In this paper,through analyzing the transmission schemes,the delay performances of both above protocols are studied based on Equivalent Service Time,which takes into account the packet length(m unit-times),the propagation delay and the procession delay and the receiver feedback delay.

This paper expounds the significance of promoting the equal service in the library, analyzes the advantages of the library in promoting the equal service, and probes into how university library to promote the equal service effectively.

Based on setting up the classification of the network usable resources and its locking time, a kind of simple distributed dynamic optical link establishment method with CoS (class of service) in automatic switching optical network was proposed.

Parallel scheduling on three machines under a grade of service provision;

For m parallel machines scheduling with two grade of service (GoS) levels,it is shown that the worst-case ratio of the modified MF algorithm is at most 4/3+(1/2)~k,where k is the desired number of iteration,which improves greatly the known result 2-1/(m-1).

In this paper,the authors study the parallel machine scheduling problem with a grade of service(GOS) and the scheduling problem of emergency management service.