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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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Size and composition dependence of melting temperature of binary nanoparticles

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Science China(Physics,Mechanics & Astronomy) 2011年第5期54卷 897-900页

作者： LU YunBin LIAO ShuZhi XIE Bin CHEN Jia PENG HaoJun ZHANG Chun ZHOU HuiYing XIE HaoWen OUYANG YiFang ZHANG BangWei Key Laboratory of Low Dimensional Quantum Structures and Quantum Control of Ministry of Education Department oy rnystcs Hunan Normal University Changsha 410081 China College of Mathematics and Physics University of South China Hengyang 421001 China College of Mathematics and Computer Science Hunan Normal University Changsha 410081 China Computer and Information Engineering School Central South University of Forestry and Technology Changsha 410004 China Department of Physics Guangxi University Nanning 530004 China Department of Applied Physics Hunan University Changsha 410082 China International Centre for Materials Physics Chinese Academy of Sciences Shenyang 110015 China

Based on the ideal solution approximation, the model for size-dependent melting temperature of pure metal nanoparticles is extended to binary alloy systems. The developed model, free of any adjustable parameter, demonstrates that the melting temperature is related to the size and composition of alloy nanoparticles. The melting temperature of CuNi, PbBi and Snln binary alloy nanocrystals is found to be consistent with the experiments and molecular dynamics simulations. The research reveals that alloy nanocrystals have similar melting nature as pure metal.

关键词： nano binary alloy melting temperature size-dependent

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Novel Chaotic Behaviors and Evolutions for the Nonlinear(3+1)-Dimensional Burgers System

Novel Chaotic Behaviors and Evolutions for the Nonlinear(3+1...

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The 2011 International Symposium on Manufacturing Systems engineering (ISMSE 2011)

作者： Bangqing Li Yulan Ma Meiping Xu School of Mechanical Electronic and Information Engineering China University of Mining and Technology(Beijing) Department of Computer Science and Engineering Beijing Technology and Business University Department of Applied Mathematics Beijing Technology and Business University

Based on the non-traveling wave solution and a chemical chaos system, chaotic soliton excitations are established for the nonlinear(3+1)-dimensional Burgers system. The chaotic behavior and chaotic evolution of the sy... 详细信息

关键词： nonlinear(3+1)-dimensional Burgers system,non-traveling wave solution,chemical chaos system,chaotic behavior,chaotic evolution

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Context Parsing, Processing and Distribution in Clouds

Context Parsing, Processing and Distribution in Clouds

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International Conference on Intelligent Networking and Collaborative Systems (INCOS)

作者： Saad Liaquat Kiani Ashiq Anjum Nik Bessis Richard Hill Michael Knappmeyer Faculty of Engineering and Technology University of West of England Bristol UK School of Computing and Mathematics University of Derby Derby UK Faculty of Engineering and Computer Science University of Applied Sciences Osnabrück Osnabruck Germany

Context is information that describes the situations in which computing, social and physical interactions take place. The complexity and scope of context information available for utilization by context-consuming applications, such as those executing on smart mobile devices, sensing and tracking platforms, etc. is growing with the increased integration of digital artifacts in smart environments. Similarly, the uptake of Cloud computing has significantly influenced the traditional information processing and infrastructure provision models by offering an agile, scalable and cost effective computing paradigm. This is leading to the adoption of Cloud-based solutions for the pervasive and ubiquitous environments, however, there are significant challenges that need to be overcome before its exploitation by real world applications and users. The context information consumed and produced by the applications and devices needs to be represented, disseminated, processed and consumed by numerous components in a context-aware Cloud system. Significant amount of context consumption, production and processing takes place on devices and there is limited or no support for collaborative modeling, persistence and processing between the device-Cloud ecosystems. In this paper we propose an environment for context processing in a Cloud-based distributed infrastructure that offloads complex context processing from the applications and devices. An experimental analysis of complexity based context-processing categories has been carried out to establish the processing-load boundary. The results demonstrate that the proposed collaborative device-Cloud infrastructure provides significant performance and energy conservation benefits for mobile devices and applications.

关键词： Context XML Mobile handsets Complexity theory Context modeling Subscriptions computer architecture

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Random Access to Grammar-Compressed Strings 11

Random Access to Grammar-Compressed Strings

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Annual ACM-Society for Industrial and applied Mathmatics Symposium on Discrete Algorithms

作者： Philip Bille Gad M. Landau Rajeev Raman Kunihiko Sadakane Srinivasa Rao Satti Oren Weimann Department of Computer Science University of Haifa DTU Informatics Technical University of Denmark Department of Computer Science University of Leicester National Institute of Informatics School of Computer Science and Engineering Seoul National University Department of Computer Science and Applied Mathematics Weizmann Institute of Science

ISBN: (纸本)9780898719932

Let S be a string of length N compressed into a context- free grammar S of size n. We present two representations of S achieving O(logN) random access time, and either O(n·α_k(n)) construction time and space on the pointer machine model, or O(n) construction time and space on the RAM. Here, α_k(n) is the inverse of the kth row of Ackermann's function. Our representations also efficiently support decompression of any substring in S: we can decompress any substring of length m in the same complexity as a single random access query and additional O(m) time. Combining these results with fast algorithms for uncompressed approximate string matching leads to several efficient algorithms for approximate string matching on grammar-compressed strings without decompression. For instance, we can find all approximate occurrences of a pattern P with at most k errors in time O(n(min{|P|k, k~4+|P|}+logN)+occ), where occ is the number of occurrences of P in S. Finally, we are able to generalize our results to navigation and other operations on grammar-compressed trees. All of the above bounds significantly improve the currently best known results. To achieve these bounds, we introduce several new techniques and data structures of independent interest, including a predecessor data structure, two "biased" weighted ancestor data structures, and a compact representation of heavy-paths in grammars.

关键词： RANDOM ACCESS String matching Decompression Cosmic strings substring machine model Sulfur syntax Data structures

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Observer Based Delay-Dependent Robust H∞ Control of Nonlinear Uncertain Systems with State and Input Delays

Observer Based Delay-Dependent Robust H∞ Control of Nonline...

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2011 China Control and Decision Conference(2011中国控制与决策会议 CCDC)

作者： Miaoxin Wang Xinzhi Liu Jizhen Liu Miaomiao Ma School of Control and Computer Engineering North China Electric Power University Beijing 102206Ch Department of Applied Mathematics University of Waterloo Waterloo Ontario Canada N2L3G1 School of Control and Computer Engineering North China Electric Power University Beijing 102206 C School of Control and Computer Engineering North China Electric Power University Beijing 102206

Observer-based delay-dependent robust H∞ controller design problem for state and input time-delays systems with a class of nonlinear uncertainties is discussed in this paper. Assuming that the nonlinear uncertain functions in the considered model are gain-bounded, we obtain a sufficient condition for robustly asymptotic stability and H∞ performance of the closed-loop system in the light of Lyapunov stability theory. By solving a pair of linear matrix inequalities (LMIs), we construct delay-dependent state feedback control law which guarantees robustly asymptotic stability of the closed-loop system and reduce the effect of the disturbance input on the controlled output to a prescribed level. The delay-bounds and the H performance bound can be optimized. A numerical example is given to illustrate our results.

关键词： Nonlinear uncertain systems State and input delays Delay-dependent Robust H control Observer LMI

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Intrinsic noise induced state transition in coupled positive and negative feedback genetic circuit

Intrinsic noise induced state transition in coupled positive...

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IEEE International Conference on Systems Biology

作者： Pei Wang Jinhu Lü Yuhuan Zhang Maciej J. Ogorzalek School Mathematics Statistics Wuhan University Wuhan China School Electrical Comput. Engineering RMIT University Australia Acad. Mathematics System Science Chinese Academy of Sciences (CAS) Beijing China School Mathematics Science Capital Normal University Beijing China Faculty Physics Astron. Applied Computer Science Jagiellonian University Krakow Poland

It is well known that gene regulatory circuits can be modeled by the deterministic or stochastic approach. In this paper, a three-component coupled positive and negative feedback genetic circuit is firstly modeled deterministically by Hill kinetics. Then, a corresponding stochastic model is also investigated by using Gellispie's stochastic simulation. Some typical dynamical behaviors of the genetic circuit are further discussed based on the bifurcation analysis of deterministic system, including monostability, bistability, excitability, and oscillation. This paper aims to further investigate the effect of intrinsic noise inherently in stochastic models on steady states transition. It includes: i) For the parameters in deterministically bistable region, intrinsic noise may induce bistable switch for the not too large system volume, which can be observed by the generation of a new stable steady state; ii) For the parameters in deterministically excitable region, intrinsic noise may induce periodic switch for the very large system volume, which can be observed by the stabilization of another unstable steady state and the switching between two stable states; iii) When time delays are introduced in these two models, similar phenomena can be observed. The above results will certainly increase the understanding of the inner relationships between different modeling for the genetic circuit. It sheds some light on the real- world engineering applications, such as the engineering design of synthetic circuits.

关键词： Stochastic processes Steady-state Mathematical model Noise Bifurcation Switches Oscillators

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Nash Equilibrium and Saddle Points for Multifunctions

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Communications in Mathematical Analysis 2011年第2期10卷 118-127页

作者： Pando G. Georgiev Tamaki Tanaka Daishi Kuroiwa Panos M. Pardalos Center for Applied Optimization University of Florida Gainesville FL 32611 USA Graduate School of Science and Technology Niigata University Niigata 950-2181 Japan Department of Mathematics and Computer Science Interdisciplinary Faculty of Science and Engineering Shimane University Matsue 690-8504 Japan

We introduce new definitions of semi-continuity for multifunctions, combining the topological and the ordered structure of a Banach space induced by a closed convex cone. We prove two types Nash equilibrium theorems for multifunctions using scalarization and the Ky Fan’s inequality. As corollaries we obtain saddle point theorems for convex-concave multifunctions, which can be considered as generalization to the vector-valued set-valued case of the Von Neumann minimax theorem.

关键词： 46020 minimax Nash equilibrium saddle points semi-continuity set-valued mappings

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RF extraction of self-heating effects in FinFETs of various geometries

RF extraction of self-heating effects in FinFETs of various ...

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Topical Meeting on Silicon Monolithic Integrated Circuits in RF Systems

作者： Sergej Makovejev Sarah Olsen Jean-Pierre Raskin School of Electrical Electronic and Computer Engineering University of Newcastle Newcastle-upon-Tyne UK Institute of Information and Communication Technologies Electronics and Applied Mathematics Université catholique de Louvain Louvain-la-Neuve Belgium

Dynamic self-heating effect is characterised in n-channel FinFETs on Silicon-on-Insulator (SOI) platform. RF extraction technique is discussed and dependence of thermal resistance on fin width, number of parallel fins... 详细信息

关键词： Thermal resistance FinFETs Logic gates Capacitance Radio frequency Heating

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Solving Constrained Optimization Problems by an Improved Particle Swarm Optimization

Solving Constrained Optimization Problems by an Improved Par...

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International Conference on Innovations in Bio-inspired Computing and Applications (IBICA)

作者： Chaoli Sun Jianchao Zeng Shuchuan Chu John F. Roddick Jengshyang Pan Complex System and Computational Intelligence Laboratory Taiyuan University of Science and Technology Taiyuan Shanxi China School of Computer Science Engineering and Mathematics Flinders University Australia Department of Electronic Engineering National Kaohsiung University of Applied Sciences Kaohsiung Taiwan

Constrained optimization problems compose a large part of real-world applications. More and more attentions have gradually been paid to solve this kind of problems. An improved particle swarm optimization (IPSO) algorithm based on feasibility rules is presented in this paper to solve constrained optimization problems. The average velocity of the swarm and the best history position in the particle's neighborhood are introduced as two turbulence factors, which are considered to influence the fly directions of particles, into the algorithm so as not to converge prematurely. The performance of IPSO algorithm is tested on 13 well-known benchmark functions. The experimental results show that the proposed IPSO algorithm is simple, effective and highly competitive.

关键词： Optimization Particle swarm optimization Algorithm design and analysis Convergence History Educational institutions

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