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https://www.readbyqxmd.com/read/28344722/assessment-of-emergency-medicine-residents-a-systematic-review
#1
REVIEW
Isabelle N Colmers-Gray, Kieran Walsh, Teresa M Chan
BACKGROUND: Competency-based medical education is becoming the new standard for residency programs, including Emergency Medicine (EM). To inform programmatic restructuring, guide resources and identify gaps in publication, we reviewed the published literature on types and frequency of resident assessment. METHODS: We searched MEDLINE, EMBASE, PsycInfo and ERIC from Jan 2005 - June 2014. MeSH terms included "assessment," "residency," and "emergency medicine." We included studies on EM residents reporting either of two primary outcomes: 1) assessment type and 2) assessment frequency per resident...
February 2017: Canadian Medical Education Journal
https://www.readbyqxmd.com/read/28336911/2d-hybrid-analysis-approach-for-building-three-dimensional-atomic-model-by-electron-microscopy-image-matching
#2
Atsushi Matsumoto, Naoyuki Miyazaki, Junichi Takagi, Kenji Iwasaki
In this study, we develop an approach termed "2D hybrid analysis" for building atomic models by image matching from electron microscopy (EM) images of biological molecules. The key advantage is that it is applicable to flexible molecules, which are difficult to analyze by 3DEM approach. In the proposed approach, first, a lot of atomic models with different conformations are built by computer simulation. Then, simulated EM images are built from each atomic model. Finally, they are compared with the experimental EM image...
March 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28334132/maximum-likelihood-estimation-and-em-algorithm-of-copas-like-selection-model-for-publication-bias-correction
#3
Jing Ning, Yong Chen, Jin Piao
Publication bias occurs when the published research results are systematically unrepresentative of the population of studies that have been conducted, and is a potential threat to meaningful meta-analysis. The Copas selection model provides a flexible framework for correcting estimates and offers considerable insight into the publication bias. However, maximizing the observed likelihood under the Copas selection model is challenging because the observed data contain very little information on the latent variable...
February 25, 2017: Biostatistics
https://www.readbyqxmd.com/read/28332159/electromagnetically-tracked-personalized-templates-for-surgical-navigation
#4
Andrew W L Dickinson, Michelle L Zec, David R Pichora, Brian J Rasquinha, Randy E Ellis
PURPOSE: An electromagnetic (EM) surgical tracking system was developed for orthopedic navigation. The reportedly poor accuracy of point-based EM navigation was improved by using anatomical impressions, which were EM-tracked personalized templates. Lines, rather than points, were consistently used for calibration and error evaluation. METHODS: Technical accuracy was tested using models derived from CT scans of ten cadaver shoulders. Tracked impressions were first designed, calibrated, and tested using lines as fiducial objects...
March 22, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28322338/flexible-frequency-selective-metamaterials-for-microwave-applications
#5
Bo Gao, Matthew M F Yuen, Terry Tao Ye
Metamaterials have attracted more and more research attentions recently. Metamaterials for electromagnetic applications consist of sub-wavelength structures designed to exhibit particular responses to an incident EM (electromagnetic) wave. Traditional EM (electromagnetic) metamaterial is constructed from thick and rigid structures, with the form-factor suitable for applications only in higher frequencies (above GHz) in microwave band. In this paper, we developed a thin and flexible metamaterial structure with small-scale unit cell that gives EM metamaterials far greater flexibility in numerous applications...
March 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28304348/an-em-induction-hi-speed-rotation-angular-rate-sensor
#6
Kai Li, Yuan Li, Yan Han
A hi-speed rotation angular rate sensor based on an electromagnetic induction signal is proposed to provide a possibility of wide range measurement of high angular rates. An angular rate sensor is designed that works on the principle of electromagnetism (EM) induction. In addition to a zero-phase detection technique, this sensor uses the feedback principle of magnetic induction coils in response to a rotating magnetic field. It solves the challenge of designing an angular rate sensor that is suitable for both low and high rotating rates...
March 17, 2017: Sensors
https://www.readbyqxmd.com/read/28302724/genetically-introduced-hydrogen-bond-interactions-reveal-an-asymmetric-charge-distribution-on-the-radical-cation-of-the-special-pair-chlorophyll-p680
#7
Ryo Nagao, Motoki Yamaguchi, Shin Nakamura, Hanayo Ueoka-Nakanishi, Takumi Noguchi
The special-pair chlorophyll (Chl) P680 in photosystem II has an extremely high redox potential (Em) to enable water oxidation in photosynthesis. Significant positive charge localization on one of the Chl constituents, PD1 or PD2, in P680(+) has been proposed to contribute to this high Em To identify the Chl molecule on which the charge is mainly localized, we genetically introduced a hydrogen bond to the 13(1)-keto C=O group of PD1 and PD2 by changing the nearby D1-V157 and D2-V156 residues to His, respectively...
March 16, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28288152/patient-specific-modeling-of-individual-sickle-cell-behavior-under-transient-hypoxia
#8
Xuejin Li, E Du, Ming Dao, Subra Suresh, George Em Karniadakis
Sickle cell disease (SCD) is a highly complex genetic blood disorder in which red blood cells (RBC) exhibit heterogeneous morphology changes and decreased deformability. We employ a kinetic model for cell morphological sickling that invokes parameters derived from patient-specific data. This model is used to investigate the dynamics of individual sickle cells in a capillary-like microenvironment in order to address various mechanisms associated with SCD. We show that all RBCs, both hypoxia-unaffected and hypoxia-affected ones, regularly pass through microgates under oxygenated state...
March 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28281878/joint-modeling-of-time-to-recurrence-and-cancer-stage-at-recurrence-in-oncology-trials
#9
Olga Marchenko, Alex Tsodikov, Robert Keener, Natallia Katenka, Yngvil Kloster Thomas
This research was motivated by a clinical trial with bladder cancer patients who went through a surgery and were followed up for cancer recurrence. One of the main objectives of the trial was to evaluate the time to cancer recurrence in patients in control and experimental groups. At the time of recurrence, the disease stage was also evaluated. Because the stage of cancer at recurrence significantly impacts future treatment and patient prognosis of survival, analyzing the time to cancer recurrence and the stage at recurrence jointly provides more clinically relevant information than analyzing the time to recurrence alone...
February 7, 2017: Journal of Biopharmaceutical Statistics
https://www.readbyqxmd.com/read/28269677/radio-frequency-induced-heating-of-an-insulated-wire-during-magnetic-resonance-imaging
#10
Mikhail Kozlov, Gregor Schaefers
Radio frequency (RF) induced power deposition near straight insulated leads excited by different incident electrical field profiles was investigated. 3-D electromagnetic (EM) simulations were used to obtain implant models as well as RF-induced power depositions calculated as the integral of power loss density. For the investigated setups up to 400% discrepancy between the implant model predictions and EM simulation values was observed.
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28269599/simultaneous-reconstruction-and-segmentation-with-the-mumford-shah-functional-for-electron-tomography
#11
Li Shen, Eric Todd Quinto, Shiqiang Wang, Ming Jiang
Electron micrography (EM) is an important method for determining the three-dimensional (3D) structure of macromolecular complexes and biological specimens. But there are several limitations such as poor signal-to-noise, limitation on range of tilt angles and sub-region subject to electron exposure, unintentional movements of the specimen, with EM systems that make the reconstruction procedure a severely ill-posed problem. A different choice of reconstruction method may lead to different results and create different additional artifacts in reconstructed images...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28268321/an-em-imaging-based-localization-method-with-sparse-reconstruction-for-implant-devices
#12
Takahiro Ito, Taiki Iida, Daisuke Anzai, Jianqing Wang
To localize implant devices accurately, it is efficient to estimate a human internal structure with incident electromagnetic waves based on an electromagnetic (EM) imaging technique. In order to realize high resolution in such a localization system, it has been pointed out that huge number of measurement points should be required. To solve this problem, we investigated the possibility to apply the sparse reconstruction to the EM imaging-based localization in order to reduce the measurement points without any deterioration in the estimation accuracy...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28265060/electron-transfer-pathways-in-a-multiheme-cytochrome-mtrf
#13
Hiroshi C Watanabe, Yuki Yamashita, Hiroshi Ishikita
In MtrF, an outer-membrane multiheme cytochrome, the 10 heme groups are arranged in heme binding domains II and IV along the pseudo-C2 axis, forming the electron transfer (ET) pathways. Previous reports based on molecular dynamics simulations showed that the redox potential (Em) values for the heme pairs located in symmetrical positions in domains II and IV were similar, forming bidirectional ET pathways [Breuer M, Zarzycki P, Blumberger J, Rosso KM (2012) J Am Chem Soc 134(24):9868-9871]. Here, we present the Em values of the 10 hemes in MtrF, solving the linear Poisson-Boltzmann equation and considering the protonation states of all titratable residues and heme propionic groups...
March 6, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28263410/mixture-markov-regression-model-with-application-to-mosquito-surveillance-data-analysis
#14
Xin Gao, Yurong R Cao, Nicholas Ogden, Louise Aubin, Huaiping P Zhu
A mixture Markov regression model is proposed to analyze heterogeneous time series data. Mixture quasi-likelihood is formulated to model time series with mixture components and exogenous variables. The parameters are estimated by quasi-likelihood estimating equations. A modified EM algorithm is developed for the mixture time series model. The model and proposed algorithm are tested on simulated data and applied to mosquito surveillance data in Peel Region, Canada.
March 6, 2017: Biometrical Journal. Biometrische Zeitschrift
https://www.readbyqxmd.com/read/28236786/new-resonator-geometries-for-ice-decoupling-of-loop-arrays
#15
Xinqiang Yan, John C Gore, William A Grissom
RF arrays with a large number of independent coil elements are advantageous for parallel transmission (pTx) and reception at high fields. One of the main challenges in designing RF arrays is to minimize the electromagnetic (EM) coupling between the coil elements. The induced current elimination (ICE) method, which uses additional resonator elements to cancel coils' mutual EM coupling, has proven to be a simple and efficient solution for decoupling microstrip, L/C loop, monopole and dipole arrays. However, in previous embodiments of conventional ICE decoupling, the decoupling elements acted as "magnetic-walls" with low transmit fields and consequently low MR signal near them...
February 16, 2017: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/28227936/radio-frequency-induced-heating-of-an-insulated-wire-during-magnetic-resonance-imaging
#16
Mikhail Kozlov, Gregor Schaefers, Mikhail Kozlov, Gregor Schaefers, Gregor Schaefers, Mikhail Kozlov
Radio frequency (RF) induced power deposition near straight insulated leads excited by different incident electrical field profiles was investigated. 3-D electromagnetic (EM) simulations were used to obtain implant models as well as RF-induced power depositions calculated as the integral of power loss density. For the investigated setups up to 400% discrepancy between the implant model predictions and EM simulation values was observed.
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227855/simultaneous-reconstruction-and-segmentation-with-the-mumford-shah-functional-for-electron-tomography
#17
Li Shen, Eric Todd Quinto, Shiqiang Wang, Ming Jiang, Li Shen, Eric Todd Quinto, Shiqiang Wang, Ming Jiang, Ming Jiang, Eric Todd Quinto, Shiqiang Wang, Li Shen
Electron micrography (EM) is an important method for determining the three-dimensional (3D) structure of macromolecular complexes and biological specimens. But there are several limitations such as poor signal-to-noise, limitation on range of tilt angles and sub-region subject to electron exposure, unintentional movements of the specimen, with EM systems that make the reconstruction procedure a severely ill-posed problem. A different choice of reconstruction method may lead to different results and create different additional artifacts in reconstructed images...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226482/an-em-imaging-based-localization-method-with-sparse-reconstruction-for-implant-devices
#18
Takahiro Ito, Taiki Iida, Daisuke Anzai, Jianqing Wang, Takahiro Ito, Taiki Iida, Daisuke Anzai, Jianqing Wang, Takahiro Ito, Jianqing Wang, Daisuke Anzai, Taiki Iida
To localize implant devices accurately, it is efficient to estimate a human internal structure with incident electromagnetic waves based on an electromagnetic (EM) imaging technique. In order to realize high resolution in such a localization system, it has been pointed out that huge number of measurement points should be required. To solve this problem, we investigated the possibility to apply the sparse reconstruction to the EM imaging-based localization in order to reduce the measurement points without any deterioration in the estimation accuracy...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28211951/semiparametric-regression-analysis-of-interval-censored-competing-risks-data
#19
Lu Mao, Dan-Yu Lin, Donglin Zeng
Interval-censored competing risks data arise when each study subject may experience an event or failure from one of several causes and the failure time is not observed directly but rather is known to lie in an interval between two examinations. We formulate the effects of possibly time-varying (external) covariates on the cumulative incidence or sub-distribution function of competing risks (i.e., the marginal probability of failure from a specific cause) through a broad class of semiparametric regression models that captures both proportional and non-proportional hazards structures for the sub-distribution...
February 17, 2017: Biometrics
https://www.readbyqxmd.com/read/28211087/semiparametric-pseudoscore-for-regression-with-multidimensional-but-incompletely-observed-regressor
#20
Zonghui Hu, Jing Qin, Dean Follmann
We study the regression fβ (Y|X,Z), where Y is the response, Z∈Rd is a vector of fully observed regressors and X is the regressor with incomplete observation. To handle missing data, maximum likelihood estimation via expectation-maximisation (EM) is the most efficient but is sensitive to the specification of the distribution of X. Under a missing at random assumption, we propose an EM-type estimation via a semiparametric pseudoscore. Like in EM, we derive the conditional expectation of the score function given Y and Z, or the mean score, over the incompletely observed units under a postulated distribution of X...
February 16, 2017: Statistics in Medicine
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