DSpace Community:http://hdl.handle.net/2440/2992017-08-29T06:58:42Z2017-08-29T06:58:42ZMoving horizon estimation for Markov jump systemsSun, Q.Lim, C.Shi, P.Liu, F.http://hdl.handle.net/2440/1073112017-08-29T00:40:44Z2016-01-01T00:00:00ZTitle: Moving horizon estimation for Markov jump systems
Author: Sun, Q.; Lim, C.; Shi, P.; Liu, F.
Abstract: Abstract not available2016-01-01T00:00:00ZA prototype of policy defined wireless access networksNguyen, H.Nguyen, D.Pham, T.Hoang, K.Parsonage, E.http://hdl.handle.net/2440/1073102017-08-29T00:38:00Z2017-01-01T00:00:00ZTitle: A prototype of policy defined wireless access networks
Author: Nguyen, H.; Nguyen, D.; Pham, T.; Hoang, K.; Parsonage, E.
Abstract: In the past few years, significant progress has been made in using software defined networking to increase automation, improve network security, simplify network configuration and reduce human effort to establish and maintain the network. There are now a vast number of studies exploring how to utilise policies to achieve the above goals. In this paper, we apply policy defined networking to wireless access network functions. We describe the details of our prototype policy defined networking solution that automatically translates high-level policies into device level implementations. We develop a novel metagraph model that can be used for policy specification, verification and refinement. We show that sophisticated traffic engineering policies can be implemented automatically on commodity hardware using our framework.2017-01-01T00:00:00ZQuasi-periodic paths and a string 2-group model from the free loop groupMurray, M.Roberts, D.Wockel, C.http://hdl.handle.net/2440/1072702017-08-28T00:35:58Z2017-01-01T00:00:00ZTitle: Quasi-periodic paths and a string 2-group model from the free loop group
Author: Murray, M.; Roberts, D.; Wockel, C.
Abstract: We address the question of the existence of a model for the string 2-group as a strict Lie-2-group using the free loop group L-Spin (or more generally LG for compact simple simply-connected Lie groups G). Baez-Crans-Stevenson-Schreiber constructed a model for the string 2-group using a based loop group. This has the deficiency that it does not admit an action of the circle group S^1, which is of crucial importance, for instance in the construction of a (hypothetical) S1-equivariant index of (higher) differential operators. The present paper shows that there are in fact obstructions for constructing a strict model for the string 2-group using LG. We show that a certain infinite-dimensional manifold of smooth paths admits no Lie group structure, and that there are no nontrivial Lie crossed modules analogous to the BCSS model using the universal central extension of the free loop group. Afterwards, we construct the next best thing, namely a coherent model for the string 2-group using the free loop group, with explicit formulas for all structure. This is in particular important for the expected representation theory of the string group that we discuss briefly in the end.2017-01-01T00:00:00ZGeometry of pseudodifferential algebra bundles and fourier integral operatorsMathai, V.Melrose, R.http://hdl.handle.net/2440/1071042017-08-22T00:18:16Z2017-01-01T00:00:00ZTitle: Geometry of pseudodifferential algebra bundles and fourier integral operators
Author: Mathai, V.; Melrose, R.
Abstract: We study the geometry and topology of (filtered) algebra bundles ψZ over a smooth manifold X with typical fiber ψZ (Z;V), the algebra of classical pseudodifferential operators acting on smooth sections of a vector bundle V over the compact manifold Z and of integral order. First, a theorem of Duistermaat and Singer is generalized to the assertion that the group of projective invertible Fourier integral operators PG(Fᶜ(Z;V)) is precisely the automorphism group of the filtered algebra of pseudodifferential operators. We replace some of the arguments in their work by microlocal ones, thereby removing the topological assumption. We define a natural class of connections and B-fields on the principal bundle to which ψZ is associated and obtain a de Rham representative of the Dixmier–Douady class in terms of the outer derivation on the Lie algebra and the residue trace of Guillemin and Wodzicki. The resulting formula only depends on the formal symbol algebra ψZ/ψ⁻∞. Examples of pseudodifferential algebra bundles are given that are not associated to a finite-dimensional fiber bundle over X.2017-01-01T00:00:00Z