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Sökning: db:Swepub > Övrigt vetenskapligt/konstnärligt > Mälardalens universitet

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41.
  • Ahl, Linda, 1970- (författare)
  • Approaching Curriculum Resources : Examining the potential of textbooks and teacher guides to support mathematics learning and teaching
  • 2014
  • Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • The driving forces of conducting the two studies presented in this thesis are: the strong position of curriculum resources in the mathematics classroom in general; teachers’ faith in curriculum resources to convey the intentions and goals of mathematics education; and the expected benefits to mathematics education through expanding the knowledge base of research in the area of curriculum resources in general, and teacher guides in particular. This thesis builds upon two studies conducted in Sweden. The first is a study on how teachers use teacher guides. The results of this study could be seen as one piece in the building of a theoretical understanding of how teachers use their tools in planning and enacting teaching. The data for Study I were collected through semi-structured interviews with five early-years mathematics teachers. In advance, the teachers were asked to copy the pages from the teacher guide they had used the week before the interview. The analysis of the interviews shows that less experienced teachers desire a wider scope of content in their teacher guide. More experienced teachers desire support from teaching activities, in the design of teaching in classroom practice. Another interesting result was that all teachers in our study, regardless of prior experience, knowledge, beliefs, etc., want the teacher guide to offer connections between theory and practice. The second study investigates what content is represented in Swedish textbooks. The results of this study map the terrain over how the most commonly used textbooks in Sweden construct the topic of proportion and proportional reasoning. My choice of textbooks is based on a questionnaire among all compulsory school mathematics teachers in the sixth largest municipality in Sweden, revealing that two curriculum resources together covered 97% of the classrooms in Grades 7-9. The study provides insights into the strengths and weaknesses in the presented structure regarding proportional reasoning in the most commonly used textbooks in Swedish lower secondary school. Teachers could use these insights when making decisions about how to use their textbooks, and to possibly reconsider how to organize the enactment of the national curriculum in order to develop deep understanding. The analyses could provide authors of teacher guides and textbooks with valuable information to consider regarding structure and design.
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42.
  • Ahl, Linda, 1970- (författare)
  • The Potential of Dominating Mathematics Textbooks in Sweden to Support the Learning and Teaching of Proportional Reasoning
  • Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
    • Proportional reasoning is a cornerstone in compulsory mathematics education. It is considered to be one of the most challenging topics to tech and learn. This article discusses the potential of two Swedish textbooks to support the teaching and learning of proportion and proportional reasoning. Since curricular resources, such as textbooks are teachers’ most important tools for planning and enacting lessons; the support they offer has great impact on how teaching and learning will be designed. To analyze the textbooks examined here, I use a framework developed by Shield and Dole, based on research. The study provides insights of the strengths and weaknesses in the presented structure regarding proportional reasoning in the most commonly used textbooks in Swedish lower secondary school. Teachers could use these insights, when making decisions about how to use their textbooks. This study is likely to map the terrain of Sweden, due to the textbooks widespread use.
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43.
  • Ahlberg, Carl (författare)
  • Embedded high-resolution stereo-vision of high frame-rate and low latency through FPGA-acceleration
  • 2020
  • Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • Autonomous agents rely on information from the surrounding environment to act upon. In the array of sensors available, the image sensor is perhaps the most versatile, allowing for detection of colour, size, shape, and depth. For the latter, in a dynamic environment, assuming no a priori knowledge, stereo vision is a commonly adopted technique. How to interpret images, and extract relevant information, is referred to as computer vision. Computer vision, and specifically stereo-vision algorithms, are complex and computationally expensive, already considering a single stereo pair, with results that are, in terms of accuracy, qualitatively difficult to compare. Adding to the challenge is a continuous stream of images, of a high frame rate, and the race of ever increasing image resolutions. In the context of autonomous agents, considerations regarding real-time requirements, embedded/resource limited processing platforms, power consumption, and physical size, further add up to an unarguably challenging problem.This thesis aims to achieve embedded high-resolution stereo-vision of high frame-rate and low latency, by approaching the problem from two different angles, hardware and algorithmic development, in a symbiotic relationship. The first contributions of the thesis are the GIMME and GIMME2 embedded vision platforms, which offer hardware accelerated processing through FGPAs, specifically targeting stereo vision, contrary to available COTS systems at the time. The second contribution, toward stereo vision algorithms, is twofold. Firstly, the problem of scalability and the associated disparity range is addressed by proposing a segment-based stereo algorithm. In segment space, matching is independent of image scale, and similarly, disparity range is measured in terms of segments, indicating relatively few hypotheses to cover the entire range of the scene. Secondly, more in line with the conventional stereo correspondence for FPGAs, the Census Transform (CT) has been identified as a recurring cost metric. This thesis proposes an optimisation of the CT through a Genetic Algorithm (GA) - the Genetic Algorithm Census Transform (GACT). The GACT shows promising results for benchmark datasets, compared to established CT methods, while being resource efficient.
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44.
  • Ahlberg, Carl, et al. (författare)
  • The Black Pearl: An Autonomous Underwater Vehicle
  • 2013
  • Rapport (övrigt vetenskapligt/konstnärligt)abstract
    • The Black Pearl is a custom made autonomous underwater vehicle developed at Mälardalen University, Sweden. It is built in a modular fashion, including its mechanics, electronics and software. After a successful participation at the RoboSub competition in 2012 and winning the prize for best craftsmanship, this year we made minor improvements to the hardware, while the focus of the robot's evolution shifted to the software part. In this paper we give an overview of how the Black Pearl is built, both from the hardware and software point of view.
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45.
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46.
  • Ahlskog, Mats, 1970-, et al. (författare)
  • Manufacturing Technology Readiness Assessment
  • 2015
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • The purpose of this paper is to analyze and discuss how the MRL scale can support the assessment of a manufacturing technology’s maturity level. A single case study within the manufacturing industry has been conducted investigating the use of a MRL scale. An assessment of MRL 4 has been studied.
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47.
  • Ahlskog, Mats, 1970- (författare)
  • Supporting pre-development of new manufacturing technologies
  • 2015
  • Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • In today’s tough industrial environment, efficient development of new products and new manufacturing solutions is necessary to stay competitive on a global market. Manufacturing companies use substantial money and development resources to develop new products. However, the resources spent on finding and implementing emerging manufacturing technologies are much more limited. This is often the case even though it is well known that a way of competing on a global market is through the introduction of new manufacturing technologies that can improve product quality as well as contribute to reducing manufacturing time, resulting in reduced product price and in the end increased profit.When introducing new manufacturing technologies, different challenges arise such as lack of knowledge, involvement of an external equipment supplier, etc. In addition, time-to-volume is critical when introducing new manufacturing technologies in a manufacturing context. To be able to have a fast ramp-up, manufacturing technology needs to be mature enough and at the same time meet all requirements. Efficient introduction of new manufacturing technologies requires that pre-development activities have been performed in advance.Previous research in this area highlights a lack of knowledge and solutions regarding pre-development of new manufacturing technologies. Such pre-development is important in order to have a successful introduction, fast time-to-volume and production system development. Based on these challenges, the objective of the research presented in this thesis is to develop support for pre-development of new manufacturing technologies.The research is based on literature reviews and three empirical case studies, carried out over a two-year period of time. The first empirical case study was an exploratory case study in the manufacturing industry. The purpose of that research study was to identify critical factors forcing manufacturing companies to improve the development of manufacturing technologies.The second study was a longitudinal embedded case study in the manufacturing industry with the purpose of identifying factors that affect evaluation of new manufacturing technologies during new product development. Particular attention was given to the product development process and how it has affected the evaluation of new manufacturing technologies.Finally, the third study was a single case study in the manufacturing industry with the purpose of analysing and discussing the assessment of the maturity level of a manufacturing technology.
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48.
  • Ahlskog, Mats, 1970- (författare)
  • The fuzzy front end of manufacturing technology development : Exploring the link between the known and the unknown
  • 2017
  • Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • It is well known that a way of competing on a global market is through the introduction of new manufacturing technologies in the production system that can improve product quality as well as contribute to reducing manufacturing time, reduced product price and in the end increased profits. Manufacturing companies that develop and introduce new manufacturing technologies can differentiate themselves from others and thus achieve increased competitiveness.The fuzzy front end of manufacturing technology development is characterized by a high degree of technology uncertainty and challenges due to the lack of access to relevant knowledge, lack of a structured development process, and enough resources that are working with development of new manufacturing technologies.In the literature only a few empirical studies that explore the fuzzy front end of manufacturing technology development can be found. Prior research highlights that little is actually known about what should be done in the fuzzy front end of manufacturing technology development projects, and thus more research is needed. Supporting the fuzzy front end of manufacturing technology development is important to facilitate a successful introduction of new manufacturing technologies, fast time-to-volume and long-term production system development.Based on the above-mentioned importance of developing new manufacturing technology, the objective of the research presented in this thesis is to explore the fuzzy front end of manufacturing technology development. In order to fulfil the objective, empirical data were collected from five case studies conducted in the manufacturing industry. During the empirical studies four important parts were studied: organising, knowledge development, collaboration and the development process.The main findings revealed that development of new manufacturing technology is often conducted in collaboration with external partners and many ad hoc decisions are taken due to lack of a predefined development process for the fuzzy front end of manufacturing technology development. In addition, in the fuzzy front end access to relevant manufacturing knowledge is important and knowledge needs to be developed in order to reduce technology uncertainty.In order to support the fuzzy front end of manufacturing technology development projects, a supporting framework has been developed. The proposed framework is an elaboration of results from the research questions addressed and can be used as a guideline to overcome the challenges observed in the fuzzy front end of manufacturing technology development projects. The framework is built on two important dimensions for innovations, degree of technology uncertainty and degree of novelty. The critical factors identified in the analysis are embedded in the proposed framework as central parts in the fuzzy front end of manufacturing technology development.
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49.
  • Ahlström, Karin, 1964- (författare)
  • How Meetings affect the accomplishment of Broad Responsibility in a municipal Company
  • Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
    • Municipal companies are important actors in the pursuit of the Agenda 2030 goals and are often formally obliged by their owners to work in this direction. This has however shown to be quite challenging, and managers lack knowledge about how to develop new ways of organizing to meet such responsibilities. The aim of this article is therefore to understand how the work of a top management team in meetings affects the accomplishment of broad responsibility. The analysis, which is underpinned by a communicative constitution of organizing (CCO) perspective, shows how the way specific communicative practices (agendas, minutes, timeslots, turn-taking, and stakeholder voicing) are enacted leads to the re-production of parts of the organization at the expense of the whole, the present at the expense of the future, and profit at the expense of the other dimensions of sustainability. This study contributes to the literature on public management by showing how communicative practices enacted in meetings make certain concerns present and others absent, thereby creating the conditions for the accomplishment of broad responsibility.
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50.
  • Ahlström, Karin (författare)
  • Managing broad responsibility together in a municipal company : Communication as prophylaxis
  • 2024
  • Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • Municipal companies are important actors in the pursuit of the goals of Agenda 2030 and are often formally obliged by their owners to work towards achieving these goals, but without jeopardizing ongoing production and the delivery of vital public services. This has, however, shown to be challenging, and managers are often unsure how to develop new ways of organizing to meet such complex challenges and take on broad responsibility. What has been recognized is the importance of collaboration, which is a beneficial and distinct organizational form of its own that creates value greater than what individual organizations can do separately. Such ways of working are, however, hardly straightforward endeavours, since they usually involve members with contrasting goals and approaches, are inclined to fragmentation, and can sometimes even add to the challenges they set out to resolve. The aim of this thesis is to understand the practical challenges associated with collaborative efforts to manage broad responsibility in a municipal company. In response to this aim, responsible managing is studied both empirically and through a research literature review. The purpose of the literature review is to better understand the challenges of managing broad responsibility and what is currently being done to achieve the goals of Agenda 2030 at the municipal level. To understand how responsible managing is accomplished in practice, the enactment of responsible manging is empirically studied in a municipal company over a total of four years. Particularly, two cases have been studied using a participatory research approach: first, the case of a top management team managing responsibly together and second, the case of responsible managing in interorganizational collaboration in a municipal company. For both cases, a theoretical lens is used, resting on a social constructionist and processual-relational ontology, supported by practice-based studies in the communicative stream. This means that attention is focused on communication (both talk and text) in an approach that views responsible managing as a communicative practice, a form of emergent, relational, and situated practice and the means by which responsible managing emerges, is sustained, and transformed. The overall results show how situated communicative practices are influential for preventing the limitation of broad responsibility, fragmentation of the share responsibility, and the deprioritization of obligations over time. Based on this, a metaphor of dental prophylaxis is proposed. By conceptualizing responsible managing as a situated communicative practice and showing how responsible managing may be enacted, this thesis contributes theoretically to the field of organization and management.
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