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12th Annual Conference on Innovation and Technology in Computer Science Education

作者： Myller, Niko Laakso, Mikko Korhonen, Ari Univ Joensuu Dept Comp Sci & Stat FI-80101 Joensuu Finland

ISBN: (纸本)9781595936103

More collaborative use of visualizations is taking place in the classrooms due to the introduction of pair programming and collaborative learning as teaching and learning methods. This introduces new challenges to the visualization tools, and thus, research and theory to support the development of collaborative visualization tools is needed. We present an empirical study in which the learning outcomes of students were compared when students were learning in collaboration and using materials which contained visualizations on different, engagement levels. Results indicate that the level of engagement has an effect on students learning results although the difference is not statistically significant. Especially students without previous knowledge seem to gain more from using visualizations on higher engagement level.

关键词： algorithm Visualization algorithm simulation Collaborative Learning Engagement Taxonomy

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The simulation of SINS Based on MEMS Inertial Sensors for Rolling Projectile

The Simulation of SINS Based on MEMS Inertial Sensors for Ro...

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2007国际机械工程与力学会议

作者： Ding LI Xiongzhu BU School of Mechanical Engineering Nanjing University of Science and Technology

Current development status and future development trend of MEMS inertial sensors are introduced in this paper firstly. A micro Strap-down Inertial Navigation System (SINS) with 3-axis micro accelerometer and 3-axis MEMS gyro is designed, and the SINS algorithm is simulated using MATLAB/SIMULINK. The simulation model of the Micro-inertial navigation system is established, and algorithm block diagram is also given, including the quaternion and flight parameter updating, the influence of the sensors' performance for the SINS accuracy is also analyzed. The input data of algorithm simulation platform would be all or partial output from the real MEMS inertial sensors or the projectile body in specific motion. The simulation results show that the algorithm is not only valid but also could be used to analyze the system function.

关键词： projectile MEMS inertial sensors Module of SINS algorithm simulation

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Synthesis of circular antenna array using crossed particle swarm optimization algorithm

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JOURNAL OF ELECTROMAGNETIC WAVES AND APPLICATIONS 2006年第13期20卷 1785-1795页

作者： Chen, T. B. Dong, Y. L. Jiao, Y. C. Zhang, F. S. Xidian Univ Natl Lab Antennas & Microwave Technol Xian 710071 Peoples R China

The particle swarm optimization (PSO) algorithm presents a new way for finding an optimal solution of complex optimization problems. In this paper a modified particle swarm optimization algorithm is applied to the optimization of the antenna array. We modify the PSO algorithm in some aspects. Firstly, the dynamic parameter is introduced to update the position equation, and the particles are limited in the search region. A new strategy for updating the speed is then adopted, in which the speed is weakened linearly. Based on these strategies, we proposed a new PSO algorithm named the crossed PSO algorithm. simulation results show that the optimal pattern of the antenna array is able to approach the desired pattern. The results also demonstrate that the modified algorithm is superior to the original algorithm and the nonlinear least-square method.

关键词： synthesis optimal solution Particle swarm optimization algorithms Antenna arrays Loop antennas dynamic parameter algorithm simulation parametric subharmonic oscillator particle swarm algorithm speed

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Robust rank-EASI algorithm for blind source separation

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IEE PROCEEDINGS-COMMUNICATIONS 2004年第1期151卷 15-19页

作者： Zhang, Y Kassam, SA Univ Penn Dept Elect Engn Philadelphia PA 19104 USA

Robustness against deviations from nominal source pdf assumptions is very desirable in blind source separation (BSS) algorithms. In the paper, a new approach for robust BSS is proposed. The EASI (equivariant adaptive separation by independence) algorithm (Cardoso and Laheld, 1996) is modified to use ranks of observed signals. The modified EASI algorithm can be applied to both real-valued and complex-valued data. Design guidelines are discussed for the nonlinear rank weighting functions in the modified EASI algorithm. simulation results for two examples are given, showing very good performance.

关键词： Blind source separation data design Source separation WEIGHTING FUNCTIONS algorithms Modified algorithm simulation Robustness

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Magnetic properties of icosahedral copper-coated cobalt clusters

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SURFACE REVIEW AND LETTERS 2004年第1期11卷 15-20页

作者： Wang, BL Chen, XS Chen, GB Wang, GH Zhao, JJ Huaiyin Inst Technol Dept Phys Jiangsu 223001 Peoples R China Chinese Acad Sci Shanghai Inst Tech Phys Nat Lab Infrared Phys Shanghai 200083 Peoples R China Nanjing Univ Natl Lab Solid State Microstruct Nanjing 210093 Peoples R China Nanjing Univ Dept Phys Nanjing 210093 Peoples R China Univ N Carolina Dept Phys & Astron Chapel Hill NC 27599 USA

The structural and magnetic properties of Cu-coated Cc clusters are investigated with empirical genetic algorithm simulation and a spin-polarized spd tight-binding model Hamiltonian. In some specific stoichiometric compositions, icosahedral Co-n (n = 1, 2, 4, 7, 13, 19, 55) clusters perfectly coated with A Cu monolayer or dual layer are obtained. The outer Cu layers lead to significant modification of the magnetic moment of the Co core, depending on the structure and thickness of the Cu layers. The interaction between Cu and Co atoms induces a nonzero magnetic moment for Cu atoms.

关键词： Magnetic moment Copper Clusters algorithm simulation Magnetic properties

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A stable algorithm for simulation of array induction and measurement-while-driving logging tools

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RADIO SCIENCE 1998年第4期33卷 949-956页

作者： Tian, X Liu, C Shen, LC Univ Houston Dept Elect & Comp Engn Houston TX 77204 USA

A stable numerical method to simulate array induction and measurement-while-drilling (MWD) logs is presented. The algorithm is based on a horizontal eigenmode expansion method. Mode propagation in the vertical direction is described by three-layer modules. Within each module, general transmission and reflection coefficients are obtained by tracing the propagation of the modes. The multilayer cases are treated as a cascade of such modules. Owing to the mode-tracing algorithm, numerical stability and efficiency are superior to the other methods. This numerical algorithm is applied to the simulation of array induction and MWD logs in formations with both vertical and horizontal layers.

关键词： perpendicular direction A* algorithm MWD SYSTEMS induction Geologic Formations algorithms simulating algorithm simulation arrays

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Neural network based dynamic modeling of flexible-link manipulators with application to the SSRMS

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JOURNAL OF ROBOTIC SYSTEMS 2000年第7期17卷 385-401页

作者： Talebi, HA Patel, RV Asmer, H Univ Western Ontario Dept Elect & Comp Engn London ON N6A 5B9 Canada Amir Kabir Univ Dept Elect Engn Tehran 15914 Iran Canadian Space Agcy Space Technol St Hubert PQ J3Y 8Y9 Canada

This paper presents an approach for dynamic modeling of flexible-link manipulators using artificial neural networks. A state-space representation is considered for a neural identifier. A recurrent network configuration is obtained by a combination of feedforward network architectures with dynamical elements in the form of stable filters. To guarantee the boundedness of the states, a joint PD control is introduced in the system. The method can be considered both as an online identifier that can be used as a basis for designing neural network controllers as well as an offline learning scheme to compute deflections due to Link flexibility for evaluating forward dynamics. Unlike many other methods, the proposed approach does not assume knowledge of the nonlinearities of the system nor that the nonlinear system is linear in parameters. The performance of the proposed neural identifier is evaluated by identifying the dynamics of different flexible-link manipulators. To demonstrate the effectiveness of the algorithm, simulation results for a single-link manipulator, a two-link planar manipulator, and the Space Station Remote Manipulator System (SSRMS) are presented. (C) 2000 John Wiley & Sons, Inc.

关键词： flexible link manipulators Neural network controllers dynamic models Proportional derivative control algorithm simulation Space Station Remote Manipulator System Neural network Manipulators

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Exact local bosonic algorithm for dynamical quarks

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NUCLEAR PHYSICS B 1997年第1-3期53卷 956-958页

作者： Galli, A deForcrand, P ETH ZENTRUM SCSC CH-8092 ZURICH SWITZERLAND

We present an exact local bosonic algorithm for the simulation of dynamical fermions in lattice QCD. We show that this algorithm is a viable alternative to the Hybrid Monte Carlo algorithm.

关键词： Qcd quantum chromodynamics Lattice QCD Fermions algorithms algorithm simulation

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PROTOTYPING ENVIRONMENT FOR DIGITAL SIGNAL-PROCESSING SYSTEMS

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COMPUTING & CONTROL ENGINEERING JOURNAL 1995年第2期6卷 83-92页

作者： IP, SFA WESTALL, FA KNOWLES, RJ BENYON, PR EASTON, PW British Telecom Res. Labs. Ipswich UK

The growing worldwide interest in exploiting programmable digital signal processors (DSPs) in telecommunication applications and systems has established the need for a prototyping environment. This environment comprises various computer-aided software and hardware tools to meet the requirements of the development process, including specification, algorithm simulation, analysis, implementation and verification. This article discusses the issues concerning a prototyping process and the need for support tools for developing DSP applications. It is followed by an overview of existing tools and techniques. An integrated signal processing application development environment (SPADE) is then described.

关键词： telecommunication applications SPADE programming algorithm simulation programmable digital signal processors computer aided software DSP applications Digital signal processing Signal processing and detection hardware tools prototyping environment Systems analysis and programming signal processing signal processing equipment digital signal processing systems integrated signal processing application development environment Communications computing

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A NONLOCAL MONTE-CARLO algorithm FOR LATTICE TREES

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JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL 1992年第2期25卷 303-333页

作者： VANRENSBURG, EJJ MADRAS, N YORK UNIV DEPT MATH & STATN YORK M3J 1P3ONTARIOCANADA

A new non-local algorithm for the simulation of trees on the lattice Z(d) is proposed. We study the implementation and the properties of the algorithm, and show that it is decisively better than an algorithm which performs only local moves. We use the new algorithm to investigate the properties of lattice trees in two, three, four, eight and nine dimensions.

关键词： trees Trees crystal lattices algorithms Hypoderma Writers algorithm simulation

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