257,705 research outputs found
Particle swarm optimization with sequential niche technique for dynamic finite element model updating
Peer reviewedPostprin
Strategy management through quantitative modelling of performance measurement systems
This paper is based on previous works on performance measurement and on quantification of relationships between factors which affect performance. It demonstrates how tools and techniques developed can be used to evaluate the performance of alternative strategic choices through a quantitative approach to modelling of performance measurement systems. The paper provides a brief background to the research problem and preceding works. The tools and techniques used are briefly introduced. Use of these tools and techniques to evaluate the performance of alternative manufacturing strategies is demonstrated. Finally, the capability of the approach to deal with dynamic environments is demonstrated using sensitivity analysis
A Survey on Economic-driven Evaluations of Information Technology
The economic-driven evaluation of information technology (IT) has become an important instrument in the management of IT projects. Numerous approaches have been developed to quantify the costs of an IT investment and its assumed profit, to evaluate its impact on business process performance, and to analyze the role of IT regarding the achievement of enterprise objectives. This paper discusses approaches for evaluating IT from an economic-driven perspective. Our comparison is based on a framework distinguishing between classification criteria and evaluation criteria. The former allow for the categorization of evaluation approaches based on their similarities and differences. The latter, by contrast, represent attributes that allow to evaluate the discussed approaches. Finally, we give an example of a typical economic-driven IT evaluation
Electroweak precision measurements and collider probes of the Standard Model with large extra dimensions
The elementary particles of the Standard Model may live in more than 3+1
dimensions. We study the consequences of large compactified dimensions on
scattering and decay observables at high-energy colliders. Our analysis
includes global fits to electroweak precision data, indirect tests at
high-energy electron-positron colliders (LEP2 and NLC), and direct probes of
the Kaluza-Klein resonances at hadron colliders (Tevatron and LHC). The present
limits depend sensitively on the Higgs sector, both the mass of the Higgs boson
and how many dimensions it feels. If the Higgs boson is trapped on a 3+1
dimensional wall with the fermions, large Higgs masses (up to 500 GeV) and
relatively light Kaluza-Klein mass scales (less than 4 TeV) can provide a good
fit to precision data. That is, a light Higgs boson is not necessary to fit the
electroweak precision data, as it is in the Standard Model. If the Higgs boson
propagates in higher dimensions, precision data prefer a light Higgs boson
(less than 260 GeV), and a higher compactification scale (greater than 3.8
TeV). Future colliders can probe much larger scales. For example, a 1.5 TeV
electron-positron linear collider can indirectly discover Kaluza-Klein
excitations up to 31 TeV if 500 fb^-1 integrated luminosity is obtained.Comment: 29 pages, LaTe
Prospect for Charge Current Neutrino Interactions Measurements at the CERN-PS
Tensions in several phenomenological models grew with experimental results on
neutrino/antineutrino oscillations at Short-Baseline (SBL) and with the recent,
carefully recomputed, antineutrino fluxes from nuclear reactors. At a
refurbished SBL CERN-PS facility an experiment aimed to address the open issues
has been proposed [1], based on the technology of imaging in ultra-pure
cryogenic Liquid Argon (LAr). Motivated by this scenario a detailed study of
the physics case was performed. We tackled specific physics models and we
optimized the neutrino beam through a full simulation. Experimental aspects not
fully covered by the LAr detection, i.e. the measurements of the lepton charge
on event-by-event basis and their energy over a wide range, were also
investigated. Indeed the muon leptons from Charged Current (CC) (anti-)neutrino
interactions play an important role in disentangling different phenomenological
scenarios provided their charge state is determined. Also, the study of muon
appearance/disappearance can benefit of the large statistics of CC muon events
from the primary neutrino beam. Results of our study are reported in detail in
this proposal. We aim to design, construct and install two Spectrometers at
"NEAR" and "FAR" sites of the SBL CERN-PS, compatible with the already proposed
LAr detectors. Profiting of the large mass of the two Spectrometers their
stand-alone performances have also been exploited.Comment: 70 pages, 38 figures. Proposal submitted to SPS-C, CER
Identification of indirect new physics effects at e^+e^- colliders: the large extra dimensions case
We discuss indirect manifestations of graviton exchange, predicted by large
extra dimensions, in fermion-pair production at a high-energy e^+e^- collider.
By means of specifically defined asymmetries among integrated angular
distributions, the graviton exchange signal can be cleanly distinguished from
the effects of either vector-vector contact interactions or heavy scalar
exchanges. The role of initial electron and positron beams polarization is also
discussed. The method is applied to a quantitative assessment of the
sensitivity to the mass cut-off parameter M_H of the KK graviton tower in the
ADD scenario, and of the potential identification reach of this mechanism
obtainable at the currently planned Linear Collider.Comment: 21 pages, 11 figure
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