4,918 research outputs found
Joon Shim Interview for Veterans\u27 Voices Project
No full textJoon K. Shim was commissioned into the United States Army in February 2002. Until 2006 Ms. Shim was earning an M. D. at George Washington University and University of Massachusetts. Upon becoming a general surgeon she served two tours in Afghanistan as a combat trauma surgeon during Operation Enduring Freedom. In 2015 she left the Army with the rank of Colonel.https://corescholar.libraries.wright.edu/veterans_voices/1150/thumbnail.jp
shim
No full textshim n...a thin piece of wood, you usually use a barrel stave or something like that, you know - oak, oak stave, that would take...take more wear than soft wood. A shim is used for stoggin' a...stoggin' moss in a ..in a winter house. They use 'em in the lumber woods.YesDNE-cit J. D. A. WIDDOWSONUsed I and SupUsed I and Sup1Used Ishem, Shin, MUNDLE, SLICE, wedge.The source is listed as T 43/7-64 in DNE with only part of the cited quotation on card in DNE
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Proposal of solid titanium shim and control rods
No full textThis report is a suggestion offered for a design modification regarding the material and layout of control and shim rods for the proposed G pile under design. The author suggests considering solid 2 inch diameter titanium control rods, in place of gadolinium-steel hollow 3 inch diameter rods which have been considered to this point. From a material cost and weight standpoint, and with regard to the neutron absorption properties, this suggestion appears better or equal to the original design proposal
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Effect of Shim Arm Depletion in the NBSR
No full textThe cadmium shim arms in the NBSR undergo burnup during reactor operation and hence, require periodic replacement. Presently, the shim arms are replaced after every 25 cycles to guarantee they can maintain sufficient shutdown margin. Two prior reports document the expected change in the 113Cd distribution because of the shim arm depletion. One set of calculations was for the present high-enriched uranium fuel and the other for the low-enriched uranium fuel when it was in the COMP7 configuration (7 inch fuel length vs. the present 11 inch length). The depleted 113Cd distributions calculated for these cores were applied to the current design for an equilibrium low-enriched uranium core. This report details the predicted effects, if any, of shim arm depletion on the shim arm worth, the shutdown margin, power distributions and kinetics parameters
Evaluation of Microwave Methods for Thickness Measurements of Liquid Shim Material
No full textThis paper describes the use of a microwave interferometer technique which measures the thickness of liquid shim material applied to composite surfaces. Liquid shim, which is a low dielectric material, is applied to spar cap surfaces in order to maintain wing skin mold-line tolerances while reducing stresses at the location of fastener holes. For this application, the thickness of the shim material must be controlled within specified limits. Microwave reflection techniques provide an alternative nondestructive approach to liquid shim thickness measurements.</p
Robust approach to inverse lighting using RGB-D images
No full textProper lighting is a key element in developing a photorealistic computer-generated image. This paper introduces a novel approach for robustly extracting lighting conditions from an RGB-D (RGB + depth) image. Existing studies on lighting estimation have developed image analysis techniques by constraining the scope and condition of the target objects. For example, they have assumed that the objects have homogeneous surfaces, inter-reflections can be ignored, and their three-dimensional (3D) geometries consist of a noise-free mesh. These assumptions, however, are unrealistic; real objects often have complicated non-homogeneous surfaces, inter-reflections that affect a considerable portion of illumination, or unpredictable noise that can affect sensor measurements. To overcome these limitations, this study takes non-homogeneous surface objects into account in the inverse lighting framework via segment-based scene representation. Moreover, we employ outlier removal and appropriate region selection to achieve robust lighting estimation in the presence of inter-reflections and noise. We demonstrate the effectiveness of the proposed approach by conducting extensive experiments on synthetic and real RGB-D images. (C) 2018 Elsevier Inc. All rights reserved.
‐shim array coils at 3 T
No full textMR spectroscopic imaging (MRSI) noninvasively maps the metabolism of human brains. In particular, the imaging of D-2-hydroxyglutarate (2HG) produced by glioma isocitrate dehydrogenase (IDH) mutations has become a key application in neuro-oncology. However, the performance of full field-of-view MRSI is limited by B0 spatial nonuniformity and lipid artifacts from tissues surrounding the brain. Array coils that multiplex RF-receive and B0-shim electrical currents (AC/DC mixing) over the same conductive loops provide many degrees of freedom to improve B0 uniformity and reduce lipid artifacts. AC/DC coils are highly efficient due to compact design, requiring low shim currents (<2 A) that can be switched fast (0.5 ms) with high interscan reproducibility (10% coefficient of variation for repeat measurements). We measured four tumor patients and five volunteers at 3 T and show that using AC/DC coils in addition to the vendor-provided second-order spherical harmonics shim provides 19% narrower spectral linewidth, 6% higher SNR, and 23% less lipid content for unrestricted field-of-view MRSI, compared with the vendor-provided shim alone. We demonstrate that improvement in MRSI data quality led to 2HG maps with higher contrast-to-noise ratio for tumors that coincide better with the FLAIR-enhancing lesions in mutant IDH glioma patients. Smaller Cramér–Rao lower bounds for 2HG quantification are obtained in tumors by AC/DC shim, corroborating with simulations that predicted improved accuracy and precision for narrower linewidths. AC/DC coils can be used synergistically with optimized acquisition schemes to improve metabolic imaging for precision oncology of glioma patients. Furthermore, this methodology has broad applicability to other neurological disorders and neuroscience
Engaging Faith: My Story in God\u27s Story
No full textThis book is the fruit of lifelong study through which Jay Shim has pondered the Christian grounding for our lives and an understanding of redemption that encompasses all of God\u27s creation. Dr. Shim\u27s writing honors Biblical revelation from Genesis through Revelation as a wholistic story of salvation; and he expands his theological ideas with contributions from Augustine, Calvin, Kuyper, Bavinck, and contemporary sources. In a God-created world where all of reality is sacred, the author believes our calling as ambassadors of reconciliation and renewal is an effort of freedom and joy.https://digitalcollections.dordt.edu/books/1068/thumbnail.jp
Novel target-field method for designing shielded biplanar shim and gradient coils
No full textA new method is presented here for the systematic design of biplanar shielded shim and gradient coils, for use in magnetic resonance imaging (MRI) and other applications. The desired target field interior to the coil is specified in advance, and a winding pattern is then designed to produce a field that matches the target as closely as possible. Both gradient and shim coils can be designed by this approach, and the target region can be located asymmetrically within the coil. The interior target field may be matched at two or more interior locations, to improve accuracy. When shields are present, the winding patterns are designed so that the fields exterior to the biplanar coil are made as small as possible. The method is illustrated here by the design of some transverse gradient and shim coils
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