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Biomedical subjects

M Dorigo

Publications and source records attributed to M Dorigo.

9 recordsLinked to original sources
PubMed2000

Inspiration for optimization from social insect behaviour.

Research in social insect behaviour has provided computer scientists with powerful methods for designing distributed control and optimization algorithms. These techniques are being applied successfully to a variety of scientific and engineering problems. In addition to achieving good performance on a wide spectrum of 'static' problems, such techniques tend to exhibit a high degree of flexibility and robustness in a dynamic environment.

Algorithms↗
PubMed1999

Ant algorithms for discrete optimization.

This article presents an overview of recent work on ant algorithms, that is, algorithms for discrete optimization that took inspiration from the observation of ant colonies' foraging behavior, and introduces the ant colony optimization (ACO) metaheuristic. In the first part of the article the basic biological findings on real ants are reviewed and their artificial counterparts as well as the ACO metaheuristic are defined. In the second part of the article a number of applications of ACO algorithms to combinatorial optimization and routing in communications networks are described. We conclude with a discussion of related work and of some of the most important aspects of the ACO metaheuristic.

Algorithms↗
PubMed1997

Ant colonies for the travelling salesman problem.

We describe an artificial ant colony capable of solving the travelling salesman problem (TSP). Ants of the artificial colony are able to generate successively shorter feasible tours by using information accumulated in the form of a pheromone trail deposited on the edges of the TSP graph. Computer simulations demonstrate that the artificial ant colony is capable of generating good solutions to both symmetric and asymmetric instances of the TSP. The method is an example, like simulated annealing, neural networks and evolutionary computation, of the successful use of a natural metaphor to design an optimization algorithm.

Algorithms↗
PubMed1979

[Correlations between splenoportographic findings and risk of digestive hemorrhage in portal hypertension].

In 102 cases examined by splenoportography (93 cirrhosis with patent splenoportal axis and 9 splenoportal thrombosis without appreciable liver changes), the occurrence of episodes of digestive haemorrhage was statistically correlated with age, sex, type of portal impediment, type of collateral circulation, and the presence or otherwise of ascites, and with portal pressure values measured by splenomanometry. The only statistically significant correlation was that concerning the type of hepatofugal collateral circulation, as digestive haemorrhage proved gradually less frequent in patients with gastro-oesophageal collateral circulation, in those with so-called infraportal collateral circulation and, finally, in those where angiography was unable to demonstrate the presence of any collateral circulation at all.

Adolescent↗
PubMed1975

[Statistical analysis of correlations between tonsillectomy and malignant neoplasms of the thyroid].

An analysis of correlations between tonsillectomized patients with thyroid cancer and a control group with respect to sex, histological type and blood group did not throw up anything of statistical significance. Of great statistical significance, however, was the age factor in sufferers from malignant cancer, whether or not their tonsils had been removed; in fact tonsillectomized subjects were affected by malignant cancer at a younger age than those who had not undergone the operation. It is concluded that, at the moment of greatest immunological production, the tonsils seem to represent a barrier to the onset of malignant cancer in general, and thyroid types in particular.

Adenocarcinoma↗