Hoover sign

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Important observations prior to the description of the Hoover sign.

OBJECTIVE To study the context in which Hoover described his sign for differentiating hysterical and organic hemiplegia. BACKGROUND At the turn of the 20th century, many physicians were looking for signs to distinguish organic from hysterical hemiparesis. In 1908, Hoover described his sign of "complementary opposition." Other signs based on associated movements of the upper extremities, lower...

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Bulgac-Kusnezov-Nosé-Hoover thermostats.

In this paper, we formulate Bulgac-Kusnezov constant temperature dynamics in phase space by means of non-Hamiltonian brackets. Two generalized versions of the dynamics are similarly defined, one where the Bulgac-Kusnezov demons are globally controlled by means of a single additional Nosé variable, and another where each demon is coupled to an independent Nosé-Hoover thermostat. Numerically stab...

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Non-ergodicity of Nosé-Hoover dynamics

The Nosé-Hoover dynamics is a deterministic method that is commonly used to sample the canonical Gibbs measure. This dynamics extends the physical Hamiltonian dynamics by the addition of a “thermostat” variable, that is coupled nonlinearly with the physical variables. The accuracy of the method depends on the dynamics being ergodic. Numerical experiments have been published earlier that are con...

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Authentication Protocols Using Hoover-Kausik's Software Token

In 1999, Hoover and Kausik introduced a software token using the cryptographic camouflage technique and claimed that it can resist various on-line and off-line guessing attacks. Later, Kwon presented an authentication protocol based on the cryptographic camouflage technique and DSA, and pointed out that this initial protocol is vulnerable to an impersonation attack once a server’s secret key or...

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Nosé - Hoover dynamics for coherent states

The popular method of Nosé and Hoover to create canonically distributed positions and momenta in classical molecular dynamics simulations is generalized to a genuine quantum system of infinite dimensionality. We show that for the quantum harmonic oscillator, the equations of motion in terms of coherent states can easily be modified in an analogous manner to mimic the coupling of the system to a...

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ژورنال

عنوان ژورنال: Canadian Medical Association Journal

سال: 2010

ISSN: 0820-3946,1488-2329

DOI: 10.1503/cmaj.092092