5,941 research outputs found
Recommended from our members
Data assurance in opaque computations
The chess endgame is increasingly being seen through the lens of, and therefore effectively defined by, a data ‘model’ of itself. It is vital that such models are clearly faithful to the reality they purport to represent. This paper examines that issue and systems engineering responses to it, using the chess endgame as the exemplar scenario. A structured survey has been carried out of the intrinsic challenges and complexity of creating endgame data by reviewing the past pattern of errors during work in progress, surfacing in publications and occurring after the data was generated. Specific measures are proposed to counter observed classes of error-risk, including a preliminary survey of techniques for using state-of-the-art verification tools to generate EGTs that are correct by construction. The approach may be applied generically beyond the game domain
CD-ROM preparation: An overview and guide
A primer on the options and procedures involved in producing CD-ROM products in a small to medium sized business operation is presented in language that persons with a minimal technical background can easily understand. The capabilities, limitations, and standards of CD-ROM technology are surveyed. Emphasis is placed on CD-ROM production, especially upon design, data conversion to an electronic medium, data file preparation, the use of vendors, and the steps for in-house production of CD-ROM products
Recommended from our members
Exploiting CAFS-ISP
In the summer of 1982, the ICLCUA CAFS Special Interest Group defined three subject areas for working party activity. These were: 1) interfaces with compilers and databases, 2) end-user language facilities and display methods, and 3) text-handling and office automation. The CAFS SIG convened one working party to address the first subject with the following terms of reference: 1) review facilities and map requirements onto them, 2) "Database or CAFS" or "Database on CAFS", 3) training needs for users to bridge to new techniques, and 4) repair specifications to cover gaps in software. The working party interpreted the topic broadly as the data processing professional's, rather than the end-user's, view of and relationship with CAFS. This report is the result of the working party's activities. The report content for good reasons exceeds the terms of reference in their strictest sense. For example, we examine QUERYMASTER, which is deemed to be an end-user tool by ICL, from both the DP and end-user perspectives. First, this is the only interface to CAFS in the current SV201. Secondly, it is necessary for the DP department to understand the end-user's interface to CAFS. Thirdly, the other subjects have not yet been addressed by other active working parties
Transport of magnetic flux and the vertical structure of accretion discs: I. Uniform diffusion coefficients
The evolution of a large-scale poloidal magnetic field in accretion discs is
an important problem because of its role in the launching of jets and winds and
in determining the intensity of turbulence. In this paper, we develop a
formalism to calculate the transport magnetic flux in a thin accretion disc,
thus determining its evolution on a viscous/resistive timescale. The governing
equations are derived by performing an asymptotic expansion in the limit of a
thin disc, in the regime where the magnetic field is dominated by its vertical
component. Turbulent viscosity and resistivity are included, with an arbitrary
vertical profile that can be adjusted to mimic the vertical structure of the
turbulence. At a given radius and time, the rates of transport of mass and
magnetic flux are determined by a one-dimensional problem in the vertical
direction, in which the radial gradients of various quantities appear as source
terms. We solve this problem to obtain the transport rates and the vertical
structure of the disc. The present paper is then restricted to the idealised
case of uniform diffusion coefficients, while a companion paper will study more
realistic vertical profiles of these coefficients. We show the advection of
weak magnetic fields to be significantly faster than the advection of mass,
contrary to what a crude vertical averaging might suggest. This results from
the larger radial velocities away from the mid-plane, which barely affect the
mass accretion owing to the low density in these regions but do affect the
advection of magnetic flux. Possible consequences of this larger accretion
velocity include a potentially interesting time-dependence with the magnetic
flux distribution evolving faster than the mass distribution. If the disc is
not too thin, this fast advection may also partially solve the long-standing
problem of too efficient diffusion of an inclined magnetic field.Comment: 23 pages, 14 figures, accepted for publication in MNRA
Special Libraries, Spring 1995
Volume 86, Issue 2https://scholarworks.sjsu.edu/sla_sl_1995/1001/thumbnail.jp
Telecommunications media for the delivery of educational programming
The technical characteristics of various telecommunications media are examined for incorporation into educational networks. FM radio, AM radio, and VHF and UHF television are considered along with computer-aided instruction. The application of iteration networks to library systems, and microform technology are discussed. The basic principles of the communications theory are outlined, and the operation of the PLATO 4 random access system is described
Special Libraries, December 1964
Volume 55, Issue 10https://scholarworks.sjsu.edu/sla_sl_1964/1009/thumbnail.jp
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