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Group-based joint signaling and data resource allocation in MTC-underlaid cellular networks

Science China(Information Sciences) 2017年第10期60卷 55-67页

作者： Xuefei ZHANG yue WANG Ruiqi WANG Yanzhao hou Da WANG School of Information and Communication Engineering Beijing University of Posts and Telecommunications China Telecom Corporation Limited Technology Innovation Center

Machine-type communications(MTC) are gaining significant research attention as one of the most promising technologies for the fifth generation(5G) mobile networks. A critical issue handled by MTC is support for massive numbers of connections, which is a growing problem that will become increasingly challenging as MTC share spectrum resources with cellular communication. Here, not only the number of connections but also the data rate requirements of cellular users(CUEs) need to be considered. Given these issues, in this paper, we formulate a group-based joint signaling and data resource optimization model constrained by network resource and data rate requirements in order to maximize the number of connections. We also note that this problem is nonconvex and that obtaining an optimal solution is computationally complex for MTC with massive numbers of users(UEs). Therefore, we decompose the problem into group-based data aggregation and resource allocation subproblems. To solve these two subproblems, we develop an adaptive group head selection algorithm and a joint signaling and data resource allocation algorithm that satisfy both the data rate requirement and resource constraints, respectively. Our simulation results show that our proposed algorithms significantly improve the number of connections when compared with other classic methods. Furthermore, our results reveal that the limiting factor on the number of connections changes with the ratio of the number of MTC UEs to that of CUEs and the ratio of data requirement of MTC UEs to that of CUEs. Finally, we note that our proposed group-based resource allocation algorithm can effectively improve the number of connections, especially when more MTC UEs and a small amount of MTC data are present.

关键词： data aggregation matrix analysis machine-type communications signaling and data resource allocation

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Can executive mobility reduce the stock price crash risk?Evidence from China

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Economic and Political Studies 2023年第4期11卷 529-540页

作者： Jing Zhang shuang yue shuang Zi School of Finance Shandong University of Finance and EconomicsJi’nanChina

The 21st century has witnessed increasing fluctuations in boththe real economy and financial markets around the world. Howto maintain the stability of the capital market has attracted moreserious attention. This paper examines the impact of executivemobility on the stock price crash risk at the company level. Basedon the data of A-share listed companies during 2010–2019, ourempirical results show that executive mobility can effectivelyreduce the stock price crash risk. Furthermore, our research confirms that employee salaries play an intermediary role in theimpact of executive mobility on the stock price crash risk. Thispaper has important implications for companies in emerging markets to optimise the structure of their executive teams.

关键词： Executive mobility stock price crash risk employee salaries

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Influences of Cooling Rate After Solution Treatment on Microstructural Evolution and Mechanical Properties of Superalloy Rene 80

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Acta Metallurgica Sinica(English Letters) 2017年第3期30卷 261-271页

作者： shuang Gao Jie-Shan hou Kai-Xin Dong Lan-Zhang Zhou Institute of Metal Research Chinese Academy of SciencesShenyang 110016 China

Influences of the cooling rate after solution treatment on microstructural evolution and mechanical properties of Rene 80 nickel-based superalloy were investigated by optical microscopy, scanning electron microscopy, transmission electron microscopy and mechanical test. Results showed that the high cooling rate decreased the size of secondary γ＇particles in the supersaturated matrix, but led to a high coarsening rate of γ＇ particles during subsequent aging treatment. Despite various coarsening rates, the size and morphology of γ＇ particles in the final microstructures of all samples were close due to the long enough holding time to an equilibrium state. During the aging of 870 ℃/2 h, primary MC started to decompose with the carbide reaction： MC ＋ γ＇ --＊ MrC or M23C6 -t- γ＇. And a number of observations showed that the coarsening of γ＇ particles on grain boundaries resulted in the depletion of γ＇ during aging treatment. The test results indicated that high cooling rate resulted in the presence of quench crack, and the air cooling method following solution treatment was an optimum heat treatment method for Rene 80.

关键词： Ni-based superalloy Cooling rate Precipitates Ripening theory Heat treatment Microstructural evolution

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Understandings of Urban Sustainability in China:a Bibliometric Analysis Using Chinese Literatures

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Journal of Geodesy and Geoinformation Science 2024年第1期7卷 105-122页

作者： WU shuang yue Yang LI Xuesong Department of Urban Informatics School of Architecture and Urban PlanningShenzhen UniversityShenzhen 518060China Shenzhen Key Laboratory of Spatial Smart Sensing and Services Guangdong Key Laboratory for Urban InformaticsShenzhen UniversityShenzhen 518060China.

Cities hold a critical responsibility for achieving the Sustainable Development Goals(SDGs)due to their high population density,extensive resource consumption,and significant economic *** examine the present state of understandings regarding urban sustainability(SDG 11:Sustainable Cities and Communities)within Chinese research communities,this study collected 15950 papers from 1994 to 2022 on the 12 indicators of SDG 11,from the China National Knowledge Infrastructure(CNKI),a hub of Chinese academic papers,that directly relate to *** research topics on SDG 11 were identified for each indicator using bibliometrics analysis *** high-frequency keywords and clusters of keywords over the last three decades reveal that existing studies primarily concentrated on the physical aspects,such as transportation and environment,while there is a lack of consideration of societal *** indicates a limited and biased understanding of the urban sustainability within the Chinese academic ***,it is crucial to prioritize the societal aspects in order to develop a research agenda that further advances urban sustainability.

关键词： urban sustainability SDG 11 bibliometric Chinese research communities

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Constitutive modelling of fabric effect on sand liquefaction

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第4期15卷 926-936页

作者： Zhiwei Gao Dechun Lu yue hou Xin Li James Watt School of Engineering University of GlasgowGlasgowG128QQUK Institute of Geotechnical and Underground Engineering Beijing University of TechnologyBeijing100124China Beijing Key Laboratory of Traffic Engineering Beijing University of TechnologyBeijingChina

Sand liquefaction under static and dynamic loading can cause failure of embankments,slopes,bridges and other important *** liquefaction in the seabed can also cause submarine landslides and *** anisotropy related to the internal soil structure such as particle orientation,force network and void space is found to have profound influence on sand liquefaction.A constitutive model accounting for the effect of anisotropy on sand liquefaction is *** of fabric anisotropy during loading is considered according to the anisotropic critical state theory for *** model has been validated by extensive test results on Toyoura sand with different initial densities and stress *** effect of sample preparation method on sand liquefaction is qualitatively *** model has been used to investigate the response of a sand ground under earthquake *** is shown that sand with horizontal bedding plane has the highest resistance to liquefaction when the sand deposit is anisotropic,which is consistent with the centrifuge test *** initial degree of fabric anisotropy has a more significant influence on the liquefaction *** with more anisotropic fabric that can be caused by previous loading history or compaction methods has lower liquefaction resistance.

关键词： Sand Anisotropy Liquefaction Finite element modelling Constitutive model

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Sedimentary features and sequence stratigraphy of the successions around the Carboniferous-Permian boundary in the Ordos Basin:links to glacial and volcanic impacts

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Journal of Palaeogeography 2023年第3期12卷 358-383页

作者： Zhong-Shuai hou Shi-yue Chen Zhao Liang Hebei Key Laboratory of Strategic Critical Mineral Resources Hebei GEO UniversityShijiazhuang 050031China Interdisciplinary Science Research Institute Hebei GEO UniversityShijiazhuang 050031China School of Geosciences China University of PetroleumQingdao 266580China

The sedimentary successions around the Carboniferous-Permian boundary(CPB)in the Ordos Basin were investigated using extensive outcrop,borehole,well logging,thin section,and geochemistry data to study sedimentary and sequence stratigraphic responses to glaciation and volcanism in paleotropical transitional *** the studied interval,five distinct lithofacies have been identified,including bauxite,coal,and carbonaceous shale(No.8+9 coal seams),sandstone(Qiaotou),limestone(Baode),and mudstone,which can be classified into three lithofacies *** most complete lithofacies associ-ation is composed of bauxite,coal,carbonaceous shale,sandstone,limestone/mudstone or their combinations from the bottom to the top,while coal and carbonaceous shale,as well as sandstone,are absent locally,resulting in the formation of the other two types of lithofacies *** occurrence of bauxite in-dicates shelf exposure and weathering,the occurrence of coal and carbonaceous shale indicates swampiness of the shelf,and the occurrence of sandstone reveals river rejuvenation;all of these are thought to be sedimentary responses to the transcontinental glacier expansion in Gondwana around the *** presence of limestone and mudstone indicates carbonate platform and lagoon deposition,respectively,in the context of the earliest Asselian transgression caused by volcanism-induced glacier *** lithofacies associations record the regressive-transgressive cycles that occurred because of glaciation and volcanism near the *** top surface of bauxite can be used as a sequence boundary,while the lowstand systems tract consists of the No.8+9 coal seams and the Qiaotou sandstone,and the transgressive systems tract consists of the overlying Baode limestone and laterally equivalent *** lowstand systems tract,which contains source rock and hydrocarbon reservoirs,and the overlying transgressive systems tract,which serves as cap rock,form an excellent source-reservoi

关键词： Glaciation Volcanism Incised valley Sequence stratigraphy Ordos basin

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How to effectively manage the refractory coronary thrombus? A systemic mini-review

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Journal of Geriatric Cardiology 2023年第4期20卷 309-313页

作者： Song ZHANG Dang-Hui SUN shuang LI yue LI Department of Cardiology the First Affiliated Hospital of Harbin Medical UniversityHarbinChina NHC Key Laboratory of Cell Translation Harbin Medical UniversityHarbinChina Key Laboratory of Hepatosplenic Surgery Harbin Medical UniversityMinistry of EducationHarbinChina Key Laboratory of Cardiac Diseases and Heart Failure Harbin Medical UniversityHarbinChina Heilongjiang Key Laboratory for Metabolic Disorder&Cancer Related Cardiovascular Diseases HarbinChina

The main management principle for patients with coronary thrombus should be “more removal and less implantation”.Routine thrombus aspiration(TA) is ineffective for intracoronary thrombus or high residual thrombus burden after TA and may result in a refractory coronary *** is unwise to implant a stent in the vessel with high residual thrombus,which is associated with no-reflow,impaired microvascular perfusion,and consequently worse clinical ***,increasing the efficiency of TA during percutaneous coronary intervention procedures,especially under some conditions of refractory coronary thrombus,is very important to restore myocardial reperfusion and improve microvascular dysfunction *** the present work,we aimed to demonstrate the factors that may affect TA efficiency and introduce several highly effective approaches to treat refractory coronary thrombus.

关键词： thrombus coronary impaired

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PVP-assisted preparation of nitrogen doped mesoporous carbon materials for supercapacitors

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Journal of Materials Science & Technology 2020年第23期58卷 197-204页

作者： Juan Du Aibing Chen yue Zhang shuang Zong Haixia Wu Lei Liu College of Chemical and Pharmaceutical Engineering Hebei University of Science and TechnologyShijiazhuang050018China International Joint Laboratory of New Energy Hebei University of Science and TechnologyShijiazhuang050018China Institute for the Development of Energy for African Sustainability University of South Africaprivate bag X6 Florida 1710South Africa

The rich porous structure,high surface area and surface doping make nitrogen doping mesoporous carbon materials(N-MPC)attractive in various areas,including adsorption separation,electrochemical energy storage,catalysis and other ***,polyvinylpyrrolidone(PVP)is introduced into the polymerization process of assembly of phenol/formaldehyde(PF)resin by means of hydrogen bonds and electrostatic interaction,which not only leads to the formation of uniform mesopores,but also leads to the increase of specific surface area and nitrogen *** amount of PVP and annealing temperature has no obvious effect on morphology,but subsequently has effect on the specific surface area and pore *** appropriate PVP dosage and annealing temperature are adopted,the obtained N-MPC shows abundant mesoporous,high surface area and suitable nitrogen *** electrode materials in supercapacitor,the N-MPC shows good performance with high capacitance good stability and rate performance,presenting its excellent promising in energy storage.

关键词： PVP-assisted High specific surface area Nitrogen doping Phenol/formaldehyde resin Supercapacitor

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Microneedle patch loaded with ferritin-nanocaged doxorubicin for locally targeted drug delivery and efficient skin cancer treatment

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Particuology 2024年第5期88卷 282-289页

作者： Feng Li Yuan Yang Hua yue shuang Wang Xiao Zhang Wei Wei State Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing100190China Key Laboratory of Biopharmaceutical Preparation and Delivery Chinese Academy of SciencesBeijing100190China School of Chemical Engineering University of Chinese Academy of SciencesBeijing100049China

Ferritin has emerged as a promising nanocarrier for delivering therapeutic agents to ***,the limited drug loading and the off-target impacts after systemic administration remain challenges for cancer treatment with ferritin-based ***,we develop a microneedle patch loaded with ferritin-nanocaged doxorubicin(DoxFe@Fn/MN)for skin cancer ***,doxorubicin(Dox)is encapsulated in ferritin(Fn)using an iron core-assisted strategy,which results in a 3.4-fold increase in Dox loading compared to the direct loading ***,a polyvinyl alcohol-based microneedle(MN)patch is used for the transdermal delivery of DoxFe@Fn,enabling targeted tumour accumulation of DoxFe@Fn and preventing off-target *** released DoxFe@Fn can bind to CD71 highly expressed on skin cancer cells,facilitating its *** a result,the DoxFe@Fn/MN therapy presents a robust antitumour effect in a melanoma tumour model,showing its potential as a promising therapeutic modality for skin cancer treatment.

关键词： Ferritin Microneedle Skin cancer Drug delivery

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The accelerating nanoscale Kirkendall effect in Co films–native oxide Si(100)system induced by high magnetic fields

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Journal of Materials Science & Technology 2020年第11期42卷 127-135页

作者： yue Zhao Kai Wang shuang Yuan Yonghui Ma Guojian Li Qiang Wang Institute of Microscale Optoelectronics Shenzhen UniversityShenzhen 578060China Key Laboratory of Electromagnetic Processing of Materials(Ministry of Education) Northeastern UniversityShenyang 110819China Department of New Energy Science and Engineering School of MetallurgyNortheastern UniversityShenyang 110819China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China

The morphology evolution and magnetic properties of Co films–native oxide Si(100)were investigated at 873,973,and 1073 K in a high magnetic field of 11.5 *** of Kirkendall voids in the Co films was found to cause morphology evolution due to the difference in diffusion flux of Co and Si atoms through the native oxide *** high magnetic fields had considerable effect on the morphology evolution by accelerating nanoscale Kirkendall *** diffusion mechanism in the presence of high magnetic fields was given to explain the increase of diffusion *** morphology evolution of Co films on native oxide Si(100)under high magnetic fields during annealing resulted in the magnetic properties variation.

关键词： Thin films Annealing Diffusion Kirkendall effect High magnetic field

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