The success of constraint-based approaches to geometric modeling has been limited by difficulty in creating constraints, solving them, and presenting them to users. This paper addresses all three issues. We facilitate the creation of constrained models by using placement operations to specify constraints as well as positions, with no extra work on the part of the user. We augment Snap-Dragging[...

Funding: This work received financial support from the association Vaincre La Mucoviscidose. The Laboratory of Human Genetics of Infectious Diseases is supported in part by grants from the Schlumberger and BNP Paribas Foundations, the March of Dimes, and by EU grant QLK2-CT2002-00846. Jean-Laurent Casanova is an International Scholar of the Howard Hughes Medical Institute. C. Soudais is support...

We propose a model of problem solving that provides both structure and focus to search. The model achieves this by combining constraint satisfaction with heuristic search. We introduce the concepts of topology and texture to characterize problem structure and areas to focus attention respectively. The resulting model reduces search complexity and provides a more principled explanation of the na...

I This paper focusses on the characterization and optimization of multicarrier technologies applied to PLC communications in the CENELEC band A. First, we will give a short description of the PLC test bench used by Schlumberger [1] and summarize the key tests that are applied to evaluate a communication technology. In the second part, we will present the key parameters of the multicarrier modul...

We present a probe factor for a simple measurement device, which can be used to determine in-situ electrical resistivity in soils or other penetrable bodies. The probe is primarily sensitive to the material immediately surrounding it and therefore is ideal for determining localized conductivities. The geometry of the probe can be scaled to effectively adjust the region of interest. The calibrat...

Visiting Scientists and Research Affiliates Dr. Arthur K. Jordan, U.S. Navy, Naval Research Laboratory, Washington, DC. Dr. Kevin O'Neill, U.S. Army, Cold Regions Research and Engineering Laboratory, Hanover, New Hampshire. Dr. Michael Tsuk, Digital Equipment Corporation, Tewksbury, Massachusetts. Dr. Akira Itoh, Tokyo National University of Science and Technology, Tokyo, Japan. Dr. Yih-Min Che...