The Problem of Finding the Maximal Multiple Flow in the Divisible Network and its Special Cases
In the article the problem of finding the maximal multiple flow in the network of any natural multiplicity k is studied. There are arcs of three types: ordinary arcs, multiple arcs and multi-arcs. Each multiple and multi-arc is a union of k linked arcs, which are adjusted with each other. The network ...
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Yaroslavl State University
2015-08-01
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| Series: | Моделирование и анализ информационных систем |
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| Online Access: | https://www.mais-journal.ru/jour/article/view/271 |
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| author | A. V. Smirnov |
| author_facet | A. V. Smirnov |
| author_sort | A. V. Smirnov |
| collection | DOAJ |
| description | In the article the problem of finding the maximal multiple flow in the network of any natural multiplicity k is studied. There are arcs of three types: ordinary arcs, multiple arcs and multi-arcs. Each multiple and multi-arc is a union of k linked arcs, which are adjusted with each other. The network constructing rules are described. The definitions of a divisible network and some associated subjects are stated. The important property of the divisible network is that every divisible network can be partitioned into k parts, which are adjusted on the linked arcs of each multiple and multi-arc. Each part is the ordinary transportation network. The main results of the article are the following subclasses of the problem of finding the maximal multiple flow in the divisible network. 1. The divisible networks with the multi-arc constraints. Assume that only one vertex is the ending vertex for a multi-arc in k −1 network parts. In this case the problem can be solved in a polynomial time. 2. The divisible networks with the weak multi-arc constraints. Assume that only one vertex is the ending vertex for a multi-arc in s network parts (1 ≤ s < k − 1) and other parts have at least two such vertices. In that case the multiplicity of the multiple flow problem can be decreased to k − s. 3. The divisible network of the parallel structure. Assume that the divisible network component, which consists of all multiple arcs, can be partitioned into subcomponents, each of them containing exactly one vertex-beginning of a multi-arc. Suppose that intersection of each pair of subcomponents is the only vertex-network source x0. If k = 2, the maximal flow problem can be solved in a polynomial time. If k ≥ 3, the problem is NP-complete. The algorithms for each polynomial subclass are suggested. Also, the multiplicity decreasing algorithm for the divisible network with weak multi-arc constraints is formulated. |
| format | Article |
| id | doaj-art-1d661ccff64248a3af67d0c922df09d2 |
| institution | DOAJ |
| issn | 1818-1015 2313-5417 |
| language | English |
| publishDate | 2015-08-01 |
| publisher | Yaroslavl State University |
| record_format | Article |
| series | Моделирование и анализ информационных систем |
| spelling | doaj-art-1d661ccff64248a3af67d0c922df09d22025-08-20T03:01:13ZengYaroslavl State UniversityМоделирование и анализ информационных систем1818-10152313-54172015-08-0122453354510.18255/1818-1015-2015-4-533-545257The Problem of Finding the Maximal Multiple Flow in the Divisible Network and its Special CasesA. V. Smirnov0P.G. Demidov Yaroslavl State UniversityIn the article the problem of finding the maximal multiple flow in the network of any natural multiplicity k is studied. There are arcs of three types: ordinary arcs, multiple arcs and multi-arcs. Each multiple and multi-arc is a union of k linked arcs, which are adjusted with each other. The network constructing rules are described. The definitions of a divisible network and some associated subjects are stated. The important property of the divisible network is that every divisible network can be partitioned into k parts, which are adjusted on the linked arcs of each multiple and multi-arc. Each part is the ordinary transportation network. The main results of the article are the following subclasses of the problem of finding the maximal multiple flow in the divisible network. 1. The divisible networks with the multi-arc constraints. Assume that only one vertex is the ending vertex for a multi-arc in k −1 network parts. In this case the problem can be solved in a polynomial time. 2. The divisible networks with the weak multi-arc constraints. Assume that only one vertex is the ending vertex for a multi-arc in s network parts (1 ≤ s < k − 1) and other parts have at least two such vertices. In that case the multiplicity of the multiple flow problem can be decreased to k − s. 3. The divisible network of the parallel structure. Assume that the divisible network component, which consists of all multiple arcs, can be partitioned into subcomponents, each of them containing exactly one vertex-beginning of a multi-arc. Suppose that intersection of each pair of subcomponents is the only vertex-network source x0. If k = 2, the maximal flow problem can be solved in a polynomial time. If k ≥ 3, the problem is NP-complete. The algorithms for each polynomial subclass are suggested. Also, the multiplicity decreasing algorithm for the divisible network with weak multi-arc constraints is formulated.https://www.mais-journal.ru/jour/article/view/271multiple networksmultiple flowsdivisible networksnp-completenesspolynomial algorithm |
| spellingShingle | A. V. Smirnov The Problem of Finding the Maximal Multiple Flow in the Divisible Network and its Special Cases Моделирование и анализ информационных систем multiple networks multiple flows divisible networks np-completeness polynomial algorithm |
| title | The Problem of Finding the Maximal Multiple Flow in the Divisible Network and its Special Cases |
| title_full | The Problem of Finding the Maximal Multiple Flow in the Divisible Network and its Special Cases |
| title_fullStr | The Problem of Finding the Maximal Multiple Flow in the Divisible Network and its Special Cases |
| title_full_unstemmed | The Problem of Finding the Maximal Multiple Flow in the Divisible Network and its Special Cases |
| title_short | The Problem of Finding the Maximal Multiple Flow in the Divisible Network and its Special Cases |
| title_sort | problem of finding the maximal multiple flow in the divisible network and its special cases |
| topic | multiple networks multiple flows divisible networks np-completeness polynomial algorithm |
| url | https://www.mais-journal.ru/jour/article/view/271 |
| work_keys_str_mv | AT avsmirnov theproblemoffindingthemaximalmultipleflowinthedivisiblenetworkanditsspecialcases AT avsmirnov problemoffindingthemaximalmultipleflowinthedivisiblenetworkanditsspecialcases |