In this article, we show, in the context of partial hedging, that some important relationships about comonotonicity and convex order cannot be translated to countermonotonicity in general because of the possibility of over-hedging. We propose a new notion, called proper hedge, that can effectively avoid over-hedging. Different characterizations of a proper hedge are given, and we show that this...

A model is proposed that allows study of the short-term dynamics of gas exchanges (and heat production) in large open-circuit respiration chambers. The model describes changes in [O2] and [CO2] in the respiration chamber by a series of differential equations based on animal metabolism and physical characteristics of gas exchange. The model structure was similar for O2 and CO2, although model pa...

OBJECTIVES Technical complications are a known hazard in veno-venous extracorporeal membrane oxygenation (vvECMO). Identifying these complications and predictive factors indicating a developing system-exchange was the goal of the study. METHODS Retrospective study on prospectively collected data of technical complications including 265 adult patients (Regensburg ECMO Registry, 2009-2013) with...

A model coupling a three dimensional gas liquid compositional Darcy flow and a one dimensional compositional free gas flow is presented. The coupling conditions at the interface between the gallery and the porous medium account for the molar normal fluxes continuity for each component, the gas liquid thermodynamical equilibrium, the gas pressure continuity and the gas and liquid molar fractions...

The formation and evolution of galactic disks are complex phenomena, where gas and star dynamics are coupled through star formation and the related feedback. The physical processes are so numerous and intricate that numerical models focus, in general, on one or a few of them only. We propose here a numerical model with particular attention to the multiphase nature of the interstellar medium; we...

Assignment Exchanges Paul Milgrom September 6, 2008 Abstract. We analyze assignment exchanges –auction and exchange mechanisms which are tight simplifications of direct Walrasian exchange mechanisms. These simplifications are distinguished by their use of “assignment messages,” which parameterize certain substitutable preferences. The “basic” assignment exchanges respect integer constraints, ge...