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Design and Implementation of an Adaptive Feedback Queue Algorithm over Open Flow Networks

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China Communications 2018年第7期15卷 168-179页

作者： jiawei wu Xiuquan Qiao Junliang Chen Beijing University of Posts and Telecommunications Beijing 100876China

The concurrent presence of different types of traffic in multimedia applications might aggravate a burden on the underlying data network, which is bound to affect the transmission quality of the specified traffic. Recently, several proposals for fulfilling the quality of service(QoS) guarantees have been presented. However, they can only support coarse-grained QoS with no guarantee of throughput, jitter, delay or loss rate for different applications. To address these more challenging problems, an adaptive scheduling algorithm for Parallel data Processing with Multiple Feedback(PPMF) queues based on software defined networks(SDN) is proposed in this paper, which can guarantee the quality of service of high priority traffic in multimedia applications. PPMF combines the queue bandwidth feedback mechanism to realise the automatic adjustment of the queue bandwidth according to the priority of the packet and network conditions, which can effectively solve the problem of network congestion that has been experienced by some queues for a long time. Experimental results show PPMF significantly outperforms other existing scheduling approaches in achieving 35--80% improvement on average time delay by adjusting the bandwidth adaptively, thus ensuring the transmission quality of the specified traffic and avoiding effectively network congestion.

关键词： multimedia streams software defined networks quality of service priority-based adaptive feedback queues

3D flame-retardant skeleton reinforced polymer electrolyte for solid-state dendrite-free lithium metal batteries

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Journal of Energy Chemistry 2022年第8期31卷 174-181,I0006页

作者： Xiaojiao Zheng jiawei wu Jing Chen Xiaodong Wang Zhenglong Yang Shanghai Key Laboratory of D&A for Metal-Functional Materials School of Materials Science and EngineeringTongji UniversityShanghai 200092China Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology&School of Physics Science and Engineering Tongji UniversityShanghai 200092China

For solid polymer electrolytes(SPEs),improving their mechanical and electrochemical properties is the key to obtaining batteries with higher safety and higher energy ***,a novel synergistic strategy proposed is preparing a 3D flame-retardant skeleton(3DPA)and adding nano-multifunctional fillers(Li-ILs@ZIF-8).In addition to providing mechanical support for the polyethylene oxide(PEO)matrix,3DPA also has further contributed to the system’s flame retardancy and further improved the ***,the electrochemical performance is fully guaranteed by rigid Li-ILs@ZIF-8,which provides fast migration channels forLi^(+),reduces the crystallinity of PEO and effectively inhibits lithium *** limiting oxygen index of the optimal sample(PL3Z/PA)is as high as 20.5%,and the ionic conductivity reaches 2.89×10^(-4) and 0.91×10^(-3) S cm^(-1) at 25 and 55°C,*** assembled Li|PL3Z/PA|Li battery can be cycled stably for more than 1000 h at a current density of 0.1 m A cm^(-2) without short circuit being pierced by lithium *** specific capacity of the LFP|PL3Z/PA|Li battery was 160.5 m Ah g^(-1) under a current density of 0.5 C,and the capacity retention rate was 90.0%after 300 cycles.

关键词： Solid polymer electrolytes Polyethylene oxide 3D flame-retardant skeleton Multifunctional fillers Synergistic effect

Quantum secure direct communication with entanglement source and single-photon measurement

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Science China(Physics,Mechanics & Astronomy) 2020年第11期63卷 12-19页

作者： Lu Yang jiawei wu ZaiSheng Lin LiuGuo Yin GuiLu Long State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics Tsinghua UniversityBeijing 100084China Frontier Science Center for Quantum Information Beijing 100084China School of Information and Technology Tsinghua UniversityBeijing 100084China Beijing National Research Center for Information Science and Technology Beijing 100084China Beijing Academy of Quantum Information Sciences Beijing 100093China

Quantum secure direct communication(QSDC)transmits information directly over a quantum *** addition to security in transmission,it avoids loopholes of key loss and prevents the eavesdropper from getting *** this article,we propose a QSDC protocol using entangled photon *** protocol differs from existing entanglement-based QSDC protocols because it does not perform Bell-state measurement,and one photon of the entangled pair is measured after the entanglement *** has the advantage of high signal-to-noise ratio due to the heralding function of entanglement pairs,and it also has the relative ease in performing single-photon *** protocol can use a practical entanglement source from spontaneous parametric down-conversion(SPDC);Gottesman-Lo-Lu¨tkenhaus-Preskill theory and the decoy state method give a better estimate of the error *** analysis is completed with Wyner’s wiretap channel theory,and the lower bound of the secrecy capacity is *** simulations were carried out to study the performance of the *** simulations demonstrated that the protocol with a practical SPDC entanglement source performed well and was close to the case with an ideal entanglement source.

关键词： quantum secure direct communication quantum secure communication quantum communication quantum information

Advanced Fiber Materials for Wearable Electronics

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Advanced Fiber Materials 2023年第1期5卷 12-35页

作者： Chuang Zhu jiawei wu Jianhua Yan Xuqing Liu Department of Materials School of Natural SciencesUniversity of ManchesterOxford RdManchester M139PLUK Key Laboratory of Textile Science&Technology Ministry of EducationCollege of TextilesDonghua UniversityShanghai 201620People’s Republic of China

Fiber materials are highly desirable for wearable electronics that are expected to be flexible and *** with rigid and planar electronic devices,fiber-based wearable electronics provide significant advantages in terms of flexibility,stretchability and breathability,and they are considered as the pioneers in the new generation of soft *** con-vergence of textile science,electronic engineering and nanotechnology has made it feasible to build electronic functions on fibers and maintain them during *** the last few years,fiber-shaped wearable electronics with desired designability and integration features have been intensively explored and *** an indispensable part and cornerstone of flexible wearable devices,fibers are of great ***,the research progress of advanced fiber materials is reviewed,which mainly includes various material preparations,fabrication technologies and representative studies on different wearable ***,key challenges and future directions of fiber materials and wearable electronics are examined along with an analysis of possible solutions.

关键词： Conductive fibers Piezoelectric fibers Sensors Artificial muscles Energy harvesting and storage

Environmental and economic assessment of structural repair technologies for spent lithium-ion battery cathode materials

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International Journal of Minerals,Metallurgy and Materials 2022年第5期29卷 942-952页

作者： Jiao Lin jiawei wu Ersha Fan Xiaodong Zhang Renjie Chen Feng wu Li Li Beijing Key Laboratory of Environmental Science and Engineering School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Guangdong Key Laboratory of Battery Safety Guangzhou Institute of Energy TestingGuangzhou 511447China Collaborative Innovation Center of Electric Vehicles in Beijing Beijing 100081China Advanced Technology Research Institute Beijing Institute of TechnologyJinan 250300China

The existing recycling and regeneration technologies have problems,such as poor regeneration effect and low added value of products for lithium(Li)-ion battery cathode materials with a low state of *** this work,a targeted Li replenishment repair technology is proposed to improve the discharge-specific capacity and cycling stability of the repaired LiCoO_(2) cathode *** with the spent cathode material with>50%Li deficiency,the Li/Co molar ratio of the regenerated LiCoO_(2) cathode is>0.9,which completely removes the Co_(3)O_(4) impurity phase formed by the decomposition of LixCoO_(2) in the failed cathode material after *** repaired LiCoO_(2) cathode mater-ials exhibit better cycling stability,lower electrochemical impedance,and faster Li^(+)diffusion than the commercial materials at both 1 and 10 ***,Li_(1.05)CoO_(2) cathodes have higher Li replenishment efficiency and cycling *** energy consumption and greenhouse gas emissions of LiCoO_(2) cathodes produced by this repair method are significantly reduced compared to those using pyrometallurgical and hydro-metallurgical recycling processes.

关键词： spent lithium-ion batteries structural repair solid-phase sintering process environmental and economic assessment

A Deep-Learning Prediction Model for Imbalanced Time Series Data Forecasting

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Big Data Mining and Analytics 2021年第4期4卷 266-278页

作者： Chenyu Hou jiawei wu Bin Cao Jing Fan College of Computer Science and Technology Zhejiang University of TechnologyHangzhou 310023China

Time series forecasting has attracted wide attention in recent ***,some time series are imbalanced and show different patterns between special and normal periods,leading to the prediction accuracy degradation of special *** this paper,we aim to develop a unified model to alleviate the imbalance and thus improving the prediction accuracy for special *** task is challenging because of two reasons:(1)the temporal dependency of series,and(2)the tradeoff between mining similar patterns and distinguishing different distributions between different *** tackle these issues,we propose a self-attention-based time-varying prediction model with a two-stage training ***,we use an encoder–decoder module with the multi-head self-attention mechanism to extract common patterns of time ***,we propose a time-varying optimization module to optimize the results of special periods and eliminate the ***,we propose reverse distance attention in place of traditional dot attention to highlight the importance of similar historical values to forecast ***,extensive experiments show that our model performs better than other baselines in terms of mean absolute error and mean absolute percentage error.

关键词： time series forecasting imbalanced data deep learning prediction model

Structural and biochemical insights into the homotypic PB1-PB1 complex between PKCζ and p62

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Science China(Life Sciences) 2014年第1期57卷 69-80页

作者： REN Jun WANG Jue WANG ZhiXin wu jiawei MOE Key Laboratory of Protein Science and Tsinghua-Peking Center for Life Sciences School of Life Sciences Tsinghua University

The atypical PKC isoforms （ζ and t） play essential roles in regulating various cellular processes. Both the hetero-interaction between PKCζand p62 through their N-terminal PB 1 domains and the homo-oligomerization of p62 via its PB 1 domain are critical for the activation of NF-r.B signaling; however, the molecular mechanisms concerning the formation and regulation of these homotypic complexes remain unclear. Here we determined the crystal structure of PKCζ-PB 1 in complex with a mono- meric p62-PB 1 mutant, where the massive electrostatic interactions between the acidic OPCA motif of PKCζ-PB 1 and the basic surface of p62-PB 1, as well as additional hydrogen bonds, ensure the formation of a stable and specific complex. The PKCζ-p62 interaction is interfered with the modification of a specific Cys of PKCζ by the antiarthritis drug aurothiomalate, though all four cysteine residues in the PKCζ-PB 1 domain can be modified in in vitro assay. In addition, detailed structural and biochemical analyses demonstrate that the PB 1 domains of aPKCs belong to the type I group, which can depolymerize the high-molecular-weight p62 aggregates into homo-oligomers of lower order. These data together unravel the molecular mecha- nisms of the homo- or hetero-interactions between p62 and PKCζ and provide the basis for designing inhibitors of NF-r,.B sig- naling.

关键词： PKC p62 PB1 domain heterodimerization and homo-oligomerization aurothiomalate

Remote sensing of spatial patterns of urban renewal using linear spectral mixture analysis： A case of central urban area of Shanghai （1997-2000）

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Chinese Science Bulletin 2006年第8期51卷 977-986页

作者： YUE Wenze XU Jianhua wu jiawei XU Lihua College of Southeast Land Management Zhejiang University Hangzhou 310029 China Department of Geography East China Normal University Shanghai 200062 China Zhejiang Forest University Lin'an 311300 China

It is very important to integrate remote sensing with urban geography that the spectral mix- ture analysis technique is applied to urban land cover evolvement and its eco-environmental effect. Urban land cover is mainly composed of complicated artifi- cial materials, which is the key factor to limit the de- velopment of the spectral mixture analysis technique. There are two main aspects in which the technique of spectral mixture analysis is applied to urban geog- raphy: one is to calculate vegetation fraction; the other is to build quantitative model of the urban im- pervious surface obtained from the combination be- tween high albedo fraction and low albedo fraction. The technique of spectral mixture analysis is firstly applied to study urban renewal pattern, scale and mode which happened in Shanghai City from 1997 to 2000.

关键词：遥感分布类型城市更新上海线性光谱分析

Phase and chemical state tuning of FeNi oxides for oxygen evolution reaction

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Science China Chemistry 2024年第8期67卷 2755-2766页

作者： jiawei wu Zhouyang Ma Lice Yu Shuli Wang Fulin Yang Ligang Feng School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225002China

Advancing and deploying the Fe Ni-based catalyst,the state-of-the-art pre-electrocatalysts,for oxygen evolution reactions(OER)still suffer from unclear chemical state correlation to the catalytic ability,as evidenced by the variedly reported performance for the different Fe Ni ***,we contributed the phase and redox chemical states tuning of Fe Ni oxides by the surface microenvironment regulation for the OER catalysis that was realized by the urea-assisted pyrolysis and molybdenum-doping technique by integrating molybdenum into the iron–nickel metal-organic *** by the complicated and compromised atmosphere,namely,the oxidation state driven by the Mo doping and reduction ability induced by the urea-assisted pyrolysis,could transfer confined Fe Ni oxides to hybrid phases of Fe_(2)O_(3)and FeNi_(3)alloy,and the resultant compromised chemical states by the charge redistribution imparted very high electrocatalytic performance for OER compared with the control *** insitu Raman spectroscopy and post-XPS analysis confirmed the facile Fe/Ni oxyhydroxide active phase formation resulting from the proper phase and chemical states,and theoretical analysis disclosed the microenvironment regulation resulting in the charge redistribution forming the electron accumulation and depletion sites to accelerate the oxygen-species to oxyhydroxide-species transformation and enhance the electronic state density near the Fermi level by significantly reducing the energy *** work not only showed the importance of surface chemical state tunning that can basically answer the varied performance of Fe Ni catalysts but also revealed an effective approach for fine-tuning their catalytic properties.

关键词： oxygen evolution reaction FeNi-based catalysts urea pyrolysis chemical states charge redistribution