نتایج جستجو برای: function generator

تعداد نتایج: 1249988  

2008
WILL DISON

Given a right-angled Artin group A, the associated BestvinaBrady group is defined to be the kernel of the homomorphism A → Z that maps each generator in the standard presentation of A to a fixed generator of Z. We prove that the Dehn function of an arbitrary finitely presented BestvinaBrady group is bounded above by n. This is the best possible universal upper bound.

2017
Elena Di Bernardino Didier Rullière

The class of multivariate Archimedean copulas is defined by using a realvalued function called the generator of the copula. This generator satisfies some properties, including d-monotonicity. We propose here a new basic transformation of this generator, preserving these properties, thus ensuring the validity of the transformed generator and inducing a proper valid copula. This transformation ac...

Journal: : 2023

It is noted that as a generalized characteristic of the functional gas generator, which sensitive to variations in its parameters, it advisable use transfer function, or analogue - amplitude-phase frequency generator. The generator includes two components amplitude-frequency and phase-frequency characteristics. During operation there will be parameters transmission coefficient time constants, d...

2008
Shoichi Hirose

HMAC DRBG is a deterministic random bit generator using HMAC specified in NIST SP 800-90. The document claims that HMAC DRBG is a pseudorandom bit generator if HMAC is a pseudorandom function. However, no proof is given in the document. This article provides a security analysis of HMAC DRBG and confirms the claim.

Journal: :روش های عددی در مهندسی (استقلال) 0
سید مرتضی سقائیان نژاد و فرزاد فرهمند s.m. saghaian and f.farahmand

in this article our objective is to obtain steady state characteristics of shunt, series, and separately excited dc motors coupled with a centrifugal water pump supplied through a step-up, step-down, and cuk converter from photovoltaic generator. we assume that there are no storage batteries and, of course, the system must operate on maximum utilization i.e. maximum water must be pumped. it is ...

2011
Janusz Matkowski Małgorzata Wróbel M. Wróbel

We prove that the generator of any uniformly bounded set-valued Nemytskij operator acting between generalized Hölder function metric spaces, with nonempty compact and convex values is an affine function with respect to the function variable.

پایان نامه :دانشگاه تربیت معلم - تهران - دانشکده علوم 1393

in this thesis, structural, electronical, and optical properties of inverse pervskite(ca3pbo) in cubic phase have been investigated.the calculation have been done based on density functional theory and according to generalized gradiant approximate (gga) as correlating potential. in order to calculate the configurations, implementing in the wien2k code have been used from 2013 version. first of ...

2012
Grigory Marshalko Alexey Pokrovskiy

In 2011 ISO standardized [2] a family of deterministic pseudorandom bit generators MQ—DRBG, based on multivariate quadratic functions satisfying certain properties. The security of the generator could be described in terms of complexity of solving the corresponding system of multivariate quadratic equations. In our previous article [1] we proposed two different techniques for constructing syste...

1990
Josef Pieprzyk

The paper examines permutation generators which are designed using four rounds of the Data Encryption Standard and a single pseudorandom function. We have proved that such generators are pseudorandom only if the pseudorandom function is used internally at least five times. The proof is given using two different approaches: deterministic and probabilistic. Some cryptographic implications are als...

2006
Dan Boneh Xavier Boyen

Let H1, H2 be two hash functions. We wish to construct a new hash function H that is collision resistant if at least one of H1 or H2 is collision resistant. Concatenating the output of H1 and H2 clearly works, but at the cost of doubling the hash output size. We ask whether a better construction exists, namely, can we hedge our bets without doubling the size of the output? We take a step toward...

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