| 1. |
- Carlsson, Fredrik, 1968, et al.
(författare)
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Conformity and the demand for environmental goods
- 2008
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- We test the hypothesis that people conform to certain social norms, i.e. that some individuals may be willing to pay a higher price premium for green products the more widespread green consumerism is in society. To investigate consumer preferences for environmentally friendly products, we conducted a choice experiment where the respondents were asked to choose among coffee products varying with respect to their share of ecological beans, share of fair trade beans, and price. Three treatments were used, differing only in the information given about the choices made by other consumers. More specifically, the respondents in the three subgroups were told that 10%, 50%, and 90% of all other consumers chose the alternative with 100% ecological beans. We find different responses to the treatments across individuals. In particular, we can only confirm our hypothesis of conformity for women, although men appear to have stronger preferences for ecological coffee than women.
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| 2. |
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| 3. |
- Carlsson, Fredrik, 1968, et al.
(författare)
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Discrimination in Scientific Review - A natural field experiment on blind versus non-blind review
- 2009
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- This paper analyzes the impacts of gender, as well as other author characteristics, on reviewers’ grading of papers submitted to an international conference in economics in Sweden in 2008. Correcting for other variables, including country and research field as well as researcher academic level, we focus on the difference in grades between blind and non-blind review treatments. We find little effect of non-blind reviewing and no significant evidence of gender or any other type of discrimination. Furthermore, we do not find any significant difference between the average grading by female and male reviewers.
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| 4. |
- Carlsson, Henrik, 1979-, et al.
(författare)
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A General Virtual Manufacturing Concept for Programming, Verification and Optimisation of Complex Control Functions
- 2008
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Ingår i: Proceedings of the 18th International Conference on Flexible Automation and Intelligent Manufacturing, FAIM 2008: June 30th - July 2nd, 2008, University of Skövde, Sweden. - Skövde. - 9789163327575 ; , s. 668-675
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Konferensbidrag (refereegranskat)abstract
- This paper describes a general virtual manufacturing concept for industrial control systems. Our virtual manufacturing concept provides a distinct advantage; programming, verification and optimisation of complex real-time dependent control functions described by real control code, which can be directly transferred to the real manufacturing system. To achieve this distinct advantage, a time synchronised virtual manufacturing system is a necessity. The aim of this paper is thus to present and to describe in detail, our proposed virtual manufacturing concept. To the authors’ knowledge no such general virtual manufacturing concept, i.e. one that can correctly handle complex real-time dependent control functions, currently exists. To summarise previous work related to virtual manufacturing and industrial control systems, several critical issues have been identified. The virtual manufacturing concept proposed in this paper addresses these issues. To verify that our concept can manage these critical issues found and further is suitable in industrial applications a virtual manufacturing test case is also presented. The test case, that includes motion control (i.e. servo), complex control functions, real control systems etc., was carried out with success.
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| 5. |
- Carlsson, Henric, 1979-, et al.
(författare)
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General Time Synchronisation Method for PLC Programs Aiming at Virtual Verification and Development
- 2008
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Ingår i: 17th IFAC World. - 9783902661005 ; , s. 4440-4445
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- The latest state-of-the-art Computer Aided Production Engineering (CAPE) simulation technology offers OPC integration for PLC verification. A critical drawback with this technology has been identified and described within this paper. A new time synchronisation method and a simulation architecture are therefore presented and proposed. The time synchronisation method together with the architecture can be used when verifying and developing real-time dependent control logic for industrial control system, e.g. PLC with CAPE tools. The method described in this paper is general and should work on any PLCs that are compatible with the IEC 61131-3 standard. A test case was also carried out, showing that by disregarding time synchronisation it is impossible to verify real-time dependent PLC functions together with CAPE tools in a reliable way. However, the test case also shows that by applying the proposed time synchronisation method together with the described simulation architecture a successful industrial verification method is achieved
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| 6. |
- Ericsson, Mikael, 1975-, et al.
(författare)
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Off-line programming of robots for metal deposition
- 2005
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Ingår i: Trends in welding research. - 0871708426 ; , s. 629-634
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Metal Deposition (MD) is a rapid prototyping technique to build parts by depositing metal in a required fashion. When a complex-shaped part is to be built, a simulation tool is needed to define robot trajectories. Three different simulation-based methods for robot trajectory generation are introduced and compared in this study. The methods are; reversed milling, adapted rapid prototyping and application programming in a computer aided robotics software. All methods were shown capable of creating robot paths for complex shapes, with the CAR software approach being the most flexible. Using this method, the geometry to be built is automatically sliced into layers and a robot path is automatically generated. The method was tentatively evaluated and appears to provide a powerful technique in the design and optimisation of robot paths for MD. Experiments showed that it is possible to manufacture fully dense parts using an Nd-Yag laser.
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