We develop a patent analysis approach to discover types of IT innovations and examine their technological and economic impacts. Our empirical investigation is based on 73,120 patents in the medical devices industry filed between 1996 and 2005. Rather than relying on pre-established classifications of IT innovations, we apply textual analysis to patent abstracts and map the extracted IT innovati...

Isolated hand paresis is a rare presentation of stroke, which mostly results from a lesion in the cortical hand motor area, a knob-like area within the precentral gyrus. I report the case of a patient who experienced recurrent ischemic stroke alternately involving bilateral hand knob areas, causing isolated hand paresis. There was no abnormal finding on brain and neck magnetic resonance angiogr...

Recent years have seen a growing interest in research into patent retrieval. One of the key issues in conducting information retrieval (IR) research is meaningful evaluation of the effectiveness of the retrieval techniques applied to task under investigation. Unlike many existing well explored IR tasks where the focus is on achieving high retrieval precision, patent retrieval is to a significan...

The economics of recombinant knowledge is a promising field of investigation. New technological systems emerge when strong cores of complementary knowledge consolidate and feed an array of coherent applications and implementations. However, diminishing returns to recombination eventually emerge, and the rates of growth of technological systems gradually decline. Empirical evidence based on anal...

THE INVESTIGATION DESCRIBED A series of 73 patients with patent ductus is described, of whom 71 were selected for surgical treatment, while the two remaining patients had complicating severe pulmonary hypertension with a right-to-left shunt. The diagnosis of patent ductus was confirmed at operation in 71 patients. In the two patients with pulmonary hypertension, who were not treated by operatio...

This paper investigates patterns of industrial dynamics and competition in the pharmaceutical industry, with particular reference to the consequences of patent expiry in different countries. We focus on the competition at the level of single chemical entities, distinguishing between original brands and generic products. Quarterly data, spanning from July 1987 to December 1998, on sales of pharm...