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Fine-grain loop scheduling for MIMD machines
Previous algorithms for parallelizing loops on MIMD machines have been based on assigning one or more loop iterations to each processor, introducing synchronization as required. These methods exploit only iteration level parallelism, and ignore the parallelism that may exist at a lower level.In order to exploit parallelism both within and across iterations, our algorithm analyzes and schedules the loop at the statement level. The loop schedule reflects the expected communication and synchronization costs of the target machine. We provide test results that show that this algorithm can produce good speedup of loops on an MIMD machine
Embedding for a 3D World Spinor Equation
A generic-curved spacetime Dirac-like equation in 3D is constructed. It has,
owing to the group deunitarizing automorphism, a physically
correct unitarity and flat spacetime particle properties. The construction is
achieved by embedding vector operator , that plays a
role of Dirac's matrices, into . Decomposition of
the unitary irreducible spinorial representations gives rise to
an explicit form of the infinite matrices
Vertex correction and Ward identity in the U(1) gauge theory with Fermi surface
We show that introduction of vertex corrections in the fully self-consistent
ladder approximation does not modify dynamics of spinons and gauge fluctuations
in the U(1) gauge theory with Fermi surface
Time Dependent Quark Masses and Big Bang Nucleosynthesis Revisited
We reinvestigate the constraints from primordial nucleosynthesis on a
possible time-dependent quark mass. The limits on such quark-mass variations
are particularly sensitive to the adopted observational abundance constraints.
Hence, in the present study we have considered updated light-element abundances
and uncertainties deduced from observations. We also consider new nuclear
reaction rates and an independent analysis of the influence of such quark-mass
variations on the resonance properties of the important 3He(d,p)4He reaction.
We find that the updated abundance and resonance constraints imply a narrower
range on the possible quark-mass variations in the early universe. We also find
that, contrary to previous investigations, the optimum concordance region
reduces to a (95% C.L.) value of -0.005 < delta m_q/m_q < 0.007 consistent with
no variation in the averaged quark mass.Comment: 9 pages, 2 figures, analytic formulae of D and 4He abundances as well
as standard BBN prediction added, discussion on the 6Li production added,
minor errors fixed, accepted for publication in PR
Earnings and Dividend Announcements is there a Corroboration Effect?
We examine abnormal stock returns surrounding contemporaneous earnings and dividend announcements in order to determine whether investors evaluate the two announcements in relation to each other.We find that there is a statistically significant interaction effect.The abnormal return corresponding to any earnings or dividend announcement depends upon the value of the other announcement. This evidence suggests the existence of a corroborative relationship between the two announcements. Investors give more credence to unanticipated dividend increases or decreases when earnings are also above or below expectations, and vice versa.
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