1,274 research outputs found
A fully Distributed Parallel Global Search Algorithm
The n-dimensional direct search algorithm DIRECT of Jones,Perttunen, and Stuckman has attracted recent attention from the multidisciplinary design optimization community. Since DIRECT only requires function values (or ranking)and balances global exploration with local refinement better than n-dimensional bisection, it is well suited to the noisy function values typical of realistic simulations. While not efficient for high accuracy optimization, DIRECT is appropriate for the sort of global design space exploration done in large scale engineering design. Direct and pattern search schemes have the potential to exploit massive parallelism, but efficient use of massively parallel machines is nontrivial to achieve. This paper presents a fully distribute control version of DIRECT that is designed for massively parallel (distribute memory architectures. Parallel results are presented for a multidisciplinary design optimization problem — configuration design of a high speed civil transport
A Domain-Specific Language for Generating Dataflow Analyzers
Dataflow analysis is a well-understood and very powerful technique for analyzing programs as part of the compilation process. Virtually all compilers use some sort of dataflow analysis as part of their optimization phase. However, despite being well-understood theoretically, such analyses are often difficult to code, making it difficult to quickly experiment with variants. To address this, we developed a domain-specific language, Analyzer Generator (AG), that synthesizes dataflow analysis phases for Microsoft's Phoenix compiler framework. AG hides the fussy details needed to make analyses modular, yet generates code that is as efficient as the hand-coded equivalent. One key construct we introduce allows IR object classes to be extended without recompiling. Experimental results on three analyses show that AG code can be one-tenth the size of the equivalent handwritten C++ code with no loss of performance. It is our hope that AG will make developing new dataflow analyses much easier
Unilateral coercive measures in the doctrine of modern international law
The main purpose of this article was to study the theoretical foundations of the application of unilateral coercive measures by states. It was determined that these measures are not consistent with all the fundamental international legal principles. The author indicates that such measures have a wide range of actions and can be both economic and non-economic by nature. The terminological problem of the concept of “unilateral coercive measures” is considered. These measures are often mistakenly referred to as “sanctions”, thereby identifying them with unquestionably legitimate measures taken by the United Nations Security Council. In the legislation of the Russian Federation, unlike other states, there was no confusion of concepts. The article notes that the issue of the legality of the use of unilateral coercive measures is relevant. The fact is that these measures, among other things, can negatively affect the lives of innocent citizens. The most vulnerable segments of society are particularly affected by this, for example, due to the denial of access to essential goods. For this reason, unilateral coercive measures taken by a state should not create any serious violations of people’s fundamental rights. In addition, due to their specific nature, unilateral coercive measures affect the economic processes of states
THE 1996 FARM BILL: IMPLICATIONS FOR RURAL COMMUNITIES
Agricultural and Food Policy,
Dynamical Mean-Field Theory within the Full-Potential Methods: Electronic structure of Ce-115 materials
We implemented the charge self-consistent combination of Density Functional
Theory and Dynamical Mean Field Theory (DMFT) in two full-potential methods,
the Augmented Plane Wave and the Linear Muffin-Tin Orbital methods. We
categorize the commonly used projection methods in terms of the causality of
the resulting DMFT equations and the amount of partial spectral weight
retained. The detailed flow of the Dynamical Mean Field algorithm is described,
including the computation of response functions such as transport coefficients.
We discuss the implementation of the impurity solvers based on hybridization
expansion and an analytic continuation method for self-energy. We also derive
the formalism for the bold continuous time quantum Monte Carlo method. We test
our method on a classic problem in strongly correlated physics, the
isostructural transition in Ce metal. We apply our method to the class of heavy
fermion materials CeIrIn_5, CeCoIn_5 and CeRhIn_5 and show that the Ce 4f
electrons are more localized in CeRhIn_5 than in the other two, a result
corroborated by experiment. We show that CeIrIn_5 is the most itinerant and has
a very anisotropic hybridization, pointing mostly towards the out-of-plane In
atoms. In CeRhIn_5 we stabilized the antiferromagnetic DMFT solution below 3K,
in close agreement with the experimental N\'eel temperature.Comment: The implementation of Bold-CTQMC added and some test of the method
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After the Conservation Reserve Program: Land Management with Wildlife in Mind
4 pp., 4 photosWhen contracts for the Conservation Reserve Program expire, landowners must find profitable ways to manage their properties. These management decisions affect wildlife and habitat. Former CRP land can be returned to crop or livestock production and still be managed to benefit wildlife, and wildlife enterprises themselves can be viable options
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