| 1. |
- Bengtsson, Lars, 1963
(author)
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Avancerad Elektrisk Mätteknik
- 1996
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Book (other academic/artistic)abstract
- Boken är avsedd för fortsättnigskurser i elektrisk mätteknik på högskolenivå. Den lämpar sig också väl som kompletteringslitteratur för kurser i signalbehandling. Innehållet är framför allt koncentrerat till analog och digital frekvensanalys, brusreducerande mätmetoder och AD/DA-omvandlingsmetoder. Ett kapitel tar upp signalbehandling och sambanden mellan analys i tid och rum. Fouriertransformen och faltningsintegralen gås igenom i detalj. Boken avslutas dels med ett kapitel om snabba förlopp i transmissionsledningar, dels med ett kapitel om GPIB-bussen. I appendix finns även en beskrivning av RS-232-kommunikation.
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| 2. |
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| 3. |
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| 4. |
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| 5. |
- White Sjölander, Peta, 1961-
(author)
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A study of the effects of vocal intensity variation on children’s voices using long-term average spectrum (LTAS) analysis
- 1998
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In: Logopedics, Phoniatrics, Vocology. - : Informa UK Limited. - 1401-5439 .- 1651-2022. ; 23:3, s. 111-120
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Journal article (peer-reviewed)abstract
- Studies of adult voices have shown that, as vocal intensity is increased, the partials at higher frequencies gain more than those at lower frequencies. Investigations involving children's normal productions are uncommon, however, and there is, consequently, little knowledge of how children's vocal function differs from that of adults. Using LTAS analysis, this study investigates the effects of vocal intensity variation on the voices of 10-year-old schoolchildren singing in soft, mid and loud voice. A frequency-dependent gain factor was calculated which showed the increase in level to have been greater for partials at higher than at lower frequencies for these children. Also, gain within frequency bands was often different between boys and girls, although this was not demonstrated statistically.
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| 6. |
- Munthe, Christian, 1962
(author)
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Pure Selection. The Ethics of Preimplantation Genetic Diagnosis and Choosing Children without Abortion
- 1999
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Book (other academic/artistic)abstract
- Preimplantation ge¬netic diagnosis (PGD) is taken to mark the starting-point of a new phase in human reproduction, where the possibility of choosing children on genetic grounds without having to resort to ethi¬cally controversial procedures (such as abortion) will grad¬ually increase. Ethical and political issues actu¬alised by this develop¬ment are addressed. The discussion touches upon issues regarding the moral status of em¬bryos and gametes, the moral import of respecting individual auton¬omy and its implications for the requirement of informed consent in health-care, the connec¬tion between sickness, dis¬ability and the value of life, the moral status of possible future people, and the connection between choosing children and eugenic policies of the past. Practical policy issues are adressed on the basis of this, as well as an empirical case-study of the intro¬duction of PGD in Sweden. The book ends up in a set of recommendations regarding the management of re¬search on, introduction and routine use of procedures for pure se¬lection, both within health care and from the point of view of society as a whole. It is argued that research on such procedures should be allowed and supported by society. However, tight restrictions regarding the clinical introduction of new procedures in this area is highly desirable. A rough model for implementing such re¬strictions is also pre¬sented. It is further asserted that, although reasons of economy and safety should limit the access to pure se¬lection, society should not apply any explicit restrictions based on ideasregarding how different traits affect a person’s quality of life. It is stressed that, in order to to avoid a re¬sur¬rection of eugenic policies of the past, the development in this field un¬der¬lines the need for continued and strengthen public support to the sick, dis¬abled and mentally retarded.
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| 7. |
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| 8. |
- Bengtsson, Lars, 1963
(author)
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Mikrodatorteknik
- 1995
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Book (other academic/artistic)abstract
- Första delen behandlar Microchips "Base-line"-kretsar och andra delen behandlar "Midrange"-kretsarna. De flesta funktioner belyses med konstruktionsexempel. Exempel och övningar är mycket hårdvarunära och boken behandlar konstruktion av mikrodatorer från grunden. Boken är avsedd för kurser i mikrodatorteknik på högskolan eller annan högre teknisk utbildning, men kan även användas som självstudiematerial eftersom de flesta exempel ges med detaljerade och verifierade lösningar av såväl hård- som mjukvaran. Tidigare erfarenhet av assemblerprogrammering är inte nödvändig men grundläggande kunskaper i digitalteknik förutsätts. Boken kan med fördel också läsas av rutinerade assemblerprogrammerare som vill veta hur prestanda hos de nya RISC-baserade PIC-controllerna står sig i konkurrensen med de mer etablerade enchipscontrollerna, t ex HC11 och 8751, som bygger på traditionell CISC-arkitektur.
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| 9. |
- Eriksson, Patric, et al.
(author)
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A role for 'sensor simulation' and 'pre-emptive learning' in computer aided robotics
- 1995
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In: 26th International Symposium on Industrial Robots, Symposium Proceedings. - : Mechanical Engineering Publ.. - 1860580009 ; , s. 135-140
-
Conference paper (peer-reviewed)abstract
- Sensor simulation in Computer Aided Robotics (CAR) can enhance the capabilities of such systems to enable off-line generation of programmes for sensor driven robots. However, such sensor simulation is not commonly supported in current computer aided robotic environments. A generic sensor object model for the simulation of sensors in graphical environments is described in this paper. Such a model can be used to simulate a variety of sensors, for example photoelectric, proximity and ultrasonic sensors. Tests results presented here show that this generic sensor model can be customised to emulate the characteristics of the real sensors. The preliminary findings from the first off-line trained mobile robot are presented. The results indicate that sensor simulation within CARs can be used to train robots to adapt to changing environments.
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| 10. |
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| 11. |
- van der Wijngaart, Wouter, et al.
(author)
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Valve-less diffuser fluid micropump
- 1999
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In: Gordon Research Conference 1999, Analytical Chemistry, New Hampshire, USA.
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Conference paper (peer-reviewed)
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| 12. |
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| 13. |
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| 14. |
- Engström, Tomas, 1950, et al.
(author)
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Alternatives to Line Assembly: Some Swedish examples
- 1996
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In: International Journal of Industrial Ergonomics. - 1872-8219 .- 0169-8141. ; 17:3, s. 235-245
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Journal article (peer-reviewed)abstract
- In recent years, some criticism of Lean production has occurred, focusing among other things on the working conditions and the susceptibility of traditional assembly work in a society upgrading the demands for a more humanized work. Recently, this criticism has also concerned the technical aspects of this type of manufacturing. Because of this, alternatives to line assembly merit some attention. Experiences from some innovative production systems operated in the Swedish automotive industry during the last two decades are of particular interest. These unconventional production systems feature autonomous work groups and extended work cycles. These types of production systems are elucidated in detail by means of e.g nuance the concept of utilising buffers, i.e. there are different types of buffers (or buffer functions) as is classified (or clarified) in this publications.
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| 15. |
- Engström, Tomas, 1950
(author)
-
Avrapportering av projekt ”Dokumentation av Volvo Personvagnars slutmonteringsfabrik i Uddevalla”
- 1995
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Reports (other academic/artistic)abstract
- This publication reports on some of a research foundation's (Arbetsmiljöfonden) financed parts of Engström’s and his colleagues' (researchers a well as other individuals) participation in the design, development, starting-up and full-scale production phases of the Volvo Automobile assembly plant in Uddevalla. This particular initiative (for the publication now treated here) resulted on in the fact that all of the documents from this assembly plant was collected (thereafter sorted on site in order to eliminate redundancies), and finally were each and every binder of documents etc. sent to the basement at of Engström’s final experimental workshop located at Chalmers University of Technology (such workshops are nowadays utopian, see below). There these documents were harboured at this premise for several years until totally new building facilities were provided for a number of different departments. At this moment were rents accelerated (bewildering costs was claimed on individual scientists) (an experimental workshop proved to be utopian). Engström’s research group was therefore forced to let this documentation to be sent to external store rented outside of Chalmers. Moreover, this documentation included (in a similar manner but much better prepared from our side), all of the documents from the Volvo Kalmar assembly plant which was closed approximately a year after the Volvo Uddevalla assembly plant (see some of the other publications registered in Chalmers Public Library CPL). Later on (more than approximately two decades), was this totally unique documentation transferred to Volvo’s Historical Archive (organised under the Volvo Museum) who in all respects mistreated this material and also unfortunately neglected a written agreement (contract) with Chalmers and Engström. In fact, it was by no means a professional treatment of the material in question. In fact, they gradually proved to neglect it. as a part of a protracted process, i.e. this Volvo organisation dragged for years to do anything at all with it (they changed manager and proved to not be able to deal with these two documentations in any professional manner, among other things due to lack of space and must probably for other reasons as well). On the other hand, interest and help from Chalmers side were almost non-existing, at the very end of Engström’s employment were some rather lame efforts to carried out. Individuals at Chalmers were afraid to create conflicts Volvo by asserting the contract due to ongoing financing and the fact that Engström had to retire anyway. Consequently, were no help available from Chalmers side to claim the agreement with the previous manager of Volvo Museum etc. As a result, this material from the two unique/pioneering assembly plants was forever lost to the scientist, or lest severely mutilated (see comment below) (sadly, we never got time to gain any academic merits of this material, it just cost money drawn from Engström's donation granted from Volvo Uddevalla assembly plant). And believe the author here, it was an enormous (almost frightening) amount of binders, books etc. each of them scrupulous registered by Engström and his research colleagues as well as by local Volvo personnel that also kindly helped us out. Note, two written agreement with the top manager of each of these two assembly plants were both predating the contract with the Volvo archive by decades. Among other things, the material was partly used once again by local Volvo personnel than the Autonova plant later was constructed, i.e. some years after the closing down, i.e. the rebirth of the Volvo Uddevalla plant. However, to be frank, here, some of the material was just thrown in pallets at the very end, due to time restraints during our documentation processes. But generally speaking, were most of the material fully organised and saved in bookshelves at the basement of our final experimental workshop at Chalmers (and each binder etc, was assigned a sequence number that corresponded to our register sequence number, denotation, finding-place etc. (in accordance with the written agreements with the two top managers). It was in many respects a bewildering work carried out during several years (e.g. it was not easy for us to figure out exactly how) besides during the period of closing down were not Volvo personnel keen to let the central Volvo organisation get hold of anything (no other would probably have managed to carry through such documentation for a number of different reasons). A comment and important: The documentation work from our side was organised in accordance with the process and organisation of each of the two assembly plants. Thus, was it not following the Swedish Archive Standard usually supported by rather unmanageable PC-based systems (which Volvo’s Historical Archive practised). This archive standard would, in fact, have fragmented et the two documentations, and thereby not enhanced a deeper understanding of each assembly plant (such standards are used for saving of single/individual documents or series thereof) (interrelation between binders and documents are thereby entirely lost). This fact was clear to us and also considered by the earlier manager at the Volvo archive and thus dealt with in the agreement between Chalmers and the historical archive. Among other things was Engström from the beginning supposed to help Volvo out by means of packing up the material. However, this was not considered by the new manager (who, as said before, neglected the registering and work carried out by Engström's research group).
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| 16. |
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| 17. |
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| 18. |
- Engström, Tomas, 1950, et al.
(author)
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Developments in Assembly System Design: The Volvo Experience
- 1999
-
In: Coping with Variety: Flexible Production Systems for Product Variety in the Automobile Industry; Lung, Y., Chanaron, J. J., Fujimoto, T. and Raff, D. (eds.); Ashgate, Aldershot. - : Routledge. - 9780429839931 ; , s. 192-223
-
Book chapter (other academic/artistic)abstract
- This chapter focuses on experiences concerning the development of assembly systems within the Volvo Corporation. It provides research and development work within the Swedish automotive industry. The chapter considers a specific trajectory concerning assembly system design in the Swedish automobile industry, generalising the Volvo Kalmar and Volvo Uddevalla experiences. During 1988–1990, the managers at Volvo were planning the manufacturing of the new 800 model at the main Volvo Torslanda plant, as well as looking for a total redesign of the plant. The average product quality in the Uddevalla plant was high–in fact better than in Volvo's line assembly plants–but the product quality varied considerably. Productivity and flexibility proved to be superior to traditional serialassembly systems. Two ways of decreasing the time losses are to introduce parallel flow assembly systems–that is assembly systems consisting of many, short, unpaced flows–or to introduce buffers between work-stations.
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| 19. |
- Engström, Tomas, 1950, et al.
(author)
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Evaluation Methods for Assembly Work and Product Design in Radically Different Production Systems: Results from case studies and action research in Swedish industry
- 1993
-
In: Productivity & Quality Management Frontiers – IV, Proceedings 4th Int. Conference on Productivity & Quality Research, Miami; Suthmanth, D. J., Edosomwan, J. A., Poupart, R. and Sink, D. S. (eds.), Industrial Engineering and Management Press, Norcross, Georgia. ; 2, s. 333 - 342
-
Conference paper (peer-reviewed)
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| 20. |
- Engström, Tomas, 1950, et al.
(author)
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Extended Work Cycle Assembly - A crucial learning experience
- 1994
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In: The International journal of human factors in manufacturing. - : Wiley. - 1045-2699 .- 1522-7111. ; 4:3, s. 293-303
-
Journal article (peer-reviewed)abstract
- This paper reports on a crucial learning experience relating to design principles applied in the Volvo Car Corporation final assembly plant in Uddevalla, Sweden. These principles include the concept of holistic learning, specifically through the creation and transformation of complementary, interrelated physical, semantical, and cognitive structures. We report on the learning environment and learning aids, as well as the learning method applied to the assembly of one-quarter of an automobile performed by one single person. Through the application of this learning concept, it proved possible to dramatically reduce the learning time required for long cycle time assembly work, making cycle times of 2 hours or more a practical proposition for full-scale automotive manufacturing today.
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| 21. |
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| 22. |
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| 23. |
- Engström, Tomas, 1950
(author)
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Förändring av industriell praxis till funktionella förebilder
- 1990
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In: Arbetsliv i utveckling – Om forskarstött förändringsarbete, Arbetsvetenskapliga Kollegiet i Göteborg. Göteborg, sid 25 - 37.
-
Book chapter (other academic/artistic)abstract
- The publication (or this book) was written during a period of time that Arbetsvetenskapliga Kollegiet running in Gothenburg (a research project financed by the Swedish Work Environment Fund in Stockholm (“Arbetsmiljöfonden AMFO” in the Swedish language), which were organized as a joint venture initiative between a number of selected department at Chalmers University of Technology and at Gothenburg University).
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| 24. |
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| 25. |
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| 26. |
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| 27. |
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| 28. |
- Engström, Tomas, 1950, et al.
(author)
-
Material Flow Analysis, Sociotechnology and Natural Grouped Assembly Work for Automobiles and Trucks
- 1990
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In: Research and Development in Work and Technology, Proceedings of a European Workshop, Dortmund, Porsnschlegel, H. (ed.), Physica Verlag, Heidelberg. ; , s. 219 - 242
-
Conference paper (peer-reviewed)
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| 29. |
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| 30. |
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| 31. |
- Engström, Tomas, 1950, et al.
(author)
-
Some Findings from Learning of Assembly Work in Sweden
- 1992
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Conference paper (other academic/artistic)abstract
- This publication is authored together with senior research competency within work organisation (professor Ulf Karlsson) (who rather inofficially functioned as a tutor for Engström during his PhD-studies, this was necessary since a full professor was lacking for several years at the Departement of Transportation) (in fact we both cooperated for a number of decades) (see some of the other publications registered Chalmer Public Library CPL).
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| 32. |
- Engström, Tomas, 1950, et al.
(author)
-
Successive Assembly System Design Based on disassembly of Products
- 1997
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Conference paper (other academic/artistic)abstract
- This publication explains in one particular perspective how the authors dealt with s the product architecture and product variation of the automotive products disassembled (which by the way, proved to necessary to be carried out in one of the experimental workshops). Specifically, it treats our self-developed method to design (real-life) assembly systems and well as a particular way how to analyse information systems. We are reporting of how the product data harboured in this information system are practically prospected and also how the findings, which thereby gradually are emanating, are amalgamated (cross-referred) with completed and disassembled products. That is, a successive assembly system designs by means of disassembly of products (however, if more socio-technically advanced designs are sought for this calls for a reconfiguration of the information) (see some of the other publications registered in Chalmers Public Library CPL).
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| 33. |
- Engström, Tomas, 1950, et al.
(author)
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The Volvo Uddevalla Plant and Interpretations of Industrial Design Processes
- 1998
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In: Integrated Manufacturing Systems. ; 9:5, s. 279 - 295
-
Journal article (peer-reviewed)abstract
- This article explains exactly how the design of the Volvo Automobile Company's assembly plant in Uddevalla gradually was forced into the final unorthodox (real-life) assembly system, this due to a number of successive sub-decisions. The logic of the projection process was inescapable leading into practicing of the parallel product flow assembly system design (small parallel workgroups were all of them completing total automobiles (this at an extensively long work cycle times) (the minimum competence required for the operators performing assembly work were 1/4 of an automobile). This was, in fact, a design that was international unique. The Volvo Truck Company's so-called assembly docks located at the Tuve plant in Gothenburg, was the other such sociotechnically advance (real-life) assembly system (i.e. used for completing heavy truck chassis) (two of the tree authors were responsible for both these two (real-life) efforts by means of having an experimental workshop outside Chalmers University of Technology for nine years – though naturally with extensive help and active support from both these two companies, as well as by research funds (i.e. The Swedish Work Environment Fund and later on also by The Swedish Transport and Communication Research Board, i.e. at Chalmers than this shop was closed down) (it ought to be mentioned that this article has got an academic distinction from the journal for being the year’s most interesting article).
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| 34. |
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| 35. |
- Lassinantti, Lars, et al.
(author)
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Trainees as change agents in SMEs : experiences from a program for the development of smaller enterprises
- 1998
-
Reports (other academic/artistic)abstract
- In Sweden, as in most industrialized countries, technology transfer programs and other initiatives aiming at facilitating for smaller firms to utilize the specific expertise universities possess have been common. One example is trainee programs introducing workforce and specialists trained by universities to SMEs. The first Swedish university trainee program directed towards smaller firms started at Luleå University of Technology, and has been running for almost two decades. In this paper we, building on in-depth case studies of two smaller firms supplemented by data from a larger data base, analyze and discuss some experiences from this program, and especially address typical situations where trainees serve different purposes in the development of SMEs.
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| 36. |
- Nilsson, Anders, et al.
(author)
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Business ethics and systems thinking
- 1997
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In: Systems Practice. - 0894-9859. ; 10:4, s. 491-505
-
Journal article (peer-reviewed)abstract
- This paper discusses the development of research in business ethics and recent directions taken by scholars in the field. We also analyze ethical considerations in systems theory and speculate on the possibilities of examining business ethics from a systemic perspective.
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| 37. |
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| 38. |
- Westerberg, Mats, et al.
(author)
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Does the CEO matter? An empirical study of small Swedish firms operating in turbulent environments
- 1997
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In: Scandinavian Journal of Management. - 0956-5221 .- 1873-3387. ; 13:3, s. 251-270
-
Journal article (peer-reviewed)abstract
- This paper develops and tests a framework for understanding the performance of small firms operating in highly turbulent environments. Performance is conceptualized as being multidimensional, taking into account both financial and market performance. The purpose was to delineate the importance of CEO characteristics (self-efficacy, tolerance for ambiguity and need for cognition) in relation to some aspects of firm orientation (Market vs. Internal and Planning vs. Implementation). The results showed that CEO characteristics tended to have a considerable impact on firm performance and on firm orientation, while no significant relationship between firm orientation and firm performance was found.
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| 39. |
- Westerberg, Mats
(author)
-
Managing in turbulence : an empirical study of small firms operating in a turbulent environment
- 1998
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Doctoral thesis (other academic/artistic)abstract
- This thesis deals with how small firms, and especially their CEOs, manage their situation in times of high environmental turbulence. Eight firms have been chosen for the empirical study based on their performance and the CEO’s self-efficacy and tolerance for ambiguity. Interviews with the CEO and employees at each firm, observations, gathering of annual reports and a questionnaire are the principal means used for data collection. The results show that the CEO is very influential at all firms, regardless how the company performs. A CEO that tolerate uncertainty is better able to engage in enterprising, which seems necessary in turbulence. A CEO with high self- efficacy is generally able to control his firms destiny by having access to the appropriate resources for the task (e.g. own ability and network). However, too high self-efficacy could be a sign of dysfunctional overconfidence, where the CEO dismiss relevant information from actors around him.
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| 40. |
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| 41. |
- Ylinenpää, Håkan, et al.
(author)
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Academia facing small business reality : a study from the perspective of university trainees
- 1999
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Reports (other academic/artistic)abstract
- Promoting the development of small and medium-sized enterprises (SMEs) by means of different programs for knowledge and technology transfer from universities is common in most countries. In this paper we, building on two decades of experience from a university trainee program for smaller firms, address two questions: (1) How do SME-Trainees taking part in a specific program in Sweden perceive the value of their trainee period, and (2) how do trainees, utilising a specific list of variables, characterise their host firms. In focus are differences relating to firm size. The results indicate that trainees in micro firms are more satisfied with their trainee period than trainees in larger SMEs, which - considering that the trainees characterised these micro firms as less developed - was somewhat surprising. Utilising former trainees as initiated respondents this paper also suggests that a cut-point represented by five employees in a significant way distinguish smaller and larger SMEs.
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| 42. |
- Baumann, Henrikke, 1964, et al.
(author)
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Det specifika med miljösystemanalysen
- 1999
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Other publication (other academic/artistic)abstract
- Sammanfattning av diskussion om vad forskning i ämnet miljösystemanalys innebär och innefattar.
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| 43. |
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| 44. |
- Wik, Torsten, 1968, et al.
(author)
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Transfer functions for series of continuously stirred biofilm reactors
- 1997
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Reports (other academic/artistic)abstract
- There is an increasing interest in modeling and applications of biofilm reactors. Commonly, biofilm reactors are modeled as a single continuously stirred biofilm reactor (CSBR), or as a series of such. The models can be used to extract information about the reactor, for design and to predict reactor effluent characteristics as a function of influent characteristics. A CSBR consists of a stirred tank, which the bulk water flows through, and from which substrates diffuse into a biofilm where they may be transformed into new substances by bacteria living in the biofilm. Here, standard assumptions are used to derive a general and flexible dynamic model of CSBR-systems, where the reaction kinetics are of zero or first order. An exact, and an approximate transfer function, which enables easy simulations, analysis, and implementation in real-time softwares, is derived. Particular focus is on pulse responses, which is an important experimental procedure in control and reactor design. Explicit equations for the pulse responses are presented, and parameter dependancy is discussed. Experimental data from a pilot plant nitrifying trickling filter are used to illustrate the use of transfer functions for identification of reactor and biofilm parameters.
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| 45. |
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| 46. |
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| 47. |
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| 48. |
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| 49. |
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| 50. |
- Berbyuk, Viktor, 1953
(author)
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Dynamics and optimal control of biotechnical systems "Man-Prosthesis"
- 1997
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In: IUTAM Symposium on Interaction Between Dynamics and Control in Advanced Mechanical Systems, Ed. D. van Campen, Kluwer Academic Publishers, 1997. - Dordrecht : Springer Netherlands. ; , s. 35-42
-
Conference paper (peer-reviewed)abstract
- In the paper, a mathematical model is proposed for investigating the controlled motion of human locomotion system (HLS) with an above-knee prosthesis. To provide insight into the interaction between dynamics and control in biotechnical system Man-Prosthesis the energy optimal control problem of the HLS wearing a lower limb prosthesis has been considered. The algorithm is based on special conversion of the optimal control problem for a nonlinear dynamical system which models HLS into a standard nonlinear programming problem. A number of energy-optimal control problems of human locomotion with an artificial leg, and optimization problems for the constructive parameters of the prostheses under different boundary conditions and constraints have been solved. The numerical results obtained were compared with experimental data for normal human locomotion. The energy-optimal elastic and viscoelastic characteristics of the ankle and knee joints of the prostheses have been determined.
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