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Efficient Multi-Tenant Virtual Machine Allocation in Cloud Data Centers

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Tsinghua Science and Technology 2015年第1期20卷 81-89页

作者： jiaxin li Dongsheng li Yuming Ye Xicheng Lu the National Key Laboratory of Parallel and Distributed Processing (PDL) College of Computer National University of Defense Technology

Virtual Machine（VM） allocation for multiple tenants is an important and challenging problem to provide efficient infrastructure services in cloud data centers. Tenants run applications on their allocated VMs, and the network distance between a tenant＇s VMs may considerably impact the tenant＇s Quality of Service（Qo S）. In this study, we define and formulate the multi-tenant VM allocation problem in cloud data centers, considering the VM requirements of different tenants, and introducing the allocation goal of minimizing the sum of the VMs＇ network diameters of all tenants. Then, we propose a Layered Progressive resource allocation algorithm for multi-tenant cloud data centers based on the Multiple Knapsack Problem（LP-MKP）. The LP-MKP algorithm uses a multi-stage layered progressive method for multi-tenant VM allocation and efficiently handles unprocessed tenants at each stage. This reduces resource fragmentation in cloud data centers, decreases the differences in the Qo S among tenants, and improves tenants＇ overall Qo S in cloud data centers. We perform experiments to evaluate the LP-MKP algorithm and demonstrate that it can provide significant gains over other allocation algorithms.

关键词： virtual machine allocation cloud data center multiple tenants multiple knapsack problem

Development of Hybrid ARQ Protocol for the Quantum Communication System on Stabilizer Codes

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China Communications 2021年第2期18卷 40-48页

作者： jiaxin li Zhongwen Guo Hongyang Ma College of Information Science and Engineering Ocean University of ChinaQingdao 266100China School of Science Qingdao University of TechnologyQingdao 266033China

In this paper,we develop a novel hybrid automatic-repeat-request(ARQ)protocol for the quantum communication system using quantum stabilizer *** quantum information is encoded by stabilizer codes to against the channel *** twophoton entangled state is prepared for codeword secure *** ARQ protocol rules the recognition and retransmission of error *** this protocol,the property of quantum entangled state ensures the security of information,the theory of hybrid ARQ system improves the reliability of transmission,the theory of quantum stabilizer codes corrects the flipping errors of ***,we verify the security and throughput efficiency of this protocol.

关键词： quantum communication system hybrid ARQ quantum stabilizer codes reliability security

Identifying the scope of the Lhasa Metropolitan Area based on a spatial field energy model

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Journal of Geographical Sciences 2021年第2期31卷 245-264页

作者： WANG Zhenbo li jiaxin liANG Longwu Institute of Geographic Sciences and Natural Resources Research CASBeijing 100101China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China

The cultivation and development of modern metropolitan areas with the aim of establishing new regional centers with competitive edge is a key objective for the new-type urbanization directions in *** construction of the Lhasa Metropolitan Area is of great significance for the promotion of the South Asia Channel,the‘Belt and Road’initiative,the Bangladesh-China-India-Myanmar Economic Corridor,the Himalaya Economic Cooperation Zone,and for rapid development and long-term stability of the Qinghai-Tibet *** paper examines the scope of the Lhasa Metropolitan Area including Chengguanqu(Chengguan District),Doilungdeqen,Dagze,Lhunzhub,Damxung,Nyemo,Quxu,Maizhokunggar,Samzhubze Qu(Samzhubze District),Gyangze,Rinbung,Bainang,Nedong,Gonggar,and Zhanang using a spatial field energy model that combines nodality and accessibility indices and considers multiple indicators including traffic flow between *** combining factors such as the natural background,population agglomeration,the social economy,infrastructure construction,and the urban spatial structure of the Lhasa Metropolitan Area,it is proposed to build a bow-and-arrow-shaped urban system with‘one core,two centers,one axis,and two wings’along the valleys and the transportation trunk lines of the *** study advocates the construction of a pure land industrial system comprising a green cultural and tourism-oriented plateau.

关键词： Lhasa Metropolitan Area spatial scope spatial field energy model development path

Optimal social welfare:A many-to-many data transaction mechanism based on double auctions

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Digital Communications and Networks 2023年第5期9卷 1230-1241页

作者： Jingyuan Duan ling Tian Jianqiao Mao jiaxin li School of Computer Science and Engineering University of Electronic Science and Technology of ChinaChengdu611731China Shenzhen Institute of Information Technology China Department of Electronic and Electrical Engineering University College LondonGower StreetLondonUnited Kingdom Amazon(China)Investment Ltd China

With the development of Big Data and the Internet of Things(IoT),the data value is more significant in both academia and *** can achieve maximal data value and prepare data for smart city *** to data's unique characteristics,such as dispersion,heterogeneity and distributed storage,an unbiased platform is necessary for the data trading market with rational trading ***,there are multiple buyers and sellers in a practical data trading market,and this makes it challenging to maximize social *** solve these problems,this paper proposes a Social-Welfare-Oriented Many-to-Many Trading Mechanism(SOMTM),which integrates three entities,a trading process and an algorithm named Many-to-Many Trading Algorithm(MMTA).Based on the market scale,market dominated-side and market fixed-side,simulations verify the convergency,economic properties and efficiency of SOMTM.

关键词： Data trading Double auction Social welfare Game theory Smart city

Delving into high-quality SVBRDF acquisition: A new setup and method

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Computational Visual Media 2024年第3期10卷 523-541页

作者： Chuhua Xian jiaxin li Hao Wu Zisen lin Guiqing li School of Computer Science and Engineering South China University of TechnologyGuangzhou 510006China Guangdong Shidi Intelligence Technology Ltd.Guangzhou 510000China

In this study, we present a new andinnovative framework for acquiring high-qualitySVBRDF maps. Our approach addresses the limitations of the current methods and proposes a newsolution. The core of our method is a simple hardwaresetup consisting of a consumer-level camera, LEDlights, and a carefully designed network that canaccurately obtain the high-quality SVBRDF propertiesof a nearly planar object. By capturing a ﬂexiblenumber of images of an object, our network usesdifferent subnetworks to train different property mapsand employs appropriate loss functions for each ofthem. To further enhance the quality of the maps, weimproved the network structure by adding a novel skipconnection that connects the encoder and decoder withglobal features. Through extensive experimentation usingboth synthetic and real-world materials, our resultsdemonstrate that our method outperforms previousmethods and produces superior results. Furthermore,our proposed setup can also be used to acquire physicallybased rendering maps of special materials.

关键词： acquisition setup SVBRDF acquisition material capture global skip connection

Picture Quality Assessment-Based on Rate Control for Variable Bandwidth Networks

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Tsinghua Science and Technology 2018年第4期23卷 396-405页

作者： ling Tian jiaxin li Yimin Zhou Hongyu Wang School of Computer Science and Engineering University of Electronic Science and Technology of China

The growing popularity of Internet applications and services has rendered high subjective video quality crucial to the user experience. Increasing needs for better video resolution and faster transmission bandwidths present challenges to the goal of achieving balance between video quality and coding cost. In this paper, we propose a Perceptive Variable Bit-Rate Control （PVBRC） framework for the state-of-the-art video coding standard High-Efficiency Video Coding （HEVC）/H.265. PVBRC allocates a bit-rate to a picture while taking a Comprehensive Picture Quality Assessment （CPQA） model and perceptive target bit-rate allocation into consideration. The CPQA model calculates the objective and perceptive quality of both source and reconstructed pictures by referring to the human vision system. The coding bit-rate is then dynamically allocated by the result of the CPQA model according to differences in picture content. In PVBRC, the quantization parameter for current picture encoding is updated by an effective fuzzy logical controller to satisfy the transmission requirements of the Internet of Things. Experimental results show that the proposed PVBRC can achieve average bit savings by 11.49% when compared with constant bit-rate control under the same objective and subjective video quality.

关键词： variable bit rate picture quality assessment rate control networking bandwidth

Neutrophil-mimetic hybrid liposome with ROS cascade amplification for synergistic ferroptosis-photodynamic therapy of breast cancer

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Nano Research 2024年第11期17卷 9932-9941页

作者： jiaxin li jiaxin li Jiao He Xuan He Dong Chen Ziyan Dong lin Xiong Wenjing Bai Man li Rong Guo Qin He Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry and Sichuan Province Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology Med-X Center for Materials West China School of Pharmacy Sichuan University Chengdu 610041 China Department of Biochemistry and Molecular Biology West China School of Basic Medical Sciences and Forensic Medicine Sichuan University Chengdu 610041 China

Photodynamic therapy (PDT) and ferroptosis therapy have received extensive attention in breast cancer treatment. PDT induced apoptosis of tumor cells by producing a large amount of reactive oxygen species (ROS) under laser irradiation. Differently, ferroptosis therapy exerts its antitumor effect by inducing excessive accumulation of lipid peroxides on tumor cell membranes. Based on that, ROS produced by PDT may promote ferroptosis in tumor cells, and ferroptosis therapy is expected eliminate apoptosis-resistant tumor cells. Therefore, a synergistic ferroptosis-photodynamic therapy will be more effective and more potential in breast cancer treatment. Considering PDT has the characteristic of producing ROS, and neutrophil has a natural tendency to ROS, a neutrophil-mimetic hybrid liposome (CR-NML) was designed for co-delivery of the photosensitizer Ce6 and the ferroptosis inducer RSL3. CR-NML targeted tumor through the ROS tendency of neutrophil and the enhanced permeability and retention (EPR) effect of liposome, then induced both apoptosis and ferroptosis in tumor cells, which increased ROS level and finally realized ROS cascade amplification. The synergistic ferroptosis-photodynamic therapy demonstrated significant therapeutic efficacy in 4T1 tumor bearing mice, which provided a promising strategy for breast cancer treatment.

关键词： neutrophil-mimetic hybrid liposome reactive oxygen species(ROS)cascade amplification photodynamic therapy ferroptosis therapy breast cancer

Species spatial distributions in a warm-temperate deciduous broad-leaved forest in China

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Journal of Forestry Research 2020年第4期31卷 1187-1194页

作者： Huiyan Gu jiaxin li Guang Qi Shunzhong Wang School of Forestry Northeast Forestry UniversityHarbin 15004People’s Republic of China Key Laboratory of Ecological Restoration in Hilly Areas Pingdingshan UniversityPingdingshan 467000People’s Republic of China State Key Laboratory of Vegetation and Environment Change Institute of BotanyChinese Academy of SciencesBeijing 100093People’s Republic of China

Spatial distribution is fundamental for understanding species coexistence mechanisms in forest *** we comprehensively explored fine-scale spatial patterns of tree species in a secondary warm-temperate deciduous broad-leaved forest community in north *** distribution patterns were *** functional traits had no significant effects on their spatial *** aggregation intensity decreased with increasing DBH and *** multivariate linear stepwise regression showed that abundance and maximum DBH were correlated with the aggregation *** results partially confirm that species attributes(abundance,DBH)and habitat heterogeneity may primarily contribute to spatial patterns and species coexistence in this secondary forest.

关键词： Spatial distributions Aggregation intensity Species functional trait Secondary warm-temperate deciduous broad-leaved forest

Decontamination of heavy metal complexes by advanced oxidation processes:A review

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Chinese Chemical Letters 2020年第10期31卷 2575-2582页

作者： Junqun Du Baogang Zhang jiaxin li Bo Lai School of Water Resources and Environment MOE Key Laboratory of Groundwater Circulation and Environmental EvolutionChina University of Geosciences(Beijing)Beijing 100083China State Key Laboratory of Hydraulics and Mountain River Engineering College of Architecture and EnvironmentSichuan UniversityChengdu 610065China

Heavy metal complexes with high mobility are widely distributed in wastewater from modern industries,which are mo re stable and refracto ry than free heavy metal *** re movals from wastewater draw increasing attentions and various technologies have been developed,among which advanced oxidation processes(AOPs)are more effectively and *** on five representative types of AOPs,including Fenton(like)oxidation,electrochemical oxidation,photocatalytic oxidation,ozonation and discharge plasma oxidation for heavy metal complexe s degradation are summarized in this *** rationales,advantages,applications,challenges and prospects are introduced *** among these AOPs,such as electrochemical Fenton oxidation and photoelectrocatalytic oxidation,are also comprehensively *** efforts should be made to reduce acid requirement and scale up for practical applications of AOPs for heavy metal complex degradation efficiently and cost-effectively.

关键词： Advanced oxidation processes Heavy metal complexes Mechanism Wastewater