Osadchy Y. Processing optimization of letter-post in postal service entities of multilevel hierarchical Network

Work objective is efficiency increasing of Ukrainian State Enterprise "Ukrposhta" due to letter-post processing optimization in postal service entities. Research object is technological process and it's divisional of letter-post processing. Researching methods based on mathematical analysis, mathematical simulation methods, operations researching methods adopted to the optimization of postal network and system problems. Novelty, theoretical and practical results are: for first time ever default conditions of out-of-service time processes of postal items sorting and wrapping are defined, which constitute mathematical description of signed processes and provide a way to quantify average time value, which is taken on sorting and wrapping out-of-service times; for first time ever efficiency investigations of postal items sorting and wrapping were carried out, it follows that average real productivity value of automatic letter-sorting machine is 75% from technical in consequence of unintended sorting out-of-service times during sorting processes organization with regular wrappings; for first time ever real values distribution of letter-post sorting productivity according to the sorting box pigeonholes was calculated experimentally; fixing algorithm of sorting box pigeonholes by postal flows and time evaluating and sorting productivity, which provides a way to increase operations productivity of letter-post sorting, was developed; simulation algorithms of sorting and consecutive or parallel wrapping of postal items were developed; algorithm of high-speed time indexes simulation for sorting and wrapping processes of postal items was developed according to the minimum charges criterion; optimization technique for stackers' quantity and capacity of automatic letter-sorting machine was developed according to the minimum charges criterion. Researching results were realized in production processes of Ukrainian State Enterprise "Ukrposhta" and in teaching situation of Odessa National Academy of Telecommunication named after O.S.Popov