Hub facilities are centralized locations that consolidate and distribute the commodities in transportation networks. In many real world applications, transport service providers may prefer to lease hub for a time horizon rather than being owned or constructed. this paper, modeling framework is proposed multi-period location problem arises design of star–star network with two types hubs links. I...

0377-2217/$ see front matter 2011 Elsevier B.V. A doi:10.1016/j.ejor.2011.01.014 ⇑ Tel.: +90 312 290 27 68; fax: +90 312 266 40 54. E-mail address: [email protected] In this paper, we study allocation strategies and their effects on total routing costs in hub networks. Given a set of nodes with pairwise traffic demands, the p-hub median problem is the problem of choosing p nodes as hub loca...

The problem of maximal hub covering as a challenging problem in operation research. Transportation programming seeks to find an optimal location of a set of hubs to reach maximum flow in a network. Since the main structure's parameters of the problem such as origin-destination flows, costs and travel time, change periodically in the real world applications, new issues arise in handling it. In t...

The given paper deals with the problem of structural control (dependability planning) for a wide class of any multi-component standby systems consisting of unreliable renewable elements. Mathematical models for interaction of degradation and its compensation processes in the above mentioned systems are constructed and partially investigated. These models represent open and closed queuing system...

-The performance in terms of reliability of multi-server computer networks motivates this paper. The probability limit theorem is derived on the virtual waiting time of job in nodes in a multi-server open queueing network and applied to a reliability model for multi-server computer networks where we relate the time of failure of a multi-server computer network to the system parameters. Key-Word...

As the sizes of realistic hub location problems increase as time goes on (reaching thousands nodes currently) this makes such difficult to solve in a reasonable using conventional computers. This study aims show that may be solved short computing and with high-quality solutions computational power GPU (actually available most personal computers). So, we present GPU-based approach for uncapacita...

This paper offers a description of a new transactional model designed for a m-commerce 4G architecture, and the economic benefit that it can bring to an organization. For the design, it has been used a Hub and Spoke transport model for the material flow, a Queuing model for the bank company transactions flow, and a LDPC/MIMO channel for the transmission environment. With the new system, the SNR...