707 research outputs found
Analytical Studies on a Modified Nagel-Schreckenberg Model with the Fukui-Ishibashi Acceleration Rule
We propose and study a one-dimensional traffic flow cellular automaton model
of high-speed vehicles with the Fukui-Ishibashi-type (FI) acceleration rule for
all cars, and the Nagel-Schreckenberg-type (NS) stochastic delay mechanism. By
using the car-oriented mean field theory, we obtain analytically the
fundamental diagrams of the average speed and vehicle flux depending on the
vehicle density and stochastic delay probability. Our theoretical results,
which may contribute to the exact analytical theory of the NS model, are in
excellent agreement with numerical simulations.Comment: 3 pages previous; now 4 pages 2 eps figure
Integrating static and dynamic information for routing traffic
The efficiency of traffic routing on complex networks can be reflected by two
key measurements i.e. the system capacity and the average data packets travel
time. In this paper, we propose a mixing routing strategy by integrating local
static and dynamic information for enhancing the efficiency of traffic on
scale-free networks. The strategy is governed by a single parameter. Simulation
results show that there exists a optimal parameter value by considering both
maximizing the network capacity and reducing the packet travel time. Comparing
with the strategy by adopting exclusive local static information, the new
strategy shows its advantages in improving the efficiency of the system. The
detailed analysis of the mixing strategy is provided. This work suggests that
how to effectively utilize the larger degree nodes plays the key role in the
scale-free traffic systems.Comment: 5 pages, 5 figure
Vortex-Antivortex Lattices in a Holographic Superconductor
We employ the Einstein-Abelian-Higgs theory to investigate the structure of
vortex-antivortex lattices within a superconductor driven by spatial periodic
magnetic fields. By adjusting the parameters of the external magnetic field,
including the period () and the amplitude (), various
distinct vortex states emerge. These states encompass the Wigner
crystallization state, the vortex cluster state, and the suppressed state.
Additionally, we present a comprehensive phase diagram to demarcate the
specific regions where these structures emerge, contributing to our
understanding of superconductivity in complex magnetic environments
Giant vortex in a fast rotating holographic superfluid
In a holographic superfluid disk, when the rotational velocity is large
enough, we find a giant vortex will form in the center of the system by merging
several single charge vortices at some specific rotational velocity, with a
phase stratification phenomenon for the order parameter. The formation of a
giant vortex can be explained as there is not enough space for a standard
vortex lattice. Keep increasing the rotational velocity the giant vortex will
disappear and there will be an appearance of a superfluid ring. In the giant
vortex region, the number of vortices measured from winding number and
rotational velocity always satisfies the linear Feynman relation. However, when
the superfluid ring starts to appear, the number of vortices in the disk will
decrease though the rotational velocity is increasing, where most of the order
parameter is suppressed
Efficient routing on scale-free networks based on local information
In this letter, we propose a new routing strategy with a single free
parameter only based on local information of network topology. In
order to maximize the packets handling capacity of underlying structure that
can be measured by the critical point of continuous phase transition from free
flow to congestion, the optimal value of is sought out. By
investigating the distributions of queue length on each node in free state, we
give an explanation why the delivering capacity of the network can be enhanced
by choosing the optimal . Furthermore, dynamic properties right after
the critical point are also studied. Interestingly, it is found that although
the system enters the congestion state, it still possesses partial delivering
capability which do not depend on . This phenomenon suggests that the
capacity of the network can be enhanced by increasing the forwarding ability of
small important nodes which bear severe congestion.Comment: 4 pages, 7 figure
ChatGPT for Shaping the Future of Dentistry: The Potential of Multi-Modal Large Language Model
The ChatGPT, a lite and conversational variant of Generative Pretrained
Transformer 4 (GPT-4) developed by OpenAI, is one of the milestone Large
Language Models (LLMs) with billions of parameters. LLMs have stirred up much
interest among researchers and practitioners in their impressive skills in
natural language processing tasks, which profoundly impact various fields. This
paper mainly discusses the future applications of LLMs in dentistry. We
introduce two primary LLM deployment methods in dentistry, including automated
dental diagnosis and cross-modal dental diagnosis, and examine their potential
applications. Especially, equipped with a cross-modal encoder, a single LLM can
manage multi-source data and conduct advanced natural language reasoning to
perform complex clinical operations. We also present cases to demonstrate the
potential of a fully automatic Multi-Modal LLM AI system for dentistry clinical
application. While LLMs offer significant potential benefits, the challenges,
such as data privacy, data quality, and model bias, need further study.
Overall, LLMs have the potential to revolutionize dental diagnosis and
treatment, which indicates a promising avenue for clinical application and
research in dentistry
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