116,639 research outputs found
Global solution to the Allen-Cahn equation with singular potentials and dynamic boundary conditions
We prove well-posedness results for the solution to an initial and
boundary-value problem for an Allen-Cahn type equation describing the
phenomenon of phase transitions for a material contained in a bounded and
regular domain. The dynamic boundary conditions for the order parameter have
been recently proposed by some physicists to account for interactions with the
walls. We show our results using suitable regularizations of the nonlinearities
of the problem and performing some a priori estimates which allow us to pass to
the limit thanks to compactness and monotonicity arguments.Comment: Key words: Allen-Cahn equation, dynamic boundary conditions, maximal
monotone graphs, initial boundary value problem, existence and uniqueness
result
Information extraction
In this paper we present a new approach to extract relevant information by knowledge graphs from natural language text. We give a multiple level model based on knowledge graphs for describing template information, and investigate the concept of partial structural parsing. Moreover, we point out that expansion of concepts plays an important role in thinking, so we study the expansion of knowledge graphs to use context information for reasoning and merging of templates
Context and Keyword Extraction in Plain Text Using a Graph Representation
Document indexation is an essential task achieved by archivists or automatic
indexing tools. To retrieve relevant documents to a query, keywords describing
this document have to be carefully chosen. Archivists have to find out the
right topic of a document before starting to extract the keywords. For an
archivist indexing specialized documents, experience plays an important role.
But indexing documents on different topics is much harder. This article
proposes an innovative method for an indexing support system. This system takes
as input an ontology and a plain text document and provides as output
contextualized keywords of the document. The method has been evaluated by
exploiting Wikipedia's category links as a termino-ontological resources
A graph theoretical analysis of certain aspects of Bahasa Indonesia
In this paper the theory of knowledge graphs is applied to some characteristic features of the Indonesian language. The characteristic features to be considered are active and passive form of verbs and the derived noun
- …