منابع مشابه
Computing Iceberg Queries Eeciently
Many applications compute aggregate functions over an attribute (or set of attributes) to nd aggregate values above some speci ed threshold. We call such queries iceberg queries, because the number of abovethreshold results is often very small (the tip of an iceberg), relative to the large amount of input data (the iceberg). Such iceberg queries are common in many applications, including data w...
متن کاملIceberg-capsize tsunamigenesis
Calving from the floating termini of outlet glaciers and ice shelves is just the beginning of an interesting chain of events that can subsequently have important impacts on human life and property. Immediately after calving, many icebergs capsize (roll over by 90◦) due to the instability of their initial geometry. As icebergs melt and respond to the cumulative effects of ocean swell, they can a...
متن کاملComputing Iceberg Queries Efficiently
Many applications compute aggregate functions over an attribute (or set of attributes) to find aggregate values above some specified threshold. We call such queries iceberg queries, because the number of abovethreshold results is often very small (the tip of an iceberg), relative to the large amount of input data (the iceberg). Such iceberg queries are common in many applications, including dat...
متن کاملLocalising iceberg inconsistencies
In artificial intelligence, it is important to handle and analyse inconsistency in knowledge bases. Inconsistent pieces of information suggest questions like “where is the inconsistency?” and “how severe is it?”. Inconsistency measures have been proposed to tackle the latter issue, but the former seems underdeveloped and is the focus of this paper. Minimal inconsistent sets have been the main t...
متن کاملThe Tip of the Iceberg
Rheumatic heart disease (RHD) remains one of the largest preventable burdens of disease in the world. It is perceived as a disease of childhood, acquired by streptococcal throat infection of the tonsillo-pharynx, leading to an inflammatory reaction that involves many organs, including the heart. However, cases in children of 5 to 14 years of age are likely to represent only 15% to 20% of all ca...
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ژورنال
عنوان ژورنال: BMJ
سال: 1981
ISSN: 0959-8138,1468-5833
DOI: 10.1136/bmj.282.6280.1974