Abstract Present paper describes with the bulk arrival retrial queueing M / G1, G2, / 1 model with two phase service and Bernoulli vacation schedule wherein first phase service is essential and the next second phase service is optional. If the second phase service is not demanded by arriving customer then the single server takes a vacation period according to Bernoulli vacation schedule in orde...

We study an M/G/1 queueing system where the arrival follows Poisson Process. The server provides service in two stages, the first stage service is essential and the second stage of service is optional. If the system is empty then the server goes for a vacation of random duration and after returning from vacation the server decides to take a second vacation which is optional. When the server is ...

In this paper, we study a single server Markovian queue with state dependent accessible services, reneging and feedback of customers. The server can accommodate at the most $d$ customers in the service station, after which the new arrivals have to wait in the primary queue of infinite waiting space. All arrivals demand First Essential Service (FES), after completing FES, customers decide to joi...

In this paper, we consider a specific variant of the field service routing problem. It consists in determining vehicle routes in a single period to serve two types of customers: mandatory and optional. Mandatory customers have to be served within a specified time window whereas optional customers may be served (or not) within the planning horizon. For more realism, we assume that service as wel...

Architecture Concrete realization: CORBA Elements Concrete realization: Java Elements Message Transport Agent Directory ACL Service Directory Message Transport Agent Directory ACL Service Directory 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 Figure 1: Abstract Architecture Mapped to Various Concrete Realizations The abstract architecture also describes optional eleme...

as one of the motivational theories which define both values and attitudes beyond personal as well as organizational benefits, public service motivation (psm) model aims to underscore the appreciation of individuals with regard to public interests. if psm pattern being optional is synchronized with civic-organizational behavior, its effectiveness is manifested in improving service quality. the ...