A Type Inference Algorithm for Secure Ambients Barbanera, Franco; Dezani-Ciancaglini, Mariangiola; Salvo, Ivano ...
Electronic notes in theoretical computer science,
June 2002, 2002-06-00, Letnik:
62
Journal Article
Odprti dostop
We consider a type discipline for the Ambient Calculus that associates ambients with security levels and constrains them to be traversed by or opened in ambients of higher security clearance only. We ...present a bottom-up algorithm that, given an untyped process P, computes a minimal set of constraints on security levels such that all actions during runs of P are performed without violating the security level priorities. Such an algorithm appears to be a prerequisite to use type systems to ensure security properties in the web scenario.
In order to evaluate the antibody response to anti-hepatitis B vaccine, 21 heroin addicted with HIV infection previously vaccinated, were studied. 18 patients were asymptomatic and 3 were at the LAS ...stage. An antibody response was estimated at 1 and 12 months after the end of the vaccination. The first control showed that 62% presented a protective anti-HBs (higher than 10 mU/ml); after one year 70% of responders had a persistent immunity. The antibody response showed no correlation with the value of immunologic tests; the vaccine showed neither a significant evidence of side-effects nor a negative influence on the HIV infection.
\(K^{+}\rightarrow\pi^{+}\nu\overline{\nu}\) is one of the theoretically cleanest meson decay where to look for indirect effects of new physics complementary to LHC searches. The NA62 experiment at ...CERN SPS is designed to measure the branching ratio of this decay with 10\% precision. NA62 took data in pilot runs in 2014 and 2015 reaching the final designed beam intensity. The quality of 2015 data acquired, in view of the final measurement, will be presented.
The authors are supervising a multicenter study on a large cohort of intravenous heroin users for whom the date of seroconversion (the availability of a negative test preceding the confirmed positive ...one was a criterion for enrollment) could be identified. The aim of the study was to evaluate the risk of AIDS in HIV seroconverters who are drug injectors and to identify cofactors associated with the disease progression. The authors enrolled 201 newly seropositive individuals. Follow-up time was distributed over a 4-y period, because in some of the enrollees the test was performed retrospectively. The actuarial incidence of AIDS in the cohort, estimated by the Kaplan-Meier survival technique, was 1.5% in the first year after seroconversion but 18% in those followed for 4 y after seroconversion.
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A Filter Model for the λμ-Calculus van Bakel, Steffen; Barbanera, Franco; de’Liguoro, Ugo
Typed Lambda Calculi and Applications
Book Chapter
We introduce an intersection type assignment system for the pure λμ-calculus, which is invariant under subject reduction and expansion. The system is obtained by describing Streicher and Reus’s ...denotational model of continuations in the category of ω-algebraic lattices via Abramsky’s domain logic approach. This provides a tool for showing the completeness of the type assignment system with respect to the continuation models via a filter model construction. We also show that typed λμ-terms in Parigot’s system have a non-trivial intersection typing in our system.
In the absence of a functional barrier, mineral oil hydrocarbons from printing inks and recycled fibres tend to migrate from paper-based food-packaging materials through the gas phase into dry food. ...Concentrations easily far exceed the limit derived from the acceptable daily intake (ADI) of the Joint FAO/WHO Expert Committee on Food Additives (JECFA). Since the estimation of long-term migration into the food by testing at 40°C for 10 days is difficult, it seems preferable (and easier) to use the mineral oil content in the paperboard. Evaporation experiments showed that hydrocarbons eluted up to about n-C24 are sufficiently volatile for relevant migration into dry food: in worst-case situations, about 80% migrate into the packed food. The extraction of the paperboard was optimised to give good recovery of the relevant hydrocarbons, but to discriminate against those of high molecular mass which tend to disturb gas chromatographic analysis in on-line coupled normal phase HPLC-GC-FID. Even though some of the relevant hydrocarbons had already evaporated, the average concentration of < C24 mineral oil saturated hydrocarbons (MOSH) in the paperboard boxes of 102 products from the Swiss and Italian market was 626 mg kg-1. Nearly 15% of investigated boxes still contained more than 1000 mg kg-1 < C24 MOSH up to over 3000 mg kg-1 (maximum = 3500 mg kg-1). This amount of MOSH in the board have the potential of contaminating the packed food at a level exceeding the limit, derived from the JECFA ADI, hundreds of times.
Toward a semantics for the QUEST language Alessi, F.; Barbanera, F.
1991 Proceedings Sixth Annual IEEE Symposium on Logic in Computer Science,
1991
Conference Proceeding
Odprti dostop
A model is given for the second-order lambda calculus extended with inheritance, bounded quantification, recursive types, constructors and kinds. This language, called mu -FunK, can be viewed as the ...core of the QUEST language defined by L. Cardelli (SRC Rep. 45, 1989). Types are interpreted as intervals of partial equivalence relations. Because of the properties of intervals and their ordering, all the type constructors are continuous functions. As a consequence a system where a kind is given to each constructor constant employed can be modeled. In such a model the meaning of operator mu , the constructor of recursive types, turns out to be just the minimal fixed-point operator.< >
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