of carbon nanotubes. Consequently, nanocomposites, in which vacancy-defected nanotubes are embedded, exhibit different characteristics from those in which p...

Various proposals have been made to extend object-oriented languages and database systems with roles because they allow to weaken strict typing concepts and therefore can provide mechanisms for an object to change its type during its lifetime. But this so-called object migration is not the only advantage ooered by a suitable role model. This paper studies the possibilities to use roles for a ge...

Formal methods for verifying authentication protocols tend to assume an idealised perfect form of encryption This approach has been spec tacularly successful in nding aws but when we aim for proofs of cor rectness then we need to consider this assumption more carefully and perhaps to weaken it to re ect properties of real cryptographic mech anisms This paper reviews the existing CSP approach to...

J.R. Meginniss modified expected utility to accommodate a concept of the utility of gambling that led to a representation composed of a utility expectation term plus an entropy of degree κ term. He imposed several apparently strong assumptions. One of these is that a number of unknown generating functions are identical. A second is that he assumed he was working with given probabilities. Here w...

Connectionism as a model of the mind has been attacked by the advocators of the classical paradigm, who claim that Connectionism can only work if it is an implementation of Classical representations. This could be true for some of the models that claim to be Connectionist, but it will in this paper be shown that this is not true for Connectionist architectures that use non-symbolic representati...

Expressions to describe the initial collection efficiency of electret filters for both charged and neutral particles were derived covering a wide range of Coulombic force and induced force parameters including the interceptional effect. The prediction equations were in good agreement with the experimental data. Further, the electret charge stability in humid air and in exposure to liquid and so...

Music is primarily auditory but also includes visual elements such as: notation or mental images while hearing music. Music television like MTV or the visualization of music by visual jockeys (VJs) are further examples of combining music with images. However, not much is known about the interaction between auditory and visual representation and perception [1]. How can graphic visualizations int...