For a graph property P and a graph G, a subset S of the vertices of G is a P-set if the subgraph induced by S has the property P. A P-Roman dominating function on a graph G is a labeling f : V (G) → {0, 1, 2} such that every vertex with label 0 has a neighbor with label 2 and the set of all vertices with label 1 or 2 is a P-set. The P-Roman domination number γPR(G) of G is the minimum of Σv∈V (...

( a Department of Civil Engineering, Tsinghua University, Beijing 100084, China) Abstract: Considering high speed following on expressway or highway, an improved car-following model is developed in this paper by introducing variable safety headway distance. Stability analysis of the new model is carried out using the control theory method. Finally, numerical simulations are implemented and the ...

The Romans were perhaps the most impressive exponents of water resource management in preindustrial times with irrigation and virtual water trade facilitating unprecedented urbanization and socioeconomic stability for hundreds of years in a region of highly variable climate. To understand Roman water resource management in response to urbanization and climate variability, a Virtual Water Networ...

A geometrical analysis of the meander decorative patterns on a Roman pavement mosaic found at the Roman villa in Chedworth, England, is presented. The analysis reveals that the intricate swastika meander pattern consisting of four closed curves could have been easily constructed using a very simple hypothesized algorithm. The algorithm also explains the design of Roman swastika meanders found t...

Résumé. Les systèmes de gestion des connaissances servent de support pour la création et la diffusion de mémoires d’entreprises qui permettent de capitaliser, conserver et enrichir les connaissances des experts. Dans ces systèmes, l’interaction avec les experts est effectuée avec des outils adaptés dans lesquels une formalisation graphique des connaissances est utilisée. Cette formalisation est...

An update summary should provide a fluent summarization of new information on a timeevolving topic, assuming that the reader has already reviewed older documents or summaries. In 2007 and 2008, an annual summarization evaluation included an update summarization task. Several participating systems produced update summaries indistinguishable from humangenerated summaries when measured using ROUGE...

RÉSUMÉ. Les projets de bibliothèques numériques actuels offrent à l’utilisateur l’accès aux thèses à partir d’une recherche qui ne permet pas d’extraire les parties pertinentes de la thèse et ne renvoie que la thèse intégrale. Ainsi, l’utilisateur doit lire des chapitres entiers pour connaître les parties qui correspondent à son besoin. Le projet CITHER (Consultation en texte Intégral des THèse...

Roman seals associated with collyria (Latin expression for eye drops/washes and lotions for eye maintenance) provide valuable information about eye care in the antiquity. These small, usually stone-made pieces bore engravings with the names of eye doctors and also the collyria used to treat an eye disease. The collyria seals have been found all over the Roman empire and Celtic territories in pa...