Medication quality and safety are crucial to the health of the public. Responding to the urgent need for medication information provenance and anti-counterfeiting, this study proposes a blockchain based method for medication information storage, inquiry, and anti-counterfeiting along a medication supply chain. Leveraging the features of decentralization, tamper-proof, traceability, and participative node maintenance of blockchain technology, the proposed method can assure the transparency and openness of medication supply chains. An access control policy model based on smart contract is designed to prevent medication information from being altered or disclosed at nodes of the blockchain. In addition, a pointaccumulation upgrade/downgrade mechanism is introduced to improve the consensus mechanism. The proposed solution eliminates the needs for centralized institutions and third-party organizations, and provides a full record of the medication circulation process. Our simulation results show that efficiency and security are enhanced by the improved consensus algorithm and access control mechanism. As a result, our method can render high level of security and privacy protection that is critical to the integrity of a medication information management system.
V-shape adapter is one of the most used hollow adapter in submarine-lunched missile, studying on influence of mechanical property of adapter on submarine-launched performance has an important significance. Firstly, mechanical analysis on V-shape adapter is done and the equivalent out-of-plane mechanical property of adapter is obtained. Secondly, the equivalent constitutive model is built and the user subroutine VUMAT is developed based on ABAQUS/Explicit, while the stability and reliability of the calculation results are verified. According to the requirements of adapter performance from submarine-lunched missile, optimization design for adapter is carried out. The results show that the equivalent constitutive model can simplify the simulation of adapter and shorten the engineering time in research, and the optimized adapter can have a good effect on vibration reduction and supporting based on some relevant conditions.
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