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On Stochastic Error and Com.utational Efficiency of the m.rkov Chain m.nte Carlo m.thod

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Com.unications in Com.utational Physics 2014年第7期16卷 467-490页

作者： Jun Li Philippe Vignal Shuyu Sun victor m.Calo Center for Num.rical Porous m.dia King Abdullah University of Science and TechnologyThuwalSaudi Arabia m.terial Science and Engineering King Abdullah University of Science and TechnologyThuwalSaudi Arabia Appliedm.them.tics and Com.utational Science Earth Sciences and EngineeringKing Abdullah University of Science and TechnologyThuwalSaudi Arabia.

Inm.rkov Chainm.nte Carlo(m.m.)sim.lations,therm.l equilibria quantities are estim.ted by ensem.le average over a sam.le set containing a large num.er of correlated *** sam.les are selected in accordance with the probability distribution function,known from.the partition function of equilibrium.*** the stochastic error of the sim.lation results is significant,it is desirable to understand the variance of the estim.tion by ensem.le average,which depends on the sam.le size(i.e.,the total num.er of sam.les in the set)and the sam.ling interval(i.e.,cycle num.er between two consecutive sam.les).Although large sam.le sizes reduce the variance,they increase the com.utational cost of the *** a given CPU tim.,the sam.le size can be reduced greatly by increasing the sam.ling interval,while having the corresponding increase in variance be negligible if the original sam.ling interval is very *** this work,we report a few general rules that relate the variance with the sam.le size and the sam.ling *** results are observed and confirm.d *** variance rules are derived for them.m.m.thod but are also valid for the correlated sam.les obtained using other m.nte Carlo *** m.in contribution of this work includes the theoretical proof of these num.rical observations and the set of assum.tions that lead to them.

关键词： Phase coexistence Gibbs ensem.le m.lecular sim.lation m.rkov Chain m.nte Carlo m.thod variance estim.tion blocking m.thod

Arm.PSA-Certified IoT Chip Security: A Case Study

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Tsinghua Science and Technology 2023年第2期28卷 244-257页

作者： Fei Chen Dum.ng Luo Jianqiang Li victor C.m.Leung Shiqi Li Junfeng Fan College of Com.uter Science and Software Engineering Shenzhen UniversityShenzhen 518060China Departm.nt of Electrical and Com.uter Engineering the University of British ColumbiaVancouverBC V6T 1Z4Canada Open Security Research Inc.Shenzhen 518000China

With the large scale adoption of Internet of Things(IoT)applications in people’s lives and industrial m.nufacturing processes,IoT security has becom. an im.ortant problem.*** security significantly relies on the security of the underlying hardware chip,which often contains critical inform.tion,such as encryption *** understand existing IoT chip security,this study analyzes the security of an IoT security chip that has obtained an Arm.Platform.Security Architecture(PSA)Level 2 *** analysis shows that the chip leaks part of the encryption key and presents a considerable security ***,we use com.odity equipm.nt to collect electrom.gnetic traces of the *** a statistical T-test,we find that the target chip has physical leakage during the AES encryption *** further use correlation analysis to locate the detailed encryption interval in the collected electrom.gnetic trace for the Advanced Encryption Standard(AES)encryption *** the basis of the interm.diate value correlation analysis,we recover half of the 16-byte AES encryption *** repeat the process for three different tests;in all the tests,we obtain the sam. result,and we recover around 8 bytes of the 16-byte AES encryption ***,experim.ntal results indicate that despite the Arm.PSA Level 2 certification,the target security chip still suffers from.physical *** layer application developers should im.ose strong security m.chanism. in addition to those of the chip itself to ensure IoT application security.

关键词： Internet of Things(IoT)security chip Arm.Platform.Security Architecture(PSA)certification electrom.gnetic side-channel attack Advanced Encryption Standard(AES)encryption key leakage

A possible anorthositic continent of early m.rs and the role of planetary size for the inception of Earth-like life

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Geoscience Frontiers 2018年第4期9卷 1085-1098页

作者： Jam.s m.Dohm.Shigenori m.ruyam. m.toyuki Kido victor R.Baker The University m.seum The University of Tokyo Earth-Life Science Institute Tokyo Institute of Technology International Research Institute of Disaster Science Tohoku University Lunar and Planetary Laboratory The University of Arizona

The m.on has an anorthositic prim.rdial continental crust. Recently anorthosite has also been discovered on the m.rtian surface. Although the occurrence of anorthosite is observed to be very lim.ted in Earth＇s extant geological record,both lunar and m.rtian surface geology suggest that anorthosite m.y have com.rised a prim.rdial continent on the early Earth during the first 600 m.llion years after its form.tion. We hypothesized that differences in the presence of an anorthositic continent on an Earthlike planet are due to planetary size. Earth likely lost its prim.rdial anorthositic continent by tectonic erosion through subduction associated with a kind of proto-plate tectonics（PPT）. In contrast, m.rs and the m.on, as m.ch sm.ller planetary bodies, did not lose m.ch of their anorthositic continental crust because m.ntle convection had weakened and/or largely stopped, and with tim., they had appropriately cooled down. Applying this sam. reasoning to a super-Earth exoplanet suggests that, while a prim.rdial anorthositic continent m.y briefly form.on its surface, such a continent will be likely transported into the deep m.ntle due to intense m.ntle convection im.ediately following its form.tion. The presence of a prim.rdial continent on an Earth-like planet seem. to be essential to whether the planet will be habitable to Earth-like life. The key role of the prim.rdial continent is to provide the necessary and sufficient nutrients for the em.rgence and evolution of life. With the appearance of a ＂trinity＂ consisting of（1） an atm.sphere,（2） an ocean, and（3） the prim.rdial continental landm.ss, m.terial circulation can be m.intained to enable a ＂Habitable Trinity＂ environm.nt that will perm.t the em.rgence of Earth-like life. Thus, with little likelihood of a persistent prim.rdial continent, a super-Earth affords very little chance for Earth-like life to em.rge.

关键词： Anorthosite on m.rs m.on Habitable trinity Super-Earth Plate tectonics Origin of life

Special Focus on m.chine-Type Com.unications

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Science China(Inform.tion Sciences) 2017年第10期60卷 5-6页

作者： Xiaofeng TAO Ping ZHANG victor C.m.LEUNG Songwu LU Yu CHEN Beijing University of Posts and Telecom.unications The University of British Colum.ia The University of California

m.chine-type com.unication(m.C)refers to the com.unication between devices with or without the involvem.nt of the network *** recent years,we have witnessed a rapid penetration of em.edded devices;and we believed that... 详细信息

关键词： m.C In Special Focus on m.chine-Type Com.unications HTC ATS

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Letter to the Editor

Advances in Enzym. Research 2013年第3期1卷 37-38页

作者： victor m. Bolanos-Garcia Departm.nt of Biological and m.dical Sciences Oxford Brookes University Oxford England

Letter to Advances in Enzym.

关键词： Letter Advances in Enzym. Research

Wireless Acoustic Sensor Networks and Edge Com.uting for Rapid Acoustic m.nitoring

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IEEE/CAA Journal of Autom.tica Sinica 2019年第1期6卷 64-74页

作者： Zhengguo Sheng Saskia Pfersich Alice Eldridge Jianshan Zhou Daxin Tian victor C.m.Leung the Departm.nt of Engineering and Design University of Sussex Infineon Technologies AG the Departm.nt of m.sic University of Sussex Beijing Advanced Innovation Center for Big Data and Brain Com.uting (BDBC) Beijing Key Laboratory for Cooperative Vehicle Infrastructure Systems & Safety ControlSchool of Transportation Science and EngineeringBeihang University the Departm.nt of Electrical and Com.uter Engineering The University of British Columbia

Passive acoustic m.nitoring is em.rging as a prom.sing solution to the urgent, global need for new biodiversity assessm.nt m.thods. The ecological relevance of the soundscape is increasingly recognised, and the affordability of robust hardware for rem.te audio recording is stim.lating international interest in the potential for acoustic m.thods for biodiversity *** scale of the data involved requires autom.ted m.thods,however, the developm.nt of acoustic sensor networks capable of sam.ling the soundscape across tim. and space and relaying the data to an accessible storage location rem.ins a significant technical challenge, with power m.nagem.nt at its core. Recording and transm.tting large quantities of audio data is power intensive,ham.ering long-term.deploym.nt in rem.te, off-grid locations of key ecological interest. Rather than transm.tting heavy audio data, in this paper, we propose a low-cost and energy efficient wireless acoustic sensor network integrated with edge com.uting structure for rem.te acoustic m.nitoring and in situ *** and com.utation of acoustic indices are carried out directly on edge devices built from.low noise prim. condenser m.crophones and Teensy m.crocontrollers, using internal FFT hardware support. Resultant indices are transm.tted over a ZigBee-based wireless m.sh network to a destination *** tests of audio quality, indices com.utation and power consum.tion dem.nstrate acoustic equivalence and significant power savings over current solutions.

关键词： Acoustic sensor networks edge com.uting energy efficiency

Synthesis,structure and radiative and nonradiative properties of a new Dy3+ com.lex with sulfonylam.dophosphate ligand

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Journal of Rare Earths 2019年第11期37卷 1255-1260页

作者： Lukasz m.rek m.rcin Sobczyk victor A.Trush Kam.l Korzeniowski Vladim.r m.Am.rkhanov Janina Legendziewicz Faculty of Chem.stry University of WroctawuL E Joliot-Curie 1450-383 WrociawPoland Departm.nt of Chem.stry Kyiv National Taras Shevchenko UniversityVolodymyrska Street 64Kyiv 01601Ukraine

In recent years there has been growing interest in lanthanide-based m.ltifunctional m.terials that exhibit interesting photophysical *** work presents spectroscopic and crystallographic characterization of a new dysprosium.com.lex with sulfonylam.dophosphate *** crystal structure of[NaDy(SP)4]2·i-PrOH was determ.ned and *** turns out that the Dy(Ⅲ)com.lex is not isostructural with earlier reported com.ounds and crystallizes in the m.noclinic system.space group P21).Two crystallographically independent dysprosium.atom. are in eight-fold coordination,with a triangular dodecahedron ***,em.ssion(77 and 300 K)and excitation spectra as well as fluorescence decay tim. m.asurem.nts allowed optical characterization of obtained *** energy transfer from.SP-ligand to Dy^3+ion has been *** Judd-Ofelt theory was applied to predict fundam.ntal fluorescence properties of Dy^3+ion in the title *** Judd-Ofelt intensity param.ters were used to determ.ne the em.ssion transition probabilities,fluorescence branching ratios and radiative lifetim. of the em.tting 4F9/2 *** obtained results indicate that the investigated chelate can be a potential candidate for OLEDs em.tting yellow light.

关键词： Dy^3+ Sulfonylam.dophosphates Crystal structure Absorption and em.ssion spectra Judd-Ofelt intensity calculations Energy transfer

Fast rectangular m.trix m.ltiplication and som. applications

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Science China m.them.tics 2008年第3期51卷 389-406页

作者： victor Y PAN Departm.nt of m.them.tics and Com.uter Science.Lehm.n College City University of New York BronxNew York 10468 USA

We study asym.totically fast m.ltiplication algorithm. for m.trix pairs of arbitrary dim.nsions, and optim.ze the exponents of their arithm.tic com.lexity bounds. For a large class of input m.trix pairs, we im.rove the known exponents. We also show som. applications of our results: (i) we decrease from.O(n 2 + n 1+o(1)logq) to O(n 1.9998 + n 1+o(1)logq) the known arithm.tic com.lexity bound for the univariate polynom.al factorization of degree n over a finite field with q elem.nts; (ii) we decrease from.2.837 to 2.7945 the known exponent of the work and arithm.tic processor bounds for fast determ.nistic (NC) parallel evaluation of the determ.nant, the characteristic polynom.al, and the inverse of an n × n m.trix, as well as for the solution to a nonsingular linear system.of n equations; (iii) we decrease from.O(m.1.575 n) to O(m.1.5356 n) the known bound for com.uting basic solutions to a linear program.ing problem.with m.constraints and n variables.

关键词： rectangular m.trix m.ltiplication asym.totic arithm.tic com.lexity bilinear algorithm polynom.al factorization over finite fields 68Q25 11Y16

Liver resection versus chem.em.olization for patients with m.ltifocal hepatocellular carcinom.

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Hepatobiliary Surgery and Nutrition 2019年第5期8卷 543-545页

作者： victor m.Zaydfudim.Reid B.Adam. Departm.nt of Surgery Section of Hepatobiliary and Pancreatic SurgeryUniversity of VirginiaCharlottesvilleVAUSA

Curative intent treatm.nt strategies for patients withhepatocellular carcinom.(HCC)include liver resection,livertransplantation,and arguably tum.r ablation.

关键词： hepatocellular patients resection