| 11. |
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| 12. |
- Adamson, Göran, et al.
(författare)
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Adaptive Assembly Feature Based Function Block Control of Robotic Assembly Operations
- 2012
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Ingår i: The 13th Mechatronics Forum International Conference Proceedings. - Linz : TRAUNER Verlag. - 9783990330425 ; , s. 8-13
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Konferensbidrag (refereegranskat)abstract
- Many manufacturing systems are exposed to a variety of unforeseen changes, negatively restricting their performances. External variations depending on market demand (e.g. changes in design, quantity and product mix) and internal variations in production capability and flexibility (e.g. equipment breakdowns, missing/worn/broken tools, delays and express orders) all contribute to an environment of uncertainty. In these dynamically changing environments, adaptability is a key feature for manufacturing systems to be able to perform at a maximum level, while keeping unscheduled downtime to a minimum. Targeting manufacturing equipment adaptability, this paper reports an assembly feature (AF) based approach for robotic assembly, using IEC 61499 compliant Function Blocks (FBs). Through the use of a network of event-driven FBs, an adaptive controller system for an industrial gantry robot’s assembly operations has been designed, implemented and tested. Basic assembly operations have been mapped as AFs into Assembly Feature Function Blocks (AF-FBs). Through their combination in FB networks, they can be aggregated to perform higher level assembly tasks. The AF-FBs dynamic execution and behavior can be adaptively controlled through embedded eventdriven algorithms, enabling the ability of adaptive decisions to handle unforeseen changes in the runtime environment.
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| 13. |
- Adamson, Göran, 1958-, et al.
(författare)
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Adaptive robotic control in cloud environments
- 2014
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Ingår i: FAIM 2014 - Proceedings of the 24th International Conference on Flexible Automation and Intelligent Manufacturing. - Lancaster, Pennsylvania, USA : DEStech Publications Inc. - 9781605951737 ; , s. 37-44
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Konferensbidrag (refereegranskat)abstract
- The increasing globalization is a trend which forces manufacturing industry of today to focus on more cost-effective manufacturing systems and collaboration within global supply chains and manufacturing networks. Cloud Manufacturing (CM) is evolving as a new manufacturing paradigm to match this trend, enabling the mutually advantageous sharing of resources, knowledge and information between distributed companies and manufacturing units. Providing a framework for collaboration within complex and critical tasks, such as manufacturing and design, it increases the companies' ability to successfully compete on a global marketplace. One of the major, crucial objectives for CM is the coordinated planning, control and execution of discrete manufacturing operations in a collaborative and networked environment. This paper describes the overall concept of adaptive Function Block control of manufacturing equipment in Cloud environments, with the specific focus on robotic assembly operations, and presents Cloud Robotics as "Robot Control-as-a-Service" within CM.
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| 14. |
- Adamson, Göran, et al.
(författare)
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Event-Driven Adaptability using IEC 61499 in Manufacturing Systems
- 2012
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Ingår i: Proceedings of The 5th International Swedish Production Symposium, SPS12. - Linköping : The Swedish Production Academy. - 9789175197524 ; , s. 453-460
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Konferensbidrag (refereegranskat)abstract
- Different kinds of uncertainty, such as variations in manufacturing capability and functionality, as well as changes in demand, make up a dynamically changing environment for many manufacturing systems of today. The ability to adapt to these unforeseen changes, through dynamic decision-making as well as dynamic control capabilities based on the use of real-time manufacturing information and intelligence, is vital to be able to perform at a competitive level while reducing unscheduled downtime. The event-driven Function Block (FB) model of the IEC 61499 standard, as opposed to the time-triggered and data-driven concept of IEC 61331, supports this approach, making it possible to handle, in a responsive and adaptive way, different kinds of uncertainty. Our objective is to develop methodologies for distributed, adaptive and dynamic process planning as well as machine monitoring and control for machining and assembly operations, using event-driven FBs. The implementation and testing of FB-based control for manufacturing equipment has been successfully realized in prototype systems, with control of both CNC machining and robotic assembly operations. The approach of using IEC 61499 FBs for adaptive control in other applications is also investigated, as an adaptive decision support system for operators at manufacturing facilities is under development. We strongly believe that IEC 61499 will play a major role in the shift to adaptive manufacturing systems.
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| 15. |
- Adamson, Göran, 1958-, et al.
(författare)
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Function Block Approach for Adaptive Robotic Control in Virtual and Real Environments
- 2014
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Ingår i: Proceedings of the 14th Mechatronics Forum International Conference, Mechatronics 2014. - Karlstad : Karlstads universitet. - 9789170635649 ; , s. 473-479
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Konferensbidrag (refereegranskat)abstract
- Many manufacturing companies are facing an increasing amount of changes and uncertainty, caused by both internal and external factors. Frequently changing customer and market demands lead to variations in manufacturing quantities, product design and shorter product life-cycles, and variations in manufacturing capability and functionality contribute to a high level of uncertainty. The result is unpredictable manufacturing system performance, with an increased number of unforeseen events occurring in these systems. Such events are difficult for traditional planning and control systems to satisfactorily manage. For scenarios like these, with a dynamically changing manufacturing environment, adaptive decision making is crucial for successfully performing manufacturing operations. Relying on real-time information of manufacturing processes and operations, and their enabling resources, adaptive decision making can be realized with a control approach combining IEC 61499 event-driven Function Blocks (FBs) with manufacturing features. These FBs are small decision-making modules with embedded algorithms designed to generate the desired equipment control code. When dynamically triggered by event inputs, parameter values in their data inputs are forwarded to the appropriate algorithms, which generate new events and data output as control instructions. The data inputs also include monitored real-time information which allows the dynamic creation of equipment control code adapted to the actual run-time conditions on the shop-floor. Manufacturing features build on the concept that a manufacturing task can be broken down into a sequence of minor basic operations, in this research assembly features (AFs). These features define atomic assembly operations, and by combining and implementing these in the event-driven FB embedded algorithms, automatic code generation is possible. A test case with a virtual robot assembly cell is presented, demonstrating the functionality of the proposed control approach.
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| 16. |
- Adamson, Göran, et al.
(författare)
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The state of the art of cloud manufacturing and future trends
- 2013
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Ingår i: ASME 2013 International Manufacturing Science and Engineering Conference Collocated with the 41st North American Manufacturing Research Conference, MSEC 2013. - : ASME - The American Society of Mechanical Engineers. - 9780791855461
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Konferensbidrag (refereegranskat)abstract
- Cloud manufacturing has emerged as a new manufacturing paradigm, which combines technologies (such as Internet of Things, Cloud computing, semantic Web, virtualisation and service-oriented technologies) with advanced manufacturing models, information and communication technologies. It aims to be networked, intelligent, service-oriented, knowledge-based and energy efficient, and promises a variety of benefits and advantages by providing fast, reliable and secure on-demand services for users. It is envisioned that companies in all sectors of manufacturing will be able to package their resources and know-hows in the Cloud, making them conveniently available for others through pay-as-you-go, which is also timely and economically attractive. Resources, e.g. manufacturing software tools, applications, knowledge and fabrication capabilities, will then be made accessible to presumptive consumers on a worldwide basis. After surveying a vast array of available publications, this paper presents an up-to-date literature review together with future trends and research directions in Cloud manufacturing.
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| 17. |
- Addelyan Rasi, Hamideh, et al.
(författare)
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Can a psychosocial intervention programme teaching coping strategies improve the quality of life of Iranian women? : A non-randomised quasi-experimental study
- 2013
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Ingår i: BMJ Open. - : BMJ Publishing Group. - 2044-6055. ; 3:3
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Tidskriftsartikel (refereegranskat)abstract
- Objectives: To assess whether a psychosocial intervention teaching coping strategies to women can improve quality of life (QOL) in groups of Iranian women exposed to social pressures. Design: Quasi-experimental non-randomised group design involving two categories of Iranian women, each category represented by non-equivalent intervention and comparison groups. Setting: A large urban area in Iran. Participants: 44 women; 25 single mothers and 19 newly married women. Interventions: Seventh-month psychosocial intervention aimed at providing coping strategies. Primary outcome measures: Effect sizes in four specific health-related domains and two overall perceptions of QOL and health measured by the WHOQOL-BREF instrument. Results: Large effect sizes were observed among the women exposed to the intervention in the WHOQOLBREF subdomains measuring physical health (r=0.68; p<0.001), psychological health (r=0.72; p<0.001), social relationships (r=0.52; p<0.01), environmental health (r=0.55; p<0.01) and in the overall perception of QOL (r=0.72; p<0.001); the effect size regarding overall perception of health was between small and medium (r=0.20; not significant). Small and not statistically significant effect sizes were observed in the women provided with traditional social welfare services. Conclusions: Teaching coping strategies can improve the QOL of women in societies where gender discrimination is prevalent. The findings require reproduction in studies with a more rigorous design before the intervention model can be recommended for widespread distribution.
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| 18. |
- Adell, Johan, 1980, et al.
(författare)
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Thermal diffusion of Mn through GaAs overlayers on (Ga, Mn)As
- 2011
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Ingår i: Journal of Physics. - : Institute of Physics Publishing (IOPP). - 0953-8984 .- 1361-648X. ; 23:8
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Tidskriftsartikel (refereegranskat)abstract
- Thermally stimulated diffusion of Mn through thin layers of GaAs has been studied by x-ray photoemission. (Ga, Mn)As samples with 5 at% Mn were capped with 4, 6 and 8 monolayer (ML) GaAs, and Mn diffusing through the GaAs was trapped on the surface by means of amorphous As. It was found that the out-diffusion is completely suppressed for an 8 ML thick GaAs film. The short diffusion length is attributed to an electrostatic barrier formed at the (Ga, Mn)As/GaAs interface.
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| 19. |
- Adisa, Femi, et al.
(författare)
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The mediating role of absorptive capacity in knowledge transfer : ERP implementations in small and medium sized enterprises in sub-Saharan Africa
- 2013
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Ingår i: International Journal of Enterprise Information Systems. - : IGI Global. - 1548-1115 .- 1548-1123. ; 9:2, s. 1-19
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Tidskriftsartikel (refereegranskat)abstract
- Knowledge transfer between consultants and organizational users influences the outcomes of an Enterprise Resource System (ERP) implementation. Configuration and implementation tasks are dependent on generating some level of shared understanding of both business practices and technology. These problems become acute in implementations in small and medium sized enterprises (SMEs). SMEs often operate with non-standard business processes, making an effective interchange of process knowledge between consultants and end-users crucial. Using a multiple case study method and content analysis, the authors investigate the mediating role of absorptive capacity in knowledge transfer in SMEs ERP implementations. They present exploratory case studies from 3 Nigerian companies with varying outcomes, and hypothesize that knowledge transfer is complicated by acute information asymmetry, absence of pre-existing related knowledge and consequent difficulties in developing a shared understanding, and by a tendency to operate with lone consultants and lone organizational representatives.
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| 20. |
- Adolfsson, Annsofie
(författare)
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Applying Heidegger's interpretive phenomenology to women's miscarriage experience
- 2010
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Ingår i: Psychology Research and Behavior Management. - : Dove Medical Press Ltd.. - 1179-1578. ; 2010:3, s. 75-79
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Tidskriftsartikel (refereegranskat)abstract
- Much has been written about measuring the feelings and impressions of women regarding their experience of miscarriage. According to the existential philosopher Heidegger life experiences such as the experience of a woman having a miscarriage can be interpreted and explained only in the context of the totality of the women’s experiences in the past, the present, and the future. Thirteen in-depth interviews with women about their experiences of miscarriage were interpreted with respect to Heidegger’s “Being and Time”. By using his inter-pretive phenomenology the essence of the miscarriage experience was explored and defined. The women’s feelings and impressions were influenced by past experiences of miscarriage, pregnancy, and births. Present conditions in the women’s lives contributing to the experience include their relationships, working situation, and living conditions. Each woman’s future prospects and hopes have been structurally altered with regard to their aspirations for their terminated pregnancy. The impact of miscarriage in a woman’s life was found to be more important than caregiver providers and society have previously attributed to in terms of scale. The results of the interviews reveal that the women believed that only women who had experienced their own miscarriages were able to fully understand this complex womanly experience and its effects on the woman who had miscarried.
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