301,214 research outputs found
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MAS platforms as an enabler of enterprise mobilisation: The state of the art
One of the main application areas for multi-agent systems technology is enterprise mobilization, wherein the main business process actors are nomadic workers. An agent's autonomy, sociality and intelligence are highly prized features when it comes to supporting those mobile workers who are geographically isolated from the main knowledge source (i.e. the corporate Intranet) and are frequently moving from one location to another. Based on experience gained from two field trials of applications (built using for multi-agent systems technology and running on lightweight handheld devices) that support mobile business processes for telecommunications service provisioning and maintenance, this paper proposes desirable metrics for any multi-agent systems platform intended for enterprise mobilisation use. These metrics are then used to compare a number of existing multi-agent systems platforms, and based on the results, this paper identifies some areas for improvement
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TeamWorker: An agent-based support system for mobile task execution
Traditional workflow management systems are considered insufficiently flexible to support autonomous job management via close team working. This paper proposes a multi-agent system approach to enhancing existing workflow management systems to enable team-based job management in the field of telecommunications service provision and maintenance. This paper adopts a component-based approach and explains how applications can be developed by customising the generic components provided by a multi-agent systems framework
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Realising Team-Working in the Field: An Agent-based Approach
Multi-agent systems technology is applied to enable co-operation between mobile workers in the field, minimising user intervention and increasing reachability. A component-based approach is taken to simplify the management of deployed co-operation services. A Personal Assistant running on a mobile device is introduced to show how an intelligent and autonomous agent can increase the utility of users during workforce co-operation processes. Finally, a real world trial of the technology by network installation and maintenance engineers in the UK is described. Some technical issues revealed during the trial are discussed, as is the impact of the technology on the business process
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mPower: A component-based development framework for multi-agent systems to support business processes
One of the obstacles preventing the widespread adoption of multi-agent systems in industry is the difficulty of implementing heterogeneous interactions among participating agents via asynchronous messages. This difficulty arises from the need to understand how to combine elements of various content languages, ontologies, and interaction protocols in order to construct meaningful and appropriate messages. In this paper mPower, a component-based layered framework for easing the development of multi-agent systems, is described, and the facility for customising the components for reuse in similar domains is explained. The framework builds on the JADE-LEAP platform, which provides a homogeneous layer over diverse operating systems and hardware devices, and allows ubiquitous deployment of applications built on multi-agent systems both in wired and wireless environments. The use of the framework to develop mPowermobile , a multi-agent system to support mobile workforces, is reported
Patterns of Striped order in the Classical Lattice Coulomb Gas
We obtain via Monte Carlo simulations the low temperature charge
configurations in the lattice Coulomb gas on square lattices for charge filling
ratio in the range . We find a simple regularity in the low
temperature charge configurations which consist of a suitable periodic
combination of a few basic striped patterns characterized by the existence of
partially filled diagonal channels. In general there exist two separate
transitions where the lower temperature transition () corresponds to the
freezing of charges within the partially filled channels. is found to be
sensitively dependent on through the charge number density within the channels.Comment: 4 pages, 8 figure
Collapse transition of a square-lattice polymer with next nearest-neighbor interaction
We study the collapse transition of a polymer on a square lattice with both
nearest-neighbor and next nearest-neighbor interactions, by calculating the
exact partition function zeros up to chain length 36. The transition behavior
is much more pronounced than that of the model with nearest-neighbor
interactions only. The crossover exponent and the transition temperature are
estimated from the scaling behavior of the first zeros with increasing chain
length. The results suggest that the model is of the same universality class as
the usual theta point described by the model with only nearest-neighbor
interaction.Comment: 14 pages, 5 figure
One-Particle Anomalous Excitations of Gutzwiller Projected BCS Superconductors and Bogoliubov Quasi-Particle Characteristics
Low-lying one-particle anomalous excitations are studied for Gutzwiller
projected strongly correlated BCS states. It is found that the one-particle
anomalous excitations are highly coherent, and the numerically calculated
spectrum can be reproduced quantitatively by a renormalized BCS theory, thus
strongly indicating that the nature of low-lying excitations described by the
projected BCS states is essentially understood within a renormalized Bogoliubov
quasi-particle picture. This finding resembles a well known fact that a
Gutzwiller projected Fermi gas is a Fermi liquid. The present results are
consistent with numerically exact calculations of the two-dimensional t-J model
as well as recent photoemission experiments on high-T_{\rm C} cuprate
superconductors.Comment: 5 pages, 3 figures, accepted for publication in Phys. Rev. B 74,
180504(R) (2006
Superconducting energy gap in MgCNi3 single crystals: Point-contact spectroscopy and specific-heat measurements
Specific heat has been measured down to 600 mK and up to 8 Tesla by the
highly sensitive AC microcalorimetry on the MgCNi3 single crystals with Tc ~ 7
K. Exponential decay of the electronic specific heat at low temperatures proved
that a superconducting energy gap is fully open on the whole Fermi surface, in
agreement with our previous magnetic penetration depth measurements on the same
crystals. The specific-heat data analysis shows consistently the strong
coupling strength 2D/kTc ~ 4. This scenario is supported by the direct gap
measurements via the point-contact spectroscopy. Moreover, the spectroscopy
measurements show a decrease in the critical temperature at the sample surface
accounting for the observed differences of the superfluid density deduced from
the measurements by different techniques
Microscopic Motion of Particles Flowing through a Porous Medium
We use Stokesian Dynamics simulations to study the microscopic motion of
particles suspended in fluids passing through porous media. We construct model
porous media with fixed spherical particles, and allow mobile ones to move
through this fixed bed under the action of an ambient velocity field. We first
consider the pore scale motion of individual suspended particles at pore
junctions. The relative particle flux into different possible directions
exiting from a single pore, for two and three dimensional model porous media is
found to approximately equal the corresponding fractional channel width or
area. Next we consider the waiting time distribution for particles which are
delayed in a junction, due to a stagnation point caused by a flow bifurcation.
The waiting times are found to be controlled by two-particle interactions, and
the distributions take the same form in model porous media as in two-particle
systems. A simple theoretical estimate of the waiting time is consistent with
the simulations. We also find that perturbing such a slow-moving particle by
another nearby one leads to rather complicated behavior. We study the stability
of geometrically trapped particles. For simple model traps, we find that
particles passing nearby can ``relaunch'' the trapped particle through its
hydrodynamic interaction, although the conditions for relaunching depend
sensitively on the details of the trap and its surroundings.Comment: 16 pages, 19 figure
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