Situ8: browsing and capturing geolocated user-created content

The idea behind Situ8 is a simple one: enable learners to browse and/or create their own content that is geolocated, i.e. somehow related to a physical place in the “real world” (FitzGerald, 2012a). It was inspired by the popular mScape platform (Stenton et al., 2007), that enabled users to attach multimedia content to a map and deploy it through a mobile device, with such media being ‘triggered’ by a user’s geographical position, as measured by GPS (Global Positioning System) technology. However, unlike mScape, Situ8 allows both the creation and delivery of geolocated media i.e. it is a two-process

Bilateral Harmonization of EC and U.S. Agricultural Policies

Agricultural policies in both Europe and the United States provide commodities with an excessively high and distorted pattern of support. The economic interdependencies of the policies give rise to adverse fiscal and economic costs, which are viewed as disharmonies in the existing policy measures both within and between the two regions. Unilateral and simultaneous EC and U.S. policy changes are simulated with an international trade model. They are carried in three steps: (1) grains and feeds, (2) beef and dairy, and (3) sugar. Both cross effects and own effects are examined on typical policy targets. Results suggest that while world prices are sometimes drastically altered, the magnitude of cross effects is small and sometimes ambiguous compared to own effects. Feed livestock linkages are dominant factors in the economic rationale behind the interactions between countries. The case for cooperation in this trade game is, however, supported by the evidence from at least a budget point of view.Agricultural and Food Policy, International Relations/Trade,

Politically Acceptable Trade Compromises Between The EC and The US: A Game Theory Approach

A model is developed to quantify the special status of agriculture in the US and the EC trade negotiations. The role of special interests are measured by a policy goals function (PGF) whose weights are estimated for each special interest group. The analysis searches for mutually acceptable, mutually advantageous trade agreements between the US and the EC using a partial equilibrium world trade model coupled with game theory. Results suggest that it is in the best interest of the US (resp. EC) 'for the EC (resp. US) to liberalize whi1e the other follows the status quo policies of 1986. Mutual gains in PGF values to both countries pursuing "large" liberalizations are unlikely to exist, although "small" liberalizations may give rise to "small" mutual gains. Altering each country's action space, and permitting compensatory payments to the most influencial groups yields trade liberalization, but free trade does not result.game theory, trade liberalization, trade negotiations, International Relations/Trade,

Shadowing effects for continuum and discrete deposition models

We study the dynamical evolution of the deposition interface using both discrete and continuous models for which shadowing effects are important. We explain why continuous and discrete models implying both only shadowing deposition do not give the same result and propose a continuous model which allow to recover the result of the discrete one exhibiting a strong columnar morphology

Determining species tree topologies from clade probabilities under the coalescent

One approach to estimating a species tree from a collection of gene trees is to first estimate probabilities of clades from the gene trees, and then to construct the species tree from the estimated clade probabilities. While a greedy consensus algorithm, which consecutively accepts the most probable clades compatible with previously accepted clades, can be used for this second stage, this method is known to be statistically inconsistent under the multispecies coalescent model. This raises the question of whether it is theoretically possible to reconstruct the species tree from known probabilities of clades on gene trees. We investigate clade probabilities arising from the multispecies coalescent model, with an eye toward identifying features of the species tree. Clades on gene trees with probability greater than 1/3 are shown to reflect clades on the species tree, while those with smaller probabilities may not. Linear invariants of clade probabilities are studied both computationally and theoretically, with certain linear invariants giving insight into the clade structure of the species tree. For species trees with generic edge lengths, these invariants can be used to identify the species tree topology. These theoretical results both confirm that clade probabilities contain full information on the species tree topology and suggest future directions of study for developing statistically consistent inference methods from clade frequencies on gene trees.Comment: 25 pages, 2 figure

A Lyra2 FPGA Core for Lyra2REv2-Based Cryptocurrencies

Lyra2REv2 is a hashing algorithm that consists of a chain of individual hashing algorithms and it is used as a proof-of-work function in several cryptocurrencies that aim to be ASIC-resistant. The most crucial hashing algorithm in the Lyra2REv2 chain is a specific instance of the general Lyra2 algorithm. In this work we present the first FPGA implementation of the aforementioned instance of Lyra2 and we explain how several properties of the algorithm can be exploited in order to optimize the design.Comment: 5 pages, to be presented at the IEEE International Symposium on Circuits and Systems (ISCAS) 201

THE CAP REFORM AND EC-US RELATIONS: THE GATT AS A "CAP" ON THE CAP

Reform of the Common Agricultural Policy has entailed the substitution of new income support instruments for the former price based instruments, mainly in the cash crop sector. Our first point is that the domestic political balance was unable to generate such a large change in policy design, in spite of inefficiencies and inbalances. The pressure of the US has been a major factor in the design of the reform. We argue that trade interests have been crucial to catalyze international collective action in order to countervail domestic pressure groups. The pursuit of an agreement in the GATT is therefore a means to place a cap on the CAP and foster some reform and control over sectors such as sugar and dairy in other countries. We do not foresee the disappearance of sources of tensions between the two countries, as EC animal products become more competitive and as the working of the CAP in the vicinity of world prices will make trade flows sensitive to world macro-economic and agricultural shocks. The Uruguay Round, should not be considered as fully satisfactory, and the long-run objective of further decoupling of payments from production incentives should be pursued.Agricultural and Food Policy,

La ceinture fléchée au carrefour des convoitises des communautés canadiennes-françaises, amérindiennes et métisses du Canada

The historical and current uses of the arrowhead sash and the debate surrounding its origins show that it has been prized by many different groups in Canada. Historically French Canadians, aboriginal peoples, and Métis have claimed the sash as theirs and used it to indicate social standing, particularly in the context of the fur trade. Today, it is part of the cultural legacy of each of these communities. Research into material culture has long maintained that we can understand the significance that groups attach to an object simply by tracing its history. This article takes a different approach by exploring the idea that we can understand the significance specific groups attach to certain objects by studying thet inherent physical characteristics, as indicated by the history of the arrowhead sash. Résumé Depuis le débat sur ses origines jusque dans son utilisation historique et actuelle, la ceinture fléchée a été valorisée par plusieurs communautés différentes. Historiquement, elle a été revendiquée par les Canadiens fiançais, les Autochtones etlesMétis du Canada, qui s'en sont d'abord servi comme marqueur de prestige social, notamment dans le cadre de la traite des fourrures. De nos jours, elle est devenue un objet emblématique du patrimoine respectif de ces communautés. Les recherches en culture matérielle ont longtemps considéré que le repérage du parcours historique d'un objet permettait à lui seul d'étudier le sens qui était donné à l'objet par les collectivités en contact avec lui. Cet article se démarque en explorant la thèse selon laquelle le sens attribué à certains objets par des collectivités peut aussi être appréhendé par l'analyse de leurs caractéristiques matérielles inhérentes, ainsi que l'indique le parcours de la ceinture fléchée