The role of a specific institution in avoiding a "tragedy of the commons" situation in a common pool-resource environment is studied experimentally. The resource users privately decide their own exploitation level and then, once the group outcome is revealed, can choose to select other individuals for inspection. At a cost, the inspector can view the decision of any individual. If the inspected...

Although natural language is ambiguous, various linguistic and extra-linguistic factors often help determine a preferred reading. In this paper , we show that model generation can be used to model this process in the case of reciprocal statements. The proposed analysis builds on insights from Dalrymple et al. 98 and is shown to provide an integrated, computational account of the interplay betwe...

We evaluated the effectiveness of natural color aerial photography as a tool to improve detection, monitoring, and mapping of sulfur cinquefoil (Potentilla recta L.) infestations. Sulfur cinquefoil is an exotic perennial plant invading interior Pacific Northwest rangelands. Because sulfur cinquefoil produces distinctive pale yellow flowers, we timed aerial photography for early July, when the p...

AIM This study provides regional estimates of forest cover in dry African ecoregions and the changes in forest cover that occurred there between 1990 and 2000, using a systematic sample of medium-resolution satellite imagery which was processed consistently across the continent. LOCATION The study area corresponds to the dry forests and woodlands of Africa between the humid forests and the se...

We approach the problem of adaptively combining the predictions of an ensemble of seasonal climate models as a Multi-task Learning (MTL) problem. Unlike the traditional MTL setting, we only have a single functional task (combining the predictions ensemble members), where we consider multiple forecast periods from the same suite of models as our multiple learning tasks. Even though the same mode...

It is has been well known since Fiengo and Lasnik (1973) and Langendoen (1978) that each other presents a high degree of contextual variability. In a tradition that goes back to Langendoen (1978) and later to Dalrymple et al. (1998), theoreticians have tried to list different truth conditions and to establish a criterion for determining which one holds in which particular context. Along the lin...