367,436 research outputs found
Geometry of Spectral Curves and All Order Dispersive Integrable System
We propose a definition for a Tau function and a spinor kernel (closely
related to Baker-Akhiezer functions), where times parametrize slow (of order
1/N) deformations of an algebraic plane curve. This definition consists of a
formal asymptotic series in powers of 1/N, where the coefficients involve theta
functions whose phase is linear in N and therefore features generically fast
oscillations when N is large. The large N limit of this construction coincides
with the algebro-geometric solutions of the multi-KP equation, but where the
underlying algebraic curve evolves according to Whitham equations. We check
that our conjectural Tau function satisfies Hirota equations to the first two
orders, and we conjecture that they hold to all orders. The Hirota equations
are equivalent to a self-replication property for the spinor kernel. We analyze
its consequences, namely the possibility of reconstructing order by order in
1/N an isomonodromic problem given by a Lax pair, and the relation between
"correlators", the tau function and the spinor kernel. This construction is one
more step towards a unified framework relating integrable hierarchies,
topological recursion and enumerative geometry
An efficient data exchange mechanism for chained network functions
Thanks to the increasing success of virtualization technologies and processing capabilities of computing devices, the deployment of virtual network functions is evolving towards a unified approach aiming at concentrating a huge amount of such functions within a limited number of commodity servers. To keep pace with this trend, a key issue to address is the definition of a secure and efficient way to move data between the different virtualized environments hosting the functions and a centralized component that builds the function chains within a single server. This paper proposes an efficient algorithm that realizes this vision and that, by exploiting the peculiarities of this application domain, is more efficient than classical solutions. The algorithm that manages the data exchanges is validated by performing a formal verification of its main safety and security properties, and an extensive functional and performance evaluation is presented
Towards a unified definition of solar limb during central eclipses and daily transits
The diameter of the Sun has been measured using Baily's beads during central
eclipses, observed with portable telescopes. A blend of tiny emission lines
produced in the first several hundred kilometers above the photosphere gives a
light signal which prolonges the light curves of the beads. The simple
criterion of light OFF/ON adopted in the previous approaches to define the
timing of photosphere's disappearance/reappearance is modified. The technique
of the limb darkening function reconstruction from the Baily's beads light
curves is introduced here.Comment: 9 pages, 6 figures, Proc. of the 2nd Galileo-Xu Guangqi Meeting,
Ventimiglia - Villa Hanbury, Italy, 11-16 July 201
Mathematical Definitions of Scene and Scenario for Analysis of Automated Driving Systems in Mixed-Traffic Simulations
This paper introduces a unified mathematical definition for describing commonly used terms encountered in systematical analysis of automated driving systems in mixed-traffic simulations. The most significant contribution of this work is in translating the terms that are clarified previously in literature into a mathematical set and function based format. Our work can be seen as an incremental step towards further formalisation of Domain-Specific-Language (DSL) for scenario representation. We also extended the previous work in the literature to allow more complex scenarios by expanding the model-incompliant information using set-theory to represent the perception capacity of the road-user agents. With this dynamic perception definition, we also support interactive scenarios and are not limited to reactive and pre-defined agent behavior. Our main focus is to give a framework to represent realistic road-user behavior to be used in simulation or computational tool to examine interaction patterns in mixed-traffic conditions. We believe that, by formalising the verbose definitions and extending the previous work in DSL, we can support automatic scenario generation and dynamic/evolving agent behavior models for simulating mixed traffic situations and scenarios. In addition, we can obtain scenarios that are realistic but also can represent rare-conditions that are difficult to extract from field-tests and real driving data repositories
Towards a unified approach to information-disturbance tradeoffs in quantum measurements
We show that the global balance of information dynamics for general quantum
measurements given in [F. Buscemi, M. Hayashi, and M. Horodecki, Phys.Rev.Lett.
100, 210504 (2008)] makes it possible to unify various and generally
inequivalent approaches adopted in order to derive information-disturbance
tradeoffs in quantum theory. We focus in particular on those tradeoffs,
constituting the vast majority of the literature on the subject, where
disturbance is defined either in terms of average output fidelity or of
entanglement fidelity
Adversarial Attack and Defense on Graph Data: A Survey
Deep neural networks (DNNs) have been widely applied to various applications
including image classification, text generation, audio recognition, and graph
data analysis. However, recent studies have shown that DNNs are vulnerable to
adversarial attacks. Though there are several works studying adversarial attack
and defense strategies on domains such as images and natural language
processing, it is still difficult to directly transfer the learned knowledge to
graph structure data due to its representation challenges. Given the importance
of graph analysis, an increasing number of works start to analyze the
robustness of machine learning models on graph data. Nevertheless, current
studies considering adversarial behaviors on graph data usually focus on
specific types of attacks with certain assumptions. In addition, each work
proposes its own mathematical formulation which makes the comparison among
different methods difficult. Therefore, in this paper, we aim to survey
existing adversarial learning strategies on graph data and first provide a
unified formulation for adversarial learning on graph data which covers most
adversarial learning studies on graph. Moreover, we also compare different
attacks and defenses on graph data and discuss their corresponding
contributions and limitations. In this work, we systemically organize the
considered works based on the features of each topic. This survey not only
serves as a reference for the research community, but also brings a clear image
researchers outside this research domain. Besides, we also create an online
resource and keep updating the relevant papers during the last two years. More
details of the comparisons of various studies based on this survey are
open-sourced at
https://github.com/YingtongDou/graph-adversarial-learning-literature.Comment: In submission to Journal. For more open-source and up-to-date
information, please check our Github repository:
https://github.com/YingtongDou/graph-adversarial-learning-literatur
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