34,957 research outputs found
A New Rational Algorithm for View Updating in Relational Databases
The dynamics of belief and knowledge is one of the major components of any
autonomous system that should be able to incorporate new pieces of information.
In order to apply the rationality result of belief dynamics theory to various
practical problems, it should be generalized in two respects: first it should
allow a certain part of belief to be declared as immutable; and second, the
belief state need not be deductively closed. Such a generalization of belief
dynamics, referred to as base dynamics, is presented in this paper, along with
the concept of a generalized revision algorithm for knowledge bases (Horn or
Horn logic with stratified negation). We show that knowledge base dynamics has
an interesting connection with kernel change via hitting set and abduction. In
this paper, we show how techniques from disjunctive logic programming can be
used for efficient (deductive) database updates. The key idea is to transform
the given database together with the update request into a disjunctive
(datalog) logic program and apply disjunctive techniques (such as minimal model
reasoning) to solve the original update problem. The approach extends and
integrates standard techniques for efficient query answering and integrity
checking. The generation of a hitting set is carried out through a hyper
tableaux calculus and magic set that is focused on the goal of minimality.Comment: arXiv admin note: substantial text overlap with arXiv:1301.515
SUBDIVISION SPECIFIC AMENITIES AND RESIDENTIAL PROPERTY VALUES
A hedonic property value model, derived from a dynamic game theoretic framework, is estimated using data obtained for 211 subdivisions including 4628 building lots in five Maryland counties. Linear Box-Cox estimation results show that variables measuring subdivision specific amenities significantly affect residential property values, and omission of such variables produces biased coefficient estimates.Land Economics/Use,
Subdivision Specific Amenities and Residential Property Values
A hedonic property value model, derived from a dynamic game theoretic framework, is estimated using data obtained for 211 subdivisions including 4628 building lots in five Maryland counties. Linear Box-Cox estimation results show that variables measuring subdivision specific amenities significantly affect residential property values, and omission of such variables produces biased coefficient estimates.Land Economics/Use, Public Economics,
Towards a Domain Specific Language for a Scene Graph based Robotic World Model
Robot world model representations are a vital part of robotic applications.
However, there is no support for such representations in model-driven
engineering tool chains. This work proposes a novel Domain Specific Language
(DSL) for robotic world models that are based on the Robot Scene Graph (RSG)
approach. The RSG-DSL can express (a) application specific scene
configurations, (b) semantic scene structures and (c) inputs and outputs for
the computational entities that are loaded into an instance of a world model.Comment: Presented at DSLRob 2013 (arXiv:cs/1312.5952
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