With the popularization of Smartphones with GPS, there is a huge amount of data with spatial and textual information being produced and shared. Hybrid indexes that combine spatial and textual information are being proposed to process queries efficiently. One of the most efficient indexes is S2I (Spatial Inverted Index). However, S2I has a major drawback in terms of index size. In this paper, we...

Investigate a method for combining two dispersed-dot halftoning masks for two colors that generalizes the traditional angular displacement used with clustered-dot halftone screens. We used two variations of the Linear Pixel Shuffling algebraic mask algorithm involving numbers arising from two third order, Fibonacci-like recurrences, As an alternative to screen rotation, masks were flipped and r...

This paper describes qddb, a database program suite that addresses the common situation in which data are infrequently changed. Searches in the stable parts of databases are very e cient because they use hash-based searching through a completely inverted index, whereas searches in updated sections are less so. All les used by qddb are in Ascii format, so they can be easily modied by a knowledge...

Supporting entity extraction from large document collections is important for enabling a variety of important data analysis tasks. In this paper, we introduce the “ad-hoc” entity extraction task where entities of interest are constrained to be from a list of entities that is specific to the task. In such scenarios, traditional entity extraction techniques that process all the documents for each...

An important module of soft computing methods is the set overlap operation. If a query set is tested with a large pool of source sets, the signature-based or the inverted-file methods are used to reduce the cost of operation. The paper introduces a modified version of the inverted-file approach, which yields in lowest costs for sparse input samples, i.e. where the number of records containing a...

Repetition is often associated with traditional teaching drills. Yet, it has been documented how repetitions are exploited by learners themselves (Duff, 2000). In a study of immersion classroom conversations, it was found that playful recyclings were recurrent features of young learners’ second language repertoires. Such joking events were identified on the basis of the participants’ displayed ...

In this paper, we present an efficient content-based video copy detection method based on vocabulary tree and inverted files. The copy detection system exploits complementary local features and video sequence matching. Using two different local features, vocabulary trees and inverted files are built respectively to get keyframes matching result. Histogram-based and diagonal-based sequence match...

Flipping the classroom is a current pedagogical innovation in many schools and universities. Although interest in flipped classroom (or Inverted Classroom) continues to grow, its implementation so far has been driven more by teachers’ intuitive beliefs, rather than empirically-based principles. Many studies merely replace in-class instructions with videos and use class time for group discussion...

The basic aim of the model proposed here is to automatically build semantic metatext structure for texts that would allow us to search and extract discourse and semantic information from texts indexed in that way. This model is built up from two engines: The first engine, called EXCOM (Djioua et al., 2006), is an XML based system for an automatic annotation of texts according to discourse and s...

Modern document collections often contain groups of documents with overlapping or shared content. However, most information retrieval systems process each document separately, causing shared content to be indexed multiple times. In this paper, we describe a new document representation model where related documents are organized as a tree, allowing shared content to be indexed just once. We show...