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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Computing 55 (1995), S. 23-42 
    ISSN: 1436-5057
    Keywords: Radiosity ; Monte Carlo ; algorithms ; stochastic convergence ; transillumination method ; stochastic shooting method ; variance reduction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Die vorgestellten neuen Radiosity Methoden für diffuse Szenen sind besonders geeignet, um die Lichtausbreitung in sehr komplexen Umgebungen in linearer Zeit zu berechnen. Die Verfahren beruhen auf rekursiven Algorithmen, die das Radiosity-Gleichungssystem mittels stochastischer Konvergenz löseu. Approximationen der ‘gathering-’ und ‘shooting-’ Verfahren werden statt einer exakten Berechnung jedes Reflexionsschrittes verwendet. Die Effizienz der Verfahren kann durch geeignete Varianzreduktionsmethoden verbessert werden.
    Notes: Abstract The fast radiosity-type methods for very complex diffuse environments, introduced herein, present a nearly linear-time solution. The outlined procedures rely on recursive algorithms with stochastic convergence for solving the radiosity equation system. Approximations of gathering and shooting at very low computational cost—rather than the exact matrix of a single reflection—are used. The efficiency of the methods will be increased by applying variance reduction techniques.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1434-9949
    Keywords: Palindromic Rheumatism ; Episodic Arthritis ; Rheumatoid Arthritis ; Negev ; Israel
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Over a period of 10 years 34 patients were diagnosed as suffering from palindromic rheumatism. Eightyone percent of the patients were of North African origin. This is significantly higher (p=0.01) than the ageadjusted origin of the general population in the region. Attacks were usually monoarthritic or oligoarthritic in nature. The joint most often involved was the knee. Prophylactic therapy with colchicine was ineffective. Gold salts brought about partial remission in three of six patients. Despite a relatively long average follow-up period of 9.3 years and the finding of a positive rheumatoid factor in 12% of the patients, not one of the patients developed rheumatoid arthritis. In 50% of the patients we detected an unexplained elevation in serum globulins and immunoglobulins. The possible association between this syndrome and Familial Mediterranean Fever is discussed.
    Type of Medium: Electronic Resource
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