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BCDC： A High-Performance, Server-Centric Data Center Network

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Journal of Computer Science & Technology 2018年第2期33卷 400-416页

作者： xi Wang Jian-xi fan Cheng-Kuan Lin Jing-Ya Zhou Zhao Liu School of Computer Science and Technology Soochow University Suzhou 215006 China School of Software and Services Outsourcing Suzhou Institute of Industrial Technology Suzhou 215004 China

The capability of the data center network largely decides the performance of cloud computing. However, the number of servers in the data center network becomes increasingly huge, because of the continuous growth of the application requirements. The performance improvement of cloud computing faces great challenges of how to connect a large number of servers in building a data center network with promising performance. Traditional tree-based data center networks have issues of bandwidth bottleneck, failure of single switch, etc. Recently proposed data center networks such as DCell, FiConn, and BCube, have larger bandwidth and better fault-tolerance with respect to traditional tree-based data center networks. Nonetheless, for DCell and FiConn, the fault-tolerant length of path between servers increases in case of failure of switches; BCube requires higher performance in switches when its scale is enlarged. Based on the above considerations, we propose a new server-centric data center network, called BCDC, based on crossed cube with excellent performance. Then, we study the connectivity of BCDC networks. Furthermore, we propose communication algorithms and fault-tolerant routing algorithm of BCDC networks. Moreover, we analyze the performance and time complexities of the proposed algorithms in BCDC networks. Our research will provide the basis for design and implementation of a new family of data center networks.

关键词： data center network interconnection network crossed cube server-centric fault-tolerant

Phenol-triggered supramolecular transformation of titanium-oxo cluster based coordination capsules

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Chinese Chemical Letters 2021年第8期32卷 2415-2418页

作者： xi fan Lvbing Yuan Jian Zhang Lei Zhang State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China Fujian Provincial Key Laboratory of Polymer Materials College of Chemistry and Materials ScienceFujian Normal UniversityFuzhou 350007China

Supramolecular transformations of coordination cage or capsule have received much attention recently,which help elucidate this natural self-assembly behavior in biological *** current study describes the first supramolecular transformation of titanium-o rganic coordination capsule triggered by phenol(and H_(3) PO_(3)).The structural alterations are accompanied by the reconstruction of 5-coordinated Ti centers to 6-coordinated ***,different amounts of encapsulated phenol guest molecules can be identified,dependent on the sizes of the obtained *** addition,they display much better visible light absorption and air stability than the isopropanol stabilized ones.

关键词： Titanium-oxo clusters Phenol Supramolecular transformation Post-synthesis modulation Coordination capsules

Theory of gas extraction from coal seams and its use

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Journal of Coal Science & Engineering(China) 2012年第3期18卷 276-279页

作者： fan xi-sheng Mine Safety Technology Branch China Coal Research InstituteBeijing 100013China State Key Laboratory of Coal Mining and Clean Utilization(China Coal Research Institute) Beijing 100013China

Gas extraction is one of the main measures of control and use of gas of coal mines. At present, the design method is under the experimental period and do not satisfy the need of practice. In this paper, the theory of gas extraction of coal seams based upon Darcy law was studied. Mathematical model of gas extraction of coal seams was established and two kinds of solv- ing approaches based on computer software and linear approximation were given. The rightness and the validities of the model were examined with a practical example. Results obtained can be used to determine and optimize the parameters related etc.

关键词： coal seam gas gas extraction linear approximation

Enhanced Power Conversion Efficiency in Bulk Heterojunction Polymer Solar Cells Through Dual-Interface Morphology Modification

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Wuhan University Journal of Natural Sciences 2013年第3期18卷 195-200页

作者： fan xi fanG Guojia School of Physics and Technology/Key Laboratory of Artificial Micro-and Nano-structures of Ministry of Education Wuhan University

Efficient bulk heterojunction（BHJ） polymer solar cells with a poly（3,4-ethylenedioxythiophene）：poly（styrenesulfonate） hole transfer layer（HTL） were fabricated via controlling the spin coating speed of the HTL solution on a particular fluorinated tin oxide substrates of a high *** shows that the functions of the photovoltaic devices increase with the increase of the HTL surface ***,an imprinting technique was employed to transfer a suitable pattern of nanostructure arrays to the surface of active *** the optimized spin coating speed,the photovoltaic devices exhibited a 28.4% increase in efficiency after this imprinting treatment compared with that of nonimprinted photovoltaic *** is mainly attributed to the achievement of high interface areas between active layers and electrodes,which not only increases optical absorption by scattering but also facilitates charge carrier collection.

关键词： interface morphology imprinting bulk heterojunction polymer solar cell

Optimally Embedding 3-Ary n-Cubes into Grids

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Journal of Computer Science & Technology 2019年第2期34卷 372-387页

作者： Wei-Bei fan Jian-xi fan Cheng-Kuan Lin Yan Wang Yue-Juan Han Ru-Chuan Wang School of Computer Science and Technology Soochow University Suzhou 215006 China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Nanjing 210003 China College of Mathematics and Computer Science Fuzhou University Fuzhou 350108 China

The 3-ary n-cube,denoted as Qn3,is an important interconnection network topology proposed for parallel computers,owing to its many desirable properties such as regular and symmetrical structure,and strong scalability,among *** this paper,we first obtain an exact formula for the minimum wirelength to embed Qn3 into *** then propose a load balancing algorithm for embedding Qn3 into a square grid with minimum dilation and ***,we derive an O(N2)algorithm for embedding Qn3 into a gird with balanced communication,where N is the number of nodes in *** experiments are performed to verify the total wirelength and evaluate the network cost of our proposed embedding algorithm.

关键词： 3-ary n-cube embedding algorithm grid interconnection network

A Cost-Efficient Approach to Storing Users'Data for Online Social Networks

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Journal of Computer Science & Technology 2019年第1期34卷 234-252页

作者： Jing-Ya Zhou Jian-xi fan Cheng-Kuan Lin Bao-Lei Cheng School of Computer Science and Technology Soochow UniversitySuzhou 215006China Provzncial Key Laboratory for Computer Information Processing Technology Soochow UniversitySuzhou 215006China Collaborative Innovation Center of Novel Software Technology and Industrialization Nanjing University Nanjing 210023China

As users increasingly befriend others and interact online via their social media accounts,online social networks (OSNs)are expanding *** with the big data generated by users,it is imperative that data storage be distributed,scalable,and *** one of the most significant challenges about this topic is determining how to minimize the cost without deteriorating system *** many storage systems use the distributed key value store,it cannot be directly applied to OSN storage *** because users'data are highly correlated,hash storage leads to frequent inter-server communications,and the high inter-server traffic costs decrease the OSN storage system's scalability. Previous studies proposed conducting network partitioning and data replication based on social ***,data replication increases storage costs and impacts traffic ***,we consider how to minimize costs from the perspective of data storage,by combining partitioning and *** cost-efficient data storage approach supports scalable OSN storage *** proposed approach co-locates frequently interactive users together by conducting partitioning and replication simultaneously while meeting load-balancing *** experiments are undertaken on two real- world traces,and the results show that our approach achieves lower cost compared with state-of-the-art *** we conclude that our approach enables economic and scalable OSN data storage.

关键词： online social network inter-server traffic cost storage cost network partitioning data replication

Assembly and packing models of [Ti_(6)Co_(12)] ring based on the titanium-capped cobalt clathrochelates

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Chinese Chemical Letters 2021年第2期32卷 923-925页

作者： Hao Fu Shuyu Zhou xi fan Lei Zhang Jian Zhang State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter.Chinese Academy of SciencesFuzhou 350002China School of Physical Science and Technology Shanghai Tech UniversityShanghai 201210China University of Chinese Academy of Sciences Beijing 100049China

In this work,titanium-capped cobalt clathrochelates have been applied as secondary building units(SBUs) fo r the construction of supramolecular *** heterometallic wheel-like [Ti_(6) Co_(12)] complexes based on cobalt clathrochelates,[C_(6)H_(15)N_(4)]_(2)[TiCo_(2)(μ_(2)-Oipr)(Oipr)_(2)(Dmg)_(3)]_(6)(2,Dmg=dimethy[glyoxime) and H_(6)[TiCo_(2)(μ_(2)-Oipr)(Oipr)_(2)(Dmg)_(3)]_(6)(3),have been successfully synthesized and *** supramolecular stacking modes of these wheels are largely dependent on the applied synthetic conditions,which further impact their gas adsorption properties.

关键词： Titanium-oxo clusters Wheel-like molecule Coordination self-assembly Heterometallic complexes Clathrochelates

Controllable Condensation of Aromatics and Its Mechanisms in Carbonization

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China Petroleum Processing & Petrochemical Technology 2024年第1期26卷 34-46页

作者： fan xi Wang Chunlu Luo Yang Ren Qiang Shen Haiping Long Jun Sinopec Research Institute of Petroleum Processing Co. Ltd.Beijing 100083China

In order to obtain liquefied products with higher yields of aromatic molecules to produce mesophase pitch,a good understanding of the relevant reaction mechanisms is *** molecular dynamics simulations were used to study the thermal reactions of pyrene,1-methylpyrene,7,8,9,10-tetrahydrobenzopyrene,and mixtures of pyrene with 1-octene,cyclohexene,or *** reactant conversion rates,reaction rates,and product distributions were calculated and compared,and the mechanisms were analyzed and *** results demonstrated that methyl and naphthenic structures in aromatics might improve the conversion rates of reactants in hydrogen transfer processes,but their steric hindrances prohibited the generation of high *** naphthenic structures could generate more free radicals and presented a more obvious inhibition effect on the condensation of polymers compared with the methyl side *** was discovered that when different olefins were mixed with pyrene,1-octene primarily underwent pyrolysis reactions,whereas cyclohexene mainly underwent hydrogen transfer reactions with pyrene and styrene,mostly producing superconjugated biradicals through condensation reactions with *** the mixture systems,the olefins scattered aromatic molecules,hindering the formation of pyrene trimers and higher *** to the reactive molecular dynamics simulations,styrene may enhance the yield of dimer and enable the controlled polycondensation of pyrene.

关键词： carbonization controllable condensation aromatics mechanisms molecular simulation

Fault-Tolerant Hamiltonicity and Hamiltonian Connectivity of BCube with Various Faulty Elements

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Journal of Computer Science & Technology 2020年第5期35卷 1064-1083页

作者： Gui-Juan Wang Cheng-Kuan Lin Jian-xi fan Jing-Ya Zhou Bao-Lei Cheng School of Computer Science and Technology Soochow UniversitySuzhou 215006China School of Computer Science and Technology Qilu University of Technology(Shandong Academy of Sciences)Jinan 250353China College of Mathematics and Computer Science Fuzhou UniversityFuzhou 350108China

BCube is one kind of important data center *** and Hamiltonian connectivity have significant applications in communication *** far,there have been many results concerning fault-tolerant Hamiltonicity and fault-tolerant Hamiltonian connectivity in some data center ***,these results only consider faulty edges and faulty *** this paper,we study the fault-tolerant Hamiltonicity and the fault-tolerant Hamiltonian connectivity of BCube(n,k)under considering faulty servers,faulty links/edges,and faulty *** any integers n≥2 and k≥0,let BCn,k be the logic structure of BCube(n,k)and F be the union of faulty elements of BCn,k,Let fv/fe,and fs be the number of faulty servers,faulty edges,and faulty switches of BCiLbe(n,k),*** show that BCnik-F is fault-tolerant Hamiltonian if fv+fe+(n-1)/s≤(n-1)(k+1)-2 and BCn,k-F is fault-tolerant Hamiltonian-connected ifv,+fe+(n-1)fs≤(n-1)(k+1)-*** the best of our knowledge,this paper is the first work which takes faulty switches into account to study the fault-tolerant Hamiltonicity and the fault-tolerant Hamiltonian connectivity in data center networks.

关键词： data center network BCube fault-tolerance Hamiltonicity Hamiltonian connectivity