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Elias Pavlatos, Hong Chen, Keyton Clayson, Xueliang Pan, Jun Liu
Imaging corneal biomechanical changes or abnormalities is important for better clinical diagnosis and treatment of corneal diseases. We propose a novel ultrasound-based method, called ocular pulse elastography (OPE), to image corneal deformation during the naturally occurring ocular pulse. Experiments on animal and human donor eyes, as well as synthetic radiofrequency (RF) data, were used to evaluate the efficacy of the OPE method. Using very high-frequency ultrasound (center frequency = 55 MHz), correlation-based speckle tracking yielded an accuracy of less than 10% error for axial tissue displacements of or above...
February 2018: IEEE Transactions on Medical Imaging
Keyton Clayson, Elias Pavlatos, Yanhui Ma, Jun Liu
The three-dimensional (3D) mechanical response of the cornea to intraocular pressure (IOP) elevation has not been previously reported. In this study, we use an ultrasound speckle tracking technique to measure the 3D displacements and strains within the central 5.5 mm of porcine corneas during the whole globe inflation. Inflation tests were performed on dextran-treated corneas (treated with a 10% dextran solution) and untreated corneas. The dextran-treated corneas showed an inflation response expected of a thin spherical shell, with through-thickness thinning and in-plane stretch, although the strain magnitudes exhibited a heterogeneous spatial distribution from the central to more peripheral cornea...
November 2017: Journal of Innovative Optical Health Sciences
Nale Lehmann-Willenbrock, Hayley Hung, Joann Keyton
This special issue on advancing interdisciplinary collaboration between computer scientists and social scientists documents the joint results of the international Lorentz workshop, "Interdisciplinary Insights into Group and Team Dynamics," which took place in Leiden, The Netherlands, July 2016. An equal number of scholars from social and computer science participated in the workshop and contributed to the papers included in this special issue. In this introduction, we first identify interaction dynamics as the core of group and team models and review how scholars in social and computer science have typically approached behavioral interactions in groups and teams...
October 2017: Small Group Research
Keyton Clayson, Xueliang Pan, Elias Pavlatos, Ryan Short, Hugh Morris, Richard T Hart, Jun Liu
Factors governing the steady-state IOP have been extensively studied; however, the dynamic aspects of IOP are less understood. Clinical studies have suggested that intraocular pressure (IOP) fluctuation may be associated with glaucoma risk. This study aims to investigate how stiffening of corneoscleral biomechanical properties affects IOP spikes induced by rapid microvolumetric change. Porcine eyes (n = 25 in total) were subjected to volumetric infusions before and after external treatment of a circular area (11 mm diameter) in either the central cornea or posterior sclera...
December 2017: Experimental Eye Research
Rebecca H Johnson, Catherine Fiona Macpherson, Ashley W Smith, Rebecca G Block, Joann Keyton
A case of a young adult patient in the days immediately after a cancer diagnosis illustrates the critical importance of three interrelated core coordinating mechanisms-closed-loop communication, shared mental models, and mutual trust-of teamwork in an adolescent and young adult multidisciplinary oncology team. The case illustrates both the opportunities to increase team member coordination and the problems that can occur when coordination breaks down. A model for teamwork is presented, which highlights the relationships among these coordinating mechanisms and demonstrates how balance among them works to optimize team function and patient care...
November 2016: Journal of Oncology Practice
Jacob Powell, Keyton Kalakewich, Fernando J Uribe-Romo, James K Harper
For nearly 140 years n-alkyl monocarboxylic acids have been known to exhibit unusual non-monotonic melting between odd and even numbered acids. This behavior has been rationalized in terms of packing density at the hydrocarbon tails, with COOH hydrogen bonding considered to be invariant among different acids. A recent ambiguity involving the COOH conformation between two crystal structures of lauric acid suggests that COOH structure and hydrogen bonding may play a role in these differences. Here, the two conflicting lauric acid crystal structures are further refined using lattice-including DFT refinement methods...
May 14, 2016: Physical Chemistry Chemical Physics: PCCP
Keyton Kalakewich, Robbie Iuliucci, Karl T Mueller, Harriet Eloranta, James K Harper
The (15)N chemical shift tensor is shown to be extremely sensitive to lattice structure and a powerful metric for monitoring density functional theory refinements of crystal structures. These refinements include lattice effects and are applied here to five crystal structures. All structures improve based on a better agreement between experimental and calculated (15)N tensors, with an average improvement of 47.0 ppm. Structural improvement is further indicated by a decrease in forces on the atoms by 2-3 orders of magnitude and a greater similarity in atom positions to neutron diffraction structures...
November 21, 2015: Journal of Chemical Physics
Shera C Thomas-Jackson, Gail E Bentley, Kristina Keyton, Alan Reifman, Mallory Boylan, Sybil L Hart
BACKGROUND: Research continues to demonstrate that formula feeding is associated with numerous long-term negative outcomes for a mother and her infant. However, many women cease breastfeeding sooner than intended and recommended. Breastfeeding has been found to be related to demographics, maternal mood, and returning to work outside the home. OBJECTIVES: This study aimed to shed light on the woman's perception of the effect of working on intended breastfeeding duration...
November 2016: Journal of Human Lactation: Official Journal of International Lactation Consultant Association
Stephenson J Beck, Joann Keyton
BACKGROUND: Early detection and treatment have resulted in more women surviving breast cancer; increased survivorship has also increased the need for breast cancer support groups (BCSG). The ostensible goal of such groups is to provide support for the physical and emotional stressors that cancer survivors face, as well as provide information on coping and treatment options. OBJECTIVE: Although scholars have examined the effects of support groups on their group members, the examination of group facilitator messages has been largely neglected...
January 2014: Cancer Nursing
Holly J Falk-Krzesinski, Noshir Contractor, Stephen M Fiore, Kara L Hall, Cathleen Kane, Joann Keyton, Julie Thompson Klein, Bonnie Spring, Daniel Stokols, William Trochim
An increase in cross-disciplinary, collaborative team science initiatives over the last few decades has spurred interest by multiple stakeholder groups in empirical research on scientific teams, giving rise to an emergent field referred to as the science of team science (SciTS). This study employed a collaborative team science concept-mapping evaluation methodology to develop a comprehensive research agenda for the SciTS field. Its integrative mixed-methods approach combined group process with statistical analysis to derive a conceptual framework that identifies research areas of team science and their relative importance to the emerging SciTS field...
June 1, 2011: Research Evaluation
Joann Keyton
In this commentary, the author reflects on the articles chosen for the special section on communications analysis. These articles problematize communication and raise an interesting set of questions for both human factors and communication scholars to ponder. In the end, both sets of scholars seek the same goal: How do we better examine communication to improve it? Problematizing communication requires scholars to challenge their fundamental assumptions about the phenomenon as well as to tease out the distinctions of methodological approaches typically used by both human factors and communication scholars...
August 2012: Human Factors
Nancy J Cooke, Andrew Duchon, Jamie C Gorman, Joann Keyton, Anne Miller
No abstract text is available yet for this article.
August 2012: Human Factors
Holly J Falk-Krzesinski, Katy Börner, Noshir Contractor, Stephen M Fiore, Kara L Hall, Joann Keyton, Bonnie Spring, Daniel Stokols, William Trochim, Brian Uzzi
The First Annual International Science of Team Science (SciTS) Conference was held in Chicago, IL April 22-24, 2010. This article presents a summary of the Conference proceedings.
October 2010: Clinical and Translational Science
Joann Keyton, Stephenson J Beck
OBJECTIVE: There are significant points of alignment between a macrocognitive frame of teamwork and a communication perspective. This commentary explores these touch points in regard to use of teams in sociotechnical systems (STS). BACKGROUND: The macrocognitive framework emphasizes a team's shared mental models whereas a communication frame emphasizes that shared meaning among team members is more frequently implicitly than explicitly recorded in their messages...
April 2010: Human Factors
Adrianne Kunkel, Michael Robert Dennis, Joann Keyton
No abstract text is available yet for this article.
September 2010: Health Communication
Katy Börner, Noshir Contractor, Holly J Falk-Krzesinski, Stephen M Fiore, Kara L Hall, Joann Keyton, Bonnie Spring, Daniel Stokols, William Trochim, Brian Uzzi
This Commentary describes recent research progress and professional developments in the study of scientific teamwork, an area of inquiry termed the "science of team science" (SciTS, pronounced "sahyts"). It proposes a systems perspective that incorporates a mixed-methods approach to SciTS that is commensurate with the conceptual, methodological, and translational complexities addressed within the SciTS field. The theoretically grounded and practically useful framework is intended to integrate existing and future lines of SciTS research to facilitate the field's evolution as it addresses key challenges spanning macro, meso, and micro levels of analysis...
September 15, 2010: Science Translational Medicine
Gilbert C Liu, Mitchell A Harris, Stacey A Keyton, Richard M Frankel
OBJECTIVE: Medical education programs across the country are now required to conduct meaningful assessments of trainees' competencies, although uniform standards for conducting these evaluations have yet to be established. In 1999, the Indiana University School of Medicine introduced a comprehensive competency-based undergraduate curriculum. The overall goal of the curriculum is to make medical students' day-to-day experiences of training a source of learning about professionalism, communication, and aspects of medicine beyond factual knowledge...
May 2007: Ambulatory Pediatrics: the Official Journal of the Ambulatory Pediatric Association
No abstract text is available yet for this article.
January 1950: Journal of the Medical Association of the State of Alabama
No abstract text is available yet for this article.
February 1953: Journal of the Medical Association of the State of Alabama
Christian Stöcker, Albrecht Sebald, Joachim Hoffmann
Participants performed a serial reaction time task, responding to either asterisks presented at varying screen locations or centrally presented letters. Stimulus presentation followed a fixed second-order conditional sequence. Each keypress in the experimental groups produced a contingent, key-specific tone effect. The critical variation concerned the mapping of tones to keys. In Experiment 1, keypresses in one control condition produced noncontingent tone effects, while in another control condition there were no tone effects...
May 2003: Quarterly Journal of Experimental Psychology. A, Human Experimental Psychology
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