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  • 1990-1994  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Some properties of graph centroids (1991)
    Springer
    Annals of operations research 33 (1991), S. 227-236 
    Details
    ISSN: 1572-9338
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Notes: Abstract The concept of a branch weight centroid has been extended in [12] so that it can be defined for an arbitrary finite setX with a distinguished familyC of "convex" subsets ofX. In particular, the centroid of a graphG was defined forX to be the vertex setV(G) ofG andU ⊂V(G) is convex if it is the vertex set of a chordless path inG. In this paper, which is an extended version of [13], we give necessary and sufficient conditions for a graph to be a centroid of another graph as well as of itself. Then, we apply these results to some particular classes of graphs: chordal, Halin, series-parallel and outerplanar.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02115757
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Quality of life in patients with intracranial tumors on the basis of Karnofsky's performance status (1992)
    Springer
    Journal of neuro-oncology 13 (1992), S. 177-181 
    Details
    ISSN: 1573-7373
    Keywords: intracranial tumors ; quality of life ; Karnofsky rating
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary This prospective clinical trial (1983–1989) compares life-quality scores according to Karnofsky in patients with intra-cranial who had been operated upon. Karnofsky's performance status was evaluated during a follow-up period of 36 months. The patients were between 20 to 77 years of age; 132 patients had an astrocytoma grade III or IV; 42 patients with brain metastases were investigated; 72 had an astrocytoma grade I + II, and 144 had a meningioma. The median survival in patients with astrocytomas grade III or IV was 12 months; a short period with nearly normal activity (Karnofsky score 75) was followed by rapid deterioration. In patients with brain metastases, postoperatively the median functional ability reached its highest value three weeks after treatment and then decreased continuously (average score from 50–25). In patients with astrocytomas grade I and II, life-quality was reasonably good (mean score up to 75). The score was observed to increase slightly during the first year after treatment. A performance status improvement up to 80 could be obtained in patients with meningiomas; however, 35% were left unfit for work.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00172768
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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