On the general minimax theorem
On the generalization of the STER distribution applied to generalized hypergeometric parents
On the generalized strongly nonlinear implicit variational inequalities in reflexive Banach spaces
On the hardness of approximating the UET-UCT scheduling problem with hierarchical communications
We consider the unit execution time unit communication time (UET-UCT) scheduling model with hierarchical communications [1], and we study the impact of the hierarchical communications hypothesis on the hardness of approximation. We prove that there is no polynomial time approximation algorithm with performance guarantee smaller than (unless ). This result is an extension of the result of Hoogeveen et al. [6] who proved that there is no polynomial time -approximation algorithm with for the...
On the hardness of approximating the UET-UCT scheduling problem with hierarchical communications
We consider the unit execution time unit communication time (UET-UCT) scheduling model with hierarchical communica tions [CITE], and we study the impact of the hierarchical communications hypothesis on the hardness of approximation. We prove that there is no polynomial time approximation algorithm with performance guarantee smaller than 5/4 (unless P = NP). This result is an extension of the result of Hoogeveen et al. [CITE] who proved that there is no polynomial time ρ-approximation algorithm...
On the hierarchy of functioning rules in distributed computing
On the hierarchy of functioning rules in distributed computing
In previous papers, we used a Markovian model to determine the optimal functioning rules of a distributed system in various settings. Searching optimal functioning rules amounts to solve an optimization problem under constraints. The hierarchy of solutions arising from the above problem is called the “first order hierarchy”, and may possibly yield equivalent solutions. The present paper emphasizes a specific technique for deciding between two equivalent solutions, which establishes the “second...
On the Implementation of Stochastic Quasigradient Methods to some Facility Location Problems
On the implicit programming approach in a class of mathematical programs with equilibrium constraints
On the isoperimetric-type problems with current hyperplanes.
On the iterative construction of a solution of nonlinear elliptic boundary value problems
On the iterative process
On the level crossing of multi-dimensional delayed renewal processes.
On the mathematical aspects of an urban retail model
On the maximum probability criteria concerning the sequencial decision-making problem.
On the M/G/1 retrial queue subjected to breakdowns
Retrial queueing systems are characterized by the requirement that customers finding the service area busy must join the retrial group and reapply for service at random intervals. This paper deals with the M/G/1 retrial queue subjected to breakdowns. We use its stochastic decomposition property to approximate the model performance in the case of general retrial times.
On the M/G/1 retrial queue subjected to breakdowns
Retrial queueing systems are characterized by the requirement that customers finding the service area busy must join the retrial group and reapply for service at random intervals. This paper deals with the M/G/1 retrial queue subjected to breakdowns. We use its stochastic decomposition property to approximate the model performance in the case of general retrial times.
On the minimum cost multiple-source unsplittable flow problem
The minimum cost multiple-source unsplittable flow problem is studied in this paper. A simple necessary condition to get a solution is proposed. It deals with capacities and demands and can be seen as a generalization of the well-known semi-metric condition for continuous multicommdity flows. A cutting plane algorithm is derived using a superadditive approach. The inequalities considered here are valid for single knapsack constraints. They are based on nondecreasing superadditive functions and...
On the minimum dummy-arc problem
On the minimum time problem in linear discrete systems with the discrete set of admissible controls