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32nd AIAA Applied Aerodynamics Conference 2014

作者： DeSpirito, James Kennedy, Kevin D. Mikkelsen, Clark D. Chaplin, Ross A. U.S. Army Research Laboratory Aberdeen Proving Ground RDRL-WML-E Weapons and Materials Resarch Directorate MD 21005 United States U.S. Army Aviation and Missile Research Development and Engineering Center RDMR-SSM-A System Simulation and Development Directorate Redstone Arsenal AL 35898 United States Defence Science and Technology Laboratory Air and Weapons Systems Fareham Hampshire PO17 6AD United Kingdom

ISBN: (数字)9781624102882

ISBN: (纸本)9781624102882

A supersonic jet interaction flowfield with pressure ratios of 2.8-16.7 exhausting into subsonic and transonic crossflows (Mach 0.5-0.8) was simulated using computational fluid dynamics and compared to experimental particle image velocimetry data. Three independent studies using different Reynolds-averaged Navier-Stokes flow solvers and a variety of turbulence models were used to assess the accuracy level of the predicted downsteam flow physics of the jet interaction problem. Evaluation of the prediction of the downstream flow structure was made via comparisons of the three components of velcocity and turbulent kinetic energy. In general, the predicted jet interaction flowfield was highly sensitive to the turbulence model used, with performance of the turbulence model being dependent on the flow solver, and relatively insensitive to crossflow Mach number in the range investigated.

关键词： Turbulence models

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Markerless tracking algorithm based on 3D model for augmented reality system

Markerless tracking algorithm based on 3D model for augmente...

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3rd Sino-Foreign-Interchange Workshop on Intelligent science and Intelligent Data Engineering, IScIDE 2012

作者： Yao, Peng Chen, Can Weng, Dongdong School of Optoelectronics Beijing Institute of Technology Beijing China Science and Technology on Complex Land Systems Simulation Laboratory Beijing China

ISBN: (纸本)9783642366680

We present a markerless augmented reality(AR) system based on 3D model. First, the feature of environment was extracted using SIFT operator, then the method of stratified reconstruction was used to reconstruct the 3D scene, after that we constructed the database of prior knowledge using the KDTree. Finally, we tracked the 3D model based on these prior knowledge via feature matching and pose estimation in real time. Experimental results demonstrated that this method is sufficient for markerless tracking registration. With the prior knowledge, key frame selection problem can be avoided and the running speed is also increased. © Springer-Verlag 2013.

关键词： Augmented reality

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A two-stage allocation optimization in static load balancing of HLA distributed simulation

A two-stage allocation optimization in static load balancing...

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International Conference on Cyberspace technology, CCT 2013

作者： Ban, Xiaojuan Gan, Bin Wu, Ping School of Computer and Communication Engineering of University of Science and Technology Beijing Beijing 100083 China Science and Technology on Complex Systems Simulation Laboratory Beijing 100012 China

ISBN: (纸本)9781849198011

The load balancing problem is becoming the main technical obstacle in HLA distributed simulation development with the increasing scale of distributed simulation system. The solution of task-federate mapping and federate-processor mapping used to be determined based on experiences and the entity is taken as a task granularity in simulations in order to simplify the model in previous studies. Neither the experience methods nor the previous studies could solve the huge communication overhead or load imbalance problem effectively in large scale distributed simulation. The static load balancing optimization of HLA distributed simulation is divided into task-federate mapping and federate-processor mapping, and a two-stage mapping allocation optimization method is proposed in this paper. Decreasing communication overhead of the system is the main mission in the taskfederate mapping stage and the load balancing is studied in the federate allocation stage. The effectiveness of the proposed method, which developed a new direction for static load balancing distribution optimization in distributed simulations, is verified with experiments.

关键词： Mapping

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Statistic inference for inertial instrumentation error model using Bayesian network

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5th International Conference on Mechanical and Electrical technology, ICMET 2013

作者： Hu, Zheng Dong Zhang, Liu Xin Zhou, Fei Yue Li, Zhi Jun Science and Technology on Complex Land Systems Simulation Laboratory Beijing China Southwest Computer Co. Ltd Chongqing China

ISBN: (纸本)9783037858349

For the parameter estimation problem of inertial instrumentation error models, a Bayesian network is founded to fuse the calibration data and make error coefficients statistical inference in this paper. First the fundamental of Bayesian network is stated and then how to establish network for a typical case of inertial instrumentation error coefficients estimation is illustrated. Since the difficult high-dimension integral calculus for model parameter can be avoidable, WinBUGS software based on MCMC method is used for calculation and inference. The simulated results show that using Bayesian network to make statistical inference for inertial instrumentation error model is reasonable and effective. © (2013) Trans Tech Publications, Switzerland.

关键词： Bayesian networks

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Metastable States and Wetting Transition of Submerged Superhydrophobic Structures

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Physical Review Letters 2014年第19期112卷 196101-196101页

作者： Pengyu Lv Yahui Xue Yipeng Shi Hao Lin Huiling Duan State Key Laboratory for Turbulence and Complex Systems Department of Mechanics and Engineering Science College of Engineering Peking University Beijing 100871 China Key Laboratory of High Energy Density Physics Simulation Center for Applied Physics and Technology Peking University Beijing 100871 China Mechanical and Aerospace Engineering Rutgers The State University of New Jersey 98 Brett Road Piscataway New Jersey 08854 USA

Superhydrophobicity on structured surfaces is frequently achieved via the maintenance of liquid-air interfaces adjacent to the trapped air pockets. These interfaces, however, are subject to instabilities due to the Cassie-Baxter-to-Wenzel transition and total wetting. The current work examines in situ liquid-air interfaces on a submerged surface patterned with cylindrical micropores using confocal microscopy. Both the pinned Cassie-Baxter and depinned metastable states are directly observed and measured. The metastable state dynamically evolves, leading to a transition to the Wenzel state. This process is extensively quantified under different ambient pressure conditions, and the data are in good agreement with a diffusion-based model prediction. A similarity law along with a characteristic time scale is derived which governs the lifetime of the air pockets and which can be used to predict the longevity of underwater superhydrophobicity.

关键词： HYDROPHOBIC surfaces RESEARCH METASTABLE states WETTING LIQUID air PHYSICS research

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Bibliometric and social network analysis of the SoS field

Bibliometric and social network analysis of the SoS field

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IEEE International Conference on System of systems Engineering (SoSE)

作者： Guang-rong You Xiao Sun Min Sun Ji-min Wang Ying-wu Chen Key Lab on Complex Systems Simulation Beijing Institute of System Engineering Beijing R. P. of China Department of Information Science Peking University Beijing Beijing R. P. of China National University of Defence Technology Changsha R. P. of China

This exploratory work combines bibliometric methods and social network analysis to provide a knowledge map on the development of system of systems research field. For this purpose, the study mined the published articles related to system of systems until 2012 indexed by Web of Knowledge platform including SCI-EXPANDED, SSCI, CPCI-S, and other scientific literature databases. The auctorial, institutional, national patterns in system of systems research are revealed using bibliometric methods. Social network analysis is used to discover relationships between authors and key terms in the research field. Based on this quantitative analysis, the study found the influential journals, key researchers, leading institutions and countries, and major research areas in system of systems research field. Last, suggestions are made on the future development of system of systems field.

关键词： Educational institutions Conferences Modeling Bibliometrics Social network services Collaboration

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An iterative space alternative tiling parallel algorithm for 3D finite difference stencil computations

International Journal of Database Theory and Application

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International Journal of Database Theory and Application 2014年第6期7卷 105-120页

作者： Shen, Jing Zhang, Jilin Wan, Jian Zhou, Li Jiang, Ming School of Computer Science and Technology Hangzhou Dianzi University Hangzhou Zhejiang China Key Laboratory of Complex Systems Modeling and Simulation Ministry of Education China Zhejiang Provincial Engineering Center on Media Data Cloud Processing and Analysis Hangzhou China School of Information Engineering Hangzhou Dianzi University Hangzhou Zhejiang China

Stencils are finite-difference algorithms for solving large-scale and high-dimension partial differential equations. Due to the data dependences among the iterative statements in Stencils, traditional Stencil computations are be executed serially, rather than in parallel. It's challenging to design an effective and scalable Stencil parallelized method. To address the issue of 3D data space computing, we present a serial execution model based on multi-layers symmetric Stencil method and time skewing techniques. Within this model, the iteration space is divided to multiple tiles based on time skewing, where the executive process is ordered by the sequence of tiles, and the nodes in each individual tile can be swept repeatedly to improve the data locality. In addition, we propose a novel 3D iterative space alternate tiling Stencil parallel method, which subdivides the iteration space along high dimension, and changes the execution sequence of tiles to reduce the data dependency and communication cost, where the partial order of tiles is still guaranteed. Experimental results demonstrate our proposed alternative tiling parallel method achieves better parallel efficiency and scalability compared with the domain-decomposition methods.

关键词： Iterative methods

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Research on simulation-experimentation-based effectiveness evaluation of digitized forcespi0215es command and control system

Research on simulation-experimentation-based effectiveness e...

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13th International Conference on systems simulation, AsiaSim 2013

作者： Fang, Zhao Tao, Zhang Xin, Wei Jun, Zhao Xin College of Automation Science and Electrical Engineering Beijing University of Aeronautics and Astronautics Beijing 100191 China Science and Technology on Complex Simulation Land Systems Simulation Laboratory Beijing 100072 China Naval Academy of Armament 100036 China

ISBN: (纸本)9783642450365

Pitched at problems needing to be solved for evaluating the digitized forcespi0215es command & control (DF C2) system, this paper proposes the major contents and processes for evaluating the C2 systemspi0215es effectiveness based on simulation experimentation, lays down the Measures of Efficiencies(MoEs) system of effectiveness evaluation (EE) for the C2 system, and analyzes, through the design of experiment samples and the planning of the evaluation process, how to use the simulation-experiment approaches of comparison and statistics to conduct effectiveness evaluation, contribution analysis and optimization analysis of the C2 system. © Springer-Verlag Berlin Heidelberg 2013.

关键词： Design of experiments

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The application of entropy weighting ideal point method in electronic information equipment system of systems construction decision-making

The application of entropy weighting ideal point method in e...

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2013 International Conference on Mechanical and Electronics Engineering, ICMEE 2013

作者： Zhao, Zhi Qiang Wang, Zhi Gang College of Mechaeronics Engineering and Automation National University of Defense Technology Changsha Hunan 410031 China Science and Technology on Complex land Systems Simulation Laboratory Beijing 100012 China

ISBN: (纸本)9783037858103

The equipment system of systems (ESoS) construction risk analysis is great significance to enhance decision-making and management level of information technology ESoS construction. The concept of entropy in the information engineering is using to calculate the entropy, and the entropy weight is used to fix subjective weight, after that Combining ideal point method to evaluate and select the schemes, the best decision of ESoS construction is get. The model is of impersonality and in reason, which provided a simple and practical method for construction risk evaluation of electronic information ESoS. © (2013) Trans Tech Publications, Switzerland.

关键词： Decision making

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An Architectural Approach for Capability Mapping and Gap Analysis

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Journal of systems science and Information 2013年第1期1卷 86-96页

作者： Kewei YANG Bingfeng GE Qingsong ZHAO Jiang JIANG Science and Technology on Complex Systems Simulation Laboratory National University of Defense Technology College of Information System and Management

To cope with the increasing complexity and constantly changing capability requirements of system-of-systems, an architectural approach for capability mapping and gap analysis is ***, a more specific architecture framework is presented. Secondly, on the basis of the analysis of the semantic relationships between constituent architecture data elements, a capability mapping approach is proposed to manage the relations between capabilities and systems based on the mapping matrixes representing associations of core entities. Then, a four-step capability mapping process for the mapping from capabilities to systems is suggested. Moreover, the capability gap analysis on how to identify and fill the capability gaps is also studied. Finally, an example of specific Net-Centric Warfare mission of Precision Engagement is used to illustrate the feasibility of the approach.

关键词： system-of-systems capability architecture description mapping matrixes core entities gap analysis

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