61,154 research outputs found
Model checking coalitional games in shortage resource scenarios
Verification of multi-agents systems (MAS) has been recently studied taking
into account the need of expressing resource bounds. Several logics for
specifying properties of MAS have been presented in quite a variety of
scenarios with bounded resources. In this paper, we study a different
formalism, called Priced Resource-Bounded Alternating-time Temporal Logic
(PRBATL), whose main novelty consists in moving the notion of resources from a
syntactic level (part of the formula) to a semantic one (part of the model).
This allows us to track the evolution of the resource availability along the
computations and provides us with a formalisms capable to model a number of
real-world scenarios. Two relevant aspects are the notion of global
availability of the resources on the market, that are shared by the agents, and
the notion of price of resources, depending on their availability. In a
previous work of ours, an initial step towards this new formalism was
introduced, along with an EXPTIME algorithm for the model checking problem. In
this paper we better analyze the features of the proposed formalism, also in
comparison with previous approaches. The main technical contribution is the
proof of the EXPTIME-hardness of the the model checking problem for PRBATL,
based on a reduction from the acceptance problem for Linearly-Bounded
Alternating Turing Machines. In particular, since the problem has multiple
parameters, we show two fixed-parameter reductions.Comment: In Proceedings GandALF 2013, arXiv:1307.416
Alternating-time temporal logic with resource bounds
Many problems in AI and multi-agent systems research are most naturally formulated in terms of the abilities of a coalition of agents. There exist several excellent logical tools for reasoning about coalitional ability. However, coalitional ability can be affected by the availability of resources, and there is no straightforward way of reasoning about resource requirements in logics such as Coalition Logic (CL) and Alternating-time Temporal Logic (ATL). In this paper, we describe a logic for reasoning about coalitional ability under resource constraints. We extend ATL with costs of actions and hence of strategies. We give a complete and sound axiomatisation of the resulting logic, Resource-Bounded ATL (RB-ATL), and a model-checking algorithm for it
Alternating-time temporal logic with resource bounds
Many problems in AI and multi-agent systems research are most naturally formulated in terms of the abilities of a coalition of agents. There exist several excellent logical tools for reasoning about coalitional ability. However, coalitional ability can be affected by the availability of resources, and there is no straightforward way of reasoning about resource requirements in logics such as Coalition Logic (CL) and Alternating-time Temporal Logic (ATL). In this article, we describe a logic for reasoning about coalitional ability under resource constraints. We extend ATL with costs of actions and hence of strategies. We give a complete and sound axiomatization of the resulting logic, Resource-Bounded ATL (RB-ATL) and a model-checking algorithm for it
Decentralized Motion Planning with Collision Avoidance for a Team of UAVs under High Level Goals
This paper addresses the motion planning problem for a team of aerial agents
under high level goals. We propose a hybrid control strategy that guarantees
the accomplishment of each agent's local goal specification, which is given as
a temporal logic formula, while guaranteeing inter-agent collision avoidance.
In particular, by defining 3-D spheres that bound the agents' volume, we extend
previous work on decentralized navigation functions and propose control laws
that navigate the agents among predefined regions of interest of the workspace
while avoiding collision with each other. This allows us to abstract the motion
of the agents as finite transition systems and, by employing standard formal
verification techniques, to derive a high-level control algorithm that
satisfies the agents' specifications. Simulation and experimental results with
quadrotors verify the validity of the proposed method.Comment: Submitted to the IEEE International Conference on Robotics and
Automation (ICRA), Singapore, 201
A Two Layered Model for Evolving Web Resources
In this paper the key features of a two-layered model for describing the semantic of dynamical web
resources are introduced.
In the current Semantic Web proposal [Berners-Lee et al., 2001] web resources are classified into static
ontologies which describes the semantic network of their inter-relationships [Kalianpur, 2001][Handschuh &
Staab, 2002] and complex constraints described by logical quantified formula [Boley et al., 2001][McGuinnes &
van Harmelen, 2004][McGuinnes et al., 2004], the basic idea is that software agents can use techniques of
automatic reasoning in order to relate resources and to support sophisticated web application.
On the other hand, web resources are also characterized by their dynamical aspects, which are not adequately
addressed by current web models.
Resources on the web are dynamical since, in the minimal case, they can appear or disappear from the web and
their content is upgraded. In addition, resources can traverse different states, which characterized the resource
life-cycle, each resource state corresponding to different possible uses of the resource. Finally most resources
are timed, i.e. they information they provide make sense only if contextualised with respect to time, and their
validity and accuracy is greatly bounded by time.
Temporal projection and deduction based on dynamical and time constraints of the resources can be made and
exploited by software agents [Hendler, 2001] in order to make previsions about the availability and the state of a
resource, for deciding when consulting the resource itself or in order to deliberately induce a resource state
change for reaching some agent goal, such as in the automated planning framework [Fikes & Nilsson,
1971][Bacchus & Kabanza,1998]
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