1,286,103 research outputs found
Online Sorting via Searching and Selection
In this paper, we present a framework based on a simple data structure and
parameterized algorithms for the problems of finding items in an unsorted list
of linearly ordered items based on their rank (selection) or value (search). As
a side-effect of answering these online selection and search queries, we
progressively sort the list. Our algorithms are based on Hoare's Quickselect,
and are parameterized based on the pivot selection method.
For example, if we choose the pivot as the last item in a subinterval, our
framework yields algorithms that will answer q<=n unique selection and/or
search queries in a total of O(n log q) average time. After q=\Omega(n) queries
the list is sorted. Each repeated selection query takes constant time, and each
repeated search query takes O(log n) time. The two query types can be
interleaved freely. By plugging different pivot selection methods into our
framework, these results can, for example, become randomized expected time or
deterministic worst-case time. Our methods are easy to implement, and we show
they perform well in practice
Cauchy Annealing Schedule: An Annealing Schedule for Boltzmann Selection Scheme in Evolutionary Algorithms
Boltzmann selection is an important selection mechanism in evolutionary
algorithms as it has theoretical properties which help in theoretical analysis.
However, Boltzmann selection is not used in practice because a good annealing
schedule for the `inverse temperature' parameter is lacking. In this paper we
propose a Cauchy annealing schedule for Boltzmann selection scheme based on a
hypothesis that selection-strength should increase as evolutionary process goes
on and distance between two selection strengths should decrease for the process
to converge. To formalize these aspects, we develop formalism for selection
mechanisms using fitness distributions and give an appropriate measure for
selection-strength. In this paper, we prove an important result, by which we
derive an annealing schedule called Cauchy annealing schedule. We demonstrate
the novelty of proposed annealing schedule using simulations in the framework
of genetic algorithms
Justifying the design and selection of literacy and thinking tools
Criteria for the design and selection of literacy and thinking tools that allow educators to justify what they do are described within a wider framework of learning theory and research into best practice. Based on a meta-analysis of best practice, results from a three year project designed to evaluate the effectiveness of a secondary school literacy initiative in New Zealand, together with recent research from cognitive and neuro-psychologists, it is argued that the design and selection of literacy and thinking tools used in elementary schools should be consistent with (i) teaching focused (ii) learner focused, (iii) thought linked (iv) neurologically consistent, (v) subject specific, (vi) text linked, (vii) developmentally appropriate, and (viii) assessment linked criteria. Key words: Literacy, thinking, tools, justifying criteria
Choosing how to choose : Institutional pressures affecting the adoption of personnel selection procedures
The gap between science and practice in personnel selection is an ongoing concern of human resource management. This paper takes Oliver´s framework of organizations´ strategic responses to institutional pressures as a basis for outlining the diverse economic and social demands that facilitate or inhibit the application of scientifically recommended selection procedures. Faced with a complex network of multiple requirements, practitioners make more diverse choices in response to any of these pressures than has previously been acknowledged in the scientific literature. Implications for the science-practitioner gap are discussed
Penalized Likelihood and Bayesian Function Selection in Regression Models
Challenging research in various fields has driven a wide range of
methodological advances in variable selection for regression models with
high-dimensional predictors. In comparison, selection of nonlinear functions in
models with additive predictors has been considered only more recently. Several
competing suggestions have been developed at about the same time and often do
not refer to each other. This article provides a state-of-the-art review on
function selection, focusing on penalized likelihood and Bayesian concepts,
relating various approaches to each other in a unified framework. In an
empirical comparison, also including boosting, we evaluate several methods
through applications to simulated and real data, thereby providing some
guidance on their performance in practice
Bidirectional branch and bound for controlled variable selection. Part III: local average loss minimization
The selection of controlled variables (CVs) from available measurements through
exhaustive search is computationally forbidding for large-scale processes. We
have recently proposed novel bidirectional branch and bound (B-3) approaches for
CV selection using the minimum singular value (MSV) rule and the local worst-
case loss criterion in the framework of self-optimizing control. However, the
MSV rule is approximate and worst-case scenario may not occur frequently in
practice. Thus, CV selection by minimizing local average loss can be deemed as
most reliable. In this work, the B-3 approach is extended to CV selection based
on local average loss metric. Lower bounds on local average loss and, fast
pruning and branching algorithms are derived for the efficient B-3 algorithm.
Random matrices and binary distillation column case study are used to
demonstrate the computational efficiency of the proposed method
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East Midlands FRESA targets project
Reviewed employment and skills targets in use by organisations in the East Midlands in order to inform the development of targets for the East Midlands Framework for Employment and Skills action (FRESA). Established target development process later adopted by emda for 2006 RES. Developed criteria for applying to future selection of economic performance monitoring metrics - especially for skills, based on extant best practice, such as the Treasury's 'Green Book'
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