The purpose of the present study was to investigate the effect and use of distributed practice in the context of self-regulated mathematical learning in high school. With distributed practice, a fixed learning duration is spread over several sessions, whereas with massed practice, the same time is spent learning in one session. Distributed practice has been proven to be an effective tool for improving long-term retention of verbal material and simple procedural knowledge in mathematics, (...) at least when the practice schedule is externally guided. In the present study, distributed practice was investigated in a context that required a higher degree of self-regulation. In total, 158 secondary school students were invited to participate. After motivational and cognitive characteristics of the students were assessed, the students were introduced to basic statistics, a topic of their regular curriculum. At the end of the introduction, the students could sign up for the study to further practice this content. Eighty-seven students did so and were randomly assigned either to the distributed or to the massed practice condition. In the distributed practice condition, they received three practice sets on three different days. In the massed practice condition, they received the same three sets, but all on one day. All exercises were worked in the context of self-regulated learning at home. Performance was tested two weeks after the last practice set. Only 44 students finished the study, which hampered the analysis of the effect of distributed practice. The characteristics of the students who completed the exercises were analyzed exploratory: The proportion of students who finished all exercises was significantly higher in the massed than in the distributed practice condition. Within the distributed practice condition, a significantly larger proportion of female students completed the exercises compared to male students. Additionally, among these female students, a larger proportion showed lower concentration difficulty. No such differential effects were revealed in the massed practice condition. Our results suggest that the use of distributed practice in the context of self-regulated learning might depend on learner characteristics. Accordingly, distributed practice might obtain more reliable effects in more externally guided learning contexts. (shrink)

Farm to School (FTS) programs are increasingly popular as methods to teach students about food, nutrition, and agriculture by connecting students with the sources of the food that they eat. They may also provide opportunity for farmers seeking to diversify market channels. Food service buyers in FTS programs often choose to procure food for school meals directly from farmers. The distribution practices required for such direct procurement often bring significant transaction costs for both school food service professionals and farmers. Analysis (...) of data from a survey of Vermont farmers who sell directly to school food services explores farmers’ motivations and distribution practices in these partnerships. A two-step cluster analysis procedure characterizes farmers’ motivations along a continuum between market-based and socially embedded values. Further bivariate analysis shows that farmers who are motivated most by market-based values are significantly associated with distribution practices that facilitate sales to school food services. Implications for technical assistance to facilitate these sales are discussed. (shrink)

In 1968, Jürgen Habermas claimed that, in an advanced technological society, the emancipatory force of knowledge can only be regained by actively recovering the ‘forgotten experience of reflection’. In this article, we argue that, in the contemporary situation, critical reflection requires a deliberative ambiance, a process of mutual learning, a consciously organised process of deliberative and distributed reflection. And this especially applies, we argue, to critical reflection concerning a specific subset of technologies which are actually oriented towards optimising human (...) cognition. In order to create a deliberative ambiance, fostering critical upstream reflection on emerging technologies, we developed the concept of a mutual learning exercise. Building on a number of case studies, we analyse what an MLE involves, both practically and conceptually, focussing on key aspects such as ambiance and expertise, the role of ‘genres of the imagination’ and the profiles of various ‘subcultures of debate’. Ideally, an MLE becomes a contemporary version of the Socratic agora, providing a stage where multiple and sometimes unexpected voices and perspectives mutually challenge each other, in order to strength-en the societal robustness and responsiveness of emerg-ing technologies. (shrink)

In this paper we present a set of good practices in the design of a security-centric architecture for a Communication Channel that can be used to secure a Loosely-Coupled distributed platform, over unreliable communication mediums. The proposed practices are derived from designing a complete architecture that is modular and designed to support principles of Service Oriented Architecture (SOA) and the common functional requirements of a wide range of applications, including cybersecurity, smart power grids and industrial Internet of Things (IoT). (...) The architecture was developed and implemented as part of the BIECO project, and is based around open standards such as Open Platform Communications United Architecture (OPC-UA). The key feature of the architecture is that it enables secure asynchronous near-real-time communication between a large number of nodes in a multimodal setup, without the need of any Service to know its place within the tool-chain. Based on our experience with building this system and based on the good results obtained, we are presenting a list of lessons learnt, recommendations for better communication channel modules within loosely coupled distributed systems. (shrink)

In theory and practice, the notion of fairness is far from simple. The principle is often elusive and subject to confusion, even in institutions of law, usage, and custom. In Fairness, Nicholas Rescher aims to liberate this concept from misunderstandings by showing how its definitive characteristics prevent it from being absorbed by such related conceptions as paternalistic benevolence, radical egalitarianism, and social harmonization. Rescher demonstrates that equality before the state is an instrument of justice, not of social utility or (...) public welfare, and argues that the notion of fairness stops well short of a literal egalitarianism. Rescher disposes of the confusions arising from economists' penchant to focus on individual preferences, from decision theorists' concern for averting envy, and from political theorists' sympathy for egalitarianism. In their place he shows how the idea of distributive equity forms the core of the concept of fairness in matters of distributive justice. The coordination of shares with valid claims is the crux of the concept of fairness. In Rescher's view, this means that the pursuit of fairness requires objective rather than subjective evaluation of the goods being shared. This is something quite different from subjective equity based on the personal evaluation of goods by those laying claim to them. Insofar as subjective equity is a concern, the appropriate procedure for its realization is a process of maximum value distribution. Further, Rescher demonstrates that in matters of distributive justice, the distinction between new ownership and preexisting ownership is pivotal and calls for proceeding on very different principles depending on the case. How one should proceed depends on context, and what is adjudged fair is pragmatic, in that there are different requirements for effectiveness in achieving the aims and purposes of the sort of distribution that is intended. Rescher concludes that fairness is a fundamentally ethical concept. Its distinctive modus operandi contrasts sharply with the aims of paternalism, preference-maximizing, or economic advantage. Fairness will be of interest to philosophers, economists, and political scientists. "[Fairness is] one of the most forceful conceptual analysis of fairness yet produced." -Ludwig Beckman, The Review of Metaphysics Nicholas Rescher is University Professor of Philosophy and vice chairman of the Center for Philosophy of Science at the University of Pittsburgh. He has written more than seventy books in various areas of philosophy, including Complexity: A Philosophical Overview and Inquiry Dynamics, both published by Transaction. (shrink)