Search results for "Frontier"

Frontières externes, frontières internes. Implications politiques et sociales de l’institution des milices territoriales dans le royaumes de Naples e…

2011

L'articolo ha quale oggetto l'analisi della definizione delle frontiere in area mediterranea, con particolare riferimento ai regni di Napoli e Sicilia, e lo studio delle relative implicazioni sociali ed economiche nel corso del XVI secolo.

Sicily: frontier-island in the modern Mediterranean

2010

Al-Tābisī and His Descendants: The Failed Integration of a Military Andalusi Family into the Christian Society of the Kingdom of Valencia (1238–1283)

2018

Although the life of al-Tābisi is shrouded in mystery, the evidence suggests that he was the descendant of one of the Andalusi military lineages that abandoned the Lower Ebro after the Catalonian occupation in the mid-twelfth century. During the Conquest of Valencia, al-Tābisi collaborated with the King of Aragon (probably as a member of the entourage of the sayyid Abū Zayd), with whom he participated in the siege of the city of Valencia (1238) and the subsequent war against al-Azraq (1258). His services were rewarded with land in the Huerta of Valencia, as well as several castles in the southern frontier of the kingdom. His descendants converted to Christianity, preserving references to th…

Production of written French skills by first generation immigrants in working age

2013

This paper aims to identify factors explaining the level of proficiency in written French by immigrants in working age, knowing that few research has been conducted in France on this issue. The originality of this paper is the stochastic production frontier model to explain the scores in written French and the productive performance of immigrants (considered as producers of their own skills). The main results show that mother tongue, age at immigration, social life and mother's diploma are elements which influence the effectiveness of this production. They play a crucial role in the ability of immigrants to use effectively their duration of stay in France and their length of education, cons…

Consolidated challenge to social demand for resilient platforms : Lessons from Uber's global expansion

2017

Many in the industry see the ride-sharing company Uber as the significant advancement through information and communication technology (ICT) particularly of the digital service platform and sharing economy. Uber has been exploring the new frontier of the ICT-driven disruptive business model (IDBM) and succeeded in its global expansion to over 479 cities in more than 75 countries worldwide in June of 2016. Such rapid expansion provides constructive insights regarding the significance of IDBM, not only in transportation but also in almost all other business fields. While at the same time Uber's legal battles in some cities around the world raise a serious question regarding the rationale of I…

Soft Computing Techniques for Portfolio Selection: Combining SRI with Mean-Variance Goals

2014

A fuzzy portfolio selection model is presented incorporating a socially responsible goal without discarding a priori financially good portfolios or weakening a priori the financial goals. Hence, the optimal portfolios it provides could be either efficient from the strictly financial point of view or non-efficient if leaving the efficient frontier substantially improves the degree of social responsibility. The model can be used to direct heuristic procedures in order to select a reduced number of various alternatives from which the investor can directly make a final decision.

Calibration of optimal execution of financial transactions in the presence of transient market impact

2012

Trading large volumes of a financial asset in order driven markets requires the use of algorithmic execution dividing the volume in many transactions in order to minimize costs due to market impact. A proper design of an optimal execution strategy strongly depends on a careful modeling of market impact, i.e. how the price reacts to trades. In this paper we consider a recently introduced market impact model (Bouchaud et al., 2004), which has the property of describing both the volume and the temporal dependence of price change due to trading. We show how this model can be used to describe price impact also in aggregated trade time or in real time. We then solve analytically and calibrate wit…

Innovation efficiency: a bibliometric review and future research agenda

2021

Innovation efficiency has become a phenomenon of global interest. This paper reviews 165 articles from academic journals of innovation efficiency, applies the data-driven text mining approach to ma...

Agricultural and Biotechnology Patents as an Adaptation Strategy to Climate Change: A Regional Analysis of European Farmer’s Efficiency

2022

This chapter analyses the effect of innovation encouraged by climate change challenges on European farmers’ technical efficiency. Using the stochastic frontier approach, we estimate the impact of agri-cultural patents on farmers’ technical efficiency by taking into account both unobservable heterogeneity and heteroscedasticity in the inefficiency term. Our findings suggest that European farmers remain quite far from the maximum frontier and irrespective of the country in which they reside; farmers who innovate are more efficient than those who do not. Thus, the inefficiency of agricultural agents in the European context leaves space for policies that incentivise firms to adopt climate chang…

Does cutting back the public sector improve efficiency? Some evidence from 15 European countries

2013

The successful development of the welfare state that transpired for three decades after WWII in the developed countries, came to a halt around the end of the 1980s. Since then, the number of articles and books dedicated to the crisis of the welfare state has increased. We can now assert that at the turn of the century, almost all industrialized countries had cut at least “some” entitlements in their welfare program along with other expenditure items, and the trend continued in the first decade of this century. To defend the cuts and possibly to justify continuing cuts, several economic reasons, both theoretical and empirical, have been highlighted. From mention of Baumol’s disease to the fi…