Recent analyses of solar photospheric abundances suggest that the oxygen abundance in the solar atmosphere needs to be revised downwards. In this study we investigate the consequence of this revision on helioseismic analyses of the depth of the solar convection zone and the helium abundance in the solar envelope and find no significant effect. We also find that the revised abundances along with...

Many learning systems must confront the problem of run time after learning being greater than run time before learning. This utility problem has been a particular focus of research in explanation-based learning. In past work we have examined an approach to the utility problem that is based on restricting the expressiveness of the rule language so as to guarantee polynomial bounds on the cost of...

M. Kunz,* N. Aghanim, L. Cayon, O. Forni, A. Riazuelo, and J. P. Uzan Département de Physique Théorique, Université de Genève, 24 quai Ernest Ansermet, CH-1211 Geneva 4, Switzerland Astronomy Centre, SciTech, University of Sussex, Brighton BN1 9QJ, United Kingdom Institut d’Astrophysique Spatiale (IAS), Bâtiment 121, F-91405, Orsay, France; Université Paris-Sud 11 et CNRS (UMR 8617) Department ...

Despite the potential for many possible secondary-structure conformations, the native sequence of ribosomal RNA (rRNA) is able to find the correct and universally conserved core fold. This study reports a computational analysis investigating two mechanisms that appear to constrain rRNA secondary-structure conformational space: ribosomal proteins and rRNA sequence composition. The analysis was c...

BACKGROUND Initiatives on integrated care between hospitals and community health centers (CHCs) have been introduced to transform the current fragmented health care delivery system into an integrated system in China. Up to date no research has analyzed in-depth the experiences of these initiatives based on perspectives from various stakeholders. This study analyzed the integrated care pilot in ...

Japan is widely perceived to have a low level of HIV occurrence; however, its HIV epidemics also have been the subject of considerable misunderstanding globally. I used a ground truthing conceptual framework to meet two aims: first, to determine how accurately official surveillance data represented Japan's two largest epidemics (urban Kansai and Tokyo) as understood and experienced on the groun...

A probabilistic constrained stochastic programming problem is considered, where the underlying problem has linear constraints with random technology matrix. The rows of the matrix are assumed to be stochastically independent and normally distributed. For the convexity of the problem the quasi-concavity of the constraining function is needed that is ensured if the factors are uniformly quasiconc...