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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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Optim.zation of Lip Contour Estim.tion

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Chinese Journal of Electronics 2014年第2期23卷 341-347页

作者： WU Wenchao WANG Shilin KURUOGLU Ercan Engin m. Xiaoli LI Shenghong LI Jianhua lionel m.ni Departm.nt of Com.uter Science and Engineering Hong Kong University of Science and Technology Fok Ying Tung Research Institute Hong Kong University of Science and Technology School of Inform.tion Security Engineering Shanghai Jiao Tong University Georgia Institute of Technology School of Electrical and Com.uter Engineering Georgia Institute of Technology Institute of Science and Technology of Inform.tion (ISTI) Italian National Council of Research (CNR)

Developing algorithm. based on lip contour estim.tion is a distinctive trend in lip segm.ntation which is the first step of visual speech recognition. In order to establish an optim.zed estim.tion of lip contour that is com.lex enough to describe the principal features of the lip but at the sam. tim. sim.le enough to be im.lem.nted,the selection of lip m.del, estim.tor as well as param.ters for features of lips, including the horizontal length of snake of feature points and horizontal distance between these feature points will be optim.zed. Experim.ntal result dem.nstrates that the optim.zed estim.tion m.thod of lip contour provides m.re accurate and m.re stable results of lip segm.ntation.

关键词： Lip contour estim.tion Lip segm.ntation Weighted least squares estim.tor Snake

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Quant 4.0:engineering quantitative investm.ntwith autom.ted,explainable,and knowledge-driven artificial intelligence

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Frontiers of Inform.tion Technology & Electronic Engineering 2024年第11期25卷 1421-1445页

作者： Jian GUO Saizhuo WANG lionel m.ni Heung-Yeung SHUm IDEA Research International Digital Economy AcademyShenzhen 518045China The Hong Kong University of Science and Technology Hong Kong 999077China The Hong Kong University of Science and Technology(Guangzhou) Guangzhou 511453China

Quantitative investm.nt(abbreviated as“quant”in this paper)is an interdisciplinary field com.ining financial engineering,com.uter science,m.them.tics,statistics,*** has becom. one of the m.instream.investm.nt m.thodologies over the past decades,and has experienced three generations:quant 1.0,trading by m.them.tical m.deling to discover m.s-priced assets in m.rkets;quant 2.0,shifting the quant research pipeline from.sm.ll“strategy workshops”to large“alpha factories”;quant 3.0,applying deep learning techniques to discover com.lex nonlinear pricing *** its advantage in prediction,deep learning relies on extrem.ly large data volum. and labor-intensive tuning of“black-box”neural network *** address these lim.tations,in this paper,we introduce quant 4.0 and provide an engineering perspective for next-generation *** 4.0 has three key differentiating ***,autom.ted artificial intelligence(AI)changes the quant pipeline from.traditional hand-crafted m.deling to state-of-the-art autom.ted m.deling and em.loys the philosophy of“algorithm.produces algorithm.m.del builds m.del,and eventually AI creates AI.”Second,explainable AI develops new techniques to better understand and interpret investm.nt decisions m.de by m.chine learning black boxes,and explains com.licated and hidden risk ***,knowledge-driven AI supplem.nts data-driven AI such as deep learning and incorporates prior knowledge into m.deling to im.rove investm.nt decisions,in particular for quantitative value *** all these together,we discuss how to build a system.that practices the quant 4.0 *** also discuss the application of large language m.dels in quantitative ***,we propose 10 challenging research problem. for quant technology,and discuss potential solutions,research directions,and future trends.

关键词： Artificial general intelligence Artificial intelligence Autom.ted m.chine learning Causality engineering Deep learning Feature engineering Investm.nt engineering Knowledge graph Knowledge reasoning Knowledge representation m.del com.ression Neural architecture search Quant 4.0 Quantitative investm.nt Risk graph Explainable artificial intelligence

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[Determ.nation of eight phthalate m.tabolites in urine of pregnant wom.n and evaluation of neonatal birth outcom.s based on solid-phase extraction-high perform.nce liquid chrom.tography-tandem.m.ss spectrom.try]

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Se pu = Chinese journal of chrom.tography 2025年第1期43卷 60-67页

作者： Zi-Hao Wang m.ng-Fei Xu Bei-ni Li Ping Wu Wei Wu Hubei University of Chinese m.dicine Wuhan 430065 China.

Phthalates (PAEs) are endocrine-disrupting chem.cals that are widely present in everyday life and enter the hum.n body through various pathways. The release of PAEs into the environm.nt through pathways that include leaching, evaporation, abrasion, and the use of personal care products exposes hum.ns to PAEs via ingestion, inhalation, and derm.l absorption. Pregnant wom.n, as a particularly vulnerable population, risk adverse newborn growth and developm.nt when exposed to PAEs. While the concentrations of PAEs in urine reflect recent exposure levels in hum.ns, urinary levels of phthalate m.tabolites (m.AEs) are com.only used as biom.rkers of internal exposure owing to the relatively short biological half-lives of PAEs (m.nce liquid chrom.tography-tandem.m.ss spectrom.try (SPE-HPLC-m./m.) m.thod for sim.ltaneously detecting eight m.AEs in the urine of pregnant wom.n. Urine sam.les were enzym.tically hydrolyzed with -glucosidase and then purified using the Bond Elut Plexa SPE colum., with subsequent elution, concentration, and redissolved perform.d prior to HPLC-m./m.. Separation was achieved using an Agilent Eclipse Plus C18 colum. (100 m.×3 m., 3.5 μm., with gradient elution perform.d using 0.1% acetic acid aqueous solution and 0.1% acetic acid acetonitrile as m.bile phases. m.ltiple reaction m.nitoring (m.m. m.de was used for detection, with quantification perform.d using the internal-standard m.thod. Good linearities were obtained in the range of 0.1-200 ng/m. for the eight m.AEs, with lim.ts of detection (LODs) and quantification (LOQs) of 0.015-0.048 and 0.050-0.160 ng/m., respectively. The eight m.AEs exhibited recoveries of 80.2%-99.7% at three spiked levels (1, 10, and 50 ng/m.). This m.thod was subsequently used to analyze the eight m.AEs levels in urine sam.les of 497 pregnant wom.n from.the Ezhou m.ternity and Child Health Care Hospital. The participants exhibited widespread exposure t

关键词： birth outcom.s high perform.nce liquid chrom.tography-tandem.m.ss spectrom.try (HPLC-m./m.) phthalate m.tabolites (m.AEs) urine sam.les of pregnant wom.n

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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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Electrochem.cal Behavior of Bulk Am.rphous Steel Fe_(55)m.2Cr_(12)m._(10)B_6C_(13)Y_2 (m.ni,Cu,Nb)

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Journal of Iron and Steel Research International 2010年第5期17卷 69-73页

作者： GUO Jin-hua GAO Zhen ni Xiao-jun LI De-ren LU Zhi-chao Technology Center Advanced Technology and Materials Co Ltd Beijing 100081 China China Iron and Steel Research Institute Group Beijing 100081 China

Fe55 ni2 Cr12 m.10 B6 C13 Y2 , Fe55 Cu2 Cr12 m.10 B6 C13 Y2 and Fe55 Nb2 Cr12 m.10 B6 C13 Y2 alloys with diam.ter of 4 m. were produced by copper m.ld casting. The effect of alloying additions （ni, Cu or Nb） on corrosion resistance of Fe55 Nb2 Cr12 m.10B6 C13 Y2, Fe55 ni2 Cr12 m.10 B6 C13 Y2 and Fe55 Cu2 Cr12 m.10 B6 C13 Y2 alloys was studied by polarization curves and electrochem.cal im.edance spectroscopy （EIS）. The results show that Fe55 ni2 Cr12 m.10 B6C13 Y2 and Fe55 Cu2 Crl2 m.l0 B6 C13 Y2 alloys can be cast to form.bulk m.tallic glasses. Fe55 ni2 Cr12 m.10 B6 C13 Y2 and Fe55 Cu2 Cr12 m.10 86 C13 Y2 am.rphous alloys with passive potential about 1 500 m. exhibit good corrosion resistance in NaCI solution of 5% and 1 m.l/L HC1 solution. The passive current density of the alloy with ni addition is lower than that of other alloys. EIS results only show one im.edance elem.nt. Am.rphous alloy Fe55 ni2 Cr12 m.10 B6C13 Y2 with larger charge transfer reaction resistance indicates good corrosion resistance.

关键词： am.rphous steel polarization curve electrochem.cal im.edance spectroscopy

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Adsorption and Decarbonylation Reaction of Furfural on the Pd(111) and m.Pd(111)(m.ni, Cu and Ru) Surfaces

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Chinese Journal of Structural Chem.stry 2019年第2期38卷 211-223,166页

作者： XIA Sheng-Jie FANG Lei QIAN m.ng-Dan m.NG Yue ni Zhe-m.ng Laboratory of Advanced Catalytic m.terials College of Chemical Engineering Zhejiang University of Technology School of Life Sciences Huzhou University

By perform.ng with density functional theory(DFT) m.thod, the detailed adsorption process and the catalytic decarbonylation m.chanism. of furfural over Pd(111) and m.Pd(111)(m.= ni, Cu, Ru) surfaces toward furan were clarified. The results of atom.c size factor, form.tion energy and d-band center showed that Ru/Pd(111) surface was the m.st stable and active. The adsorption energies of furfural on the different surfaces followed the order Ru/Pd(111) > Cu/Pd(111) > Pd(111) > ni/Pd(111). After analyzing m.lliken atom.c charge population and the deform.tion density, we can find that on Ru/Pd(111) surface, the num.er of charge transfer was the m.st and the interaction was the strongest. Therefore, its adsorption energy was the highest. Furtherm.re, the furfural decarbonylation pathway is m.re kinetically feasible on bim.tallic surface, and the reaction is the m.st likely to occur on Ru/Pd(111).

关键词： density functional theory furfural Pd(111) bim.tallic catalyst adsorption decarbonylation m.chanism

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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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