253,774 research outputs found
Analyzing Inefficiency Using a Frontier Search Approach
Efficiency measurement naturally requires the definition of a frontier as a benchmark indicating efficiency. Usually a measure reflecting the distance of a data point to the frontier indicates the level of efficiency. One of the crucial characteristics to distinguish efficiency measurement tools is the way in which they construct the frontier. The class of deterministic and non parametric tools of constructing the frontier mainly comprises of tools associated with Data Envelopment Analysis. Coming in various flavors all DEA frontiers suffer of their piecewise construction giving rise to numerous vertices. Those vertices do not allow convenient analysis of the frontier properties such as computing elasticities and the like. In this paper we want to contribute to the class of deterministic and non parametric tools of constructing the frontier in an one output and n input setting. We suggest a new empirical approach drawing on functional search in the fashion of Koza's (1992) genetic programming. The frontier search algorithm employed evolves the functional form of the frontier and the parameters simultaneously. The frontier exhibits the neat property that it is smooth and differentiable enabling the computation of elasticities,for example. In particular we introduce both the idea and the algorithm of the frontier search procedure. We discuss the advantages and shortcomings with respect to empirical problems. The arguments brought forth in the preceding sections are illustrated by the investigation of an artificial example.
Fundamental Symmetries of the Early Universe and the Precision Frontier
The search for the next Standard Model of fundamental interactions is being
carried out at two frontiers: the high energy frontier involving the Tevatron
and Large Hadron Collider, and the high precision frontier where the focus is
largely on low energy experiments. I discuss the unique and powerful window on
new physics provided by the precision frontier and its complementarity to the
information we hope to gain from present and future colliders.Comment: Proceedings of CIPANP 2009; 9 pages, 1 figur
The Lifetime Frontier: Search for New Physics with Long-Lived Particles
The search for new physics with long-lived particles is an ongoing and
thriving effort in the High Energy Physics community which necessitates new
search strategies such as novel algorithms, novel detectors, etc...For these
reasons, one could perhaps add another frontier, the Lifetime Frontier, to the
standard three (Energy, Intensity and Cosmic). In this talk, I will describe a
BSM physics model whose characteristic signatures are decays of new (mirror)
fermions at displaced vertices, a domain belonging to the Lifetime Frontier. It
is a model of {\em non-sterile} right-handed neutrinos whose masses are
proportional to the electroweak scale . The model
proposed a solution to the strong CP problem with a surprising connection
between the sizes of the neutrino masses and the -angle which
contributes to the neutron electric dipole moment.Comment: 6 pages, 3 figures, contribution to the 2019 EW/QCD/Gravitation
session of the 54th Rencontres de Morion
Innovation and export portfolios
This paper examines the link between sectoral concentration and overall performance in the search for on-the-frontier innovations, inside-the-frontier innovations, and export booms. It extends the literature by increasing country coverage and the types of search processes considered, and by focusing on the links with overall performance in these search processes. After controlling for the necessary relationships as well as fixed effects at the country/commodity group level, the paper finds a clear negative relationship between the concentration of innovation portfolios and performance: countries that are the most successful in these search processes have their successes spread across a broader range of industries than those with poorer performance. Furthermore, the search for export booms exhibits the least amount of sectoral concentration and path-dependence. These findings suggest that public support for these processes need not be focused in a narrow range of sectors, and modeling of these processes in theoretical work, particularly in the search for export booms, should be of a stochastic flavor.Education for Development (superceded),Economic Theory&Research,Innovation,Achieving Shared Growth,Technology Industry
Approximating Pareto frontier using a hybrid line search approach
This is the post-print version of the final paper published in Information Sciences. The published article is available from the link below. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. Copyright @ 2010 Elsevier B.V.The aggregation of objectives in multiple criteria programming is one of the simplest and widely used approach. But it is well known that this technique sometimes fail in different aspects for determining the Pareto frontier. This paper proposes a new approach for multicriteria optimization, which aggregates the objective functions and uses a line search method in order to locate an approximate efficient point. Once the first Pareto solution is obtained, a simplified version of the former one is used in the context of Pareto dominance to obtain a set of efficient points, which will assure a thorough distribution of solutions on the Pareto frontier. In the current form, the proposed technique is well suitable for problems having multiple objectives (it is not limited to bi-objective problems) and require the functions to be continuous twice differentiable. In order to assess the effectiveness of this approach, some experiments were performed and compared with two recent well known population-based metaheuristics namely ParEGO and NSGA II. When compared to ParEGO and NSGA II, the proposed approach not only assures a better convergence to the Pareto frontier but also illustrates a good distribution of solutions. From a computational point of view, both stages of the line search converge within a short time (average about 150 ms for the first stage and about 20 ms for the second stage). Apart from this, the proposed technique is very simple, easy to implement and use to solve multiobjective problems.CNCSIS IDEI 2412, Romani
The motivation and status of two-body resonance decays after the LHC Run 2 and beyond
Searching for two-body resonance decays is a central component of the high
energy physics energy frontier research program. While many of the
possibilities are covered when the two bodies are Standard Model (SM)
particles, there are still significant gaps. If one or both of the bodies are
themselves non-SM particles, there is very little coverage from existing
searches. We review the status of two-body searches and motivate the need to
search for the missing combinations. It is likely that the search program of
the future will be able to cover all possibilities with a combination of
dedicated and model agnostic search approaches.Comment: 17 pages, 1 figure, 14 table
Future Muon Dipole Moment Measurements
From the famous experiments of Stern and Gerlach to the present, measurements
of magnetic dipole moments, and searches for electric dipole moments of
``elementary'' particles have played a major role in our understanding of
sub-atomic physics. In this talk I discuss the progress on measurements and
theory of the magnetic dipole moment of the muon. I also discuss a new proposal
to search for a permanent electric dipole moment (EDM) of the muon and put it
into the more general context of other EDM searches. These experiments, along
with searches for the lepton flavor violating decays and
, provide a path to the high-energy frontier through
precision measurements.Comment: 9 pages, 8 figures, invited talk at the High Intensity Frontier
Workshop 2004, Isola d'Elb
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