910,538 research outputs found
Action planning for graph transition systems
Graphs are suitable modeling formalisms for software and hardware systems involving aspects such as communication,
object orientation, concurrency, mobility and distribution. State spaces of such systems can be represented by graph transition systems, which are basically transition systems whose states and transitions represent graphs and graph morphisms. In this paper, we propose the modeling of graph transition systems in PDDL and the application of heuristic search planning for their analysis. We consider different heuristics and present experimental results
Modeling the polycentric transition of cities
Empirical evidence suggest that most urban systems experience a transition
from a monocentric to a polycentric organisation as they grow and expand. We
propose here a stochastic, out-of-equilibrium model of the city which explains
the appearance of subcenters as an effect of traffic congestion. We show that
congestion triggers the unstability of the monocentric regime, and that the
number of subcenters and the total commuting distance within a city scale
sublinearly with its population, predictions which are in agreement with data
gathered for around 9000 US cities between 1994 and 2010.Comment: 11 pages, 12 figure
Context-aware Sequential Recommendation
Since sequential information plays an important role in modeling user
behaviors, various sequential recommendation methods have been proposed.
Methods based on Markov assumption are widely-used, but independently combine
several most recent components. Recently, Recurrent Neural Networks (RNN) based
methods have been successfully applied in several sequential modeling tasks.
However, for real-world applications, these methods have difficulty in modeling
the contextual information, which has been proved to be very important for
behavior modeling. In this paper, we propose a novel model, named Context-Aware
Recurrent Neural Networks (CA-RNN). Instead of using the constant input matrix
and transition matrix in conventional RNN models, CA-RNN employs adaptive
context-specific input matrices and adaptive context-specific transition
matrices. The adaptive context-specific input matrices capture external
situations where user behaviors happen, such as time, location, weather and so
on. And the adaptive context-specific transition matrices capture how lengths
of time intervals between adjacent behaviors in historical sequences affect the
transition of global sequential features. Experimental results show that the
proposed CA-RNN model yields significant improvements over state-of-the-art
sequential recommendation methods and context-aware recommendation methods on
two public datasets, i.e., the Taobao dataset and the Movielens-1M dataset.Comment: IEEE International Conference on Data Mining (ICDM) 2016, to apea
Modeling phase transition and metastable phases
We propose a model that describes phase transition including metastable
phases present in the van der Waals Equation of State (EoS). We introduce a
dynamical system that is able to depict the mass transfer between two phases,
for which equilibrium states are both metastable and stable states, including
mixtures. The dynamical system is then used as a relaxation source term in a
isothermal two-phase model. We use a Finite volume scheme (FV) that treats the
convective part and the source term in a fractional step way. Numerical results
illustrate the ability of the model to capture phase transition and metastable
states
State transition storyboards: A tool for designing the Goldstone solar system radar data acquisition system user interface software
Effective user interface design in software systems is a complex task that takes place without adequate modeling tools. By combining state transition diagrams and the storyboard technique of filmmakers, State Transition Storyboards were developed to provide a detailed modeling technique for the Goldstone Solar System Radar Data Acquisition System human-machine interface. Illustrations are included with a description of the modeling technique
Modeling of turbulence and transition
The first objective is to evaluate current two-equation and second order closure turbulence models using available direct numerical simulations and experiments, and to identify the models which represent the state of the art in turbulence modeling. The second objective is to study the near-wall behavior of turbulence, and to develop reliable models for an engineering calculation of turbulence and transition. The third objective is to develop a two-scale model for compressible turbulence
- …