通过期权机制,分别建立了基于需求预测的两阶段生产和订购模式下的集中决策型和合作型供应链中各决策主体的决策模型,发现期权机制要优于传统的报童模型(N ew svendor)。在合作型供应链中,供应商和零售商根据预测结果合理地安排其两阶...通过期权机制,分别建立了基于需求预测的两阶段生产和订购模式下的集中决策型和合作型供应链中各决策主体的决策模型,发现期权机制要优于传统的报童模型(N ew svendor)。在合作型供应链中,供应商和零售商根据预测结果合理地安排其两阶段的生产和订购量,通过选择不同的期权价格政策,可以将部分市场风险转移给供应商,供应商也因此通过期权而获得相应的风险补偿,从而实现供应链协调。最后根据电子半导体类产品的特征,对论文中的理论模型进行了详细的模拟分析,结果验证了期权契约在需求预测环境下的供应链协调过程中的有效性。展开更多
Ciphertext policy attribute based encryption(CP-ABE)can provide high finegrained access control for cloud storage.However,it needs to solve problems such as property privacy protection,ciphertext search and data updat...Ciphertext policy attribute based encryption(CP-ABE)can provide high finegrained access control for cloud storage.However,it needs to solve problems such as property privacy protection,ciphertext search and data update in the application process.Therefore,based on CP-ABE scheme,this paper proposes a dynamically updatable searchable encryption cloud storage(DUSECS)scheme.Using the characteristics of homomorphic encryption,the encrypted data is compared to achieve efficient hiding policy.Meanwhile,adopting linked list structure,the DUSECS scheme realizes the dynamic data update and integrity detection,and the search encryption against keyword guessing attacks is achieved by combining homomorphic encryption with aggregation algorithm.The analysis of security and performance shows that the scheme is secure and efficient.展开更多
文摘通过期权机制,分别建立了基于需求预测的两阶段生产和订购模式下的集中决策型和合作型供应链中各决策主体的决策模型,发现期权机制要优于传统的报童模型(N ew svendor)。在合作型供应链中,供应商和零售商根据预测结果合理地安排其两阶段的生产和订购量,通过选择不同的期权价格政策,可以将部分市场风险转移给供应商,供应商也因此通过期权而获得相应的风险补偿,从而实现供应链协调。最后根据电子半导体类产品的特征,对论文中的理论模型进行了详细的模拟分析,结果验证了期权契约在需求预测环境下的供应链协调过程中的有效性。
基金supported by the National Nature Science Foundation of China under grant No.(61562059,61461027,61462060)。
文摘Ciphertext policy attribute based encryption(CP-ABE)can provide high finegrained access control for cloud storage.However,it needs to solve problems such as property privacy protection,ciphertext search and data update in the application process.Therefore,based on CP-ABE scheme,this paper proposes a dynamically updatable searchable encryption cloud storage(DUSECS)scheme.Using the characteristics of homomorphic encryption,the encrypted data is compared to achieve efficient hiding policy.Meanwhile,adopting linked list structure,the DUSECS scheme realizes the dynamic data update and integrity detection,and the search encryption against keyword guessing attacks is achieved by combining homomorphic encryption with aggregation algorithm.The analysis of security and performance shows that the scheme is secure and efficient.
