4,331 research outputs found
Optimal Remote State Estimation for Self-Propelled Particle Models
We investigate the design of a remote state estimation system for a
self-propelled particle (SPP). Our framework consists of a sensing unit that
accesses the full state of the SPP and an estimator that is remotely located
from the sensing unit. The sensing unit must pay a cost when it chooses to
transmit information on the state of the SPP to the estimator; and the
estimator computes the best estimate of the state of the SPP based on received
information. In this paper, we provide methods to design transmission policies
and estimation rules for the sensing unit and estimator, respectively, that are
optimal for a given cost functional that combines state estimation distortion
and communication costs. We consider two notions of optimality: joint
optimality and person-by-person optimality. Our main results show the existence
of a jointly optimal solution and describe an iterative procedure to find a
person-by-person optimal solution. In addition, we explain how the remote
estimation scheme can be applied to tracking of animal movements over a costly
communication link. We also provide experimental results to show the
effectiveness of the scheme.Comment: a part of the article was submitted to IEEE Conference on Decision
and Control 201
The holm oak Myrto communis-Quercetum rotundifoliae in Alentejo - Portugal. Post-fire vegetation recovery in two stations (Forest Perimeter of Contenda and Aljustrel)
Abstract
This work, developed in the Southern mainland Portugal, Alentejo, focused in the Forest Perimeter of Contenda (38Âş 01’ N e 7Âş 13’ W) and Aljustrel (37Âş 53’ N e 08Âş 07’ W), where holm oak forests belonging to the Myrto communis-Quercetum rotundifoliae Rivas Goday in Rivas Goday, Borja, Esteve, Galiano, Rigual & Rivas-MartĂnez 1960 have been identified. The Forest Perimeter of Contenda is subjected to the Forest Regime. Here, the field surveys were carried in an area destined to the maintenance of a healthy population of deer for hunting by means of sustainable management activities with minimal impacts on the ecosystem. In Aljustrel, the study area is not significantly disturbed by forestry or agricultural activities, so it has been maintained as a refuge for small game hunting species
The Analysis of Calendar Effects on the Daily Returns of the Portuguese Stock Market: the Weekend and Public Holiday Effects
The Impact of Interest-rate Subsidies on Long-term Household Debt: Evidence from a Large Program
The responsiveness of long-term household debt to the interest rate is a crucial parameter for assessing the effectiveness of public policies aimed at promoting specific types of saving. This paper estimates the effect of a reform of Credito Bonificado, a large program in Portugal that subsidized mortgage interest rates, on long-term household debt. The reform established a ceiling in the price of the house that could be financed through the program, and provides plausibly exogenous variation in incentives. Using a unique dataset of matched household survey data and administrative records of debt, we document a large decrease in the probability of signing a new loan after the removal of the subsidy.
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