Examples of Coorbit Spaces for Dual Pairs

In this paper we summarize and give examples of a generalization of the coorbit space theory initiated in the 1980's by H.G. Feichtinger and K.H. Gr\"ochenig. Coorbit theory has been a powerful tool in characterizing Banach spaces of distributions with the use of integrable representations of locally compact groups. Examples are a wavelet characterization of the Besov spaces and a characterization of some Bergman spaces by the discrete series representation of $\mathrm{SL}_2(\mathbb{R})$. We present examples of Banach spaces which could not be covered by the previous theory, and we also provide atomic decompositions for an example related to a non-integrable representation

Commuting Toeplitz Operators on Bounded Symmetric Domains and Multiplicity-Free Restrictions of Holomorphic Discrete Series

For any given bounded symmetric domain, we prove the existence of commutative $C^*$-algebras generated by Toeplitz operators acting on any weighted Bergman space. The symbols of the Toeplitz operators that generate such algebras are defined by essentially bounded functions invariant under suitable subgroups of the group of biholomorphisms of the domain. These subgroups include the maximal compact groups of biholomorphisms. We prove the commutativity of the Toeplitz operators by considering the Bergman spaces as the underlying space of the holomorphic discrete series and then applying known multiplicity-free results for restrictions to certain subgroups of the holomorphic discrete series. In the compact case we completely characterize the subgroups that define invariant symbols that yield commuting Toeplitz operators in terms of the multiplicity-free property

Weathering the financial storm: The importance of fundamentals and flexibility

The recent global financial tsunami has had economic consequences that have not been witnessed since the Great Depression. But while some countries suffered a particularly large contraction in economic activity on top of a system-wide banking and currency collapse, others came off relatively lightly. In this paper, we attempt to explain this cross-country variation in post-crisis experience, using a wide variety of pre-crisis explanatory variables in a sample of 46 medium-to-high income countries. We find that domestic macroeconomic imbalances and vulnerabilities were crucial for determining the incidence and severity of the crisis. In particular, we find that the pre-crisis rate of inflation captures factors which are important in explaining the post-crisis experience. Our results also suggest an important role for financial factors. In particular, we find that large banking systems tended to be associated with a deeper and more protracted consumption contraction and a higher risk of a systemic banking or currency crisis. Our results suggest that greater exchange rate flexibility coincided with a smaller and shorter contraction, but at the same time increased the risk of a banking and currency crisis. Countries with exchange rate pegs outside EMU were hit particularly hard, while inflation targeting seemed to mitigate the crisis. Finally, we find some evidence suggesting a role for international real linkages and institutional factors. Our key results are robust to various alterations in the empirical setup and we are able to explain a significant share of the cross-country variation in the depth and duration of the crisis and provide quite sharp predictions of the incidence of banking and currency crises. This suggests that country-specific initial conditions played an important role in determining the economic impact of the crisis and, in particular, that countries with sound fundamentals and flexible economic frameworks were better able to weather the financial storm.

Adopting and adapting a standardised modular survey

Survey design involves a range of different decisions, many of which affect the accuracy of the results. This report discusses some of the key challenges of comparative survey research, and the different approaches to quality in comparative survey projects through the concept of equivalence. This field of research has developed considerably in the past three decades or so, and we now have a greater understanding of how equivalence can be achieved. Global Kids Online (GKO) has developed a modular survey for those who want to study children’s use of digital media. The survey is responsive to local contexts while also allowing cross-national comparisons, and key to its flexibility is the concept of careful adaptation

Liver transplantaion

Neðst á síðunni er hægt að nálgast greinina í heild sinni með því að smella á hlekkinn View/OpenIn recent years, liver transplantation has become the treatment of choice for end-stage liver disease. Chronic viral hepatitis, alcoholic cirrhosis and chronic cholestatic diseases are the most common liver diseases requiring transplantation. Complications of cirrhosis such as variceal bleeding are important indications. Prognostic survival models are also used to determine the optimal timing of transplantation. Pretransplant evaluation is designed to assess the patients general health and the condition of the vital organs. The operation is complicated but most patients recover rapidly. Postoperative complications such as hepatic artery thrombosis may require retransplantation. Following transplantation, the patient is maintained on a regimen of immunosuppressive medications. Acute cellular rejection is common but usually responds to additional immunosuppression. One and five years survival has increased to 80-90% and 65-70% respectively. Recurrent liver disease is a common problem but rarely affects short term survival. Several Icelandic patients have undergone liver transplantation. Indications are similar to other European countries.Lifrarígræðsla hefur á undanförnum árum valdið byltingu í meðferð bráðra og langvinnra lifrarsjúkdóma á lokastigi. Árlega eru nú framkvæmdar þúsundir slíkra aðgerða. Algengustu sjúkdómarnir eru langvinnar lifrarbólgur af völdum veira, skorpulifur af völdum áfengis og langvinnir gallvegasjúkdómar. Fylgikvillar skorpulifrar svo sem blæðingar frá æðagúlum eru algengar ábendingar en við mat á ígræðsluþörf er einnig stuðst við flokkanir og reiknilíkön sem spá fyrir um lifun sjúklinga. Fyrir aðgerð er oft þörf ítarlegra rannsókna til þess að kanna hvort sjúklingurinn þoli aðgerðina. Aðgerðin sjálf er allflókin en sjúklingar ná sér oftast fljótt. Margir fá bráða höfnun en hún er oftast auðveld viðureignar. Veitt er ónæmisbælandi meðferð ævilangt. Lifun sjúklinga sem fengið hafa nýja lifur hefur batnað stöðugt á undanförnum árum. Eins árs lifun er 80-90% og fimm ára lifun 65-70%. Endurkoma sjúkdóms í hina nýju lifur er algengt vandamál en hefur lítil áhrif á lifun fyrstu árin. Nokkrir Íslendingar hafa gengist undir lifrarskipti og eru ábendingar svipaðar og annars staðar í Evrópu