Search results for "Trees"

La vite ad alberello e il giardino pantesco. Dinamiche globali di patrimonializzazione culturale ed economia locale

2021

In questo breve contributo proverò a introdurre il ruolo e la simbologia dell'albero nella società pantesca contemporanea in una prospettiva antropologica. Sintetizzando alcune fasi della mia ricerca sul campo sull'isola di Pantelleria, ho tentato di comprendere le dinamiche che hanno portato ai riconoscimenti Unesco della pratica della vite ad alberello e dei muretti a secco, così come al riconoscimento del giardino pantesco, e le conseguenze da questi determinate nella vita socio-economica dell’isola di Pantelleria e nell’immaginario collettivo della comunità locale e dei vari soggetti implicati. Applicando varie metodologie di indagine (interviste, osservazione partecipante, consultazion…

Re-giardinieri e Natura selvaggia. Implicazioni politico-simboliche dello sradicamento, taglio e trasporto in città degli alberi nella Mesopotamia de…

2022

In Sumerian mythological literature, as in coeval Akkadian one, between the end of the 3rd and the beginning of the 2nd millennium, the ruler, foremost among them Gilgameš, on several occasions uproots and/or cuts down trees. These trees should be understood as elements of a wider ‘Wilderness’, with which they share a powerful and ambiguous ontological otherness compared to the city and, more generally, to the land of Sumer. The action of the king on the tree, like that of a farmer or gardener, with the consequent realization of ‘artefacts’, allows, through a cultural organization of the power of the tree, the renewal of the relationship, always subject to crisis, between the human communit…

A weighted distance-based approach with boosted decision trees for label ranking

2023

Label Ranking (LR) is an emerging non-standard supervised classification problem with practical applications in different research fields. The Label Ranking task aims at building preference models that learn to order a finite set of labels based on a set of predictor features. One of the most successful approaches to tackling the LR problem consists of using decision tree ensemble models, such as bagging, random forest, and boosting. However, these approaches, coming from the classical unweighted rank correlation measures, are not sensitive to label importance. Nevertheless, in many settings, failing to predict the ranking position of a highly relevant label should be considered more seriou…

Efficient pruning of multilayer perceptrons using a fuzzy sigmoid activation function

2006

This Letter presents a simple and powerful pruning method for multilayer feed forward neural networks based on the fuzzy sigmoid activation function presented in [E. Soria, J. Martin, G. Camps, A. Serrano, J. Calpe, L. Gomez, A low-complexity fuzzy activation function for artificial neural networks, IEEE Trans. Neural Networks 14(6) (2003) 1576-1579]. Successful performance is obtained in standard function approximation and channel equalization problems. Pruning allows to reduce network complexity considerably, achieving a similar performance to that obtained by unpruned networks.

Unbiased sensitivity analysis and pruning techniques in neural networks for surface ozone modelling

2005

Abstract This paper presents the use of artificial neural networks (ANNs) for surface ozone modelling. Due to the usual non-linear nature of problems in ecology, the use of ANNs has proven to be a common practice in this field. Nevertheless, few efforts have been made to acquire knowledge about the problems by analysing the useful, but often complex, input–output mapping performed by these models. In fact, researchers are not only interested in accurate methods but also in understandable models. In the present paper, we propose a methodology to extract the governing rules of trained ANN which, in turn, yields simplified models by using unbiased sensitivity and pruning techniques. Our propos…

Surviving in a warmer world: environmental and genetic responses

2012

There are numerous reports in the literature of advancing trends in phenophases of plants, insects and birds attributed to rising temperature resulting from human-driven climate warming. One mechanism that enables a population to respond rapidly to changes in the environ- ment is termed phenotypic plasticity. This plasticity grants a degree of flexibility to enable the tim- ing of developmental stages to coincide with resource availability. If, however, environmental con- ditions exceed the plastic limits of an organism, evolutionary change may be necessary in order to ensure continued survival of their populations. We review evidence for phenotypic plasticity and genetic adaptation in phen…

The security of mobile business applications based on mCRM

2020

A development of mobile technologies, and their common use in business, creates new challenges for people dealing with data security in the organization. This paper explores the types and nature of threats to the enterprise that result from the widespread use of business applications on smartphones (e.g. mobile CRM). The analysis has been focused on smartphones and tablets running on the Android operating system. We used STRIDE - a threat modeling technique commonly used to detect vulnerabilities in software security. We propose its modification to better design and implement solutions for the security of mobile devices. We also used the Data Flow Diagram and the Attack Tree concept to anal…

Hopcroft’s Algorithm and Tree-like Automata

2009

In order to analyze some extremal cases of Hopcroft’s algorithm we deepened the relationship between combinatorial properties of circular words and the ex- ecution of the algorithm on cyclic automata associated to such words.In this paper we highlight the notion of word tree and in particular, we char- acterize the word trees for which Hopcroft’s algorithm on the associated tree-like automata has a unique refinement process. Moreover, we show the relationship between the time complexity of the refinements process of the Hopcroft’s algo- rithm on unary cyclic automata and binary tree-like automata. Such a result allows to exhibit a family of tree-like automata representing the worst case of …

Osservazioni sulla entomofauna dell'Avocado ( Persea americana Miller)in Sicilia.

1999

Deregulation of miR-324/KISS1/kisspeptin in early ectopic pregnancy: mechanistic findings with clinical and diagnostic implications

2019

[Abstract] BACKGROUND: Ectopic pregnancy is a life-threatening condition for which novel screening tools that would enable early accurate diagnosis would improve clinical outcomes. Kisspeptins, encoded by KISS1, play an essential role in human reproduction, at least partially by regulating placental function and possibly embryo implantation. Kisspeptin levels are elevated massively in normal pregnancy and reportedly altered in various gestational pathologic diseases. Yet, the pathophysiologic role of KISS1/kisspeptin in ectopic pregnancy has not been investigated previously. OBJECTIVE: The purpose of this study was to evaluate changes of KISS1/kisspeptin levels in ectopic pregnancy and thei…