519 resultados para Puzzle unforgeability


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BACKGROUND: The aim was to compare cause-specific mortality, self-rated health (SRH) and risk factors in the French and German part of Switzerland and to discuss to what extent variations between these regions reflect differences between France and Germany. METHODS: Data were used from the general population of German and French Switzerland with 2.8 million individuals aged 45-74 years, contributing 176 782 deaths between 1990 and 2000. Adjusted mortality risks were calculated from the Swiss National Cohort, a longitudinal census-based record linkage study. Results were contrasted with cross-sectional analyses of SRH and risk factors (Swiss Health Survey 1992/3) and with cross-sectional national and international mortality rates for 1980, 1990 and 2000. RESULTS: Despite similar all-cause mortality, there were substantial differences in cause-specific mortality between Swiss regions. Deaths from circulatory disease were more common in German Switzerland, while causes related to alcohol consumption were more prevalent in French Switzerland. Many but not all of the mortality differences between the two regions could be explained by variations in risk factors. Similar patterns were found between Germany and France. CONCLUSION: Characteristic mortality and behavioural differentials between the German- and the French-speaking parts of Switzerland could also be found between Germany and France. However, some of the international variations in mortality were not in line with the Swiss regional comparison nor with differences in risk factors. These could relate to peculiarities in assignment of cause of death. With its cultural diversity, Switzerland offers the opportunity to examine cultural determinants of mortality without bias due to different statistical systems or national health policies.

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Non-monotone incentive structures, which - according to theory - are able to induce optimal behavior, are often regarded as empirically less relevant for labor relationships. We compare the performance of a theoretically optimal non-monotone contract with a monotone one under controlled laboratory conditions. Implementing some features relevant to real-world employment relationships, our paper demonstrates that, in fact, the frequency of income-maximizing decisions made by agents is higher under the monotone contract. Although this observed behavior does not change the superiority of the non-monotone contract for principals, they do not choose this contract type in a significant way. This is what we call the monotonicity puzzle. Detailed investigations of decisions provide a clue for solving the puzzle and a possible explanation for the popularity of monotone contracts.

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In the Burgdorf Museum of Ethnology, a mummy rests in a coffin. According to the inventory book, it was purchased from the Cairo Egyptian museum in 1926. The coffin was now examined by Egyptologists and the mummy was radiocarbon dated and examined by Anthropologists. The aim of the study was to compare the results and to check whether mummy and coffin actually belong together. The skull was examined morphological-anthropologically and by CT as a “blank sample”. Coffin and skull imply that the individual was female. The coffin dates to the Ptolemaic period. Only skull bones are preserved, the ethmoid is damaged. CT images Show resinous substances, bone fragments and brain remnants inside the skull. The ethmoid bone was probably foraminated during the mummification process and thus ended up inside the skull. The individual was mummified between the New Kingdom and the Ptolemaic period. Due to its style, it is most probable that the coffin comes from the Gamhud necropolis. The Burgdorf museum of ethnology inventory book chronicles were largely falsified by the examinations. There is a time gap between coffin and the mummy, there are two possible interpretations: the body was mummified with older linen, or the mummy and the coffin do not belong together. The authors strongly advise further investigations.

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El autor reflexiona sobre la influencia de la economía y los cambios históricos en la concepción de la ciencia. A raíz de la caída de la URSS, Martín Pereda considera que la ciencia y la tecnología deben desarrollarse basándose en la cooperación entre las naciones y los científicos.

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En estas palabras, escritas por José Antonio Martín Pereda, e incluidas en una sesión de homenaje al difunto D. Rafael Portaencasa celebrada por la Real Academia de Ingeniería, el autor recuerda cómo era Portaencasa, en qué situación encontró la Universidad Politécnica de Madrid cuando empezó su mandato como Rector y cuáles fueron sus mayores logros.

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To test whether the structure of a protein is determined in a manner akin to the assembly of a jigsaw puzzle, up to 10 adjacent residues within the core of T4 lysozyme were replaced by methionine. Such variants are active and fold cooperatively with progressively reduced stability. The structure of a seven-methionine variant has been shown, crystallographically, to be similar to wild type and to maintain a well ordered core. The interaction between the core residues is, therefore, not strictly comparable with the precise spatial complementarity of the pieces of a jigsaw puzzle. Rather, a certain amount of give and take in forming the core structure is permitted. A simplified hydrophobic core sequence, imposed without genetic selection or computer-based design, is sufficient to retain native properties in a globular protein.

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CEPS Senior Research Fellow Andrea Renda persuasively shows in this new CEPS Commentary the extent to which the global economy has become heavily reliant on the Internet, but observes that this phenomenon is becoming increasingly insidious. It is efficient, no doubt: but he asks whether it is also secure?

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Competition law seeks to protect competition on the market as a means of enhancing consumer welfare and of ensuring an efficient allocation of resources. In order to be successful, therefore, competition authorities should be adequately equipped and have at their disposal all necessary enforcement tools. However, at the EU level the current enforcement system of competition rules allows only for the imposition of administrative fines by the European Commission to liable undertakings. The main objectives, in turn, of an enforcement policy based on financial penalties are two fold: to impose sanctions on infringing undertakings which reflect the seriousness of the violation, and to ensure that the risk of penalties will deter both the infringing undertakings (often referred to as 'specific deterrence') and other undertakings that may be considering anti-competitive activities from engaging in them (often referred to as 'general deterrence'). In all circumstances, it is important to ensure that pecuniary sanctions imposed on infringing undertakings are proportionate and not excessive. Although pecuniary sanctions against infringing undertakings are a crucial part of the arsenal needed to deter competition law violations, they may not be sufficient. One alternative option in that regard is the strategic use of sanctions against the individuals involved in, or responsible for, the infringements. Sanctions against individuals are documented to focus the minds of directors and employees to comply with competition rules as they themselves, in addition to the undertakings in which they are employed, are at risk of infringements. Individual criminal penalties, including custodial sanctions, have been in fact adopted by almost half of the EU Member States. This is a powerful tool but is also limited in scope and hard to implement in practice mostly due to the high standards of proof required and the political consensus that needs first to be built. Administrative sanctions for individuals, on the other hand, promise to deliver up to a certain extent the same beneficial results as criminal sanctions whilst at the same time their adoption is not likely to meet strong opposition and their implementation in practice can be both efficient and effective. Directors’ disqualification, in particular, provides a strong individual incentive for each member, or prospective member, of the Board as well as other senior executives, to take compliance with competition law seriously. It is a flexible and promising tool that if added to the arsenal of the European Commission could bring balance to the current sanctioning system and that, in turn, would in all likelihood make the enforcement of EU competition rules more effective. Therefore, it is submitted that a competition law regime in order to be effective should be able to deliver policy objectives through a variety of tools, not simply by imposing significant pecuniary sanctions to infringing undertakings. It is also clear that individual sanctions, mostly of an administrative nature, are likely to play an increasingly important role as they focus the minds of those in business who might otherwise be inclined to regard infringing the law as a matter of corporate risk rather than of personal risk. At the EU level, in particular, the adoption of directors’ disqualification promises to deliver more effective compliance and greater overall economic impact.

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The March 2016 EU Summit was yet another attempt to make progress on managing the EU’s migration/refugee crisis. In this post-summit analysis, Janis A. Emmanouilidis argues that the EU-Turkey deal, which foresees a return of migrants from Greece to Turkey and a direct resettlement of Syrians from Turkey to the EU on the grounds of a ‘1-for-1’ scheme, is a key and necessary element in a very complex puzzle trying to stop ‘irregular routes’ of migration. The ultimate success of this agreement is by no means certain, but it has the chance to reduce the number of people arriving at the shores of Europe. However, this would neither settle the crisis nor will it provide an adequate response to those in need of international protection. The ‘humanitarian imperative’ requires that the EU-Turkey deal is complemented by a much more ambitious direct resettlement scheme and other long-term measures as part of a comprehensive plan aiming to balance ‘solidarity and security’ in an effort to sustainably overcome the crisis.