7,162 research outputs found
Hierarchical strategies for efficient fault recovery on the reconfigurable PAnDA device
A novel hierarchical fault-tolerance methodology for reconfigurable devices is presented. A bespoke multi-reconfigurable FPGA architecture, the programmable analogue and digital array (PAnDA), is introduced allowing fine-grained reconfiguration beyond any other FPGA architecture currently in existence. Fault blind circuit repair strategies, which require no specific information of the nature or location of faults, are developed, exploiting architectural features of PAnDA. Two fault recovery techniques, stochastic and deterministic strategies, are proposed and results of each, as well as a comparison of the two, are presented. Both approaches are based on creating algorithms performing fine-grained hierarchical partial reconfiguration on faulty circuits in order to repair them. While the stochastic approach provides insights into feasibility of the method, the deterministic approach aims to generate optimal repair strategies for generic faults induced into a specific circuit. It is shown that both techniques successfully repair the benchmark circuits used after random faults are induced in random circuit locations, and the deterministic strategies are shown to operate efficiently and effectively after optimisation for a specific use case. The methods are shown to be generally applicable to any circuit on PAnDA, and to be straightforwardly customisable for any FPGA fabric providing some regularity and symmetry in its structure
Uma Visão da Empresa Baseada em Habilidades: Contextos Estratégicos e Contingenciais
This paper extends the corporation-based metaphor of the tree by proposing that cognition is the core ability which contributes to nourishing the development of core competencies in the organization. From such an extension, this paper takes a raises the following question: What is the role of cognition in the organization that is in the pursuit of core competencies and sustainable competitive advantage? This paper answers this problem by presenting two perspectives that contribute toward introducing the field of organizational cognition into the domains of the resource-based view and contingency. First, it proposes an ability-based view of the organization through analogies which are most associated with the concepts of the resource-based view and dynamic capabilities of the firm. Second, it proposes a contingency-based view of organizational cognition which is most developed through causal relations and also deductive and inductive reasoning. Grounded in these perspectives, this study sustains the thesis that cognition is a source of controlling environmental uncertainty and, complementarily, cognition contributes toward creating and sustaining the organization’s competitive advantage
Leo IV & V - A possible dwarf galaxy pair ?
The last few years have seen the discovery of many faint and ultra-faint
dwarf spheroidal galaxies around the Milky Way. Among these is a pair of
satellites called Leo IV and Leo V. This pair is found at large distances from
the Milky Way (154 and 175 kpc respectively). The rather small difference in
radial distance, and the fact that they also show a close projected distance on
the sky, has led to the idea that we might be seeing a new pair of bound
galaxies - like the Magellanic Clouds. In this paper we investigate this
speculation by means of a simple integration code (confirming the results with
full N-body simulations). As the luminous mass of both faint dwarfs is far too
low to allow them to be bound, we simulate the pair assuming extended dark
matter haloes. Our results show that the minimum dark matter mass required for
the pair to be bound is rather high - ranging from 1.6 x 10^10 Msun to 5.4 x
10^10 Msun (within the virial radii). Computing the mass of dark matter within
a commonly adopted radius of 300 pc shows that our models are well within the
predicted range of dark matter content for satellites so faint. We therefore
conclude that it could be possible that the two galaxies constitute a bound
pair.Comment: 7 pages, 3 figures, accepted by A&
SIMS chemical analysis of extended impact features from the trailing edge portion of experiment AO187-2
One hundred capture cells from the trailing edge, which had lost their cover foils during flight, were optically scanned for extended impact features caused by high velocity projectiles impinging on the cells while the foils were still intact. Of the 53 candidates, 24 impacts were analyzed by secondary ion mass spectroscopy for the chemical composition of the deposits. Projectile material was found in all impacts, and at least 75 percent of them appear to be caused by interplanetary dust particles. Elemental ratios are fractionated, with refractory elements enriched in the impacts relative to interplanetary dust particles collected in the stratosphere. Although this could be due to systematic differences in the compositions, a more likely explanation is volatility fractionation during the impact process
Segue 2: A Prototype of the Population of Satellites of Satellites
We announce the discovery of a new Milky Way satellite Segue 2 found in the
data of the Sloan Extension for Galactic Understanding and Exploration (SEGUE).
We followed this up with deeper imaging and spectroscopy on the Multiple Mirror
Telescope. From this, we derive a luminosity of M_v = -2.5, a half-light radius
of 34 pc and a systemic velocity of -40$ km/s. Our MMT data also provides
evidence for a stream around Segue 2 at a similar heliocentric velocity, and
the SEGUE data show that it is also present in neighboring fields. We resolve
the velocity dispersion of Segue 2 as 3.4 km/s and the possible stream as about
7 km/s. This object shows points of comparison with other recent discoveries,
Segue 1, Boo II and Coma. We speculate that all four objects may be
representatives of a population of satellites of satellites -- survivors of
accretion events that destroyed their larger but less dense parents. They are
likely to have formed at redshifts z > 10 and are good candidates for fossils
of the reionization epoch.Comment: MNRAS, Submitte
The Baryon Content of Cosmic Structures
We make an inventory of the baryonic and gravitating mass in structures
ranging from the smallest galaxies to rich clusters of galaxies. We find that
the fraction of baryons converted to stars reaches a maximum between M500 =
1E12 and 1E13 Msun, suggesting that star formation is most efficient in bright
galaxies in groups. The fraction of baryons detected in all forms deviates
monotonically from the cosmic baryon fraction as a function of mass. On the
largest scales of clusters, most of the expected baryons are detected, while in
the smallest dwarf galaxies, fewer than 1% are detected. Where these missing
baryons reside is unclear.Comment: ApJ Letters, in pres
Leo V: A Companion of a Companion of the Milky Way Galaxy
We report the discovery of a new Milky Way dwarf spheroidal galaxy in the
constellation of Leo identified in data from the Sloan Digital Sky Survey. Leo
V lies at a distance of about 180 kpc, and is separated by about 3 degrees from
another recent discovery, Leo IV. We present follow-up imaging from the Isaac
Newton Telescope and spectroscopy from the Hectochelle fiber spectrograph at
the Multiple Mirror Telescope. Leo V's heliocentric velocity is 173.4 km/s,
which is offset by about 40 km/s from that of Leo IV. A simple interpretation
of the kinematic data is that both objects may lie on the same stream, though
the implied orbit is only modestly eccentric (e = 0.2)Comment: Submitted to ApJ (Letters
A THEORY OF ORGANIZATIONAL COGNITION:PRINCIPLES AND CONCEPTS
Organizations and the environment change over time. Not only change their structures and processes of functioning, but also the perspectives that researchers have about them over periods of time. Hence, scientists need to review theories of organizations in order to formulate new solutions to the problems of the present. It is in such a direction of thinking that this paper contributes by introducing new concepts, principles and propositions towards a theory of organizational cognition. It put forwards new perspectives about the organization and the environment, and also about the relations between them through the concept of cognition. From these backgrounds, this research also contributes by presenting the concepts of organizational intelligence and autonomy, hierarchic levels of cognition in organizational systems, along with cognitive definitions and complex models for the organization and the environment
Long-lived, long-period radial velocity variations in Aldebaran: A planetary companion and stellar activity
We investigate the nature of the long-period radial velocity variations in
Alpha Tau first reported over 20 years ago. We analyzed precise stellar radial
velocity measurements for Alpha Tau spanning over 30 years. An examination of
the Halpha and Ca II 8662 spectral lines, and Hipparcos photometry was also
done to help discern the nature of the long-period radial velocity variations.
Our radial velocity data show that the long-period, low amplitude radial
velocity variations are long-lived and coherent. Furthermore, Halpha equivalent
width measurements and Hipparcos photometry show no significant variations with
this period. Another investigation of this star established that there was no
variability in the spectral line shapes with the radial velocity period. An
orbital solution results in a period of P = 628.96 +/- 0.90 d, eccentricity, e
= 0.10 +/- 0.05, and a radial velocity amplitude, K = 142.1 +/- 7.2 m/s.
Evolutionary tracks yield a stellar mass of 1.13 +/- 0.11 M_sun, which
corresponds to a minimum companion mass of 6.47 +/- 0.53 M_Jup with an orbital
semi-major axis of a = 1.46 +/- 0.27 AU. After removing the orbital motion of
the companion, an additional period of ~ 520 d is found in the radial velocity
data, but only in some time spans. A similar period is found in the variations
in the equivalent width of Halpha and Ca II. Variations at one-third of this
period are also found in the spectral line bisector measurements. The 520 d
period is interpreted as the rotation modulation by stellar surface structure.
Its presence, however, may not be long-lived, and it only appears in epochs of
the radial velocity data separated by 10 years. This might be due to an
activity cycle. The data presented here provide further evidence of a planetary
companion to Alpha Tau, as well as activity-related radial velocity variations.Comment: 18 pages, 14 figures. Accepted for publication in Astronomy and
Astrophysic
The emerging specialty of perioperative medicine: a UK survey of the attitudes and behaviours of anaesthetists
Background:
In 2014, the Royal College of Anaesthetists (RCoA) launched the Perioperative Medicine Programme to facilitate the delivery of best preoperative, intraoperative and postoperative care through implementation of evidence-based medicine to reduce variation and improve postoperative outcomes. However, variation exists in the establishment of perioperative medicine services in the UK. This survey explored attitudes and behaviours of anaesthetists towards perioperative medicine, described current anaesthetic-led perioperative medicine services across the UK and explored barriers to anaesthetic involvement in perioperative medicine.
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Methods:
Survey content based on the RCoA vision document was refined and validated using an expert panel. An anonymous electronic survey was then sent by email to the members of the RCoA.
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Results:
Seven hundred fifty-eight UK anaesthetists (4.5% of the RCoA mailing list) responded to the survey. Of these, 64% considered themselves a perioperative doctor, with 65% having changed local services in response to the RCoA vision. Barriers to developing perioperative medicine included insufficient time (75%) and inadequate training (51%). Three quarters of respondents advocate anaesthetists leading the development of perioperative medicine.
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Conclusions:
Despite evidence of emerging services, this survey describes barriers to ongoing development of perioperative medicine. Facilitators may include increased clinical exposure, targeted education and training and collaborative working with other specialties
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