I will present recent results relating to two problems in Fourier analysis, L-improving properties of convolutions with singular measures and the Fourier restriction problem, both of which deal with the analysis of operators associated to submanifolds of Euclidean space. In both cases the theory is much more welldeveloped for curves and hypersurfaces than it is for submanifolds of intermediate ...

This paper describes work underway at the Krasnow Institute for Advanced Study on the topic of modeling social trust. We have built and are testing an ACT-R model intended to replicate human participants building and maintaining social trust using an economic investment game. We already have behavioral and fMRI imaging data for subjects which we expect to generate comparable data by having an A...

Symbolic mathematical software has become inexpensive enough that it is almost practical to require each first-year calculus student to purchase it. But having a program do math for you might not be learning, and does not teach you how to apply it. This paper examines research issues related to learning calculus including cognitive processes, the role of proficiency and a proposed causal model....

New developments in urban planning, urban landscape, real estate management and so on, call for new demands for 3D Object Model. The building models are the most important in 3D object model. With the development of 3D data acquisition, the visualization aspect often is detail considered, however, only a few investigation about the creating and storing of 3D object model is discussed. In this p...

Seldom research work has been done about cloverleaf junction expression in a 3-dimensional city model (3DCM). The main reason is that the cloverleaf junction is often in a complex and enormous construction. Its main body is bestraddle in air, and has aerial intersections between its parts. This complex feature made cloverleaf junction quite different from buildings and terrain, therefore, it is...

Several studies have suggested recently that a more dynamic conflict resolution mechanism in the ACT–R cognitive architecture (Anderson & Lebiere, 1998) could improve the decision–making behaviour of cognitive models. This part of ACT–R theory is revisited and a new solution is proposed. The new algorithm (OPTIMIST) has been implemented as an overlay to the ACT–R architecture, and can be used a...

A robust crop model can assist in genetic improvement and cultural management of the crop. The objectives of this study were to describe a wheat (Triticum aestivum L.) model and to report results of its evaluation. The model simulates phenological development, leaf development and senescence, crop mass production and partitioning, plant nitrogen balance, yield formation and soil water and ...

background: abdominal circumference (ac), biparietal diameters (bpd) and femoral length (fl) are now the main parameters used to obtain estimated fetal weight (efw). although the role of soft tissue parameters in determining fetal weight was proved but clinical attention to mid-thigh soft tissue thickness (stt) is limited. objective: to find the impression of stt on birth weight (bw) and repres...