With a positive outlook for the oil and gas market comes investment in new capital equipment, as well as refurbishment of old equipment to ensure the maximum lifetime value. With rigs operating sometimes 24 hours a day, 7 days a week, the constant wear and fatigue on the equipment causes corrosion, galling threads, ineffective seals, or worse.
In this simple case it will just correspond to a scaling and a permutation. More control over the non-uniqueness of NMF is obtained with sparsity constraints.
NMF has been applied to the spectroscopic observations   and the direct imaging observations  as a method to study the common properties of astronomical objects and post-process the astronomical observations.
Their method is then adopted by Ren et al. In this situation, NMF has been an excellent method, being less over-fitting in the sense of the non-negativity and sparsity of the NMF modeling coefficients, therefore forward modeling can be performed with a few scaling factors,  rather than a computationally intensive data re-reduction on generated models.
Text mining[ edit ] NMF can be used for text mining applications.
In this process, a document-term matrix is constructed with the weights of various terms typically weighted word frequency information from a set of documents. This matrix is factored into a term-feature and a feature-document matrix.
The features are derived from the contents of the documents, and the feature-document matrix describes data clusters of related documents. One specific application used hierarchical NMF on a small subset of scientific abstracts from PubMed.
The algorithm assumes that the topic matrix satisfies a separability condition that is often found to hold in these settings.About us.
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Despite Level 1b evidence and international consensus that exercise is beneficial in ankylosing spondylitis (AS), there is a paucity of detailed information to guide exercise prescription, including the type and dosage of exercise required for the most benefit. Dear Twitpic Community - thank you for all the wonderful photos you have taken over the years.
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