This paper analyzed the multi-machine repairable system with one unreliable server and repairman. The machines may break at any time. One oversees servicing machine breakdown. fail time different failure rates in idle busy repairman is responsible for repairing failure; repair rate variable to adapt whether are all functioning normally or not. All distributions exponential. Using quasi-birth-de...

This investigation deals with MX/G/1 queueing model with setup, bulk- arrival, loss-delay and balking. The provision of second optional service apart from essential service by an unreliable server is taken into consideration. We assume that the delay customers join the queue when server is busy whereas loss customers depart from the system. After receiving the essential service, the customers m...

In this paper we consider M[X]/G(a, b)/1 queueing system with accessible service, server breakdown without interruption, multiple vacation and closedown time. The service rule is as follows: the server starts service only when a minimum number of customers ′a′ is available in the queue and the maximum service capacity is ′b′ units such that late entries are allowed to join a service batch, with...

In most queueing systems the server may be subjected to lengthy and unpredictable breakdowns while serving a customer. For instance, in manufacturing systems the machine may breakdown due to malfunction or job related problems; in computer systems, the machine may be subject to scheduled backups and predicted failures. In these systems, server breakdown results in a period of server unavailabil...

This paper presents the development of an Internet server controller based intelligent maintenance system for products. It also discusses on how to develop products and manufacturing systems using Internet-based intelligent technologies and how to ensure the product quality, coordinate the activities, reduce costs and change maintenance practice from breakdown reaction to breakdown prevention. ...

This paper presents a model for a discrete time single server G-queue with two types of independent arrivals, namely positive and negative. The arrival of negative customer to queueing system removes one customer from the head of the queue (RCH), which causes server breakdown. The repair of the server is noninstantaneous and after repair server is assumed as good as new. The interarrival times ...

Microsoft SQL Server is a multi-component database management system taking advantage of many features of the underlying operating system. Obtaining a breakdown of its workload by categories such as users and applications requires a non-standard approach. This paper describes such an approach as well as architectural features of MS SQL Server relevant for workload analysis and capacity planning.