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Data Collection Capacity of Random-Deployed Wireless Sensor Networks under Physical Models

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Tsinghua Science and Technology 2012年第5期17卷 487-498页

作者： siyuan Chen Yu wang Department of Computer Science University of North Carolina at Charlotte Charlotte NC 28223 USA

Data collection is one of the most important functions provided by wireless sensor networks. In this paper, we study the theoretical limitations of data collection in terms of capacity for a wireless sensor network where n sensors are randomly deployed. We first consider data collection under physical model We show that the capacity of data collection is in order of ⊙（W） where W is the fixed data-rate on individual links. Particularly, we give a simple collection method based on interference blocks and theoretically prove that the method can achieve the optimal capacity in order. If each sensor can aggregate its receiving packets into a single packet to send, the capacity of data collection increases to ⊙（ n/log n W ）. We then derive a lower bound and an upper bound of data collection capacity under generalized physical model where the data rate depends on the signal to interference plus noise ratio.

关键词： data collection capacity physical model wireless sensor networks

Stochastic Flexibility Evaluation for Virtual Power Plants by Aggregating Distributed Energy Resources

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CSEE Journal of Power and Energy Systems 2024年第3期10卷 988-999页

作者： siyuan wang Wenchuan Wu Qizhan Chen Junjie Yu Peng wang Department of Electrical Engineering Tsinghua UniversityBeijing 100084China Zhongshan Power Supply Bureau of the Guangdong Power Grid Corporation Zhongshan 528400China Beijing Qingda Gaoke System Control Company Beijing 102208China CSEE IEEE

To manage a large amount of flexible distributed energy resources(DERs)in the distribution networks,the virtual power plant(VPP)is introduced into the *** VPP can optimally dispatch these resources in a cluster manner and provide flexibility for the power system operation as a *** existing studies formulate the equivalent power flexibility of the aggregating DERs as deterministic optimization models without considering their *** this paper,we introduce the stochastic power flexibility range(PFR)and timecoupling flexibility(TCF)to describe the power flexibility of *** this model,both operational constraints and the randomness of the DERs’output are incorporated,and a combined model and data-driven solution is proposed to obtain the stochastic PFR,TCF,and cost function of *** aggregating model can be easily incorporated into the optimization model for the power system operator or market bidding,considering ***,a numerical test is *** results show that the proposed model not only has higher computational efficiency than the scenario-based methods but also achieves more economic benefits.

关键词： Chance constrained optimization combined model and data-driven stochastic power flexibility virtual power plant

STABC-IR:An air target intention recognition method based on bidirectional gated recurrent unit and conditional random field with space-time attention mechanism

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Chinese Journal of Aeronautics 2023年第3期36卷 316-334页

作者： siyuan wang Gang wang Qiang FU Yafei SONG Jiayi LIU Sheng HE Air Defense and Antimissile School Air Force Engineering UniversityXi’an 710051China

The battlefield environment is changing rapidly,and fast and accurate identification of the tactical intention of enemy targets is an important condition for gaining a decision-making *** current Intention Recognition(IR)method for air targets has shortcomings in temporality,interpretability and back-and-forth dependency of *** address these problems,this paper designs a novel air target intention recognition method named STABC-IR,which is based on Bidirectional Gated Recurrent Unit(Bi GRU)and Conditional Random Field(CRF)with Space-Time Attention mechanism(STA).First,the problem of intention recognition of air targets is described and analyzed in ***,a temporal network based on Bi GRU is constructed to achieve the temporal ***,STA is proposed to focus on the key parts of the features and timing information to meet certain interpretability requirements while strengthening the timing ***,an intention transformation network based on CRF is proposed to solve the back-and-forth dependency and transformation problem by jointly modeling the tactical intention of the target at each *** experimental results show that the recognition accuracy of the jointly trained STABC-IR model can reach 95.7%,which is higher than other latest intention recognition ***-IR solves the problem of intention transformation for the first time and considers both temporality and interpretability,which is important for improving the tactical intention recognition capability and has reference value for the construction of command and control auxiliary decision-making system.

关键词： Bidirectional gated recurrent network Conditional random field Intention recognition Intention transformation Situation cognition Space-time attention mechanism

Iron-Catalyzed Aminomethyloxygenative Cyclization of Hydroxy-α-diazoesters with N,O-Aminals

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Chinese Journal of Chemistry 2020年第4期38卷 389-393页

作者： Suchen Zou Tianze Zhang siyuan wang Hanmin Huang Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry Center for Excellence in Molecular SynthesisUniversity of Science and Technology of ChinaChinese Academy of SciencesHefeiAnhui 230026China State Key Laboratory of Applied Organic Chemistry Lanzhou UniversityLanzhouGonsu 730000China

Summary of main observation and conclusion A new and eficient cyclization reaction has bleen developed to synthesize cyclic a,a-disubstituted B-amino esters via iron-catalyzed intramolecular aminomethyloxygenative cyclization of diazo compounds with N,O-aminal under mild reaction condi-tions.A broad range of hydroxy-a diazoesters with different substituents and various N,O-aminals were compatible with this protocol,affording the corresponding a,a-disubstitutedβ-amino esters bearing a five-to eight-membered oxacycle in good yields.

关键词： esters substituted cyclization

Optimal rejection of bounded perturbations in linear leader-following consensus protocol: invariant ellipsoid method

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Science China(Information Sciences) 2024年第8期67卷 24-34页

作者： siyuan wang Andrey POLYAKOV Min LI Gang ZHENG Driss BOUTAT INSA Centre Val de Loire INRIA

The objective of the invariant ellipsoid method is to minimize the smallest invariant and attractive set of a linear control system operating under the influence of bounded external disturbances. This study extends the application of this method to address the leader-following consensus problem. Initially, a linear control protocol is designed for the multi-agent system in the absence of disturbances. Subsequently, in the presence of bounded disturbances, by employing a similar linear control protocol, a necessary and sufficient condition is introduced to derive the optimal control parameters for the multi-agent system such that the state of followers converges to and remains in a minimal invariant ellipsoid around the state of the leader.

关键词： multi-agent system leader-following consensus invariant ellipsoid disturbance

Non-bonding modulations between single atomic cerium and monodispersed selenium sites towards efficient oxygen reduction

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Nano Research 2024年第6期17卷 4753-4763页

作者： Leilei Yin Shuai Zhang Mingzi Sun siyuan wang Bolong Huang Yaping Du Tianjin Key Lab for Rare Earth Materials and Applications Center for Rare Earth and Inorganic Functional MaterialsHaihe Laboratory of Sustainable Chemical TransformationsSmart Sensing Interdisciplinary Science CenterSchool of Materials Science and EngineeringNational Institute for Advanced MaterialsNankai UniversityTianjin 300350China Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic UniversityHung HomKowloon 999077Hong KongChina Research Centre for Carbon-Strategic Catalysis The Hong Kong Polytechnic UniversityHung HomKowloon 999077Hong KongChina

Currently,dual atomic catalysts(DACs)with neighboring active sites for oxygen reduction reaction(ORR)still meet lots of challenges in the synthesis,especially the construction of atomic pairs of elements from different blocks of the periodic ***,a“rare earth(Ce)-metalloid(Se)”non-bonding heteronuclear diatomic electrocatalyst has been constructed for ORR by rational coordination and carbon support defect ***,the optimized Ce-Se diatomic catalysts(Ce-Se DAs/NC)displayed a half-wave potential of 0.886 V *** hydrogen electrode(RHE)and excellent stability,which surpass those of separate Ce or Se single atoms and most single/dual atomic catalysts ever *** addition,a primary zinc-air battery constructed using Ce-Se DAs/NC delivers a higher peak power density(209.2 mW·cm^(−2))and specific capacity(786.4 mAh·gZn^(−1))than state-of-the-art noble metal catalysts Pt/*** calculations reveal that the Ce-Se DAs/NC has improved the electroactivity of the Ce-N_(4)region due to the electron transfer towards the nearby Se specific activity(SA)***,the more electron-rich Se sites promote the adsorptions of key intermediates,which results in the optimal performances of ORR on Ce-Se DAs/*** work provides new perspectives on electronic structure modulations via non-bonded long-range coordination micro-environment engineering in DACs for efficient electrocatalysis.

关键词： catalyst rare earth oxygen reduction reaction(ORR) metalloid non-bonding modulation

响应面法优化蚕蛹发酵工艺及其产物呈味特性研究

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食品工业科技 2025年第1期46卷 231-238页

作者：覃芳丽王思远邹宇晓黎尔纳穆利霞李庆荣广东省农业科学院蚕业与农产品加工研究所/广东省农产品加工重点实验室/农业农村部功能食品重点实验室广东广州510610 仲恺农业工程学院轻工食品学院广东广州510225

为优化建立蚕蛹发酵工艺,探索其发酵产物呈味特性,本文研究了不同菌种、接种量、发酵温度、发酵时间对蚕蛹发酵产氨基酸态氮含量的影响,在单因素实验的基础上,采用响应面法对蚕蛹发酵工艺进行优化,并对比分析发酵前后呈味物质与滋味的... 详细信息

为优化建立蚕蛹发酵工艺,探索其发酵产物呈味特性,本文研究了不同菌种、接种量、发酵温度、发酵时间对蚕蛹发酵产氨基酸态氮含量的影响,在单因素实验的基础上,采用响应面法对蚕蛹发酵工艺进行优化,并对比分析发酵前后呈味物质与滋味的变化。结果表明:清酒乳杆菌接种量1.0%、发酵温度32℃、发酵时间10 d是最佳发酵工艺,此时氨基酸态氮含量达0.95±0.02 g/100 g,与预测值相近。与未发酵蚕蛹相比,发酵蚕蛹的游离氨基酸、核苷酸和有机酸含量均显著升高(P<0.05),分别为52.19±0.11、1.01±0.03、65.54±1.61 mg/g。呈鲜味的天冬氨酸、谷氨酸、鸟苷酸、腺苷酸和琥珀酸的TAV值均大于1,特别是谷氨酸和琥珀酸,TAV值高达20.06、138.47,是发酵蚕蛹中鲜味的重要贡献者;蚕蛹发酵后的味精当量达74.44 g MSG/100 g,是发酵前的6.74倍。本研究表明,蚕蛹发酵可产鲜味物质,且风味良好,为蚕蛹的开发利用和鲜味物质的制备提供了新的思路。

关键词：蚕蛹发酵工艺优化呈味物质鲜味

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Characteristic of homodrimane and maturity of organic matter in the low mature source rocks

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Chinese Journal Of Geochemistry 2012年第2期31卷 187-190页

作者： BING Pingping CAO siyuan LU Jiaotong wang Zongjun CNPC Key Laboratory of Geophysics China University of Petroleum Beijing 102249 China

Bicyclic sesquiterpenoids are mostly used to illustrate the origins of organic matter and genetic types of crude oil *** this paper,the relationship between distributions and compositions of C16 homodrimane in immature to mature source rocks and evolution of organic matter was studied,and the correlation between C16 homodrimane at immature to low mature stages and thermal evolution of organic matter was *** results show that in terrestrial facies depositional system,the ratio of 8α(H)-homodrimane to 8β(H)-homodrimane has a high sensitivity about the maturity’s minor changes at immature to low mature *** is found that when the vitrinite reflectance R0<0.7%,the ratio significantly decreases with increasing burial depth or *** kind of phenomenon reveals that these parameters may be the useful maturity indicators for determining the relative maturation of organic matter at immature to low mature stages,and have certain practical value in biogeochemical and en- vironmental geochemical research on low mature oil and gas.

关键词：有机质成熟度低成熟石油烃源岩成熟阶段有机质热演化镜质体反射率地球化学有机质演化

Spatiotemporal patterns of snow cover retrieved from NOAA-AVHRR LTDR: a case study in the Tibetan Plateau, China

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International Journal of Digital Earth 2017年第5期10卷 504-521页

作者： siyuan wang Hang Yin Qichun Yang Hui Yin Xiaoyue wang Yaoyao Peng Ming Shen Key Laboratory of Digital Earth Science Institute of Remote Sensing and Digital EarthChinese Academy of ScienceBeijingPeople’s Republic of China Pacific Northwest National Laboratory RichlandWAUSA

Snow cover plays an important role in hydrological processes and seasonal water *** in the Tibetan Plateau(TP),snow cover is an important source of the Yangtze River,Yellow River and Lancang River(SRYYL),which greatly influences regional water *** this study,we quantified the temporal trend and spatial variation of snow cover across the TP by calibrating and developing the Advance Very High Resolution Radiometer(AVHRR)Long Term Data Record(LTDR)-derived snow cover products during *** also examined the relationship of snow cover with temperature and precipitation over the TP during 1982–*** results indicate that seasonal snow cover generally starts to accumulate from central plateau in October,while significant melting starts to occur from the southeastern plateau in May of following *** long-term variability of snow cover is characterized by the tendency for a slight decrease in the mean snow coverage during the period of hydrological year(HY)1982–1993 and a slight increase from HY2001 to 2011,but the total snow cover area remains relatively stable over the past 30 *** results also show that temperature plays a critical role in controlling the snow cover days.

关键词： Snow cover temporal-spatial variation NOAA-AVHRR LTDR Tibetan Plateau