5,900 research outputs found
Social Security and Retirement across OECD Countries
There are large differences in the employment to population ratio relative to the US across OECD countries, and these differences are even larger for the old age (55-69 years). There are also large differences in various features of social security, such as the replacement rate, the entitlement age or whether it is allowed to collect social security and working. These observations suggest that they might be an important factor. I assess quantitatively this hypothesis using a life cycle general equilibrium model of retirement. I find that the differences in social security can indeed account for the differences in employment to population ratio at old age in the OECD. I also evaluate which features of social security are most important in this context and find that generosity and whether it allows collecting social security while working are the most important contributors
Social security and retirement across OECD countries
There are large differences in the employment to population ratio relative to the US across OECD countries, and these differences are even larger for the old age (55-69 years). There are also large differences in various features of social security, such as the replacement rate, the entitlement age or whether it is allowed to collect social security while working. These observations suggest that they might be an important contributing factor in accounting for differences in retirement. I assess quantitatively the importance of these features using a life cycle general equilibrium model of retirement. I find that the differences in social security account for 90% of the differences in employment to population ratio at ages 60-64 in the OECD. The differences in the replacement rates and whether the system allows for collecting social security while working are the most important contributing factors to account for the differences in retirement.Social security, retirement, idiosyncratic labor income risk
Social Security and Retirement across OECD Countries
There are large differences in the employment to population ratio relative to the US across OECD countries, and these differences are even larger for the old age (55-69 years). There are also large differences in various features of social security, such as the replacement rate, the entitlement age or whether it is allowed to collect social security and working. These observations suggest that they might be an important factor. I assess quantitatively this hypothesis using a life cycle general equilibrium model of retirement. I find that the differences in social security can indeed account for the differences in employment to population ratio at old age in the OECD. I also evaluate which features of social security are most important in this context and find that generosity and whether it allows collecting social security while working are the most important contributors.Social security, retirement, idiosyncratic labor income risk
Fault-tolerant computer architecture based on INMOS transputer processor
Redundant processing was used for several years in mission flight systems. In these systems, more than one processor performs the same task at the same time but only one processor is actually in real use. A fault-tolerance computer architecture based on the features provided by INMOS Transputers is presented. The Transputer architecture provides several communication links that allow data and command communication with other Transputers without the use of a bus. Additionally the Transputer allows the use of parallel processing to increase the system speed considerably. The processor architecture consists of three processors working in parallel keeping all the processors at the same operational level but only one processor is in real control of the process. The design allows each Transputer to perform a test to the other two Transputers and report the operating condition of the neighboring processors. A graphic display was developed to facilitate the identification of any problem by the user
Multimodal Corpora in Second Language Acquisition of English as a Lingua Franca
After exploring the characteristics of intemational English, its wide range of varieties comprended in World Englishes, and the use it shows as a Lingua Franca (ELF); we realize that current English language manifest more variations, language changes and multilingualism than any other language. Departing from these premises, the logical path takes us to understand the impact produced in the ways we acquire English as a second language. Traditional SLA procedures denote obsolescence when approaching ELF. We are then incited to move in the direction of new models that achieve success in ELF. Here, corpora proves to be a useful tool, and particularly multimodal corpora, that shows inspiring results.Departamento de FilologĂa InglesaGrado en Estudios Inglese
Chiral phases of two-dimensional hard-core bosons with frustrated ring-exchange
We study the zero temperature phase diagram of two-dimensional hard-core
bosons on a square lattice with nearest neighbour and plaquette (ring-exchange)
hoppings, at arbitrary densities, by means of a hierarchical mean-field theory.
In the frustrated regime, where quantum Monte Carlo suffers from a sign
problem, we find a rich phase diagram where exotic states with nonzero
chirality emerge. Among them, novel insulating phases, characterized by nonzero
bond-chirality and plaquette order, are found over a large region of the
parameter space. In the unfrustrated regime, the hierarchical mean-field
approach improves over the standard mean-field treatment as it is able to
capture the transition from a superfluid to a valence bond state upon
increasing the strength of the ring-exchange term, in qualitative agreement
with quantum Monte Carlo results
Spatial correlations in nonequilibrium reaction-diffusion problems by the Gillespie algorithm
We present a study of the spatial correlation functions of a one-dimensional
reaction-diffusion system in both equilibrium and out of equilibrium. For the
numerical simulations we have employed the Gillespie algorithm dividing the
system in cells to treat diffusion as a chemical process between adjacent
cells. We find that the spatial correlations are spatially short ranged in
equilibrium but become long ranged in nonequilibrium. These results are in good
agreement with theoretical predictions from fluctuating hydrodynamics for a
one-dimensional system and periodic boundary conditions.Comment: 11 pages, 4 figure
Staircase of crystal phases of hard-core bosons on the Kagome lattice
We study the quantum phase diagram of a system of hard-core bosons on the
Kagome lattice with nearest-neighbor repulsive interactions, for arbitrary
densities, by means of the hierarchical mean field theory and exact
diagonalization techniques. This system is isomorphic to the spin S=1/2 XXZ
model in presence of an external magnetic field, a paradigmatic example of
frustrated quantum magnetism. In the non-frustrated regime, we find two crystal
phases at densities 1/3 and 2/3 that melt into a superfluid phase when
increasing the hopping amplitude, in semi-quantitative agreement with quantum
Monte Carlo computations. In the frustrated regime and away from half-filling,
we find a series of plateaux with densities commensurate with powers of 1/3.
The broader density plateaux (at densities 1/3 and 2/3) are remnants of the
classical degeneracy in the Ising limit. For densities near half-filling, this
staircase of crystal phases melts into a superfluid, which displays finite
chiral currents when computed with clusters having an odd number of sites. Both
the staircase of crystal phases and the superfluid phase prevail in the
non-interacting limit, suggesting that the lowest dispersionless
single-particle band may be at the root of this phenomenon
The Body as an Artifact: Medical Technologies, Anatomy-Policies and Resistance
En este artĂculo se defiende la tesis de que hay un giro importante en el biopoder anatomo-polĂtico de finales del siglo XX y comienzos del XXI. Este giro consiste en la apariciĂłn de diferentes tendencias culturales que comprenden el cuerpo humano como un artefacto que puede usarse para manifestar resistencia al poder. Para ello, estas tendencias se sirven de las tecnologĂas mĂ©dicas como un medio para diseñar el cuerpo de acuerdo con una intenciĂłn particular que permita cumplir cierta funciĂłn elegida de antemano por quien identifica ese cuerpo como propio.In this article, the thesis that there is an important change of direction in anatomy-politics bio-power of the end of XX century and beginning of XXI century is defended. This change of direction refers to the apÂpearance of different cultural trends, which embodies the human body as an artifact that may be used to show resistance to power. For this, these trends use medical technologies as a means to design the agreement body with a specific intention which allows complying certain previously selected function by whom it identifies such a body as his/her own
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