161,100 Works

Additional file 2: of Advocacy for outpatient cardiac rehabilitation globally

Abraham Babu, Francisco Lopez-Jimenez, Randal Thomas, Wanrudee Isaranuwatchai, Artur Haddad Herdy, Jeffrey Hoch & Sherry Grace
Cardiac rehabilitation pamphlet. (PDF 1.09 mb)

Additional file 3: of Advocacy for outpatient cardiac rehabilitation globally

Abraham Babu, Francisco Lopez-Jimenez, Randal Thomas, Wanrudee Isaranuwatchai, Artur Haddad Herdy, Jeffrey Hoch & Sherry Grace
Cardiac rehabilitation advocacy tool kit. (PDF 229 kb)

Nonparametric Estimation of the Leverage Effect: A Trade-Off Between Robustness and Efficiency

Ilze Kalnina & Dacheng Xiu
We consider two new approaches to nonparametric estimation of the leverage effect. The first approach uses stock prices alone. The second approach uses the data on stock prices as well as a certain volatility instrument, such as the Chicago Board Options Exchange (CBOE) volatility index (VIX) or the Black–Scholes implied volatility. The theoretical justification for the instrument-based estimator relies on a certain invariance property, which can be exploited when high-frequency data are available. The price-only...

A Multi-Resolution Approximation for Massive Spatial Datasets

Matthias Katzfuss
Automated sensing instruments on satellites and aircraft have enabled the collection of massive amounts of high-resolution observations of spatial fields over large spatial regions. If these datasets can be efficiently exploited, they can provide new insights on a wide variety of issues. However, traditional spatial-statistical techniques such as kriging are not computationally feasible for big datasets. We propose a multi-resolution approximation (M-RA) of Gaussian processes observed at irregular locations in space. The M-RA process is...

Promoting Similarity of Sparsity Structures in Integrative Analysis With Penalization

Yuan Huang, Qingzhao Zhang, Sanguo Zhang, Jian Huang & Shuangge Ma
For data with high-dimensional covariates but small sample sizes, the analysis of single datasets often generates unsatisfactory results. The integrative analysis of multiple independent datasets provides an effective way of pooling information and outperforms single-dataset and several alternative multi-datasets methods. Under many scenarios, multiple datasets are expected to share common important covariates, that is, the corresponding models have similarity in their sparsity structures. However, the existing methods do not have a mechanism to promote the...

A Concave Pairwise Fusion Approach to Subgroup Analysis

Shujie Ma & Jian Huang
An important step in developing individualized treatment strategies is correct identification of subgroups of a heterogeneous population to allow specific treatment for each subgroup. This article considers the problem using samples drawn from a population consisting of subgroups with different mean values, along with certain covariates. We propose a penalized approach for subgroup analysis based on a regression model, in which heterogeneity is driven by unobserved latent factors and thus can be represented by using...

Randomization Inference and Sensitivity Analysis for Composite Null Hypotheses With Binary Outcomes in Matched Observational Studies

Colin B. Fogarty, Pixu Shi, Mark E. Mikkelsen & Dylan S. Small
We present methods for conducting hypothesis testing and sensitivity analyses for composite null hypotheses in matched observational studies when outcomes are binary. Causal estimands discussed include the causal risk difference, causal risk ratio, and the effect ratio. We show that inference under the assumption of no unmeasured confounding can be performed by solving an integer linear program, while inference allowing for unmeasured confounding of a given strength requires solving an integer quadratic program. Through simulation...

Integrated-Quantile-Based Estimation for First-Price Auction Models

Yao Luo & Yuanyuan Wan
This article considers nonparametric estimation of first-price auction models under the monotonicity restriction on the bidding strategy. Based on an integrated-quantile representation of the first-order condition, we propose a tuning-parameter-free estimator for the valuation quantile function. We establish its cube-root-n consistency and asymptotic distribution under weaker smoothness assumptions than those typically assumed in the empirical literature. If the latter are true, we also provide a trimming-free smoothed estimator and show that it is asymptotically normal...

Three-dimensional rearrangement of single atoms using actively controlled optical microtraps

Woojun Lee, Hyosub Kim & Jaewook Ahn
We propose and demonstrate three-dimensional rearrangements of single atoms. In experiments performed with single 87Rb atoms in optical microtraps actively controlled by a spatial light modulator, we demonstrate various dynamic rearrangements of up to N = 9 atoms including rotation, 2D vacancy filling, guiding, compactification, and 3D shuffling. With the capability of a phase-only Fourier mask to generate arbitrary shapes of the holographic microtraps, it was possible to place single atoms at arbitrary geometries of...

Three-dimensional rearrangement of single atoms using actively controlled optical microtraps

Woojun Lee, Hyosub Kim & Jaewook Ahn
We propose and demonstrate three-dimensional rearrangements of single atoms. In experiments performed with single 87Rb atoms in optical microtraps actively controlled by a spatial light modulator, we demonstrate various dynamic rearrangements of up to N = 9 atoms including rotation, 2D vacancy filling, guiding, compactification, and 3D shuffling. With the capability of a phase-only Fourier mask to generate arbitrary shapes of the holographic microtraps, it was possible to place single atoms at arbitrary geometries of...

Diffractive optical element for creating visual 3D images

Alexander Goncharsky, Anton Goncharsky & Svyatoslav Durlevich
A method is proposed to compute and synthesize the microrelief of a diffractive optical element to produce a new visual security feature – the vertical 3D/3D switch effect. The security feature consists in the alternation of two 3D color images when the diffractive element is tilted up/down. Optical security elements that produce the new security feature are synthesized using electron-beam technology. Sample optical security elements are manufactured that produce 3D to 3D visual switch effect...

Diffractive optical element for creating visual 3D images

Alexander Goncharsky, Anton Goncharsky & Svyatoslav Durlevich
A method is proposed to compute and synthesize the microrelief of a diffractive optical element to produce a new visual security feature – the vertical 3D/3D switch effect. The security feature consists in the alternation of two 3D color images when the diffractive element is tilted up/down. Optical security elements that produce the new security feature are synthesized using electron-beam technology. Sample optical security elements are manufactured that produce 3D to 3D visual switch effect...

Computational multi-projection display

Seokil Moon, Soon-Gi Park, Chang-Kun Lee, Jaebum Cho, Seungjae Lee & Byoungho Lee
A computational multi-projection display is proposed by employing a multi-projection system combining with compressive light field displays. By modulating the intensity of light rays from a spatial light modulator inside a single projector, the proposed system can offer several compact views to observer. Since light rays are spread to all directions, the system can provide flexible positioning of viewpoints without stacking projectors in vertical direction. Also, if the system is constructed properly, it is possible...

Computational multi-projection display

Seokil Moon, Soon-Gi Park, Chang-Kun Lee, Jaebum Cho, Seungjae Lee & Byoungho Lee
A computational multi-projection display is proposed by employing a multi-projection system combining with compressive light field displays. By modulating the intensity of light rays from a spatial light modulator inside a single projector, the proposed system can offer several compact views to observer. Since light rays are spread to all directions, the system can provide flexible positioning of viewpoints without stacking projectors in vertical direction. Also, if the system is constructed properly, it is possible...

Highly photorefractive hybrid liquid crystal device for a video-rate holographic display

Xiao Li, Yan Li, Ying Xiang, Na Rong, Pengcheng Zhou, Shuxin Liu, Jiangang Lu & Yikai Su
In this paper, we demonstrate a dynamic holographic display in a quantum dot (ZnS/InP) doped liquid crystal device, where one of the interior cell surfaces is covered by a ZnSe layer. Such a hybrid device shows substantially improved photorefractive sensitivity of 2.2 cm3/J, which is almost 300 times larger than that in ZnS/InP doped liquid crystal device without the ZnSe layer. The holographic grating can form at intensities as low as ~0.8 mW/cm2, and exhibit...

Highly photorefractive hybrid liquid crystal device for a video-rate holographic display

Xiao Li, Yan Li, Ying Xiang, Na Rong, Pengcheng Zhou, Shuxin Liu, Jiangang Lu & Yikai Su
In this paper, we demonstrate a dynamic holographic display in a quantum dot (ZnS/InP) doped liquid crystal device, where one of the interior cell surfaces is covered by a ZnSe layer. Such a hybrid device shows substantially improved photorefractive sensitivity of 2.2 cm3/J, which is almost 300 times larger than that in ZnS/InP doped liquid crystal device without the ZnSe layer. The holographic grating can form at intensities as low as ~0.8 mW/cm2, and exhibit...

White-light quantitative phase imaging unit

YoonSeok Baek, KyeoReh Lee, Jonghee Yoon, Kyoohyun Kim & YongKeun Park
We introduce the white-light quantitative phase imaging unit (WQPIU) as a practical realization of quantitative phase imaging (QPI) on standard microscope platforms. The WQPIU is a compact stand-alone unit which measures sample induced phase delay under white-light illumination. It does not require any modification of the microscope or additional accessories for its use. The principle of the WQPIU based on lateral shearing interferometry and phase shifting interferometry provides a cost-effective and user-friendly use of QPI....

White-light quantitative phase imaging unit

YoonSeok Baek, KyeoReh Lee, Jonghee Yoon, Kyoohyun Kim & YongKeun Park
We introduce the white-light quantitative phase imaging unit (WQPIU) as a practical realization of quantitative phase imaging (QPI) on standard microscope platforms. The WQPIU is a compact stand-alone unit which measures sample induced phase delay under white-light illumination. It does not require any modification of the microscope or additional accessories for its use. The principle of the WQPIU based on lateral shearing interferometry and phase shifting interferometry provides a cost-effective and user-friendly use of QPI....

Electrothermal MEMS parallel plate rotation for single-imager stereoscopic endoscopes

Kyung-Won Jang, Sung-Pyo Yang, Seung-Hwan Baek, Min-Suk Lee, Hyeon-Cheol Park, Yeong-Hyeon Seo, Min H. Kim & Ki-Hun Jeong
This work reports electrothermal MEMS parallel plate-rotation (PPR) for a single-imager based stereoscopic endoscope. A thin optical plate was directly connected to an electrothermal MEMS microactuator with bimorph structures of thin silicon and aluminum layers. The fabricated MEMS PPR device precisely rotates an transparent optical plate up to 37° prior to an endoscopic camera and creates the binocular disparities, comparable to those from binocular cameras with a baseline distance over 100 μm. The anaglyph 3D...

Electrothermal MEMS parallel plate rotation for single-imager stereoscopic endoscopes

Kyung-Won Jang, Sung-Pyo Yang, Seung-Hwan Baek, Min-Suk Lee, Hyeon-Cheol Park, Yeong-Hyeon Seo, Min H. Kim & Ki-Hun Jeong
This work reports electrothermal MEMS parallel plate-rotation (PPR) for a single-imager based stereoscopic endoscope. A thin optical plate was directly connected to an electrothermal MEMS microactuator with bimorph structures of thin silicon and aluminum layers. The fabricated MEMS PPR device precisely rotates an transparent optical plate up to 37° prior to an endoscopic camera and creates the binocular disparities, comparable to those from binocular cameras with a baseline distance over 100 μm. The anaglyph 3D...

Slim-structured electro-floating display system based on the polarization-controlled optical path

Seung-Cheol Kim, Seong-Jin Park & Eun-Soo Kim
A new slim-type electro-floating display system based on the polarization-controlled optical path is proposed. In the proposed system, the optical path between the input plane and Fresnel lens can be made recursive by repetitive transmission and reflection of the input beam by employing a new polarization-based optical path controller (P-OPC), which is composed of two quaterwave plates, a half mirror and a reflective polarizer. Based on this P-OPC, the absolute optical path between the input...

Slim-structured electro-floating display system based on the polarization-controlled optical path

Seung-Cheol Kim, Seong-Jin Park & Eun-Soo Kim
A new slim-type electro-floating display system based on the polarization-controlled optical path is proposed. In the proposed system, the optical path between the input plane and Fresnel lens can be made recursive by repetitive transmission and reflection of the input beam by employing a new polarization-based optical path controller (P-OPC), which is composed of two quaterwave plates, a half mirror and a reflective polarizer. Based on this P-OPC, the absolute optical path between the input...

Nanowire-nanoantenna coupled system fabricated by nanomanipulation

Masaaki Ono, Eiichi Kuramochi, Guoqiang Zhang, Hisashi Sumikura, Yuichi Harada, David Cox & Masaya Notomi
Here we demonstrate the combination of a semiconductor nanowire and a plasmonic bowtie nanoantenna. A subwavelength InP nanowire was placed precisely in the middle of the nanogap of a gold bowtie nanoantenna with a nanomanipulator installed in a focused ion beam system. We observed a significantly large enhancement (by a factor of 110) of the photoluminescence intensity from this coupled system when the excitation wavelength was at the plasmonic resonance with its polarization parallel to...

Nanowire-nanoantenna coupled system fabricated by nanomanipulation

Masaaki Ono, Eiichi Kuramochi, Guoqiang Zhang, Hisashi Sumikura, Yuichi Harada, David Cox & Masaya Notomi
Here we demonstrate the combination of a semiconductor nanowire and a plasmonic bowtie nanoantenna. A subwavelength InP nanowire was placed precisely in the middle of the nanogap of a gold bowtie nanoantenna with a nanomanipulator installed in a focused ion beam system. We observed a significantly large enhancement (by a factor of 110) of the photoluminescence intensity from this coupled system when the excitation wavelength was at the plasmonic resonance with its polarization parallel to...

260 frames-per-second 648x488 resolution division-of-focal-plane polarimeter with structural dynamics and tracking applications

Timothy York, Radoslav Marinov & Viktor Gruev
We have designed an image sensor that can capture the first three Stokes parameters at 648 by 488 spatial resolution at 260 frames per second. The sensor consists of a CCD image sensor monolithically integrated with pixel pitch-matched aluminum nanowire polarization filters. The sensor demonstrates a Malus law response over all pixels, and has a relatively uniform diattenuation over the visible spectrum. We demonstrate two potential applications for the sensor. The first uses circular polarization...

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