منابع مشابه
A Conceptual Data Model of Datum Systems
Traditionally, geometric dimensioning and tolerancing (GD&T) requirements have been exchanged with technical drawings. However, with the advent of computer-aided design, manufacturing, and inspection equipment, the ability to exchange these requirements in a computer-sensible manner has become increasingly more desirable. As “a data model is an effective technique to define the shareable semant...
متن کاملChart Datum for Hydrography
This paper sets out to discuss ongoing activities in the tide and chart datum components of hydrography and charting. It expands on the paper presented at FIG (Fédération Internationale des Géomètres) in Brighton 1998 by Mr Matt Higgins and is a revised and updated version of the paper Chart Datum for Hydrography by GPS delivered by the present authors to the Survey 99 Congress, Sunshine Coast,...
متن کاملDatum Definition Problems in Accelerator Alignment *
Any measurement task requires a fixed reference base (the datum’) from which measurements can be made and calculated. The linac was the datum to which all SLC components were aligned; although this reference existed as a physical object, the actual establishment of the datum and its transferral to datums that were more useful for the SLC installation challenged the technology and computational ...
متن کاملThe ISNT rule and differentiation of normal from glaucomatous eyes.
OBJECTIVE To determine whether the ISNT rule (that normal eyes show a characteristic configuration for disc rim thickness of inferior > or = superior > or = nasal > or = temporal), widely used for clinical evaluation of the optic nerve head, can differentiate normal from glaucomatous eyes. METHODS All subjects underwent complete eye examination, including achromatic automated perimetry, simul...
متن کاملFactors Affecting ISNT Rule Satisfaction in Normal and Glaucomatous Eyes
PURPOSE To determine the factors that influence the satisfaction of the 'ISNT rule' (neural rim width: inferior ≥ superior ≥ nasal ≥ temporal) in normal and glaucomatous eyes. METHODS The medical records of patients that visited Boramae Medical Center, Seoul, Korea, were reviewed. Each group of normal and glaucomatous eyes was divided into subgroups based on whether or not they satisfied the ...
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ژورنال
عنوان ژورنال: Canadian Journal of Surgery
سال: 2016
ISSN: 0008-428X
DOI: 10.1503/cjs.009316