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- 저자 : Yinjuan Zhang (검색결과 2 건)
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A Secure Subscription-Push Service Scheme Based on Blockchain and Edge Computing for IoT
Yinjuan Deng,Shangping Wang,Qian Zhang,Duo Zhang 한국인터넷정보학회 2022 KSII Transactions on Internet and Information Syst Vol.16 No.2
As everything linking to the internet, people can subscribe to various services from a service provider to facilitate their lives through the Internet of Things (IoT). An obligatory thing for the service provider is that they should push the service data safely and timely to multiple IoT terminal devices regularly after the IoT devices accomplishing the service subscription. In order to control the service message received by the legal devices as while as keep the confidentiality of the data, the public key encryption algorithm is utilized. While the existing public encryption algorithms for push service are too complicated for IoT devices, and almost of the current subscription schemes based on push mode are relying on centralized organization which may suffer from centralized entity corruption or single point of failure. To address these issues, we design a secure subscription-push service scheme based on blockchain and edge computing in this article, which is decentralized with secure architecture for the subscription and push of service. Furthermore, inspired by broadcast encryption and multicast encryption, a new encryption algorithm is designed to manage the permissions of IoT devices together with smart contract, and to protect the confidentiality of push messages, which is suitable for IoT devices. The edge computing nodes, in the new system architecture, maintain the blockchain to ensure the impartiality and traceability of service subscriptions and push messages, meanwhile undertake some calculations for IoT devices with limited computing power. The legalities of subscription services are guaranteed by verifying subscription tags on the smart contract. Lastly, the analysis indicates that the scheme is reliable, and the proposed encryption algorithm is safe and efficient.
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Dawei Pan,Qiang Chen,Yinjuan Zhang,Bo Li 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.84 No.-
Millimeter-scale W1/O/W2 compound droplets generation in a co-flowing microfluidic device with onestepstructure was symmetrically observed through experiments, and the formation process isdistinguished according to the variation law of thread tip velocity. Specially, under a wide range ofoperation conditions, W1/O/W2 compound droplets form accompanying with the generation of oil phasedroplet. The formation ratio of compound droplets to oil phase droplet always depends on the outerphase Capillary number, Caw2, and theflow rate ratio, R, of middle to inner phases, and thus theflowpattern diagram is obtained. Further the influences of all phasesflow rates, outer phase viscosity as wellas the interfacial tension on the formation period and geometric sizes are extensively studied. Finally, aprediction correlation for dimensionless inner and outer diameters with several dimensionless numbersis also obtained. The results could provide an experimental basis for controllably preparing monodispersecompound droplets with millimeter-scale.
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