Based upon the work of simplification of the recovery system model under the condition of product recall,the multi-level inventory optimization model of reverse logistics are presented and the repair cost are considered.

A new idea about local recovery of route that limited the repair near the broken links was proposed to decrease the reaction time of route breakage and the overhead of route maintenance.

According to the DSR protocol maintenance\'s weakness,a new idea about local recovery of route was proposed which made full use of neighbor nodes cache,limited the scope of repair in one or two hops,reduced repair time,decreased the routing maintenance expense and increased the capability to handle the link failure.

AODV protocol of improving local repair mechanism in MANET

Combination forecasting model of aero-engine maintenance costs based on statistic rough sets theory;

Research on the Key Points of Life-cycle Control and Analysis of Civil Aircraft Maintenance Costs;

Analysis of warranty cost for computer hardware based on Bayesian networks;

This paper summarizes types of warranties, then establishes a warranty cost model, finally studies the optimal warranty length in warranty policies.

In thisdissertation, we investigate in depth the process of warranty from manufacturers point of view and establish math model of the warranty cost so that we can get theoptimal warranty length and the minimal warranty cost.