Knowledge sharing behavior in virtual communities has long been an important area of research. Prior related research has primarily focused on relational virtual community (RVC) where knowledge sharing is regarded as a social exchange behavior, heavily depending on the social concerns such as reciprocity, identification and norms. The objective of our study is to investigate knowledge contribut...

This special issue of Computing and Visualization in Science contains selected papers from the 2014 European Multigrid conference (EMG 2014), which took place in Leuven, Belgium, from 9 to 12 September, 2014. European Multigrid (EMG) is a series of conferences on the theme of multigrid methods and related fields. EMG is one of the most important conference series on this topic worldwide. Previo...

The timing and the frequency of punishment are critical elements in law enforcement. Previous studies suggest the superiority of immediate punishment schemes over delayed punishment, as well as the importance of frequent punishment. Yet law enforcement schemes which utilize both frequent and immediate punishment may be cost prohibitive in real settings. In this work, we propose the “bad lottery...

This paper employs a multivariate Bayesian time-varying coetficients (TVC) approach to model and forecast exchange rate data. It is shown that, if used as a data-generating mechanism, a TVC model induces nonlinearities in the conditional moments and leptokurtosis in the unconditional distribution of the series. It is also shown that leptokurtic behavior disappears under time aggregation. As a f...

Increased levels of stress are more frequent in the hearing-impaired population than in normal-hearing people. Because of the high frequency of stress in the hearing-impaired population and the ability of music to reduce stress, Widex has included a feature in the high end mind440 hearing aid which allows users to listen to a choice of diff erent music styles. Generally researchers agree that m...

Under in vitro conditions spleen cells from nonirradiated F(1) hybrids, in which a (graft-vs.-host) (GVH) reaction had been induced with lymphoid cells of parental origin, lysed nonspecifically target cells, i.e., cells syngeneic or allogeneic to the parental genotypes. Furthermore, tumor cells exposed in vitro to spleen cells of F(1) hybrid mice undergoing GVH reaction had markedly decreased a...

Technically simple proofs are given of the HVZ theorem on the bottom of the essential spectrum of multiparticle systems and of Combes' result on completeness below the lowest three body threshold. The first proof is a variant of a proof of Enss and a decendent of Zhislin's original proof. Finally, we apply our methods to the bound state spectrum.

This paper extends the political agency approach to an environment in which voting may be divided between informed and instrumental, informed and ‘expressive’ and uninformed due to ‘rational irrationality’. It constructs a model where politicians may be good, bad or populist. Initially the existence of only good and populist politicians is assumed and the incentives for good politicians to pool...