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2007 NSTI Nanotechnology Conference and Trade Show - NSTI Nanotech 2007

作者： Xiao, S.P. Andersen, David Hou, W.Y. Department of Mechanical and Industrial Engineering Center for Computer-Aided Design University of Iowa Iowa City IA United States University of Iowa Iowa City IA United States

ISBN: (纸本)1420061828

In this paper, we first investigate mechanisms of nanotube-based co-axial oscillators based on molecular dynamics simulation. If an oscillator is an isolated system, stable oscillations of the inner tube inside of the outer tube can be observed with high oscillatory frequencies. We also study the interlayer friction between the outer tube and the inner tube when nano-oscillators are at finite temperatures. Based on the above studies, we propose to design a nanoelectromechanical oscillator system, which can provide stable oscillation. In addition, we propose the first numerical study of nanotube-based resonant oscillators via a new multiscale method.

关键词： Oscillators (electronic)

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Geometric design of developable Bezier and B-spline parametric surfaces

Geometric design of developable Bezier and B-spline parametr...

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SNPD 2007: 8th ACIS International Conference on Software engineering, Artificial Intelligence, Networking, and Parallel/Distributed Computing

作者： Junqing, Yang Min, Zhou Quanyi, Lv Hongchan, Zheng Department of Computer Engineering Xi'an Aerotechnical College Xi'an 710077 China College of Science Northwestern Polytechnical University Xi'an 710072 China Department of Software Engineering and Graphics Processing Department of Theory of Spline and Geometric Design Department of Mathematics and Computation Department of Theory of Subdivision and Geometric Design

ISBN: (纸本)0769529097

Using the concept of duality between points and planes in 3D projective space, an explicit and efficient method of computer-aided design for developable surfaces based on Bezier and B-spline basis functions is proposed. By the result that a developable surface is the envelope of a single-parameter family of planes, we give the parametric equation of a Bezier and B-spline developable surface, and discuss respectively properties of Bezier and B-spline representations. Meanwhile, we also present a simplified geometric-construction for developable surfaces, that is, G2 Beta restraint condition algorithm for G2 continuity between two developable surfaces. It is shown that the geometric construction technique that exists for curves also can be generalized to the design of developable surfaces. © 2007 IEEE.

关键词： computational geometry

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Studies of nanotube-based resonant oscillators through multiscale modeling and simulation

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Physical Review B 2007年第12期75卷 125414-125414页

作者： Shaoping Xiao Wenyi Hou Department of Mechanical and Industrial Engineering and Center for Computer-Aided Design The University of Iowa Iowa City Iowa 52242 USA

We propose a multiscale method to study nanotube-based resonant oscillators. In the multiscale model, nanotubes are modeled via molecular dynamics, while the metal paddle is modeled as a rigid body. The molecular and continuum models are attached to each other through the interfaces on which carbon atoms are located. We employ the concepts of “virtual” atoms and bonds to effectively couple the molecular and continuum models. Using the proposed multiscale method, we investigate both linear and nonlinear characteristics of resonant oscillators. Effects of vacancy and temperature on mechanisms of oscillators are discussed.

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Bridging domain multiscale method

Bridging domain multiscale method

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2007 NSTI Nanotechnology Conference and Trade Show - NSTI Nanotech 2007

作者： Xiao, S.P. Belytschko, T. Hou, W.Y. University of Iowa Department of Mechanical and Industrial Engineering Center for Computer-Aided Design Iowa City IA United States Northwestern University Evanston IL United States University of Iowa Iowa City IA United States

ISBN: (纸本)1420061828

A bridging domain method for coupling continuum models with molecular models is described. In this method, the continuum and molecular domains are overlapped in a bridging subdomain, where the Hamiltonian is taken to be a linear combination of the continuum and molecular Hamiltonians. We enforce the compatibility in the bridging domain by Lagrange multipliers or by the augmented Lagrangian method. An explicit algorithm for dynamic solutions is developed. In this paper, the bridging domain multiscale method is employed to study nanotube-based composites.

关键词： Molecular dynamics

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STL mesh reconstruction for bio-medical rapid prototyping model

STL mesh reconstruction for bio-medical rapid prototyping mo...

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IEEE International Conference on Systems, Man and Cybernetics

作者： C.S. Wang C.Y. Hsiao T.R. Chang C.K. Teng Department of Industrial Design Tunghai University Taichung Taiwan Department of Mechanical and Computer Aided Engineering Feng Chia University FCU Taichung Taiwan Department of Industrial Engineering and Management Nankai Institute of Technology Nantou Taiwan

This paper presents the construction of 3D rapid prototyping (RP) physical models for computer tomography (CT) medical images. By using STL (Stereo Lithography) triangular meshes as basis for 3D construction, the process for RP model construction can be simplified via point data without turning them into curves. Grey prediction theory is used to sort out contour point data in each layer of the medical image. Using contour difference detection operation, the sequence is completed operation through the cross-sectional contours. The 3D solid model constructed via layer by layer meshes is to build the STL file. After saving as STL file, 3D solid model of the medical image is displayed with RP and its virtual reality presentation. Two case studies, human braincase and femur bone are used as case study for construction of 3D solid model with medical images. The method is successful and a number of steps are simplified. The two solid models are compared with curves swept-blend CAD models for analysis. The results show that differences between the two methods are in an acceptable range; therefore, it is shown that this method is feasible for reconstructing 3D models from CT medical images.

关键词： Prototypes Biomedical imaging Solid modeling Image reconstruction Computed tomography Physics computing Lithography Turning Prediction theory Virtual reality

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Conceptual design of compliant mechanisms using level set method

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中国高等学校学术文摘·机械工程 2006年第2期1卷 131-145页

作者： Shi-kui CHEN Michael Yu WANG Computational Modeling and Design Laboratory Department of Automation and Computer-Aided EngineeringThe Chinese University of Hong KongShatinN.T.Hong KongChina

We propose a level set method-based framework for the conceptual design of compliant *** this method,the compliant mechanism design problem is recast as an infinite dimensional optimization problem,where the design variable is the geometric shape of the compliant mechanism and the goal is to find a suitable shape in the admissible design space so that the objective functional can reach a *** geometric shape of the compliant mechanism is represented as the zero level set of a one-higher dimensional level set function,and the dynamic variations of the shape are governed by the Hamilton-Jacobi partial differential *** application of level set methods endows the optimization process with the particular quality that topological changes of the boundary,such as merging or splitting,can be handled in a natural *** making a connection between the velocity field in the Hamilton-Jacobi partial differential equation with the shape gradient of the objective functional,we go further to transform the optimization problem into that of finding a steady-state solution of the partial differential *** the above-mentioned methodological issues,some numerical examples together with prototypes are presented to validate the performance of the method.

关键词： compliant mechanisms conceptual design level set methods shape gradient Hamilton- Jacobi PDE

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Developing AMIE: An adaptive multimedia integrated environment

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3rd International Workshop on Adaptive Multimedia Retrieval: User, Context, and Feedback, AMR 2005

作者： El Demerdash, Osama Bergler, Sabine Kosseim, Leila Langshaw, P. Karen Concordia University Department of Computer Science and Software Engineering Canada Concordia University Department of Design and Computation Arts Canada

ISBN: (纸本)3540321748

Large multimedia repositories can be used more effectively by providing a hybrid environment for accomplishing common tasks, such as searching, browsing, presenting and indexing of the material. In order to achieve this end, the semantic and relational information must accompany the technical, content-based data. In this paper, we present the framework underlying the development of a hybrid retrieval/presentation environment and a prototype in its early stages of development. © Springer-Verlag Berlin Heidelberg 2006.

关键词： Information retrieval

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Generalization of sorting in single hop wireless networks

Generalization of sorting in single hop wireless networks

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作者： Shiau, Shyue-Horng Yang, Chang-Biau Department of Computer Science and Engineering National Sun Yat-sen University Kaohsiung 804 Taiwan Department of Computer Aided Media Design Chung Jung University Tainan Taiwan Department of Computer Science and Engineering National Sun Yat-sen University Japan

The generalized sorting problem is to find the first k largest elements among n input elements and to report them in a sorted order. In this paper, we propose a fast generalized sorting algorithm under the single hop wireless networks model with collision detection (WNCD). The algorithm is based on the maximum finding algorithm and the sorting algorithm. The key point of our algorithm is to use successful broadcasts to build broadcasting layers logically and then to distribute the data elements into those logic layers properly. Thus, the number of broadcast conflicts is reduced. We prove that the average time complexity required for our generalized sorting algorithm is θ (k + log (n - k)). When k = 1, our generalized sorting algorithm does the work of finding maximum, and when k = n, it does the work of sorting. Thus, the analysis of our algorithm builds a connection between the two extremely special cases which are maximum finding and sorting. Copyright © 2006 The Institute of Electronics, Information and Communication Engineers.

关键词： Sorting

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Distributed real-time vehicle validation

Distributed real-time vehicle validation

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2006 ASME International design engineering Technical Conferences and computers and Information In engineering Conference, DETC2006

作者： Nybacka, Mikael Larsson, Tobias Johanson, Mathias Törlind, Peter Division of Computer Aided Design Department of Mechanical Engineering Luleå University of Technology SE-971 87 Luleå Sweden Alkit Communication SE-431 37 Mölndal Sweden

ISBN: (纸本)079183784X

Due to the increasing complexity of embedded systems and software in vehicles, the automotive industry faces an increasing need for testing and verification of components and subsystems under realistic conditions. At the same time, development cycles must be shortened for vehicle manufacturers to be competitive on the global market, and an increased amount of testing and verification must thus be performed in less time. However, simply increasing the testing volume can be prohibitively costly, meaning that testing and verification processes must be made more efficient to reduce the need for more prototypes. This paper presents a concept for distributed testing and verification of vehicles in real-time, with the aim of improving testing and verification efficiency. Through a novel combination of software tools for distributed collaborative engineering, real-time simulation, visualization, and black box simulation, the realized system makes it possible for vehicle manufacturers and their subcontractors to work more concurrently and efficiently with testing and validation. An early implementation of a system prototype is described and future development plans for the system are presented. The main software components used to build up the system are ADAMS/Car RealTime, Matlab/Simulink and a Java-based real-time visualization module originally developed for the gaming industry. A main benefit of the concept is that different disciplines involved in the product development process can use the system to enhance the concurrency between them. Control systems and mechanical engineers can view ongoing tests in real-time and change designs, and efficiently re-simulate and influence ongoing tests in a distributed manner. Through advanced visualization of simulation results and measurement data, engineers can get a clearer view of how the system or product behaves, thereby improving the quality of the validation process. The concept for distributed real-time simulation and visual

关键词： Distributed computer systems

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A New Dislocation-Dynamics Model and Its Application in Thin Film-Substrate Systems

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MRS Online Proceedings Library 2006年第1期875卷 1-6页

作者： E. H. Tan L. Z. Sun Department of Civil and Environmental Engineering and Center for Computer-Aided Design The University of Iowa Iowa City USA

Based on the physical background, a new dislocation dynamics model fully incorporating the interaction among differential dislocation segments is developed to simulate 3D dislocation motion in crystals. As the numerical simulation results demonstrate, this new model completely solves the long-standing problem that simulation results are heavily dependent on dislocation-segment lengths in the classical dislocation dynamics theory. The proposed model is applied to simulate the effect of dislocations on the mechanical performance of thin films. The interactions among the dislocation loops, free surface and interfaces are rigorously computed by a decomposition method. This framework can be used to simulate how a surface loop evolves into two threading dislocations and to determine the critical thickness of thin films. Furthermore, the relationship between the film thickness and yield strength is established and compared with the conventional Hall-Petch relation.

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