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Biomimetics: Biomimetic Microfingerprints for Anti‐Counterfeiting Strategies (Adv. Mater. 12/2015)

Advanced Materials 2015年第12期27卷

作者： Hyung Jong Bae Sangwook Bae Cheolheon Park Sangkwon Han Junhoi Kim Lily Nari Kim Kibeom Kim Suk‐Heung Song Wook Park Sunghoon Kwon Department of Electrical and Computer Engineering Seoul National University Gwanak‐ro Gwanak‐gu Seoul 151‐744 South Korea Center for Nanoparticle Research Institute for Basic Science (IBS) Seoul National University Gwanak‐ro Gwanak‐gu Seoul 151‐744 South Korea Institute of Entrepreneurial Bio Convergence Seoul National University Gwanak‐ro Gwanak‐gu Seoul 151‐744 South Korea Interdisciplinary Program for Bioengineering Seoul National University Gwanak‐ro Gwanak‐gu Seoul 151‐744 South Korea Department of Electronics and Radio Engineering Institute for Laser Engineering Kyung Hee University Deongyeong‐daero Giheung‐gu Yongin‐si Gyeonggi‐do 446‐701 South Korea

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Carbon Nanospheres: Tunable Luminescent Carbon Nanospheres with Well-Defined Nanoscale Chemistry for Synchronized Imaging and Therapy (Small 36/2015)

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Small 2015年第36期11卷

作者： Prabuddha Mukherjee Santosh K. Misra Mark C. Gryka Huei-Huei Chang Saumya Tiwari William L. Wilson John W. Scott Rohit Bhargava Dipanjan Pan Department of Bioengineering University of Illinois at Urbana-Champaign 1304 W. Springfield Ave. Urbana IL 61801 USA Department of Chemistry University of Illinois at Urbana-Champaign 600 S. Mathews Ave. Urbana IL 61801 USA Materials Research Laboratory University of Illinois at Urbana-Champaign Urbana IL 61801 USA Illinois Sustainability Technology Center University of Illinois at Urbana-Champaign Urbana IL 61801 USA Electrical and Computer Engineering Chemical and Biomolecular Engineering Chemistry and Mechanical Science and Engineering Beckman Institute for Advanced Science and Technology University of Illinois at Urbana-Champaign 1304 W. Springfield Ave. Urbana IL 61801 USA Carle Foundation Hospital 502 N. Busey St. Urbana IL 61801 USA Departments of Bioengineering and Materials Science and Engineering 502 N. Busey St. Urbana IL 61801 USA Beckman Institute for Advanced Science and Technology University of Illinois at Urbana-Champaign Urbana IL 61801 USA

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Relay selection for AF wireless relay networks in adverse communication environments

Relay selection for AF wireless relay networks in adverse co...

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Asilomar Conference on Signals, Systems & computers

作者： Kanghee Lee Visvakumar Aravinthan Sunghoon Moon Jongbum Ryou Changki Moon Inha Hyun Sun Jo Information & Communications Office Air Force Headquarters Gyeryong Korea Wichita State University Wichita KS US Department of Electrical Engineering and Computer Science Wichita State University Wichita Kansas 3C4ISR Division Defense Acquisition Program Administration of ROK Seoul Korea

ISBN: (纸本)9781479982981

This paper addresses wireless relay networks consisting of a one-source-one-destination pair and N noncooperative relays. An objective of this paper is to analytically derive a closed form of an optimal relay amplifying vector (or matrix) for an amplify-and-forward (AF) wireless relay network under channel uncertainty (CU), jamming, and transmission power constraints at the relays, using the minimum mean square error (MMSE) criterion. In addition, this paper presents an efficient relay-selection strategy using the maximum SNR and minimum MMSE cost function criterions under an adverse wireless communication environment with transmission power constraint at the relays.

关键词： Signal to noise ratio Wireless communication Cost function Relay networks (telecommunications) Bit error rate Wireless sensor networks

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Cerulean: A hybrid assembly using high throughput short and long reads

Cerulean: A hybrid assembly using high throughput short and ...

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13th Workshop on Algorithms in Bioinformatics, WABI 2013

作者： Deshpande, Viraj Fung, Eric D. K. Pham, Son Bafna, Vineet Department of Computer Science and Engineering University of California San Diego CA United States Bioinformatics Undergraduate Program Department of Bioengineering University of California San Diego CA United States

ISBN: (纸本)9783642404528

Genome assembly using high throughput data with short reads, arguably, remains an unresolvable task in repetitive genomes, since when the length of a repeat exceeds the read length, it becomes difficult to unambiguously connect the flanking regions. The emergence of third generation sequencing (Pacific Biosciences) with long reads enables the opportunity to resolve complicated repeats that could not be resolved by the short read data. However, these long reads have high error rate and it is an uphill task to assemble the genome without using additional high quality short reads. Recently, Koren et al. 2012 [1] proposed an approach to use high quality short reads data to correct these long reads and, thus, make the assembly from long reads possible. However, due to the large size of both dataset (short and long reads), error-correction of these long reads requires excessively high computational resources, even on small bacterial genomes. In this work, instead of error correction of long reads, we first assemble the short reads and later map these long reads on the assembly graph to resolve repeats. Contribution: We present a hybrid assembly approach that is both computationally effective and produces high quality assemblies. Our algorithm first operates with a simplified version of the assembly graph consisting only of long contigs and gradually improves the assembly by adding smaller contigs in each iteration. In contrast to the state-of-the-art long reads error correction technique, which requires high computational resources and long running time on a supercomputer even for bacterial genome datasets, our software can produce comparable assembly using only a standard desktop in a short running time. © 2013 Springer-Verlag.

关键词： Error correction

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Preliminary study of digital image correlation based optical coherence elastography

Preliminary study of digital image correlation based optical...

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European Conference on Biomedical Optics, ECBO 2013

作者： Sun, Cuiru Vuong, Barry Wen, Xiao-Yan Yang, Victor Biophotonics and Bioengineering Laboratory Ryerson University Toronto ON Canada Department Electrical and Computer Engineering Ryerson University Toronto ON Canada Department Medicine University of Toronto Toronto ON Canada Department Electrical and Computer Engineering University of Toronto Toronto ON Canada Division of Neurosurgery Sunnybrook Health Science Center Toronto ON Canada

ISBN: (纸本)9780819496461

Optical coherence elastography (OCE) provides deformation or material properties mapping of soft tissue, which is important for morphological and pathological studies of the tissue. An OCE technique is developed based on digital image correlation. System calibration and measurement error evaluation are performed. The displacement measurement of 0.6 μm to over 100 μm was obtained through a phantom experiment. The capability of this OCE technique for differentiation of stiffness was evaluated by imaging a two-components phantom. OCE imaging of an aneurysm sample shows promising results for characterization of composites of aneurismal wall in the future. © OSA-2013 SPIE.

关键词： Optical tomography

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Self-assembly of skyrmion-dressed chiral nematic colloids with tangential anchoring

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Physical Review E 2014年第6期89卷 060502(R)-060502(R)页

作者： M. B. Pandey T. Porenta J. Brewer A. Burkart S. Čopar S. Žumer Ivan I. Smalyukh Department of Physics and Liquid Crystal Materials Research Center University of Colorado Boulder Colorado 80309 USA Department of Physics VSSD College Kanpur 208 002 India Faculty of Mathematics and Physics University of Ljubljana Jadranska 19 1000 Ljubljana Slovenia Jozef Stefan Institute Jamova 39 1000 Ljubljana Slovenia Department of Electrical Computer and Energy Engineering and Materials Science and Engineering Program University of Colorado Boulder Colorado 80309 USA Renewable and Sustainable Energy Institute National Renewable Energy Laboratory and University of Colorado Boulder Colorado 80309 USA

We describe dipolar nematic colloids comprising mutually bound solid microspheres, three-dimensional skyrmions, and point defects in a molecular alignment field of chiral nematic liquid crystals. Nonlinear optical imaging and numerical modeling based on minimization of Landau–de Gennes free energy reveal that the particle-induced skyrmions resemble torons and hopfions, while matching surface boundary conditions at the interfaces of liquid crystal and colloidal spheres. Laser tweezers and videomicroscopy reveal that the skyrmion-colloidal hybrids exhibit purely repulsive elastic pair interactions in the case of parallel dipoles and an unexpected reversal of interaction forces from repulsive to attractive as the center-to-center distance decreases for antiparallel dipoles. The ensuing elastic self-assembly gives rise to colloidal chains of antiparallel dipoles with particles entangled by skyrmions.

关键词： SKYRMIONS RESEARCH LIQUID crystals MOLECULAR self-assembly PARTICLES QUANTUM entanglement

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Shape-dependent dispersion and alignment of nonaggregating plasmonic gold nanoparticles in lyotropic and thermotropic liquid crystals

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Physical Review E 2014年第5期89卷 052505-052505页

作者： Qingkun Liu Jianwei Tang Yuan Zhang Angel Martinez Shaowei Wang Sailing He Timothy J. White Ivan I. Smalyukh Department of Physics and Materials Science and Engineering Program University of Colorado at Boulder Boulder Colorado 80309 USA Centre for Optical and Electromagnetic Research Zhejiang University Hangzhou 310058 People's Republic of China Air Force Research Laboratory Materials and Manufacturing Directorate WPAFB OH USA Department of Electrical Computer and Energy Engineering and Liquid Crystals Materials Research Center University of Colorado at Boulder Boulder Colorado 80309 USA Renewable and Sustainable Energy Institute National Renewable Energy Laboratory and University of Colorado Boulder Colorado 80309 USA

We use both lyotropic liquid crystals composed of prolate micelles and thermotropic liquid crystals made of rod-like molecules to uniformly disperse and unidirectionally align relatively large gold nanorods and other complex-shaped nanoparticles at high concentrations. We show that some of these ensuing self-assembled orientationally ordered soft matter systems exhibit polarization-dependent plasmonic properties with strongly pronounced molar extinction exceeding that previously achieved in self-assembled composites. The long-range unidirectional alignment of gold nanorods is mediated mainly by anisotropic surface anchoring interactions at the surfaces of gold nanoparticles. Polarization-sensitive absorption, scattering, and extinction are used to characterize orientations of nanorods and other nanoparticles. The experimentally measured unique optical properties of these composites, which stem from the collective plasmonic effect of the gold nanorods with long-range order in a liquid crystal matrix, are reproduced in computer simulations. A simple phenomenological model based on anisotropic surface interaction explains the alignment of gold nanorods dispersed in liquid crystals and the physical underpinnings behind our observations.

关键词： LYOTROPIC liquid crystals PLASMONS (Physics) GOLD nanoparticles MICELLES NANORODS COMPOSITE materials

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Principles of high–fidelity, high–density 3–d neural recording

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BMC Neuroscience 2014年第1期15卷 1-2页

作者： Caroline Moore-Kochlacs Nancy Kopell Justin P Kinney Ed S Boyden Jorg Scholvin Jacob G Bernstein Scott K Arfin Young Gyu Yoon Graduate Program for Neuroscience Boston University Boston MA 02215 USA McGovern Institute Massachusetts Institute of Technology MA 02139 USA Department of Mathematics and Statistics Boston University Boston MA 02215 USA Media Lab Massachusetts Institute of Technology MA 02139 USA Brain and Cognitive Science Massachusetts Institute of Technology MA 02139 USA Biological Engineering Massachusetts Institute of Technology MA 02139 USA Electrical Engineering and Computer Science Massachusetts Institute of Technology MA 02139 USA

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Haze effect removal from image via haze density estimation in optical model

Haze effect removal from image via haze density estimation i...

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作者： Yeh, Chia-Hung Kang, Li-Wei Lee, Ming-Sui Lin, Cheng-Yang Department of Electrical Engineering National Sun Yat-sen University 804 Taiwan Graduate School of Engineering Science and Technology-Doctoral Program Department of Computer Science and Information Engineering National Yunlin University of Science and Technology Yunlin 640 Taiwan Graduate Institute of Networking and Multimedia Department of Computer Science and Information Engineering National Taiwan University Taipei 106 Taiwan

Images/videos captured from optical devices are usually degraded by turbid media such as haze, smoke, fog, rain and snow. Haze is the most common problem in outdoor scenes because of the atmosphere conditions. This paper proposes a novel single image-based dehazing framework to remove haze artifacts from images, where we propose two novel image priors, called the pixel-based dark channel prior and the pixel-based bright channel prior. Based on the two priors with the haze optical model, we propose to estimate atmospheric light via haze density analysis. We can then estimate transmission map, followed by refining it via the bilateral filter. As a result, high-quality haze-free images can be recovered with lower computational complexity compared with the state-of-the-art approach based on patch-based dark channel prior. ©2013 Optical Society of America.

关键词： Pixels

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Novel automatic posture detection for in-patient care using IMU sensors

Novel automatic posture detection for in-patient care using ...

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2013 6th IEEE Conference on Robotics, Automation and Mechatronics, RAM 2013

作者： Nguyen, Vo Nhat Yu, Haoyong Department of Electrical Engineering School of Computer Science National University of Singapore Block 4 Engineering Drive 3 Singapore 117576 Singapore Department of Bioengineering National University of Singapore Block EA 9 Engineering Drive 1 Singapore 117576 Singapore

ISBN: (纸本)9781479911998

Posture detection using Inertia Measurement Unit (IMU) has recently attracted great interests in healthcare research community. However, very few studies focus on the applications of this technology in the care of inpatients. This specific group of users, who are moderately to severely ill, have a distinct set of postures and activities that require special attentions and continuous monitoring from clinicians. In this paper, we present a novel methodology for automatic detection of postures for hospitalized patients using two wearable IMU sensors, with tri-axial accelerometers, attached at the chest and the abdomen respectively. The data were collected from participants who were carefully instructed to perform activities and attain postures that simulate those of hospitalized patients in real life. From the data retrieved, we performed orientation analysis for acceleration vectors and transition analysis for transitional activities between various postures. Both rule-based detection and Artificial Neural Network (ANN) for transition recognition achieved high accuracy. The results also showed that a combination of orientation and transition study could enhance the robustness of the detection algorithm. Due to its efficiency and simplicity, the proposed method could find its way into many applications that aim to improve the current state of inpatient healthcare. © 2013 IEEE.

关键词： Neural networks

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