By studying the detailed dynamics of an ultrashort pulse at the semiconductor{vacuum interfaces, we have shown that the interaction of these pulses with nonstationary semiconductor plasmas can, under appropriate conditions, lead to a variety of interesting phenomena: controlled upshifting of the laser frequency, a possible cascading of upshifting, a trapped pulse bouncing back and forth in the ...

Over the last three years, the Northeast Parallel Architectures Center at Syracuse University, together with Jackson State University and a number of other academic and DoD partners have conducted a pilot project in distance education, using networkbased TANGO Interactive collaboration tool to deliver semester-long academic credit courses in a synchronous (real-time) fashion. This report summar...

With the advent of inexpensive o -the-shelf sonar ranging units sonar has become a common sensor on mobile robotic platforms. Many di erent algorithms have been proposed to obtain environmental layout and other structural information by integrating sonar measurements from multiple positions and/or sensors. Given perfect distance measurements and telemetry, this integration can be fairly simple....

We construct a natural sequence of nite-covolume reeection groups acting on the complex hy-perbolic spaces C H 13 , C H 9 and C H 5 , and show that the 9-dimensional example coincides with the largest of the groups of Mostow 10]. These reeection groups arise as automorphism groups of certain Lorentzian lattices over the Eisenstein integers, and we obtain our largest example by using the complex...

Highly re ̄ective linear features occur in water depths of 20±30 m in northern Bristol Bay (Alaska, USA) and are, in places, over 600 m in length. Their length-to-width ratio is over 100:1. The lineations are usually characterized by large transverse ripples with wavelengths of 1±2 m. The lineations trend about N60°E, and are spaced between 20 and 350 m. Main tidal directions near the lineations...

The paper presents analytically computable scenes for testing global illumination algorithms with arbitrary BRDFs. The task of these scenes is to enable us to compare global illumination algorithms and check the correctness of the implementation. In our rst approach a criterion is given that makes the radiance constant for an arbitrary closed scene allowing either arbitrary BRDFs or arbitrary l...

Viewpoints are re ections of software systems from multiple perspectives. A number of consistency conditions apply to viewpoints and developers require a tool for each type of viewpoint. These tools need to support consistency management. Inter-viewpoint consistency can only be checked when tools are integrated into a viewpoint development environment. We brie y outline the functionality develo...

Automating the learning of causal models from sample data is a key step toward incorporating machine learning into decisionmaking and reasoning under uncertainty. This paper presents a Bayesian approach to the discovery of causal models, using a Minimum Message Length (MML) method. We have developed encoding and search methods for discovering linear causal models. The initial experimental resul...

Common room compensation algorithms are capable of dereverberating the listening room at some discrete points only. Outside these equalization points the sound quality is often even worse compared to the unequalized case. As wave £eld synthesis in principle allows to control the wave £eld within the listening area it can also be used to compensate for the re¤ections caused by the listening room...

The paper presents analytically computable scenes for testing global illumination algorithms with arbitrary BRDFs. The task of these scenes is to enable us to compare global illumination algorithms and check the correctness of the implementation. In our rst approach a criterion is given that makes the radiance constant for an arbitrary closed scene allowing either arbitrary BRDFs or arbitrary l...