In global computing applications the availability of a mechanism for some form of committed choice can be useful, and sometimes necessary. It can conveniently handle, e.g., distributed agreements and negotiations with nested choice points. We propose a linguistic extension of the Join calculus for programming nested commits, called Committed Join (cJoin). It provides primitives for explicit abo...

given a mapping $f:xto x$ we naturally associate to it a monotonic map $gg_f:exp xto exp x$ from the power set of $x$ into itself, thus inducing a generalized topology on $x$. in this paper we investigate some properties of generalized topologies which are defined by such a procedure.

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Recent multiway join algorithms have been shown to be asymptotically faster than any sequence of pairwise joins. Generalized Hypertree Decompositions (GHDs), introduced by Gottlob et al., provide a query plan for utilizing these multiway join algorithms to solve conjunctive queries. It is interesting to extend these new algorithms and query plans to more sophisticated queries, e.g. those includ...

We propose a new class of algorithms that can be used to speed up the execution of multi-way join queries or of queries that involve one or more joins and a group-by. These new evaluation techniques allow to perform several hash-based operations (join and grouping) in one pass without repartitioning intermediate results. These techniques work particularly well for joining hierarchical structure...

BACKGROUND The Accountable Care Organization (ACO) is one of the new models of health care delivery in the U.S. To date, little is known about the characteristics of health care organizations that have joined ACOs. We report on the findings of a survey of primary care clinics, the objective of which was to investigate the opinions of clinic management about participation in ACOs, and the charac...