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Competitive Cloud Pricing for Long-Term Revenue Maximization

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Journal of Computer Science & Technology 2019年第3期34卷 645-656页

作者： Jiang Rong tao qin Bo An Institute of Computing Technology Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Microsoft Research Asia Beijing 100080China School of Computer Science and Engineering Nanyarig Technological UniversitySingapore 639798Singapore

We study the pricing policy optimization problem for cloud providers while considering three properties of the real-world market:1)providers have only incomplete information about the market;2)it is in evolution due to the increasing number of users and decreasing marginal cost of providers:3)it is fully competitive because of providers'and users'revenuedriven *** far as we know,there is no existing work investigating the optimal pricing policies under such realistic *** first propose a comprehensive model for the real-world cloud inarket and formulatc it as a stochastic *** we use the Markov perfect equilibrium(MPE)to describe providers5 optimal *** we decompose the problem of computing the MPE into two subtasks:1)dividing the stochastic game into many normal-formal games and calculating their Nash equilibria,for which we develop an algorithm ensuring to converge,and 2)computing the MPE of the original game,which is efficiently solved by an algorithm combining the Nash equilibria based on a mild *** results show that our algorithms are efficient for computing MPE and the MPE strategy leads to much higher profits for providers compared with existing policies.

关键词： cloud computing Markov perfect equilibrium game theory revenue maximization

Scheme for Implementation of Optimal Cloning of Arbitrary Single Particle Atomic State into Two Photonic States

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Communications in Theoretical Physics 2008年第6期49卷 1515-1518页

作者： SONG Wei qin tao Institute for Condensed Matter Physics School of Physics and Telecommunication Engineering South China Normal University Chuangzhou 510006 China Hefei National Laboratory for Physical Science at Microscale and Department of Modern Physics University of Science and Technology of China Hefei 230026 China

We present a feasible scheme to implement the 1→2 optimal cloning of arbitrary single particle atomic state into two photonic states, which is important for applications in long distance quantum communication. Our scheme also realizes the tele-NOT gate of one atom to the distant atom trapped in another cavity. The scheme is based on the adiabatic passage and the polarization measurement. It is robust against a number of practical noises such as the violation of the Lamb Dicke condition, spontaneous emission, and detection inefficiency.

关键词： optimal cloning atomic state photonic state

Computational pricing in Internet era

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Frontiers of Computer Science 2018年第1期12卷 40-54页

作者： Fei TIAN tao qin Tie-Yan LIU Microsoft Research Asia Beijing 100080 China

Pricing plays a central rule to a company＇s prof- itability, and therefore has been extensively studied in the literature of economics. When designing a pricing mech- anism/model, an important principle to consider is ＂price discrimination＂, which refers to selling the same resources with different prices according to different values of buy- ers. To meet the ＂price discrimination＂ principle, especially when the number of buyers is large, computational methods, which act in a more accurate and principled way, are usu- ally needed to determine the optimal allocation of sellers＇ re- sources （whom to sell to） and the optimal payment of buyers （what to charge）. Nowadays, in the Internet era in which quite a lot of buy and sell processes are conducted through Internet, the design of computational pricing models faces both new challenges and opportunities, considering that （i） nearly real- time interactions between people enable the buyers to reveal their needs and enable the sellers to expose their information in a more expressive manner, （ii） the large-scale interaction data require powerful methods for more efficient processing and enable the sellers to model different buyers in a more precise manner. In this paper, we review recent advances on the analysis and design of computational pricing models for representative Internet industries, e.g., online advertising and cloud computing. In particular, we introduce how computa- tional approaches can be used to analyze buyer＇s behaviors （i.e., equilibrium analysis）, improve resource utilization （i.e., social welfare analysis）, and boost seller＇s profit （i.e., revenue analysis）. We also discuss how machine learning techniques can be used to better understand buyer＇s behaviors and design more effective pricing mechanisms, given the availability oflarge scale data. Moreover, we make discussions on future re- search directions on computational pricing, which hopefully can inspire more researchers to contribute to this important

关键词： computational pricing price discrimination on-line advertising cloud computing mechanism design

Simulated evolution process of core-shell microstructures

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Science China(Physics,Mechanics & Astronomy) 2007年第4期50卷 546-552页

作者： qin tao WANG HaiPeng WEI BingBo Department of Applied Physics Northwestern Polytechnical UniversityXi’an 710072China

The evolution process of core-shell microstructures formed in monotectic alloys under the space environment condition was investigated by the numerical simula- tion method. In order to account for the effect of surface segregation on phase separation, Model H was modified by introducing a surface free energy term into the total free energy of alloy droplet. Three Fe-Cu alloys were taken as simulated examples, which usually exhibit metastable phase separation in undercooled and microgravity states. It was revealed by the dynamic simulation process that the formation of core-shell microstructures depends mainly on surface segregation and Marangoni convection. The phase separation of Fe65Cu35 alloy starts from a dispersed structure and gradually evolves into a triple-layer core-shell micro- structure. Similarly, Fe50Cu50 alloy experiences a structural evolution process of "bicontinuous phase → quadruple-layer core-shell → triple-layer core-shell", while the microstructures of Fe35Cu65 alloy transfer from the dispersed structure into the final double-layer core-shell morphology. The Cu-rich phase always forms the outer layer because of surface segregation, whereas the internal microstructural evolu- tion is controlled mainly by the Marangoni convection resulting from the tempera- ture gradient.

关键词： space environment Fe-Cu alloy phase separation core-shell structure numerical simulation

Joint information transmission design for intelligent reflecting surface aided system with discrete phase shifts

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Science China(Information Sciences) 2023年第3期66卷 253-262页

作者： qin tao Shuowen ZHANG Caijun ZHONG Yushu ZHANG College of Information Science and Electronic Engineering Zhejiang University Department of Electronic and Information Engineering The Hong Kong Polytechnic University Aerospace Information Research Institute Chinese Academy of Sciences

This paper studies the joint information transmission for an intelligent reflecting surface(IRS)aided single-input multiple-output(SIMO) communication system, where an IRS with discrete phase shifts aims to deliver its sensed information to the receiver, besides being a helper of the SIMO system. We first introduce the joint modulation strategy for delivering the information of the primary system and the IRS simultaneously. Specifically, the IRS modulates its information in both the received antenna index and the received signal phase; while the transmitter limits its signal phase in a small region to avoid aliasing. For the proposed strategy, we devise an IRS discrete phase shifts design to maximize the received signal power at the selected receive antenna. Then, we propose a receiver constellation design for the IRS’s and transmitter’s information to maximize the minimum Euclidean distance. Numerical results show that the proposed scheme is practical and competitive compared with several existing joint information transmission schemes.

关键词： IRS information transmission constellation design

Experimental research on inorganic solidified foam for sealing air leakage in coal mines

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International Journal of Mining Science and Technology 2013年第1期23卷 151-155页

作者： Bo tao qin Yi Lu Key Laboratory of Gas and Fire Control for Coal Mines Faculty of Safety Engineering China University of Mining & Technology

In order to efficiently seal air leakages and control spontaneous combustion of coal, solidified foam was developed by adding a certain compound additive to fly coal ash and cement as the main materials. It was prepared basing on the foaming characteristic through physical and mechanical system. We studied the effects of the different types of foaming agents, the mass ratio of cement to fly ash, and the mass ratio of solid to water and content of cellulose on the performance of solidified foam. The results show that when adding the composite protein, surfactant and cellulose foaming agents. The cement-fly ash ratio of 0.75:1, the water solid ratio as large as 2:1, and the solidified foam with high properties and density of only 516 kg/m 3 and compressive strength of up to 12.68 MPa were prepared. But the initial setting time, identity and compressive strength may be changed by varying the water solid ratio and/or the additives. We theoretically analyzed the influence mechanism of foam density, compressive strength and water solid ratio. The solidified foam is especially suitable for sealing surface leakage channels and filling the goaf with a wide application prospects.

关键词： Spontaneous combustion of coal Air leakage Inorganic solidified foam Cellulose

LOWER TEMPERATURE 1 Enhances ABA Responses and Plant Drought Tolerance by Modulating the Stability and Localization of C2-Domain ABA-Related Proteins in Arabidopsis

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Molecular Plant 2019年第9期12卷 1243-1258页

作者： tao qin Qiuzhen Tian Guifeng Wang Liming Xiong College of Grassland Agriculture Northwest A&F UniversityYangling 712100China Key Laboratory of Wheat and Maize Crops Science Collaborative Innovation Center of Henan Grain CropsCollege of AgronomyHenan Agricultural UniversityZhengzhou 450002China Department of Biology Hong Kong Baptist UniversityKowloon TongHong KongChina Texas A&M Agrilife Research Center DallasTXUSA State Key Laboratory of Agrobiotechnology Chinese University of Hong KongMa Liu ShuiHong KongChina

Plasma membrane-associated abscisic acid(ABA)signal transduction is an integral part of ABA *** C2-domain ABA-related(CAR)proteins play important roles in the recruitment of ABA receptors to the plasma membrane to facilitate ABA ***,how CAR proteins are regulated remains *** this study,we conducted a genetic screen for mutants with altered leaf transpiration and identified an uncharacterized protein,LOWER TEMPERATURE 1(LOT1),which regulates the dynamic localization and stability of CAR *** lotimutant had a lower leaf temperature as compared with the wild type due to higher *** found that LOT1 physically interacts with CAR9,and ABA reduces LOT1-CAR9 interaction in the nucleus,likely via Ca^2+,resulting in increased localization of CAR9 to the plasma *** further found that the stability of CAR9 is affected by LOT1 less CAR9 proteins were accumulated and more were ubiquitinated in *** the lot1 car9 and/of f car9 mutants were hyposerisitive to ABA,the hyposensitive phenotype of loticould be rescued by CAR9 ***,our study reveals that LOT1 regulates plant tolerance to drought stress by affecting ABA signaling through regulating the stability and dynamic localization of CAR9.

关键词： LOT1 CAR9 Drought tolerance ABA signaling Stomata transpiration

Cobalt(Ⅲ)hydride HAT mediated enantioselective intramolecular hydroamination access to chiral pyrrolidines

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Science China Chemistry 2024年第6期67卷 2002-2008页

作者： Qi Meng tao qin Huanran Miao Ge Zhang Qian Zhang Jilin Province Key Laboratory of Organic Functional Molecular Design&Synthesis Department of ChemistryNortheast Normal UniversityChangchun130024China State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic ChemistryChinese Academy of SciencesShanghai200032China

Enantioenriched pyrrolidines and derivatives are ubiquitous substructures in compounds of importance to medicinal and biological ***,we report an efficient cobalt-catalyzed intramolecular asymmetric hydroamination reaction that produces chiral pyrrolidines with good to excellent yield and *** with previously reported radicalinvolved methodologies for enantioenriched pyrrolidines,these conditions feature two elegant versatilities,enabling(1)the use of cobalt-catalyzed hydrogen atom transfer(HAT)to generate organocobalt intermediates that bring radical reaction to organometallic chemistry,and(2)enantioselective intramolecular C-N bond forging through an S_(N)2-like displacement involving dynamic kinetic resolution(DKR).This approach provides a new alternative and efficient methodology for enantioselective radical-involved C-N bond construction that can be used in the synthesis of both chiral pyrrolidines and homologous nitrogen heterocycles.

关键词： asymmetric catalysis radical hydroamination cobalt catalysis hydrogen atom transfer

A Proposed Batch In vitro Apparatus for Conducting Rumen FermentationExperiment

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Agricultural Sciences in China 2008年第7期7卷 887-894页

作者： ZHANG Guang-qin REN Hong-tao College of Animal Science Henan University of Science and Technology Luoyang 471003 P.R. China

This research proposes a batch in vitro rumen apparatus modified from Daisy incubator and procedures of measuring feed digestion by using nylon bag to replace the traditional centrifuging and filtration methods, for the purpose of studying ruminal fermentation. The apparatus consists of 8 sets of airtight reaction vessels which rotated at a speed of 1 r/min and located inside a thermostatic cabin. Optimum procedures was proved to be that the volume of incubation fluid was 400 mL; fineness and size of test feed were 0.125-0.25 mm and 0.4 g, respectively; amount of bags in one vessel was 6; fermentation diet in a single incubation was 4-5 g. Comparing experiments showed that fermentation speed attained with the apparatus was about 15-20% greater than that attained with flask-shaking machine method （revolutionary speed is 100 r/min） and more accurate results could be obtained with the new apparatus. In conclusion, this apparatus could provide an efficient mixing action, and the procedure could allow sensitive detection of differences in ruminal fermentation in a time-saving way.

关键词： in vitro apparatus ruminal fermentation nylon bag