system with all ten properties (property (7) follows from (l)-(3))we consider it as a system with double composition in which the fundamental operations are multiplication and an operation + defined by the equation a + b = (a Ab) Aab. If we introduce also the operation ' defined by the equation a' = a Ae, we easily deduce the following properties: (a)a+b = b+a; (G )a+(b+c) = (a+b) +c; (7y)ab = ...

A decomposition of a read text into a succession of interstress intervals reveals basic structures of stress timing and stress distribution within a sentence and is the bases for analysis of quasi-rhythmical phenomena, speech tempo, and reading style. In a case study, we describe how stress foot statistics may be adopted for the analysis of various reading modes such as normal, low voice effort...

Received 16 December 1991. Revised version accepted 7 February 1992. Familial adenomatous polyposis (FAP) is a dominantly inherited condition which predisposes family members to the development of colorectal carcinoma, usually in their thirties. Carcinoma is preceded by the development of widespread adenomatous polyps in the large bowel, and this feature has been used as a diagnostic marker for...

A generalization of interval graph is introduced for cosmid contig mapping of DNA. A graph is a tagged probe interval graph if its vertex set can be partitioned into two subsets of probes and nonprobes, and a closed interval can be assigned to each vertex such that two vertices are adjacent if and only if at least one of them is a probe and one end of its corresponding interval is contained in ...

2 Frequency of Exacerbations in Patients with Chronic Obstructive Pulmonary Disease: An Analysis of the SPIROMICS Cohort BACKGROUND: Present treatment strategies to stratify exacerbation risk in patients with chronic obstructive pulmonary disease (COPD) rely on a history of two or more events in the previous year. We aimed to understand year to year variability in exacerbations and factors asso...