After a short introduction to the BOS project, we discuss the \why, what and how" of the use of formal methods in the project, some recent experience using Promela/Spin and re ections on the pragmatics of validation.

Fig. 1 The de…nition of isogonal conjugates is based on the following theorem (Fig. 1): Theorem 1. Let ABC be a triangle and P a point in its plane. Then, the re‡ections of the lines AP; BP; CP in the angle bisectors of the angles CAB; ABC; BCA concur at one point. This point is called the isogonal conjugate of the point P with respect to triangle ABC: We denote this point by Q: Note that we wo...

Elastic prestack, reverse-time depth migration is applied to both synthetic data and four-component eld data from the Valhall area. Reverse-time extrapolation of the recorded multi-component data is by 2-D elastic nite di erence solution to the full wave equation. An eikonal solver is used to compute the acoustic traveltime from the source to the image points. By using horizontal inline and ver...

Let W be a nite group generated by unitary re ections and A be the set of re ecting hyperplanes. We will give a characterization of the logarithmic di erential forms with poles along A in terms of antiinvariant di erential forms. If W is a Coxeter group de ned over R, then the characterization provides a new method to nd a basis for the module of logarithmic di erential forms out of basic invar...

Ray tracing has become a very popular method for image synthesis due to its un paralleled exibility and its ability the generate images of high quality and realism Simulation of e ects such as re ection and refraction have been the hallmarks of ray tracing since its introduction With the advent of stochastic ray tracing the range of e ects expanded to include motion blur soft shadows depth of e...

The methodical development of object-oriented embedded systems is still an open issue. We discuss the design of complex control functionality through object interactions. Borrowing from the domain of information systems, we argue for the use of independent control classes.

The Traac Information Collator (TIC) 1 (Allport, 1988, 1989) is a prototype system which takes verbatim police reports of traac incidents, interprets them, builds a picture of what is happening on the roads and broadcasts appropriate messages automatically to motorists where necessary. Cahill and Evans (1990) described the process of converting the main TIC lexicon (a lexicon of around 1000 wor...

In this paper, we study the discrete-time approximation of multi-dimensionalre ected BSDEs presented by Hu and Tang [3]. In comparison to the penalizingapproach followed by Hamadï¿1⁄2ne and Jeanblanc [2] or Elie and Kharroubi [1], westudy a more natural scheme based on oblique projections. We provide a controlon the error of the algorithm by introducing and studying the notion o...

This essay presents a summary of the Vedic theory of consciousness in juxtaposition with the parallel ideas of quantum mechanics and neu-roscience. The ancient Vedic tradition of philosophy of consciousness that goes back to at least 2000 BC posits that analytical approaches to deening awareness or personhood end up in paradox. In this tradition one views awareness in terms of the reeection tha...

At a time when ideas of how phonology ought to be done are clearly changing it is important to understand the kinds of thing that induce fundamental change in our science In that spirit I would like to examine here what we know and equally what we think we know about another major change that took place within the relatively recent past in our thinking about sound structure My theme is the role...