25,253 research outputs found
COST Action IC 1402 ArVI: Runtime Verification Beyond Monitoring -- Activity Report of Working Group 1
This report presents the activities of the first working group of the COST
Action ArVI, Runtime Verification beyond Monitoring. The report aims to provide
an overview of some of the major core aspects involved in Runtime Verification.
Runtime Verification is the field of research dedicated to the analysis of
system executions. It is often seen as a discipline that studies how a system
run satisfies or violates correctness properties. The report exposes a taxonomy
of Runtime Verification (RV) presenting the terminology involved with the main
concepts of the field. The report also develops the concept of instrumentation,
the various ways to instrument systems, and the fundamental role of
instrumentation in designing an RV framework. We also discuss how RV interplays
with other verification techniques such as model-checking, deductive
verification, model learning, testing, and runtime assertion checking. Finally,
we propose challenges in monitoring quantitative and statistical data beyond
detecting property violation
Experimenting with independent and-parallel prolog using standard prolog
This paper presents an approximation to the study of parallel systems using sequential tools. The Independent And-parallelism in Prolog is an example of parallel processing paradigm in the framework of logic programming, and implementations like <fc-Prolog uncover the potential performance of parallel processing. But this potential can also be explored using only sequential systems. Being the spirit of this paper to show how this can be done with a standard system, only standard Prolog will be used in the implementations included. Such implementations include tests for parallelism in And-Prolog, a correctnesschecking
meta-interpreter of <fc-Prolog and a simulator of parallel execution for <fc-Prolog
Checking-in on Network Functions
When programming network functions, changes within a packet tend to have
consequences---side effects which must be accounted for by network programmers
or administrators via arbitrary logic and an innate understanding of
dependencies. Examples of this include updating checksums when a packet's
contents has been modified or adjusting a payload length field of a IPv6 header
if another header is added or updated within a packet. While static-typing
captures interface specifications and how packet contents should behave, it
does not enforce precise invariants around runtime dependencies like the
examples above. Instead, during the design phase of network functions,
programmers should be given an easier way to specify checks up front, all
without having to account for and keep track of these consequences at each and
every step during the development cycle. In keeping with this view, we present
a unique approach for adding and generating both static checks and dynamic
contracts for specifying and checking packet processing operations. We develop
our technique within an existing framework called NetBricks and demonstrate how
our approach simplifies and checks common dependent packet and header
processing logic that other systems take for granted, all without adding much
overhead during development.Comment: ANRW 2019 ~ https://irtf.org/anrw/2019/program.htm
What Did Slaves Wear? Textile Regimes In The French Caribbean
This study of the dress of enslaved men and women in the French Antilles is based on a critical examination of written and pictorial sources. Analyzing work clothes, by law masters’ responsibility, and festive apparel, which slaves themselves procured, the article focuses on the possibilities and limits of subordinate populations’ innovation in material culture. With comparisons to sartorial practices of enslaved people and other groups in the Caribbean and in the larger world, the paper addresses issues in the history of consumption and of the Atlantic basin in the seventeenth and eighteenth centuries, arguing that both standardization and diversification were fundamental features of early modern globalization
Stan i perspektywy kształcenia w zakresie GIS i geoinformacji w Polsce na uniwersyteckich kierunkach geograficznych
Norway Grants FSS/2014/HEI/W/0114/U/001
Separation kernel robustness testing : the xtratum case study
With time and space partitioned architectures becoming increasingly appealing to the European space sector, the dependability of separation kernel technology is a key factor to its applicability in European Space Agency projects. This paper explores the potential of the data type fault model, which injects faults through the Application Program Interface, in separation kernel robustness testing. This fault injection methodology has been tailored to investigate its relevance in uncovering vulnerabilities within separation kernels and potentially contributing towards fault removal campaigns within this domain. This is demonstrated through a robustness testing case study of the XtratuM separation kernel for SPARC LEON3 processors. The robustness campaign exposed a number of vulnerabilities in XtratuM, exhibiting the potential benefits of using such a methodology for the robustness assessment of separation kernels.peer-reviewe
Black Holes on FIRE: Stellar Feedback Limits Early Feeding of Galactic Nuclei
We introduce massive black holes (BHs) in the Feedback In Realistic
Environments project and perform high-resolution cosmological hydrodynamic
simulations of quasar-mass halos () down to . These simulations model stellar
feedback by supernovae, stellar winds, and radiation, and BH growth using a
gravitational torque-based prescription tied to resolved properties of galactic
nuclei. We do not include BH feedback. We show that early BH growth occurs
through short (Myr) accretion episodes that can reach or even
exceed the Eddington rate. In this regime, BH growth is limited by bursty
stellar feedback continuously evacuating gas from galactic nuclei, and BHs
remain under-massive relative to the local -
relation. BH growth is more efficient at later times, when the nuclear stellar
potential retains a significant gas reservoir, star formation becomes less
bursty, and galaxies settle into a more ordered state, with BHs rapidly
converging onto the scaling relation when the host reaches . Our results are not sensitive to the details of the
accretion model so long as BH growth is tied to the gas content within pc of the BH. Our simulations imply that bursty stellar feedback has
strong implications for BH and AGN demographics, especially in the early
Universe and for low-mass galaxies.Comment: 5 pages, 3 figures, submitted to MNRA
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