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Lev Kazakovtsev

Publications and source records attributed to Lev Kazakovtsev.

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Access Points Placement as a Discrete Optimization Problem

In this work, we consider a method of searching of the direction of a wireless network development (the places of new access points or base stations etc.) optimized with criteria of coverage of important territories and minimum cost of equipment and additional needed infrastructure which does not need the execution of special field testings and determination of the exact geometry of elements of RF-propagation medium and their RF absorbing properties but takes into account the minimum accessible information obtained from built-in measuring instruments of wireless hardware and approximate data of the medium elements shape. The problem of search of a disposition and types of the infrastructure elements of the growing network is formulated as a multicriteria discrete constrained optimization problem solvable with variant probability method [1]. The problem of a medium RF-propagation properties modeling is also formulated and solved as a discrete optimization task.

cs.NI

Parallel Random Search Algorithm of Constrained Pseudo-Boolean Optimization for Some Distinctive Large-Scale Problems

In this paper, we consider an approach to the parallelizing of the algorithms realizing the modified probability changigng method with adaptation and partial rollback procedure for constrained pseudo-Boolean optimization problems. Existing optimization algorithms are adapted for the shared memory and clusters (PVM library). The parallel efficiency is estimated for the lagre-scale non-linear pseudo-Boolean optimization problems with linear constraints. Initially designed for unconstrained optimization, the probability changing method (MIVER) allows us finding the approximate solution of different linear and non-linear pseudo-Boolean optimization problems with constraints. Although, in case of large-scale problems, the computational demands are also very high and the precision of the result depends on the time spent. In case of the constrained optimization problem, even the search of any permissibly solution can take very large computational resources. The rapid development of the parallel processor systems which are often implemented even in the computer systems designed for home use allows to reduce significantly the time spent to find the acceptable solution with a speed-up close to ideal.

cs.DC