289,865 research outputs found
Service Dominant Logic, Co-production and Co-creation: Model Development and Specifications
This paper set forth to examine the Service Dominant Logic paradigm, which is developed as an alternative paradigm to the Goods Dominant Logic, explore the developments that have occurred since its appearance in the Vargo and Lusch (2004) publication and attempt to identify the variables in this SD logic, as well as, its propositions; service co-production and value co-creation with the aim of verifying whether, or otherwise, the associated marketing variables could be put into operational model-building. The study found that there were identified marketing variables and using the assumption of linear relationship established multiple regression equations, it was found that it is feasible for such models, even more complex ones, conceptually to be developed in the foreseeable future. The paper does not claim to be exhaustive or definitive, but asserts that its usefulness lies in its demonstration that the time has come to start extensive research in making operational the SD Logic, lending it to closer scrutiny and academic/practical marketing investigations and use. Keywords: Marketing, service dominant logic, service co-production, value co-creation, model-building DOI: 10.7176/JMCR/64-03 Publication date: January 31st 202
A Structural Approach to Reversible Computation
Reversibility is a key issue in the interface between computation and
physics, and of growing importance as miniaturization progresses towards its
physical limits. Most foundational work on reversible computing to date has
focussed on simulations of low-level machine models. By contrast, we develop a
more structural approach. We show how high-level functional programs can be
mapped compositionally (i.e. in a syntax-directed fashion) into a simple kind
of automata which are immediately seen to be reversible. The size of the
automaton is linear in the size of the functional term. In mathematical terms,
we are building a concrete model of functional computation. This construction
stems directly from ideas arising in Geometry of Interaction and Linear
Logic---but can be understood without any knowledge of these topics. In fact,
it serves as an excellent introduction to them. At the same time, an
interesting logical delineation between reversible and irreversible forms of
computation emerges from our analysis.Comment: 30 pages, appeared in Theoretical Computer Scienc
Logic-Based Decision Support for Strategic Environmental Assessment
Strategic Environmental Assessment is a procedure aimed at introducing
systematic assessment of the environmental effects of plans and programs. This
procedure is based on the so-called coaxial matrices that define dependencies
between plan activities (infrastructures, plants, resource extractions,
buildings, etc.) and positive and negative environmental impacts, and
dependencies between these impacts and environmental receptors. Up to now, this
procedure is manually implemented by environmental experts for checking the
environmental effects of a given plan or program, but it is never applied
during the plan/program construction. A decision support system, based on a
clear logic semantics, would be an invaluable tool not only in assessing a
single, already defined plan, but also during the planning process in order to
produce an optimized, environmentally assessed plan and to study possible
alternative scenarios. We propose two logic-based approaches to the problem,
one based on Constraint Logic Programming and one on Probabilistic Logic
Programming that could be, in the future, conveniently merged to exploit the
advantages of both. We test the proposed approaches on a real energy plan and
we discuss their limitations and advantages.Comment: 17 pages, 1 figure, 26th Int'l. Conference on Logic Programming
(ICLP'10
On the Expressivity and Applicability of Model Representation Formalisms
A number of first-order calculi employ an explicit model representation
formalism for automated reasoning and for detecting satisfiability. Many of
these formalisms can represent infinite Herbrand models. The first-order
fragment of monadic, shallow, linear, Horn (MSLH) clauses, is such a formalism
used in the approximation refinement calculus. Our first result is a finite
model property for MSLH clause sets. Therefore, MSLH clause sets cannot
represent models of clause sets with inherently infinite models. Through a
translation to tree automata, we further show that this limitation also applies
to the linear fragments of implicit generalizations, which is the formalism
used in the model-evolution calculus, to atoms with disequality constraints,
the formalisms used in the non-redundant clause learning calculus (NRCL), and
to atoms with membership constraints, a formalism used for example in decision
procedures for algebraic data types. Although these formalisms cannot represent
models of clause sets with inherently infinite models, through an additional
approximation step they can. This is our second main result. For clause sets
including the definition of an equivalence relation with the help of an
additional, novel approximation, called reflexive relation splitting, the
approximation refinement calculus can automatically show satisfiability through
the MSLH clause set formalism.Comment: 15 page
Energy performance forecasting of residential buildings using fuzzy approaches
The energy consumption used for domestic purposes in Europe is, to a considerable extent, due to heating and cooling. This energy is produced mostly by burning fossil fuels, which has a high negative environmental impact. The characteristics of a building are an important factor to determine the necessities of heating and cooling loads. Therefore, the study of the relevant characteristics of the buildings, regarding the heating and cooling needed to maintain comfortable indoor air conditions, could be very useful in order to design and construct energy-efficient buildings. In previous studies, different machine-learning approaches have been used to predict heating and cooling loads from the set of variables: relative compactness, surface area, wall area, roof area, overall height, orientation, glazing area and glazing area distribution. However, none of these methods are based on fuzzy logic. In this research, we study two fuzzy logic approaches, i.e., fuzzy inductive reasoning (FIR) and adaptive neuro fuzzy inference system (ANFIS), to deal with the same problem. Fuzzy approaches obtain very good results, outperforming all the methods described in previous studies except one. In this work, we also study the feature selection process of FIR methodology as a pre-processing tool to select the more relevant variables before the use of any predictive modelling methodology. It is proven that FIR feature selection provides interesting insights into the main building variables causally related to heating and cooling loads. This allows better decision making and design strategies, since accurate cooling and heating load estimations and correct identification of parameters that affect building energy demands are of high importance to optimize building designs and equipment specifications.Peer ReviewedPostprint (published version
Statistical Modeling of Epistasis and Linkage Decay using Logic Regression
Logic regression has been recognized as a tool that can identify and model non-additive genetic interactions using Boolean logic groups. Logic regression, TASSEL-GLM and SAS-GLM were compared for analytical precision using a previously characterized model system to identify the best genetic model explaining epistatic interaction for vernalization-sensitivity in barley. A genetic model containing two molecular markers identified in vernalization response in barley was selected using logic regression while both TASSEL-GLM and SAS-GLM included spurious associations in their models. The results also suggest the logic regression can be used to identify dominant/recessive relationships between epistatic alleles through its use of conjugate operators
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