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Concentric sphere mie theory model: Applications to nanoshell spectra prediction and design of anti-reflection coatings for optical traps

Concentric sphere mie theory model: Applications to nanoshel...

引用

Biomedical Optics, BIOMED 2008

作者： Hu, Ying Nieminen, Timo A. Drezek, Rebekah A. Department of Bioengineering Rice University Houston TX 77005 United States Department of Electrical and Computer Engineering Rice University Houston TX 77005 United States Centre for Biophotonics and Laser Science School of Physical Sciences The University of Queensland Brisbane QLD 4072 Australia

We develop a Lorenz-Mie solution for multilayer concentric spheres and present two separate studies evaluating nanoshell spectra and anti-reflection coatings for improved optical trapping. © 2008 Optical Society ... 详细信息

关键词： Reflective coatings

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Constrained Coalitional Games and Networks of Autonomous Agents

Constrained Coalitional Games and Networks of Autonomous Age...

引用

3rd International Symposium on Communications, Control, and Signal Processing (ISCCSP 2008), vol.2

作者： John S. Baras Tao Jiang Punyaslok Purkayastha Institute for Systems Research Department of Electrical and Computer Engineering Department of Computer Science and Fischell Department of BioEngineering University of Maryland College Park MD USA

We develop a unifying analytical and optimization-based framework for the design, operation and performance evaluation of networks of dynamic autonomous agents. The fundamental view is that agents in such a network are dynamic entities that collaborate because via collaboration they can accomplish objectives and goals much better than working alone, or even accomplish objectives that they cannot achieve alone at all. Yet the benefits derived from such collaboration require some costs (e.g. communications), or equivalently, the collaboration is subject to constraints. Understanding and quantifying this tradeoff between the benefits vs the costs of collaboration, leads to new methods that can be used to analyze, design and control/operate networks of agents. Although the inspiration for the framework comes from social and economic networks, the fundamental ideas and in particular the methodology of dynamic constrained coalitional games (DCCG) can unify many concepts and algorithms for networks in various areas: social networks, communication networks, sensor networks, economic networks, biological networks, physics networks. We then analyze a specific instance of such tradeoffs arising in the design of security aware network protocols. We extend network utility maximization (NUM) so as to encompass security metrics such as "trust". The trust values assigned to nodes are based on interaction history and community-based monitoring. The effect of these trust values on the resulting protocols is that in routing and media access scheduling node trustworthiness is automatically considered and used. We develop a distributed algorithm for the joint physical-MAC-routing protocol design. Our extension to NUM with security concerns leads to resilient networks.

关键词： Coalitions Games Collaboration Security Network utility Cross-layer

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View-invariant full-body gesture recognition from video

View-invariant full-body gesture recognition from video

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作者： Peng, Bo Qian, Gang Rajko, Stjephan Arts Media and Engineering Program Arizona State University Tempe AZ 85287 United States Department of Electrical Engineering Arizona State University Tempe AZ 85287 United States Department of Computer Science and Engineering Arizona State University Tempe AZ 85287 United States

ISBN: (纸本)9781424421756

In this paper, we propose a video-based full-body gesture recognition system independent of the view angle of the cameras. We performed multilinear analysis on the silhouette images of the static poses making up the gestures by tensor decomposition and projection. Each pair of silhouette images is projected to a view-invariant low dimensional pose coefficient vector space. These pose vectors are then used as input vectors in hid- den Markov model (HMM) for gesture recognition. This system worked effectively in our experiments using real videos. © 2008 IEEE.

关键词： Gesture recognition

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Light scattering by white-emitting CdSe nanocrystals and traditional YAG:Ce3+ phosphor particles

Light scattering by white-emitting CdSe nanocrystals and tra...

引用

2008 MRS Fall Meeting

作者： Gosnell, Jonathan D. Weiss, Sharon M. Interdisciplinary Graduate Program in Materials Science Vanderbilt University Station B 350106 Nashville TN 37235 United States Department of Electrical Engineering and Computer Science Vanderbilt University Station B 351824 Nashville TN 37235 United States

ISBN: (纸本)9781615677740

In order for solid state lighting technology to become a mainstream technology, one of the major challenges to overcome is increasing the efficiency of these devices while maintaining a proper color balance. A significant source of efficiency loss in commercial phosphor-based white light-emitting diodes (LEDs) is light scattering off large, micron-sized phosphor particles. The use of recently reported single-size CdSe white-light nanocrystals in place of traditional phosphors, such as YAG:Ce3+, could lead to lower scattering losses and higher device efficiencies as a result of the extremely small CdSe core diameter of approximately 1.5 nm. This work theoretically and experimentally investigates the absorption, scattering, and extinction coefficients and cross sections of CdSe white-light nanocrystals in comparison to YAG:Ce3+ phosphor particles. Calculations were performed based on the Rayleigh approximation and Mie theory of scattering. Experiments were carried out using thin films of encapsulated nanocrystals. By measuring the absorbance and thickness of the films, in addition to the concentration of the nanocrystals, extinction coefficients and cross sections were determined using the Beer-Lambert law. A reasonable agreement was obtained between theoretical and experimental data showing that the size of the particle has a significant impact on the extinction, absorption, and scattering properties of thin films. The considerably reduced scattering from the nanocrystals compared to traditional phosphors, along with their inherent high quality white light emission, makes them a promising candidate for future solid state lighting applications. © 2009 Materials Research Society.

关键词： Cadmium compounds

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Design of fuzzy controller for automatic steering

Design of fuzzy controller for automatic steering

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作者： Ko, Sang-Jin Lee, Jun-Woo Choi, Byoung-Suk Lee, Ju-Jang Graduate School of Automobile Technology KAIST Daejeon Korea Republic of Robotics Program KAIST Daejeon Korea Republic of Department of Electrical Engineering and Computer Science KAIST Daejeon Korea Republic of

ISBN: (纸本)9784990288020

Unmanned vehicle is future vehicle technology. Lateral control technology and longitudinal control technology are needed for unmanned vehicle. Automatic steering system is lateral control technology. A automatic steering system automatically controls the steering to keep the vehicle in its land and also to follow the lane as it curves around. This paper proposes automatic steering system based on fuzzy logic. If the fuzzy rules are set properly, the fuzzy controller can control the objective system nicely. To design an automatic steering system, lateral error dynamics of a vehicle is derived. The proposed automatic steering system is evaluated by SIMULINK in MATLAB. The simulation results show that the proposed automatic steering system works satisfactorily for keeping the vehicle in its land and following the lane. ©ISAROB 2008.

关键词： Fuzzy control

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Stiffness control of 2-DOF exoskeleton for brain-machine interfaces

Stiffness control of 2-DOF exoskeleton for brain-machine int...

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IEEE/RAS-EMBS International Conference on Biomedical Robotics and Biomechatronics (BioRob)

作者： Rodolphe Heliot Amy Orsborn Jose M. Carmena Department of Electrical Engineering and Computer Science University of California Berkeley CA USA UCB/UCSF Joint Graduate Group in Bioengineering University of California Berkeley CA USA Department of Electrical Engineering and Computer Science Cognitive Science University of California Berkeley CA USA

Previous demonstrations of brain-machine interfaces have shown the potential for controlling a neuroprosthesis under pure motion control, i.e. predicting end effector kinematics from neural ensemble activity. For real world tasks, however, pure motion control lacks the information required for versatile manipulation in which the dynamic interactions of forces and torques between the musculoskeletal system and the environment play a crucial role. Thus, our current efforts aim at enabling a subject using a brain-machine interface to volitionally control the mechanical impedance of the prosthetic device. Here we propose the use of a two-link arm exoskeleton to investigate upper limb stiffness in non-human primates. We show that the device can be used to experimentally measure end-point limb stiffness, as well as to control the stiffness when the exoskeleton is used in slave-robot mode. Experimental results show that this platform allows for both stiffness measurement and control of the robotic device.

关键词： Exoskeletons Motion control Impedance Prosthetics Velocity control Kinematics Musculoskeletal system Biomedical measurements Robot control Actuators

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Interferometric synthetic aperture microscopy

Interferometric synthetic aperture microscopy

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OFC/NFOEC 2008 - 2008 Conference on Optical Fiber Communication/National Fiber Optic Engineers Conference

作者： Boppart, A. Ralston, Tyler S. Marks, Daniel L. Carney, P. Scott Beckman Institute for Advanced Science and Technology Department of Medicine 405 North Mathews Avenue Urbana IL 61801 United States Department of Electrical and Computer Engineering Department of Medicine 405 North Mathews Avenue Urbana IL 61801 United States Department of Bioengineering Department of Medicine 405 North Mathews Avenue Urbana IL 61801 United States

Interferometric synthetic aperture microscopy (ISAM) provides high-resolution three-dimensional optical images of highly-scattering samples with large depth-of-field without scanning the focal plane, ISAM can function... 详细信息

ISBN: (纸本)9781557528551

关键词： Synthetic apertures

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Robust Human Pose Recognition Using Unlabelled Markers

Robust Human Pose Recognition Using Unlabelled Markers

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IEEE Workshop on Applications of computer Vision (WACV)

作者： Yi Wang Gang Qian Department of Computer Science and Engineering Arizona State University USA Arts Media and Engineering Program and Department of Electrical Engineering Arizona State University USA

In this paper, we tackle robust human pose recognition using unlabelled markers obtained from an optical marker-based motion capture system. A coarse-to-fine fast pose matching algorithm is presented with the following three steps. Given a query pose, firstly, the majority of the non-matching poses are rejected according to marker distributions along the radius and height dimensions. Secondly, relative rotation angles between the query pose and the remaining candidate poses are estimated using a fast histogram matching method based on circular convolution implemented using the fast Fourier transform. Finally, rotation angle estimates are refined using nonlinear least square minimization through the Levenberg-Marquardt minimization. In the presence of multiple solutions, false poses can be effectively removed by thresholding the minimized matching scores. The proposed framework can handle missing markers caused by occlusion. Experimental results using real motion capture data show the efficacy of the proposed approach.

关键词： Robustness Humans Least squares approximation Labeling Clouds Art Fast Fourier transforms Image recognition computer science Biomedical optical imaging

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Photonic crystals: A platform for label-free and enhanced fluorescence biomolecular and cellular assays

Photonic crystals: A platform for label-free and enhanced fl...

引用

2008 MRS Fall Meeting

作者： Cunningham, Brian T. Chan, Leo Mathias, Patrick C. Ganesh, Nikhil George, Sherine Lidstone, Erich Heeres, James Hergenrother, Paul J. Department of Electrical and Computer Engineering University of Illinois at Urbana-Champaign Urbana IL 61801 United States Department of Bioengineering University of Illinois at Urbana-Champaign Urbana IL 61801 United States Department of Material Science and Engineering University of Illinois at Urbana-Champaign Urbana IL 61801 United States Department of Chemistry University of Illinois at Urbana-Champaign Urbana IL 61801 United States

ISBN: (纸本)9781615677672

Photonic crystal surfaces represent a class of resonant optical structures that are capable of supporting high intensity electromagnetic standing waves with near-field and far-field properties that can be exploited for high sensitivity detection of biomolecules and cells. While modulation of the resonant wavelength of a photonic crystal by the dielectric permittivity of adsorbed biomaterials enables label-free detection, the resonance can also be tuned to coincide with the excitation wavelength of common fluorescent tags - including organic molecules and semiconductor quantum dots. Photonic crystals are also capable of efficiently channeling fluorescent emission into a preferred direction for enhanced extraction efficiency. Photonic crystals can be designed to support multiple resonant modes that can perform label free detection, enhanced fluorescence excitation, and enhanced fluorescence extraction simultaneously on the same device. Because photonic crystal surfaces may be inexpensively produced over large surface areas by nanoreplica molding processes, they can be incorporated into disposable labware for applications such as pharmaceutical high throughput screening. In this talk, the optical properties of surface photonic crystals will be reviewed and several applications will be described, including results from screening a 200,000-member chemical compound library for inhibitors of protein-DNA interactions, gene expression microarrays, and high sensitivity of protein biomarkers. © 2009 Materials Research Society.

关键词： Photonic crystals

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Abandoned object position prediction based on mobile robot

Abandoned object position prediction based on mobile robot

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International Conference on Control, Automation and Systems ( ICCAS)

作者： Soung Min Im Ju Jang Lee Robotics program KAIST Daejeon South Korea Department of Electrical Engineering and Computer Science KAIST Daejeon South Korea

Visual surveillance with dynamic background is one of the most active research topics in computer vision. Especially, researches for abandoned detection in the public place have been caused by preventing terror and accident. Previous researches for abandoned detection have been based on a static image and used an image difference. In this paper we present an algorithm for a mobile robot and we use optical flow for detecting a static object and distances from abandoned objects. For this purpose, we find abandoned objects and predict a position of objects using a mobile robot visual system with a single camera.

关键词： Mobile robots Surveillance computer vision Accidents Image motion analysis Object detection Optical detectors Visual system Robot vision systems Cameras

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