3,300 research outputs found
Perturbing Inputs to Prevent Model Stealing
We show how perturbing inputs to machine learning services (ML-service)
deployed in the cloud can protect against model stealing attacks. In our
formulation, there is an ML-service that receives inputs from users and returns
the output of the model. There is an attacker that is interested in learning
the parameters of the ML-service. We use the linear and logistic regression
models to illustrate how strategically adding noise to the inputs fundamentally
alters the attacker's estimation problem. We show that even with infinite
samples, the attacker would not be able to recover the true model parameters.
We focus on characterizing the trade-off between the error in the attacker's
estimate of the parameters with the error in the ML-service's output
Vector bundles on G(1,4) without intermediate cohomology
We characterize the vector bundles on G(1,4) that have no intermediate
cohomology. We obtain them from extensions of the universal bundles and others
related with them. In particular, we get a characterization of the universal
vector bundles from their cohomology.Comment: 12 page
On rack cohomology
We prove that the lower bounds for Betti numbers of the rack, quandle and
degeneracy cohomology given by Carter, Jelsovsky, Kamada, and Saito, are in
fact equalities. We compute as well the Betti numbers of the twisted cohomology
introduced by Carter, Elhamdadi, and Saito. We also give a group-theoretical
interpretation of the second cohomology group for racks.Comment: Boundary formula corrected. 9 page
On the supergravity formulation of mirror symmetry in generalized Calabi-Yau manifolds
We derive the complete supergravity description of the N=2 scalar potential
which realizes a generic flux-compactification on a Calabi-Yau manifold
(generalized geometry). The effective potential V_{eff}=V_{(\partial_Z V=0)},
obtained by integrating out the massive axionic fields of the special
quaternionic manifold, is manifestly mirror symmetric, i.e. invariant with
respect to {\rm Sp}(2 h_2+2)\times {\rm Sp}(2 h_1+2) and their exchange, being
h_1, h_2 the complex dimensions of the underlying special geometries. {\Scr
V}_{eff} has a manifestly N=1 form in terms of a mirror symmetric
superpotential W$ proposed, some time ago, by Berglund and Mayr.Comment: 14 pages, LaTeX sourc
Apparatus and process for microbial detection and enumeration
An apparatus and process for detecting and enumerating specific microorganisms from large volume samples containing small numbers of the microorganisms is presented. The large volume samples are filtered through a membrane filter to concentrate the microorganisms. The filter is positioned between two absorbent pads and previously moistened with a growth medium for the microorganisms. A pair of electrodes are disposed against the filter and the pad electrode filter assembly is retained within a petri dish by retainer ring. The cover is positioned on base of petri dish and sealed at the edges by a parafilm seal prior to being electrically connected via connectors to a strip chart recorder for detecting and enumerating the microorganisms collected on filter
Flux Vacua Attractors in Type II on SU(3)xSU(3) Structure
We summarize and extend our work on flux vacua attractors in generalized
compactifications. After reviewing the attractor equations for the heterotic
string on SU(3) structure manifolds, we study attractors for N=1 vacua in type
IIA/B on SU(3)xSU(3) structure spaces. In the case of vanishing RR flux, we
find attractor equations that encode Minkowski vacua only (and which correct a
previous normalization error). In addition to our previous considerations, here
we also discuss the case of nonzero RR flux and the possibility of attractors
for AdS vacua.Comment: 10 pages, contribution to the proceedings of the 4th RTN workshop
"Forces Universe", Varna, September 200
Remote water monitoring system
A remote water monitoring system is described that integrates the functions of sampling, sample preservation, sample analysis, data transmission and remote operation. The system employs a floating buoy carrying an antenna connected by lines to one or more sampling units containing several sample chambers. Receipt of a command signal actuates a solenoid to open an intake valve outward from the sampling unit and communicates the water sample to an identifiable sample chamber. Such response to each signal receipt is repeated until all sample chambers are filled in a sample unit. Each sample taken is analyzed by an electrochemical sensor for a specific property and the data obtained is transmitted to a remote sending and receiving station. Thereafter, the samples remain isolated in the sample chambers until the sampling unit is recovered and the samples removed for further laboratory analysis
Hitchin Functionals in N=2 Supergravity
We consider type II string theory in space-time backgrounds which admit eight
supercharges and can be characterized by the existence of an SU(3) x SU(3)
structure. We show that the couplings of such backgrounds strongly resemble the
couplings of four-dimensional N=2 supergravities and precisely coincide with
the N=2 couplings after an appropriate Kaluza-Klein reduction. Specifically we
show that the moduli space of metrics admits a special Kahler geometry with
Kahler potentials given by the Hitchin functionals. Furthermore we explicitly
compute the N=2 version of the superpotential from the transformation law of
the gravitinos, and find its N=1 counterpart.Comment: 62 pages, improved version, to appear in JHE
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