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2011 5th International Conference on Innovative Mobile and Internet Services in Ubiquitous Computing, IMIS 2011

作者： Xin, Qin Yao, Xiaolan He, Wei Universite Catholique de Louvain Department of Applied Mathematics Louvain-la-Neuve Belgium National University of Defense Technology School of Computer Science Changsha China State Key Laboratory of Power Transmission Equipment and System Security and New Technology College of Electrical Engineering Chongqing University China

ISBN: (纸本)9780769543727

In a Wireless Sensor Networks (WSN), there are normally one or several sensor nodes working as Access Points (AP), which are able to provide a relay for other sensors to an external Internet connection. Since WSNs are resource-constrained, the selection of APs is very crucial in economizing power usage. In this paper, we study the optimal selection of APs to maximize the WSN lifetime. This issue is closely related to routing protocols in WSN. We propose a new adaptive multi-path routing protocol to reduce the energy consumption and guarantee QoS requirements with respect to transmission delay. In this paper, we formulate the issues we mentioned above as a non-linear NP-hard optimization problem. Due to the high computation complexity of this problem, we proposed two polynomial-time approximation algorithms to optimally select APs in the WSN that based on the framework in [41]. Combining with our new adaptive multi-path routing protocol, our preliminary simulation results show that our schemes can save more than 20% energy compared with the existing APs selection schemes with single-path routing protocols. © 2011 IEEE.

关键词： Routing protocols

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Local positioning systems for mobile devices based on ontology

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Information Technology Journal 2011年第1期10卷 168-174页

作者： Gao, Honghao Wang, Shuoping Lu, Hongquan School of Computer Engineering and Science Shanghai University Shanghai 200072 China Computer Science School Zhejiang University City College Hangzhou 310015 China 3Institutes of Applied Mathematics and Mechanics Shanghai University Shanghai 200072 China

In order to get services continuity and integrity in wide range of pervasive environments for mobile computing devices, Local Positioning Systems (LPS), recognized as the key prerequisite of dependability for many fundamental network services, has attracted a lot of research efforts in recent years. This study attempts to propose a method, based on Ontology using Jena to implement the context awareness technology, for local positioning systems to facilitate effective communications and service applications. First of all, the study introduces Local Positioning Systems in relation to the modern daily life and then the paper expounds on the context-related elements in the locating process. Secondly, the semantic by formal method based on Ontology for efficient application of services is analyzed. Thirdly, the paper proposes a model for mobile devices and gives a connective workflow example. In conclusion, the experiments show that the proposed approach is an improvement to conventional practices. © 2011 Asian Network for Scientific Information.

关键词： Semantics

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WOX5-IAA17 feedback circuit mediated cellular auxin response is crucial for Arabidopsis root patterning

WOX5-IAA17 feedback circuit mediated cellular auxin response...

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2012全国植物生物学大会

作者： Krzysztof Wabnik Zhaojun Ding Huiyu Tian Hanbing Li Stephan Pollmann Steffen Vanneste Willy Govaerts Jakub Rol(c)ík Markus Geisler Ji(r)í Friml Department of Plant Systems Biology VIB and Department of Plant Biotechnology and GeneticsGhent University B-9052 Gent Belgium Department of Biochemistry University of Missouri Columbia MO USA Laboratory of Growth Regulators Centre of the Region Haná for Biotechnological and Agricultural Research and Faculty of Science Palack(y) University 78371 Olomouc Czech Republic The Key Laboratory of Plant Cell Engineering and Germplasm Innovation Ministry of EducationSchool of Life Sciences Shandong University Shanda Nanlu 27 Jinan 250100 China Department of Applied Mathematics and Computer Science Ghent University 9000 Gent Belgium Department of Biology Plant Biology University of Fribourg 1700 Fribourg Switzerland Ruhr-Universit(a)t Bochum Lehrstuhl für Pflanzenphysiologie 44801 Bochum Germany

In plants, the patterning of root meristem requires a gradient-guided auxin maximum that depends on the concerted action of polar auxin transport, auxin biosnythesis and intracellular auxin homeostasis.

关键词： WOX5 auxin IAA17/AXR3 root patterning computer simulation

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Minimum time control of helicopter UAVs using computational dynamic optimization

Minimum time control of helicopter UAVs using computational ...

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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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