A Quantitative Description of Complex Adaptive System：The Self-Adaptive Mechanism of the Material Purchasing Management System Towards the Changing Environment

This paper demonstrates a new interpretation of the material purchasing management system（MPMS） from the perspective of complex adaptive systems（CAS）.Within the framework of CAS,the authors design the self-adaptive mechanism of the MPMS responding to the changing environment,such as the change of the price,by using risk measurement theory,modern portfolio theory（MPT） and the information of the material＇s modifying priority.As a bottom-up systems view,CAS focuses on the individual level and studies system＇s overall complexity by analyzing the mutual competition and adaptation among the individuals.This paper demonstrates a quantitative description of CAS by discussing the MPMS which can be viewed as a kind of CAS,and makes numerical simulations of Daqing oilfield MPMS.Compared to the benchmarks,the authors set the simulations show that the self-adaptive mechanism adapts well to the change of the material＇s market price.Hence,this paper accomplishes a numerical simulation of CAS＇s quantitative self-adaptive mechanism responding to the environment＇s change.