The object of this paper is to study joint and marginal distributions of the system states at any arbitrary time moment for a single server, finite source retrial queue, in which the server can sustain breakdowns during service times. The server life times as well as the intervals between repetitions are exponentially distributed, while the repair and the service times are generally distributed...

Chakka, R. and I. Mitrani, Heterogeneous multiprocessor systems with breakdowns: performance and optimal repair strategies, Theoretical Computer Science 125 (1994) 91-109. A model of a system with N parallel processors subject to occasional interruptions of service, and a common unbounded queue fed by a Poisson arrival stream, is analyzed in the steady state. The service, breakdown and repair c...

The ETICA project aims to identify emerging information and communication technologies. These technologies are then analysed and evaluated from an ethical perspective. The aim of this analysis is to suggest possible governance arrangements that will allow paying proactive attention to such ethical issues. During the ETICA workshop at the summer school, participants were asked to choose one of t...

This paper presents a unique flywheel-based regenerative energy recovery, storage and release system developed at the author’s laboratory. It can recover and store regenerative energy produced by braking a motion generator with intermittent rotary velocity such as the rotor of a wind turbogenerator subject to intermittent intake wind and the axels of electric and hybrid gas-electric vehicles du...

In this paper, we investigate a single-server Poisson input queueing model, wherein arrivals of units are in bulk. The arrival rate of the units is state dependent, and service time is arbitrary distributed. It is also assumed that the system is subject to breakdown, and the failed server immediately joins the repair facility which takes constant duration to repair the server. By using suppl...

The web-based service (WBS) composition, e.g. mashup, is becoming a popular style to assemble web services. Numerous web-based services are developed by independent organizations and individuals due to the open nature of Web and SOA. As a result, when these components are assembled, the undesired interactions will take place and bring negative impacts. From the perspective of the feature intera...

BACKGROUND People with intellectual disabilities (IDs) whose behaviour challenges services are at increased risk of placement breakdown. Most previous research has tended to focus on the role of individual characteristics in predicting breakdown. A small number of studies have suggested that service variables may impact on intervention effectiveness and hence placement breakdown. METHOD This ...

This paper proposes the procedure to find out the total average cost in terms of crisp values for /M/1/BD/MV with fuzzy parameters. In which arrival rate, service rate, batch size, setup, vacation, breakdown, repair rates, and the start up ,build up, holding, setup, dormant, breakdown costs and cost for busy and vacation periods are all considered as trapezoidal fuzzy numbers. As ranking techni...

In this chapter we provide an overview of the application of the results obtained in Sensoria (i.e., techniques, methods and languages developed in the technical work packages WP1-WP7) to case studies from the Automotive, eUniversity, Finance and Telecommunication domains (developed in work package WP8).

In this paper, we investigate the variation in the reusable rate of cores (used products) on the performance of the remanufacturing system. The remanufacturing system considered here consists of three modules; viz., the disassembly and testing module for returned products, the disposition module for non-reusable returns, and the remanufacturing module. Each server in the system is subject to br...