737,950 research outputs found

    Structural Modelling of Financial Constraints on Investment: Where Do We Stand?

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    This paper surveys issues with respect to the structural modelling of econometric tests of investment facing financial constraints, to their link with firms data and asset prices, and to their consequences for macroeconomic modelling. The key issue is to provide conditions which support the interpretation of the sensitivity of investment to liquidity variables such as cash flow as a measure of financial constraints. The structural modelling of investment facing financial constraints is also limited by the structural modelling of the forces driving investment dynamics such as adjustment costs, which has not been so successful empirically.Investment, Financial Constraints, Structural models

    Structural modelling of investment and financial constraints: Where do we stand?

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    This paper surveys issues with respect to the structural modelling of econometric tests of investment facing financial constraints, to their link with firms data and assets prices, and to their impact in macroeconomic modelling. The key issue is to ground much more the interpretation of the sensitivity of investment to liquidity variables such as cash flow as a measure of financial constraints. The structural modelling of investment facing financial constraints is also limited by the structural modelling of the force driving investment dynamics such as adjustment costs, which has not been so successful empirically.

    Structural Modelling Under Challenge

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    Over the last two decades or so macroeconometric modelling which was in vogue over the sixties and the seventies has ceased to be high on the academic agenda. This has been for a number of developments in macroeconomic theory and in econometric methodology. At the same time it is by no means true that macroeconometric modelling in the Cowles Commission tradition has been given up. Like all healthy disciplines the subject has incorporated some of the new developments and rejected some. Structural models continue to be used for policy formulation and continue to be used for policy formulation and evaluation all over the world because no viable alternative has emerged so far. This paper is intended to take stock of the prevailing situation and to suggest the course that the subject is likely to take in the years to come.

    As-Built 3D Heritage City Modelling to Support Numerical Structural Analysis: Application to the Assessment of an Archaeological Remain

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    Terrestrial laser scanning is a widely used technology to digitise archaeological, architectural and cultural heritage. This allows for modelling the assets’ real condition in comparison with traditional data acquisition methods. This paper, based on the case study of the basilica in the Baelo Claudia archaeological ensemble (Tarifa, Spain), justifies the need of accurate heritage modelling against excessively simplified approaches in order to support structural safety analysis. To do this, after validating the 3Dmeshing process frompoint cloud data, the semi-automatic digital reconstitution of the basilica columns is performed. Next, a geometric analysis is conducted to calculate the structural alterations of the columns. In order to determine the structural performance, focusing both on the accuracy and suitability of the geometric models, static and modal analyses are carried out by means of the finite element method (FEM) on three different models for the most unfavourable column in terms of structural damage: (1) as-built (2) simplified and (3) ideal model without deformations. Finally, the outcomes show that the as-built modelling enhances the conservation status analysis of the 3D heritage city (in terms of realistic compliance factor values), although further automation still needs to be implemented in the modelling process

    Component-based structural equation modelling

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    In this research, the authors explore the use of ULS-SEM (Structural-Equation-Modelling), PLS (Partial Least Squares), GSCA (Generalized Structured Component Analysis), path analysis on block principal components and path analysis on block scales on customer satisfaction data.Component-based SEM; covariance-based SEM; GSCA; path analysis; PLS path modelling; Structural Equation Modelling; Unweighted Least Squares

    Internal geometry of structurally stitched NCF preforms

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    Internal geometry of a textile reinforcement is an important factor of the reinforcement performance during the composite manufacturing and service life. In this article, generalized geometrical models of structural stitching loops are presented for the sewing, tufting, and dual-needle stitching methods. The term 'structural' presumes here that the stitching yarn does not only consolidate the plies (as the non-structural one does) but forms also a through-the-thickness (3D) reinforcement. The models account for the general features of the yarn loop geometry and are believed to allow for enough precise modelling on the meso-scale (textile unit cell) level. The modelling approach is validated with experimental data

    Ontology-based modelling of architectural styles

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    The conceptual modelling of software architectures is of central importance for the quality of a software system. A rich modelling language is required to integrate the different aspects of architecture modelling, such as architectural styles, structural and behavioural modelling, into a coherent framework. Architectural styles are often neglected in software architectures. We propose an ontological approach for architectural style modelling based on description logic as an abstract, meta-level modelling instrument. We introduce a framework for style definition and style combination. The application of the ontological framework in the form of an integration into existing architectural description notations is illustrated

    Applications of system dynamics modelling to computer music

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    Based on a composer's psycho-acoustic imagination or response to music, system dynamics modelling and simulation tools can be used as a scoring device to map the structural dynamic shape of interest of computer music compositions. The tools can also be used as a generator of compositional ideas reflecting thematic juxtaposition and emotional flux in musical narratives. These techniques allow the modelling of everyday narratives to provide a structural/metaphorical means of music composition based on archetypes that are shared with wider audiences. The methods are outlined using two examples
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