- Full text PDF available (33)
1. ABSTRACT Model-oriented generalization modifies the internal representation of a map to make it simpler. We present a layered library supporting this task, based on a separation of the to-pological, metric and semantic aspects of maps. We outIine the theoretical framework of our approach, and describe the main structure of its software layers.
The glucose-6-phosphate dehydrogenase (G6PD) enzyme activity was determined in 299 Northern Sardinian patients with cholelithiasis. Sixteen (12.80%) of the 125 male patients studied were G6PD deficient; 33 (18.96%) of the 174 females were heterozygous and 1 (0.57%) homozygous. Thus, the prevalence of G6PD deficiency in male subjects with cholelithiasis is… (More)
BACKGROUND Combination therapy with pegylated interferon (peginterferon) plus ribavirin is associated with several side effects, including neutropenia and infection. AIMS To evaluate the incidence of neutropenia and infection between all consecutive patients with hepatitis C who were treated in two centers with peginterferon-alfa-2a and… (More)
Angiodysplasia of the gastrointestinal tract is a disorder consisting of ectasia of submucosal and mucosal vessels, which causes acute and chronic bleeding. We describe the case of a 58-year-old man with a history of recurrent lower intestinal bleeding and severe anemia. Endoscopy and X-ray examination of the gastrointestinal tract failed to show the source… (More)
BACKGROUND Recurrence of adrenal cortical carcinoma (ACC) after radical surgery is a common finding. Although successful reoperations have been reported with encouraging results, most published experiences are anecdotal and based on few cases. We report the results of surgical treatment for recurrent ACC in a multiinstitutional series. METHODS One hundred… (More)
Topological and metric aspects of the multiresolution representation of geographic maps are considered. The combinatorial structure of maps is mathematically modelled through abstract cell complexes, and maps at diierent detail are related through continuous functions over such complexes. Metric aspects of multiresolution are controlled through the concept… (More)
In this paper we discuss how to define in a mathematical framework the set of operations that cartographers call generalization. First we make a clear distinction between topological and metric aspects of maps, and describe suitable mathematical tools for treating both cathegories. Then we analyse the basic operations of generalization, pointing out whether… (More)