Showing papers on "Service system published in 1975"

Approximating the Performance of Urban Emergency Service Systems

Abstract: This paper presents an approximate procedure for computing selected performance characteristics of an urban emergency service system. Based on a recently developed hypercube queuing model, the procedure requires for N servers solution of only N simultaneous equations, rather than 2N as in the exact model. The procedure relies on the theory of M/M/N queues in which servers are selected randomly and without replacement until the first available free server is found. The underlying model is intended for analyzing problems of vehicle location and response district design in urban emergency services, includes interdistrict as well as intradistrict responses, and allows computation of several point-specific as well as area-specific performance measures.

Waiting Time Distribution in a Poisson Queue with a General Bulk Service Rule

Abstract: This paper relates to a queueing system with Poisson input and exponential service time, service taking place in batches under a “general bulk service rule.” A batch will contain no fewer than “a” and no more than “b” units. The object of this paper is to study the waiting time distribution of such a bulk service system under steady state and also to indicate how the moments of the distribution can be obtained.

Management Science's Impact on Service Strategy

Abstract: The practice of management science has made a significant impact on the performance of the Xerox service organization. The National Service department has implemented a new service strategy for the 9,200 duplicator which provides better service to the customers at less cost to Xerox. The basic management science concept behind this service strategy is the utilization of queuing theory to reduce the service force idle time and simultaneously reduce the response time to a customer initiated call for service. The results of the queuing analysis indicated that a major productivity improvement could be achieved with mini-teams. It was decided that a three man mini-team was the best compromise (in terms of manageability) between a one-man territory and team territories which had four or more service men. Implementation of this service strategy has yielded the following results: (1) Specification to Xerox customers of response times for customers initiated service calls, and (2) An average increase in productivi...

Service module for hostile environment

Abstract: A service module adapted for service work while protecting workers in hostile environments utilizes an insulated capsule to be lowered over the service area, which capsule contains a work area inside for workmen to perform the required service operations. Power and materials are supplied to the inside of the capsule by an umbilical connected to external sources and the capsule has an entranceway connectable to external transportation means to fully protect the workers when transferring into and out of the capsule.

A Social Service Measurement Model

Abstract: The development and implementation of a service value measurement model for a system of social service agencies is discussed. The system, the Jewish Community Federation of Cleveland, is a voluntary association of sixteen human service agencies. Design and workings of the project team, analysis and structuring of the organizational system, and overall goals of the research are first presented. The measurement model itself is then delineated. Essentially, the model is a device for assembling and synthesizing information on system throughput, priorities, and indicators of “quality” of service. Finally, the information system that supports the model is examined and other issues relating to implementation are discussed.

Relevant Policies for Markovian Queueing Systems with Many Types of Service

Abstract: A single station service system with bounded queue capacity operates in discrete time, and at each period, one out of K possible service rates is used. A subclass of the stationary nonrandomized policies—termed relevant—which uses only a subset of the available service rates, is proved optimal for the average cost criterion. If there is some type of service whereby the expected cost per served customer is no more than the expense of losing him, the service rate in all relevant policies increases with the number of customers observed in the system; if there is no such type of service, the service rate in all relevant policies decreases with the number of observed customers.