7,078 research outputs found
Reasoning About a Simulated Printer Case Investigation with Forensic Lucid
In this work we model the ACME (a fictitious company name) "printer case
incident" and make its specification in Forensic Lucid, a Lucid- and
intensional-logic-based programming language for cyberforensic analysis and
event reconstruction specification. The printer case involves a dispute between
two parties that was previously solved using the finite-state automata (FSA)
approach, and is now re-done in a more usable way in Forensic Lucid. Our
simulation is based on the said case modeling by encoding concepts like
evidence and the related witness accounts as an evidential statement context in
a Forensic Lucid program, which is an input to the transition function that
models the possible deductions in the case. We then invoke the transition
function (actually its reverse) with the evidential statement context to see if
the evidence we encoded agrees with one's claims and then attempt to
reconstruct the sequence of events that may explain the claim or disprove it.Comment: 18 pages, 3 figures, 7 listings, TOC, index; this article closely
relates to arXiv:0906.0049 and arXiv:0904.3789 but to remain stand-alone
repeats some of the background and introductory content; abstract presented
at HSC'09 and the full updated paper at ICDF2C'11. This is an updated/edited
version after ICDF2C proceedings with more references and correction
Formally Specifying and Proving Operational Aspects of Forensic Lucid in Isabelle
A Forensic Lucid intensional programming language has been proposed for
intensional cyberforensic analysis. In large part, the language is based on
various predecessor and codecessor Lucid dialects bound by the higher-order
intensional logic (HOIL) that is behind them. This work formally specifies the
operational aspects of the Forensic Lucid language and compiles a theory of its
constructs using Isabelle, a proof assistant system.Comment: 23 pages, 3 listings, 3 figures, 1 table, 1 Appendix with theorems,
pp. 76--98. TPHOLs 2008 Emerging Trends Proceedings, August 18-21, Montreal,
Canada. Editors: Otmane Ait Mohamed and Cesar Munoz and Sofiene Tahar. The
individual paper's PDF is at
http://users.encs.concordia.ca/~tphols08/TPHOLs2008/ET/76-98.pd
Fault tolerant architectures for integrated aircraft electronics systems, task 2
The architectural basis for an advanced fault tolerant on-board computer to succeed the current generation of fault tolerant computers is examined. The network error tolerant system architecture is studied with particular attention to intercluster configurations and communication protocols, and to refined reliability estimates. The diagnosis of faults, so that appropriate choices for reconfiguration can be made is discussed. The analysis relates particularly to the recognition of transient faults in a system with tasks at many levels of priority. The demand driven data-flow architecture, which appears to have possible application in fault tolerant systems is described and work investigating the feasibility of automatic generation of aircraft flight control programs from abstract specifications is reported
A strategy for automatically generating programs in the lucid programming language
A strategy for automatically generating and verifying simple computer programs is described. The programs are specified by a precondition and a postcondition in predicate calculus. The programs generated are in the Lucid programming language, a high-level, data-flow language known for its attractive mathematical properties and ease of program verification. The Lucid programming is described, and the automatic program generation strategy is described and applied to several example problems
Does quantum nonlocality irremediably conflict with Special Relativity?
We reconsider the problem of the compatibility of quantum nonlocality and the
requests for a relativistically invariant theoretical scheme. We begin by
discussing a recent important paper by T. Norsen [arXiv:0808.2178] on this
problem and we enlarge our considerations to give a general picture of the
conceptually relevant issue to which this paper is devoted.Comment: 18 pages, 1 figur
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