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Joint computation offloading and resource allocation in vehicular edge computing networks

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Digital Communications and Networks 2023年第6期9卷 1399-1410页

作者： Shuang liu Jie Tian Chao Zhai tiantian li School of Information Science and Engineering Shandong Normal UniversityJinan250358China School of Information Science and Engineering Shandong UniversityQingdao266237China

Vehicular Edge Computing(VEC)is a promising technique to accommodate the computation-intensive and delaysensitive tasks through offloading the tasks to the RoadSide-Unit(RSU)equipped with edge computing servers or neighboring ***,the limited computation resources of edge computing servers and the mobility of vehicles make the offloading policy design very *** this context,through considering the potential transmission gains brought by the mobility of vehicles,we propose an efficient computation offloading and resource allocation scheme in VEC networks with two kinds of offloading modes,i.e.,Vehicle to Vehicle(V2V)and Vehicle to RSU(V2R).We define a new cost function for vehicular users by incorporating the vehicles’offloading delay,energy consumption,and expenses with a differentiated pricing strategy,as well as the transmission *** optimization problem is formulated to minimize the average cost of all the task vehicles under the latency and computation capacity constraints.A distributed iterative algorithm is proposed by decoupling the problem into two subproblems for the offloading mode selection and the resource *** theorybased and Lagrangian-based algorithms are proposed to solve the two subproblems,*** results show the proposed algorithm achieves low complexity and significantly improves the system performance compared with three benchmark schemes.

关键词： Vehicular edge computing Task offloading Matching theory Lagrangian method Distributed algorithm

Increment-Dimensional Scaled Boundary Finite Element Method for Solving Transient Heat Conduction Problem

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Transactions of Nanjing University of Aeronautics and Astronautics 2018年第6期35卷 1073-1079页

作者： li Fengzhi li tiantian Kong Wei Cai Junfeng College of Aerospace Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016P.R.China College of Aeronautic Science and Engineering Beihang UniversityBeijing 100191P.R.China The 610 Research Institute of Chinese Aeronautical Establishment Xiangyang 441000P.R.China

An increment-dimensional scaled boundary finite element method (ID-SBFEM) is developed to solve the transient temperature *** improve the accuracy of SBFEM,the effect of high frequency factor on dynamic stiffness is considered,and the first-order continued fraction technique is *** the derivation,the SBFE equations are obtained,and the dimensions of thermal conduction,the thermal capacity matrix and the vector of the right side term in the equations are *** example is presented to illustrate the feasibility and good accuracy of the proposed method.

关键词： heat conduction scaled boundary finite element method(SBFEM) temperature field accuracy

One and Two-Weight Z2R2 Additive Codes

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Chinese Journal of Electronics 2021年第1期30卷 72-76页

作者： li tiantian SHI Minjia liN Bo WU Wenting School of Mathematical Sciences Anhui University School of Wendian Anhui University

This paper is devoted to the construction of one and two-weight Z2R2additive codes, where R2=F2[v]/(v~4). It is a generalization towards another direction of Z2Z4codes(S.T. Dougherty, H.W. liu and L. Yu,"One weight Z2Z4additive codes", Applicable Algebra in Engineering, Communication and Computing, Vol.27,No.2, pp.123–138, 2016). A Mac Williams identity which connects the weight enumerator of an additive code over Z2R2and its dual is established. Several construction methods of one-weight and two-weight additive codes over Z2R2are presented. Several examples are presented to illustrate our main results and some open problems are also proposed.

关键词： dual codes additive code weight enumerator two-weight additive codes

Enhanced dewaterability of waste activated sludge by UV assisted ZVI-PDS oxidation

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Journal of Environmental Sciences 2022年第3期34卷 152-164页

作者： Yanping Zhang tiantian li Jiayu Tian Huichun Zhang Fen li Jiahua Pei School of Civil Engineering and Transportation Hebei University of TechnologyTianjin 300401China Department of Civil and Environmental Engineering Case Western Reserve UniversityClevelandOH 44106USA College of Chemical and Environmental Engineering Harbin University of Science and TechnologyHarbin 150000China

Ultraviolet(UV)assisted zero-valent iron(ZVI)-activated sodium persulfate(PDS)oxidation(UV-ZVI-PDS)was used to treat waste activated sludge(WAS)in this *** dewaterability performance and mechanism of WAS dewatering were *** results showed that UV-ZVI-PDS can obtain better sludge dewatering performance in a wide pH range(2.0-8.0).When the molar ratio of ZVI/PDS was 0.6,UV was 254nm,PDS dosage was 200 mg/g TS(total solid),pH was 6.54,reaction time was 20 min,the CST(capillary suction time)and SRF(specific resistance to filtration)were decreased by 64.0%and 78.2%,*** molar ratio of ZVI/PDS used in this paper is much lower than that of literatures,and the contents of total Fe and Fe^(2+) in sludge supernatant remained at a low level,as 3.7 mg/L and 0.0 mg/*** analysis of extracellular polymeric substances(EPS),scanning electron microscope(SEM)and particle size distribution showed that the EPS could be effectively destroyed by UV-ZVI-PDS,the sludge flocs broken down into smaller particles,cracks and holes appeared,and then the bound water was *** the same time,the highly hydrophilic tightly bound-EPS(TB-EPS)were converted into loosely bound EPS(LB-EPS)and soluble EPS(S-EPS).During sludge pretreated by UV-ZVI-PDS,positively charged ions,such as Fe^(2+),Fe^(3+) and H^(+),produced in the reaction system could reduce the electronegativity of sludge surface,promote sludge particles aggregation,and then enhanced the sludge dewaterability.

关键词： Sludge dewatering Persulfate Zero-valent iron UV Extracellular polymeric substances

The Impact of Irrigation on Bacterial Community Composition and Diversity in liaohe Estuary Wetland

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Journal of Ocean University of China 2018年第4期17卷 855-863页

作者： li tiantian HU Hong li Zhengyan ZHANG Jianye li Dong College of Environmental Science and Engineering Ocean University of ChinaQingdao 266100China Colleget of Marine life Sciences Ocean University of ChinaQingdao 26610Q China Institute of Wetland Science Panjin 124000China

In this study, the sequencing of 16S ribosomal DNA was used to characterize the soil bacterial community composition and diversity in liaohe estuarine wetland. Soil samples were taken from different locations in the wetland dominated by reed. Moreover, the soil quality parameters were evaluated(p H, moisture, organic matter, total nitrogen, available nitrogen, total phosphorus, available phosphorus). The results showed that the organic matter and nutrient contents were significantly higher in irrigated wetland than those in natural wetland. Major phylogenic groups of bacteria in soil samples including Proteobacteria, Acidobacteria, Gemmatimonadetes, Actinobacteria and Cyanobacteria were analyzed and we found that Proteobacteria was the most abundant in the community, and the phylum Acidobacteria was more abundant in irrigated wetland. Beta diversity analyses indicated that the soil bacterial community was mainly affected by sampling sites rather than seasons. In general, the bacterial community in natural wetland was not significantly different with that in artificial irrigated wetland. Artificial hydraulic engineering irrigated according to the water requirement rule of reed, increased the production of reeds, changed the way of wetland soil material input, but the diversity of bacterial community kept stable relatively.

关键词： soil bacterial community liaohe estuary wetland 16S rDNA sequencing nutrient

Cytokine storm and translating IL-6 biology into effective treatments for CoVID-19

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Frontiers of Medicine 2023年第6期17卷 1080-1095页

作者： tiantian li Dongsheng Wang Haiming Wei Xiaoling Xu Department of Geriatric Medicine The First Affiliated Hospital of USTCDivision of Life Sciences and MedicineUniversity of Science and Technology of ChinaHefei 230001China Respiratory and Critical Care Medicine The First Afiliated Hospital of USTCDivision of Life Sciences and MedicineUniversity of Science and Technology of ChinaHefei 230001China Institute of Immunology and the CAS Key Laboratory of Innate Immunity and Chronic Disease School of Life Science and Medical CenterUniversity of Science and Technology of ChinaHefei 230001China Hefei National Laboratory for Physical Sciences at Microscale University of Science and Technology of ChinaHefei 230001China

As of May 3,2023,the Coronavirus disease 2019(COVID-19)pandemic has resulted in more than 760 million confirmed cases and over 6.9 million *** patients have developed pneumonia,which can deteriorate into acute respiratory distress *** primary etiology may be attributed to cytokine storm,which is triggered by the excessive release of proinflammatory cytokines and subsequently leads to immune *** that high levels of interleukin-6(IL-6)have been detected in several highly pathogenic coronavirus-infected diseases,such as severe acute respiratory syndrome in 2002,the Middle East respiratory syndrome in 2012,and COVID-19,the IL-6 pathway has emerged as a key in the pathogenesis of this hyperinflammatory ***,we review the history of cytokine storm and the process of targeting IL-6 signaling to elucidate the pivotal role played by tocilizumab in combating COVID-19.

关键词： SARS-CoV-2 COVID-19 cytokine storm interleukin-6 tocilizumab

Max-Min Fair RIS-Aided Rate-Splitting Multiple Access for Multigroup Multicast Communications

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China Communications 2023年第1期20卷 184-198页

作者： tiantian li Haixia Zhang Shuaishuai Guo Dongfeng Yuan School of Information Science and Engineering Shandong Normal UniversityJinan 250014China School of Control Science and Engineering Shandong UniversityJinan 250061China Shandong Key Laboratory of Wireless Communication Technologies (Shandong University)Jinan 250061China

Rate-splitting multiple access(RSMA)can cope with a wide range of propagation conditions in multigroup multicast communications through rate splitting *** breakthrough the grouprate limited bottleneck,reconfigurable intelligent surface(RIS)technique can be introduced to assist wireless communications through enhancing the channel *** RIS-aided RSMA multigroup multicasting,how to provide fair and high-quality multiuser service under power and spectrum constraints is *** this paper,we propose a max-min fair RIS-aided rate-splitting multiple access(MMF-RISRSMA)scheme for multigroup multicast communications,where the rate fairness is obtained by maximizing the minimum *** doing so,we jointly optimize the beamformers,the rate splitting vector at the transmitter,as well as the phase shifts at *** solve it,we divide the original optimization problem into two subproblems and alternately optimize the *** beamforming and rate splitting optimization subproblem is solved by using the successive convex approximation *** phase shift optimization subproblem is solved through the penalty function method to achieve a rank-one locally optimal *** demonstrate that the proposed MMF-RIS-RSMA scheme can obtain significant performance gain in terms of the minimum group-rate.

关键词： multigroup multicast communications rate-splitting multiple access(RSMA) reconfigurable intelligent surfaces(RIS) max-min fairness(MMF)

Acute Effects of Low Temperatures and Cold Waves on Elderly Infectious Pneumonia Mortality—Jinan City,Shandong Province,China,2014-2022

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China CDC weekly 2024年第5期6卷 77-82,I0002-I0005页

作者： Huiyun Chang Mingjun li Ying Wang liangliang Cui tiantian li Jinan Municipal Center for Disease Control and Prevention Jinan Municipal Center for Disease Control and Prevention Affiliated to Shandong UniversityJinan CityShandong ProvinceChina Chinese Filed Epidemiology Training Program Chinese Center for Disease Control and PreventionBeijingChina China CDC Key Laboratory of Environment and Population Health National Institute of Environmental HealthChinese Center for Disease Control and PreventionBeijingChina

Summary What is already known about this topic?The mortality rate due to pneumonia varies depending on the infectious agents present in a low-temperature *** is added by this report?This study aimed to examine the relationship between low temperatures and cold waves and the risk of mortality from infectious pneumonia in the *** findings indicate a significant increase in the risk of infectious pneumonia.

关键词： environment Shandong finding

Climate change, environmental factors, and COVID-19: Current evidence and urgent actions

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The Innovation 2021年第3期2卷 11-12页

作者： Runmei Ma Peng Du tiantian li China CDC Key Laboratory of Environment and Population Health National Institute of Environmental HealthChinese Center for Disease Control and PreventionBeijing 100021China

The novel coronavirus disease(COVID-19)has triggered an international health crisis that began in late *** number of COVID-19 cases globally remains at the highest levels,and variants of the SARS-CoV-2 being reported around the world have caused special *** COVID-19 pandemic requires a regular global *** is the case with other infectious respiratory diseases,COVID-19 may be affected by climatic,meteorological,and environmental factors,including temperature,humidity,and air *** interactive effects of these factors on population health are ***,policy responses to COVID-19 have substantially affected socio-economic systems and people’s lifestyles,which in turn had an impact on climate by reducing emissions and population adaptations under the background of climate change,and even further affected the human *** actions are needed to respond to both climate change and COVID-19,and in turn the climate impacts of the COVID-19 pandemic(Figure 1).

关键词： climate meteorological humidity