Chaining watermark is an effective way to verify the integrity of streaming data in wireless network environment,especially in resource-constrained sensor networks,such as the perception layer of Internet of Things ap...Chaining watermark is an effective way to verify the integrity of streaming data in wireless network environment,especially in resource-constrained sensor networks,such as the perception layer of Internet of Things applications.However,in all existing single chaining watermark schemes,how to ensure the synchronization between the data sender and the receiver is still an unsolved problem.Once the synchronization points are attacked by the adversary,existing data integrity authentication schemes are difficult to work properly,and the false negative rate might be up to 50 percent.And the additional fixed group delimiters not only increase the data size,but are also easily detected by adversaries.In this paper,we propose an effective dual-chaining watermark scheme,called DCW,for data integrity protection in smart campus IoT applications.The proposed DCW scheme has the following three characteristics:(1)In order to authenticate the integrity of the data,fragile watermarks are generated and embedded into the data in a chaining way using dynamic grouping;(2)Instead of additional fixed group delimiters,chained watermark delimiters are proposed to synchronize the both transmission sides in case of the synchronization points are tampered;(3)To achieve lossless integrity authentication,a reversible watermarking technique is applied.The experimental results and security analysis can prove that the proposed DCW scheme is able to effectively authenticate the integrity of the data with free distortion at low cost in our smart meteorological Internet of Things system.展开更多
Self-assembled chain-like nanostructures utilizing localized surface plasmon resonance(LSPR)effect could enhance the local electromagnetic field for energy transfer,which provides huge structural advantages for some t...Self-assembled chain-like nanostructures utilizing localized surface plasmon resonance(LSPR)effect could enhance the local electromagnetic field for energy transfer,which provides huge structural advantages for some transmission-related applications such as photocatalysis.In this work,the dual-chain structure of Au chain wrapped CuS(denoted as Au Chain@CuS)was successfully synthesized by the one-step hydrothermal method.Namely,L-cysteine is used as the sulfur source and linking agent,and copper nitrate is the precursor of copper ions,forming the dual-chain driven by 15 nm uniform Au seeds.Transient absorption spectroscopy(TAS)and finite-difference-time-domain(FDTD)simulation exhibited the highly intensive electromagnetic field around the self-assembly chain,the raised formation and transfer rate of electron–hole pairs between the Au chain and surrounding CuS chain.Meanwhile,it shows an excellent photodegradation activity on dye rhodamine B(RhB).Within 1 h under simulated sunlight,the degradation rate reached 98.81%in Au Chain@CuS,which is 2.27 times higher compared to the bare CuS.The enhanced performance is mainly attributed to the near-field enhancement effect induced by LSPR,as well as the benefits of more effective resonance energy transfer(RET).This research comprehensively shows the electromagnetic field in LSPR metal chain is more intensive by order of magnitude relative to the isolated particles.Simultaneously the continuous CuS chain wrapped outside of the LSPR source effectively absorbs and utilizes the plasmonic energy,then promotes the formation of the photo-generated charge,thus increasing the photocatalytic performance.This founding of wrapped coupled-metal dual-chain provides a promising candidate for the highly efficient photocatalysts.展开更多
The power market’s construction necessitates taking into account the link between medium and long-term transactions to the spot market during its transition phase.The purpose of this article is to assess the compatib...The power market’s construction necessitates taking into account the link between medium and long-term transactions to the spot market during its transition phase.The purpose of this article is to assess the compatibility and unification between the electricity spot market and the medium to long-term transaction market,and to propose a dual-chain transaction structure to guarantee the safety and adaptability of transactions.A new power transaction model is devised to guarantee that both sides in the transaction are apportioning electricity with the aim ofmaximizing the interests of both,due to the unequal allotment of electricity between the spot and medium to long-term markets.The blockchain’s credit data,coupled with the power balance constraint,allows for the screening of the relevant transaction parties and confirmation of the transaction price after the Electricity distribution.Subsequently,a series of smart contracts are created to address the trust issues caused by central institutions’interference in traditional transactions,and guarantee the reliability and steadiness of transaction data through a consensus process.展开更多
基金This work is supported by the Major Program of the National Social Science Fund of China under Grant No.17ZDA092by the Electronic Information and Control of Fujian University Engineering Research Center Fund under Grant No.EIC1704+3 种基金by the National Key R&D Program of China under grant 2018YFB1003205by the National Natural Science Foundation of China under grant 61173136,U1836208,U1536206,U1836110,61602253,61672294by the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)fundby the Collaborative Innovation Center of Atmospheric Environment and Equipment Technology(CICAEET)fund,China.
文摘Chaining watermark is an effective way to verify the integrity of streaming data in wireless network environment,especially in resource-constrained sensor networks,such as the perception layer of Internet of Things applications.However,in all existing single chaining watermark schemes,how to ensure the synchronization between the data sender and the receiver is still an unsolved problem.Once the synchronization points are attacked by the adversary,existing data integrity authentication schemes are difficult to work properly,and the false negative rate might be up to 50 percent.And the additional fixed group delimiters not only increase the data size,but are also easily detected by adversaries.In this paper,we propose an effective dual-chaining watermark scheme,called DCW,for data integrity protection in smart campus IoT applications.The proposed DCW scheme has the following three characteristics:(1)In order to authenticate the integrity of the data,fragile watermarks are generated and embedded into the data in a chaining way using dynamic grouping;(2)Instead of additional fixed group delimiters,chained watermark delimiters are proposed to synchronize the both transmission sides in case of the synchronization points are tampered;(3)To achieve lossless integrity authentication,a reversible watermarking technique is applied.The experimental results and security analysis can prove that the proposed DCW scheme is able to effectively authenticate the integrity of the data with free distortion at low cost in our smart meteorological Internet of Things system.
基金This research was funded by the National Key R&D Program of China(No.2018YFA0209200).
文摘Self-assembled chain-like nanostructures utilizing localized surface plasmon resonance(LSPR)effect could enhance the local electromagnetic field for energy transfer,which provides huge structural advantages for some transmission-related applications such as photocatalysis.In this work,the dual-chain structure of Au chain wrapped CuS(denoted as Au Chain@CuS)was successfully synthesized by the one-step hydrothermal method.Namely,L-cysteine is used as the sulfur source and linking agent,and copper nitrate is the precursor of copper ions,forming the dual-chain driven by 15 nm uniform Au seeds.Transient absorption spectroscopy(TAS)and finite-difference-time-domain(FDTD)simulation exhibited the highly intensive electromagnetic field around the self-assembly chain,the raised formation and transfer rate of electron–hole pairs between the Au chain and surrounding CuS chain.Meanwhile,it shows an excellent photodegradation activity on dye rhodamine B(RhB).Within 1 h under simulated sunlight,the degradation rate reached 98.81%in Au Chain@CuS,which is 2.27 times higher compared to the bare CuS.The enhanced performance is mainly attributed to the near-field enhancement effect induced by LSPR,as well as the benefits of more effective resonance energy transfer(RET).This research comprehensively shows the electromagnetic field in LSPR metal chain is more intensive by order of magnitude relative to the isolated particles.Simultaneously the continuous CuS chain wrapped outside of the LSPR source effectively absorbs and utilizes the plasmonic energy,then promotes the formation of the photo-generated charge,thus increasing the photocatalytic performance.This founding of wrapped coupled-metal dual-chain provides a promising candidate for the highly efficient photocatalysts.
文摘The power market’s construction necessitates taking into account the link between medium and long-term transactions to the spot market during its transition phase.The purpose of this article is to assess the compatibility and unification between the electricity spot market and the medium to long-term transaction market,and to propose a dual-chain transaction structure to guarantee the safety and adaptability of transactions.A new power transaction model is devised to guarantee that both sides in the transaction are apportioning electricity with the aim ofmaximizing the interests of both,due to the unequal allotment of electricity between the spot and medium to long-term markets.The blockchain’s credit data,coupled with the power balance constraint,allows for the screening of the relevant transaction parties and confirmation of the transaction price after the Electricity distribution.Subsequently,a series of smart contracts are created to address the trust issues caused by central institutions’interference in traditional transactions,and guarantee the reliability and steadiness of transaction data through a consensus process.
