40 research outputs found
Project Final Report Final Publishable Summary Report
This document is the final publishable summary report, part of the CONNECT final report
Final CONNECT Architecture
Interoperability remains a fundamental challenge when connecting heterogeneous systems which encounter and spontaneously communicate with one another in pervasive computing environments. This challenge is exasperated by the highly heterogeneous technologies employed by each of the interacting parties, i.e., in terms of hardware, operating system, middleware protocols, and application protocols. The key aim of the CONNECT project is to drop this heterogeneity barrier and achieve universal interoperability. Here we report on the revised CONNECT architecture, highlighting the integration of the work carried out to integrate the CONNECT enablers developed by the different partners; in particular, we present the progress of this work towards a finalised concrete architecture. In the third year this architecture has been enhanced to: i) produce concrete CONNECTors, ii) match networked systems based upon their goals and intent, and iii) use learning technologies to find the affordance of a system. We also report on the application of the CONNECT approach to streaming based systems, further considering exploitation of CONNECT in the mobile environment
Finalised dependability framework and evaluation results
The ambitious aim of CONNECT is to achieve universal interoperability between heterogeneous Networked Systems by means of on-the-fly synthesis of the CONNECTors through which they communicate. The goal of WP5 within CONNECT is to ensure that the non-functional properties required at each side of the connection going to be established are fulfilled, including dependability, performance, security and trust, or, in one overarching term, CONNECTability. To model such properties, we have introduced the CPMM meta-model which establishes the relevant concepts and their relations, and also includes a Complex Event language to express the behaviour associated with the specified properties. Along the four years of project duration, we have developed approaches for assuring CONNECTability both at synthesis time and at run-time. Within CONNECT architecture, these approaches are supported via the following enablers: the Dependability and Performance analysis Enabler, which is implemented in a modular architecture supporting stochastic verification and state-based analysis. Dependability and performance analysis also relies on approaches for incremental verification to adjust CONNECTor parameters at run-time; the Security Enabler, which implements a Security-by-Contract-with-Trust framework to guarantee the expected security policies and enforce them accordingly to the level of trust; the Trust Manager that implements a model-based approach to mediate between different trust models and ensure interoperable trust management. The enablers have been integrated within the CONNECT architecture, and in particular can interact with the CONNECT event-based monitoring enabler (GLIMPSE Enabler released within WP4) for run-time analysis and verification. To support a Model-driven approach in the interaction with the monitor, we have developed a CPMM editor and a translator from CPMM to the GLIMPSE native language (Drools). In this document that is the final deliverable from WP5 we first present the latest advances in the fourth year concerning CPMM, Dependability&Performance Analysis, Incremental Verification and Security. Then, we make an overall summary of main achievements for the whole project lifecycle. In appendix we also include some relevant articles specifically focussing on CONNECTability that have been prepared in the last period
Design of Approaches for Dependability and Initial Prototypes
The aim of CONNECT is to achieve universal interoperability between heterogeneous Networked Systems. For this, the non-functional properties required at each side of the connection going to be established must be fulfilled. By the one inclusive term "CONNECTability" we comprehend properties belonging to all four non-functional concerns of interest for CONNECT, namely dependability, performance, security and trust. We model such properties in conformance with a meta-model which establishes the relevant concepts and their relations. Then, building on the conceptual models proposed in the first year in Deliverable D5.1, in this document we present the approaches developed for assuring CONNECTability both at synthesis time and at runtime. The contributions include: the Dependability&Performance analysis Enabler, for which we release a modular architecture supporting stochastic verification and state-based analysis; incremental verification and event-based monitoring for runtime analysis; a model-based approach to interoperable trust management; the Security-by-Contract-with-Trust framework, which guarantees and enforces the expected trust levels and security policies
Project Final Report Use and Dissemination of Foreground
This document is the final report on use and dissemination of foreground, part of the CONNECT final report. The document provides the lists of: publications, dissemination activities, and exploitable foregroun
Crossed product algebras and generalized entropy for subregions
An early result of algebraic quantum field theory is that the algebra of any
subregion in a QFT is a von Neumann factor of type III, in which entropy
cannot be well-defined because such algebras do not admit a trace or density
states. However, associated to the algebra is a modular group of automorphisms
characterizing the local dynamics of degrees of freedom in the region, and the
crossed product of the algebra with its modular group yields a type II
factor, in which traces and hence von Neumann entropy can be well-defined. In
this work, we generalize recent constructions of the crossed product algebra
for the TFD to, in principle, arbitrary spacetime regions in arbitrary QFTs,
paving the way to the study of entanglement entropy without UV divergences. In
this sense, the crossed product construction represents a refinement of Haag's
assignment of nets of observable algebras to spacetime regions by providing a
natural construction of a type II factor. We present several concrete examples:
a QFT in Rindler space, a CFT in an open ball of Minkowski space, and arbitrary
boundary subregions in AdS/CFT. In the holographic setting, we provide a novel
argument for why the bulk dual must be the entanglement wedge, and discuss the
distinction arising from boundary modular flow between causal and entanglement
wedges for excited states and disjoint regions.Comment: 31+8 pages, 3 figure
Uneven encounters and paradoxical rights: embodiment and difference in sexual orientation rights and activism
My
thesis
takes
the
intersection
of
sexual
orientation
and
human
rights
and
the
increased
tendency
towards
the
expression
of
the
concerns
of
sexual
minorities
in
rights
based
terminology
in
international
law
as
a
Deleuzian
âproblemâ
to
be
explored
and
unpicked.
Sexual
orientation
is
a
singular
expression
of
a
complex
multifaceted
virtuality,
yet
the
term
-Ââ
understood
as
a
static
and
relatively
unchanging
denotation
of
a
particular
identity
and
mode
of
action
-Ââ
holds
increasing
purchase
as
a
human
rights
issue.
I
explore
the
way
in
which
rights
shape
the
expression
of
sexuality
within
institutional
and
activist
practices
in
international
arenas
and
suggest
that
the
complex
and
contested
encounter
between
sexuality
and
human
rights
in
international
law
exposes
the
problems,
limits
and
temporality
of
both.
By
taking
seriously
the
problems
inherent
to
the
encounters
between
sexuality
and
rights,
as
they
are
expressed
in
different
material
circumstances,
we
can
explore
sexuality
as
a
mutliplicitous
and
changing
flux
and
rights
as
a
dual
sided
paradox,
acting
simultaneously
machines
of
territorialisation
and
machines
of
deteritorialisation.
Thus,
I
suggest
that
in
their
engagement
with
questions
of
'sexual
orientation',
rights
act
as
both
modes
of
control,
restriction
and
exclusion
and
as
modes
of
communication
and
connection,
challenge
and
escape,
depending
upon
the
particular
circumstances
within
which
they
are
expressed.
As
such,
I
attempt
to
engage
with
the
embeddedness
of
âsexualityâ
within
particular
material
contexts
and
through
this
engagement,
explore
different
potentialities
that
are
implicated
within
divergent
enactments
of
rights
and
sexuality
in
order
to
critique
a
mode
of
action
that
remains
fixed
upon
abstract
discussion
of
ossified
âsexualitiesâ
and
transcendental
rights.
Furthermore,
my
aim
is
to
approach
the
encounter
not
only
as
a
means
of
critique
but
also
as
a
moment
of
uncertainty
and
a
site
of
productive
engagement,
vitality
and
becoming.
Thus,
the
key
question
to
be
asked
of the
encounter
between
sexual
orientation
and
rights
is
not
one
of
which
rights
have
been
violated
or
of
how
a
perceived
violation
can
be
expressed
in
relation
to
an
already
conceived
and
fixed
discourse
of
rights,
but
instead,
which
material
circumstances
have
facilitated
the
expression
of
injustice
suffered
by
a
sexual
minority
as
a
rights
violation
and
in
expressing
the
violation
in
this
way,
which
possibilities,
problematics
and
discourses
are
activated,
and
which
others
are
ignored
Crossed product algebras and generalized entropy for subregions
An early result of algebraic quantum field theory is that the algebra of any subregion in a QFT is a von Neumann factor of type III, in which entropy cannot be well-defined because such algebras do not admit a trace or density states. However, associated to the algebra is a modular group of automorphisms characterizing the local dynamics of degrees of freedom in the region, and the crossed product of the algebra with its modular group yields a type II factor, in which traces and hence von Neumann entropy can be well-defined. In this work, we generalize recent constructions of the crossed product algebra for the TFD to, in principle, arbitrary spacetime regions in arbitrary QFTs, paving the way to the study of entanglement entropy without UV divergences. In this sense, the crossed product construction represents a refinement of Haag's assignment of nets of observable algebras to spacetime regions by providing a natural construction of a type II factor. We present several concrete examples: a QFT in Rindler space, a CFT in an open ball of Minkowski space, and arbitrary boundary subregions in AdS/CFT. In the holographic setting, we provide a novel argument for why the bulk dual must be the entanglement wedge, and discuss the distinction arising from boundary modular flow between causal and entanglement wedges for excited states and disjoint regions
Holography and Localization of Information in Quantum Gravity
Within the AdS/CFT correspondence, we identify a class of CFT operators which
represent diff-invariant and approximately local observables in the
gravitational dual. Provided that the bulk state breaks all asymptotic
symmetries, we show that these operators commute to all orders in with
asymptotic charges, thus resolving an apparent tension between locality in
perturbative quantum gravity and the gravitational Gauss law. The
interpretation of these observables is that they are not gravitationally
dressed with respect to the boundary, but instead to features of the state. We
also provide evidence that there are bulk observables whose commutator vanishes
to all orders in with the entire algebra of single-trace operators
defined in a space-like separated time-band. This implies that in a large
holographic CFT, the algebra generated by single-trace operators in a
short-enough time-band has a non-trivial commutant when acting on states which
break the symmetries. It also implies that information deep in the interior of
the bulk is invisible to single-trace correlators in the time-band and hence
that it is possible to localize information in perturbative quantum gravity.Comment: 67 pages + appendices, 6 figure
A Background Independent Algebra in Quantum Gravity
We propose an algebra of operators along an observer's worldline as a
background-independent algebra in quantum gravity. In that context, it is
natural to think of the Hartle-Hawking no boundary state as a universal state
of maximum entropy, and to define entropy in terms of the relative entropy with
this state. In the case that the only spacetimes considered correspond to de
Sitter vacua with different values of the cosmological constant, this
definition leads to sensible results.Comment: 37 pp, various small improvements and added references in verstions.
2,