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  • 1
    Monograph available for loan
    Monograph available for loan
    Basic methods of structural geology : part I, elementary techniques ; part II, special topics (1988)
    Englewood Cliffs, NJ : Prentice Hall
    Details Availability
    Call number: M 572
    Type of Medium: Monograph available for loan
    Pages: XVII, 446 S. : Ill., graph. Darst.
    ISBN: 0130651788
    Location: Upper compact magazine
    Branch Library: GFZ Library
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  • 2
    Electronic Resource
    Electronic Resource
    A prototype decision support system for strategic planning under uncertainty (2000)
    Bingley : Emerald
    International journal of physical distribution and logistics management 30 (2000), S. 640-661 
    Details
    ISSN: 0960-0035
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Economics
    Notes: Strategic planning of the supply chain is an important decision problem determining the long-term survival and prosperity of companies in the manufacturing, retail, and other industrial sectors. In general such companies rely on their information systems to acquire the essential data that are used in their planning models. The interaction of information systems and decision modelling, and the progressive transformation of data, into information, and knowledge is a key process underlying any decision support system (DSS) for strategic, tactical or operational planning. In this paper we consider a DSS for supply chain planning (SCP) decisions. The SCP system has an embedded decision engine that uses a two-stage stochastic program as a paradigm for optimisation under uncertainty. The system has been used for decision making in diverse domains, including automotive manufacturing and consumer products.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/09600030010346387
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  • 3
    Electronic Resource
    Electronic Resource
    Constraint Logic Programming and Integer Programming approaches and their collaboration in solving an assignment scheduling problem (1997)
    Springer
    Constraints 1 (1997), S. 245-264 
    Details
    ISSN: 1572-9354
    Keywords: constraint logic programming ; integer programming ; generalised assignment problem ; optimisation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract Generalised Assignment Problems (GAP), traditionally solved by Integer Programming techniques, are addressed in the light of current Constraint Programming methods. A scheduling application from manufacturing, based on a modified GAP, is used to examine the performance of each technique under a variety of problem characteristics. Experimental evidence showed that, for a set of assignment problems, Constraint Logic Programming (CLP) performed consistently better than Integer Programming (IP). Analysis of the CLP and IP processes identified ways in which the search was effective. The insight gained from the analysis led to an Integer Programming approach with significantly improved performance. Finally, the issue of collaboration between the two contrasting approaches is examined with respect to ways in which the solvers can be combined in an effective manner.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00137871
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  • 4
    Electronic Resource
    Electronic Resource
    Experimental investigations in combining primal dual interior point method and simplex based LP solvers (1995)
    Springer
    Annals of operations research 58 (1995), S. 19-38 
    Details
    ISSN: 1572-9338
    Keywords: Primal dual interior point methods ; simplex algorithm ; basis recovery
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Notes: Abstract The use of a primal dual interior point method (PD) based optimizer as a robust linear programming (LP) solver is now well established. Instead of replacing the sparse simplex algorithm (SSX), the PD is increasingly seen as complementing it. The progress of PD iterations is not hindered by the degeneracy or stalling problem of SSX, indeed it reaches the “near optimum” solution very quickly. The SSX algorithm, in contrast, is not affected by the numeral instabilities which slow down the convergence of the PD near the optimal face. If the solution to the LP problem is non-unique, the PD algorithm converges to an interior point of the solution set while the SSX algorithm finds an extreme point solution. To take advantage of the attractive properties of both the PD and the SSX, we have designed a hybrid framework whereby crossover from PD to SSX can take place at any stage of the PD optimization run. The crossover to SSX involves the partition of the PD solution set to active and dormant variables. In this paper we examine the practical difficulties in partitioning the solution set, we discuss the reliability of predicting the solution set partition before optimality is reached and report the results of combining exact and inexact prediction with SSX basis recovery.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02032308
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  • 5
    Electronic Resource
    Electronic Resource
    Preface (1995)
    Springer
    Annals of operations research 58 (1995), S. v 
    Details
    ISSN: 1572-9338
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02032306
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  • 6
    Electronic Resource
    Electronic Resource
    Modelling of augmented makespan assignment problems(AMAPs): Computational experience of applyinginteger presolve at the modelling stage (1998)
    Springer
    Annals of operations research 82 (1998), S. 269-288 
    Details
    ISSN: 1572-9338
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Notes: Abstract An Augmented Makespan Assignment Problem (AMAP), which is a variation of theGeneralised Assignment Problem (GAP), is analysed in this paper. In this problem, weminimise the makespan for producing several products with each on one of several machines.The data instances are such that some of the available machines are identical, which in turnleads to mixed integer programming problems that have many optimal integer solutions.Most commercial software for mathematical programming therefore has problems provingthat the solution they find is an optimal one. Even optimisation software that does someinteger preprocessing on the system of linear relations has problems in solving a straightforwardformulation of the model. Darby-Dowman et al. investigated this model and foundit difficult to solve as an IP. We show that if more of the model structure is highlighted at themodelling stage, and these are exploited in preprocessing the formulation before the problemmatrix is produced, then we get easily solvable integer programs for the data instances underconsideration. We give computational results for five different commercial codes with andwithout our preprocessing at the modelling stage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018914820426
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  • 7
    Electronic Resource
    Electronic Resource
    Detecting Embedded Networks in LP Using GUB Structures and Independent Set Algorithms (2000)
    Springer
    Computational optimization and applications 15 (2000), S. 235-247 
    Details
    ISSN: 1573-2894
    Keywords: linear programming ; generalized upper bounds ; network programming ; independent sets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract In this paper, we present an alternative multi-stage generalized upper bounds (GUB) based approach for detecting an embedded pure network structure in an LP problem. In order to identify a GUB structure, we use two different approaches; the first is based on the notion of Markowitz merit count and the second exploits independent sets in the corresponding graphs. Our computational experiments show that the multi-stage GUB algorithm based on these approaches performs favourably when compared with other well known algorithms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008791601215
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  • 8
    Electronic Resource
    Electronic Resource
    Sets and indices in linear programming modelling and their integration with relational data models (1995)
    Springer
    Computational optimization and applications 4 (1995), S. 263-283 
    Details
    ISSN: 1573-2894
    Keywords: sets ; indices ; linear programming modelling ; relational databases ; modelling languages ; model generation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract LP models are usually constructed using index sets and data tables which are closely related to the attributes and relations of relational database (RDB) systems. We extend the syntax of MPL, an existing LP modelling language, in order to connect it to a given RDB system. This approach reuses existing modelling and database software, provides a rich modelling environment and achieves model and data independence. This integrated software enables Mathematical Programming to be widely used as a decision support tool by unlocking the data residing in corporate databases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01300874
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  • 9
    Electronic Resource
    Electronic Resource
    Continuous Cellulase Production (1975)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 17 (1975), S. 1-13 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Trichoderma viride QM 9414 growth characteristics on glucose were investigated in single stage continuous stirred tank reactor operation and growth parameters μmax, Ks, QO2 identified. Multistage stirred tank fermentors in series with the first stage utilizing glucose and the subsequent stages utilizing cellulose yielded results in general agreement with theoretical predictions. Significant increase in enzyme productivity over single stage fermentation was obtained in multistage operation.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260170102
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  • 10
    Electronic Resource
    Electronic Resource
    Continuous fractionation of human plasma (1978)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 20 (1978), S. 1037-1044 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Continuous processing has been applied to human plasma fractionation by the cold ethanol process. On-line pH control of ±0.05 pH units, flow control of ±1%, and temperature control of ±0.5°C have been achieved. Optimization of precipitation pHs has been carried out for purifying plasma protein fractions and albumin. During precipitation, the irreversible nature of the pH overshoots has been demonstrated. Compared to the batch processing mode, the continuous scheme produces an increased yield between 6 to 11%.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260200706
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