A Test Bed for Evaluating the Performance of IoT Networks

The use of smaller, personal IoT networks has increased over the past several years. These devices demand a lot of resources but only have limited access. To establish and sustain a flexible network connection, 6LoWPAN with RPL protocol is commonly used. While RPL provides a low-cost solution for connection, it lacks load balancing mechanisms. Improvements in OF load balancing can be implemented to strengthen network stability. This paper proposes a test bed configuration to show the toll of frequent parent switching on 6LoWPAN. Contiki’s RPL 6LoWPAN software runs on STM32 Nucleo microcontrollers with expansion boards for this test bed. The configuration tests frequency of parent changes and packet loss to demonstrate network instability of different RPL OFs. Tests on MRHOF for RPL were executed to confirm the working configuration. Results, with troubleshooting and improvements, show a working bed. The laid-out configuration provides a means for testing network stability in IoT networks

Quality enhancement for e-learning courses: the role of student feedback

The collection of student feedback is seen as a central strategy to monitor the quality and standards of teaching and learning in Higher Education Institutions. The increasing use of technology to support face-to-face, blended and distance courses has led managers as well as practitioners to become increasingly concerned to identify appropriate ways of assuring the quality of this e-learning provision. This paper presents a study of the collection of student feedback in higher education elearning courses and the use of this feedback for quality assurance and enhancement. We carried out a series of case studies of the procedures in place in four e-learning courses, and in each case study we collected the quality assurance documentation and interviewed stakeholders (administrators, educational technologists, tutors and students). The comparative examination of these two sets of data showed that the main strategies for collecting student feedback - module evaluations and student representation - were both strongly affected by the distinctive features of the mode of delivery in e-learning courses, and as a consequence they were not able to adequately support quality enhancement. The remote location of the students impacted on both student representation and on the response rates for module evaluations. The enhancement function of the module evaluations were adversely affected by lack of appropriate course management arising from the disaggregation of course processes and the resulting ambiguity in the allocation of responsibilities

Under Whose Roof? Understanding the Living Arrangements of Children in Doubled-Up Households

A growing literature in family demography examines children\u27s residence in doubled-up (shared) households with extended family members and nonkin. This research has largely overlooked the role of doubling up as a housing strategy, with “hosts” (householders) providing housing support for “guests” living in their home. Yet, understanding children\u27s experiences in doubled-up households requires attention to host/guest status. Using the American Community Survey and Survey of Income and Program Participation, we identify the prevalence of children doubling up as hosts and guests in different household compositions (multigenerational, extended family, nonkin), show how this varies by demographic characteristics, and examine children\u27s patterns of residence across these household types. We find large variation by demographic characteristics. More disadvantaged children have higher rates of doubling up as guests than hosts, whereas more advantaged children have higher rates of doubling up as hosts than guests. Additionally, compared with hosts, guests more often use doubling up as a longer-term strategy; a greater share of guests live consistently doubled up over a three-year period, but those who do transition between household types experience more transitions on average than do hosts. Our findings show the importance of attending to both housing status and household composition when studying children living in doubled-up households

The stability bias effect amongst lie-tellers: Testing the ‘miscalibration’ and ‘strategic’ hypotheses

Unlike truth-tellers’ statements that show forgetting, lie-tellers’ statements appear less sensitive to delay. For lie-tellers, this failure to correctly simulate forgetting has been referred to as a stability bias. This experiment tests two explanations for this stability bias: the “miscalibration” hypothesis and the “strategic” hypothesis. Using a 2 (Task Type: Recall Estimate vs. Strategic Estimate) × 2 (Delay: Immediate vs. 3-week delay) design, participants (n = 142) either estimated how much detail a truth-teller might remember from an intelligence briefing (testing the miscalibration hypothesis), or how much detail was necessary to make a fabricated statement about the same intelligence briefing appear convincing to others (testing the strategic hypothesis). Before making these estimates, participants were informed that the briefing occurred immediately beforehand, or 3 weeks beforehand. Recall estimates correctly predicted forgetting would occur after a 3-week delay. Strategic estimates did not vary as a function of statement-time. No differences in subjective beliefs emerged. (PsycInfo Database Record (c) 2022 APA, all rights reserved

The spotlight effect and the illusion of transparency in social anxiety

[Clark, D. M., & Wells, A. (1995). A cognitive model of social phobia. In: R. G. Heimberg, M. R. Liebowitz, D. A. Hope, & F. R. Schneier (Eds.), Social phobia: diagnosis, assessment, and treatment (pp. 69–93). New York: Guildford Press] cognitive model of social phobia suggests that both public and private sources of information contribute to the construction of the self as a social object, which is thought to maintain the disorder. This study used two concepts developed in social psychology that might help to explain the processes that contribute to the development of this constructed self. These two concepts are the spotlight effect [Gilovich, T., Medvec, V. H., & Savitsky, K. (2000). The spotlight effect in social judgment: an egocentric bias in estimates of the salience of one’s own actions and appearance. Journal of Personality and Social Psychology, 78(2), 211–222] and the illusion of transparency [Gilovich, T., Medvec, V. H., & Savitsky, K. (1998). The Illusion of transparency: biased assessments of others’ ability to read one’s own emotional states. Journal of personality and social psychology, 75(2), 332–346]. Participants performed a memory task under either a low or a high social-evaluative condition. In the high social-evaluative condition, participants reported higher levels of the spotlight effect and more negative evaluation of task performance, compared to participants in the low social-evaluative condition. There were no differences between the two conditions in levels of the illusion of transparency. Surprisingly, however, in the low socialevaluative condition, participants reported higher levels of the illusion of transparency than the spotlight effect, whereas, in the high social-evaluative condition, they reported the opposite. Results suggest that the spotlight effect may be specific to social-evaluative concerns, whereas, the illusion of transparency may represent more general features of social anxiety concerns. Implications of the results for Clark and Wells’ cognitive model of social phobia model are discussed

A stability bias effect among deceivers

Research examining how truth tellers' and liars' verbal behavior is attenuated as a function of delay is largely absent from the literature, despite its important applied value. We examined this factor across 2 studies in which we examined the effects of a hypothetical delay (Experiment 1) or actual delay (Experiment 2) on liars' accounts. In Experiment 1 - an insurance claim interview setting - claimants either genuinely experienced a (staged) loss of a tablet device (n = 40) or pretended to have experienced the same loss (n = 40). Truth tellers were interviewed either immediately after the loss (n = 20) or 3 weeks after the loss (n = 20), whereas liars had to either pretend the loss occurred either immediately before (n = 20) or 3 weeks before (n = 20) the interview (i.e., hypothetical delay for liars). In Experiment 2 - a Human Intelligence gathering setting - sources had to either lie (n = 50) or tell the truth (n = 50) about a secret video they had seen concerning the placing of a spy device. Half of the truth tellers and liars where interviewed immediately after watching the video (n = 50), and half where interviewed 3-weeks later (n = 50; i.e., real delay for liars). Across both experiments, truth tellers interviewed after a delay reported fewer details than truth tellers interviewed immediately after the to-be-remembered event. In both studies, liars failed to simulate this pattern of forgetting and reported similar amounts of detail when interviewed without or after a delay, demonstrating a stability bias in reporting

Role of Ventral Subiculum in Context-Induced Relapse to Alcohol Seeking after Punishment-Imposed Abstinence

In many human alcoholics, abstinence is self-imposed because of the negative consequences of excessive alcohol use, and relapse is often triggered by exposure to environmental contexts associated with prior alcohol drinking. We recently developed a rat model of this human condition in which we train alcohol-preferring P rats to self-administer alcohol in one context (A), punish the alcohol-reinforced responding in a different context (B), and then test for relapse to alcohol seeking in Contexts A and B without alcohol or shock. Here, we studied the role of projections to nucleus accumbens (NAc) shell from ventral subiculum (vSub), basolateral amygdala, paraventricular thalamus, and ventral medial prefrontal cortex in context-induced relapse after punishment-imposed abstinence. First, we measured double-labeling of the neuronal activity marker Fos with the retrograde tracer cholera toxin subunit B (injected in NAc shell) and demonstrated that context-induced relapse is associated with selective activation of the vSub→NAc shell projection. Next, we reversibly inactivated the vSub with GABA receptor agonists (muscimol+baclofen) before the context-induced relapse tests and provided evidence for a causal role of vSub in this relapse. Finally, we used a dual-virus approach to restrict expression of the inhibitory κ opioid-receptor based DREADD (KORD) in vSub→NAc shell projection neurons. We found that systemic injections of the KORD agonist salvinorin B, which selectively inhibits KORD-expressing neurons, decreased context-induced relapse to alcohol seeking. Our results demonstrate a critical role of vSub in context-induced relapse after punishment-imposed abstinence and further suggest a role of the vSub→NAc projection in this relapse. SIGNIFICANCE STATEMENT In many human alcoholics, abstinence is self-imposed because of the negative consequences of excessive use, and relapse is often triggered by exposure to environmental contexts associated with prior alcohol use. Until recently, an animal model of this human condition did not exist. We developed a rat model of this human condition in which we train alcohol-preferring P rats to self-administer alcohol in one context (A), punish the alcohol-reinforced responding in a different context (B), and test for relapse to alcohol seeking in Contexts A and B. Here, we used neuroanatomical, neuropharmacological, and chemogenetic methods to demonstrate a role of ventral subiculum and potentially its projections to nucleus accumbens in context-induced relapse after punishment-imposed abstinence

The Regulatory Status of Genome-edited Crops

Genome editing with engineered nucleases (GEEN) represents a highly specific and efficient tool for crop improvement with the potential to rapidly generate useful novel phenotypes/traits. Genome editing techniques initiate specifically targeted double strand breaks facilitating DNA-repair pathways that lead to base additions or deletions by non-homologous end joining as well as targeted gene replacements or transgene insertions involving homology-directed repair mechanisms. Many of these techniques and the ancillary processes they employ generate phenotypic variation that is indistinguishable from that obtained through natural means or conventional mutagenesis; and therefore, they do not readily fit current definitions of genetically engineered or genetically modified used within most regulatory regimes. Addressing ambiguities regarding the regulatory status of genome editing techniques is critical to their application for development of economically useful crop traits. Continued regulatory focus on the process used, rather than the nature of the novel phenotype developed, results in confusion on the part of regulators, product developers, and the public alike and creates uncertainty as of the use of genome engineering tools for crop improvement

Family employment and child socioemotional behaviour: longitudinal findings from the UK Millennium Cohort Study

Background Levels of paid employment in two parent and lone parent families have increased in the UK but evidence of its impact on child socioemotional behaviour is limited and inconsistent. Methods We conducted a longitudinal analysis using the first four sweeps of the Millennium Cohort Study (9 months, 3 years, 5 years and 7 years) to investigate the influence of family employment trajectories in the early years on socioemotional behaviour at 7 years, unadjusted and adjusted for covariates. In addition, mothers’ employment was investigated separately. Results Children from families where no parent was employed for one or more sweeps were at a greater risk of socioemotional problem behaviour compared with those where a parent was continuously employed, even after adjustment for covariates. Children of mothers who were non-employed for one or more sweeps were at greater risk of problem behaviour compared with mothers who were employed at all sweeps. Adjustment for covariates fully attenuated the excess risk for children whose mothers had moved into employment by the time they were 7 years. In contrast, the elevated risk associated with continuous non-employment and a single transition out of employment was attenuated after adjustment for early covariates, fathers’ employment, household income and mothers’ psychological distress at 7 years, but remained significant. Conclusions Family and mothers’ employment were associated with a lower risk of problem behaviour for children in middle childhood, in part explained by sociodemographic characteristics of families and the apparent psychological and socioeconomic benefits of employment. Results for mothers’ transitions in or out of the labour market suggest that child problem behaviour is influenced by current status, over and above diverse earlier experiences of employment and non-employment