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Deductive object bases attempt to combine the advantages of deductive relational databases with those of object-oriented databases. We review modeling and implementation issues encountered during the development of ConceptBase, a prototype deductive object manager supporting the Telos object model. Significant features include: I) The symmetric treatment of(More)
ur K ¨ unstliche Intelligenz, DFKI) with sites in Kaiserslautern and Saarbrücken is a non-profit organization which was founded in 1988. The DFKI conducts application-oriented basic research in the field of artificial intelligence and other related subfields of computer science. The overall goal is to construct systems with technical knowledge and common(More)
Deductive object bases attempt to combine the advantages of deductive rela-tional databases with those of object-oriented models. We review modeling and optimization issues encountered during the development of ConceptBase, a prototype deductive object base supporting the Telos data model. We also report on a number of application experiences in the eld of(More)
BACKGROUND This retrospective study aimed to identify prognostic factors in patients with brain metastases from cutaneous melanoma. METHODS In all, 265 patients under regular screening according to valid national surveillance guidelines were included in the study. Kaplan-Meier analyses were performed to estimate and to compare overall survival. Cox(More)
Many, but not all patients with congenital hemiparesis (i.e., hemiparesis due to a pre-, peri- or neonatally acquired brain lesion) control their paretic hands via ipsilateral cortico-spinal projections from the contra-lesional hemisphere (CON-H). Patients who still control their paretic hands via preserved crossed cortico-spinal projections from the(More)
ConceptBase is a deductive object-oriented database system intended for the management of metadata. A distinguishing feature of the Telos language underlying ConceptBase is the ability to manage rules and constraints across multiple levels of instantiation in so-called meta formulas, thus offering uniform consistency management across heterogeneous(More)
BACKGROUND Type I aortic dissection develops in 0.6% of patients late after aortic valve replacement (AVR), and 13% of patients with type I aortic dissections have a history of AVR. Predictors of aortic dissection at AVR, however, have not been characterized. METHODS AND RESULTS A study group of 33 patients with type I aortic dissection had aortic surgery(More)