| 1. |
- Aidas, Kestutis, et al.
(författare)
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The Dalton quantum chemistry program system
- 2014
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Ingår i: WIREs Computational Molecular Science. - : Wiley. - 1759-0876 .- 1759-0884. ; 4:3, s. 269-284
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Tidskriftsartikel (refereegranskat)abstract
- Dalton is a powerful general-purpose program system for the study of molecular electronic structure at the Hartree-Fock, Kohn-Sham, multiconfigurational self-consistent-field, MOller-Plesset, configuration-interaction, and coupled-cluster levels of theory. Apart from the total energy, a wide variety of molecular properties may be calculated using these electronic-structure models. Molecular gradients and Hessians are available for geometry optimizations, molecular dynamics, and vibrational studies, whereas magnetic resonance and optical activity can be studied in a gauge-origin-invariant manner. Frequency-dependent molecular properties can be calculated using linear, quadratic, and cubic response theory. A large number of singlet and triplet perturbation operators are available for the study of one-, two-, and three-photon processes. Environmental effects may be included using various dielectric-medium and quantum-mechanics/molecular-mechanics models. Large molecules may be studied using linear-scaling and massively parallel algorithms. Dalton is distributed at no cost from for a number of UNIX platforms.
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| 2. |
- Anniko, Matti, et al.
(författare)
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Örat
- 2001. - 2
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Ingår i: Öron, näs- och halssjukdomar, huvud- och halskirurgi. - Stockholm : Liber. - 9147048956 ; , s. 9-103
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 3. |
- Bagger-Sjöbäck, Dan, et al.
(författare)
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Örat
- 2006. - 3
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Ingår i: Öron, näs- och halssjukdomar, huvud- och halskirurgi. - Stockholm : Liber. - 9147053100 ; , s. 9-97
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 4. |
- Berg, Jan, et al.
(författare)
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Perceived audio quality of realistic FM and DAB+ radio broadcasting systems
- 2013
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Ingår i: Journal of The Audio Engineering Society. - 1549-4950. ; 61:10, s. 755-777
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Tidskriftsartikel (refereegranskat)abstract
- The perceived audio quality of a digital broadcasting system such as DAB+ is dependent on what type of coding and bit rates are applied. Due to bandwidth constraints, audio quality is prone to be in conflict with other service demands such as the number of channels and the transfer of ancillary data. Compared to DAB+, several other audio services have superior bit rates that challenge the audio quality of DAB+. This paper reviews audio-quality criteria and investigates how the perceived audio quality of different broadcasting systems complies with the criteria. Two studies were conducted: Test 1 where DAB+ codecs were tested at bit rates between 96 and 192 kbit/s and Test 2 where DAB+ systems between 48 and 192 kbit/s as well as FM systems were tested. The systems in Test 2 were designed to as far as possible model a realistic broadcasting signal chain including commonly used dynamic processors. The studies were realized through two listening experiments using the ITU-R recommendations BS.1116 and BS.1534 (MUSHRA) followed by a closing interview. The results showed that the currently highest available subchannel bit rate for DAB+ (192 kbit/s) was insufficient for attaining perceptually transparent quality for critical items, whereas it enabled a quality comparable to or in some instances better than a modern FM system. Extrapolation of data indicates that critical items may need to be coded at even higher bit rates to reach perceptually transparent quality. From the interviews, auditory features important for the subjects’ assessment of quality were observed. This study concludes that when making decisions on broadcasting systems, it is important to have well-founded and clearly defined criteria for minimum acceptable quality and/or perceptually transparent quality.
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| 5. |
- Berg, Thomas, 1975-
(författare)
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Medical Treatment and Grading of Bell's Palsy
- 2009
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The main aim of this thesis was to evaluate the effect of prednisolone and valaciclovir in a large number of Bell's palsy patients. The incidence and intensity of pain around the ear, in the face or in the neck during the first two months of palsy, and its prognostic value, was also assessed. We also investigated how study design and choice of analysis method affect the rate of facial recovery. Furthermore, the agreement between the Sunnybrook, House-Brackmann and Yanagihara facial grading systems was evaluated. From May 2001 to September 2007, a prospective, randomised, double-blind, placebo-controlled, multicentre trial with 12-month follow-up was performed in patients with Bell's palsy. Of 839 randomised patients, 829 were included in the intention-to-treat analysis; 206 received placebo plus placebo, 210 prednisolone plus placebo, 207 valaciclovir plus placebo, and 206 prednisolone plus valaciclovir. Time to recovery was significantly shorter in the 416 patients who received prednisolone compared with the 413 who did not (p<0.0001). At 12 months, 300 of 416 patients (72%) in the prednisolone group had recovered compared with 237 of 413 patients (57%) in the no prednisolone group (p<0.0001). Valaciclovir was not found to affect time to facial recovery or outcome at 12 months. Prednisolone and/or valaciclovir did not affect the incidence or intensity of pain. Presence of pain at day 11 to 17 indicated a worse prognosis for facial recovery at 12 months. We also found that recovery rates in a Bell's palsy trial are substantially affected by the choice of analysis method and definition of facial recovery. We used weighted Kappa statistics in 100 examinations of patients with facial palsy to assess the agreement between the Sunnybrook, House-Brackmann and Yanagihara scales. The highest agreement was found between the regional Sunnybrook and Yanagihara scales. An evaluative difference between the Sunnybrook and House-Brackmann systems was observed.
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| 6. |
- Blomquist, Bo, 1958, et al.
(författare)
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Assembly Systems and Work in the Swedish Automotive Industry
- 2013
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Ingår i: Nordic Lights. Work, Management, and Welfare in Scandinavia. - 1 85972 106 0 ; , s. 225-254
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- See web-link given på Chalmers Public Library (CPL). This is an edited chapter in a book (editor was Åke Sandberg from the Swedish Institute for work Life Research Stockholm (Arbetslivsinstitutet in Swedish). This publication enlightens the authors' research and development work regarding alternatives to line assembly. Comprising e.g. explaining of the different (real-life) assembly systems utilized in Sweden all through the passing years. In a more overarching way, it criticizes the way the insights and experiences gained by such (more or less socio-technically advanced assembly system designs practised (a vast of misunderstandings and rumours are obviously at hand today. To some extent is thereby this actually a refined summarization of some of our earlier scientific contributions (see some of the other publications registered in Chalmers Public Library CPL).
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| 7. |
- Cámara, Fernando, 1967-, et al.
(författare)
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Zinkgruvanite, Ba4Mn2+4Fe3+2(Si2O7)2(SO4)2O2(OH)2, a new ericssonite-group mineral from the Zinkgruvan Zn-Pb-Ag-Cu deposit, Askersund, Örebro County, Sweden.
- 2021
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Ingår i: European journal of mineralogy. - : Nicolaus Copernicus University Press. - 0935-1221 .- 1617-4011. ; 33:6, s. 659-673
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Tidskriftsartikel (refereegranskat)abstract
- Zinkgruvanite, ideally Ba4Mn2+4Fe3+2(Si2O7)2(SO4)2O2(OH)2, is a new member of the ericssonite group, found in Ba-rich drill core samples from a sphalerite+galena- and diopside-rich metatuffite succession from the Zinkgruvan mine, Örebro county, Sweden. Zinkgruvanite is associated with massive baryte, barytocalcite, diopside and minor witherite, cerchiaraite-(Al) and sulfide minerals. It occurs as subhedral to euhedral flattened and elongated crystals up to 4 mm. It is almost black, semi-opaque with a dark brown streak. The luster is vitreous to sub-adamantine on crystal faces, resinous on fractures. The mineral is brittle with an uneven fracture. VHN100 = 539 and HMohs ~4½. In thin fragments, it is reddish-black, translucent and optically biaxial (+), 2Vz > 70°. Pleochroism is strong, deep brown-red (E ⊥ {001} cleavage) to olive-pale brown. Chemical point analyses by WDS-EPMA together with iron valencies determined from Mössbauer spectroscopy, yielded the empirical formula (based on 26 O+OH+F+Cl anions): (Ba4.02Na0.03)Σ4.05(Mn1.79Fe2+1.56Fe3+0.42Mg0.14Ca0.10Ni0.01Zn0.01)Σ4.03 (Fe3+1.74Ti0.20Al0.06)Σ2.00Si4(S1.61Si0.32P0.07)Σ1.99O24(OH1.63Cl0.29F0.08)Σ2.00. The mineral is triclinic, space group P–1, with unit-cell parameters a = 5.3982(1) Å, b = 7.0237(1) Å, c = 14.8108(4) Å, α = 98.256(2)º, β = 93.379(2)º, γ = 89.985(2)º and V = 554.75(2) Å3 for Z = 1. The eight strongest X-ray powder diffraction lines are [d Å (I%; hkl)]: 3.508 (70; 103), 2.980(70; 11–4), 2.814 (68; 1–22), 2.777 (70; 121), 2.699 (714; 200), 2.680 (68; 20–1), 2.125 (100; 124, 204), 2.107 (96; –221). The crystal structure (R1 = 0.0379 for 3204 reflections) is an array of TS (titanium silicate) blocks alternating with intermediate blocks. The TS blocks consist of HOH sheets (H = heteropolyhedral, O = octahedral) parallel to (001). In the O sheet, the Mn2+-dominant MO(1,2,3) sites give ideally Mn2+4 pfu. In the H sheet, the Fe3+-dominant MH sites and AP(1) sites give ideally Fe3+2Ba2 pfu. In the intermediate block, SO4 oxyanions and eleven coordinated Ba atoms give ideally 2 × SO4Ba pfu. Zinkgruvanite is related to ericssonite and ferro-ericssonite in having the same topology and type of linkage of layers in the TS block. Zinkgruvanite is also closely compositionally related to yoshimuraite, Ba4Mn4Ti2(Si2O7)2(PO4)2O2(OH)2, via the coupled heterovalent substitution 2 Ti4+ + 2 (PO4)3- →2 Fe3+ + 2 (SO4)2-, but presents a different type of linkage. The new mineral probably formed during a late stage of regional metamorphism of a Ba-enriched, syngenetic protolith, involving locally generated oxidized fluids of high salinity.
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| 8. |
- Cedheim, Erik, et al.
(författare)
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Kelb - A Real-Time Programming Environment for the Sony Aibo
- 2004
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Kelb is a new real-time programming environment developed at Uppsala University for the Sony AIBO ERS-210. It is aimed to provide efficiency by introducing a notion of light-weight tasks executing according to well-known real-time scheduling algorithms and resource protocols, while still allowing applications to be developed in a high-level abstract programming language. In this paper we give an overview of the design of Kelb and describe the status of the environment, currently including: a real-time programming language and compiler extending gcc for MIPS with support for time- and event-triggered tasks, a runtime library with support for static and dynamic preemptive scheduling algorithms (e.g. fixed priority and earliest deadline first), and a prototype connection to the Times tool allowing Kelb designs to be analysed for schedulabilty.
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| 9. |
- Che, Canyan, et al.
(författare)
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Conducting Polymer Electrocatalysts for Proton-Coupled Electron Transfer Reactions: Toward Organic Fuel Cells with Forest Fuels
- 2018
-
Ingår i: Advanced Sustainable Systems. - : Wiley-Blackwell. - 2366-7486. ; 317
-
Tidskriftsartikel (refereegranskat)abstract
- Lignin is one of the most abundant biopolymers, constituting 25% of plants. The pulp and paper industries extract lignin in their process and today seek new applications for this by-product. Here, it is reported that the aromatic alcohols obtained from lignin depolymerization can be used as fuel in high power density electrical power sources. This study shows that the conducting polymer poly(3,4-ethylenedioxythiophene), fabricated from abundant ele-ments via low temperature synthesis, enables efficient, direct, and reversible chemical-to-electrical energy conversion of aromatic alcohols such as lignin residues in aqueous media. A material operation principle related to the rela-tively high molecular diffusion and ionic conductivity within the conducting polymer matrix, ensuring efficient uptake of protons in the course of proton-coupled electron transfers between organic molecules is proposed.
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| 10. |
- Dahle, Pal, et al.
(författare)
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Accurate quantum-chemical calculations using Gaussian-type geminal and Gaussian-type orbital basis sets : applications to atoms and diatomics
- 2007
-
Ingår i: Physical Chemistry, Chemical Physics - PCCP. - : Royal Society of Chemistry (RSC). - 1463-9076 .- 1463-9084. ; 9:24, s. 3112-3126
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Tidskriftsartikel (refereegranskat)abstract
- We have implemented the use of mixed basis sets of Gaussian one- and two-electron (geminal) functions for the calculation of second-order Moller-Plesset (MP2) correlation energies. In this paper, we describe some aspects of this implementation, including different forms chosen for the pair functions. Computational results are presented for some closed-shell atoms and diatomics. Our calculations indicate that the method presented is capable of yielding highly accurate second-order correlation energies with rather modest Gaussian orbital basis sets, providing an alternative route to highly accurate wave functions. For the neon atom, the hydrogen molecule, and the hydrogen fluoride molecule, our calculations yield the most accurate MP2 energies published so far. A critical comparison is made with established MP2-R12 methods, revealing an erratic behaviour of some of these methods, even in large basis sets.
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| 11. |
- Dastidar, Subham, et al.
(författare)
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Janus cellulose for self-adaptive solar heating and evaporative drying
- 2022
-
Ingår i: Cell Reports Physical Science. - : ELSEVIER. - 2666-3864. ; 3:12
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Tidskriftsartikel (refereegranskat)abstract
- Porous cellulose can be tuned dynamically between reflecting and transparent states through reversible wetting with liquids like water while remaining non-absorptive in both states. By combining porous cellulose with an underlying cellulose-carbon nanotube layer, we here report a Janus cellulose that instead switches between reflect-ing and absorptive states. While the material is reflective and low absorbing in its dry state, exposure to water increases the optical transparency of the top layer and enables the bottom layer to absorb solar light and generate heat. In turn, this initiates a self -adaptive process that drives water evaporation and dries the struc-ture, making it reflective again. In situ measurements of scattering intensity, temperature, and water evaporation reveal an intriguing dynamic relationship between the optical and thermal properties of the Janus cellulose. This study highlights the use of cellulose sys-tems for solar and thermal management, demonstrating solar -induced self-adaptive heating, evaporative drying, and thermal regulation.
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| 12. |
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| 13. |
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| 14. |
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| 15. |
- Ellegård, Kajsa, 1951, et al.
(författare)
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Reflective Production in the Final Assembly of Motor Vehicles - An Emerging Swedish Challenge
- 1992
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Ingår i: International Journal of Operations and Production Management. - 1758-6593 .- 0144-3577. ; 12:7/8, s. 117-133
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Tidskriftsartikel (refereegranskat)abstract
- Presents some theoretical principles and empirical evidence relating to the new Swedish production systems for final assembly of motor vehicles. Contends that in these production systems it is possible simultaneously to enhance efficiency and quality of working life. Briefly sketches three production forms as they apply to the final assembly of automobiles and discusses the societal environments in which these different forms of production have evolved. It focuses on Volvo Uddevalla plant as one of the main examples so far of a reflective production system for final assembly of automobiles. Amplifies the analysis of different production flow patterns for final assembly and in particular addresses the issue of semi‐parallel mechanistic production flow and parallel organic production flow as alternatives to serial flow on a conventional line assembly. A comment: This publication is authored together with e.g. senior research competencies (1) within vocational learning and training as well as (2) within time-geography with whom Engström have had long time cooperation procedures. But also personal at our department/research group (Mats Johansson) well as our knowledgeable contact person (Bertil Johansson) within Volvo contributed (he has really helped us out for decades and was responsible for the continuous contacts with Volvo in most any matter).
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| 16. |
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| 17. |
- Engström, Tomas, 1950, et al.
(författare)
-
Alternativ montering
- 2008
-
Ingår i: Chukyo Keiei Kenkyu (academic japanese journal). ; 18:1, s. 73 - 153
-
Tidskriftsartikel (refereegranskat)abstract
- A translation into Japanese of the three authors’’ book written for and financed by the Swedish Metal Workers Union (IF Metall is Swedish). Namely, “Alternativ montering. Principer och erfarenheter från fordonsindustrin”, Engström, Jonnsson and Medbo 2005). Which was financed by this organization (i.e. Metall), and which summarizes the authors’’ insights and experiences in more popular terms (used for this organization’s education, as well as made available on their website) (see other publications registered in Chalmers Public library CPL).
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| 18. |
- Engström, Tomas, 1950, et al.
(författare)
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Alternativ montering – Principer och erfarenheter från fordonsindustrin
- 2005
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Bok (övrigt vetenskapligt/konstnärligt)abstract
- This book was written for and financed by the Swedish metal workers union (IF Metall is Swedish). And, it summarizes the authors’’ insights and experiences regarding assembly work within the Swedish automotive industry in more popular terms (it was used for this organization’s education, as well as made available on their public website). And, this book features a preface written by the official head (chairman) of the organisation (Göran Johnsson Metall).
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| 19. |
- Engström, Tomas, 1950, et al.
(författare)
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Alternatives to Line Assembly: Some Swedish examples
- 1996
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Ingår i: International Journal of Industrial Ergonomics. - 1872-8219 .- 0169-8141. ; 17:3, s. 235-245
-
Tidskriftsartikel (refereegranskat)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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| 20. |
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| 21. |
- Engström, Tomas, 1950, et al.
(författare)
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An Assembly-Oriented Product Description System as a Precondition for Efficient Manufacturing with Long Cycle Time Work
- 1993
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Ingår i: Productivity & Quality Management Frontiers – IV, Proceedings of the Fourth International Conference on Productivity & Quality Research, Miami, Vol. 2, Suthmanth, D. J., Edosomwan, J. A., Poupart, R. and Sink, D. S. (eds.), Industrial Engineering and Management Press, Norcross, Georgia.
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Konferensbidrag (refereegranskat)
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| 22. |
- Engström, Tomas, 1950, et al.
(författare)
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Assembly Work Structuring Based on Restructuring and Transformation of Product Information
- 2002
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Ingår i: Journal of Humanities and social sciences, Nagoya City University; Nagoya (translated into japanese). - 1342-9310. ; 12, s. 279 - 309
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- This publication partly explains how we had managed amalgamate manufacturing engineering according to our interpretation and e.g. Gestalt psychology (i.e. for the most socio-technically advanced assembly system designs). This is something that is elaborated further and better repetitively in other publications registered in Chalmers Public Library (CPL) (especially is this the case in some of the latest preprints/manuscripts). That is, how the learning and training principles advocated by the senior research competency within vocational learning and training were realised in practice for full-scale production purposes.
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| 23. |
- Engström, Tomas, 1950, et al.
(författare)
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Automotive Industry
- 1997
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Ingår i: The Workplace – Major industries and occupations, Vol. 2, Brune, D., Gerhardsson, G., Crockford, G. W. and Norbäck, D. (eds.), International Occupational Safety and Health Information Centre (CIS), International Labour Office Geneva, Scandinavian Science Publisher, Oslo. ; , s. 548-565
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 24. |
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| 25. |
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| 26. |
- Engström, Tomas, 1950, et al.
(författare)
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Development of Assembly Competence in Parallelized Flow Assembly Systems
- 1994
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- This publication explains the competence development (in form of the length of work cycle times, which were not fixed) within the Volvo Uddevalla plant. Note the minimum work cycle time was 1/4 of an automobile (an inventible result due to the sociotechnically advanced of assembly system design) (in fact, quite ingeniously carried out). The advance material feeding technique was the reason for this competence level (a result of the research and development work within some of the authors' experimental workshops).
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| 27. |
- Engström, Tomas, 1950, et al.
(författare)
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Developments in Assembly System Design: The Volvo Experience
- 1999
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Ingår i: 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
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Bokkapitel (övrigt vetenskapligt/konstnärligt)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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| 28. |
- Engström, Tomas, 1950, et al.
(författare)
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Empirical Evaluation of the Reformed Assembly Work at the Volvo Uddevalla Plant. Psychosocial effects and performance aspects
- 1995
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Ingår i: International Journal of Industrial Ergonomics. - : Elsevier BV. - 1872-8219 .- 0169-8141. ; 16:16, s. 293-308
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Tidskriftsartikel (refereegranskat)abstract
- This paper reports on the innovative, now defunct, Volvo Uddevalla final assembly plant. Theoretical frames of reference, the design process and empirical data on workgroup characteristics and working conditions are focused upon. Information regarding the Uddevalla plant has been gathered during a long-term co-operation project with the Volvo Corporation. During the closing-down period, we obtained full access to all the production engineering data and personnel files available. We also had the opportunity of studying the responses to a questionnaire distributed to a random sample of blue-collar workers. Working conditions in Uddevalla in the form of psychosocial job factors are compared with industrial blue-collar workers in general as well as with assembly workers in the closed down Volvo Kalmar final assembly plant, which had a different, more traditional, production system. The paper also compares the psychosocial job factors, performance measures and work-group characteristics in the five assembly workshops in the Uddevalla plant. In comparing assembly workshops, the paper contrasts two approaches to competence development and work structuring used in Uddevalla, namely (1) giving priority to the individual in-depth training of a specific task or (2) giving priority to a large competence overlap between individuals in a workgroup. Relevance to the industry. This paper reports and explains some results from a multidisciplinary evaluation of shop-floor work in the Volvo Uddevalla plant, a full-scale assembly plant with a parallelized flow and long cycle time, using autonomous work groups. These experiences should be of general interest to industries searching for the factory of the future.
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| 29. |
- Engström, Tomas, 1950, et al.
(författare)
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Engström, T. and Jonsson, D. (2016). Development and Application of (Certain) Principles for Work Structuring
- 2015
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- This manuscript is an extensive book (or preprint not yet finished to due to one the author’s retirement) summaries four decades research and development work dealing with development work of alternatives to assembly lines and assembly line work, as have been the case for one of the two authors from a technical point of departure (he is a senior research competency in mechanical engineering). On the other hand, the other authors have an even longer time perspective, but he has a social science background (he is a senior research competency within sociology for more than four decades). That is, they have been working at Chalmers University of Technology respectively at Gothenburg University all throughout their professional life. This while they both are belonging to a normative sociotechnical research tradition earlier at hand in the Gothenburg area, which actually has emanated from specific precursors at Gothenburg University (i.e. mainly professor Edmund Dalhström at the Department of Sociology), this research tradition was later on brought over to Chalmers by professor Ulf Karlsson responsible for operation management at the same university. It is fair to state that this research area required the amalgamation of technical as well as social science aspects. Efforts that during the passing years have been substantiated by extensive help and support from the Swedish automotive industry (Saab Scania and Volvo companies, as well as other parts of the industry) and also from several governmental research foundations. In fact, a truer cross and multi-science research approach than what usually is at hand has always been required. The extensive book manuscript is exceeding more than 600 pages. Twelve chapters exists as well as also a number of freestanding appendixes and the necessary (all-pervading) definitions of primary concepts and term in combination with explaining various synonyms and homonyms (a particular dilemma for cross and multi-science approaches) (i.e. are we in agreement with the text it alone, or are we eventually together understanding the underlying meaning). Moreover, the text is scrutinized by word process programs in form of Word as well as by the professional English check-up program Grammarly) and all of the necessary figures are completed. i.e. several revisions of this manuscript have been iterated first between the authors and later on against other parties. Most notable are external revisions by two senior research competencies (professor David Bennet responsible for operation management at Aston Business School, Birmingham and professor Lennart Nilsson responsible for vocational learning and training at Gothenburg University, Gothenburg). The authoring just described (involving the initiated hinted just above) have occupied our minds for more than one decade (our co-authoring and work with specific Japanese research colleagues, have most certainly underlined a need for careful writing, since among other things just nicking the practitioners’ nomenclature will be misleading, as is also the case while relaying on one or a few scientific research areas) (see some of the other publications registrated in Chalmers Public Library CLP) (it is most certainly an extensive research area, and the skills needed to be mastered in order to understand are indeed wide). The underlying principles of any (real-life) assembly system must, according to our understanding, are inventible required to be explained. Thus, it is important for the analyst to grasp whether or not the principle applied is correct or if the practice is questionable. This means, metaphorically speaking, is the original drawings accurate or have the execution (practice) faulty. The two most sociotechnically advanced (real-life) assembly systems both proved to be successful (more efficient and flexible in relation to comparable assembly lines, and work and work conditions were far better). They were both based on correct principles (i.e. the nowadays defunct Volvo Uddevalla plant and the so-called assembly docks at the Volvo Tuve heavy truck chassis plant located in Gothenburg). As will become evident by the content brought forward in this extensive book manuscript. A comment. The most socio-technically advanced assembly system designs inventible requires reformed/reconfigured information systems dealing with product data (which in turn defines the product architecture and product variation). In fact, no any such (real-life) plant or assembly system would work as anticipated otherwise. And this publication is to some extent describing some selected aspects of this (very) dilemma (changing information systems are usually not something considered than designing assembly systems) (thus are totally new plants – and in turn totally new information systems – most often the real practical change to create something unorthodox) (however, which scientist will gain such opportunities, this is really rare, i.e. the projection of the Volvo Uddevalla plant was thus an exception and the trust given by the industry – by Volvo Uddevalla project organisation – was appreciated by some of the authors).
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| 30. |
- Engström, Tomas, 1950, et al.
(författare)
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Extended Work Cycle Assembly – A crucial learning and training experience, expansion and revision and of an earlier published article
- 2017
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- This article (or preprint not yet completed due to the retirement of one of the authors) is an expansion and revision of an earlier published article in International Journal of Human Factors in Manufacturing published in 1994, which reported on a crucial learning and training experience. Thereby were we able to validate one of the design principles (or concepts), which were applied in the defunct Volvo Automobile Corporation's assembly plant in Uddevalla. An experience carried out in the author's experimental workshop in Gothenburg that predated the final choice of assembly system design practised for full-scale production purposes. As was conducted in parallel with the (at this period) just initiated temporary learning and training workshop located in Uddevalla (started in 1987 and relocated in 1988). These design principles include the concept of holistic learning, specifically through the creation and transformation of a number complementary, interrelated physical, semantical and cognitive structures. As have been our understanding, or interpretation, of this concept using among other things disassembly of physical automobiles and using a specifically designed illustration system to depict the removed components. A so-called assembly-oriented product structure was developed and used locally in this particular assembly plant, which in the assembly plant allowed small parallel workgroups of seven or nine operators to learn and train the extensively long work cycle times. These workgroups were supported by an advanced material feeding technique using materials kits. This material feeding technique was thereby facilitating each operator's work in ways that were unique (serving as one out of several other aids for the extensive work content). We have before (in the original publication just mentioned) discussed the learning and training environment and aids, as well as the principle, was applied for assembly of one-quarter of an automobile performed by one single person (corresponding to more than two hours work cycle time in a fully runned-in assembly plant). In short, the activities, which prospected these aids were (1) familiarisation, (2) initial assembly work, (3) recapitulation of the initial assembly work, (4) recapitulating through disassembly and arranging the components. But also after that, (5) integration of previous assemblages, (6) organising the workplace, and (7) final mental recapitulation of the assembly process. And after that (8) final test assembly. In short, a fifteen years old trainee was more or less "forced to", during (only) two weeks stay within the experimental workshop, use some interrelated aids (to realise the various structures mentioned). He was unfamiliar with shop floor work within the automotive industry, albeit he was by no means impractical, and he was mechanical inclined already from the beginning). Through this learning and training experience (as have been reported before), it proved possible to dramatically reduce the learning and training times required for long cycle time assembly work. In comparison to e.g. what was going on within the temporary learning and training workshop, was the trainee during the final test assembly on the very last day of his stay in the experimental workshop gaining a performance of 1 200% above the work-pace within the temporary workshop in Uddevalla. A figure that was 150% of the estimated net-assembly time in the fully runned-in assembly plant, i.e. the time required for assembly excluding material handling and walking on a workstation. However, the resulting work cycle times within the final assembly plant were even far more extensive (e.g. approximate 25 operators were able to assemble complete automobiles single-handily). Note, this learning and training experience was pre-dating the final decision of choice of assembly system design, and it contributed this choice since it proved that work cycle times of two hours or more was a practical proposition for full-scale production purposes. Apart from some required rewritings of the original text mentioned above, the complementary revisions concern e.g. (1) decorating the article using photos of this particular learning and training experience (these were not included in the original article). Moreover, (2) some extra insights and experiences, successively gained after that, are also brought forward (the learning and training experience was executed in 1988, and this assembly plant in question operated 1989–1992). Please remember that this learning and training experience was, as said before, carried out some years before the assembly plant in question finally proved the flexibility and performance later reported in e.g. the author's other publication Nevertheless, the official such figures call for some extra comments. This assembly plant was closed down twenty-five years ago, which certainly also have given us extra time to reflect on the matters brought forward under this quite extensive time that has passed so far.
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| 31. |
- Engström, Tomas, 1950, et al.
(författare)
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Extended Work Cycle Assembly - A crucial learning experience
- 1994
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Ingår i: The International journal of human factors in manufacturing. - : Wiley. - 1045-2699 .- 1522-7111. ; 4:3, s. 293-303
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Tidskriftsartikel (refereegranskat)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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| 35. |
- Engström, Tomas, 1950, et al.
(författare)
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Implications for Improving the Flexibility of External Material Flow System Based on Theories and Experiences From Transforming the Assembly Line”.
- 1999
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- The most socio-technically advanced assembly system designs inventible requires reformed/reconfigured information systems dealing with product data (which in turn defines the product architecture and product variation). In fact, no any such (real-life) plant or assembly system would work as anticipated otherwise. And this publication is to some extent describing some selected aspects of this (very) dilemma (changing information systems are usually not something considered than designing assembly systems) (thus are totally new plants – and in turn totally new information systems – most often the real practical change to create something unorthodox) (however, which scientist will gain such opportunities, this is really rare, i.e. the projection of the Volvo Uddevalla plant was thus an exception and the trust given by the industry – by Volvo Uddevalla project organisation – was appreciated by some of the authors). A comment from yet another angle of approach: This publication explains the differences between administrative and physical modularisation, which in turn implies new opportunities to deal with so-called just-in-time (JIT) deliveries. Thus are e.g. the nowadays coagulated road traffic system, in fact, possible resolve (as were the product planning system that hampered the performance of the Volvo Uddevalla plant, it was relying on traditional codification of the product variants, thus were the reduced so-called production losses never possible to accumulate between automobiles for each and every small parallel workgroup) (the information system was totally new – nothing external was allowed to enter the shop floor of this plant – but still were some assembly line approaches was still at hand) (see other pubications registered in Chalmers Public Library CPL).
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| 36. |
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| 37. |
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| 38. |
- Engström, Tomas, 1950, et al.
(författare)
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Inter-Relation Between Product Variant Codification and Assembly Work for Flexible Manufacturing in Autonomous Group
- 1995
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Ingår i: Journal of Materials Processing Technology. ; 52, s. 133 - 140
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Tidskriftsartikel (refereegranskat)abstract
- The most socio-technically advanced assembly system designs inventible requires reformed/reconfigured information systems dealing with product data (which in turn defines the product architecture and product variation). In fact, no any such (real-life) plant or assembly system would work as anticipated otherwise. And this publication is to some extent describing some selected aspects of this (very) dilemma (changing information systems are usually not something considered than designing assembly systems) (thus are totally new plants – and in turn totally new information systems – most often the real practical change to create something unorthodox) (however, which scientist will gain such opportunities, this is really rare, i.e. the projection of the Volvo Uddevalla plant was thus an exception and the trust given by the industry – by Volvo Uddevalla project organisation – was appreciated by some of the authors).
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| 39. |
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| 40. |
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| 41. |
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| 42. |
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| 43. |
- Engström, Tomas, 1950, et al.
(författare)
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Principles of Work Structuring: A general and thus also more reasoning introduction
- 2016
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- This completed article (or preprint not yet finished to due to one the author’s retirement) is based on a more extensive publication that also is registered a preprint at Chalmers Public library (CPL) (i.e. Engström and Jonsson 2015 “Development and application of (certain) Principles for work structuring” a book manuscript of more than 600 pages twelve chapters and a number of freestanding appendixes) (a work that have occupied the authors' minds for almost two decades) (see the just mentioned publication that also is registered in CPL). The selected book content has been scrutinised yet another time by a professional with regard to the English language. However, in this particular case (for this article) have just some of the content in the more extensive publication been refined further by mean of a selection of the matters that have been judged as of common interest as well as possible to delimit to approximatively some one hundred pages. This in order to create a more legible publication which could be grasped by more readers than what usual are the case. The matters treated calls for a mastering of a number of different contexts, as well as a certain sort of preunderstanding numerous details, which need to be explained to most readers. This is actually an almost inevitable nature of the content in this completed article, even though (rather naturally) it is, of course, likely to blame such situation on the authors themselves. Please, remember that the research and development work dealt with cowers more than the four decades work of a cross and multi-disciplinary nature. That is a hard and intensive work of both practitioner and scientist from various scientific disciplines. Efforts which have been amalgamated by the common aim to develop alternatives to line assembly featuring e.g. parallel product flow assembly systems designs with small (parallel) autonomous workgroups. These unorthodox (real-life) assembly systems featured (what was international unique solely in just two Swedish cases) advanced materials feeding techniques and extensively long work cycle times (some nine percent of the assembly workers were officially able to master completing whole automobiles single-handedly, i.e. all by themselves) (some more were able to do so, but they were not interested in the official test required). As a sort of quintessence (final proof) of the sociotechnical research tradition in the Gothenburg area, were both (1) the nowadays defunct Volvo Uddevalla plant and (2) the closed down so-called assembly docks at the Volvo Tuve heavy truck chassis plant located in Gothenburg. These sociotechnical advanced, unorthodox (real-life) designs were in most respects the responsibility of one of the two authors and his colleagues. Who for nine years disposed a number of experimental workshops located outside the Chalmers University of technology that were used for disassembly of automobiles and heavy truck chassis (including analyses of the content in various Volvo information systems, a content which were displayed on original and customised paper print out exposed out on elbow-high large tables besides the decomposed automotive products. Such approach was unavoidably needed in order to e.g. construct the appropriate assembly work instruction for the extensively long work cycle time practised, and to thereby also revise product information harboured in the various information system. (The information systems available at this period of time proved in fact to be unable to support the very unfamiliar way to assemble the products in question. In fact, they were misleading thereby giving birth to a common misunderstanding of e.g. an immense number of product variants and a far too complex product perceived to be impossible to understand.) Finally, as said before the approximate hundred pages of the condensed more extensive publication have been rewritten by the two authors in connection to a successive proofreading by a professional (Lille-More Arnäs at the Linguae Company who is familiar with our linguistic usage and who has proof-read our publications for decades). The aim is to evolve the content further to thereby create a nucleus for our future work to finalize the more extensive publication. A comment: The most socio-technically advanced assembly system designs inventible requires reformed/reconfigured information systems dealing with product data (which in turn defines the product architecture and product variation). In fact, no any such (real-life) plant or assembly system would work as anticipated otherwise. And this publication is to some extent describing some selected aspects of this (very) dilemma (changing information systems are usually not something considered than designing assembly systems) (thus are totally new plants – and in turn totally new information systems – most often the real practical change to create something unorthodox) (however, which scientist will gain such opportunities, this is really rare, i.e. the projection of the Volvo Uddevalla plant was thus an exception and the trust given by the industry – by Volvo Uddevalla project organisation – was appreciated by some of the authors).
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| 44. |
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| 45. |
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| 46. |
- Engström, Tomas, 1950, et al.
(författare)
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Some Cognitive Engineering Aspects Applied to Product and Process Information within the Swedish Automotive Industry
- 2001
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- This publication partly explains how we had managed amalgamate manufacturing engineering according to our interpretation and e.g. Gestalt psychology (i.e. for the most socio-technically advanced assembly system designs). This is something that is elaborated further and better repetitively in other publications registered in Chalmers Public Library (CPL) (especially is this the case in some of the latest preprints/manuscripts). That is, how the learning and training principles advocated by the senior research competency within vocational learning and training were realised in practice for full-scale production purposes.
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| 47. |
- Engström, Tomas, 1950, et al.
(författare)
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Some Findings from Learning of Assembly Work in Sweden
- 1992
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)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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| 48. |
- Engström, Tomas, 1950, et al.
(författare)
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Successive Assembly System Design Based on disassembly of Products
- 1997
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)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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| 49. |
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| 50. |
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