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A general communication performance evaluation model based on routing path decomposition

Journal of zhejiang university-Science C(Computers and Electronics) 2011年第7期12卷 561-573页

作者： Ai-lian CHENG 1,Yun PAN 1,2.Xiao-lang YAN 2.Ruo-hong HUAN 3 (1 department of Information Science and Electronic Engineering,zhejiang {2.,hangzhou 31002.,China) (2.Institute of VLSI Design,zhejiang {2.,hangzhou 31002.,China) (3 College of Computer Science and Technology,zhejiang {2. of Technology,hangzhou 31002.,China) department of Information Science and Electronic Engineering Zhejiang University Institute of VLSI Design Zhejiang University

The network-on-chip (NoC) architecture is a main factor affecting the system performance of complicated multi-processor systems-on-chips (MPSoCs).To evaluate the effects of the NoC architectures on communication efficiency,several kinds of techniques have been developed,including various simulators and analytical *** simulators are accurate but time consuming,especially in large space explorations of diverse network configurations;in contrast,the analytical models are fast and flexible,providing alternative methods for performance *** this paper,we propose a general analytical model to esti-mate the communication performance for arbitrary NoCs with wormhole routing and virtual channel flow *** resolve the inherent dependency of successive links occupied by one packet in wormhole routing,we propose the routing path decomposition approach to generating a series of ordered link *** we use the traditional queuing system to derive the fine-grained transmission latency for each network *** to our experiments,the proposed analytical model provides a good approximation of the average packet latency to the simulation results,and estimates the network throughput precisely under various NoC configurations and ***,the analytical model runs about 10 5 times faster than the cycle-accurate NoC *** applications of the model including bottleneck detection and virtual channel allocation are also presented.

关键词： Analytical model Communication performance Network-on-chip (NoC) Queuing system Routing path decom-position Virtual channel

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On the Notion of Cobordism for Bounded Manifolds

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Acta Mathematica Sinica,English Series 1994年第1期10卷 59-63页

作者： Gan Danyan department of mathematics{2. hangzhou,31002. China 1. department of mathematics Zhejiang University 310027 Hangzhou China

The usual concept of eobordism is concerned with closed *** this paper, we generalise the concept of cobordism to the extent of bouncded manifolds and obtain a homotopy theorem similar to the theorem of Thom.

关键词： On the Notion of Cobordism for Bounded Manifolds

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A maximum principle for optimal control problem of fully coupled forward-backward stochastic systems with partial information

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Science China mathematics 2009年第7期52卷 1579-1588页

作者： MENG QingXin1,2.1 department of Mathematical Sciences,Huzhou university,{2. 313000,China 2.Institute of mathematics,Fudan university,Shanghai 2.0433,China 1. department of Mathematical Sciences Huzhou University Zhejiang 313000 China 2. Institute of mathematics Fudan University Shanghai 200433 China

The paper is concerned with a stochastic optimal control problem in which the controlled system is described by a fully coupled nonlinear forward-backward stochastic differential equation driven by a Brownian *** is required that all admissible control processes are adapted to a given subfiltration of the filtration generated by the underlying Brownian *** this type of partial information control,one sufficient(a verification theorem) and one necessary conditions of optimality are *** control domain need to be convex and the forward diffusion coefficient of the system can contain the control variable.

关键词： maximum principle stochastic optimal control partial information 93E2. 60H10 60H30

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Notifiable infectious disease surveillance with data collected by search engine

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Journal of zhejiang university-Science C(Computers and Electronics) 2010年第4期11卷 241-248页

作者： Xi-chuan ZHOU1,Hai-bin SHEN2.(1department of Information Science and Electronic Engineering,zhejiang {2.,hangzhou 31002.,China) (2.chool of Electrical Engineering,zhejiang {2.,hangzhou 31002.,China) department of Information Science and Electronic Engineering Zhejiang University Hangzhou China School of Electrical Engineering Zhejiang University Hangzhou China

Notifiable infectious diseases are a major public health concern in China,causing about five million illnesses and twelve thousand deaths every *** detection of disease activity,when followed by a rapid response,can reduce both social and medical impact of the *** aim to improve early detection by monitoring health-seeking behavior and disease-related news over the ***,we counted unique search queries submitted to the Baidu search engine in 2.08 that contained disease-related search *** we counted the news articles aggregated by Baidu's robot programs that contained disease-related *** found that the search frequency data and the news count data both have distinct temporal association with disease *** adopted a linear model and used searches and news with 1–2.0-day lead time as explanatory variables to predict the number of infections and deaths attributable to four notifiable infectious diseases,i.e.,scarlet fever,dysentery,AIDS,and *** the search frequency data and news count data,our approach can quantitatively estimate up-to-date epidemic trends 10–40 days ahead of the release of Chinese Centers for Disease Control and Prevention(Chinese CDC)*** approach may provide an additional tool for notifiable infectious disease surveillance.

关键词： Notifiable infectious diseases Disease surveillance Search engine

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Two conceptual models of displacement transfer and examples

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Science China Earth Sciences 2005年第7期48卷 900-911页

作者： GUAN Shuwei1,2. WANG Xin2. YANG Shufeng2. HE Dengfa1 & ZHAO Weidong3 1. Research Institute of Petroleum Exploration and Development, Beijing 100083, China 2. department of Geosciences, zhejiang university,{2., China 3. Tarim Oilfield Company, Korla 841000, China Research Institute of Petroleum Exploration and Development Beijing 100083 China department of Geosciences Zhejiang University Hangzhou 310027 China Tarim Oilfield Company Korla 841000 China

This paper presents two conceptual models of displacement transfer, reverse sym- metry model and infinitely equal division model, based on the fault-bend folding theory. If the fault shape is held constant in the trend, then the distribution of slip magnitude, geometry of imbricate structures and its axial surface map all display reverse symmetry on the process of displacement transfer, as called reverse symmetry model in this paper. However, if the ramp height of thrust fault decreases gradually along its strike, the displacement is postulated to be equally and infinitely divided to every thrust that is formed subsequently, this kinematic process is described using infinitely equal division model. In both models, displacement transfer is characterized by the regular changes of imbricate thrusting in the trend. Geometric analysis indicates that the displacement transfer grads can be estimated using the tangent of deflective angle of hinterland structures. Displacement transfer is often responsible for the distortion and branching of the surface anticlines, especially in the region where the multi-level detachment structures is developed. We also present some examples from the frontal structures of the Southern Tianshan fold-and-thrust belt, Xinjiang, China. Displacement transfer between deep imbricate thrusts in the middle segment of Qiulitag anticline zone causes the Kuqatawu and Southern Qiulitag deep an- ticlines left-lateral echelon. The region, where these two deep anticlines overlap, is characterized by duplex structures, and extends about 18 km. The shallow anticline is migrated southward displaying obvious “S” form in this area.

关键词： displacement transfer fault-bend folding reverse symmetry model infinitely equal division model Qiulitag zone.

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Paleomagnetic results of the Cretaceous marine sediments in Tongyouluke, southwest Tarim

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Science China Earth Sciences 2005年第3期48卷 406-416页

作者： SHEN Zhongyue1, CHEN Hanlin1, FANG Dajun1, DING Jinghai1, ZHANG Shiben2. HUANG Zhibin2.& LI Meng2.1. department of Earth Sciences, zhejiang university,{2. China 2. Tarim Oil Field Company, PetroChina Company Limited, Korla 830011, China 1. department of Earth Sciences Zhejiang University 310027 Hangzhou China 2. Tarim Oil Field Company PetroChina Company Limited 830011 Korla China

Paleomagnetic and rock magnetic studies on samples of 18 sites from the Creta- ceous marine sedimentary rocks in the Tongyouluke section, Akto County, southwest Tarim, China show that the magnetic carriers of the Lower Cretaceous are dominated by hematite with some magnetite, while the magnetic carriers of the Upper Cretaceous are characterized by a combination of magnetite and titanomagnetite as well as hematite and goethite. Stepwise thermal demagnetization is performed and vector analysis is used to isolate magnetic components, which illustrates a single magnetic component or double magnetic components. The high temperature stable components are dual polarities and pass polarity test, reversal test and consistency test. The overall mean direction of the Lower Cretaceous is D = 2..0°, I = 42.0°, α95=6.5° with pole position at φ = 190.3°, λ=63.1°, dp=4.9°, dm=8.0°. The overall mean direction of the Upper Cretaceous is D = 2..1°, I = 39.4°, α95=11.2. with pole position at φ =190.9°, λ=60.3°, dp= 8.0°, dm=13.4°. Compared with the inclination of the Early Cretaceous from red beds of north Tarim, the contemporary inclination of southwest Tarim is 10.0°±7.8° sharper, but it is still 8.1° ±8.9°, shallower than that of Early Cretaceous basalts in southwest Tarim. Although these pa- leomagnetic data show slightly larger confidence limit, the paleolatitude of the marine Cretaceous tends to lie between that of terrestrial red beds and volcanic rocks.

关键词： Tarim paleomagnetism, Cretaceous, magnetic inclination, red beds, marine sedimentary rock.

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Theoretical model of particle orientation distribution function in a cylindrical particle suspension subject to turbulent shear flow

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Progress in Natural Science:Materials International 2006年第1期16卷 16-20页

作者： ZHANG Lingxin1, LIN Jianzhong1and ZHANG Weifeng 2.1.department of Mechanics, State Key Laboratory of Fluid Power Transmission and Control, zhejiang university,{2., China 2. Institute of Marine and Coastal Sciences, Rutgers university, New Brunswick, New Jersey, USA) [a]department of Mechanics State Key Laboratory of Fluid Power Transmission and Control Zhejiang University Hangzhou China [b]Institute of Marine and Coastal Sciences Rutgers University' New Brunswick New Jersey USA

The equation for the orientation probability function of slender cylindrical particles suspended in planar turbulent flows was investigated. After ensemble averaging, the equations for the mean and fluctuating probability function were derived. The equation for the fluctuating probability function appearing in the equation of mean probability function was solved by using the method of characteristics analysis. The orientational dispersion terms due to the random motion of cylindrical particles in the equation of mean probability function are related to the mean probability function and the Lagrangian fluid velocity correlations. The evolution of the mean probability function was described by a modified oriental ion-space-convection equation, where the dispersion terms account for the randomizing effect of the turbulence.

关键词： dispersion cylindrical particle suspensions turbulent flow probability function.

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Two-dimensional thermoelasticity solution for functionally graded thick beams

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Science China(Physics,Mechanics & Astronomy) 2006年第4期49卷 451-460页

作者： Lü Chaofeng1, CHEN Weiqiu1 & ZHONG Zheng2.1. department of Civil Engineering, zhejiang university,{2., China 2. Key Laboratory of Solid Mechanics of Ministry of Education, School of Aerospace Engineering and Ap- plied Mechanics, Tongji university, Shanghai 2.0092. China department of Civil Engineering Zhejiang University Hangzhou 310027 China Key Laboratory of Solid Mechanics of Ministry of Education School of Aerospace Engineering Applied Mechanics Tongji University Shanghai 200092 China

Two-dimensional thermoelasticity analysis of functionally graded thick beams is presented using the state space method coupled with the technique of differential quadrature. Material properties vary continuously and smoothly through the beam thickness, leading to variable coefficients in the state equation derived from the elasticity equations. Approximate laminate model is employed to translate the state equation into the one with constant coefficients in each layer. To avoid numerical instability, joint coupling matrices are introduced according to the continuity conditions at interfaces in the approximate model. The differential quadrature procedure is applied to discretizing the beam in the axial direction to make easy the treatment of arbitrary end conditions. A simply-supported beam with exponentially varying material properties is considered to validate the present method. Numerical examples are performed to investigate the influences of relative parameters.

关键词： state equation differential quadrature approximate laminate model joint coupling matrices thermal stresses.

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The G Class of Functions and Its Applications

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Acta Mathematica Sinica,English Series 2000年第3期16卷 455-468页

作者： Shenghong Li department of mathematics,{2. university,hangzhou,31002.,P.R.ChinaXiangao Liu department of mathematics,Fudan university,Shanghai,2.0433,P.R.China department of mathematics Zhejiang University Hangzhou 310027 P. R. China department of mathematics Fudan University Shanghai 200433 P. R. China

In this paper,we introduce the concept of the G class of functions of the parabolic class, and show the Hlder continuity of the G class of *** introduction *** concept contributes to the proof of the regularity and ex... 详细信息

关键词： Parabolic equation Regularity and existence G class of functions

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Synthesis of a novel perylene diimide derivative and its charge transfer interaction with C_(60)

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Science China Chemistry 2008年第2期51卷 152-157页

作者： LIU Bo1,2. SHI MinMin1,2. YANG LiGong1,2. CHEN HongZheng1,2.& WANG Mang1,2.1 State Key Lab of Silicon Materials, department of Polymer Science and Engineering, zhejiang university,{2., China 2.Key Laboratory of Macromolecule Synthesis and Functionalization of Ministry of Education, zhejiang university,{2., China 1. State Key Lab of Silicon Materials Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 China 2. Key Laboratory of Macromolecule Synthesis and Functionalization of Ministry of Education Zhejiang University Hangzhou 310027 China

A novel organic electron acceptor, N,N′-dipyrimidinyl-3,4,9,10-perylene-tetracarboxylic diimide (DMP), was designed and synthesized. The molecular structure was characterized by FTIR spectrum and elemental analysis. By cyclic voltammetry measurements, DMP was found to possess a lower LUMO energy level than N,N′-diphenyl-3,4,9,10-perylene-tetracarboxylic diimide due to the stronger electron-withdrawing pyrimidinyl group than the phenyl group. Fluorescence quenching is observed in a dual-layer film consisting of a DMP layer and a C60 layer and was attributed to the charge transfer at the interface due to the energy level offset between DMP and C60.

关键词： perylene diimide LUMO charge transfer fluorescence quenching

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