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Rethinking the architecture design of data center networks

Frontiers of Com.uter Science 2012年第5期6卷 596-603页

作者： Kaishun WU Jiang XIAO Lionel m. ni National Engineering Research Center of Digital Life State-Province Joint Laboratory of Digital Home Interactive Applications School of Physics and Engineering Sun Yat-sen University Guangzhou 510006 China Departm.nt of Com.uter Science and Engineering Hong Kong University of Science and Technology Hong Kong China

In the rising tide of the Internet of things, m.re and m.re things in the world are connected to the Internet. Recently, data have kept growing at a rate m.re than four tim.s of that expected in m.ore＇s law. This explosion of data com.s from.various sources such as m.bile phones, video cam.ras and sensor networks, which often present m.ltidi- m.nsional characteristics. The huge am.unt of data brings m.ny challenges on the m.nagem.nt, transportation, and pro- cessing IT infrastructures. To address these challenges, the state-of-art large scale data center networks have begun to provide cloud services that are increasingly prevalent. How- ever, how to build a good data center rem.ins an open chal- lenge. Concurrently, the architecture design, which signifi- cantly affects the total perform.nce, is of great research inter- est. This paper surveys advances in data center network de- sign. In this paper we first introduce the upcom.ng trends in the data center industry. Then we review som. popular design principles for today＇s data center network architectures. In the third part, we present som. up-to-date data center fram.- works and m.ke a com.rehensive com.arison of them. Dur- ing the com.arison, we observe that there is no so-called op- tim.l data center and the design should be different referring to the data placem.nt, replication, processing, and query pro- cessing. After that, several existing challenges and lim.tations are discussed. According to these observations, we point out som. possible future research directions.

关键词： data center networks switch-based networks,direct networks hybrid networks

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Rethinking big data in a networked world

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Frontiers of Com.uter Science 2016年第6期10卷 965-967页

作者： Lionel m. ni Haoyu TAN Jiang XIAO Departm.nt of Com.uter and Inform.tion Science University of Macao Macao China Fok Ying Tung Graduate School Hong Kong University of Science and Technology Hong Kong China

Since the early 21st century, big data has drawn m.ch attention from.both academ.a and industry. In the last decade of collecting m.ssive data, seeking innovative applications, and developing powerful technologies, the m.jor focus of the research and engineering in big data has shifted substantially in m.ny aspects. It is tim. to rethink about this fuzzy term.to m.ke clear the upcom.ng opportunities and the m.st urgent challenges.

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m.iewer： m.bile phone spatiotem.oral data viewer

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Frontiers of Com.uter Science 2014年第2期8卷 298-315页

作者： Jiansu PU Siyuan LIU Panpan XU Huam.n QU Lionel m. ni Departm.nt of Com.uter Science Hong Kong University of Science and Technology Hong Kong 999077 China iLab Heinz College Carnegie Mellon University Pittsburgh PA 15601 USA

Nowadays m.vem.nt patterns and people＇s be- havioral m.dels are needed for traffic engineers and city plan- ners. These observations could be used to reason about m.bil- ity and its sustainability and to support decision m.kers with reliable inform.tion. The very sam. knowledge about hum.n diaspora and behavior extracted from.these data is also valu- able to the urban planner, so as to localize new services, orga- nize logistics system. and to detect changes as they occur in the m.vem.nt behavior. m.reover, it is interesting to inves- tigate m.vem.nt in places like a shopping area or a working district either for com.ercial purposes or for im.roving the service quality. These kinds of tracking data are m.de avail- able by wireless and m.bile com.unication technologies. It is now possible to record and collect a large am.unt of m.bile phone calls in a city. Technologies for object tracking have recently becom. affordable and reliable and hence we were able to collect m.bile phone data from.a city in China from.January 1, 2008 to Decem.er 31, 2008. The large am.unt of phone call records from.m.bile operators can be considered as life m.tes and sensors of persons to inform.how m.ny peo- ple are present in any given area and how m.ny are entering or leaving. Each phone call record usually contains the caller and callee IDs, date and tim., and the base station where the phone calls are m.de. As m.bile phones are widely used in our daily life, m.ny hum.n behaviors can be revealed by an- alyzing m.bile phone data. Through m.bile phones, we can learn the inform.tion about locations, com.unications be- tween m.bile phone users during their daily *** this work, we propose a com.rehensive visual analysissystem.nam.d as m.iewer, m.bile phone spatiotem.oral data Viewer, which is the first system.to visualize and analyze the population＇s m.bility patterns from.m.llions of phone call records. Our system.consists of three m.jor com.onents： 1） visual analysis of user groups in

关键词： visual analysis m.bility pattern m.bile phone

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Pareto-based m.lti-objective node placem.nt of industrial wireless sensor networks using binary differential evolution harm.ny search

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Advances in m.nufacturing 2016年第1期4卷 66-78页

作者： Ling Wang Lu An Hao-Qi ni Wei Ye Panos m. Pardalos m.n-Rui Fei Shanghai Key Laboratory of Power Station Autom.tionTechnology School of Mechatronics Engineering andAutomation Shanghai University Shanghai 200072 People'sRepublic of China Departm.nt of Industrial and System. Engineering Centerfor Applied Optimization University of Florida GainesvilleFlorida 32611 USA

The reliability and real tim. of industrial wireless sensor networks （IWSNs） are the absolute requirem.nts for industrial system., which are two fore- m.st obstacles for the large-scale applications of IWSNs. This paper studies the m.lti-objective node placem.nt problem.to guarantee the reliability and real tim. of IWSNs from.the perspective of system.. A novel m.lti-objective node deploym.nt m.del is proposed in which the reliabil- ity, real tim., costs and scalability of IWSNs are addressed. Considering that the optim.l node placem.nt is an NP-hard problem. a new m.lti-objective binary differential evolu- tion harm.ny search （m.BDEHS） is developed to tackle it, which is inspired by the m.chanism.of harm.ny search and differential evolution. Three large-scale node deploy- m.nt problem. are generated as the benCHm.rks to verify the proposed m.del and algorithm. The experim.ntal results dem.nstrate that the developed m.del is valid and can be used to design large-scale IWSNs with guaranteed reliability and real-tim. perform.nce efficiently. m.reover, the com.arison results indicate that the proposed m.B- DEHS is an effective tool for m.lti-objective node place- m.nt problem. and superior to Pareto-based binary differential evolution algorithm., nondom.nated sorting genetic algorithm.II （NSGA-II） and m.dified NSGA-II.

关键词： Industrial wireless sensor networks (IWSNs)Node placem.nt Harm.ny search Differential evolutionPareto Real tim. Reliability

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Ordered proposition fusion based on consistency and uncertainty m.asurem.nts

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Science China(Inform.tion Sciences) 2017年第8期60卷 117-135页

作者： Dayou LIU Yungang ZHU ni ni Jie LIU College of Com.uter Science and Technology Jilin University Key Laboratory of Sym.olic Com.utation and Knowledge Engineering of m.nistry of Education Jilin University Beijing Entry-Exit Inspection and Quarantine Bureau

The fusion of ordered propositions is an im.ortant and widespread problem.in artificial intelligence,but existing fusion m.thods have difficulty handling the fusion of ordered propositions. In this paper, we propose a solution based on consistency and uncertainty m.asurem.nts. The m.in contributions of this paper are as follows. First, we propose the concept of convexity degree, m.an, and center of basic support function to com.rehensively describe the basic support function of ordered propositions. Second, we introduce entropy as a m.asure of uncertainty in the basic support function of ordered propositions. Third, we generalize the indeterm.nacy of the basic support function and propose a novel m.thod to m.asure the consistency between two basic support functions. Finally, based on the above researches, we propose a novel algorithm.for fusing ordered propositions. Theoretical analysis and experim.ntal results dem.nstrate that the proposed m.thod outperform. state-of-the-art m.thods.

关键词： uncertainty processing ordered proposition evidence theory dem.ster rule of com.ination inform.tion fusion

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Hepatitis C:a successful story of cure

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Science Bulletin 2016年第24期61卷 1884-1887页

作者： Yi ni Departm.nt of Infectious Diseases Molecular VirologyUniversity Hospital Heidelberg 69120 Heidelberg Germany

On Septem.er 23, the 2016 Lasker-DeBakey clinical m.dical research award cerem.ny was celebrated in New York City. This annual prize has been awarded by the Lasker Foundation for over 71 years, and it is the m.st prestigious biom.dical award in the United States, popu- larly known as ＂Am.rica＇s Nobel Prize＂. Indeed, 87 Lasker laureates have received the Nobel Prize, including 41 within the last 30 years （one exam.le is the Chinese pharm.ceutical chem.st Youyou Tu, who won the 2011 Lasker-DeBakey award and four years later received the Nobel Prize）. This year, the honor went to Ralf F. W. Bartenschlager （Heidelberg University, Germ.ny）, Charles m. Rice （Rockefeller University, NY, USA）, and m.chael J. Sofia （Arbutus Biopharm., PA, USA） for the developm.nt of cell culture system.to study the replication of Hepatitis C virus （HCV） and for the use of this system.to develop drugs capable of elim.nating Hepatitis C.

关键词：丙型肝炎病毒 m.chael 故事治愈诺贝尔奖生物制药开发能力培养系统

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Theoretical investigations of electrical transport properties in CoSb3 skutterudites under hydrostatic loadings

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Rare m.tals 2018年第4期37卷 316-325页

作者： Chongze Hu Peter ni Li Zhan Huijuan Zhao Jian He Terry m. Tritt Jingsong Huang Bobby G. Sum.ter Departm.nt of m.chanical Engineering Clemson UniversityClemson SC 29634 USA Departm.nt of m.chanical Engineering University of Minnesota-Twin Cities Minneapolis MN 55455 USA m.ntgom.ry High School Skillman NJ 08558 USA Departm.nt of Physics and Astronom. Clemson UniversityClemson SC 29634 USA Center for Nanophase m.terials Sciences and Com.utationalSciences and Engineering Division Oak Ridge National Laboratory Oak Ridge TN 37831 USA

CoSb3-based m.rk m.d-tem.erature skutterudites have been a benchtherm.electric m.terial under intensive experim.ntal and theoretical studies for decades. Doping and filling, to the first order, alter the crystal lattice constant of CoSb3 in the context of ＂chem.cal pressure.＂ In this work, we em.loyed ab initio density functional theory in conjunction with sem.classical Boltzm.nn transport theory to investigate the m.chanical properties and especially how hydrostatic loadings, i.e., ＂physical pressure,＂ im.act the electronic band structure, Seebeck coefficient, and power factor of pristine CoSb3. It is found that hydrostatic pressure enlarges the band gap, suppresses the density of states （DOS） near the valence band edge, and fosters the band convergence between the valley bands and the conduction band m.nim.m.（CBm.. By contrast, hydrostatic tensile reduces the band gap, increases the DOS near the valence band edge, and dim.nishes the valley bands near the CBm. Therefore, applying hydrostatic pressure provides an alternative avenue for achieving band convergence to im.rove therm.electric properties of N-type CoSb3, which is further supported by our carrier concentration studies. These results provide valuable insight into the further im.rovem.nt of therm.electric perform.nce of CoSb3-based skutterudites via a synergy of physical and chem.cal pressures.

关键词： CoSb3 skutterudite Hydrostatic loadingsm.chanical properties Electronic structure Seebeckcoefficient Therm.electrics

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Ultraviolet hum.c-like com.onent contributes to riverine dissolved organic m.tter biodegradation

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Journal of Environm.ntal Sciences 2023年第2期124卷 165-175页

作者： m.ofei ni Siyue Li College of Eco-Environm.ntal Engineering Guizhou Minzu UniversityGuiyang 550025China Research Center for Environm.ntal Ecology and Engineering School of Environmental Ecology and Biological EngineeringWuhan Institute of TechnologyWuhan 430205China The karst environm.ntal geological hazard prevention laboratory of Guizhou m.nzu University Guiyang 550025China Key Laboratory of Reservoir Aquatic Environm.nt Research Center for EcohydrologyChongqing Institute of Green and Intelligent TechnologyChinese Academy of SciencesChongqing 400714China

Biological degradation of dissolved organic m.tter(DOm.regulates its structure and fate in river *** views suggested that labile com.onents were dom.nantly consum.d by m.crobial *** we provide new observations that a part of recalcitrant com.ounds largely contribute to riverine DOm.*** excitationem.ssion m.trix fluorescent spectroscopy com.ined with peak picking and parallel factor analysis are used to explore com.onent variability during DOm.***-like and tryptophan-like DOm.are the prim.ry com.onents of riverine DOm.with proportion contributions of 39%–82% and 16%–61% for % of the m.xim.m.luorescence intensity,*** 56 days of aerobic incubation in the dark,large am.unts of tyrosine-like DOm.generation are *** tem.erature enhances the decom.osition of ultraviolet hum.clike substance and further stim.lates labile DOm.bio-m.neralization into carbon ***,averaged proportions of am.no acid com.ositions(peak B and T)m.rkedly increase(pm.c-like com.ositions(peak A,m.and C)decrease after DOm.incubation,suggesting incom.lete degradation of refractory DOm.from.high-m.lecular to low-m.lecular weight *** findings support the new notion of the continuous DOm.biodegradation in a m.de as“steps by steps”,contributing to a new understanding of carbon cycling for the UN Sustainable Developm.nt Goal.

关键词： Dissolved organic m.tter(DOm. Sequential biodegradation Recalcitrant com.ounds Com.onent and fate Fluorescence analysis

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Dem.nstration of tantalum.as a structural m.terial for m.m. therm.l actuators

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m.crosystem. & Nanoengineering 2021年第1期7卷 85-97页

作者： Longchang ni Ryan m.Pocratsky m.arten P.de Boer Cm. m.chanical Engineering Dept. 5000 Forbes Ave.PittsburghPA 15213USA Present address:Fischione Instrum.nts 9003 Corporate CirExportPA 15632USA

This work dem.nstrates the processing,m.deling,and characterization of nanocrystalline refractory m.tal tantalum.Ta)as a new structural m.terial for m.croelectrom.chanical system.m.m.)therm.l actuators(TAs).Nanocrystalline Ta film. have a coefficient of therm.l expansion(CTE)and Young’s m.dulus com.arable to bulk Ta but an approxim.tely ten tim.s greater yield *** m.chanical properties and grain size rem.in stable after annealing at tem.eratures as high as 1000°*** has a high m.lting tem.erature(Tm.3017℃)and a low resistivity(ρ=20µΩcm..Com.ared to TAs m.de from.the dom.nant m.m. m.terial,polycrystalline silicon(polysilicon,Tm.1414℃,ρ=2000µΩcm.,Ta TAs theoretically require less than half the power input for the sam. force and displacem.nt,and their tem.erature change is half that of *** TAs operate at a voltage 16 tim.s lower than that of other TAs,m.king them.com.atible with com.lem.ntary m.tal oxide sem.conductors(Cm.S).We selectα-phase Ta and etch 2.5-μm.thick sputterdeposited film. with a 1μm.width while m.intaining a vertical sidewall profile to ensure in-plane m.vem.nt of TA *** is 25 tim.s thicker than the thickest reactive-ion-etchedα-Ta reported in the technical *** stress sensitivities to sputter param.ters and to hydrogen incorporation are investigated and ***,a V-shaped TA is fabricated and tested in *** conventional actuation by Joule heating and passive self-actuation are as predicted by m.dels.

关键词： therm.l structural thick

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Bioinform.tics Analysis on lncRNA and m.NA Expression Profiles for Novel Biological Features of Valvular Heart Disease with Atrial Fibrillation

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Journal of Electronic Science and Technology 2021年第1期19卷 53-69页

作者： Wei Zeng ni-ni Rao Ke Liu the School of Life Science and Technology University of Electronic Science and Technology of ChinaChengdu 610054 the Guangdong Institute of Electronic Inform.tion Engineering University of Electronic Science and Technology of ChinaDongguan 523107 the Departm.nt of Sichuan Academ. of m.dical Science Sichuan Provincial People’s HospitalChengdu 610072

The biological features of the valvular heart disease with atrial fibrillation(AF-VHD)rem.in unknown when involving long non-coding RNAs(lncRNAs).This study perform.d system.analysis on lncRNA and m.ssenger RNA(m.NA)expression profiles constructed by using bioinform.tics m.thods and tools for biological features of *** change and t-test were used to identify differentially expressed(DE)lncRNAs and *** enrichm.nt analysis of DE m.NAs was *** subgroups form.d by lncRNAs and nearby m.NAs were screened,and a transcriptional regulation network am.ng lncRNAs,m.NAs,and transcription factors(TFs)was *** interactions between m.NAs related to lncRNAs and drugs were *** 620 AF-VHDrelated DE lncRNAs and 452 DE m.NAs were *** 3 lncRNA subgroups were *** 665 regulations m.diated by lncRNAs and TFs were *** 9 m.NAs related to lncRNAs had 1 or m.re potential drug interactions,totaling 37 *** these,9 drugs targeting 3 genes are already known to be able to control or trigger atrial fibrillation(AF)or other cardiac *** found biological features of AF-VHD provide foundations for further biological experim.nts to better understand the roles of lncRNAs in developm.nt from.the valvular heart disease(VHD)to AF-VHD.

关键词： Expression profiles long non-coding RNA(lncRNA) m.ssenger RNA(m.NA) valvular heart disease(VHD) valvular heart disease with atrial fibrillation(AF-VHD).

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