Retrial queues have been widely used to model many problems arising in telephone switching systems, telecommunication networks, computer networks and computer systems, etc. It is of basic importance to study reliability of retrial queues with server breakdowns and repairs because of limited ability of repairs and heavy influence of the breakdowns on the performance measure of the system. Howeve...

this paper studies an m/g/1 repairable queueing system with multiple vacations and n-policy, in which the service station is subject to occasional random breakdowns. when the service station breaks down, it is repaired by a repair facility. moreover, the repair facility may fail during the repair period of the service station. the failed repair facility resumes repair after completion of its re...

This paper studies the single server repairable queueing system with variable service rate and failure rate. The rule of variation is that changes when number customers in reaches a certain value. may fail at any time, rates idle periods busy are different. has one reliable repairman to repair server. steady-state joint distribution states obtained by matrix geometric solution method, availabil...

We show for the M/G/1 processor sharing queue that the service time distribution is regularly varying of index −ν, ν non-integer, iff the sojourn time distribution is regularly varying of index −ν. This result is derived from a new expression for the Laplace–Stieltjes transform of the sojourn time distribution. That expression also leads to other new properties for the sojourn time distribution...

In the study of large scale stochastic networks with resource management, differential equations and mean-field limits are two key techniques. Recent research shows that the expected fraction vector (that is, the tail probability vector) plays a key role in setting up mean-field differential equations. To further apply the technique of tail probability vector to deal with resource management of...

Human salivary glands secrete two types of mucins: oligomeric mucin (MG1) with molecular mass above 1 MDa and monomeric mucin (MG2) with molecular mass of 200-250 kDa. Monomers of MG1 and MG2 contain heavily O-glycosylated tandem repeats located at the central domain of the molecules. MG1 monomers are linked by disulfide bonds located at sparsely glycosylated N- and C-end. MG1 are synthesized b...

Salivary mucins MG1 and MG2 have been found in the oral cavity where they perform several functions such as the formation of the mucous layer covering the oral mucosa and teeth. Recent studies have demonstrated their presence in other organs and tissues. The aim of this study was to determine their expression in human bulbourethral (Cowper's) glands. Normal bulbourethral glands were obtained at...

The atomic structure of ordered domains in Ba~Mg1/3Nb2/3)O3 and La-doped and undoped Pb~Mg1/3Nb2/3)O3 is studied by high-resolution Z-contrast imaging. The ordered domain structure in both doped and undoped Pb~Mg1/3Nb2/3)O3 is determined to be in agreement with the charge balanced random-layer model and inconsistent with the space-charge model. It is shown that La doping in Pb~Mg1/3Nb2/3)O3 enh...

In radioimmunotherapy (RIT), hematologic toxicity is the dose-limiting toxicity due to the long circulatory half-life of the antibody. Although intraperitoneal (i.p.) RIT results in high uptake of i.p. growing tumors, the radiolabeled antibody enters the circulation, resulting in bone marrow toxicity. Carbohydrate modification of antibodies could induce accelerated clearance of the antibody via...