27,079 research outputs found
Shelf Ready Processing at Leeds Metropolitan University
Leeds Metropolitan University has been using shelf ready with our two main book suppliers, Coutts and Dawson, for about 10 years
Strange bedfellows? Keyword and conceptual search unite to make sense of relevant ESI in electronic discovery
In the brief history of electronic discovery, the latter part of the twentieth century witnessed the
demise of paper by a digital hero that emancipated the content of paper documents with OCR
and TIFF. This technology added a third dimension to the realm of 2D paper document review
and production that lead to a sea change in discovery methods. By many accounts what we have
before us is a three-stage evolution from paper to digital to clustering in order to overcome the
problems of volume and complexity of ESI. The intent of this position paper is to describe the
development of the digital hero and methodology that is emancipating the content and context of
ESI – conceptual search that spans file formats, languages and technique, and includes keyword
search on a common, shared index
Analytic evaluation of display requirements for approach to landing
A pilot-vehicle-display model is used to study information and display requirements and the effects on system performance and reliability of pilot-induced randomness, wind gusts, configurational changes, etc. A brief description of a control theoretic systems model is given and its use and validity are demonstrated by applying it in a piloted approach to landing situation. The analysis procedure assumes that the vehicle dynamics are represented by linearized equations of motion
A 3D radiative transfer framework IX. Time dependence
Context. Time-dependent, 3D radiation transfer calculations are important for
the modeling of a variety of objects, from supernovae and novae to simulations
of stellar variability and activity. Furthermore, time-dependent calculations
can be used to obtain a 3D radiative equilibrium model structure via relaxation
in time. Aims. We extend our 3D radiative transfer framework to include direct
time dependence of the radiation field; i.e., the
terms are fully considered in the solution of radiative transfer problems.
Methods. We build on the framework that we have described in previous papers in
this series and develop a subvoxel method for the
terms. Results. We test the implementation by comparing the 3D results to our
well tested 1D time dependent radiative transfer code in spherical symmetry. A
simple 3D test model is also presented. Conclusions. The 3D time dependent
radiative transfer method is now included in our 3D RT framework and in
PHOENIX/3D.Comment: A&A in press, 7 pages, 14 figure
Manned Vehicle Systems Analysis by Means of Modern Control Theory
Optimal control theory and systems analysis of man machine systems and operator performance prediction model for compensatory tracking tasks are discussed
Closed loop models for analyzing the effects of simulator characteristics
The optimal control model of the human operator is used to develop closed loop models for analyzing the effects of (digital) simulator characteristics on predicted performance and/or workload. Two approaches are considered: the first utilizes a continuous approximation to the discrete simulation in conjunction with the standard optimal control model; the second involves a more exact discrete description of the simulator in a closed loop multirate simulation in which the optimal control model simulates the pilot. Both models predict that simulator characteristics can have significant effects on performance and workload
Closed loop models for analyzing engineering requirements for simulators
A closed loop analytic model, incorporating a model for the human pilot, (namely, the optimal control model) that would allow certain simulation design tradeoffs to be evaluated quantitatively was developed. This model was applied to a realistic flight control problem. The resulting model is used to analyze both overall simulation effects and the effects of individual elements. The results show that, as compared to an ideal continuous simulation, the discrete simulation can result in significant performance and/or workload penalties
On the Spectrum and Nature of the Peculiar Type Ia Supernova 1991T
A parameterized supernova synthetic-spectrum code is used to study line
identifications in the photospheric-phase spectra of the peculiar Type Ia SN
1991T, and to extract some constraints on the composition structure of the
ejected matter. The inferred composition structure is not like that of any
hydrodynamical model for Type Ia supernovae. Evidence that SN 1991T was
overluminous for an SN Ia is presented, and it is suggested that this peculiar
event probably was a substantially super-Chandrasekhar explosion that resulted
from the merger of two white dwarfs.Comment: 1 text, 7 figures, submitted to MNRA
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