Most software transactional memories employ optimistic concurrency control. A pessimistic semantics, however, is not without its benefits: its programming model is often much simpler to reason about and supports the execution of irreversible operations. We present a programming model that supports both optimistic and pessimistic concurrency control semantics. Our pessimistic transactions, guara...

We formulate a general class of allocation problems called categorized domain allocation problems (CDAPs), where indivisible items from multiple categories are allocated to agents without monetary transfer and each agent gets at least one item per category. We focus on basic CDAPs, where the number of items in each category is equal to the number of agents. We characterize serial dictatorships ...

We propose a novel mode of operation for Amplify-and-Forward relays in which the spectra of the relay input and output signals partially overlap. This partial-duplex relaying mode encompasses half-duplex and full-duplex as particular cases. By viewing the partial-duplex relay as a bandwidthpreserving Linear Periodic Time-Varying system, an analysis of the spectral efficiency in the presence of ...

We report the negative emotional state as pessimistic mood of a case with narcissistic personality disorder during the period of narcissistic decompensation. In addition, we identified the clinical differences between pessimistic mood and depressive disorder. An 28-year-old unmarried woman experienced herself, her life and the external object as futile and disappointing after repeated failure t...

objectives: the present study was aimed to determine the effect of psychological immunization on pessimistic attribution in female students with dyslexia. methods: the study was an experimental one, in which 60 female students with dyslexia were selected randomly from learning disabilities centers in isfahan. subjects  were  assigned to experimental and control groups (15 individuals in each gr...

BACKGROUND Almost no research has examined the impact of explanatory style on social adjustment. We hypothesised that adolescents with a pessimistic style would be less likely to develop and maintain social support networks. METHODS Seven hundred and nineteen students (351 males and 366 females; 2 unknown; M(AGE) = 12.28, SD = .49) completed an anonymous survey in Grades 7 through 10. Explana...