| 1. |
- Andersson, Alf, et al.
(författare)
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Inline Process Control – a concept study of efficient in-line process control and process adjustment with respect to product geometry
- 2016
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Ingår i: Swedish Production Symposium 2016 SPS 2016. - Lund, Sweden.
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Konferensbidrag (refereegranskat)abstract
- All manufacturing processes have variation which may violate the fulfillment of assembly, functional, geometrical or esthetical requirements and difficulties to reach desired form in all areas. The cost for geometry defects rises downstream in the process chain. Therefore, it is vital to discover these defects as soon as they appear. Then adjustments can be done in the process without losing products or time. In order to find a solution for this, a project with the overall scope “development of an intelligent process control system” has been initiated. This project consists of five different work packages: Inline measurement, Process Evaluation, Corrective actions, Flexible tooling and demonstrator cell. These work packages address different areas which are necessary to fulfill the overall scope of the project. The system shall both be able to detect geometrical defects, propose adjustments and adjust simple process parameters. The results are demonstrated in a demo cell located at Chalmers University of Technology. In the demonstrator all the different areas have been verified in an industrial case study – assembly of GOR Volvo S80. Efficient offline programming for robot based measurement, efficient process evaluation based on case base reasoning (CBR) methodology, flexible fixtures and process adjustments based on corrective actions regarding in going part positioning.
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| 2. |
- Bauer, Andrej, et al.
(författare)
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The HoTT Library : A formalization of homotopy type theory in Coq
- 2017
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Ingår i: Proceedings of the 6th ACM SIGPLAN Conference on Certified Programs and Proofs. - New York, NY, USA : Association for Computing Machinery (ACM). - 9781450347051 ; , s. 164-172
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Konferensbidrag (refereegranskat)abstract
- We report on the development of the HoTT library, a formalization of homotopy type theory in the Coq proof assistant. It formalizes most of basic homotopy type theory, including univalence, higher inductive types, and significant amounts of synthetic homotopy theory, as well as category theory and modalities. The library has been used as a basis for several independent developments. We discuss the decisions that led to the design of the library, and we comment on the interaction of homotopy type theory with recently introduced features of Coq, such as universe polymorphism and private inductive types.
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| 3. |
- de Jong, Roelof S., et al.
(författare)
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4MOST-4-metre Multi-Object Spectroscopic Telescope
- 2014
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Ingår i: Ground-based and Airborne Instrumentation for Astronomy V. - : SPIE. - 0277-786X .- 1996-756X. ; 9147
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Konferensbidrag (refereegranskat)abstract
- 4MOST is a wide-field, high-multiplex spectroscopic survey facility under development for the VISTA telescope of the European Southern Observatory (ESO). Its main science drivers are in the fields of galactic archeology, high-energy physics, galaxy evolution and cosmology. 4MOST will in particular provide the spectroscopic complements to the large area surveys coming from space missions like Gaia, eROSITA, Euclid, and PLATO and from ground-based facilities like VISTA, VST, DES, LSST and SKA. The 4MOST baseline concept features a 2.5 degree diameter field-of-view with similar to 2400 fibres in the focal surface that are configured by a fibre positioner based on the tilting spine principle. The fibres feed two types of spectrographs; similar to 1600 fibres go to two spectrographs with resolution R> 5000 (lambda similar to 390-930 nm) and similar to 800 fibres to a spectrograph with R> 18,000 (lambda similar to 392-437 nm & 515-572 nm & 605-675 nm). Both types of spectrographs are fixed-configuration, three-channel spectrographs. 4MOST will have an unique operations concept in which 5 year public surveys from both the consortium and the ESO community will be combined and observed in parallel during each exposure, resulting in more than 25 million spectra of targets spread over a large fraction of the southern sky. The 4MOST Facility Simulator (4FS) was developed to demonstrate the feasibility of this observing concept. 4MOST has been accepted for implementation by ESO with operations expected to start by the end of 2020. This paper provides a top-level overview of the 4MOST facility, while other papers in these proceedings provide more detailed descriptions of the instrument concept[1], the instrument requirements development[2], the systems engineering implementation[3], the instrument model[4], the fibre positioner concepts[5], the fibre feed[6], and the spectrographs[7].
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| 4. |
- Hirche, Johannes, et al.
(författare)
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Adaptive interface for text input on large-scale interactive surfaces
- 2008
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Ingår i: 2008 IEEE International Workshop on Horizontal Interactive Human-Computer System. - Piscataway, NJ : IEEE Communications Society. - 9781424428977 ; , s. 163-166
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Konferensbidrag (refereegranskat)abstract
- In this paper we present a novel approach to text input on large interactive surfaces using a combination of strategies to resolve the inherent difficulties with text input on such a device. Instead of using a conventional full size QWERTY based layout, the idea is to use a very limited set of buttons that, by using word prediction and hints, would only require minimal finger movement. The input mechanism is somewhat related to input methods employed when using keyboards with a limited size and amount of keys, commonly found in phones and other 10 digit keyboards. Given that the main motivation to this approach was not the limited size but rather to overcome the difficult task of locating keys with fingers on a flat and featureless surface, making touchtyping very difficult and requiring frequent visual monitoring of the finger position, we opted to enhance the interaction with easily made gestures, a layout that adapts to the hand anatomy of the user, and easy control over the text prediction.
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| 5. |
- Knees, Peter, et al.
(författare)
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A Reproducibility Study On User-Centric Mir Researchand Why It Is Important
- 2022
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Ingår i: Proceedings of the 23rd ISMIR Conference, Bengaluru, India, December 4-8, 2022. ; , s. 764-771
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Konferensbidrag (refereegranskat)abstract
- Reproducibility of results is a central pillar of scientific work. In music information retrieval research, this is widely acknowledged and practiced by the communityby re-implementing algorithms and re-validating machine learning experiments. In this paper, we argue for an increased need to also reproduce the results and findings of user studies, including qualitative work, especially since these often lay the foundations and serve as justification for choices taken in algorithmic design and optimization criteria. As an example, we attempt to reproduce the study by Kim et al. [1] presented in the RecSys (2020) paper "Do Channels Matter? Illuminating Interpersonal Influence on Music Recommendations". By repeating this study on how interpersonal relationships can affect a user’s assessment of music recommendations on a new sample of n = 142 participants, we can largely confirm and support the validity of the original results. At the same time, we extend the analysis and also observe differences with regards to adoption rates between different channels as well as different factors that influences the adoption rate. From this specific reproducibility study, we conclude that potential cultural differences should be accounted for more explicitly in future studies and that systems development should be more explicitly connected to its intended target audience.
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| 6. |
- Krause, Markus, et al.
(författare)
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Large area piezoelectric impact sensors
- 2012
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Ingår i: Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP. ; , s. 681-683
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Konferensbidrag (refereegranskat)abstract
- Printed electronics is an active area of research which enables production of electrical devices on various substrates. The use of highly insulating materials and the employment of dielectric phenomena based on the piezo- and pyroelectric effect in polar insulators promise large area sensors useful in protection sensor systems to save pedestrians. In this paper we propose a car safety system based on printed piezo- and pyroelectric sensors. Their use in pedestrian saving systems is exemplified by a toy-car-demonstrator. The sensors are based on ferroelectric polymers, printed on flexible PET substrates. The piezoelectric coefficients of the printed ferroelectric polymer film are typically 25 pC/N, sufficient for impact detection in car crash situations. The sensor speed is very fast, enabling efficient protection mechanisms to safe the life of pedestrians. The simple and potentially low cost fabrication is advantageous in comparison to systems currently available on the market.
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| 7. |
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| 8. |
- Tilsted, Joachim Peter, et al.
(författare)
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Narrating decarbonisation: Stories of climate action in the petrochemical industry
- 2022
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Konferensbidrag (refereegranskat)abstract
- Despite its role in ensuring the ubiquity of fossil fuels in modern society, the petrochemical sector has long flown under the public radar in energy and climate debates. However, faced with increasing pressures from its involvement in driving multiple and intersecting ecological crises, firms in the petrochemical industry are seeking to make sustainability a core part of their public image. Although recent climate commitments might signal a start towards a low-carbon transition, there is a risk that industry leaders follow the pattern that has consistently been the case throughout their history and only pay lip service to current trends to ease legislative pressure, secure financing and continue business as usual, legitimizing the strong carbon lock-in within the sector. Therefore, this paper aims to identify and explore commonly invoked industry narratives of climate action. To do so, we focus on climate communication from the largest petrochemical companies, most of which also are fossil fuel extractors, mapping their discursive strategy. We argue that the set of strategic narratives that we identify portray the petrochemical industry as of unquestionable societal importance, promoting the idea that stringent regulation is not needed, and that criticism leveraged against the industry are based on misunderstandings. This discourse strategy works to reduce pressure for deep mitigation cuts while repositioning the industry as part of the solution. Relating this to the broader literature on the use of discursive power and corporate framing of climate change, we compare the discursive strategy around petrochemical production to that of fossil fuel extraction. Despite relying on fossil feedstock and being solidly placed in the fossil-based energy order with strong historical, knowledge-based, and economic linkages to oil, gas, and coal, discursive strategies in key aspects. In making this argument, we show how downstream actors work to legitimize continued exploration and production of fossil fuels.
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| 9. |
- Tilsted, Joachim Peter, et al.
(författare)
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Networks in global socio-technical regimes: Addressing petrochemicals
- 2021
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Konferensbidrag (refereegranskat)abstract
- Connecting actors across sectors, scales and decision-making arenas, complex global networks make up central elements of the social structure of earth system governance. Taking a relational perspective, the notion of global socio-technical regimes places networks within the centre of discussions on stability and change. Described as dominant institutional rationalities diffusing through internationalized networks, regimes work to stabilize global socio-technical systems. The configuration of the networks through which regimes are diffused and maintained help decide both how actors resist and respond to change. Aiming to substantiate debates on architecture and agency in global governance, this article explores the role of internationalised networks in maintaining carbon lock-in, focusing on the petrochemical industry. As the industry is both highly globalised and networked with strong intersectoral ties to the fossil fuel and plastics sectors, the petrochemical sector constitutes a unique avenue for understanding how global networks influence environmental issues across sectors. The fact that petrochemicals are not well addressed by the existing institutional architecture across decisionmaking arenas point to the importance of understanding what structures governs the industry at the global scale.Constituting a critical gap in research and policy, the petrochemical sector has often been overlooked in energy debates, despite being the most energy intensive industry of all. Used across industrial processes, petrochemicals play a critical role in maintaining fossil fuel lockin by ensuring the ubiquity of oil, gas, and coal in provisioning systems. We analyse global MNC-networks through joint ownership interlocks in the global chemical industry. Using a dataset containing the subsidiaries of the top 50 largest chemical firms, we demonstrate that not only is the sector highly connected on a global scale with all major companies being formally integrated through joint ownership, interlocks across value chains also works to maintain the value of fossil capital. Moreover, realising that the capacity for agency differs, we assess the network structure including homophily and polycentricity as well as the specific configurations to understand which actors are in the most structurally advantageous positions. Through this analysis, we contribute to the understanding of global networks as a specific governance challenge. The findings underline the need for parallel transitions in different socio-technical systems including energy, chemicals, and plastics to break from fossil fuel dependency and achieve decarbonisation. This requires addressing the global governance architecture around plastics and fossil fuels respectively to recognise and tackle the role of petrochemicals in maintaining fossil fuel lock-in.
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| 10. |
- Tilsted, Joachim Peter, et al.
(författare)
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Networks in global socio-technical regimes : Ownership interlocks in the petrochemical industry
- 2021
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Konferensbidrag (refereegranskat)abstract
- Internationalised networks constitute a central aspect of global socio-technical systems and the governing and organisation of global markets. Yet, their role in sustainability transitions has not received much attention in the transition studies literature. To inform and expand recent theorisation on the global nature of socio-technical regimes, this paper engages with role of global networks in upholding contemporary patterns of production and consumption. It does so in two ways. First, through reviewing how networks are conceptualised in the sustainability transitions as well as the global value chain and global production network literatures, we seek to illustrate how transition studies can gain from work that address power dynamics and economic materiality in global corporate networks. Secondly, by analysing corporate ownership networks across lead firms in the global petrochemical sector and demonstrating how interlocks across value chains work to maintain the value of fossil capital, we illustrate the role of inter-sectoral global MNC networks and the configuration of these in maintaining and reproducing fossil fuel lock-in. The findings point to a need for taking such relations into account when pursuing parallel transitions across socio-technical systems including energy, chemicals, and plastics to break from fossil fuel dependency and accelerate decarbonisation efforts.
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