In the facility location problem usually reducing total transferring cost and time are common objectives. Designing of a network with hub facilities can improve network efficiency. In this study a new model is presented for P-hub covering location problem. In the p-hub covering problem it is attempted to locate hubs and allocate customers to established hubs while allocated nodes to hubs are in...

At this moment, mobile communications operators are starting to develope third generation network with UMTS technology. In many cases, this technology will be placed in facilities already used by other systems, specially GSM network, so, problems such electromagnetic compatibility and exposure limits regulations values should be carefully studied before introducing the new system in old locations.

Peer-to-peer network in general and specifically the Gnutella network suffer from poor search facilities due to their distributed and decentralized nature. Several improvements to the current implementations have been proposed, but the development of new improvements is hampered by the lack of a simple Gnutella simulator to test out algorithms on. The simulator that we developed is easy to use ...

The success of a reverse supply chain heavily relies on the efficiency of the collection facilities and recovery facilities chosen while designing that reverse supply chain. In this chapter, we propose a neural network approach to evaluate the efficiency of a facility (collection or recovery) of interest, which is being considered for inclusion in a reverse supply chain, using the available lin...

I'm working in a large health care institution that operates a hospital, a day surgery center, nursing homes, urgent care and occupational medicine facilities, and medical office buildings on four campuses, two community health clinics, as well as eight home health agencies in surrounding counties. We have installed a firewall to segregate the main campus network, a Frame Relay network connecti...

This paper presents a novel “virtual fiber” network service that exploits wavebands. This service provides virtual direct tunnels that directly convey wavelength paths to connect customer facilities. To improve the resource utilization efficiency of the service, a network design algorithm is developed that can allow intermediate path grooming at limited nodes and can determine the best node loc...

This paper aims to propose a reliable location-allocation model where facilities are subject to the risk of disruptions. Since service facilities are expected to satisfy random and heavy demands, we model the congested situations in the system within a queuing framework which handles two sources of uncertainty associated with demand and service. To insure the service quality, a minimum limit re...

Globally, new cancer cases will rise by 57% within the next two decades, with the majority in the low- and middle-income countries (LMICs). Consequently, a steep increase of about 40% in cancer deaths is expected there, mainly because of lack of treatment facilities, especially radiotherapy. Radiotherapy is required for more than 50% of patients, but the capital cost for equipment often deters ...

This paper concerns performance modeling of semiconductor manufacturing operations. More specifically, it focuses on queueing network models for an analysis of wafer fabrication facilities. The congestion problems that plague wafer fabrication facilities are described in general terms, and several years' operating data from one particular facility are summarized. A simple queueing network model...