Autor: Sacha, K. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Credential revocation in the RT Framework
Autorzy:: Pikulski, W.
Sacha, K.
Powiązania:: https://bibliotekanauki.pl/articles/115578.pdf
Data publikacji:: 2013
Wydawca:: Fundacja na Rzecz Młodych Naukowców
Tematy:: Software security
trust management
credential revocation
RT Framework
nonmonotonicity
credential chain
credential graph
freshness constraints
freshness graph
Opis:: The paper is focused on nonmonotonicity in trust management models which provide access control mechanisms for distributed systems. The work explains what decentralised systems are, defines a notion of security model nonmonotonicity, presents its types and points out factors that causes trust management model to become nonmonotonic. A result of this analysis is a model for credential revocation in the RT Framework trust management model. When security model allows for credential revocation, it becomes nonmonotonic. Presented model allows to turn it to be temporally monotonic. It allows policy authors to define constraints for roles, and applies those values to credentials. When credential does not comply to defined requirements, it is disregarded. A model is evaluated against sample scenario, which demonstrates how it can be applied to real-life use cases.
Źródło:: Challenges of Modern Technology; 2013, 4, 3; 16-22
2082-2863
2353-4419
Pojawia się w:: Challenges of Modern Technology
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Quantum Bright Soliton in a Disorder Potential
Autorzy:: Sacha, K.
Delande, D.
Zakrzewski, J.
Powiązania:: https://bibliotekanauki.pl/articles/1585122.pdf
Data publikacji:: 2009-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 03.75.Lm
72.15.Rn
05.30.Jp
Opis:: At very low temperature, a quasi-one-dimensional ensemble of atoms with attractive interactions tend to form a bright soliton. When exposed to a sufficiently weak external potential, the shape of the soliton is not modified, but its external motion is affected. We develop in detail the Bogoliubov approach for the problem, treating, in a non-perturbative way, the motion of the center of mass of the soliton. Quantization of this motion allows us to discuss its long time properties. In particular, in the presence of a disordered potential, the quantum motion of the center of mass of a bright soliton may exhibit Anderson localization, on a localization length which may be much larger than the soliton size and could be observed experimentally.
Źródło:: Acta Physica Polonica A; 2009, 116, 5; 772-778
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Nonsequential Double Ionization of Atoms in Strong Laser Pulses
Autorzy:: Prauzner-Bechcicki, J. S.
Sacha, K.
Eckhardt, B.
Zakrzewski, J.
Powiązania:: https://bibliotekanauki.pl/articles/2047833.pdf
Data publikacji:: 2007-10
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 32.80.Rm
32.80.Fb
03.65.-w
02.60.Cb
02.60.-x
Opis:: It is now possible to produce laser pulses with reproducible pulse shape and controlled carrier envelope phase. It is discussed how that can be explored in double ionisation studies. To this end we solve numerically the Schrödinger equation for a limited dimensionality model which nevertheless treats electron repulsion qualitatively correctly and allows to study correlation effects due to the Coulomb repulsion.
Źródło:: Acta Physica Polonica A; 2007, 112, 4; 699-706
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: Cold Atomic Gases in Optical Lattices with Disorder
Autorzy:: Schulte, T.
Drenkelforth, S.
Kruse, J.
Ertmer, W.
Arlt, J. J.
Kantian, A.
Sanchez-Palencia, L.
Santos, L.
Sanpera, A.
Sacha, K.
Zoller, P.
Lewenstein, M.
Zakrzewski, J.
Powiązania:: https://bibliotekanauki.pl/articles/2044614.pdf
Data publikacji:: 2006-01
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 03.75.Kk
03.75.Lm
05.30.Jp
64.60.Cn
Opis:: Cold atomic gases placed in optical lattices enable studies of simple condensed matter theory models with parameters that may be tuned relatively easily. When the optical potential is randomized (e.g. using laser speckle to create a random intensity distribution) one may be able to observe Anderson localization of matter waves for non-interacting bosons, the so-called Bose glass in the presence of interactions, as well as the Fermi glass or quantum spin glass for mixtures of fermions and bosons.
Źródło:: Acta Physica Polonica A; 2006, 109, 1; 89-99
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 5.

Tytuł:: Prokoagulanty tkanek nowotworowych
Prokoaguljanty opukholevykh tkanejj
Procoagulants of neoplastic tissues
Autorzy:: Grygoruk, M.
Żurawski, P.
Sacha, J.
Jakowluk, I.
Worowski, K.
Powiązania:: https://bibliotekanauki.pl/articles/2187979.pdf
Data publikacji:: 1984
Wydawca:: Polskie Towarzystwo Diagnostyki Laboratoryjnej
Źródło:: Diagnostyka Laboratoryjna; 1984, 20, 5-6; 251-262
0867-4043
Pojawia się w:: Diagnostyka Laboratoryjna
Dostawca treści:: Biblioteka Nauki

Artykuł

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