منابع مشابه
Bird flu fears widen
Western Europe is seeing a growing number of cases of H5N1 flu in wild birds that have migrated from the east, but new outbreaks in poultry in Africa threaten the hordes of birds heading north for the summer breeding season. Worries about the disease are likely to grow. The Tower of London's famous ravens are now, for the first time in 400 years, locked up inside the building. The move marks gr...
متن کاملWiden Narrow and Relax
We apply results from linear programming to show that the relaxation of model checking over integers to reals is accurate i e yields a full test of temporal properties for a large class of concurrent systems We de ne abstractions similar to widening and narrowing that accelerate least and greatest xpoint computations in model checking over integers or reals We show that these abstractions are a...
متن کاملStrengthen, Widen, Get Semaphores
Many parallel programs are expressed in terms of conditional atomic actions with different degrees of atomicity. It is known that these synchronization primitives are expensive to implement in its fully generality [2]. Many platforms provide an efficient set of synchronization primitives. Semaphores are a very special case of conditional atomic actions which can be considered a canonical synchr...
متن کاملSimple criteria for finding (nearly) optimal vaccination strategies.
Strategies for best controlling the spread of the diseases with limited vaccine available are explored. I use influenza as a representative disease in point. The model describes the dynamics of influenza spread among multiple groups that have different risks and activity levels. I define a core group consisting of individuals with occupations that brings them in contact with many other people i...
متن کاملFibrinolysis may widen the time window for primary angioplasty.
Recently published clinical trials have demonstrated superiority of primary percutaneous coronary intervention (PPCI) over lysis in ST-elevation myocardial infarction (STEMI) treatment. Current practice guidelines have established PPCI as a preferred method of reperfusion in STEMI, as long as it can be performed within 90 min from patient’s first medical contact. However, in the majority of cas...
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ژورنال
عنوان ژورنال: BMJ
سال: 1994
ISSN: 0959-8138,1468-5833
DOI: 10.1136/bmj.308.6921.131a