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High-Speed Railway 2024年第1期2卷 51-56页

作者： Xiangru Lyu Xunxiao Yin Kun Wang Yongwen Wei Institute of Computing Technologies China Academy of Railway Sciences Corporation LimitedBeijing 100081China

In view of the problems of inconsistent data semantics,inconsistent data formats,and difficult data quality assurance between the railway engineering design phase and the construction and operation phase,as well as the difficulty in fully realizing the value of design results,this paper proposes a design and implementation scheme for a railway engineering collaborative design platform.The railway engineering collaborative design platform mainly includes functional modules such as metadata management,design collaboration,design delivery management,model component library,model rendering services,and Building Information Modeling(BIM)application services.Based on this,research is conducted on multi-disciplinary parameterized collaborative design technology for railway engineering,infrastructure data management and delivery technology,and design multi-source data fusion and application technology.The railway engineering collaborative design platform is compared with other railway design software to further validate its advantages and advanced features.The platform has been widely applied in multiple railway construction projects,greatly improving the design and project management efficiency.

关键词： Railway engineering Metadata data delivery Collaborative designplatform Design results BIM services

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Timely data delivery for Energy-Harvesting IoT Devices

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Chinese Journal of Electronics 2022年第2期31卷 322-336页

作者： LU Wenwei GONG Siliang ZHU Yihua School of Computer Science and Technology Zhejiang University of Technology College of Mathematics and Computer Science Zhejiang A&F University

The devices in the Internet of things(Io T) gain capability of sustainable operation when they harvest energy from ambient sources. Fluctuation in the harvested energy may cause the energy-harvesting IoT devices to suffer from frequent energy shortage, which may bring in intolerable packet delay or packet discarding. It is important to design a low-delay packet delivery scheme that adapts to variation in the harvested energy.In this paper, we present the timely data delivery(TDD)scheme for the IoT devices. Using Markov chain, we develop a probability model for the TDD scheme, which leads to the expected number of packets delivered in an operation cycle, the expected numbers of packets waiting in the data buffer in an operation cycle and an energy-harvesting cycle, and the expected packet delay. Additionally, we formulate the optimization problem that minimizes the packet delay in the TDD scheme, and the solution to the optimization problem yields the optimal parameters for the IoT devices to determine when to harvest energy and when to deliver data under the TDD scheme.The simulation results show that the proposed TDD scheme outperforms the existing schemes in terms of packet delay.

关键词： Internet of things Energy harvesting data delivery Energy management IEEE 802.15.4 standard

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Crowd sensing data delivery based on tangle DAG network

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The Journal of China Universities of Posts and Telecommunications 2023年第3期30卷 88-98页

作者： Chen Hui Jiang Xiaoling Wu Tianting Mou Xingyu Operation Monitoring Department Jilin Province Meteorological Information Network CenterChangchun 130062China Appraisal Department Jilin Province Meteorological Disaster Prevention Technology CenterChangchun 130062China

In view of the fact that current data delivery methods are not enough to meet the security requirements of today’s distributed crowd sensing,and the data delivery methods are not flexible enough,this paper proposes a crowd sensing data interaction method based on tangle directed acyclic graph(DAG)network.In this method,users and platforms are regarded as nodes of the network in the process of performing crowd sensing tasks.First,the heaviest chain is generated through the main chain strategy to ensure the stability of the network.Then,the hidden Markov model(HMM)prediction model is used to improve the correlation of the perceived data to improve the performance.Then,the confidential transaction and commitment algorithm is used to ensure the reliability of the transaction,overcome the security risks faced by the trusted third party,and simplify the group intelligence aware transaction mode.Finally,through simulation experiments,the security and feasibility of the group intelligence aware data delivery method based on tangle DAG network are verified.

关键词： data delivery crowd sensing tangle directed acyclic graph(DAG) confidential transactions

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Improving Throughput of Communication Link in IEEE 802.15.4 Based Energy-Harvesting Wireless Sensor Network

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Chinese Journal of Electronics 2019年第4期28卷 841-849页

作者： BAI Nana GONG Siliang SHI Haiyan CHENG Zhen ZHU Yihua School of Computer Science and Technology Zhejiang University of Technology School of Mechanical and Electrical Engineering Shaoxing University

It is critical to design a reliable packet transmission scheme to improve throughput in Energy harvesting Wireless sensor network(EH-WSN) or Battery free Wireless sensor network(BF-WSN). We present the Optimal size and rate(OSR) scheme to improve throughput of communication links in the IEEE 802.15.4 based BF-WSN that harvests radio frequency energy.Based on the defined truncated geometrical distribution,we formulate the optimization problem that maximizes the effective throughput of communication link. The solution of the optimization problem yields the optimal triple,namely the optimal packet size, data rate, and Maximum number of transmission trials(MNTT), which is used in the OSR so that throughput is considerably improved.Simulation results show the OSR scheme can improve throughput.

关键词： Wireless sensor network Energy harvesting Wireless sensor network data delivery Throughput

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