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《Optimization》2012,61(3):393-408
At first discrete-differential processes are reduced to “shortest-path-problems” in graphs without approximation. For vector minimum problems, especially shortest-path-problems with vector-valued lengths of arcs, the notion of an optimal-efficient solution,. of an optimal-efficient path resp. with regard to a real-valued valuation is introduced. To compute an optimal-efficient path, analog of the algorithms of Bellman, Ford, Floyd and Dantzing for vector-valued lengths of arcs and generalized measures of paths are given.  相似文献   

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Ohne ZusammenfassungDiplomarbeit bei Prof. Dr.E. Specker an der E.T.H. Zürich.  相似文献   

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《Optimization》2012,61(3):427-440
New algorithms for enumerating all circuits of a directed graph are presented. These algorithms are backtrack algorithms, by which we intended to avoid fruitless computations. The best results give algorithms involving heuristic rules.

To receive numerical comparisons additionally the algorithms of DÖRFLER/MÜHL-BACHER, TIERNAN/SYSLO and BJELKINA were programmed and tested in FORTRAN (CDC 3300) and (or) ALGOL (ICL 4130).  相似文献   

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Summary The paper describes a method for numerically solving an elliptic type differential equation connected with a diffusion problem with superimposed convection. The method consists in replacing the differential equation by a set of simultaneous difference equations which are solved exactly, thus avoiding difficulties inherent to the relaxation method. An example is treated in detail and the truncation error is discussed.

Die vorliegende Mitteilung handelt von einem Teil eines Forschungsprojektes Probleme des Gasaustausches in der Lunge der ArbeitsgemeinschaftK. Bucher, Pharmakologische Anstalt, undF. Grün, Physikalisch-Chemische Anstalt. Die Untersuchungen werden in verdankenswerter Weise subventioniert von der F.-Hoffmann-La-Roche-Stiftung zur Förderung wissenschaftlicher Arbeitsgemeinschaften in der Schweiz.  相似文献   

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It is shown that there exists, up to isomorphism, exactly one non-Desarguesian translation plane of order 49 which admits non-trivial shears. Furthermore, the collineation groups of this plane and all its derived planes are described.  相似文献   

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The eigenmodes of a cylindrical homogeneous plasma may be calculated analytically. There are three classes of solutions. The eigenvalues of the first class are well separated, those of the second class have a point of accumulation. The eigenvalue of the third class is infinitely degenerated. The eigenvalues and eigenmodes of the corresponding discrete finite element problem tend towards the true solution. The convergence properties are discussed.  相似文献   

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