Abstract We provide foundations for a characteristic free study of foliated varieties in terms infinitesimal actions formal groupoids. The ultimate goal is the bi-rational geometry same, and to this end we prove cone theorem foliations curves, together with structure theorems extremal rays, and, course, minimal model surfaces. All possible wild ramification effects Deligne–Mumford champ are bui...

Mammographic risk assessment provides an indication of the likelihood of women developing breast cancer. Anumber ofmammographic image based classification methods have been developed, such as Wolfe, Boyd, BI-RADS and Tabár based assessment. We provide a comparative study of these four approaches. Results on the full MIAS database are presented, which indicate strong correlation (Spearman’s > 0....

Many relations between model elements are expressed in OCL. However, tool support to enable synchronization of elements based on OCL-expressed relations is lacking. In this paper, we propose to use active operations in order to achieve incremental execution of some OCL expressions. Moreover, bidirectionality can also be achieved in non-trivial

This paper demonstrates the existence of bi-directional relationships between interfirm collaboration and business sales. Entry and post-entry collaboration often contribute to superior performance, which in turn attracts more partners. At the same time, though, collaboration may impose constraints on growth opportunities. The relationships vary across types of collaborators and collaborations ...

Th rough their multiple roles in tourism, residents of destination communities interact with tourists at destinations. Th e consequences of these host-guest interactions are bi-directional. Much research has been done on impacts of host-guest interactions on the local community. On the other hand, few studies have evaluated how tourists' on-site behaviour and experiences are aff ected by such i...

The researchers reviewed 1,523 consecutive breast MRI exams performed from Jan. 1, 2003, to June 30, 2005, to identify all lesions initially detected on MRI and assessed as BI-RADS 4 or 5 for which the patient underwent subsequent imaging-guided needle or excisional biopsy. They recorded BI-RADS lesion features for each case and the risk of malignancy was assessed using generalized estimating e...