3 resultados para GENERAL-SOLUTIONS

em Aston University Research Archive


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As many strategically important aspects of marketing are addressed by other functions in the organization, the decreased influence of the marketing department within companies is a topic of growing debate. In this study, the authors investigate this diminished influence and assess its determinants and consequences. They interviewed 25 marketing and finance executives from leading Dutch firms. They also conducted a large-scale Internet-based survey of several hundred marketing, finance, and general managers. Their results show that accountability and the innovativeness of the marketing department are the major drivers of the marketing department’s influence. They also demonstrate that a firm’s short-term orientation is negatively related to the influence of the marketing department. Marketing influence is positively related to market orientation, which is positively related to firm performance. Their results do not support prior findings of a direct positive link between marketing influence and firm performance, which might suggest that there is no need for a strong marketing department. The study suggests that an influential marketing department is relevant primarily when the firm is not market oriented. When firms are market oriented, a less influential marketing department does not lower their performance. Hence, it appears that they can choose to have an influential or noninfluential marketing department without any repercussions for their performance. Marketing activities could move to other functions. The authors suggest that marketing departments should aim to retain their influence. Dispersing marketing decision making among many functions can cause a lack of coordination; customers also lose their advocate within the firm. How can marketing departments regain their influence? The authors suggest two general solutions. First, marketing departments should become more accountable by linking marketing actions and policies with financial results. Marketers should become capable in analytics and finance. Second, they should become more innovative by increasing their share in new product or service concepts. They can do so by using their knowledge of the market and customers to contribute to new product or service development.

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The success of mainstream computing is largely due to the widespread availability of general-purpose architectures and of generic approaches that can be used to solve real-world problems cost-effectively and across a broad range of application domains. In this chapter, we propose that a similar generic framework is used to make the development of autonomic solutions cost effective, and to establish autonomic computing as a major approach to managing the complexity of today’s large-scale systems and systems of systems. To demonstrate the feasibility of general-purpose autonomic computing, we introduce a generic autonomic computing framework comprising a policy-based autonomic architecture and a novel four-step method for the effective development of self-managing systems. A prototype implementation of the reconfigurable policy engine at the core of our architecture is then used to develop autonomic solutions for case studies from several application domains. Looking into the future, we describe a methodology for the engineering of self-managing systems that extends and generalises our autonomic computing framework further.

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This thesis is concerned with exact solutions of Einstein's field equations of general relativity, in particular, when the source of the gravitational field is a perfect fluid with a purely electric Weyl tensor. General relativity, cosmology and computer algebra are discussed briefly. A mathematical introduction to Riemannian geometry and the tetrad formalism is then given. This is followed by a review of some previous results and known solutions concerning purely electric perfect fluids. In addition, some orthonormal and null tetrad equations of the Ricci and Bianchi identities are displayed in a form suitable for investigating these space-times. Conformally flat perfect fluids are characterised by the vanishing of the Weyl tensor and form a sub-class of the purely electric fields in which all solutions are known (Stephani 1967). The number of Killing vectors in these space-times is investigated and results presented for the non-expanding space-times. The existence of stationary fields that may also admit 0, 1 or 3 spacelike Killing vectors is demonstrated. Shear-free fluids in the class under consideration are shown to be either non-expanding or irrotational (Collins 1984) using both orthonormal and null tetrads. A discrepancy between Collins (1984) and Wolf (1986) is resolved by explicitly solving the field equations to prove that the only purely electric, shear-free, geodesic but rotating perfect fluid is the Godel (1949) solution. The irrotational fluids with shear are then studied and solutions due to Szafron (1977) and Allnutt (1982) are characterised. The metric is simplified in several cases where new solutions may be found. The geodesic space-times in this class and all Bianchi type 1 perfect fluid metrics are shown to have a metric expressible in a diagonal form. The position of spherically symmetric and Bianchi type 1 space-times in relation to the general case is also illustrated.