Abstract The major aim of this contribution is to summarize the theoretical underpinnings most popular rankings, as they have been identified within discourse “world class universities” during first decade 21st century. This period chosen, because thereafter did not elicit further key issues be discussed. Additionally, other dimensions critique will briefly touched upon, notably methodological ...

abstract background: misdiagnosis of the acute appendicitis may increase the rate of negative appendectomies, which involve a huge waste of resources and are sometimes associated with severe complications. furthermore, false negative result of ultrasonography (us) could lead to perforation of appendix. since ultrasonography is still the most common imaging technique used in iranian appendicitis...

we give an algorithm, called t*, for finding the k shortest simplepaths connecting a certain pair of nodes, s and t, in a acyclic digraph.first the nodes of the graph are labeled according to the topologicalordering. then for node i an ordered list of simple s − i paths iscreated. the length of the list is at most k and it is created by usingtournament trees. we prove the correctness of t* and ...