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 ...

In the strategic design of a distribution system, the right number of stock points for the various products is an important question. In the last decade, a strong trend in the consumer goods industry led to centralizing the inventory in a single echelon consisting of a few parallel warehouses or even a single distribution center for a Europe-wide distribution system. Centralizing inventory is j...

Software-defined networking (SDN) decouples the control and data planes of traditional networks, logically centralizing the functional properties of the network in the SDN controller. While this centralization brought advantages such as a faster pace of innovation, it also disrupted some of the natural defenses of traditional architectures against different threats. The literature on SDN has mo...