A number of mobile Online Social Networking （OSN） services have appeared in the market in recent times. While most mobile systems benefit greatly from cloud services, centralized servers and communications infrastru...A number of mobile Online Social Networking （OSN） services have appeared in the market in recent times. While most mobile systems benefit greatly from cloud services, centralized servers and communications infrastructure is not always available. Nor are location-based services offered to mobile devices without GPS. To take advantage of cloud and to address these problems, a Wi-Fi based multihop networking system called MoNet is proposed. On top of MONET we propose a privacy-aware geosocial networking service called WiFace. Where there is no infrastructure, a distributed content sharing protocol significantly shortens the relay path, reduces conflicts, and improves data availability. Furthermore, a security mechanism is developed to protect privacy. Comprehensive experiments performed on MoNet show that the system is more than sufficient to support social networking and even audio and video applications.展开更多
Recent years have witnessed an increasing interest in the blockchain technology,and many blockchain-based applications have been developed to take advantage of its decentralization,transparency,fault tolerance,and str...Recent years have witnessed an increasing interest in the blockchain technology,and many blockchain-based applications have been developed to take advantage of its decentralization,transparency,fault tolerance,and strong security.In the field of smart grids,a plethora of proposals have emerged to utilize blockchain for aug-menting intelligent energy management,energy trading,security and privacy protection,microgrid management,and energy vehicles.Compared with traditional centralized approaches,blockchain-based solutions are able to exploit the advantages of blockchain to realize better functionality in smart grids.However,the blockchain tech-nology itself has its disadvantages in low processing throughput and weak privacy protection.Therefore,it is of paramount importance to study how to integrate blockchain with smart grids in a more effective way so that the advantages of blockchain can be maximized and its disadvantages can be avoided.This article surveys the state-of-the-art solutions aiming to integrate the emergent blockchain technology with smart grids.The goal of this survey is to discuss the necessity of applying blockchain in different components of smart grids,identify the challenges encountered by current solutions,and highlight the frameworks and techniques used to integrate blockchain with smart grids.We also present thorough comparison studies among blockchain-based solutions for smart grids from different perspectives,with the aim to provide insights on inte-grating blockchain with smart grids for different smart grid management tasks.Finally,we list the current projects and initiatives demonstrating the current effort from the practice side.Additionally,we draw attention to open problems that have not yet been tackled by existing solutions,and point out possible future research directions.展开更多
基金supported by National Natural Science Foundation of China under Grant No. 90818021, and 9071803National Natural Science Foundation of China under Grant No. 60828003+3 种基金supported by Tsinghua National Laboratory for Information Science and Technology(TNList)NSF CNS0832120National Basic Research Program of China ("973"Program) under grant No. 2010CB328100the National High Technology Research and Development Program of China ("863"Program) under grant No. 2007AA01Z180
文摘A number of mobile Online Social Networking （OSN） services have appeared in the market in recent times. While most mobile systems benefit greatly from cloud services, centralized servers and communications infrastructure is not always available. Nor are location-based services offered to mobile devices without GPS. To take advantage of cloud and to address these problems, a Wi-Fi based multihop networking system called MoNet is proposed. On top of MONET we propose a privacy-aware geosocial networking service called WiFace. Where there is no infrastructure, a distributed content sharing protocol significantly shortens the relay path, reduces conflicts, and improves data availability. Furthermore, a security mechanism is developed to protect privacy. Comprehensive experiments performed on MoNet show that the system is more than sufficient to support social networking and even audio and video applications.
文摘Recent years have witnessed an increasing interest in the blockchain technology,and many blockchain-based applications have been developed to take advantage of its decentralization,transparency,fault tolerance,and strong security.In the field of smart grids,a plethora of proposals have emerged to utilize blockchain for aug-menting intelligent energy management,energy trading,security and privacy protection,microgrid management,and energy vehicles.Compared with traditional centralized approaches,blockchain-based solutions are able to exploit the advantages of blockchain to realize better functionality in smart grids.However,the blockchain tech-nology itself has its disadvantages in low processing throughput and weak privacy protection.Therefore,it is of paramount importance to study how to integrate blockchain with smart grids in a more effective way so that the advantages of blockchain can be maximized and its disadvantages can be avoided.This article surveys the state-of-the-art solutions aiming to integrate the emergent blockchain technology with smart grids.The goal of this survey is to discuss the necessity of applying blockchain in different components of smart grids,identify the challenges encountered by current solutions,and highlight the frameworks and techniques used to integrate blockchain with smart grids.We also present thorough comparison studies among blockchain-based solutions for smart grids from different perspectives,with the aim to provide insights on inte-grating blockchain with smart grids for different smart grid management tasks.Finally,we list the current projects and initiatives demonstrating the current effort from the practice side.Additionally,we draw attention to open problems that have not yet been tackled by existing solutions,and point out possible future research directions.
