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OCEANS - Europe

作者： S. Tomkratoke S. Sirisup Large-Scale Simulation Research Laboratory National Electronics and Computer Technology Center Klong Luang Pathum Thani Thailand

The Sunda Shelf is settled in Southeast Asia where it forms a large submerged extension of the continental shelf of mainland Asia. The Sunda shelf includes the Greater Sunda Islands of Borneo, Java and Sumatra and the bulk of the shelf forms the shallow seabed of the South China Sea, the coastal areas of Cambodia, Malaysia Peninsula, Singapore, Borneo, and parts of the coast of Indonesia, Thailand, and Vietnam. This shelf is characterized by complex shoreline and seafloor topography which can result in complicated tidal characteristics. In this work, we aim to gain insightful understanding of mechanism of the tidal wave propagation in this region. To achieve this, we perform simulation with high fidelity for the Gulf of Thailand and nearby areas. The high fidelity includes high resolution bathymetry (30 seconds), finer scale capturing and ability to preserve the realistic, complex coastline and islands. To this end, we employ the finite volume method in our simulation for its geometric flexibility, computational efficiency as well as volume and mass conservation assurance. In the current study, we focus mainly on the tidal dynamic processes in the Sunda shelf region, and we numerically scrutinize exact amphidromic systems as well as the corresponding energy flux of the principal tides (M 2 , K 1 , S 2 and O 1 ) in the Sunda shelf of the South China Sea. Comparisons to other numerical and experimental observations have been done.

关键词： Tides Solid modeling Mathematical model Clocks Sea measurements Computational modeling Surfaces

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NAP: An Agent-Based Scheme on Reducing Churn-Induced Delays for P2P Live Streaming

NAP: An Agent-Based Scheme on Reducing Churn-Induced Delays ...

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International Conference on Peer-to-Peer Computing

作者： F. Huang B. Ravindran M. Khan Network Dynamics and Simulation Science Laboratory Virginia Bioinformatics Institute Virginia Technology Blacksburg VA USA Department of Electrical & Computer Engineering Virginia Technology Blacksburg VA USA

Peer-to-peer (P2P) multimedia streaming provides a scalable solution for IPTV. However, delays from channel switch and streaming recovery are typically in the scale of 10-60 seconds, which have hindered the extensive commercial deployment of P2P systems. We call these two types of delays, churn-induced delays. Obtaining assurances on churn-induced delays in dynamic and heterogeneous network environments is a challenge. In this paper, we devise a simple, yet efficient agent-based P2P streaming scheme, called NAP, which reduces churn-induced delays. We first formulate the problems of minimizing channel-switching delay and streaming recovery delay. We then present the detailed methodology of NAP. In addition, we develop a queuing model for the P2P streaming scenario and analyze the properties of NAP based on this model. Our numerical study reveals the effectiveness of NAP, and shows that NAP significantly reduces churn-induced delays, especially channel-switching delays.

关键词： Delay Peer to peer computing Switches Bandwidth Queueing analysis Numerical models Analytical models

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Notice of Retraction: Research on the solution method of Braess paradox based on Multi-agent system

Notice of Retraction: Research on the solution method of Bra...

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International Conference on computer Science and Information technology (CSIT)

作者： Peng Gao Zhaosheng Yang Di Hong College of Traffic and Transportation & State Key Laboratory of Automobile Dynamic Simulation Jilin University Changchun Jilin China College of Computer Science and Technology Jilin University Changchun Jilin China

This article has been retracted by the publisher.

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Model-based functional safety analysis method for automotive embedded system application

Model-based functional safety analysis method for automotive...

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International Conference on Intelligent Control and Information Processing (ICICIP)

作者： Hongkun Zhang Wenjun Li Jun Qin State Key Laboratory of Automotive Dynamic Simulation Jilin University Changchun China College of Traffic Jilin University Changchun China College of Computer Science and Technology Jilin University Changchun China

Increasing functionality and complexity of automotive embedded system have led to more risks from systematic faults and random hardware faults. This makes it necessary to perform the functional safety process throughout the safety lifecycle of these systems. In addition, the appearance of the new functional safety standard ISO 26262 also make the consideration of functional safety as part of the design and implementation process for these systems is growing in importance. This paper presents a comprehensive functional safety analysis approach based on functional model. The process of functional modeling and safety analysis is outlined and the comprehensive functional safety analysis approach is applied to Dual Clutch Transmission (DCT) control system and the analysis results are integrated. A method for the automotive safety integrity level (ASIL) determination is put forward based on severity, probability of exposure and controllability.

关键词： Discrete cosine transforms Analytical models Hazards Mathematical model Fault trees Control systems

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Estimation of distribution algorithm based on nested Archimedean copulas constructed with Lévy subordinators

Estimation of distribution algorithm based on nested Archime...

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International Conference on computer-Aided Industrial Design and Conceptual Design, CAIDCD

作者： Baolin Huimin Xiaoping Jianchao Div. of System Simulation&Computer Application Taiyuan University of Science and Technology Taiyuan China Illinois Genetic Algorithms Laboratory University of Illinois at Urbana-Champaign Urbana IL USA

This paper proposes an improved estimation of distribution algorithm(EDA) based on a class of nested Archimedean copulas which is constructed with Lévy subordinators(LNAcopula-EDA). Utilizing of Lévy subordinators, a class of nested Archimedean copulas has been conveniently constructed. In order to exploit EDA to solve high-dimensional continuous optimization problem, we fully use of the capability of nested Archimedean copula in modeling high-dimensional joint distribution of multivariate with complex rank correlation structure to construct the probability distribution model of promising individuals in EDA. Then, the procedure of LNAcopula-EDA has been presented. And comparing with other EDAs that based on copula functions for the benchmark functions in the experiments, the obtained results demonstrated the effectiveness of the proposed algorithm.

关键词： Probability distribution Generators Estimation Joints Random variables Evolutionary computation Probabilistic logic

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Investigations on control algorithm of steady-state cornering and control strategy for dynamical correction in a steer-by-wire system

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第6期10卷 900-908页

作者： Ying XU Chang-fu ZONG Hsiao-hsiang NA Lei LIU Department of Computer Science and Technology Jilin University Changchun 130025 China State Key Laboratory of Automobile Dynamic Simulation Jilin University Changchun 130025 China

To improve the handling performance of a steer-by-wire (SBW) vehicle, a series of control logics are proposed. Firstly, an algorithm for enhancing the maneuvering in steady-state cornering is presented. On this basis, two categories of control strategies are used to dynamically correct and compensate the transient state steering responses and vehicle behaviors. Simulator tests including subjective evaluations and virtual field tests are both conducted to make comprehensive investigations on the series of control logics. The subjective evaluations demonstrate that the SBW vehicle with a specifically selected value of steering sensitivity tends to be more desirable for driving than a conventional one in which a fixed steering ratio exists. The virtual field tests indicate that the control strategies for dynamical correction and compensation could effectively improve the handling per-formances of an SBW vehicle by reducing the work load of drivers, enhancing the track-holding performance, and improving steering response properties.

关键词： Steer-by-wire （SBW） Steady-state cornering Steering sensitivity Dynamical correction

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Proper orthogonal decomposition of unsteady heat transfer from staggered cylinders at moderate reynolds numbers

Proper orthogonal decomposition of unsteady heat transfer fr...

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5th International Conference on Computational Fluid Dynamics, ICCFD 2008

作者： Sirisup, Sirod Tomkratoke, Saifhon Large-Scale Simulation Research Laboratory National Electronics and Computer Technology Center 112 Thailand Science Park Klong 1 Klong Luang Pathumthani 12120 Thailand

ISBN: (纸本)9783642012723

The characteristics of forced convection heat transfer from a pair of circular cylinders in staggered arrangements with heated upstream cylinder are investigated. The longitudinal separation to cylinder diameter ratio and the transverse separation to cylinder diameter ratio are varied from 2.5 to 5 and from 0.5 to 1, respectively. Three-dimensional direct numerical simulations (DNS) have been performed using the spectral/hp element method with the Reynolds numbers, Re, of 500 and 1000 and the Prandtl number, Pr, of 0.71. The identification of major spatially distributed features is done by extracting the proper orthogonal decomposition (POD) modes from ensemble of simulation solutions. The correlation between flow, heat transfer characteristics and POD modes is discussed.

关键词： Circular cylinders

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Quasimonoenergetic Proton Bunch Generation by Dual-Peaked Electrostatic-Field Acceleration in Foils Irradiated by an Intense Linearly Polarized Laser

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Physical Review Letters 2010年第6期105卷 065003-065003页

作者： H. B. Zhuo (卓红斌) Z. L. Chen (陈正林) W. Yu (余玮) Z. M. Sheng (盛政明) M. Y. Yu (郁明阳) Z. Jin (金展) R. Kodama (兒玉了祐) Graduate School of Engineering Osaka University 2-1 Yamada-oka Suita Osaka 565-0871 Japan National Laboratory for Parallel and Distributed Processing School of Computer Science National University of Defense Technology Changsha 410073 People’s Republic of China Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800 People’s Republic of China Department of Physics Shanghai Jiao Tong University Shanghai 200240 People’s Republic of China Beijing National Laboratory for Condensed Matter Physics Institute of Physics CAS Beijing 100080 People’s Republic of China Institute for Fusion Theory and Simulation Zhejiang University Hangzhou 310027 People’s Republic of China Institute for Theoretical Physics I Ruhr University Bochum D-44780 Germany Institute of Laser Engineering Osaka University 2-6 Yamada-oka Suita Osaka 565-0871 Japan

It is found that stable proton acceleration from a thin foil irradiated by a linearly polarized ultraintense laser can be realized for appropriate foil thickness and laser intensity. A dual-peaked electrostatic field, originating from the oscillating and nonoscillating components of the laser ponderomotive force, is formed around the foil surfaces. This field combines radiation-pressure acceleration and target normal sheath acceleration to produce a single quasimonoenergetic ion bunch. A criterion for this mechanism to be operative is obtained and verified by two-dimensional particle-in-cell simulation. At a laser intensity of ∼5.5×1022 W/cm2, quasimonoenergetic GeV proton bunches are obtained with ∼100 MeV energy spread, less than 4° spatial divergence, and ∼50% energy conversion efficiency from the laser.

关键词： Germanium compounds

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Application of numercal simulation to obtain the optimization pitch angle for VAWT

Application of numercal simulation to obtain the optimizatio...

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World Non-Grid-Connected Wind Power and Energy Conference, WNWEC

作者： Weiyong Chen C. Y. Zhou Computer Modeling and Numerical Simulation Laboratory Harbin Institute of Technology Shenzhen Guangdong China

A numerical investigation of the influence of pitch angle on vertical axis wind turbine (VAWT) aerodynamic performance is carried out using the finite volume method. The attack angle of the wind turbine is studied under a speed ratio lambda = 3D 4, and the pitch angle of the wind turbine is adjusted to optimize the working attack angle and hence the aerodynamic performance of the turbine. The flow is assumed to be 2D fully turbulent and the fluid is incompressible, and turbulence is modeled by the k-w SST. The sliding mesh technique is adopted. The present study shows that an appropriate pitch angle can apparently improve the wind turbine power-coefficient.

关键词： Wind turbines Blades Power system modeling Computational modeling Torque Computational fluid dynamics Aerodynamics Finite volume methods Wind speed Design optimization

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Effects of Buoyancy on Heat Transfer on Circular Staggered Cylinders

Effects of Buoyancy on Heat Transfer on Circular Staggered C...

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International Conference on Signal Processing Systems, ICSPS

作者： Sirod Sirisup Saifhon Tomtratoke Sornthep Vannarat Large Scale Simulation Research Laboratory National Electronics and Computer Technology Center Pathum Thani Thailand

Incompressible flow around a pair of circular cylinders in various staggered arrangements with heated upstream cylinder is investigated in this study. Three dimensional direct numerical simulation (DNS) has been performed with spatial discretization based on the spectral/hp element method with the Reynolds numbers of 200 and the Richardson numbers are varied from 0.05 to 2.0. The longitudinal separation to cylinders diameter ratio is set to 2.5 and 5.0 with transverse separation to cylinders diameter ratio is fixed at 1.0. The investigation focuses on the effects of buoyancy as well as cylinders placement on both flow structures and local heat transfer characteristics of both cylinders.

关键词： Heat transfer Engine cylinders Interference Numerical simulation Computational modeling Signal processing Large-scale systems computer simulation Laboratories Power engineering and energy

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