In this paper, we present a novel indexing data structure called RDHT (Range capable Distributed Hash Table) derived from skip lists and specifically designed for storing and retrieving geographic data from a structured P2P network overlay. We have developed RDHTs as backend for the DART search engine, whose goal is to efficiently answer complex queries based on semantics and geographical conte...

The traditional action-oriented surgical personality, although essential in the service of solving emergent operative dilemmas, may serve as a barrier to introspection. Certainly, challenges of the twenty-first century practice environment, including time constraints, also distract from self-reflection. Without engaging in moments of introspection, surgeons risk not only abandoning dying patien...

A survey is given on two decades of developments in the field, encompassing an increase in computing power by four orders of magnitude. The '4-D approach' integrating expectation-based methods from systems dynamics and control engineering with methods from AI has allowed to create vehicles with unprecedented capabilities in the technical realm: Autonomous road vehicle guidance in public traffic...

Current surgical robotic systems in orthopaedics lack realistic pre-operative simulations and utilize invasive methods to register bone intra-operatively. A multidisciplinary group of researchers is addressing these deeciencies in the context of robotic cementless hip replacement surgery. In this paper we outline our current research progress and a road-map for the short-term future of our rese...

We develop a formal model in which the government provides public goods in different policy fields for its citizens. We start from the basic premise that two office-motivated candidates have differential capabilities in different policy fields, and compete by proposing how to allocate government resources to those fields. The model has a unique equilibrium that differs substantially from the st...

Even sophisticated branch-prediction techniques necessarily suffer some mispredictions, and even relatively small mispredict rates hurt performance substantially in current-generation processors. This suggests the study of multipath execution, in which the processor simultaneously executes code from both the taken and not-taken outcomes of a branch. This paper describes HydraScalar, a simulator...

a famous theorem of schur states that for a group $g$ finiteness of $g/z(g)$‎ ‎implies the finiteness of $g'.$ the converse of schur's theorem is an interesting problem which has been considered by some‎ ‎authors‎. ‎recently‎, ‎podoski and szegedy proved the truth of the converse of schur's theorem for capable groups‎. ‎they also established an explicit bound for the index of the center of such...

in this article we introduce the notion of n-capable groups. it is shown that every group g admits a uniquely determined subgroup (〖z^n)〗^* (g) which is a characteristic subgroup and lies in the n-centre subgroup of the group g. this is the smallest subgroup of g whose factor group is n-capable. moreover, some properties of n-central extension will be studied.