Abstract It would be a good thing to have at our disposal general theory of location that is neutral with respect (i.e. does not rule out or entail) (i) the view some objects more than one exact location, (ii) are located without having an and (iii) “spanners”—where spanner object exactly region has proper parts but which no part region. As far as I know, can found in literature this feature. p...

Rough Sets theory is a mathematical approach for analysis of a vague description of objects presented by a well-known mathematician, Pawlak (1982, 1991). This paper explores the use of Rough Sets theory in site location investigation of buried concrete water reservoirs. Making an appropriate decision in site location can always avoid unnecessary expensive costs which is very important in constr...

There exist various service systems that have hierarchical structure. In hierarchical service networks, facilities at different levels provide different types of services. For example, in health care systems, general centers provide low-level services such as primary health care services, while the specialized hospitals provide high-level services. Because of demand congestion in service networ...