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1.
  • Aardal, Karen, et al. (författare)
  • Decomposition principles applied to the dynamic production and work-force scheduling problem
  • 1987
  • Ingår i: Engineering Costs and Production Economics. - 0167-188X. ; 12:1-4, s. 39-49
  • Tidskriftsartikel (refereegranskat)abstract
    • One of the most important problems in the production and inventory planning field, is the scheduling of production and work force in a dynamic environment. Although this problem can be formulated as a linear program, it is often quite difficult to solve directly, due to its large scale. Instead, it might be fruitful to use a decomposition approach. Decomposition, in general, means decomposing a difficult problem into several easier, or a sequence of easier problems which are later coordinated to reconstruct the original problem.In this report we discuss several possibilities of applying the most common decomposition principles, namely Benders (primal) and Datnzig-Wolfe (dual), as well as a relatively new decomposition method, called cross decomposition, to the dynamic, multiproduct production and employment planning problem. A number of special cases are also presented.
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4.
  • Abeysekera, John D.A., et al. (författare)
  • A head-model reconstruction based upon photogrammetric data from Sri Lankan adult males relevant to the design of headgear
  • 1989
  • Ingår i: Journal of Human Ergology. - 0300-8134. ; 18:2, s. 199-211
  • Tidskriftsartikel (refereegranskat)abstract
    • Due to the large variability in heads and faces in one population, the standard anthropometric dimensions of the head, measured from anatomical landmarks alone, may not suffice for the design of fitting headgear, e.g., helmets. To provide adequate data of the shapes and contours of the head to the designer, appropriate head models sculptured using comprehensive head dimensions, must be developed. This paper describes (a) a procedure of collecting comprehensive anthropometric data of the head using a photogrammetric method and (b) a simple sculpturing technique to reconstruct a head model of the user population
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6.
  • Abeysekera, John D.A., et al. (författare)
  • Body size variability between people in developed and developing countries and its impact on the use of imported goods
  • 1989
  • Ingår i: International Journal of Industrial Ergonomics. - 0169-8141. ; 4:2, s. 139-149
  • Tidskriftsartikel (refereegranskat)abstract
    • The Industrially Developing Countries (IDC) today, to a great extent, depend on Industrialized Countries (IC) for the supply of most industrial goods. An attempt has been made to ascertain the degree of design incompatibility experienced by users of these imported goods due to differences in the body sizes of people in producer and user countries. A comparative study of variations in body sizes is made from data available in literature and from anthropometric surveys. The results reveal differences in almost every part of the human body. The need for reliable anthropometric data in respect of IDC is stressed. Urgent measures are required to introduce changes in equipment, particularly for the benefit of users in IDC.
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7.
  • Abeysekera, John D.A., et al. (författare)
  • Effect of the hot environment on man
  • 1988
  • Ingår i: International Symposium on Work in a Hot Environment and Heat Related Disorders, Khartoum 27-31 Jan. 1988.
  • Konferensbidrag (övrigt vetenskapligt)
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