A semantic similarity approach to electronic document modeling and integration

The World Wide Web is an enormous collection of information resources serving various purposes. However, the diversity of the Web information, as well as its related formats, makes it very difficult for users to efficiently search and obtain the information they require. The reason for the difficulty is because most of the information uploaded on to the Web is unstructured or semi-structured. Many meta-data models have been proposed to respond to this problem. These models attempt to provide a certain kind of general description for the Web information in order to improve its structuredness. Although these documents consist of the largest portion of the Web information or Web resources, few meta-data models deal with ill-structured Web documents by analyzing their semantic relations with each other. In this paper, we consider this huge set of Web information, called electronic documents. We propose a meta-data model called the EDM (Electronic Document Metadata) model. Using this model, we can extract the semantic characteristics from electronic documents and then use these characteristics to form a semantic electronic document model. This model, inversely, provides a basis for the analysis of semantic similarity between electronic documents and for electronic document integration. This document modeling and integration supports further manipulations on the electronic documents, such as document exchange, searching and evolution.published_or_final_versio

Text-Source Discovery and GlOSS Update in a Dynamic Web

A method for evaluating the porosity volume content in composite laminates using the slope of the ultrasonic attenuation with respect to frequency has been reported before in these proceedings1,2. The method was first applied to laminates laid up from unidirectional prepreg tapes and has now been extended to the case of woven composite laminates. It was found that a linear relationship still holds between the porosity volume fraction and the attenuation slope; however, the constant of proportionality is quite different for the case of woven laminates. This difference is attributed to the differences in pore morphology in the woven and nonwoven laminates. Qualitatively, the voids are flatter and longer (needle-like or strip-crack-like) in the interlaminar region of nonwoven laminates of unidirectional prepregs and are very effective in blocking the sound energy. On the other hand, voids tend to be localized in the resin-rich pockets of woven laminates and remain spherical, as shown in Fig. 1. The attenuation and the slope of the attenuation are therefore lower (by about a factor of 2) in the woven composite for the same amount of porosity content. Quantitatively, the “void content-attenuation slope” relationship is modeled for both woven and nonwoven laminates in terms of the scattering amplitude of P-waves from voids of different shapes