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A Real Plug-and-Play Fog: Implementation of Service Placement in Wireless Multimedia Networks

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China Communications 2019年第10期16卷 191-201页

作者： Jianwen Xu kaoru ota Mianxiong Dong Department of Sciences and Informatics Muroran Institute of Technology

Initially as an extension of cloud computing, fog computing has been inspiring new ideas about moving computing tasks to the edge of networks. In fog, we often repeat the procedure of placing services because of the geographical distribution of mobile users. We may not expect a fixed demand and supply relationship between users and service providers since users always prefer nearby service with less time delay and transmission consumption. That is, a plug-and-play service mode is what we need in fog. In this paper, we put forward a dynamic placement strategy for fog service to guarantee the normal service provision and optimize the Quality of Service (QoS). The simulation results show that our strategy can achieve better performance under metrics including energy consumption and end-to-end latency. Moreover, we design a real Plug-and-Play Fog (PnPF) based on Raspberry Pi and OpenWrt to provide fog services for wireless multimedia networks.

关键词： wireless multimedia networks fog computing service placement quality of service

Energy Efficiency of a Multi-Core Processor by Tag Reduction

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Journal of Computer Science & Technology 2011年第3期26卷 491-503页

作者：郑龙董冕雄 kaoru ota 金海 Song Guo 马俊 School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China School of Computer Science and Engineering The University of Aizu Aizu-Wakamatsu 965-8580 Japan Department of Electrical and Computer Engineering University of Waterloo N2L 3G1 Canada Department of Computer Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China

We consider the energy saving problem for caches on a multi-core processor. In the previous research on low power processors, there are various methods to reduce power dissipation. Tag reduction is one of them. This paper extends the tag reduction technique on a single-core processor to a multi-core processor and investigates the potential of energy saving for multi-core processors. We formulate our approach as an equivalent problem which is to find an assignment of the whole instruction pages in the physical memory to a set of cores such that the tag-reduction conflicts for each core can be mostly avoided or reduced. We then propose three algorithms using different heuristics for this assignment problem. We provide convincing experimental results by collecting experimental data from a real operating system instead of the traditional way using a processor simulator that cannot simulate operating system functions and the full memory hierarchy. Experimental results show that our proposed algorithms can save total energy up to 83.93% on an 8-core processor and 76.16% on a 4-core processor in average compared to the one that the tag-reduction is not used for. They also significantly outperform the tag reduction based algorithm on a single-core processor.

关键词： tag reduction multi-core processor energy efficiency

Event-Oriented Dynamic Security Service for Demand Response in Smart Grid Employing Mobile Networks

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China Communications 2015年第12期12卷 63-75页

作者： GUO Longhua DONG Mianxiong kaoru ota WU Jun LI Jianhua School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University Department of Information and ElectronicEngineering Muroran Institute of Technology

Equipped with millions of sensors and smart meters in smart gird,a reliable and resilient wireless communication technology is badly *** networks are among the major energy communication networks which contribute to global energy consumption increase *** one of core technologies of smart grid employing mobile networks,Demand Response(DR) helps improving efficiency,reliability and security for electric power grid *** of DR events is one of the most important issues in ***,the security requirements of different DR events are dynamic for variousactual *** address this,an event-oriented dynamic security service mechanism is proposed for *** kinds of security services including security access service,security communication service and security analysis service for DR event are composited dynamically by the fine-grained sub *** experiment prototype of the network of State Grid Corporation of China(SGCC) is *** and evaluations shows the feasibility and effectiveness of the proposed scheme in smart grid employing mobile network.

关键词： dynamically smart overhead infrastructure broadcast badly password electricity prototype authentication

Efficient Certificateless Authenticated Key Agreement for Blockchain-Enabled Internet of Medical Things

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Computers, Materials & Continua 2023年第4期75卷 2043-2059页

作者： Chaoyang Li Yanbu Guo Mianxiong Dong Gang Xu Xiu-Bo Chen Jian Li kaoru ota College of Software Engineering Zhengzhou University of Light IndustryZhengzhou450002China Department of Sciences and Informatics Muroran Institution of TechnologyMuroran050-8585Japan School of Computing Science and Technology North China University of TechnologyBeijing100144China Information Security Centre State Key Laboratory of Networking and Switching TechnologyBeijing University of Post and TelecommunicationsBeijing100876China

Internet of Medical Things(IoMT)plays an essential role in collecting and managing personal medical *** recent years,blockchain technology has put power in traditional IoMT systems for data sharing between different medical institutions and improved the utilization of medical ***,some problems in the information transfer process between wireless medical devices and mobile medical apps,such as information leakage and privacy *** paper first designs a cross-device key agreement model for blockchain-enabled *** model can establish a key agreement mechanism for secure medical data ***,a certificateless authenticated key agreement(KA)protocol has been proposed to strengthen the information transfer security in the cross-device key agreement *** proposed KA protocol only requires one exchange of messages between the two parties,which can improve the protocol execution ***,any unauthorized tampering of the transmitted signed message sent by the sender can be detected by the receiver,so this can guarantee the success of the establishment of a session key between the strange *** blockchain ledger can ensure that the medical data cannot be tampered with,and the certificateless mechanism can weaken the key escrow ***,the security proof and performance analysis are given,which show that the proposed model and KA protocol are more secure and efficient than other schemes in similar literature.

关键词： Certificateless key agreement authentication blockchain internet of medical things

SIoTFog:Byzantine-resilient IoT fog networking

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Frontiers of Information Technology & Electronic Engineering 2018年第12期19卷 1546-1557页

作者： Jian-wen XU kaoru ota Mian-xiong DONG An-feng LIU Qiang LI Department of Information and Electronic Engineering Muroran Institute of Technology School of Information Science and Engineering Central South University MOE Key Laboratory of Symbol Computation and Knowledge Engineering Jilin University

The current boom in the Internet of Things(IoT) is changing daily life in many ways, from wearable devices to connected vehicles and smart cities. We used to regard fog computing as an extension of cloud computing, but it is now becoming an ideal solution to transmit and process large-scale geo-distributed big data. We propose a Byzantine fault-tolerant networking method and two resource allocation strategies for IoT fog computing. We aim to build a secure fog network, called "SIoTFog," to tolerate the Byzantine faults and improve the efficiency of transmitting and processing IoT big data. We consider two cases, with a single Byzantine fault and with multiple faults, to compare the performances when facing different degrees of risk. We choose latency, number of forwarding hops in the transmission, and device use rates as the metrics. The simulation results show that our methods help achieve an efficient and reliable fog network.

关键词： Byzantine fault tolerance Fog computing Resource allocation Internet of Things(IoT)

Techniques for Avoiding Saccular Extended Obstruction at the Anastomotic Site of Functional End-to-End Anastomosis

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Surgical Science 2017年第7期8卷 305-311页

作者： Koichi Yoshida Kenichi Ietsugu Jyunpei Okamoto Saki Hayashi Yoshihide Asaumi Naohiro ota Hiroyuki Sugawara Satoshi Tabata Masahiro Kaneki Mitsuaki Sakatoku kaoru Kiyohara Department of Surgery Tonami General Hospital Toyama Japan

Saccular extended obstruction is generated when the anastomotic site of functional end-to-end anastomosis is extended saccularly and blocked by intestinal contents. This is a specific complication of functional end-to-end anastomosis. Saccular extended obstruction of the anastomotic site of func-tional end-to-end anastomosis causes postoperative intestinal obstruction. Saccular extended obstruction places a heavy burden on patients because surgery is necessary for treatment of intestinal obstruction due to saccular extended obstruction. However, saccular extended obstruction is not a commonly recognized complication. The greatest factor contributing to the development of saccular extended obstruction is an acute angle between the portions of the intestinal tract oral and aboral to the anastomotic site. When this angle approaches obtuse angle, preferably close to a straight line, stagnation of the intestinal contents does not occur at the anastomotic site of functional end-to-end anastomosis and saccular extended obstruction is avoided. For making the angle of anastomotic intestinal tracts obtuse or straight, it may be effective that the entry hole of stapling suture instrument creating the anastomotic stoma is closed perpendicular to the intestinal axis.

关键词： Functional End-to-End Anastomosis Stapling Anastomosis Anastomosis Postoperative Complication Intestinal Obstruction