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  • ECONIS (ZBW)  (604)
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  • 1
    Language: German
    In: Der Betrieb : Betriebswirtschaft, Steuerrecht, Wirtschaftsrecht, Arbeitsrecht, 2011, Vol.64(36), pp. 1999-2002
    ISSN: 00059935
    Source: Deutsche Zentralbibliothek für Wirtschaftswissenschaften
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  • 2
    Language: English
    In: Journal of Business Research, May 2014, Vol.67(5), pp.1007-1017
    Description: Good corporate reputation is one of the most valuable assets and causes a multitude of favorable impacts within different stakeholder groups. As a consequence, a lot of studies analyze the relationship between corporate reputation and financial performance. However, most of them raise the question of causation due to their methodology. In order to isolate the causal impact of corporate reputation on financial performance, some authors conduct event studies, but without remarkable success. Therefore, this study provides initially a comprehensive theoretical background for why reputation should affect financial performance. According to the resulting hypotheses, an event study is conducted to analyze the impact of the publication of reputation rankings by the German on share prices. As hypothesized, positive and negative announcement effects exist regarding upgraded or downgraded companies respectively. Consequently, investors gain new information from the published rankings (increases or decreases in reputation) to adjust share prices.
    Keywords: Corporate Reputation ; Reputation Ranking ; Financial Performance ; Shareholder Value ; Event Study ; Portfolio Study ; Business ; Economics
    ISSN: 0148-2963
    E-ISSN: 1873-7978
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  • 3
    Language: English
    In: European Management Journal, June 2018, Vol.36(3), pp.381-391
    Description: This explorative empirical study investigates which sets of portfolio restructuring design characteristics, contingent on individual firm and industry characteristics, lead to successful business portfolio transformations. We draw on insights from the strategic change, strategic fit, and organizational turnaround literature and develop a contingency model for transformation success. To allow for complex configurations, we employ a set-theoretic approach based on fuzzy set qualitative comparative analysis (fsQCA). Our findings suggest that there is no single best strategy for restructuring a portfolio. Rather, there are multiple pathways to success in portfolio transformation, depending on a firm's competitive posture and industry environment. In particular, our results highlight the pivotal influence of prior firm performance and environmental jolts on the design of successful business portfolio restructuring (BPR) strategies.
    Keywords: Corporate Restructuring ; Business Portfolio Transformation ; Strategic Change ; Contingency Model ; Set-Theoretic Methods ; Fuzzy Set Qualitative Comparative Analysis (Fsqca) ; Business
    ISSN: 0263-2373
    E-ISSN: 1873-5681
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  • 4
    Language: English
    In: International Journal of Production Economics, September 2013, Vol.145(1), pp.67-77
    Description: We propose a two-stage hyper-heuristic for the generation of a set of work centre-specific dispatching rules. The approach combines a genetic programming (GP) algorithm that evolves a composite rule from basic job attributes with an evolutionary algorithm (EA) that searches for a good assignment of rules to work centres. The hyper-heuristic is tested against its two components and rules from the literature on a complex dynamic job shop problem from semiconductor manufacturing. Results show that all three hyper-heuristics are able to generate (sets of) rules that achieve a significantly lower mean weighted tardiness than any of the benckmark rules. Moreover, the two-stage approach proves to outperform the GP and EA hyper-heuristic as it optimises on two different heuristic search spaces that appear to tap different optimisation potentials. The resulting rule sets are also robust to most changes in the operating conditions.
    Keywords: Hyper-Heuristics ; Dispatching Rules ; Production Scheduling ; Semiconductor Manufacturing ; Evolutionary Algorithms ; Genetic Programming ; Engineering ; Business
    ISSN: 0925-5273
    E-ISSN: 1873-7579
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  • 5
    Language: English
    In: Mathematics of operations research, 2014, Vol.39(3), pp. 841-850
    Description: On the interior of a regular convex cone K in n-dimensional real space there exist two canonical Hessian metrics, the one generated by the logarithm of the characteristic function, and the Cheng-Yau metric. The former is associated with a self-concordant logarithmically homogeneous barrier on K, the universal barrier. It is invariant with respect to the unimodular automorphism subgroup of K and is compatible with the operation of taking product cones, but in general it does not behave well under duality. Here we introduce a barrier associated with the Cheng-Yau metric, the canonical barrier. It shares with the universal barrier the invariance, existence, and uniqueness properties and is compatible with the operation of taking product cones, but in addition is well behaved under duality. The canonical barrier can be characterized as the convex solution of the partial differential equation log det F" = 2F that tends to infinity as the argument tends to the boundary of K. Its barrier parameter does not exceed the dimension n of the cone. On homogeneous cones both barriers essentially coincide. Keywords: interior-point methods; self-concordant barriers; convex cones MSC2000 subject classification: Primary: 90C51; secondary: 90C25 OR/MS subject classification-. Primary: programming, nonlinear convex; secondary: mathematics, convexity
    Keywords: Canonical Correlation (Statistics) – Analysis ; K-Theory (Mathematics) – Models;
    ISSN: 0364765X
    E-ISSN: 15265471
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  • 6
    Language: German
    In: Wirtschaftsdienst, 2011, Vol.91(4), pp.244-248
    Description: Die Haushalte der ostdeutschen Länder müssen in den nächsten Jahren das Auslaufen des Solidarpakts II verkraften. Daraus ergeben sich Herausforderungen, denen die ostdeutschen Länder begegnen müssen. Einige dieser Länder, wie beispielsweise Sachsen, sind gegen den Rückgang der Finanzmittel besser gewappnet als andere. Hier werden Handlungsoptionen aufgezeigt.
    Keywords: Economics / Management Science ; Economics General ; Labor Economics ; Economic Policy ; Macroeconomics/Monetary Economics ; Economics;
    ISSN: 0043-6275
    E-ISSN: 1613-978X
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  • 7
    Language: English
    In: Ecological Economics, 2009, Vol.68(11), pp.2825-2833
    Description: Addressing uncertainty is a key requirement to follow the principle of precaution in sustainable ecosystem management. The maximization of worst-case outcomes according to the “maximin” decision rule, based on the two parameters mean and variance of a financial indicator, is a prominent approach to integrate uncertainty in decision-making. In forestry, the problem of selecting the optimum tree species combination for a forest plantation investment can be seen as a problem of optimal portfolio selection, to be solved according to the “maximin” decision rule. Yet, it is well known that portfolios computed from expected means and variances are highly sensitive to changes in the estimated parameters. The financial results may be poor if we rely too much on the historical data. This paper tests an extended worst-case model that considers a lower bound for the expected mean net present value (NPV) of a tree species portfolio and an upper bound for its variance. Biased expected mean NPVs, variances and correlations for the tree species [L.] Karst. (Spruce) and L. (Beech) were used to test the variability of the resulting tree species portfolios (27 scenarios). A comprehensive simulated data set, which was adopted from an existing study and defined as the independent reference, served to evaluate the financial performance of the tree species portfolios obtained from optimization with the biased data. Compared with the results of classical worst-case optimization instances, it was feasible to reduce the variability of tree species shares effectively when the optimization was carried out with the extended worst-case approach. Furthermore, the financial performance of this approach was better when tested with the independent data. The worst-case forest NPVs achieved with the extended approach were on average 10% (statistical confidence 0.95) or 147% (statistical confidence 0.99) greater in comparison to the results of the classical approach. The influence of the uncertainty parameter selection was tested and the results were discussed against the controversial viewpoints on the usefulness of the “information-gap decision theory”. Finally, the significance of our results for sustainable ecosystem management is pointed out.
    Keywords: Severe Uncertainty ; “maximin” Decision Rule ; Worst-Case Modeling ; Diversification ; Information-Gap Decision Theory ; Environmental Sciences ; Ecology ; Economics
    ISSN: 0921-8009
    E-ISSN: 1873-6106
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  • 8
    Language: English
    In: International journal of production research : American Institute of Industrial Engineers ; Society of Manufacturing Engineers, 2016, Vol.54(21), pp. 6812-6824
    ISSN: 00207543
    Source: Deutsche Zentralbibliothek für Wirtschaftswissenschaften
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  • 9
    Language: German
    In: Der Betriebswirt : Management in Wissenschaft und Praxis, 2016, Vol.57(4), pp. 30-33
    ISSN: 0340854X
    Source: Deutsche Zentralbibliothek für Wirtschaftswissenschaften
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  • 10
    Language: English
    In: Der Betriebswirt : Management in Wissenschaft und Praxis, 2014, Vol.55(2), pp. 36
    ISSN: 0340854X
    Source: Deutsche Zentralbibliothek für Wirtschaftswissenschaften
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