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https://www.readbyqxmd.com/read/28211951/semiparametric-regression-analysis-of-interval-censored-competing-risks-data
#1
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
#2
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
https://www.readbyqxmd.com/read/28202903/dynamic-control-of-asymmetric-electromagnetic-wave-transmission-by-active-chiral-metamaterial
#3
Ke Chen, Yijun Feng, Li Cui, Junming Zhao, Tian Jiang, Bo Zhu
The asymmetric transmission of electromagnetic (EM) wave can be fully manipulated by chiral metamaterials, but little can achieve real-time and high efficient tunability due to challenges in practically deployable solutions. Here, we proposed a new scheme for flexibly and dynamically controlling the asymmetric EM wave transmission at microwave frequencies using planar metamaterial of deep subwavelength thickness incorporated with active components of PIN diodes. The asymmetric transmission of linearly polarized EM wave exhibits a high efficiency and a pronounced real-time continuous tunability controlled by the external stimulation of voltage biasing...
February 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28198966/computerized-nursing-process-in-the-intensive-care-unit-ergonomics-and-usability
#4
Sônia Regina Wagner de Almeida, Grace Teresinha Marcon Dal Sasso, Daniela Couto Carvalho Barra
OBJECTIVE: Analyzing the ergonomics and usability criteria of the Computerized Nursing Process based on the International Classification for Nursing Practice in the Intensive Care Unit according to International Organization for Standardization(ISO). METHOD: A quantitative, quasi-experimental, before-and-after study with a sample of 16 participants performed in an Intensive Care Unit. Data collection was performed through the application of five simulated clinical cases and an evaluation instrument...
November 2016: Revista da Escola de Enfermagem da U S P
https://www.readbyqxmd.com/read/28198965/development-of-a-virtual-learning-environment-for-cardiorespiratory-arrest-training
#5
Anazilda Carvalho da Silva, Andrea Bernardes, Yolanda Dora Martinez Évora, Maria Célia Barcellos Dalri, Alexandre Ribeiro da Silva, Camila Santana Justo Cintra Sampaio
OBJECTIVE: To develop a Virtual Learning Environment (VLE) aiming at the training of nursing team workers and emergency vehicle drivers in Basic Life Support (BLS) to attend Cardiorespiratory arrest, and to evaluate the quality of its contents among specialists in the area of Emergency and Urgent care. METHOD: Applied research of technological development. The methodology used was based on the Instructional Design Model (ADDIE), which structures the teaching-learning planning in different stages (analysis, design, development, implementation and evaluation)...
November 2016: Revista da Escola de Enfermagem da U S P
https://www.readbyqxmd.com/read/28191324/effect-of-logarithmic-and-linear-frequency-scales-on-parametric-modelling-of-tissue-dielectric-data
#6
Saqib Salahuddin, Emily Porter, Paul M Meaney, Martin O'Halloran
The dielectric properties of biological tissues have been studied widely over the past half-century. These properties are used in a vast array of applications, from determining the safety of wireless telecommunication devices to the design and optimisation of medical devices. The frequency-dependent dielectric properties are represented in closed-form parametric models, such as the Cole-Cole model, for use in numerical simulations which examine the interaction of electromagnetic (EM) fields with the human body...
February 2017: Biomedical Physics & Engineering Express
https://www.readbyqxmd.com/read/28181593/ultra-wideband-wide-angle-and-polarization-insensitive-specular-reflection-reduction-by-metasurface-based-on-parameter-adjustable-meta-atoms
#7
Jianxun Su, Yao Lu, Hui Zhang, Zengrui Li, Yaoqing Lamar Yang, Yongxing Che, Kainan Qi
In this paper, an ultra-wideband, wide angle and polarization-insensitive metasurface is designed, fabricated, and characterized for suppressing the specular electromagnetic wave reflection or backward radar cross section (RCS). Square ring structure is chosen as the basic meta-atoms. A new physical mechanism based on size adjustment of the basic meta-atoms is proposed for ultra-wideband manipulation of electromagnetic (EM) waves. Based on hybrid array pattern synthesis (APS) and particle swarm optimization (PSO) algorithm, the selection and distribution of the basic meta-atoms are optimized simultaneously to obtain the ultra-wideband diffusion scattering patterns...
February 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28167910/adaptive-baseline-enhances-em-based-policy-search-validation-in-a-view-based-positioning-task-of-a-smartphone-balancer
#8
Jiexin Wang, Eiji Uchibe, Kenji Doya
EM-based policy search methods estimate a lower bound of the expected return from the histories of episodes and iteratively update the policy parameters using the maximum of a lower bound of expected return, which makes gradient calculation and learning rate tuning unnecessary. Previous algorithms like Policy learning by Weighting Exploration with the Returns, Fitness Expectation Maximization, and EM-based Policy Hyperparameter Exploration implemented the mechanisms to discard useless low-return episodes either implicitly or using a fixed baseline determined by the experimenter...
2017: Frontiers in Neurorobotics
https://www.readbyqxmd.com/read/28141824/iterative-sure-independence-screening-em-bayesian-lasso-algorithm-for-multi-locus-genome-wide-association-studies
#9
Cox Lwaka Tamba, Yuan-Li Ni, Yuan-Ming Zhang
Genome-wide association study (GWAS) entails examining a large number of single nucleotide polymorphisms (SNPs) in a limited sample with hundreds of individuals, implying a variable selection problem in the high dimensional dataset. Although many single-locus GWAS approaches under polygenic background and population structure controls have been widely used, some significant loci fail to be detected. In this study, we used an iterative modified-sure independence screening (ISIS) approach in reducing the number of SNPs to a moderate size...
January 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28130937/developing-new-online-calibration-methods-for-multidimensional-computerized-adaptive-testing
#10
Ping Chen, Chun Wang, Tao Xin, Hua-Hua Chang
Multidimensional computerized adaptive testing (MCAT) has received increasing attention over the past few years in educational measurement. Like all other formats of CAT, item replenishment is an essential part of MCAT for its item bank maintenance and management, which governs retiring overexposed or obsolete items over time and replacing them with new ones. Moreover, calibration precision of the new items will directly affect the estimation accuracy of examinees' ability vectors. In unidimensional CAT (UCAT) and cognitive diagnostic CAT, online calibration techniques have been developed to effectively calibrate new items...
February 2017: British Journal of Mathematical and Statistical Psychology
https://www.readbyqxmd.com/read/28116031/exploring-scholarship-and-the-emergency-medicine-educator-a-workforce-study
#11
Jaime Jordan, Wendy C Coates, Samuel Clarke, Daniel P Runde, Emilie Fowlkes, Jacqueline Kurth, Lalena M Yarris
INTRODUCTION: Recent literature calls for initiatives to improve the quality of education studies and support faculty in approaching educational problems in a scholarly manner. Understanding the emergency medicine (EM) educator workforce is a crucial precursor to developing policies to support educators and promote education scholarship in EM. This study aims to illuminate the current workforce model for the academic EM educator. METHODS: Program leadership at EM training programs completed an online survey consisting of multiple choice, completion, and free-response type items...
January 2017: Western Journal of Emergency Medicine
https://www.readbyqxmd.com/read/28116028/characteristics-of-real-time-non-critical-incident-debriefing-practices-in-the-emergency-department
#12
Nur-Ain Nadir, Suzanne Bentley, Dimitrios Papanagnou, Komal Bajaj, Stephan Rinnert, Richard Sinert
INTRODUCTION: Benefits of post-simulation debriefings as an educational and feedback tool have been widely accepted for nearly a decade. Real-time, non-critical incident debriefing is similar to post-simulation debriefing; however, data on its practice in academic emergency departments (ED), is limited. Although tools such as TeamSTEPPS® (Team Strategies and Tools to Enhance Performance and Patient Safety) suggest debriefing after complicated medical situations, they do not teach debriefing skills suited to this purpose...
January 2017: Western Journal of Emergency Medicine
https://www.readbyqxmd.com/read/28116010/an-analysis-of-the-top-cited-articles-in-emergency-medicine-education-literature
#13
Brendan W Munzer, Jeffery Love, Barbara L Shipman, Brendan Byrne, Stephen J Cico, Robert Furlong, Sorabh Khandelwal, Sally A Santen
INTRODUCTION: Dissemination of educational research is critical to improving medical education, promotion of faculty and ultimately patient care. The objective of this study was to identify the top 25 cited education articles in the emergency medicine (EM) literature and the top 25 cited EM education articles in all journals, as well as report on the characteristics of the articles. METHODS: Two searches were conducted in the Web of Science in June 2016 using a list of education-related search terms...
January 2017: Western Journal of Emergency Medicine
https://www.readbyqxmd.com/read/28116009/teaching-the-emergency-department-patient-experience-needs-assessment-from-the-cord-em-task-force
#14
Kory S London, Jeffrey Druck, Matthew Silver, Douglas Finefrock
INTRODUCTION: Since the creation of Hospital Consumer Assessment of Healthcare Providers and Systems (HCAHPS) patient satisfaction (PS) scores, patient experience (PE) has become a metric that can profoundly affect the fiscal balance of hospital systems, reputation of entire departments and welfare of individual physicians. While government and hospital mandates demonstrate the prominence of PE as a quality measure, no such mandate exists for its education. The objective of this study was to determine the education and evaluation landscape for PE in categorical emergency medicine (EM) residencies...
January 2017: Western Journal of Emergency Medicine
https://www.readbyqxmd.com/read/28116005/a-needs-assessment-for-a-longitudinal-emergency-medicine-intern-curriculum
#15
Eric Shappell, James Ahn
INTRODUCTION: A key task of emergency medicine (EM) training programs is to develop a consistent knowledge of core content in recruits with heterogeneous training backgrounds. The traditional model for delivering core content is lecture-based weekly conference; however, a growing body of literature finds this format less effective and less appealing than alternatives. We sought to address this challenge by conducting a needs assessment for a longitudinal intern curriculum for millennial learners...
January 2017: Western Journal of Emergency Medicine
https://www.readbyqxmd.com/read/28113498/a-method-for-accurate-modeling-of-baw-filters-at-high-power-levels
#16
Andreas Tag, Vikrant Chauhan, Christian Huck, Bernhard Bader, Dominik Karolewski, Maximilian Pitschi, Robert Weigel, Amelie Hagelauer
A novel approach for multiphysics modeling of BAW filters is presented allowing accurate and at the same time efficient modeling of BAW filters at high power levels. The approach takes the different types of losses and their spatial distribution into account in order to provide the required input for thermal simulation. The temperature distribution determined by thermal simulation is used to modify the geometry and the layer stack of each single resonator of the filter. In this way the required input for modeling of electromagnetic and acoustic behavior at high power level is generated...
October 4, 2016: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28113494/switchable-and-tunable-baw-duplexer-based-on-ferroelectric-material
#17
Almonir Mansour, Thottam Kalkur
A switchable and tunable BAW duplexer for RF applications is presented in this paper. The fabricated BAW duplexer was built on sapphire substrate using solidly mounted resonators (SMR). A metalorganic solution deposition (MOSD) technique was used to form resonators with barium strontium titanate (BST) thin film and six layers of silicon dioxide and tantalum oxide as a Bragg reflector. By applying DC bias, the BST thin film shows an electrostrictive effect, and the two filter paths of the BAW duplexer switch to band pass response with center frequencies at 4...
October 4, 2016: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28110720/classification-based-quantitative-analysis-of-stable-isotope-labeling-by-amino-acids-in-cell-culture-silac-data
#18
Seongho Kim, Nicholas Carruthers, Joohyoung Lee, Sreenivasa Chinni, Paul Stemmer
BACKGROUND AND OBJECTIVE: Stable isotope labeling by amino acids in cell culture (SILAC) is a practical and powerful approach for quantitative proteomic analysis. A key advantage of SILAC is the ability to simultaneously detect the isotopically labeled peptides in a single instrument run and so guarantee relative quantitation for a large number of peptides without introducing any variation caused by separate experiment. However, there are a few approaches available to assessing protein ratios and none of the existing algorithms pays considerable attention to the proteins having only one peptide hit...
December 2016: Computer Methods and Programs in Biomedicine
https://www.readbyqxmd.com/read/28109880/dynamics-of-the-eag1-k-channel-selectivity-filter-assessed-by-molecular-dynamics-simulations
#19
Harald Bernsteiner, Michael Bründl, Anna Stary-Weinzinger
EAG1 channels belong to the KCNH family of voltage gated potassium channels. They are expressed in several brain regions and increased expression is linked to certain cancer types. Recent cryo-EM structure determination finally revealed the structure of these channels in atomic detail, allowing computational investigations. In this study, we performed molecular dynamics simulations to investigate the ion binding sites and the dynamical behavior of the selectivity filter. Our simulations suggest that sites S2 and S4 form stable ion binding sites, while ions placed at sites S1 and S3 rapidly switched to sites S2 and S4...
January 19, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28106843/underwater-electromagnetic-sensor-networks-part-i-link-characterization
#20
Gara Quintana-Díaz, Pablo Mena-Rodríguez, Iván Pérez-Álvarez, Eugenio Jiménez, Blas-Pablo Dorta-Naranjo, Santiago Zazo, Marina Pérez, Eduardo Quevedo, Laura Cardona, J Joaquín Hernández
Underwater Wireless Sensor Networks (UWSNs) using electromagnetic (EM) technology in marine shallow waters are examined, not just for environmental monitoring but for further interesting applications. Particularly, the use of EM waves is reconsidered in shallow waters due to the benefits offered in this context, where acoustic and optical technologies have serious disadvantages. Sea water scenario is a harsh environment for radiocommunications, and there is no standard model for the underwater EM channel. The high conductivity of sea water, the effect of seabed and the surface make the behaviour of the channel hard to predict...
January 19, 2017: Sensors
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