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Secure smart contract-based digital twins for the Internet of Things

Blockchain(Research and Applications) 2024年第1期5卷 39-49页

作者： Iakovos Pittaras Nikos Fotiou Christos Karapapas vasilios a.siris George C.Polyzos Mobile Multimedia Laboratory Department of InformaticsSchool of Information Sciences and TechnologyAthens University of Economics and BusinessAthens10434Greece School of Data Science The Chinese University of Hong KongShenzhen518172China

The proliferation of Internet of Things(IoT)devices that operate unattended providing a multitude of important and often sensitive services highlights the need for seamless interoperability and increased *** argue that digital twins of IoT devices,with the right design,can enhance the security,reliability,auditability,and interoperability of IoT *** salient features of digital twins have made them key elements for the IoT and Industry *** this paper,we leverage advances in W3C’s Web of Things(WoT)standards and distributed ledger technologies(DLTs)to present a novel design of the smart contract-based digital twins with enhanced security,transparency,interoperability,and *** provide two different variations of that general design using two different blockchains(one public and one private,permissioned blockchain),and we present design ***,we introduce an architecture for accessing and controlling IoT devices securely and reliably,providing full auditability,while at the same time using the proposed digital twins as an indirection mechanism(proxy).The proposed architecture leverages the blockchain to offer notable properties,namely,decentralization,immutability,auditability,non-repudiation,availability,and ***,it introduces mass actuation,easier management of IoT devices,and enhanced security to the IoT gateways,enables new business models,and makes consumer devices(vendor-)agnostic.

关键词： Digital twins Internet of Things Web of Things Distributed ledger technologies Hyperledger Fabric Ethereum

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A privacy-preserving statistics marketplace using local differential privacy and blockchain: An application to smart-grid measurements sharing

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Blockchain(Research and Applications) 2021年第1期2卷 56-64页

作者： Nikos Fotiou Iakovos Pittaras vasilios a.siris George C.Polyzos Priit Anton Mobile Multimedia Laboratory Department of InformaticsSchool of Information Sciences and TechnologyAthens University of Economics and BusinessAthens10434Greece Guardtime A.H.Tammsaare tee 60Tallinn11316Estonia

Service providers usually require detailed statistics in order to improve their *** the other hand,privacy concerns are intensifying and sensitive data is protected by legislation,such as GDPR(General Data Protection Regulation).In this paper,we present the design,implementation,and evaluation of a marketplace that allows“data consumers”to buy information from“data providers”,which can then be used for generating meaningful ***,our system enables“system operators”that can select which data providers are allowed to provide data,based on filtering criteria specified by the data *** leverage local differential privacy to protect the data provider's privacy against data consumers,as well as against system operators,and we build a blockchain-based solution for ensuring fair exchange,and immutable data *** design targets use cases that involve hundreds or even thousands of data *** prove the feasibility of our approach through a proof-of concept implementation of a measurement sharing application for smart-grid systems.

关键词： Auditability Ethereum Fair exchange Smart contracts

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骨密度测量中精密度的重要性

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中国骨质疏松杂志 2002年第1期8卷 94-96,89页

作者： Sydney Lou Bonnick C.Conrad Johnston Michael Kleerekoper Robert Lindsay Paul Miller Louis Sherwood Ethel siris 周琦程晓光 Texas Woman’s University Indiana University School of Medicine Wayne State University School of Medicine Columbia University University of Colorado Health Science Center Merck & Co.West Point 上海第六人民医院骨疏松中心北京积水潭医院

骨密度测定 ,不论采取何特殊技术 ,即使严格地按照厂家建议的操作程序 ,也常常不能达到完美的重复性。必须确定每台骨密度仪不同骨骼部位的精确度。精密度 ,如标准差平均方根或变异系数平均方根 ,被用来确定骨密度的变化 ,即精密度决定... 详细信息

骨密度测定 ,不论采取何特殊技术 ,即使严格地按照厂家建议的操作程序 ,也常常不能达到完美的重复性。必须确定每台骨密度仪不同骨骼部位的精确度。精密度 ,如标准差平均方根或变异系数平均方根 ,被用来确定骨密度的变化 ,即精密度决定最小显著性变化值和随访需要的至少时间间隔。除非确定了精密度 ,否则就不能确定任何水平的统计可信度最小显著性变化值。

关键词：精密度骨密度系列测定法

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