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International Conference on Control and Automation (ICCA)

作者： K. Tang B. Wang W. Kang B. Chen Internship program Naval Postgraduate School Monterrey CA USA Department of Electrical and Computer Engineering University of Singapore Singapore Department of Applied Mathematics Naval Postgraduate School Monterrey CA USA

This paper focuses on the problem of minimum time trajectory planning for helicopter UAVs. It is formulated as a nonlinear optimal control subject to the dynamics and limitations of helicopter UAVs. The dynamical system is defined by a set of fifteen states nonlinear differential equations developed for HeLion, a UAV helicopter constructed in National University of Singapore (NUS). The problem is then solved numerically using pseudospectral method for dynamic optimization. The results show that minimum time trajectories are highly nonlinear that require complicated maneuvering.

关键词： Trajectory Helicopters Mathematical model Approximation methods Planning Aerodynamics Vectors

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Invited paper: LTPS backplane technologies for AMLCDs and AMOLEDs

Invited paper: LTPS backplane technologies for AMLCDs and AM...

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49th Annual SID Symposium, Seminar, and Exhibition 2011, Display Week 2011

作者： Kim, Chi Woo Jung, Jin Goo Choi, Jae Beom Kim, Deok Hui Yi, Chung Kim, Hye Dong Choi, Yun Ho Im, James Process Development Team 1 Samsung Mobile Display Co. Ltd. Cheonan-City Chungcheongnam-Do Korea Republic of Process Development Team 2 Samsung Mobile Display Co. Ltd. Giheung-Gu Yongin-City Gyeonggi-Do Korea Republic of Program in Materials Science and Engineering Department of Applied Physics and Applied Mathematics Columbia University New York NY United States

ISBN: (纸本)9781618390967

In this paper, we review various LTPS backplane technologies based on laser-crystallization and other related methods that have been applied to AMLCD and AMOLED displays. The TFT performances obtained by different melt-mediated crystallization methods with excimer laser and solid phase crystallization will be compared. The technical issues of the image quality and the resolution will be discussed.

关键词： Excimer lasers

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Free convection flow and heat transfer between two vertical parallel plates with variable temperature at one boundary

Acta Technica CSAV (Ceskoslovensk Akademie Ved)

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Acta Technica CSAV (Ceskoslovensk Akademie Ved) 2011年第1期56卷 103-113页

作者： Narahari, Marneni Dutta, Binay K. Fundamental and Applied Sciences Department Universiti Teknologi PETRONAS 31750 Tronoh Bandar Seri Iskandar Perak Darul Ridzuan Malaysia Chemical Engineering Program Petroleum Institute Abu Dhabi United Arab Emirates

An exact solution to the problem of unsteady free convection flow and heat transfer in a viscous incompressible fluid between two long vertical parallel plates is presented. The temperature at one of the plates increases linearly with time while that at the other plate remains constant at the initial fluid temperature. The dimensionless governing equations are solved using Laplace transform technique. The solutions are obtained in the forms of rapidly converging infinite series. Computed velocity and temperature profiles as well as the shear stress and heat flux at the plates are presented. The parametric and temporal variations of the relevant quantities are discussed. © 2011 Institute of Thermomechanics AS CR, v.v.i.

关键词： Natural convection

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K, T and D-like fuzzy Kripke models

K, T and D-like fuzzy Kripke models

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Annual Meeting of The North American Fuzzy Information Processing Society

作者： Bedregal, Benjamin Santiago, Regivan H. N. Benevides, Mario Viana, Petrucio Group of Logic Language Information Theory and Applications - LoLITA Department of Informatics and Applied Mathematics Federal University of Rio Grande Do Norte 59072-970 Natal-RN Brazil Program of Engineering of Systems and Computing - PESC Department of Computer Science Federal University of Rio de Janeiro 21941-972 Rio de Janeiro-RJ Brazil Department of Analysis Fluminense Federal University 24020-140 Niterói-RJ Brazil

ISBN: (纸本)9781612849676

The idea of a Kripke semantics endowed with possibility/plausibility information is not new;in fact there are different approaches for that;see: [6], [13], [16], [19]. This paper follows the approach found in [6], but whereas [6] provides a fixed interpretation for connectives into [0,1] here we provide a characterization of a fuzzy semantics for connectives in such a way that the resulting fuzzy frames: K, T and D, are described precisely by the set of statements which also describes, respectively, the usual modal systems K, T and D. © 2011 IEEE.

关键词： Semantics

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Multi-Tier Network Performance Analysis Using a Shotgun Cellular System

Multi-Tier Network Performance Analysis Using a Shotgun Cell...

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2011 IEEE Global Telecommunications Conference - GLOBECOM 2011

作者： Prasanna Madhusudhanan Juan G. Restrepo Youjian Liu Timothy X. Brown Kenneth R. Baker Department of Electrical Computer and Energy Engineering University of Colorado Boulder CO USA Department of Applied Mathematics University of Colorado Boulder CO USA Department of Electrical Computer and Energy Engineering Interdisciplinary Telecommunications Program University of Colorado Boulder CO USA Interdisciplinary Telecommunications Program University of Colorado Boulder CO USA

This paper studies the carrier-to-interference ratio (CIR) and carrier-to-interference-plus-noise ratio (CINR) performance at the mobile station (MS) within a multi-tier network composed of M tiers of wireless networks, with each tier modeled as the homogeneous n-dimensional (n-D, n=1,2, and 3) shotgun cellular system, where the base station (BS) distribution is given by the homogeneous Poisson point process in n-D. The CIR and CINR at the MS in a single tier network are thoroughly analyzed to simplify the analysis of the multi-tier network. For the multi-tier network with given system parameters, the following are the main results of this paper: (1) semi-analytical expressions for the tail probabilities of CIR and CINR; (2) a closed form expression for the tail probability of CIR in the range [1,infinity); (3) a closed form expression for the tail probability of an approximation to CINR in the entire range [0,infinity); (4) a lookup table based approach for obtaining the tail probability of CINR, and (5) the study of the effect of shadow fading and BSs with ideal sectorized antennas on the CIR and CINR. Based on these results, it is shown that, in a practical cellular system, the installation of additional wireless networks (microcells, picocells and femtocells) with low power BSs over the already existing macrocell network will always improve the CINR performance at the MS.

关键词： Fading Noise Approximation methods Random variables Closed-form solutions Macrocell networks Femtocells

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Modeling of Failure in Metallic Thin Films Induced by Stress and Electromigration: A Multiscale Computational Analysis

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MRS Online Proceedings Library 2011年第1期538卷 263-268页

作者： M. R. Gungor L. J. Gray S. J. Zhou D. Maroudas Department of Chemical Engineering University of California Santa Barbara USA Computer Sciences & Mathematics Division Oak Ridge National Laboratory Oak Ridge USA Applied Theoretical and Computational Physics Division Los Alamos National Laboratory Los Alamos USA

A common failure mechanism in metallic thin-film interconnects is void propagation driven by electric fields and thermomechanical stresses. In this paper, a multiscale computational analysis is presented for predictive modeling of transgranular void dynamics. The modeling approach is hierarchical and involves atomistic simulations for property database development, molecular-dynamics simulations for understanding of void-tip mechanisms, and self-consistent mesoscopic simulations based on boundary-element methods and techniques for moving boundary propagation. An extremely rich void dynamical behavior is predicted, which includes faceting, facet selection, propagation of slits from the void surface, as well as formation of fine-scale crack-like features on the void surface, in agreement with recent experimental data.

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Continuum model of irradiation-induced spinodal decomposition in the presence of dislocations

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Physical Review B 2011年第17期83卷 174106-174106页

作者： J. J. Hoyt M. Haataja Department of Materials Science and Engineering McMaster University Hamilton Ontario Canada L8S4L7 Department of Mechanical and Aerospace Engineering Princeton Institute for the Science and Technology of Materials (PRISM) Program in Applied and Computational Mathematics (PACM) Princeton University Princeton New Jersey 08544

A model of phase-separation kinetics in systems exposed to energetic particle irradiation has been extended to include the effects of mobile dislocations. It is shown that when dislocations are allowed to participate in the decomposition reaction, phase separation can occur at temperatures above the coherent spinodal, which is in agreement with several experiments on irradiated alloys. A linear stability analysis of the governing kinetic equations is performed and three regimes of microstructural evolution are identified within the parameter space of damage cascade size vs incident flux: complete phase separation, solid-solution behavior, and compositional patterning. In addition, numerical simulations of the evolving dislocation density and composition fields are performed. The numerical results provide the amplitude and wavelength of the stable patterns that can form under irradiation and elucidate the role of misfit dislocations in reducing the coherency strain due to atomic size mismatch.

关键词： PHASE transformations (Physics) THERMODYNAMICS PARTICLES (Nuclear physics) ALLOYS IRRADIATION STRAINS & stresses (Mechanics)

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Low-dimensional models from upper bound theory

Low-dimensional models from upper bound theory

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作者： Chini, Gregory P. Dianati, Navid Zhang, Zhexuan Doering, Charles R. Department of Mechanical Engineering University of New Hampshire Durham NH 03824 United States Center for Fluid Physics University of New Hampshire Durham NH 03824 United States Program in Integrated Applied Mathematics University of New Hampshire Durham NH 03824 United States Department of Physics University of Michigan Ann Arbor MI 48109-1040 United States Department of Mathematics University of Michigan Ann Arbor MI 48109-1043 United States Center for the Study of Complex Systems University of Michigan Ann Arbor MI 48109-1107 United States

A novel model reduction strategy for forced dissipative infinite-dimensional nonlinear dynamical systems is described. Unlike popular but empirical methods, this new approach does not require extensive data sets from experiments or direct numerical simulations of the governing field equations. Instead, truly predictive reduced dynamical models are constructed using Galerkin projection onto a priori eigenfunctions drawn from energy stability and upper bound theory. Within the context of porous medium convection, we show that these eigenfunctions contain information about boundary layers and other complex dynamic features and, thus, are well suited for the low-order description of highly nonlinear phenomena. Crucially, our analysis reveals the existence of a gap in the eigenvalue spectrumeven for strongly supercritical forcing conditionsenabling the identification of a rational truncation scheme. We demonstrate the efficacy of our approach via comparison with FourierGalerkin approximations of various orders. © 2010 Elsevier B.V. All rights reserved.

关键词： Chaos theory

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Reducing time delays on congested road networks using social navigation

Reducing time delays on congested road networks using social...

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IEEE Forum on Integrated and Sustainable Transportation System (FISTS)

作者： Alje van den Bosch Bart van Arem Mohamed Mahmod James Misener Department of Applied Mathematics Faculty of Electrical Engineering Mathematics and Computer Science University of Twente Netherlands Partners for Advanced Transit and Highways (PATH) program University of California Berkeley USA Department of Transport and Planning at the Faculty of Civil Engineering and Geosciences Delft University of Technnology Netherlands Centre of Transport Studies Faculty of Engineering University of Twente Enschede Netherlands

Social navigation provides drivers with an advice that aims to shift traffic flows in a network from a user equilibrium to a system optimum. The advice is based on minimizing a combination of the individual travel time and the marginal total travel time in the network. The level of altruism defines the extent to which a driver is willing to sacrifice his own travel time in favor of other drivers. Fuel consumption and CO2 emission are taking into account by converting them into time equivalent. Experimental results for a small network loosely representing the Bay area show that social navigation can reduce time delays by 10%. The reduction is positively correlated with network load, market penetration and level of altruism.

关键词： Navigation Driver circuits Vehicles Fuels Vehicle dynamics Roads Approximation methods

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Conditional inactivation of Pten with EGFR overexpression in Schwann cells models sporadic MPNST

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Sarcoma 2012年第1期2012卷 620834页

作者： Keng, Vincent W. Watson, Adrienne L. Rahrmann, Eric P. Li, Hua Tschida, Barbara R. Moriarity, Branden S. Choi, Kwangmin Rizvi, Tilat A. Collins, Margaret H. Wallace, Margaret R. Ratner, Nancy Largaespada, David A. Masonic Cancer Center University of Minnesota Minneapolis MN 55455 United States Department of Genetics Cell Biology and Development University of Minnesota Minneapolis MN 55455 United States Center for Genome Engineering University of Minnesota Minneapolis MN 55455 United States Brain Tumor Program University of Minnesota Minneapolis MN 55455 United States Department of Applied Biology and Chemical Technology Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong Department of Molecular Genetics and Microbiology University of Florida Gainesville FL 32610 United States Division of Experimental Hematology and Cancer Biology Cincinnati Children's Hospital Research Foundation Cincinnati Children's Hospital Medical Center Cincinnati OH 45229 United States Division of Pathology and Laboratory Medicine Cincinnati Children's Hospital Research Foundation Cincinnati Children's Hospital Medical Center Cincinnati OH 45229 United States UF Shands Cancer Center Genetics Institute University of Florida Gainesville FL 32610 United States Department of Pediatrics University of Minnesota Minneapolis MN 55455 United States

The genetic mechanisms involved in the transformation from a benign neurofibroma to a malignant sarcoma in patients with neurofibromatosis-type-1- (NF1-)associated or sporadic malignant peripheral nerve sheath tumors (MPNSTs) remain unclear. It is hypothesized that many genetic changes are involved in transformation. Recently, it has been shown that both phosphatase and tensin homolog (PTEN) and epidermal growth factor receptor (EGFR) play important roles in the initiation of peripheral nerve sheath tumors (PNSTs). In human MPNSTs, PTEN expression is often reduced, while EGFR expression is often induced. We tested if these two genes cooperate in the evolution of PNSTs. Transgenic mice were generated carrying conditional floxed alleles of Pten, and EGFR was expressed under the control of the 2′,3′-cyclic nucleotide 3′phosphodiesterase (Cnp) promoter and a desert hedgehog (Dhh) regulatory element driving Cre recombinase transgenic mice (Dhh-Cre). Complete loss of Pten and EGFR overexpression in Schwann cells led to the development of high-grade PNSTs. In vitro experiments using immortalized human Schwann cells demonstrated that loss of PTEN and overexpression of EGFR cooperate to increase cellular proliferation and anchorage-independent colony formation. This mouse model can rapidly recapitulate PNST onset and progression to high-grade PNSTs, as seen in sporadic MPNST patients. © 2012 Vincent W. Keng et al.

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