Identification Of PPP Project Renegotiation Trigger Events Based On CBR

PPP project itself has the characteristics of complex transaction structure,numerous project stakeholders and long project cycle.And the initial contract has a high degree of incompleteness.Therefore,these make it difficult for the transaction party to predict all potential renegotiation trigger events when signing the initial contract,making it extremely easy for complex renegotiation to occur in the actual implementation of PPP projects.,which will lead to increased transaction costs,reduced execution efficiency,project breakdown and other negative effects.In this regard,this paper will build a CBR based event recognition model to avoid unnecessary renegotiation of new PPP projects.Firstly,this article through the analysis of the PPP project negotiation literature and case design and implementation of the present situation of the renegotiation trigger questionnaire.At the same time,SPSS is used to test the survey results and analyze the data,so as to put forward the existing problems in the identification of trigger events in the renegotiation of PPP projects at the present stage.That is to say,the case experience and knowledge mining is not enough,and the research depth of potential renegotiation trigger event of new PPP project is insufficient.Secondly,based on the existing problems in the PPP project to negotiate an event,the CBR operation mechanism of PPP project renegotiation trigger event recognition is designed,and the required database and reasoning model are constructed for the operation of the mechanism.To be more specific,the rough set principle is used to reduce the feature attribute set of the case based on constructing case base and the case feature attribute set selected.At the same time,the similarity algorithm based on distance is used to calculate the similarity between the target case and the source case,and finally the retrieval of similar cases is completed.If it is difficult to output the ideal scheme by using the CBR system.If the maximum similarity of the case retrieval is lower than the threshold value of the case output,the case strategy should be modified by the difference driven method.Finally,the PPP projects that have been renegotiated are selected as objects for model deduction,and the deduction results are compared with the actual state of the project to verify the effectiveness and applicability of the model.This paper aims to combine CBR with contract state theory to predict the possible realistic state of the initial contract of a new PPP project,so as to identify the potential renegotiation trigger events of a new PPP project,reduce the incompleteness of the initial contract,and finally avoid unnecessary renegotiation.