Making effective videos for (live) online learning quickly

Videos are capable of delivering information that would otherwise be delivered in person in a classroom. At the same time, they are independent of restrictions on time and location and can be viewed by students according to their own time and needs. If used appropriately, they have been shown to improve students' understanding of the material and organizing the information presented in an introductory physics lecture (Dunleavy, Kestin, Callaghan, McCarty, & Deslauriers, 2022). By incorporating several principles for the design of multimedia material, they can further improve learning (Mayer, 2020). Depending on the type of video (informal talk, lecture, tutorial), different design formats are more beneficial to the learner. The presentation of static slides or chunked recordings of full lectures, however, are not engaging (Guo, Kim, & Rubin, 2014). During the COVID-19 pandemic, a lot of in-person lectures have been replaced by synchronous online lectures. These lectures have the same format of videos, but are usually limited in terms of possibilities to meet good design principles. This can create a barrier for some students to learn. Since they are live in nature, there is no possibility for post-production. Enhancements of the video-stream have to be made while presenting the lecture. This imposes further requirements and difficulties on the presenter. There exists a variety of technical solutions usually aimed at online-streaming of live content (e.g., video-games). Those solutions can be utilized to make synchronous online lectures meet good multimedia design principles. As an example, the presenter can be shown in front of supporting multimedia material, following the design principle of image and embodiment (Mayer, 2020). Using this kind of technology allows a video design that increases the positive emotions and positively affect learning (Heidig, Müller, & Reichelt, 2015). This can also promote students' engagement. Additionally, these technologies enable the production of high-quality videos with little to no post production. In this presentation, a short overview of relevant multimedia design principles is given. Examples of how to implement them in short form videos is demonstrated. Furthermore, a video setup for presenting effective online lectures and the production of videos with very little post-production needs is explained. REFERENCES  Dunleavy, S., Kestin, G., Callaghan, K., McCarty, L., & Deslauriers, L. (2022). Increased learning in a college physics course with timely use of short multimedia summaries. Physical Review Physics Education Research, 18(1), 010110. https://doi.org/10.1103/PhysRevPhysEducRes.18.010110 Guo, P. J., Kim, J., & Rubin, R. (2014). How video production affects student engagement: An empirical study of MOOC videos. Proceedings of the first ACM conference on Learning @ scale conference, 41–50. https://doi.org/10.1145/2556325.2566239 Heidig, S., Müller, J., & Reichelt, M. (2015). Emotional design in multimedia learning: Differentiation on relevant design features and their effects on emotions and learning. Computers in Human Behavior, 44, 81–95. https://doi.org/10.1016/j.chb.2014.11.009 Mayer, R. (2020). Multimedia Learning (3. Aufl.). Cambridge University Press. https://doi.org/10.1017/978131694135

The role of model risk in extreme value theory for capital adequacy

© 2016 Incisive Risk Information (IP) Limited. In the recent literature, methods from extreme value theory (EVT) have frequently been applied to the estimation of tail risk measures. While previous analyses show that EVT methods often lead to accurate estimates for risk measures, a potential drawback lies in large standard errors of the point estimates in these methods, as only a fraction of the data set is used. Thus, we comprehensively study the impact of model risk on EVT methods when determining the value-at-risk and expected shortfall. We distinguish between first-order effects of model risk, which consist of misspecification and estimation risk, and second-order effects of model risk, which refer to the dispersion of risk measure estimates, and show that EVT methods are less prone to first-order effects. However, they show a greater sensitivity toward secondorder effects.We find that this can lead to severe value-at-risk and expected shortfall underestimations and should be reflected in regulatory capital models

Specificity Between Lactobacilli And Hymenopteran Hosts Is The Exception Rather Than The Rule

Lactobacilli (Lactobacillales: Lactobacillaceae) are well known for their roles in food fermentation, as probiotics, and in human health, but they can also be dominant members of the microbiota of some species of Hymenoptera (ants, bees, and wasps). Honey bees and bumble bees associate with host-specific lactobacilli, and some evidence suggests that these lactobacilli are important for bee health. Social transmission helps maintain associations between these bees and their respective microbiota. To determine whether lactobacilli associated with social hymenopteran hosts are generally host specific, we gathered publicly available Lactobacillus 16S rRNA gene sequences, along with Lactobacillus sequences from 454 pyrosequencing surveys of six other hymenopteran species (three sweat bees and three ants). We determined the comparative secondary structural models of 16S rRNA, which allowed us to accurately align the entire 16S rRNA gene, including fast-evolving regions. BLAST searches and maximum-likelihood phylogenetic reconstructions confirmed that honey and bumble bees have host-specific Lactobacillus associates. Regardless of colony size or within-colony oral sharing of food (trophallaxis), sweat bees and ants associate with lactobacilli that are closely related to those found in vertebrate hosts or in diverse environments. Why honey and bumble bees associate with host-specific lactobacilli while other social Hymenoptera do not remains an open question. Lactobacilli are known to inhibit the growth of other microbes and can be beneficial whether they are coevolved with their host or are recruited by the host from environmental sources through mechanisms of partner choice.National Science Foundation PRFB-1003133, DEB-0919519Texas Higher Education Coordinating Board 01923, National Institutes of Health GM067317Integrative BiologyCellular and Molecular BiologyCenter for Computational Biology and BioinformaticsBrackenridge Field Laborator

Inflammatory bowel disease-specific autoantibodies in HLA-B27-associated spondyloarthropathies: Increased prevalence of ASCA and pANCA

Aims: An association between inflammatory bowel disease (IBD) and spondyloarthropathies (SpA) has repeatedly been reported. The aim of the present study was to investigate whether serologic markers of IBD, e. g. antibodies against Saccharomyces cerevisiae (ASCA), antibodies against exocrine pancreas (PAB) and perinuclear antineutrophil cytoplasmic antibodies (pANCA) are present in HLA-B27-associated SpA. Methods: 87 patients with HLA-B27-positive SpA and 145 controls were tested for ASCA, PAB and pANCA employing ELISA or indirect immunofluorescence, respectively. Antibody-positive patients were interviewed regarding IBD-related symptoms using a standardized questionnaire. Results/Conclusion: When compared to the controls, ASCA IgA but not ASCA IgG levels were significantly increased in patients with SpA, in particular in ankylosing spondylitis (AS) and undifferentiated SpA (uSpA). pANCA were found in increased frequency in patients with SpA whereas PAB were not detected. The existence of autoantibodies was not associated with gastrointestinal symptoms but sustains the presence of a pathophysiological link between bowel inflammation and SpA. Copyright (C) 2004 S. Karger AG, Basel

U.S. Radio in the 21st Century: Staying the Course in Unknown Territory

This essay examines the development of the radio industry in the United States as it makes its way into the 21st century. Issues of regulation, technology, commerce, and culture are addressed

Accessory Piriformis Muscle

Emily Scholl, Michael Kellner, David R. Terfera, and Kevin R. Kelliher's poster discussing the piriformis muscle.Faculty Research Day 2018: Doctoral Student Poster 2nd Plac

Photopolymerizable monomer formulations for nanoporous proton conducting membranes

Several monomers and crosslinker in a broad range of concentrations in water and 1-Methyl-2-pyrrolidone (NMP) respectively were screened for their mechanical properties, water uptake and conductivity by photo polymerization with a polar photo initiator in porous membranes made of polypropylene and polyethersulfone respectively. As conductive polymer, primarily poly(2-acrylamido-2-methylpropane sulfonic acid) (PAMPS) and poly(2-sulfoethyl methacrylate) (PSEM) respectively as well as polymers of phosphonic acid containing monomers or newly synthesized monomers were used. The conductive monomers were crosslinked with varying hydrophobic and hydrophilic multifunctional monomers like N,N'-methylene bisacrylamide (MBA), 2-Propenoic acid, 2-methyl-, 1,1'-(1,10-decanediyl) ester (D3MA) or polyethyleneglycol diacrylates with two varying chainlengths (PEG-DA700, PEG-DA330). Furthermore several new multifunctional crosslinker with enhanced thermal and ageing stability have been synthesized and tested.\ud The advantage of several different building blocks with known characteristics is the possibility to tune the polymer to special needs of an application. For example, some polymer compositions have good conductivity at lower temperatures whereas other polymers develop better properties at elevated temperatures

Low Mortality in Tall Tropical Trees

The dynamics of the tallest trees in tropical forests are of special interest due to their carbon content, canopy dominance, and the large canopy gaps created when they die. Known ecological mechanisms that may influence tall tree survival lead to conflicting predictions. Hydraulic stress and exposure to high winds and desiccation should increase death rates, yet the tallest trees have the greatest access to light and escape damage caused by falling boles and branches. The uncertainty in tall tree mortality rates has been difficult to address due to their low density, which makes mortality rates challenging to estimate accurately. Here, we use a combination of LiDAR remote sensing and field measurements to show that the mortality rate over 8.5 years among individuals \u3e40 m tall in 444 ha of lowland Neotropical rain forest was 1.2% per year, less than half the landscape-scale average for all canopy trees (2.7% per year). The low mortality is likely explained by species-specific traits that decrease the mortality risk and/or ecological advantages of height that outweigh the risks. Regardless of the mechanisms, the low mortality rate has important implications for tropical forest carbon budgets, as we estimated that a single tall individual represents 2–11% of total live aboveground carbon stocks per hectare. Our findings suggest that height-specific dynamics may be surprisingly different from traditional diameter-specific dynamics, emphasizing the importance of extending ecological studies to investigate the role of tree height in forest dynamics