Error Correction for Cooperative Data Exchange

This paper considers the problem of error correction for a cooperative data exchange (CDE) system, where some clients are compromised or failed and send false messages. Assuming each client possesses a subset of the total messages, we analyze the error correction capability when every client is allowed to broadcast only one linearly-coded message. Our error correction capability bound determines the maximum number of clients that can be compromised or failed without jeopardizing the final decoding solution at each client. We show that deterministic, feasible linear codes exist that can achieve the derived bound. We also evaluate random linear codes, where the coding coefficients are drawn randomly, and then develop the probability for a client to withstand a certain number of compromised or failed peers and successfully deduce the complete message for any network size and any initial message distributions

Characteristics of a Viscous Damper: Finding the Damping Coefficient

The authors of this report are undergraduate Architectural Engineering students at California Polytechnic State University in San Luis Obispo. This report documents the implementation, design, and experimentation of a damper with unknown properties. This experimentation data will be used to find the damping coefficient of a viscous damper alongside damping characteristics. Using knowledge from previous courses, this report focuses on dynamic responses through an assumed viscous damper. Through forced oscillatory motion testing with specified frequency and amplitude using the seismic shake table and equipment, compactDAQ instrumentation, and damper, values can be pulled from the data experimentation, which can be used to numerically or analytically derive a coefficient of damping

Fidelity Assessment in Community Programs: An Approach to Validating Simplified Methodology.

Fidelity to intervention protocol is linked to best outcomes for individuals with autism spectrum disorder (ASD; see Boyd & Corley [Autism 5(4):430-441, 2001]; Pellecchia et al. [J Autism Dev Disord 45(9):2917-2927, 2015]); however, fidelity measurement tools that are both accurate and feasible for community use are often not available. In this paper we explore methods for validated simplification of fidelity assessment procedures toward the goal of increased use in clinical practice. Video recordings (n = 36) of therapists working with children with ASD were coded using three variations of fidelity assessment methodology (trial-by-trial, 5-point Likert Scale, and 3-point Likert Scale), and the results were compared for exact agreement, mastery criterion agreement, and overall reliability. The results indicated overall a very high percentage of exact agreement (mean 99.44%, range 94.4-100%) and excellent reliability (mean Krippendorff's alpha [Kα] 1.0) between the trial-by-trial and 5-point Likert Scale across all components; however, the 3-point method may be viewed as being the more feasible strategy within community programs

Perspectives on Teaching the Family Communication Course

This article discusses what undergraduate students enrolled in a family communication course should learn. It is intended to provide readers with a general direction on how to design or teach a family communication course so that students understand a communication-centered approach to family. This article highlightssome of the foundational theories and concepts grounding most family communication courses, content areas typically addressed when considering the family communication course, possible assignments that might be useful in teaching the course, and relevant issues related to teaching family communication. If instructors thoughtfully consider content and assignment decisions in the family communication course, they have the potential to help students think about family communication in more nuanced and informed ways as they navigate family bonds as scholars and practitioners

Climate and Anthropogenic Controls of Coastal Deoxygenation on Interannual to Centennial Timescales

Understanding dissolved oxygen variability in the ocean is limited by the short duration of direct measurements; however, sedimentary oxidation‐reduction reactions can provide context for modern observations. Here we use bulk sediment redox‐sensitive metal enrichment factors (MoEF, ReEF, and UEF) and scanning X‐ray fluorescence records to examine annual‐scale sedimentary oxygen concentrations in the Santa Barbara Basin from the Industrial Revolution (Common Era ~1850) to present. Enrichments are linked to measured bottom water oxygen concentrations after 1986. We reveal gradual intensification of the coastal oxygen minimum zone (OMZ) on the southern California margin coinciding with the twentieth century anthropogenic warming trend that leads to reduced oxygen solubility and greater stratification. High‐frequency interannual oscillations become more prominent over the last three decades. These are attributed to local “flushing events” triggered by the transition from El Niño to La Niña conditions, which further amplify changes in the extratropical southern Californian OMZ.Key PointsDirect bottom water observations corroborate the annual reconstruction of Southern California OMZ through sedimentary redox proxy recordsAnthropogenic warming intensifies coastal OMZs, reducing oxygen solubility and aggravating stratificationEl Niño–Southern Oscillation (ENSO) plays a role in interannual oxygen variability in extratropical coastal OMZPlain Language SummaryBecause we have only been measuring the amount of oxygen in seawater for a few decades, we do not know whether humans have caused oxygen in the ocean to decrease. The chemistry of some metals in sediments records how much oxygen was present in the ocean in the past, as these metals form solids when oxygen is low. We use these metals to determine that the oxygen in the bottom water of the Santa Barbara Channel, California, has decreased since about 1850. This occurs because warmer water reduces the amount of oxygen that can dissolve with in it, while also creating a barrier that reduces contact with the oxygen‐rich atmosphere. Over the last 35 years oxygen in the bottom water of the Santa Barbara Channel has briefly increased when El Niño weather conditions shift to La Niña conditions allowing cool, dense water into the depths of the channel.Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/141972/1/grl56641.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/141972/2/grl56641_am.pd

Local delivery of FTY720 from tissue derived matrices for bone graft integration

Despite advances in bone grafting technology for musculoskeletal injury, re-injury or incomplete healing persists. Efforts to modify bone allografts sing proteins and growth factors show improvement in wound healing outcomes. We use FTY720, an agonist of S1P receptors 1 and 3, to improve bone graft integration through bone regeneration and vascularization. Four methods of delivering FTY720 into a bone defect are described: 1) FTY720 loaded onto a PLAGA-coated bone allograft and implanted in a critical size rat cranial defect; 2) FTY720 loaded onto a PLAGA-coated bone allograft and implanted in a rat tibial defect; 3) FTY720 loaded into a Matrigel plug and injected into a mouse tibial fracture; and 4) FTY720 directly adsorbed to human bone xenografts and implanted in a critical size rat cranial defect. In each of these models, FTY720 release was characterized, and bone regeneration and vascularization was monitored within the defect. Additionally, local tissue composition and immune response was evaluated. The results presented here indicate that FTY720 released locally into the bone defect improved new bone formation and vascularization, promoting improved graft integration.M.S