Abstract The availability of railway networks is important for society and the economy. To keep infrastructure in good condition, regular maintenance needed. Regular achieved by devising schedules that assign safe work zones to crews executing preventive activities. This study aims optimize both train operators contractors, considering (a) hindrance parked passenger trains planned freight train...

This study focuses on one of the most effective type of capacity markets named Capacity Subscription (CS) market which is predicted to be widely used in the upcoming smart grids. Despite variant researches done about the mechanism and structure of capacity markets, their performances have been rarely tested in the presence of network constraints. Considering this deficiency, we tried to propose...

• Assortative interests and capacity constraints shape stable friendship networks. For intermediate assortativity extremely partially homophilic patterns co- exist. Due to relations also feature heterophily. There is a conflict between welfare maximizing We study networks under the assumption that people are constrained build qualities of their relations. investigate connection (exogenous) asso...

The performance of interconnected networks is highly depenht on the performance of the gateways. Since the finite storage capability of gateways effects the throughput it has to be considered for the analysis of interwnnected networks. Different configurations of networks are studied: i) Gateways and the channels of local area networks have no buffer capacity constraints, ii) Only gateways have...

A low complexity dynamic subcarrier and power allocation methodology for downlink communication in an OFDM-based multiuser environment is developed. The problem of maximizing overall capacity with constraints on total power consumption, bit error rate and data rate proportionality among users requiring different QOS specifications is formulated. Assuming perfect knowledge of the instantaneo...

introduction: the critical dependence of healthcare services systems on information along with the indigenous restriction of paper documents in satisfying this need has caused a trend toward computer information systems. the main goal of such systems is to achieve electronic health records (ehr). however, implementation of ehr in healthcare organizations is difficult and complicated. this resea...