THE CONTEXTS OF LEARNING IN CITIZEN SCIENCE

In citizen science, project leaders rely on volunteer contributors to collect, classify, and analyze data in both natural and digital environments. To be successful, volunteers are often provided with specialized training that supports the learning goals of the project. Yet, little is understood regarding the contextual influences of both the project and the volunteer that affect what those learning goals are and how they are supported. Additionally, the use of technology to deliver and support learning opportunities to volunteers is increasingly relied upon regardless of the project\u27s physical setting. However, the degree to which the transition to digital supports for volunteer learning has been successfully leveraged by projects to meet their unique goals and the needs of their volunteers has not been thoroughly examined. Unlike much of the research that is available, this exploratory study examined volunteer learning from a different perspective, that of the citizen science project leader, and investigated the influences at play that impact the project’s volunteer learning goals and the project’s ability to support those objectives. Through semi-structured interviews with project leadership and the analyses of digital and physical documents, this study revealed the need for a new framework to better understand how the personal, social, organizational, and physical contexts of the project and their volunteers impact a citizen science project’s approach to volunteer learning. This dissertation introduces the Contextual Model of Citizen Science Learning to meet this need

Economic orthodoxy and the East Asian crisis

It is now clear that the economic crisis that struck East Asia so suddenly and violently at the end of 1997 has irrevocably altered the political and economic landscape of the region. Major Asian companies have gone bankrupt, anxious domestic and foreign investors have relocated vast amounts of capital abroad, interest rates have skyrocketed, and inflation and unemployment have soared. At the same time, the economic crisis has also led to the collapse of several governments within the region. In South Korea, an opposition party led ..

Preparation of perfluorinated 1,2,4-oxadiazoles

Fluorinated alkyl or alkylether 1,2,4 oxadiazole compounds are prepared by cyclizing the corresponding alkyl or alkylether imidoyl amidoximes in vacuo or in an inert atmosphere at a temperature within the range of 40 C to 100 C. for a period of 8 to 144 hours in the presence of an acid compound which can accept ammonia to form a salt. The imidoyl amidoximes usable in this process are either polymeric or nonpolymeric. The products, when polymeric, have excellent heat, chemical and solvent resistance

Phish Finders: Improving Cybersecurity Training Tools Using Citizen Science

Malicious web content includes phishing emails, social media posts, and websites that imitate legitimate sites. Phishing attacks are rising, and human-centered phishing risk mitigation is often an afterthought eclipsed by technical system-centric efforts like firewalls. Training tools can be deployed for combating phishing but often lack sufficient labeled training content. Using signal detection theory, this paper assesses the feasibility of using citizen science and crowdsourcing volunteers to label images for use in cybersecurity training tools. Crowd volunteer performance was compared to gold standard content and prior studies of Fortune 500 company employees. Findings show no significant statistical differences between crowd volunteers and corporate employees\u27 performance on gold standard content in identifying phishing. Based on these findings, citizen scientists can be valuable for generating annotated images for cybersecurity training tools

The effect of sampling rate on observed statistics in a correlated random walk

Tracking the movement of individual cells or animals can provide important information about their motile behaviour, with key examples including migrating birds, foraging mammals and bacterial chemotaxis. In many experimental protocols, observations are recorded with a fixed sampling interval and the continuous underlying motion is approximated as a series of discrete steps. The size of the sampling interval significantly affects the tracking measurements, the statistics computed from observed trajectories, and the inferences drawn. Despite the widespread use of tracking data to investigate motile behaviour, many open questions remain about these effects. We use a correlated random walk model to study the variation with sampling interval of two key quantities of interest: apparent speed and angle change. Two variants of the model are considered, in which reorientations occur instantaneously and with a stationary pause, respectively. We employ stochastic simulations to study the effect of sampling on the distributions of apparent speeds and angle changes, and present novel mathematical analysis in the case of rapid sampling. Our investigation elucidates the complex nature of sampling effects for sampling intervals ranging over many orders of magnitude. Results show that inclusion of a stationary phase significantly alters the observed distributions of both quantities

The meaning of care for older Chinese caregivers : an exploratory model of positive caring

Caring is often a highly personalized and individual activity. Through in-depth and searching interviews with two older care-givers, this study explored the determinants that help to sustain cares in their long-term care role and proposes an explanatory model for sustaining care. Attempts were made to uncover those meanings held by Chinese care-givers in interpreting their roles in a positive way despite the enormous demands placed on them by care-giving or, if they interpreted their care giving negatively, the attitudes that sustained their giving of care. Narrative accounts were obtained through separate interviews (conducted by two experienced social workers) asking open-ended questions guided by prescribed themes (determinants). Content coverage included basic demographic variables: sex, income, education level, religion, age; family responsibility/reciprocity, doing what needs to be done, caring personality, satisfaction and gratification, friendship and company, improved relationship, personal growth and identifying specific rewards of care-giving for self (i.e. the care-giver). The respondents were asked to describe all the above in relation to providing the care as they themselves perceive these domains, then were encouraged to provide a detail explanation for how these domains were encouraging/ discouraging them to continue to care. Similar description and explanation given by the two care-givers were extracted as congruent to the prescribed themes- hence these consistent findings serve to inform the formation of a crude explanatory model for care givers’ commitment to long term care. The study also informs practice in identifying and sustaining good care-givers

CD1d-dependent immune suppression mediated by regulatory B cells through modulations of iNKT cells

Regulatory B cells (Breg) express high levels of CD1d that presents lipid antigens to invariant natural killer T (iNKT) cells. The function of CD1d in Breg biology and iNKT cell activity during inflammation remains unclear. Here we show, using chimeric mice, cell depletion and adoptive cell transfer, that CD1d–lipid presentation by Bregs induces iNKT cells to secrete interferon (IFN)-γ to contribute, partially, to the downregulation of T helper (Th)1 and Th17-adaptive immune responses and ameliorate experimental arthritis. Mice lacking CD1d-expressing B cells develop exacerbated disease compared to wild-type mice, and fail to respond to treatment with the prototypical iNKT cell agonist α-galactosylceramide. The absence of lipid presentation by B cells alters iNKT cell activation with disruption of metabolism regulation and cytokine responses. Thus, we identify a mechanism by which Bregs restrain excessive inflammation via lipid presentation

Long Meg : rock art recording using 3D laser scanning

This article focuses on the results obtained from the laser scanning recording of the Long Meg standing stone (NY56933716, CCSMR6154, NMR 23663) (Cumbria). This recording is result of the project “Breaking through rock art recording: three dimensional laser scanning of megalithic rock art”, led by Margarita Díaz-Andreu and sponsored by the AHRC under the Innovation Awards scheme, aimed to explore the potential of this novel technique. In this article two different methods to visualise the rock art data are compared: one using freely available software, and the other one employing software especially developed for archaeology

Quantitative Chevalley-Weil theorem for curves

The classical Chevalley-Weil theorem asserts that for an \'etale covering of projective varieties over a number field K, the discriminant of the field of definition of the fiber over a K-rational point is uniformly bounded. We obtain a fully explicit version of this theorem in dimension 1.Comment: version 4: minor inaccuracies in Lemma 3.4 and Proposition 5.2 correcte