Analysis of routine communication in the air traffic control system

The present project has three related goals. The first is to describe the organization of routine controller-pilot communication. This includes identifying the basic units of communication and how they are organized into discourse, how controllers and pilots use language to achieve their goals, and what topics they discuss. The second goal is to identify the type and frequency of problems that interrupt routine information transfer and prompt pilots and controllers to focus on the communication itself. The authors analyze the costs of these problems in terms of communication efficiency, and the techniques used to resolve these problems. Third, the authors hope to identify factors associated with communication problems, such as deviations from conventional air traffic control procedures

The influence of ATC message length and timing on pilot communication

Pilot-controller communication is critical to safe and efficient flight. It is often a challenging component of piloting, which is reflected in the number of incidents and accidents involving miscommunication. Our previous field study identified communication problems that disrupt routine communication between pilots and controllers. The present part-task simulation study followed up the field results with a more controlled investigation of communication problems. Pilots flew a simulation in which they were frequently vectored by Air Traffic Control (ATC), requiring intensive communication with the controller. While flying, pilots also performed a secondary visual monitoring task. We examined the influence of message length (one message with four commands vs. two messages with two commands each) and noncommunication workload on communication accuracy and length. Longer ATC messages appeared to overload pilot working memory, resulting in more incorrect or partial readbacks, as well as more requests to repeat the message. The timing between the two short messages also influenced communication. The second message interfered with memory for or response to the first short message when it was delivered too soon after the first message. Performing the secondary monitoring task did not influence communication. Instead, communication reduced monitoring accuracy

Immune function in ATP6V0A2-related cutis laxa

Cutis laxa (CL) is a genetic disorder of connective tissue. CL has known effects on multiple body systems, but its relationship to immune function has not been characterized. Recently, the laboratory of Jordan Orange, MD, PhD identified a patient with immune deficiency disease who also had a mutation in a known CL-causing gene, ATP6V0A2. This observation prompted us to look for evidence of immune dysfunction among individuals with ATP6V0A2- related CL. We administered an infection history survey to study participants with ATP6V0A2- related CL, their unaffected relatives, and individuals with ELN-related CL. We calculated a novel age weighted infection score for each participant and compared the three groups. We found that individuals with ATP6V0A2-related CL had significantly higher infection scores than unaffected family members (p=0.0004) or individuals with ELN-related cutis laxa (p=0.0016). These data suggest that ATP6V0A2 mutations have a deleterious effect on immune function. Our findings have public health significance because they further characterize the natural history of ATP6V0A2-related CL and thus enhance our ability to assess this condition in the population. The infection history questionnaire has the potential to be used in guiding genetic testing and in guiding medical management, support the public health function of policy development. In addition, research in CL is relevant to aging and to conditions that affect larger populations, such as asthma, chronic obstructive pulmonary disease, and heart disease

Savings Outcomes of Older Adults Participating IDAs: Findings from the American Dream Demonstration

This research report is the second of a three-part series aimed at developing a greater understanding of older adults and their use of Individual Development Accounts (IDAs). The intent of this second report is to answer the following question: What individual and IDA program characteristics are associated with saving outcomes among older adults participating in IDA? These questions are answered using data from the American Dream Demonstration programs (ADD), the first nation-wide evaluation of IDAs as tools for asset building and community development. In this report, comparisons are made between older (50 years or older) and younger (49 years or younger) adults for the purpose of identifying variations in IDA participation by age

Profile of Older Adults Participating IDAs: Findings from the American Dream Demonstration

This research report is the first of a three-part series aimed at developing a greater understanding of older adults and their use of Individual Development Accounts (IDAs). The intent of this first report is to answer the following three questions: 1) Who are the older adults participating in IDAs? 2) What are they saving for? and 3) What do we know about IDAs and saving for retirement? These questions are answered using data from the American Dream Demonstration (ADD), the first nation-wide evaluation of IDAs as tools for asset building and community development. In this report, comparisons are made between older (50 years or older) and younger (49 years or younger) adults for the purpose of identifying variations in IDA participation by age

Development of tailored text messages to enhance medication adherence

"Poor medication adherence is a public health problem. Interventions that include multiple components e.g., informational, behavioral, and social support report success in enhancing adherence. Social support delivery options have not been well studied. Mobile health technology (mHealth) is an innovative way to deliver social support focused interventions."--Introduction

Protozoal Coinfection in Horses with Equine Protozoal Myeloencephalitis in the Eastern United States

Background: Infection by 2 or more protozoa is linked with increased severity of disease in marine mammals with protozoan encephalitis. Hypothesis/Objectives: To assess whether horses with equine protozoal myeloencephalitis (EPM) caused by Sarcocystis neurona also have evidence of infection with Neospora hughesi or Toxoplasma gondii. We hypothesized that horses with EPM would be more likely than horses with cervical vertebral stenotic myelopathy (CVSM) to be positive for antibodies to multiple protozoan parasites. Animals: One hundred one horses with neurologic disease: 49 with EPM and 52 with CVSM. Methods: Case review. Archived serum and cerebrospinal fluid (CSF) from 101 horses were examined. Inclusion criteria included neurologic disease, antemortem or postmortem diagnosis of EPM or CVSM, and availability of serological results or archived samples for testing. Additional testing for antibodies was performed on serum for T. gondii, as well as serum and CSF for N. hughesi. Results: Horses with EPM were more likely than horses with CVSM to have positive immunologic results for S. neurona on serum (95.9% versus 76.9%, P = .0058), CSF (98.0% versus 44.2%, P \u3c .00001), and serum : CSF titer ratio (91.8% versus 0%, P \u3c .00001). Positive results for Neospora and Toxoplasma were uncommon, with total seroprevalence rates of 12.9% and 14.9%, respectively. The proportions of EPM cases testing positive for Neospora and Toxoplasma (16% and 12%) were not different from the proportions of CVSM cases testing positive (10% and 17%, P = .31 and .47, respectively). Conclusion: Results do not indicate an important role for protozoal coinfection in EPM in the eastern United States

Characterization of body weight and composition changes during the sophomore year of college

<p>Abstract</p> <p>Background</p> <p>Years spent in college represents a critical time for obesity development though little information is known regarding how body weight and composition changes beyond the first year of college. The aim of this study was to investigate changes in body weight and composition and the factors influencing those changes among sophomore females.</p> <p>Methods</p> <p>Body composition by dual energy X-ray absorptiometry was obtained in participants beginning during their freshman year and continued through their sophomore year.</p> <p>Results</p> <p>No difference was observed between sophomore year fall and spring visits for body weight (60.4 versus 60.6 kg) or fat mass (19.3 versus 18.7 kg). However, a significant (<it>P </it>≤ 0.05) decrease was observed for body fat (31.9 versus 30.9 %fat) and a significant increase was observed for fat-free mass (37.7 versus 38.4 kg). Participants living off campus significantly (<it>P </it>≤ 0.05) declined in body fat (33.0 versus 31.0 %fat) and fat mass (19.4 versus 18.2 kg) and increased in fat-free mass (36.1 versus 37.2 kg) with no differences in those living on campus.</p> <p>Conclusion</p> <p>No change in body weight was observed in females during their sophomore year. However, an increase in fat-free mass accompanied with a decrease in fat mass resulted in a decrease in body fat. Participants living off campus had favorable changes in their body composition by means of decreasing %fat and fat mass while increasing fat-free mass. Participants living on campus did not demonstrate these favorable changes.</p

Experimental and Theoretical Studies of the Redox Potentials of Cyclic Nitroxides

(Chemical Equation Presented) The redox potentials of 25 cyclic nitroxides from four different structural classes (pyrrolidine, piperidine, isoindoline, and azaphenalene) were determined experimentally by cyclic voltammetry in acetonitrile, and also via high-level ab initio molecular orbital calculations. It is shown that the potentials are influenced by the type of ring system, ring substituents and/or groups surrounding the radical moiety. For the pyrrolidine, piperidine, and isoindolines there is excellent agreement (mean absolute deviation of 0.05 V) between the calculated and experimental oxidation potentials; for the azaphenalenes, however, there is an extraordinary discrepancy (mean absolute deviation of 0.60 V), implying that their one-electron oxidation might involve additional processes not considered in the theoretical calculations. This recently developed azaphenalene class of nitroxide represents a new variant of a nitroxide ring fused to an aromatic system and details of the synthesis of five derivatives involving differing aryl substitution are also presented