55,975 research outputs found
Diffractive Phenomena at Tevatron
Preliminary results from the D0 experiment on jet production with rapidity
gaps in collisions are presented. A class of dijet events with a
forward rapidity gap is observed at center-of-mass energies = 1800
GeV and 630 GeV. The number of events with rapidity gaps at both center-of-mass
energies is significantly greater than the expectation from multiplicity
fluctuations and is consistent with a hard single diffractive process. A class
of events with two forward gaps and central dijets are also observed at 1800
GeV. This topology is consistent with hard double pomeron exchange. We also
present proposed plans for extending these analysis into Run II through the use
of a forward proton detector.Comment: plain tex, 5 pages, 2 figure
Modelling of building interiors with mobile phone sensor data
Creating as-built plans of building interiors is a challenging task. In this paper we present a semi-automatic modelling system for creating residential building interior plans and their integration with existing map data to produce building models. Taking a set of imprecise measurements made with an interactive mobile phone room mapping application, the system performs spatial adjustments in accordance with soft and hard constraints imposed on the building plan geometry. The approach uses an optimisation model that exploits a high accuracy building outline, such as can be found in topographic map data, and the building topology to improve the quality of interior measurements and generate a standardised output. We test our system on building plans of five residential homes. Our evaluation shows that the approach enables construction of accurate interior plans from imprecise measurements. The experiments report an average accuracy of 0.24 m, close to the 0.20 m recommended by the CityGML LoD4 specificatio
Data driven estimation of building interior plans
This work investigates constructing plans of building interiors using learned building measurements. In particular, we address the problem of accurately estimating dimensions of rooms when measurements of the interior space have not been captured. Our approach focuses on learning the geometry, orientation and occurrence of rooms from a corpus of real-world building plan data to form a predictive model. The trained predictive model may then be queried to generate estimates of room dimensions and orientations. These estimates are then integrated with the overall building footprint and iteratively improved using a two-stage optimisation process to form complete interior plans.
The approach is presented as a semi-automatic method for constructing plans which can cope with a limited set of known information and constructs likely representations of building plans through modelling of soft and hard constraints. We evaluate the method in the context of estimating residential house plans and demonstrate that predictions can effectively be used for constructing plans given limited prior knowledge about the types of rooms and their topology
Topology-Guided Path Integral Approach for Stochastic Optimal Control in Cluttered Environment
This paper addresses planning and control of robot motion under uncertainty
that is formulated as a continuous-time, continuous-space stochastic optimal
control problem, by developing a topology-guided path integral control method.
The path integral control framework, which forms the backbone of the proposed
method, re-writes the Hamilton-Jacobi-Bellman equation as a statistical
inference problem; the resulting inference problem is solved by a sampling
procedure that computes the distribution of controlled trajectories around the
trajectory by the passive dynamics. For motion control of robots in a highly
cluttered environment, however, this sampling can easily be trapped in a local
minimum unless the sample size is very large, since the global optimality of
local minima depends on the degree of uncertainty. Thus, a homology-embedded
sampling-based planner that identifies many (potentially) local-minimum
trajectories in different homology classes is developed to aid the sampling
process. In combination with a receding-horizon fashion of the optimal control
the proposed method produces a dynamically feasible and collision-free motion
plans without being trapped in a local minimum. Numerical examples on a
synthetic toy problem and on quadrotor control in a complex obstacle field
demonstrate the validity of the proposed method.Comment: arXiv admin note: text overlap with arXiv:1510.0534
Toward the minimal realization of a light composite Higgs
Work in progress is reported on a particularly interesting gauge theory with
a fermion doublet in the two-index symmetric (sextet) representation of the
SU(3) color gauge group. Extending previous studies we outline our strategy as
we investigate Goldstone dynamics and Electroweak scale setting from chiral
symmetry breaking ( SB), test the GMOR relation from the spectrum of the
Dirac operator and the related chiral condensate, begin to develop and test
mixed action based improved analysis of SB with new run plans at fixed
topology to cross over from the p-regime to the epsilon-regime of SB,
continue to pursue the light scalar and its relation to the dilaton,
and probe the scale-dependent running coupling from the perturbative UV scale
to the scale of chiral symmetry breaking. Our observations suggest that the
model is very close to the conformal window and a light composite scalar,
perhaps the Higgs impostor with or without dilaton-like interpretation, appears
to emerge with quantum numbers. The lightest baryon of the model on
the 3 TeV scale has intriguing implications.Comment: 14 pages, 7 figures, The 32nd International Symposium on Lattice
Field Theory,23-28 June, 2014 Columbia University, New York, NY, US
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