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Topological changes
"... l algo ack s creti deco and s disc g fast ting update of the meshless discretization, and allows for an easy implementation. As a result, our algorithm is scalable, versatile, and suitable for a large range of applications, from comaphic irtua wing medi ling b erati forces, deformations, and crack ..."
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initiation and propagation. In this paper, we are concerned with the geometric and topological aspect of simulating cutting and fracture, and to that respect, they are analogous operations. However, stability of the simulation strongly depends on the quality of the mesh, which tends to be preserved
Topology Control of Multihop Wireless Networks using Transmit Power Adjustment
, 2000
"... We consider the problem of adjusting the transmit powers of nodes in a multihop wireless network (also called an ad hoc network) to create a desired topology. We formulate it as a constrained optimization problem with two constraints connectivity and biconnectivity, and one optimization objective ..."
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Cited by 687 (3 self)
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 maximum power used. We present two centralized algorithms for use in static networks, and prove their optimality. For mobile networks, we present two distributed heuristics that adaptively adjust node transmit powers in response to topological changes and attempt to maintain a connected topology using
Topology Change and Causal Continuity
, 1997
"... The result that, for a scalar quantum field propagating on a “trousers” topology in 1 + 1 dimensions, the crotch singularity is a source for an infinite burst of energy has been used to argue against the occurrence of topology change in quantum gravity. We draw attention to a conjecture due to Sorki ..."
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Cited by 3 (0 self)
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The result that, for a scalar quantum field propagating on a “trousers” topology in 1 + 1 dimensions, the crotch singularity is a source for an infinite burst of energy has been used to argue against the occurrence of topology change in quantum gravity. We draw attention to a conjecture due
Topology change and context dependence
, 1999
"... The nonclassical features of quantum mechanics are reproduced using models constructed with a classical theory general relativity. The inability to define complete initial data consistently and independently of future measurements, nonlocality, and the nonBoolean logical structure are reproduced ..."
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are reproduced by these examples. The key feature of the models is the role of topology change. It is the breakdown of causal structure associated with topology change that leads to the apparently nonclassical behaviour. For geons, topology change is required to describe the interaction of particles
Topology change in quantum gravity
, 2002
"... A particular approach to topology change in quantum gravity is reviewed, showing that several aspects of Stephen’s work are intertwined with it in an essential way. Speculations are made on possible implications for the causal set approach to quantum gravity. ..."
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Cited by 1 (0 self)
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A particular approach to topology change in quantum gravity is reviewed, showing that several aspects of Stephen’s work are intertwined with it in an essential way. Speculations are made on possible implications for the causal set approach to quantum gravity.
Topology Change of Black Holes
, 704
"... Abstract. The topological structure of the event horizon has been considered in terms of the Morse theory. The elementary process of topology changes can be understood as a handle attachment. It has been found that there are certain constraints on the black hole topology changes: (i) There are n kin ..."
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Abstract. The topological structure of the event horizon has been considered in terms of the Morse theory. The elementary process of topology changes can be understood as a handle attachment. It has been found that there are certain constraints on the black hole topology changes: (i) There are n
Topological changes in the apparent . . .
"... We analyse the topological changes occuring in the apparent contour of a collection of disjoint convex sets from a moving viewpoint, and relate them to the classical visual event surfaces, swept by tritangent rays and limiting bitangent rays. Specifically, we show that all topological changes occur ..."
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We analyse the topological changes occuring in the apparent contour of a collection of disjoint convex sets from a moving viewpoint, and relate them to the classical visual event surfaces, swept by tritangent rays and limiting bitangent rays. Specifically, we show that all topological changes occur
Topology change from . . .
, 2008
"... We consider Narain Tduality on a nontrivially fibered ntorus bundle in the presence of a topologically nontrivial NS H flux. The action of the duality group on the topology and H flux of the corresponding type II and heterotic string backgrounds is determined. The topology change is specialized to ..."
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Cited by 19 (5 self)
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We consider Narain Tduality on a nontrivially fibered ntorus bundle in the presence of a topologically nontrivial NS H flux. The action of the duality group on the topology and H flux of the corresponding type II and heterotic string backgrounds is determined. The topology change is specialized
A Highly Adaptive Distributed Routing Algorithm for Mobile Wireless Networks
, 1997
"... We present a new distributed routing protocol for mobile, multihop, wireless networks. The protocol is one of a family of protocols which we term "link reversal" algorithms. The protocol's reaction is structured as a temporallyordered sequence of diffusing computations; each computat ..."
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Cited by 1096 (6 self)
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;temporal order" of topological change events which is used to structure (or order) the algorithm's reaction to topological changes. We refer to the protocol as the TemporallyOrdered Routing Algorithm (TORA).
Mobility increases the capacity of adhoc wireless networks
 IEEE/ACM TRANSACTIONS ON NETWORKING
, 2002
"... The capacity of adhoc wireless networks is constrained by the mutual interference of concurrent transmissions between nodes. We study a model of an adhoc network where n nodes communicate in random sourcedestination pairs. These nodes are assumed to be mobile. We examine the persession throughpu ..."
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Cited by 1218 (5 self)
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session throughput for applications with loose delay constraints, such that the topology changes over the timescale of packet delivery. Under this assumption, the peruser throughput can increase dramatically when nodes are mobile rather than fixed. This improvement can be achieved by exploiting node mobility as a
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