Merhi M.I.,Indiana University at South Bend
Computers and Education | Year: 2015
Podcast, which is one of the technologies that was developed for personal entertainment or for information usage, has become one of the fastest growing technologies in distance learning over the past several years. Using the Technology Acceptance Model and Diffusion of Innovation Theory as base models, this study investigates the technological, individual, and social aspects that influence the adoption of podcast use in education. Previous research on podcast use in education attempted to study its adoption and diffusion; however, these studies have been rather isolated small case studies than a holistic, integrative research. This study overcomes this limitation by examining the student podcast adoption with survey data collected from 352 students in a higher education institution using a comprehensive model. The hypotheses were confirmed using structural equation modeling analytical procedures and the findings supported the proposed model. Based on the findings, implications for theory and practices are discussed. ©2014 Elsevier Ltd. All rights reserved.
Olson K.R.,Indiana University at South Bend
American Journal of Physiology - Regulatory Integrative and Comparative Physiology | Year: 2011
Hydrogen sulfide (H2S) has become the hot new signaling molecule that seemingly affects all organ systems and biological processes in which it has been investigated. It has also been shown to have both proinflammatory and anti-inflammatory actions and proapoptotic and anti-apoptotic effects and has even been reported to induce a hypometabolic state (suspended animation) in a few vertebrates. The exuberance over potential clinical applications of natural and synthetic H2S-"donating" compounds is understandable and a number of these function-targeted drugs have been developed and show clinical promise. However, the concentration of H2S in tissues and blood, as well as the intrinsic factors that affect these levels, has not been resolved, and it is imperative to address these points to distinguish between the physiological, pharmacological, and toxicological effects of this molecule. This review will provide an overview of H2S metabolism, a summary of many of its reported "physiological" actions, and it will discuss the recent development of a number of H2S-donating drugs that show clinical potential. It will also examine some of the misconceptions of H2S chemistry that have appeared in the literature and attempt to realign the definition of "physiological" H2S concentrations upon which much of this exuberance has been established. © 2011 the American Physiological Society.
Chen S.,Indiana University at South Bend |
Zhang Y.-T.,University of Notre Dame
Journal of Computational Physics | Year: 2011
Integration factor methods are a class of " exactly linear part" time discretization methods. In [Q. Nie, Y.-T. Zhang, R. Zhao, Efficient semi-implicit schemes for stiff systems, Journal of Computational Physics, 214 (2006) 521-537], a class of efficient implicit integration factor (IIF) methods were developed for solving systems with both stiff linear and nonlinear terms, arising from spatial discretization of time-dependent partial differential equations (PDEs) with linear high order terms and stiff lower order nonlinear terms. The tremendous challenge in applying IIF temporal discretization for PDEs on high spatial dimensions is how to evaluate the matrix exponential operator efficiently. For spatial discretization on unstructured meshes to solve PDEs on complex geometrical domains, how to efficiently apply the IIF temporal discretization was open. In this paper, we solve this problem by applying the Krylov subspace approximations to the matrix exponential operator. Then we apply this novel time discretization technique to discontinuous Galerkin (DG) methods on unstructured meshes for solving reaction-diffusion equations. Numerical examples are shown to demonstrate the accuracy, efficiency and robustness of the method in resolving the stiffness of the DG spatial operator for reaction-diffusion PDEs. Application of the method to a mathematical model in pattern formation during zebrafish embryo development shall be shown. © 2011 Elsevier Inc.
Blouin D.D.,Indiana University at South Bend
Anthrozoos | Year: 2013
This paper examines the variations in dog owners' attitudes toward, treatment of, and interactions with, animals. Based on 28 in-depth interviews with dog owners from a county in the Midwestern United States, I demonstrate that pets are an important part of many people's lives, often providing companionship, entertainment, and meaningful interactions; however, there are notable, distinct variations in how people relate to them. Pet owners typically exhibit one of three orientations toward pets: "dominionistic," "humanistic," or "protectionistic." The dominionistic have relatively low regard for their pets, valuing them primarily for the uses they provide, such as protection. Those employing the humanistic orientation elevate their pets to the status of surrogate humans and value their pets primarily for the affective benefits they enjoy from their close attachments. The protectionistic have high regard for both pets and animals more generally. They view pets as valuable companions and as creatures with their own interests. This typology offers insights for understanding the source and variety of the often ambiguous and contradictory relations between people and pets. I argue that individual characteristics and experiences impact how people understand and relate to animals, in large part, because they represent exposure to different cultural messages. I suggest that these orientations represent three sets of distinct cultural logics, each with distinct histories and contemporary sources. © ISAZ 2013.
Schimmrigk R.,Indiana University at South Bend
Communications in Mathematical Physics | Year: 2011
The program of constructing spacetime geometry from string theoretic modular forms is extended to Calabi-Yau varieties of dimensions three and four, as well as higher rank motives. Modular forms on the worldsheet can be constructed from the geometry of spacetime by computing the L-functions associated to omega motives of Calabi-Yau varieties, generated by their holomorphic n-forms via Galois representations. The modular forms that emerge in this way are related to characters of the underlying rational conformal field theory. The converse problem of constructing space from string theory proceeds in the class of diagonal theories by determining the motives associated to modular forms in the category of pure motives with complex multiplication. The emerging picture suggests that the L-function can be viewed as defining a map between the geometric category of motives and the category of conformal field theories on the worldsheet. © 2011 Springer-Verlag.