2,005 research outputs found
Development and Evaluation of the Nebraska Assessment of Computing Knowledge
One way to increase the quality of computing education research is to increase the quality of the measurement tools that are available to researchers, especially measures of students’ knowledge and skills. This paper represents a step toward increasing the number of available thoroughly-evaluated tests that can be used in computing education research by evaluating the psychometric properties of a multiple-choice test designed to differentiate undergraduate students in terms of their mastery of foundational computing concepts. Classical test theory and item response theory analyses are reported and indicate that the test is a reliable, psychometrically-sound instrument suitable for research with undergraduate students. Limitations and the importance of using standardized measures of learning in education research are discussed
EDPS 870: Introduction to Educational and Psychological Measurement—A Peer Review of Teaching Project Benchmark Portfolio
This portfolio was compiled at the completion of the Peer Review of Teaching Project, professional development available to faculty at the University of Nebraska-Lincoln. The purpose of the project is to support faculty in evaluating and documenting the effectiveness of their teaching. The main objective of this portfolio is to summarize the results of my participation in the project during the 2015/2016 academic year. The portfolio summarizes key features of the course and my teaching methods, along with examples of student work
equate: An R Package for Observed-Score Linking and Equating
The R package equate contains functions for observed-score linking and equating under single-group, equivalent-groups, and nonequivalent-groups with anchor test(s) designs. This paper introduces these designs and provides an overview of observed-score equating with details about each of the supported methods. Examples demonstrate the basic functionality of the equate package
EDPS 870: Introduction to Educational and Psychological Measurement—A Peer Review of Teaching Project Benchmark Portfolio
This portfolio was compiled at the completion of the Peer Review of Teaching Project, professional development available to faculty at the University of Nebraska-Lincoln. The purpose of the project is to support faculty in evaluating and documenting the effectiveness of their teaching. The main objective of this portfolio is to summarize the results of my participation in the project during the 2015/2016 academic year. The portfolio summarizes key features of the course and my teaching methods, along with examples of student work
Metastability in Monte Carlo simulation of 2D Ising films and in Fe monolayer strips
Effective Curie temperatures measured in Fe monolayer strips agree reasonable
with computer sinulations of two-dimensional Ising model strips. The
simulations confirm the domain structure seen already by Albano et al.Comment: 3 pages, plain tex, 5 postscript figure
Study of the one-dimensional off-lattice hot-monomer reaction model
Hot monomers are particles having a transient mobility (a ballistic flight)
prior to being definitely absorbed on a surface. After arriving at a surface,
the excess energy coming from the kinetic energy in the gas phase is dissipated
through degrees of freedom parallel to the surface plane. In this paper we
study the hot monomer-monomer adsorption-reaction process on a continuum
(off-lattice) one-dimensional space by means of Monte Carlo simulations. The
system exhibits second-order irreversible phase transition between a reactive
and saturated (absorbing) phases which belong to the directed percolation (DP)
universality class. This result is interpreted by means of a coarse-grained
Langevin description which allows as to extend the DP conjecture to transitions
occurring in continuous media.Comment: 13 pages, 5 figures, final version to appear in J. Phys.
Conchoidal transform of two plane curves
The conchoid of a plane curve is constructed using a fixed circle in
the affine plane. We generalize the classical definition so that we obtain a
conchoid from any pair of curves and in the projective plane. We
present two definitions, one purely algebraic through resultants and a more
geometric one using an incidence correspondence in \PP^2 \times \PP^2. We
prove, among other things, that the conchoid of a generic curve of fixed degree
is irreducible, we determine its singularities and give a formula for its
degree and genus. In the final section we return to the classical case: for any
given curve we give a criterion for its conchoid to be irreducible and we
give a procedure to determine when a curve is the conchoid of another.Comment: 18 pages Revised version: slight title change, improved exposition,
fixed proof of Theorem 5.3 Accepted for publication in Appl. Algebra Eng.,
Commun. Comput
Optimization of the transmission of observable expectation values and observable statistics in Continuous Variable Teleportation
We analyze the statistics of observables in continuous variable quantum
teleportation in the formalism of the characteristic function. We derive
expressions for average values of output state observables in particular
cumulants which are additive in terms of the input state and the resource of
teleportation. Working with Squeezed Bell-like states, which may be optimized
in a free parameter for better teleportation performance we discuss the
relation between resources optimal for fidelity and for different observable
averages. We obtain the values of the free parameter which optimize the central
momenta and cumulants up to fourth order. For the cumulants the distortion
between in and out states due to teleportation depends only on the resource. We
obtain optimal parameters for the second and fourth order cumulants which do
not depend on the squeezing of the resource. The second order central momenta
which is equal to the second order cumulants and the photon number average are
optimized by the same resource. We show that the optimal fidelity resource,
found in reference (Phys. Rev. A {\bf 76}, 022301 (2007)) to depend also on the
characteristics of input, tends for high squeezing to the resource which
optimizes the second order momenta. A similar behavior is obtained for the
resource which optimizes the photon statistics which is treated here using the
sum of the squared differences in photon probabilities of input and output
states as the distortion measure. This is interpreted to mean that the
distortions associated to second order momenta dominates the behavior of the
output state for large squeezing of the resource. Optimal fidelity and optimal
photon statistics resources are compared and is shown that for mixtures of Fock
states they are equivalent.Comment: 25 pages, 11 figure
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