Situating graphs as workplace knowledge

We investigate the use and knowledge of graphs in the context of a large industrial factory. We are particularly interested in the question of "transparency", a question that has been extensively considered in the general literature on tool use, and more recently, by Michael Roth and his colleagues in the context of scientific work. Roth uses the notion of transparency to characterise instances of graph use by highly educated scientists in cases where the context was familiar: the scientists were able to read the situation "through" the graph. This paper explores the limits of the validity of the transparency metaphor. We present two vignettes of actual graph use by a factory worker, and contrast his actions and knowledge with that of a highly-qualified process engineer working on the same production line. We note that in neither case were the graphs transparent. We argue that a fuller account that describes a spectrum of transparency is needed, and we seek to achieve this by adopting some elements of a semiotic approach that enhance a strictly activity-theoretical view

Improving work processes by making the invisible visible

Increasingly, companies are taking part in process improvement programmes, which brings about a growing need for employees to interpret and act on data representations. We have carried out case studies in a range of companies to identify the existence and need of what we call Techno-mathematical Literacies (TmL): functional mathematical knowledge mediated by tools and grounded in the context of specific work situations. Based on data gathered from a large biscuit manufacturing and packaging company, we focus our analysis here on semiotic mediation within activity systems and identify two sets of related TmL: the first concerns rendering some invisible aspects visible through the production of mathematical signs; the second concerns developing meanings for action from an interpretation of these signs. We conclude with some more general observations concerning the role that mathematical signs play in the workplace. The nee

Attributing meanings to representations of data: the case of statistical process control

This article is concerned with the meanings that employees in industry attribute to representations of data and the contingencies of these meanings upon context. Our primary concern is to characterise more precisely how the context of the industrial process is constitutive of the meaning of graphs of data derived from this process. We draw on data from a variety of sources including ethnographic studies of workplaces and reflections on the design of prototype learning activities supplemented by insights obtained from trying out these activities with a range of employees. The core of this article addresses how different groups of employees react to graphs used as part of statistical process control, focussing in particular on the meanings they ascribe to mean, variation, target, specification, trend and scale as depicted in the graphs. Using the notion of boundary crossing we try to characterise a method that helps employees to communicate about graphs and come to data-informed decisions

Techno-mathematical literacies in the workplace: a critical skills gap

There has been a radical shift in the mathematical skills required in modern workplaces. With the ubiquity of IT, employees now require Techno-mathematical Literacies, the mastery of new kinds of mathematical knowledge shaped by the systems that govern their work. The education system does not fully recognise these skills, employees often lack them, and companies struggle to improve them. This project has developed prototype learning resources to train a variety of employees in the mathematical awareness and knowledge that today’s employment require

Characterizing the use of mathematical knowledge in boundary crossing situations at work

The first aim of this paper is to present a characterisation of techno-mathematical literacies needed for effective practice in modern, technology-rich workplaces that are both highly automated and increasingly focused on flexible response to customer needs. The second aim is to introduce an epistemological dimension to activity theory, specifically to the notions of boundary object and boundary crossing. In this paper we draw on ethnographic research in a pensions company and focus on data derived from detailed analysis of the diverse perspectives that exist with respect to one symbolic artefact, the annual pension statement. This statement is designed to facilitate boundary crossing between company and customers. Our study showed that the statement routinely failed in this communicative role, largely due to the invisible factors of the mathematical-financial models underlying the statement that are not made visible to customers, or to the customer enquiry team whose task is to communicate with customers. By focusing on this artefact in boundary-crossing situations, we identify and elaborate the nature of the techno-mathematical knowledge required for effective communication between different communities in one financial services workplace, and suggest the implications of our findings for workplaces more generally

Measuring chemotaxis in Borrelia burgdorferi the Lyme disease spirochete

Borrelia burgdorferi is the spirochete causative agent of Lyme disease. The chemotaxis and motility systems of these bacteria are far less well described than that of Escherichia coli or Salmonella enterica. This dissertation explores the role of the CheA proteins in the chemotactic response and describes the first defined attractants for B. burgdorferi.;In order to test hypotheses, we developed or optimized three protocols. To characterize the motion of cells, two motion tracking systems were optimized. The Hobson BacTracker allowed for tracking cell motions in real time. This hardware/software chimera, while powerful for the specific application, utilizes a cumbersome interface. Therefore, the software package Volocity was adopted. While the tracking itself is somewhat slower, the interface greatly facilitates data collection, organization, and presentation, making it much faster. To assay chemotaxis with the capillary tube assay, one must enumerate cells. This was previously difficult because cell enumeration was slow, laborious, and ineffectual at low concentrations. We overcame these limitations by initially developing a protocol for enumerating cells by flow cytometry. Once this enumeration method was validated with direct comparisons to Petroff-Hausser counting chamber data, we were able to screen for attractants using a modified capillary tube assay.;We found that B. burgdorferi mutants in cheA2 were non-chemotactic to defined attractants. Complementation of cheA2 restored the wild-type phenotype. Mutants in cheA1 failed to show any discernable phenotype. The modified capillary tube chemotaxis assay was used to screen for chemoattractants. To date serine, glycine, N-n-diacetyl-chitobiose, glucose, glutamate, putricine, spermidine, rabbit serum, and glucosamine, have been tested, the latter five had at least some chemoattractant ability. Finally, this is the first work to correlate the ability of the cells to reverse with chemotaxis.;In conclusion, this work developed techniques to track the motion of B. burgdorferi and measure the chemotactic response with a high throughput assay. These tools are being used in a screen of compounds which has already found 5 specific compounds that act as chemoattractants. The techniques developed will be useful not only for B. burgdorferi, but will facilitate measuring the chemotactic response in other slow growing prokaryotic species

From Scripture to Fantasy: Adrian Johnston and the Problem of Continental Fundamentalism

Abstract: Only the rise of science allowed us to identify scriptural ontologies as fantastic conceits, as anthropomorphizations of an indifferent universe. Now that science is beginning to genuinely disenchant the human soul, history suggests that traditional humanistic discourses are about to be rendered fantastic as well. Via a critical reading of Adrian Johnston's ‘transcendental materialism,' I attempt to show both the shape and the dimensions of the sociocognitive dilemma presently facing Continental philosophers as they appear to their outgroup detractors. Trusting speculative a priori claims regarding the nature of processes and entities under scientific investigation already excludes Continental philosophers from serious discussion. Using such claims, as Johnston does, to assert the fundamentally intentional nature of the universe amounts to anthropomorphism. Continental philosophy needs to honestly appraise the nature of its relation to the scientific civilization it purports to decode and guide, lest it become mere fantasy, or worse yet, conceptual religion

Forces on Obstacles in Rotor Wake – A GARTEUR Action Group

The paper describes the objectives and the structure of the GARTEUR Action Group HC/AG-22 project which deals with the basic research about the forces acting on obstacles when immersed in rotor wakes. The motivation started from the observation that there was a lack of experimental databases including the evaluation of the forces on obstacles in rotor wakes; and of both numerical and experimental investigations of the rotor downwash effects at medium-to-high separation distances from the rotor, in presence or without sling load. The four research centres: CIRA (I); DLR (D); NLR (NL); ONERA (F); and three universities: NTUA (GR); Politecnico di Milano (I); University of Glasgow (UK) created a team for the promotion of activities that could contribute to fill these gaps. In particular, both numerical and experimental investigations were proposed by the team to study, primarily, the effects of the confined area geometry on a hovering helicopter rotor, and, secondarily, the downwash and its influence on the forces acting on a load, loose or slung, at low to high separation distances from the rotor disc. The following activities were planned: a) application and possible improvement of computational tools for the study of helicopter rotor wake interactions with obstacles; b) set-up and performance of four cost-effective wind tunnel test campaigns aimed at producing a valuable experimental database for the validation of the numerical methodologies applied; c) final validation of the numerical methodologies. The project started in November 2014 and has a duration of three years

Non-tariff barriers and consumer prices: evidence from Brexit

Non-Tariff Barriers (NTBs) are the main policy impediment to international trade, yet little is known about their pass-through to prices. This paper exploits the Brexit trade policy shock to quantify how NTBs affect consumer prices and welfare. The increase in NTBs raised prices by 6%, implying a pass-through of 50-80%. Based on a standard welfare framework, we show households lost £5.84bn, domestic producers gained £4.78bn, and £1.06bn was lost through deadweight loss. Due to differences in food expenditure shares, households in the lowest decile experience a 52% higher increase in the cost of living than households in the top decile