期刊文献+
共找到7篇文章
< 1 >
每页显示 20 50 100
BC-AKA:Blockchain Based Asymmetric Authentication and Key Agreement Protocol for Distributed 5G Core Network
1
作者 Zhen Gao Dongbin Zhang +3 位作者 Jiuzhi Zhang Zhao liu haoming liu Ming Zhao 《China Communications》 SCIE CSCD 2022年第6期66-76,共11页
Secure authentication between user equipment and 5G core network is a critical issue for 5G system.However,the traditional authentication protocol 5 G-AKA and the centralized key database are at risk of several securi... Secure authentication between user equipment and 5G core network is a critical issue for 5G system.However,the traditional authentication protocol 5 G-AKA and the centralized key database are at risk of several security problems,e.g.key leakage,impersonation attack,MitM attack and single point of failure.In this paper,a blockchain based asymmetric authentication and key agreement protocol(BC-AKA)is proposed for distributed 5G core network.In particular,the key used in the authentication process is replaced from a symmetric key to an asymmetric key,and the database used to store keys in conventional 5G core network is replaced with a blockchain network.A proof of concept system for distributed 5G core network is built based on Ethereum and ECC-Secp256 k1,and the efficiency and effectiveness of the proposed scheme are verified by the experiment results. 展开更多
关键词 blockchain asymmetric authentication key agreement distributed core network 5G
下载PDF
Coordinate Control Strategy for Current Stabilization in an Aluminum Smelter Including on Load Tap Changer
2
作者 Heping Xu Qipin Xu +1 位作者 Yuan Gao haoming liu 《Energy and Power Engineering》 2013年第4期1410-1414,共5页
The performance of the current stabilization control system in an aluminum smelter affects the quality and the quantity of the electrolytic products. This paper elaborates the power supply, in which the diode rectifie... The performance of the current stabilization control system in an aluminum smelter affects the quality and the quantity of the electrolytic products. This paper elaborates the power supply, in which the diode rectifiers and the self-saturable reactors could keep the series current stable, then describes the basic principle of the rectifier unit control and the series current control. A coordinate strategy is proposed to keep the series current stable, the self-saturable reactors are controlled by a proportional-integral control scheme and the on load tap changers of transformer are triggered by the errors between the setting value of the series voltage and the measured values of the series voltage. Simulation results on PSCAD/EMTDC show that the effectiveness of the proposed strategy to keep the series current stable. 展开更多
关键词 CURRENT STABILIZATION Diode Rectifier Self-saturable Reactor OLTC COORDINATE Control
下载PDF
The Online Assessment of Electric Distribution Network Load Capability
3
作者 haoming liu Zhenkun Li +1 位作者 Kun Yu Xingying Chen 《Journal of Electromagnetic Analysis and Applications》 2009年第1期42-47,共6页
To improve the security and reliability of a distribution network, several issues, such as influences of operation con-strains, real-time load margin calculation, and online security level evaluation, are with great s... To improve the security and reliability of a distribution network, several issues, such as influences of operation con-strains, real-time load margin calculation, and online security level evaluation, are with great significance. In this pa-per, a mathematical model for load capability online assessment of a distribution network is established, and a repeti-tive power flow calculation algorithm is proposed to solve the problem as well. With assessment on three levels: the entire distribution network, a sub-area of the network and a load bus, the security level of current operation mode and load transfer capability during outage are thus obtained. The results can provide guidelines for prevention control, as well as restoration control. Simulation results show that the method is simple, fast and can be applied to distribution networks belonged to any voltage level while taking into account all of the operation constraints. 展开更多
关键词 Distribution Network Online Security Assessment LOADING CAPABILITY Variable STEP-SIZE REPETITIVE Power Flow LOAD TRANSFER
下载PDF
Distribution Locational Marginal Pricing Based Equilibrium Optimization Strategy for Data Center Park with Spatial-temporal Demand-side Resources
4
作者 Zhihao Yang Anupam Trivedi +2 位作者 Ming Ni haoming liu Dipti Srinivasan 《Journal of Modern Power Systems and Clean Energy》 SCIE EI CSCD 2023年第6期1959-1970,共12页
This paper proposes a distribution locational marginal pricing(DLMP) based bi-level Stackelberg game framework between the internet service company(ISC) and distribution system operator(DSO) in the data center park. T... This paper proposes a distribution locational marginal pricing(DLMP) based bi-level Stackelberg game framework between the internet service company(ISC) and distribution system operator(DSO) in the data center park. To minimize electricity costs, the ISC at the upper level dispatches the interactive workloads(IWs) across different data center buildings spatially and schedules the battery energy storage system temporally in response to DLMP. Photovoltaic generation and static var generation provide extra active and reactive power. At the lower level, DSO calculates the DLMP by minimizing the total electricity cost under the two-part tariff policy and ensures that the distribution network is uncongested and bus voltage is within the limit. The equilibrium solution is obtained by converting the bi-level optimization into a single-level mixed-integer second-order cone programming optimization using the strong duality theorem and the binary expansion method. Case studies verify that the proposed method benefits both the DSO and ISC while preserving the privacy of the ISC. By taking into account the uncertainties in IWs and photovoltaic generation, the flexibility of distribution networks is enhanced, which further facilitates the accommodation of more demand-side resources. 展开更多
关键词 Bi-level optimization congestion management data center demand response distribution locational marginal pricing(DLMP) robust optimization
原文传递
High-yield and low-cost separation of high-purity semiconducting single-walled carbon nanotubes with closed-loop recycling of raw materials and solvents 被引量:1
5
作者 Fang liu Xingxing Chen +8 位作者 haoming liu Jie Zhao Meiqi Xi Hongshan Xiao Tongkang Lu Yu Cao Yan Li Lianmao Peng Xuelei Liang 《Nano Research》 SCIE EI CSCD 2021年第11期4281-4287,共7页
Semiconducting single-walled carbon nanotubes (s-SWCNTs) are the foundation of CNT-based electronics and optoelectronics. For practical applications, s-SWCNTs should be produced with high purity, high structural quali... Semiconducting single-walled carbon nanotubes (s-SWCNTs) are the foundation of CNT-based electronics and optoelectronics. For practical applications, s-SWCNTs should be produced with high purity, high structural quality, low cost, and high yield. Currently conjugated polymer wrapping method shows great potential to fulfill these requirements due to its advantages of simple operation process, high purity separation, and easy scaling-up. However, only a small portion of both CNTs and polymers go into the final solution, and most of them are discarded after a single use, resulting in high cost and low yield. In this paper, we introduce a closed-loop recycling strategy, in which raw materials (CNTs and polymers) and solvents were all recycled and reused for multiple separation cycles. In each cycle, high-purity (> 99.9%) s-SWCNTs were obtained with no significant change of structural quality. After 7 times of recycling and separation, the material cost was reduced to ∼ 1% in comparison with commercially available products, and total yield was increased to 36% in comparison with 2%–5% for single cycle separation. Our proposed closed-loop recycling strategy paves the way for low-cost and high-yield mass production of high-quality s-SWCNTs. 展开更多
关键词 carbon nanotubes closed-loop recycling high-yield LOW-COST high purity
原文传递
Large-size niobium disulfide nanoflakes down to bilayers grown by sulfurization 被引量:2
6
作者 Zhen Li Wencao Yang +7 位作者 Yaroslav Losovyj Jun Chen Enzhi Xu haoming liu Madilynn Werbianskyj Herbert A. Fertig Xingchen Ye Shixiong Zhang 《Nano Research》 SCIE EI CAS CSCD 2018年第11期5978-5988,共11页
原文传递
Single-walled carbon nanotube based SERS substrate with single molecule sensitivity
7
作者 Chenmaya Xia Daqi Zhang +8 位作者 Henan Li Sheng Li haoming liu Li Ding Xiyan liu Min Lyu Ruoming Li Juan Yang Yan Li 《Nano Research》 SCIE EI CSCD 2022年第1期694-700,共7页
In single molecule study,surface-enhanced Raman scattering(SERS)has the advantage of specifically providing structural information of the molecules targeted.The main challenge in single molecule SERS is developing reu... In single molecule study,surface-enhanced Raman scattering(SERS)has the advantage of specifically providing structural information of the molecules targeted.The main challenge in single molecule SERS is developing reusable plasmonic substrates that ensures single molecule sensitivity and acquires intrinsic information of molecules.Here,we proposed a strategy to utilize single-walled carbon nanotubes(SWNTs)to construct SERS substrates.Employing ultrasonic spray pyrolysis,we prepared in situ polyhedral gold nanocrystals closely spaced and attached to nanotubes,ensuring valid hot spots formed along the tube-walls.With such SERS substrates,we proved the single molecule detection by the statistical analysis based on the natural abundance of isotopes.Since SWNTs provide non-chemical bonding adsorption sites,our SERS substrates are easily reusable and have a unique advantage of preserving the intrinsic property of the molecules detected.Using SWNTs to build SERS substrates may become a powerful general strategy in various static and dynamic studies of single molecules. 展开更多
关键词 GOLD single-walled carbon nanotubes surface-enhanced Raman scattering single molecule studies
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部