11,509 research outputs found
The Buffered \pi-Calculus: A Model for Concurrent Languages
Message-passing based concurrent languages are widely used in developing
large distributed and coordination systems. This paper presents the buffered
-calculus --- a variant of the -calculus where channel names are
classified into buffered and unbuffered: communication along buffered channels
is asynchronous, and remains synchronous along unbuffered channels. We show
that the buffered -calculus can be fully simulated in the polyadic
-calculus with respect to strong bisimulation. In contrast to the
-calculus which is hard to use in practice, the new language enables easy
and clear modeling of practical concurrent languages. We encode two real-world
concurrent languages in the buffered -calculus: the (core) Go language and
the (Core) Erlang. Both encodings are fully abstract with respect to weak
bisimulations
Intermediate-pressure phases of cerium studied by an LDA + Gutzwiller method
The thermodynamic stable phase of cerium metal in the intermediate pressure
regime (5.0--13.0 GPa) is studied in detail by the newly developed
local-density approximation (LDA)+ Gutzwiller method, which can include the
strong correlation effect among the 4\textit{f} electrons in cerium metal
properly. Our numerical results show that the phase, which has the
distorted body-centered-tetragonal structure, is the thermodynamic stable phase
in the intermediate pressure regime and all the other phases including the
phase (-U structure), phase (fcc structure), and bct
phases are either metastable or unstable. Our results are quite consistent with
the most recent experimental data.Comment: 17 pages, 7 figure
On a one-dimensional optimization problem derived from the efficiency analysis of Newton-PCG-like algorithms
AbstractThe Newton-PCG (preconditioned conjugate gradient) like algorithms are usually very efficient. However, their efficiency is mainly supported by the numerical experiments. Recently, a new kind of Newton-PCG-like algorithms is derived in (J. Optim. Theory Appl. 105 (2000) 97; Superiority analysis on truncated Newton method with preconditioned conjugate gradient technique for optimization, in preparation) by the efficiency analysis. It is proved from the theoretical point of view that their efficiency is superior to that of Newton's method for the special cases where Newton's method converges with precise Q-order 2 and α(⩾2), respectively. In the process of extending such kind of algorithms to the more general case where Newton's method has no fixed convergence order, the first is to get the solutions to the one-dimensional optimization problems with many different parameter values of α. If these problems were solved by numerical method one by one, the computation cost would reduce the efficiency of the Newton-PCG algorithm, and therefore is unacceptable. In this paper, we overcome the difficulty by deriving an analytic expression of the solution to the one-dimensional optimization problem with respect to the parameter α
The Accounting Methods of the Local Government Department Output by Factor Analysis
In this paper, using the 2011 national economic accounting data of the provinces, we evaluated the government department performance by factor analysis. And then calculated the local government department's total output taking advantage of the labor production efficiency. And the labor production efficiency of government department concludes the performance information. Which will improved the method of accounting government department's output by cost
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