2 research outputs found
A normative approach to multi-agent systems for intelligent buildings
Building Management Systems (BMS) are widely adopted in modern buildings around the world in order to
provide high-quality building services, and reduce the running cost of the building. However, most BMS are
functionality-oriented and do not consider user personalization. The aim of this research is to capture and
represent building management rules using organizational semiotics methods. We implement Semantic
Analysis, which determines semantic units in building management and their relationship patterns of
behaviour, and Norm Analysis, which extracts and specifies the norms that establish how and when these
management actions occur. Finally, we propose a multi-agent framework for norm based building
management. This framework contributes to the design domain of intelligent building management system
by defining a set of behaviour patterns, and the norms that govern the real-time behaviour in a building
Quench dynamics in the one-dimensional mass-imbalanced ionic Hubbard model
Using the time-dependent Lanczos method, we study the non-equilibrium
dynamics of the one-dimensional ionic-mass imbalanced Hubbard chain driven by a
quantum quench of the on-site Coulomb interaction, where the system is prepared
in the ground state of the Hamiltonian with a different Hubbard interaction. A
full exact diagonalization is adopted to study the zero temperature phase
diagram in equilibrium, which is shown to be in good agreement with previous
studies using density matrix renormalization group (DMRG). We then study the
non-equilibrium quench dynamics of the spin and charge order parameters by
fixing the initial and final Coulomb interaction while changing the quenching
time protocols. The Lanczos method allows us to reach longer times following
the quench than DMRG. Our study shows that the time evolution of the charge and
spin order parameters strongly depend on the quenching time protocols. In
particular, the effective temperature of the system will decrease monotonically
as the quenching time is increased. Finally, by taking the final Coulomb
interaction strength to be in the strong coupling regime, we find that the
oscillation frequency of the charge order parameter increases monotonically
with the Coulomb interaction. By contrast, the frequency of the spin order
parameter decreases monotonically with increasing Coulomb interaction. We
explain this result using an effective spin model in the strong coupling limit.
Our study suggests strategies to engineer the relaxation behavior of
interacting quantum many-particle systems.Comment: 9 pages, 6 figure