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2014 11th World Congress on Intelligent Control and Automation, WCICA 2014

作者： Jiang, Guolai Syed, Muhammad Umer Liu, Letian Ou, Yongsheng Xu, Yangsheng Malik, Muhammad Sarfaraz Chandio, Aftab Ahmed Center for Intelligent and Biomimetic Systems Institute of Advanced Integration Technology Chinese Academy of Sciences Guangdong China Department of Mechanical and Automation Engineering Chinese University of Hong Kong Hong Kong Lab of Simulation and Intelligent Control University of Science and Technology of China Heife China Center for Cloud Computing Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences China

ISBN: (纸本)9781479958252

Localization of an autonomous mobile robot has always been a topic of interest in Robotics community. The constraints of working under different environments are constantly a challenge in designing an efficient localization system. We propose a localization algorithm for a mobile robot, which will be used for home security. The objective is to perform indoor localization efficiently and keeping the cost as low as possible so as to make it commercializable. Here, we introduce an approach based on recognizing a pattern generated by laser pointers on the wall, which is captured by an infrared camera. The image of this pattern is used to locate the position of a robot in the room. The problem of working under black ceiling has been overcomed because the projection is on the wall and is moving which also increases the range of operation. As the pattern is unique, the interference of strong sunlight has also been fixed to some extent. Experimental results show that the proposed approach is effective in real environment and opens new doors for future research. © 2014 IEEE.

关键词： Indoor positioning systems

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Unidirectional phase singularity in ultrathin metamaterials at exceptional points

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Physical Review A 2014年第6期89卷 065801-065801页

作者： Ming Kang Hai-Xu Cui Teng-Fei Li Jing Chen Weiren Zhu Malin Premaratne College of Physics and Materials Science Tianjin Normal University Tianjin 300387 China MOE Key Laboratory of Weak-Light Nonlinear Photonics School of Physics Nankai University Tianjin 300071 China Advanced Computing and Simulation Laboratory (AχL) Department of Electrical and Computer Systems Engineering Monash University Clayton Victoria 3800 Australia

Scattering properties of light in metamaterials are similar to those in open quantum systems. Here we propose an ultrathin tailored metamaterial designed to show that one-way zero reflection yielding to topologically stable phase dislocation is responsible for the exceptional point, one of the most important degeneracies in the non-Hermitian Hamiltonian. In order to bridge the exotic macroscopic optical phenomenon occurring in metamaterials, a phenomenological model under microscopic view is developed and good agreement with the full-blown numerical simulation is found. Our investigation uncovers the capabilities of metamaterials to exhibit extreme optical properties and to provide us with many potential applications such as the suppression of undesired scattering signals in the spectral band ranging from microwaves to visible light.

关键词： Metamaterials

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An Extensible Digital Library Service to Support Network Science

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Procedia Computer Science 2013年 18卷 419-428页

作者： S.M. Shamimul Hasan Keith Bisset Edward A. Fox Kevin Hall Jonathan P. Leidig Madhav V. Marathe Department of Computer Science Virginia Tech Blacksburg VA 24061 USA Network Dynamics and Simulation Science Laboratory VBI Virginia Tech Blacksburg VA 24061 USA School of Computing & Information Systems Grand Valley State University Allendale MI 49401 USA

Network science research aims to understand the underlying properties of complex networks. Large-scale modeling and simulation is the core of network science research. Existing systems take a long time to run large network science experiments with high performance computing resources. Scientific data management systems currently lack the performance efficiency needed to support this type of computation and data-intensive research. Memoization provides the ability to index, archive, and reuse frequently requested and expensive to re-compute datasets. In this paper, a domain independent memoization service to increase the computational execution process performance within cyberinfrastructure-based systems is described. The service is formulated as an extensible memoization framework for the computational and simulation network science domains that is built on top of well-defined metadata objects. We present extensible concepts, discuss the proposed algorithm and framework architecture, and examine the flexible nature of the framework. The framework was utilized as a part of the CINET cyberinfrastructure-based digital library (DL). Our experimental results indicate an increase in the efficiency of the system and recommendation of the service's inclusion in scientific DLs.

关键词： Algorithm Cyberinfrastructure Memoization Network Science

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From laptops to supercomputers: a single highly scalable code base for spiking neuronal network simulations

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BMC Neuroscience 2013年第1期14卷 1-2页

作者： Susanne Kunkel Abigail Morrison Markus Diesmann Maximilian Schmidt Jochen M Eppler Moritz Helias Hans E Plesser Jun Igarashi Tomoki Fukai Gen Masumoto Shin Ishii Simulation Laboratory Neuroscience - Bernstein Facility Simulation and Database Technology Institute for Advanced Simulation Jülich Aachen Research Alliance Jülich Research Centre Germany Institute of Neuroscience and Medicine (INM-6) and Institute for Advanced Simulation (IAS-6) Jülich Research Centre and JARA Germany Bernstein Center Freiburg Albert-Ludwig University of Freiburg Germany Institute of Cognitive Neuroscience Faculty of Psychology Ruhr-University Bochum Germany Medical Faculty RWTH University Aachen Germany Laboratory for Neural Circuit Theory RIKEN Brain Science Institute Wako Japan Department of Mathematical Sciences and Technology Norwegian University of Life Sciences Aas Norway High-Performance Computing Team RIKEN Computational Science Research Program Kobe Japan Integrated Systems Biology Laboratory Department of Systems Science Graduate School of Informatics Kyoto University Japan

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Metamaterial absorbers realized in an X-band rectangular waveguide

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Chinese Physics B 2012年第11期21卷 474-478页

作者：黄勇军文光俊李建钟靖平王平孙元华 O.Gordon 朱卫仁 Key Laboratory of Broadband Optical Fiber Transmission&Communication Networks School of Communication and Information EngineeringUniversity of Electronic Science and Technology of China Advanced Computing and Simulation Laboratory(AχL) Department of Electrical and Computer Systems EngineeringMonash University

In this paper, we demonstrate six types of metamaterial absorbers （MMAs） by measuring their absorptivities in an X-band （8 12 GHz） rectangular waveguide. Some of the MMAs have been demonstrated previously by using the free space measurement method, and the others are proposed firstly in this paper. The measured results show that all of the six MMAs exhibit high absorptivities above 98%, which have similar absorbing characteristics to those measured in the free space. The numerically obtained surface current densities for each MMA show that the absorbing mechanism is the same as that under the free space conditions. Such a demonstration method is superior to the conventional free space measurement method due to the small-scale test samples required, the simple measure device, and its low cost. Most importantly, the proposed method opens a way to enable MMAs to be used in microwave applications such as matched terminations.

关键词： metamaterial absorber electric resonator rectangular waveguide

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Partially coherent light interaction with nano objects

Partially coherent light interaction with nano objects

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International Conference on Transparent Optical Networks

作者： Malin Premaratne Advanced Computing and Simulation Laboratory (AxL) Department of Electrical and Computer Systems Engineering (ECSE) Monash University Clayton VIC Australia

Scattering of fully coherent light from nano objects is a very matured field with plethora of applications. However, due to various fundamental and operational reasons, fluctuations in various characteristic features of interacting light fields cannot be fully suppressed. Such light fields with random fluctuating features are known as partially coherent light. When partially coherent light interact with nano-objects (i.e. solids or voids), new characteristics emerge (e.g. coherence vortex, fully-incoherent point-pairs) that are absent in fully coherent scattered fields. In this paper, we review the fundamental metrics for characterising partially coherent light and how such metrics can be used to reveal some of the hidden features of partially coherent light interacting with nano-objects.

关键词： Coherence Optical scattering Optical vortices Optical sensors Optical beams Optical polarization Biomedical optical imaging

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A fresh look at the validity of the diffusion approximation for modeling fluorescence spectroscopy in biological tissue

A fresh look at the validity of the diffusion approximation ...

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Annual International Conference of the IEEE Engineering in Medicine and Biology Society

作者： Chintha Chamalie Handapangoda Malin Premaratne Saeid Nahavandi with the Centre for Intelligent Systems Research Deakin University Geelong Victoria 3217 Australia with the Advanced Computing and Simulation Laboratory (A_XL) Department of Electrical and Computer Systems Engineering Monash University Clayton Victoria 3800 Australia malin.

ISBN: (纸本)9781424441198

Fluorescence has become a widely used technique for applications in noninvasive diagnostic tissue spectroscopy. The standard model used for characterizing fluorescence photon transport in biological tissue is based on the diffusion approximation. On the premise that the total energy of excitation and fluorescent photon flows must be conserved, we derive the widely used diffusion equations in fluorescence spectroscopy and show that there must be an additional term to account for the transport of fluorescent photons. The significance of this additional term in modeling fluorescence spectroscopy in biological tissue is assessed.

关键词： approximation fluorescence applications

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Tunable metamaterials based on ferrites and the applications

Tunable metamaterials based on ferrites and the applications

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International Workshop on Metamaterials

作者： Yongjun Huang Guangjun Wen Weiren Zhu School of Communication and Information Engineering University of Electronic Science and Technology of China Chengdu China Advanced Computing and Simulation Laboratory (AxL) Department of Electrical and Computer Systems Engineering Monash University Clayton VIC Australia

The research of metamaterial is one of most important global activity that promises to change the lives in many different ways. Flexibly controlling the properties of metamaterials by tunable designs makes metamaterials more colorful and thus enables a family of new electromagnetic devices. In this paper, the use of ferrites on design of tunable metamaterials has been reviewed. Owing to the novel properties of ferrites, including broadband negative permeability and tunability of permeability, a great many researchers have focused on investigating ferrites based metamaterials and the relevant applications. This paper reviews the design, theoretical analysis, numerical and experimental demonstrations, and the potential applications of the ferrite based metamaterials.

关键词： Metamaterials Ferrites Wires Permeability Magnetic resonance Helium

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Determination of the effective constitutive parameters of active transmission line metamaterials

Determination of the effective constitutive parameters of ac...

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International Workshop on Metamaterials

作者： Li-Ming Si Weiren Zhu Xin Lv Beijing Key Laboratory of Millimeter Wave and Terahertz Technology Department of Electronic Engineering School of Information and Electronics Beijing Institute of Technology Beijing China Advanced Computing and Simulation Laboratory (AxL) Department of Electrical and Computer Systems Engineering Monash University Clayton VIC Australia

This paper presents an alternative approach, based on the transmission line theory, for determination of the attenuation constant (α), phase constant (β), characteristic impedance (Zo), refractive index (n), effective permittivity (ε) and effective permeability (μ) for active transmission line (TL) metamaterial. When active elements are introduced into the lossy TL meta-material, the gain acquired from the active elements should be evaluated quantitatively against the attenuation due to the loss in order to avoid ambiguities in determining the signs of the effective constitutive parameters. In stead of directly determining the characteristic impedance from S-parameters, we introduce the reflection coefficient as an intermediate quantity to assist solving the characteristic impedance. This paper shows demonstration of this method with an example of active TL metamaterial.

关键词： Metamaterials Impedance Refractive index Attenuation Magnetic materials Permeability

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Tunable ferrite based triple-band μ-negative metamaterial

Tunable ferrite based triple-band μ-negative metamaterial

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Asia Communications and Photonics Conference and Exhibition (ACP)

作者： Haibin Sun Guangjun Wen Yongjun Huang Jingping Zhong Weiren Zhu Key Laboratory of Broadband Optical Fiber Transmission & Communication Networks School of Communication and Information Engineering University of Electronic Science and Technology Chengdu China Advanced Computing and Simulation Laboratory (AxL) Department of Electrical and Computer Systems Engineering Monash University Clayton VIC Australia

We present a tunable triple-band μ-negative metamaterial composed of loop resonator and ferrite. The tunable triple-band-stop transmission spectrum of such metamaterial is investigated numerically by full wave simulations. Moreover, the corresponding effective parameters are retrieved to illustrate the tunable μ-negative characteristic.

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