235 research outputs found

    Servitization and operations management: a service-dominant logic approach

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    Authors' pre-print draft; earlier version issued as working paper. Final version published in International Journal of Operations & Production Management. Available online at http://www.emeraldinsight.com/The accepted author manuscript version is in ORE: http://hdl.handle.net/10871/31585Purpose – The purpose of this paper is to provide further insight into operations management of the product-service (P-S) transition, known as servitization, and the resulting product service system (PSS) offerings. In exploring the P-S transition, this paper adopts a service-dominant (S-D) logic view of value creation, using it as a lens through which to explore value propositions of the P-S transition and their operations design. Design/methodology/approach – This paper presents an in-depth case study of an original equipment manufacturer of durable capital equipment who, over the last five years, has expanded its offerings to include use- and result-orientated PSS. The research design uses a multi-method approach; employing 28 in-depth qualitative interviews with customers and employees and analysis of texts, documents and secondary data including five years of enterprise resource planning (ERP), call centre and contract data. Findings – The paper identifies ten generic P-S attributes that are abstracted into four nested value propositions: asset value proposition; recovery value proposition; availability value proposition; and outcome value proposition. In examining the operations design for delivery of these value propositions, it is found that the role and importance of contextual variety increases as the organisation moves through the value propositions. Interdependencies amongst the value propositions and differences in operational design for each value proposition are also found. Research limitations/implications – The paper investigates PSS through a S-D logic mindset. First, the paper considers value propositions of PSS not according to “product” or “service” but in terms of how resources (both material and human) are optimally designed to co-create customer value. Second, a value co-creation system of nested value propositions is illustrated. In so doing, the findings have a number of implications for literature on both PSS and S-D logic. In addition, the research adds to the PSS literature through the identification and consideration of the concept of contextual use variety. Practical implications – The paper demonstrates the complexity of the transition from product to service. Specifically, service cannot be seen as a bolt-on extra to their product offering; complexity caused by interactions and changes to the core offering require a systems perspective and consideration of both firm and customer skills and resources. Originality/value – This paper extends existing literature on the P-S transition and its implications for operations management. Notably, it takes an S-D logic perspective of value creation and in so doing highlights the importance and role of contextual use variety in the P-S transition. It also provides further empirical evidence that the P-S transition cannot be treated as discrete stages but is evolutionary and requires a complex systems perspectiv

    The Energy Density of "Wound" Fields in a Toroidal Universe

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    The observational limits on the present energy density of the Universe allow for a component that redshifts like 1/a21/a^2 and can contribute significantly to the total. We show that a possible origin for such a contribution is that the universe has a toroidal topology with "wound" scalar fields around its cycles.Comment: 11 pages, 1figur

    Phantom Field with O(N) Symmetry in Exponential Potential

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    In this paper, we study the phase space of phantom model with O(\emph{N}) symmetry in exponential potential. Different from the model without O(\emph{N}) symmetry, the introduction of the symmetry leads to a lower bound w>3w>-3 on the equation of state for the existence of stable phantom dominated attractor phase. The reconstruction relation between the potential of O(\textit{N}) phantom system and red shift has been derived.Comment: 5 pages, 3 figures, replaced with the version to appear on Phys. Rev.

    Chaotic scalar fields as models for dark energy

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    We consider stochastically quantized self-interacting scalar fields as suitable models to generate dark energy in the universe. Second quantization effects lead to new and unexpected phenomena is the self interaction strength is strong. The stochastically quantized dynamics can degenerate to a chaotic dynamics conjugated to a Bernoulli shift in fictitious time, and the right amount of vacuum energy density can be generated without fine tuning. It is numerically observed that the scalar field dynamics distinguishes fundamental parameters such as the electroweak and strong coupling constants as corresponding to local minima in the dark energy landscape. Chaotic fields can offer possible solutions to the cosmological coincidence problem, as well as to the problem of uniqueness of vacua.Comment: 30 pages, 3 figures. Replaced by final version accepted by Phys. Rev.

    Systematic Study of Fermion Masses and Mixing Angles in Horizontal SU(2) Gauge Theory

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    Despite its great success in explaining the basic interactions of nature, the standard model suffers from an inability to explain the observed masses of the fundamental particles and the weak mixing angles between them. We shall survey a set of possible extensions to the standard model, employing an SU(2) ``horizontal'' gauge symmetry between the particle generations, to see what light they can shed on this problem.Comment: 43 pages, 4 figures (available by postal mail on request), OZ-92/0

    Dark energy from conformal symmetry breaking

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    The breakdown of conformal symmetry in a conformally invariant scalar-tensor gravitational model is revisited in the cosmological context. Although the old scenario of conformal symmetry breaking in cosmology containing scalar field has already been used in many earlier works, it seems that no special attention has been paid for the investigation on the possible connection between the breakdown of conformal symmetry and the existence of dark energy. In this paper, it is shown that the old scenario of conformal symmetry breaking in cosmology, if properly interpreted, not only has a potential ability to describe the origin of dark energy as a symmetry breaking effect, but also may resolve the coincidence problem.Comment: 11 pages, minor revision, published online in EPJ

    An accelerated closed universe

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    We study a model in which a closed universe with dust and quintessence matter components may look like an accelerated flat Friedmann-Robertson-Walker (FRW) universe at low redshifts. Several quantities relevant to the model are expressed in terms of observed density parameters, ΩM\Omega_M and ΩΛ\Omega_{\Lambda}, and of the associated density parameter ΩQ\Omega_Q related to the quintessence scalar field QQ.Comment: 11 pages. For a festschrift honoring Alberto Garcia. To appear in Gen. Rel. Gra

    Cosmic coincidence problem and variable constants of physics

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    The standard model of cosmology is investigated using time dependent cosmological constant Λ\Lambda and Newton's gravitational constant GG. The total energy content is described by the modified Chaplygin gas equation of state. It is found that the time dependent constants coupled with the modified Chaplygin gas interpolate between the earlier matter to the later dark energy dominated phase of the universe. We also achieve a convergence of parameter ω1\omega\to-1, with minute fluctuations, showing an evolving ω\omega. Thus our model fairly alleviates the cosmic coincidence problem which demands ω=1\omega=-1 at present time.Comment: 27 pages, 15 figure

    Potential-density pairs for axisymmetric galaxies: the influence of scalar fields

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    We present a formulation for potential-density pairs to describe axisymmetric galaxies in the Newtonian limit of scalar-tensor theories of gravity. The scalar field is described by a modified Helmholtz equation with a source that is coupled to the standard Poisson equation of Newtonian gravity. The net gravitational force is given by two contributions: the standard Newtonian potential plus a term stemming from massive scalar fields. General solutions have been found for axisymmetric systems and the multipole expansion of the Yukawa potential is given. In particular, we have computed potential-density pairs of galactic disks for an exponential profile and their rotation curves.Comment: 8 pages, no figures, corrected version to the one that will appear in Gen. Relativ. Gravit., where a small typo in eq. (13) is presen

    Interacting Three Fluid System and Thermodynamics of the Universe Bounded by the Event Horizon

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    The work deals with the thermodynamics of the universe bounded by the event horizon. The matter in the universe has three constituents namely dark energy, dark matter and radiation in nature and interaction between then is assumed. The variation of entropy of the surface of the horizon is obtained from unified first law while matter entropy variation is calculated from the Gibbss' law. Finally, validity of the generalized second law of thermodynamics is examined and conclusions are written point wise.Comment: 7 page
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