1,899 research outputs found
New Periodic Solutions of Singular Hamiltonian Systems with Fixed Energies
By using the variational minimizing method with a special constraint and the
direct variational minimizing method without constraint, we study second order
Hamiltonian systems with a singular potential and
which may have an unbounded potential well, and
prove the existence of non-trivial periodic solutions with a prescribed energy.
Our results can be regarded as some complements of the well-known Theorems of
Benci-Gluck-Ziller-Hayashi and Ambrosetti-Coti Zelati and so on
An Analysis of RMB Internationalization
The main objective of this paper is to analyze the internationalization of RMB. A number of charts and statistics were performed to support china’s efforts on RMB internationalization. Considering the current financial environment, with presence of global imbalance, shortage of safety assets, and financial integration, China should not rush to allow free flow of capital in the near future
Session 13: \u3cem\u3eOn Statistical Estimates of the Inverted Kumaraswamy Distribution Under Adaptive Type-I Progressive Hybrid Censoring\u3c/em\u3e
The probability distribution modeling is investigated via maximum likelihood estimation method based on adaptive type-I progressively hybrid censored samples from the inverted Kumaraswamy distribution. The point estimates of model parameters, reliability, hazard rate and quantile are obtained and confidence intervals are also developed by using asymptotic distribution as well as bootstrap method. Monte Carlo simulation has been performed to evaluate the accuracy of estimations. Finally, a real data set is given for the application illustration
Localization in Unstructured Environments: Towards Autonomous Robots in Forests with Delaunay Triangulation
Autonomous harvesting and transportation is a long-term goal of the forest
industry. One of the main challenges is the accurate localization of both
vehicles and trees in a forest. Forests are unstructured environments where it
is difficult to find a group of significant landmarks for current fast
feature-based place recognition algorithms. This paper proposes a novel
approach where local observations are matched to a general tree map using the
Delaunay triangularization as the representation format. Instead of point cloud
based matching methods, we utilize a topology-based method. First, tree trunk
positions are registered at a prior run done by a forest harvester. Second, the
resulting map is Delaunay triangularized. Third, a local submap of the
autonomous robot is registered, triangularized and matched using triangular
similarity maximization to estimate the position of the robot. We test our
method on a dataset accumulated from a forestry site at Lieksa, Finland. A
total length of 2100\,m of harvester path was recorded by an industrial
harvester with a 3D laser scanner and a geolocation unit fixed to the frame.
Our experiments show a 12\,cm s.t.d. in the location accuracy and with
real-time data processing for speeds not exceeding 0.5\,m/s. The accuracy and
speed limit is realistic during forest operations
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