| 1. |
- Dencker, Kerstin, 1972-, et al.
(author)
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Characteristic of a proactive assembly system
- 2008
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In: MANUFACTURING SYSTEMS AND TECHNOLOGIES FOR THE NEW FRONTIER. - NEW YORK : SPRINGER. - 9781848002661 - 9781848002678 ; , s. 123-128
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Conference paper (peer-reviewed)abstract
- Competitive assembly systems must cope with frequent demand changes, requiring drastically shortened resetting and ramp-up times. Characteristics of assembly systems capable of rapid change are e.g. Flexibility; Robustness, Agility, and ability to handle frequent changes and disturbances. This paper proposes proactivity as a vital factor of semi-automated assembly systems to increase speed of change. Proactive systems utilize the full potential of human operators and technical systems. Such systems have ability to dynamically change system automation levels, resulting in decrease of time consumed for assembly tasks. Proactivity criteria for assembly systems are reviewed based on theory and industrial case studies
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| 2. |
- Brånemark, Per-Ingvar, et al.
(author)
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Zygoma fixture in the management of advanced atrophy of the maxilla: technique and long-term results.
- 2004
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In: Scandinavian journal of plastic and reconstructive surgery and hand surgery / Nordisk plastikkirurgisk forening [and] Nordisk klubb for handkirurgi. - : Informa UK Limited. - 0284-4311. ; 38:2, s. 70-85
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Journal article (peer-reviewed)abstract
- Despite refinements in surgical technique, including bone grafting and sophisticated prosthetic reconstructions, there are limitations to what can be achieved with bone-anchored fixed prostheses in patients with advanced atrophy of the maxillae. A new approach was suggested by a long-term study on onlay bone grafting and simultaneous placement of a fixture based on a new design: the zygoma fixture, and the aim of this study was to assess its potential. Twenty-eight consecutive patients with severely resorbed edentulous maxillae were included, 13 of whom had previously had multiple fixture surgery in the jawbone that had failed. A total of 52 zygoma fixtures and 106 conventional fixtures were installed. Bone grafting was deemed necessary in 17 patients. All patients have been followed for at least five years, and nine for up to 10 years. All patients were followed up with clinical and radiographic examinations, and in some cases rhinoscopy and sinoscopy as well. Three zygoma fixtures failed; two at the time of connection of the abutment and the third after six years. Of the conventional fixtures placed at the time of the zygoma fixture, 29 (27%) were lost. The overall prosthetic rehabilitation rate was 96% after at least five years of function. There were no signs of inflammatory reaction in the surrounding antral mucosa. Four patients with recurrent sinusitis recovered after inferior meatal antrostomy. To conclude, the zygoma fixture seems to be a valuable addition to our repertoire in the management of the compromised maxilla.
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| 3. |
- Dencker, Kerstin, 1972-, et al.
(author)
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An approach to proactive assembly systems - Towards competitive assembly systems
- 2007
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In: 2007 IEEE International Symposium on Assembly and Manufacturing. - NEW YORK : IEEE. - 9781424405626 ; , s. 294-299
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Conference paper (peer-reviewed)abstract
- Manufacturing competitiveness is highly dependant on companies' ability to rapidly reconfigure their manufacturing and assembly systems. Efforts to approach emerging and self-reconfigurable systems could be successfully complemented by efficient integration of highly flexible human operators into the system. The concept of system proactivity is introduced which is based on the interrelated levels of automation, information, and competence in the assembly system. An ongoing project to develop proactive assembly systems, ProAct, is described.
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| 4. |
- Dencker, Kerstin, et al.
(author)
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Proactive Assembly System : High productive assembly systems supported by skillful operators and appropriate automation
- 2007
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Conference paper (other academic/artistic)abstract
- Manufacturing competitiveness is highly dependant on the companies’ability to rapidly reconfigure their assembly systems. Ongoing efforts to approachself-reconfiguring and “emerging” assembly systems are promising but can besuccessfully complemented by integration of highly flexible human operators intosuch system models. This paper introduces the concept of assembly systemproactivity. The approach is based on interrelated levels of human involvement,automation, and information handling within the assembly system. Presently,assembly system developers react to the companies’ demands, thus developingsolutions, which are direct responses to existing problems, i.e. a highlyreactive approach. Assembly systems need to be more dynamic and evolvable tokeep up with the reduced product life cycles and still be cost efficient. Consequently,assembly systems with the ability to proactively meet emergent and long-termfluctuations concerning product design and volume capacity are required. Suchsystems consist of technical components efficiently integrated with human operatorsto constitute reliable resources in the production system. That way, disturbances canbe minimized and the availability of the entire production system increased.
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| 5. |
- Dencker, Kerstin, et al.
(author)
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Proactive Assembly Systems : Realizing the Potential of Human Collaboration with Automation
- 2007
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In: IFAC-CEA.
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Conference paper (peer-reviewed)abstract
- Manufacturing competitiveness highly depends on companies' ability to rapidly reconfigure their assembly systems. This paper introduces the concept of assembly system proactivity based on interrelated levels of human involvement in a planed way will contribute to increased system ability to proactively address predicted and unpredicted events. Correct involvement of human operators will utilize the full combined potential of human and technical capabilities, also providing cost-efficient assembly system solutions. The ProAct (project presented) will develop proactive assembly system models, evaluating proactive, feature-based solutions. Focus is on realizing the potential of semi-automated system with relevant human involvement, i.e. operators with high skills adding e.g. flexible capability and functionality.
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| 6. |
- Dencker, Kerstin, et al.
(author)
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Proactive assembly systems-realizing the potential of human collaboration with automation
- 2007
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In: Cost Effective Automation. - : International Federation of Automatic Control. - 9783902661326 ; , s. 79-84
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Conference paper (peer-reviewed)abstract
- Manufacturing competitiveness relies on the companies' ability to rapidly reconfigure their assembly systems. This paper introduces assembly system proactivity, a concept based on interrelated levels of human involvement, automation, and information handling. Increased and structured human involvement contributes to increased system ability to proactively address predicted and unpredicted events. Correct involvement of human operators will utilize the fully combined potential of human and technical capabilities, providing cost-efficient assembly system solutions. The ProAct project is developing proactive assembly system models and evaluating proactive, feature-based solutions. Focus is on realizing the potential of cost-efficient and semi-automated systems with relevant human involvement, i.e. highly skilled operators that add flexibility and functionality.
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| 7. |
- Eriksson, Stefan
(author)
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Visual replenishment methods in the manufacturing industry and suggestion for a decision tool
- 2013
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Licentiate thesis (other academic/artistic)abstract
- In almost all supply chains, materials need to be stored or buffered, implying that manufacturing companies need effective replenishment methods. However, this is challenging, since companies must balance inventory costs and customer service in complex and different situations. Therefore, it is important to choose replenishment methods carefully. One well-known and widespread method is Material Requirements Planning (MRP). But the method has problems, such as regarding volume flexibility. There are other methods, but the literature lacks case studies and detailed descriptions and analysis of them, especially for visually oriented methods. Therefore, it is important to explore different methods for materials supply.The purpose of this study is to analyze the application of visually oriented replenishment methods in manufacturing industry and further to design a tentative decision tool for selecting methods. The research aims to provide some answers to three key questions.The first research question concerns general factors that are important for evaluating how effective replenishment methods are. From the literature review, different factors emerged such as product characteristics (fit in the Kraljic matrix, volume issues, size, etc.); information, trust, and geographical proximity between supplier and customer; and different logistics goals (delivery service elements, tied-up capital, use of resources, inventory accuracy). It is also import to include the basic principles methods are related to. The factors were summarized in an analysis model, which is structured with three main areas (planning environment/conditions, basic principles, and effects). The model is used to analyze four case studies.The second research question focuses on the characteristics for visually orientedreplenishment methods. Examples of characteristics are: easy to understand and operate, offers uncomplicated flows, substantially applicable for noncritical and leverage parts with high yearly requirement and fairly even consumption, provides potential for reduced errors in stores/flows, potential for providing high delivery service and low levels of tied-up capital and resource utilization.The third research question focuses on what a tentative decision tool for selecting replenishment methods might look like, based on the factors that emerged from the other research questions and studies by others. In order to achieve an efficient materials supply, companies need to consider these factors when selecting replenishment methods. The decision tool consists of different steps, considering aspects of the planning environment/conditions in relation to the product and the supplier. The importance of the companies’ goals/motives for materials supply must also be assessed. The output from the decision tool is appropriate replenishment methods.
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| 8. |
- Gjengset, Gunnar Hauk, 1946-
(author)
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Matti Aikio - verk og virke
- 2011
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Doctoral thesis (other academic/artistic)abstract
- Denne avhandlingen studerer de litterære verkene til den samiske forfatteren Matti Aikio, samt det nedslag hans verk hadde i samtidens Norge. Aikios romaner, artikler, skuespill og billedkunst ble skapt i tidsrommet 1904-29, en periode da Norge som ny selvstendig nasjonalstat hadde begrenset toleranse med sin samiske minoritet. En slik etnisk kultur-forståelse var i samsvar med samtidens rådende sosial-darwinisme, på overgangen fra kolonialisme til imperialisme. I slike omgivelser fremsto Matti Aikio som norsk forfatter med bøker skrevet på norsk – men med et selvvalgt samisk-lydende kunstnernavn. Det er avhandlingens mål å avdekke en mulig notsetningen mellom storsamfunnets forventning om assimilasjon og Aikios diskrete presentasjon av samiske verdier i sitt verk og virke. Det blir diskutert om nettopp valg av virkemidler førte til mistenkeliggjøring fra samtidens samiske talsmenn, men at ettertiden har vist at Aikios insistering på samarbeidslinje ville gi bedre langsiktige resultater for samisk språk og kultur. Samtidig søker analysen å underbygge at Aikio selv fikk en økt forståelse for den samiske kulturens mangfold i løpet av sin karriere – samtidig som taktikken endret seg i forfatterens langsiktige strategi om full likestilling for den samiske minoriteten. Fra å hevde at den ekte samiske kulturen bare fantes i Karasjok, endte han med en mer moderne og inkluderende forståelse av en samisk folkegruppe med et mangfold av språk og kulturuttrykk.
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| 9. |
- Grünberg, Thomas, 1970-
(author)
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Performance Improvement : a method to support performance improvement in industrial operations
- 2007
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Doctoral thesis (other academic/artistic)abstract
- The objective of this research was to: Develop and evaluate a method which supports performance improvement in industrial operations. This has been done through several case studies and literature research. The result is a scientifically evaluated Performance Improvement Method. All companies strive for better performance, since a high performance level means greater competitiveness, which in turn generates more money. However, there are an extensive number of change and improvement methods described in many different research fields. Moreover, a number of issues, which are linked to these Performance Improvement Methods have been identified. The issues were summarised as criteria, which were posed on both existing improvement methods and the newly developed method, for evaluation and development purposes. The most important issues with Performance Improvement were found to be that most methods were specialist dependent and did not have competence support. Efforts to improve performance in manufacturing operations have been important since the start of the industrialisation era. Some of the first well-known and well-documented practitioners in the area of PI were Taylor and Ford; so there have been many attempts to work with Performance Improvement. A definition of performance, profitability and productivity is presented to show how they can support improvement work. Performance measurement is important to form a basis of facts to link Performance Improvement on. Furthermore, two models, a performance factor model and a performance measurement model, have been developed for use with Performance Improvement. An evaluation of commonly used improvement methods such as Lean Production, Just in Time, Total Productive Maintenance, Six Sigma, Theory of Constraints and Business Process Reengineering, shows both strengths and weaknesses, which were used in the development of the new Improvement Method. Furthermore, a number of case studies were performed to give empirical input to the Performance Improvement Method for practical use. With these practical and theoretical considerations, a formalisation of the Performance Improvement Method was carried out. The Performance Improvement Method has been evaluated through 4 full-scale case studies. The case studies showed that the new Performance Improvement Method has higher criteria support than the other improvement methods evaluated in this research.
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| 10. |
- Gröndahl, Peter, et al.
(author)
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Standardised flexible automatic assembly - evaluating the Mark IV approach
- 2000
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In: Assembly Automation. - : Emerald. - 0144-5154 .- 1758-4078. ; 20:3, s. 217-224
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Journal article (peer-reviewed)abstract
- The Assembly Systems Unit at the Royal Institute of Technology and IVF Stockholm has developed several Flexible Automatic Assembly (FAA) cell solutions over the years (Mark I. Mark II, Mark IIF and Mark III). The industrial reality, however, clearly points out that the basic notions of flexibility must be extended and be enhanced without increasing the complexity. This has led our research team to revise the ideas and solutions available for manual and automatic assembly, resulting in the Hyper Flexible Automatic Assembly (HFAA) project. The paper describes the driving factors behind the needs and objectives for the HFAA project, as well as how it will present a standardised set of assembly process-oriented system components. The paper also describes the new Mark IV application. This industrial HFAA system is being developed in order to test the concept's industrial viability. The HFAA concept will allow the user to start from a manual assembly station and gradually add assembly equipment. The basic concepts of stepwise automation, standard assembly machine and sub-batch principle emanate from our previous research.
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