Zoekresultaten

AI-based exhaust gas temperature

Data-driven condition-based maintenance (CBM) and predictive maintenance (PdM) strategies have emerged over recent years and aim at minimizing the aviation maintenance costs and environmental impact by the diagnosis and prognosis of aircraft systems. As the use of data and relevant algorithms is essential to AI-based gas turbine diagnostics, there are different technical, operational, and regulatory challenges that need to be tackled in order for the aeronautical industry to be able to exploit their full potential. In this work, the machine learning (ML) method of the generalised additive model (GAM) is used in order to predict the evolution of an aero engine’s exhaust gas temperature (EGT). Three different continuous synthetic data sets developed by NASA are employed, known as New Commercial Modular Aero-Propulsion System Simulation (N-CMAPSS), with increasing complexity in engine deterioration. The results show that the GAM can be predict the evolution of the EGT with high accuracy when using several input features that resemble the types of physical sensors installed in aero gas turbines currently in operation. As the GAM offers good interpretability, this case study is used to discuss the different data attributes a data set needs to have in order to build trust and move towards certifiable models in the future.

A model of luxury lodge experience quality

Experience quality has been studied for many decades in various contexts. While understanding of experience quality has advanced, its context-specific and multi-dimensional nature has challenged its conceptualisation. With the rise of experiential accommodation in tourism and hospitality, luxury lodges have been increasingly recognised in the industry and by customers as the emblem of luxury experiences, albeit receiving limited scholarly attention. Through a qualitative multiple-case study methodology, utilising high-engagement research techniques, this study explores the dimensions and determinants of luxury lodge experience quality. The study presents an experience quality model grounded in empirical data, bridging various experience quality theoretical perspectives to explain the luxury lodge experience, and demonstrating generalisation capabilities for other service contexts. The study contributes to the ongoing discourse on experience quality, particularly in the context of small luxury accommodation. The study also offers important practical implications for luxury accommodation operators on designing, staging and managing quality experiences.

Clinimetrics: Assessment of generalised joint hypermobility: the Beighton score

Developing a viable business model for community owned solar farms in the Netherlands

The goal of this paper is twofold: i) to design a viable business model for community owned solar farms that will be setup in the north of the Netherlands. ii) To present the findings from this case study, and to propose generalisations that are relevant for the development of artefacts that can be used to facilitate the design of viable business models in a business ecosystem setting.USE 2015

The added value of therapist communication on the effect of physical therapy treatment in older adults; a systematic review and meta-analysis

ObjectiveLower physical activity levels in older adults are associated with increased co-morbidities and disability. Physical therapists have a critical role in facilitating increases in physical activity. The communication they use may impact their effectiveness. This study investigates the additional value of therapist’s communication during physical therapy on older adults’ physical activity levels. Methods Systematic review and meta-analysis. Clinical trials were identified in PubMed, CINAHL, Embase, PsycINFO, PEDro, Cochrane, up to July 2016. Communication was classified with the Behavior Change Taxonomy(BCT). Effect sizes were pooled using Cochrane’s Review-Manager. Strength of the evidence was analyzed using GRADE’s criteria. Results Twelve studies were identified. Overall, communication techniques revealed an immediate and long-term effect(ES:0.19;0.24) on self-reported physical activity measures but not on performance-based, with moderate to high strength of evidence. Divided in BCT-categories, only ‘Generalisation of target behavior’, defined as communication aimed to help patients generalise an exercise from one situation to another at home), had a positive effect on self-reported activity(ES:0.34), with low strength of evidence.Conclusion Adding a communication technique to physical therapy is effective on self-reported physical activity measures but not on performance-based measures.Practice implicationsAdd communication to exercise when treatment aims at perceived, but not performed, physical activity.

The added value of business models

An overview of innovations in a particular area, for example retail developments in the fashion sector (Van Vliet, 2014), and a subsequent discussion about the probability as to whether these innovations will realise a ‘breakthrough’, has to be supplemented with the question of what the added value is for the customer of such a new service or product. The added value for the customer must not only be clear as to its direct (instrumental or hedonic) incentives but it must also be tested on its merits from a business point of view. This requires a methodology. Working with business models is a method for describing the added value of products/services for customers in a systematic and structured manner. The fact that this is not always simple is evident from the discussions about retail developments, which do not excel in well-grounded business models. If there is talk about business models at all, it is more likely to concern strategic positioning in the market or value chain, or the discussion is about specifics like earning- and distribution-models (see Molenaar, 2011; Shopping 2020, 2014). Here we shall deal with two aspects of business models. First of all we shall look at the different perspectives in the use of business models, ultimately arriving at four distinctive perspectives or methods of use. Secondly, we shall outline the context within which business models operate. As a conclusion we shall distil a research framework from these discussions by presenting an integrated model as the basis for further research into new services and product.