SensorMap is a portal web site for real-time real-world sensor data. SensorMap allows data owners to easily make their data available on the map. The platform also transparently provides mechanisms to archive and index data, to process queries, to aggregate and present results on a geocentric web interface based on Windows Live Local. In this position paper, we describe the architecture of Sens...

3D virtual environment provides a limited amount of information, mainly focusing on visual information. This is the main cause of users losing the sense of direction in the environment. Many researches for developing a navigation tools that address this problem have been carried out. In this study, a navigation tool is designed by applying topic map, one of the technologies for semantic web con...

With its rapid users growth, Twitter has become an essential source of information about what events are happening in the world. It is critical to have the ability to derive the topics from Twitter messages (tweets), that is, to determine and characterize the main topics of the Twitter messages (tweets). However, tweets are very short in nature and therefore the frequency of term co-occurrences...

This paper gives a short overview not only of the basic concepts of topic maps, but also of the advanced concepts. This document discusses a metadata structure, which allows making a topic map persistent within a relational database. To make integrity checks within topic maps possible, several constraint mechanisms are introduced. Additionally, for building world-wide internet directory service...

In this paper, the authors propose a new chaotic block cryptosystem based on multiple one-dimensional chaotic maps. In the proposed cryptosystem, the authors establish map-to-task relations between the multiple chaotic maps and the tasks, which must be performed in the encryption rounds. The encryption process is based on these map-to-task relations. The authors enhance the security of the cryp...

The main objective of this work is to exploit the relationship between the information findability problem and a subject-based organization of information. Identification of a subject is involved when one wants to say something about that subject or when he or she tries to comprehend what was said by others about it. An example of this type of duality can be seen in the information world where ...

The aim of this paper is to prove the following results: a continuous map f : [0, 1]→ [0, 1] is chaotic iff the shift map σf : lim ← ([0, 1], f)→ lim ← ([0, 1], f) is chaotic. However, this result fails, in general, for arbitrary compact metric spaces. σf : lim ← ([0, 1], f) → lim ← ([0, 1], f) is chaotic iff there exists an increasing sequence of positive integers A such that the topological s...

Houston Anglos of all ages show advanced degrees of /u/-fronting. However, a close acoustic analysis of the fronted /u/ of younger and older Anglo Houstonians reveals two distinct types: a more monophthongal type, consistent with prior descriptions of fronted /u/ in the rural South, and a more diphthongal type, consistent with descriptions of /u/-fronting in non-Southern speakers. The two types...

Concern for environmental issues has become a reality in all sectors of society, mainly among researchers and professionals who work directly with environmental status. In this context, several studies have been undertaken on sustainable development of the Brazilian Amazon, generating a large amount of data and information. Environmental area characterization involves the knowledge about their ...