258 research outputs found

    Linking Beliefs to Willingness to Compete

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    URL des Documents de travail : http://ces.univ-paris1.fr/cesdp/cesdp2012.htmlDocuments de travail du Centre d'Economie de la Sorbonne 2012.75 - ISSN : 1955-611XMen are known to have a higher taste for competition than women. This paper presents an experiment that analyses the different determinants of the choice to enter a competition : beliefs and the competition level. As far as entry in the competition is concerned, low-performing subjects adapt their decision entry to the level of the competition, whereas high-performers do no. However, the behaviors leading to these results are quite different for men and women : women mainly react to the information on their own performance while men seem to respond more to their beliefs concerning the level of the competition they will be evolving in. Finally, both men and women deviate from their bayesian beliefs and become too pessimistic (optimistic) after a negative (positive) feedback.Les travaux rĂ©cents montrent que les hommes ont un goĂ»t pour la compĂ©tition plus prononcĂ© que les femmes. Cet article prĂ©sente un protocole expĂ©rimental mettant en Ă©vidence les diffĂ©rents dĂ©terminants du choix d'entrer en compĂ©tition : les croyances et le niveau de la compĂ©tition. Nous trouvons que les sujets peu performants s'adaptent au niveau de la compĂ©tition, ce qui n'est pas le cas des sujets performants. Notre expĂ©rience permet aussi de montrer que l'information n'est pas traitĂ©e de la mĂȘme façon par les hommes et par les femmes : les femmes donnent plus de poids Ă  l'information reçue, tandis que les hommes tiennent plus compte du niveau de la compĂ©tition auquel ils vont faire face. De maniĂšre gĂ©nĂ©rale, les hommes et les femmes dĂ©vient des croyances bayĂ©siennes et l'information sur leur performance les rend trop pessimistes si cette information est nĂ©gative (trop optimiste dans le cas contraire)

    A life cycle based method to minimise environmental impact of dairy production through product sequencing

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    The trend of increasing the number of dairy products for sale affects their environmental impact in a life cycle perspective. During dairy processing, the production schedule is affected by more frequent product changes, hence also cleaning operations. This causes more milk waste, use of cleaning agents and water. The amount of milk waste depends on the product change technique used, which is determined by the characteristics of the product. A method was designed to calculate the sequence, which, for a given set of yoghurt products, minimises milk waste. A heuristic method, based on the strive to minimise production waste combined with production rules, was worked out. To determine whether the heuristic solution gives the best possible sequence from an environmental perspective, an optimisation was also made. The analytical method used for optimisation was able to handle 21 products and verified the heuristic method for a waste minimised sequence up to that level. It is also highly probable that for sequences including a greater number of items waste can be minimised with the same heuristic method. A successful demonstration of the possibility to make a more complete environmental assessment was fulfilled by connecting the sequencing model to conventional life cycle assessment methodology

    How to make Dupire's local volatility work with jumps

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    There are several (mathematical) reasons why Dupire's formula fails in the non-diffusion setting. And yet, in practice, ad-hoc preconditioning of the option data works reasonably well. In this note we attempt to explain why. In particular, we propose a regularization procedure of the option data so that Dupire's local vol diffusion process recreates the correct option prices, even in manifest presence of jumps

    Smoking Related Diseases: The Central Role of Monoamine Oxidase

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    Smoking is a major risk factor of morbidity and mortality. It is well established that monoamine oxidase (MAO) activity is decreased in smokers. Serotonin (5-HT), a major substrate for MAO that circulates as a reserve pool stored in platelets, is a marker of platelet activation. We recently reported that smoking durably modifies the platelet 5-HT/MAO system by inducing a demethylation of the MAO gene promoter resulting in high MAO protein concentration persisting more than ten years after quitting smoking. The present data enlarges the results to another MAO substrate, norepinephrine (NE), further confirming the central role of MAO in tobacco use-induced diseases. Thus, MAO could be a readily accessible and helpful marker in the risk evaluation of smoking-related diseases, from cardiovascular and pulmonary diseases to depression, anxiety and cancer. The present review implements the new finding of epigenetic regulation of MAO and suggests that smoking-induced MAO demethylation can be considered as a hallmark of smoking-related cancers similarly to other aberrant DNA methylations

    The Usefulness of an Actor’s Perspective in LCA

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    This paper is an argumentation for adding an actor’s perspective to lifecycle assessment (LCA). The need for this perspective stems from a criticism about the usefulness of LCA interpretation methods comparing the relative contribution of life-cycle phases of a product. Our argumentation is based on four previously published studies providing practical examples of how value chain actors’ influence may be considered in an LCA and the benefit of doing so. Manufacturing sector examples show how one company's influence can be illustrated in results and how it may relate all relevant emissions to its own processes. The food sector study shows how to assess several value chain actors’ individual improvement potential. The final example, taken from building sector, explore how to consider the fact that actors in one part of the value chain can influence other actors to improve
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