The growing importance and interest in parallel processing within Computer Sciences are undeniable, and thus make it one of the more influencing areas of this discipline. Several reasons support this fact, such as the increase in the computer power, the existence of problems in which the sequential solution times are unacceptable, the possibility of mapping the problem's implicit concurrency into parallel processes in order to minimize response times, etc.
Gorga, Gladys; Madoz, María Cristina
Se realiza una reseña del libro capítulo por capítulo. Los títulos de los capítulos son (en inglés):
Chapter 1 - The Risky Promises and Promising Risks of New Information Technologies for Education
Chapter 2 - Dilemmas of Access and Credibility: Access for Whom? Access to What?
Chapter 3 - Hypertext: Knowledge at the Crossroads
Chapter 4 - Critical reading on Internet
Chapter 5 - Misinformation, Malinformation, Messed-Up Information, and Mostly Useless Information: Is Censorship the Best Response?
Chapter 6 - Surveillance & Privacy: Can Technology Protect What Technology Takes Away?
Chapter 7 - Information for sale: Commercialization & the Educational Potential of the Internet
Chapter 8 -...
Ribeiro, Vinicius Gadis; Weber, Raul Fernando
blic Keys Schemes usually generate two pairs of keys that bear some mathematical relation-usually, a relation of the field known as Number Theory. Identifying a key from another that is given is a problem of great difficulty. This paper presents a public key scheme in wich such key identification is also a great difficulty problem-however, the mathematical problem does not fall under Number Theory; rather, it is one of Differential equations, the rules of Lie groups being the best solution. Even using Lie groups, a problem of great difficulty still remains. The first few examples use Maple 5.0, a symbolic...
Pan, Lin; Zhang, Feng; Yang, Yong; Zheng, Chong-Xun
Skeletal age assessment is one of the important applications of hand radiography in the area of pediatric radiology. Features analysis of the carpal bones can reveal the important information for skeletal age assessment. The present work in this paper faces the problem of the detection of carpal-bone features from its radio-image. A novel and effective segmentation technique is presented in this work with carpal bone image for skeletal age estimation. Carpal bone segmentation is a critical operation of the automatic skeletal age assessment system. This method consists of three procedures. First, the original carpal bone image is preprocessed via anisotropic...
Li, Liangfu; Feng, Zuren; Feng, Yuanjing
Camera calibration is an important task for machine vision, whose goal is to obtain the internal and external parameters of each camera. With these parameters, the 3D positions of a scene point, which is identified and matched in two stereo images, can be determined by the triangulation theory. This paper presents a new accurate estimation of CCD camera parameters for machine vision. We present a fast technique to estimate the camera center with special arrangement of calibration target and the camera model is aimed at efficient computation of camera parameters considering lens distortion. Built on strict geometry constraint, our calibration...
Hernandez, Orlando J.; Khotanzad, Alireza
This paper describes a color texture-based image segmentation system. The color texture information is obtained via modeling with the Multispectral Simultaneous Auto Regressive (MSAR) random field model. The general color content characterized by ratios of sample color means is also used. The image is segmented into regions of uniform color texture using an unsupervised histogram clustering approach that utilizes the combination of MSAR and color features. The performance of the system is tested on two databases containing synthetic mosaics of natural textures and natural scenes, respectively
The present article introduces a five-valued logic and a deductive system. Here, the logic presented is a relevant fragment of the @-logic, which is also a space-time logic. These five values correspond to the following semantics: unknown, possibly known but consistent, false, true, and inconsistent. The present logic and the PLAIN programming language are two results of the same intuitions and from the same philosophical view. Finally, as well as the purposes of PLAIN, the logic ought to be used to support (mobile) agents systems in some manner, besides general purposes.
Aragón, Victoria S.; Esquivel, Susana Cecilia
Non-stationary, or dynamic, problems change over time. There exist a variety of forms of dynamism. The concept of dynamic environments in the context of this paper means that the fitness
landscape changes during the run of an evolutionary algorithm. Genetic diversity is crucial to provide the necessary adaptability of the algorithm to changes. Two mechanism of macromutation are incorporated to the algorithm to maintain genetic diversity in the population. The algorithm was tested on a set of dynamic testing functions provided by a dynamic fitness problem generator. The main goal was to
determinate the algorithm´s ability to reacting to changes of optimum...