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Aerodynamic shape optimisation is a complex problem usually governed by transonic non-linear aerodynamics, a high dimensional design space and high computational cost. Consequently, the use of a numerical simulation approach can become prohibitive for some applications. This paper aims to propose a computationally efficient multi-fidelity method for the optimisation of two-dimensional axisymmetric aero-engine nacelles.

The nacelle optimisation approach combines a gradient-free algorithm with a multi-fidelity surrogate model. Machine learning based on artificial neural networks (ANN) is used as the modelling technique because of its ability to handle non-linear behaviour. The multi-fidelity method combines Reynolds-averaged Navier Stokes and Euler CFD calculations as high- and low-fidelity, respectively.

Ratios of low- and high-fidelity training samples to degrees of freedom of n_LF/n_DOFs = 50 and n_HF/n_DOFs = 12.5 provided a surrogate model with a root mean squared error less than 5% and a similar convergence to the optimal design space when compared with the equivalent CFD-in-the-loop optimisation. Similar nacelle geometries and aerodynamic flow topologies were obtained for down-selected designs with a reduction of 92% in the computational cost. This highlights the potential benefits of this multi-fidelity approach for aerodynamic optimisation within a preliminary design stage.

The application of a multi-fidelity technique based on ANN to the aerodynamic shape optimisation problem of isolated nacelles is the key novelty of this work. The multi-fidelity aspect of the method advances current practices based on single-fidelity surrogate models and offers further reductions in computational cost to meet industrial design timescales. Additionally, guidelines in terms of low- and high-fidelity sample sizes relative to the number of design variables have been established.

This chapter examines how groups' tactical selection shapes social movement mobilization and survival. I focus on 35 Indivisible groups founded in 10 American cities immediately after the 2017 Women's March. I analyze the descriptions of over 8,000 events on group Facebook pages from 2017–2019 and conduct 25 interviews with group members. These data allow me to assess how the type, diversity, and flexibility of tactics shape group mobilization and survival. I find that groups that use more protest and electoral tactics and those that use a diversity of tactics host more events and are more likely to survive over time. Being consistent in tactics was successful when groups used political tactics, particularly protest and electoral activities. Groups that engaged in a variety of tactics could also be successful, particularly in smaller and more conservative settings. This research illuminates the complex and situational ways that tactical choices matter for social movement longevity.

Social movement organizations are concerned and cognizant of their public image and typically need to maintain positive public perception to gain and sustain support. White supremacist organizations believe that they are highly stigmatized, reviled, and surveilled groups and go to great lengths to protect their desired self-representation. Through a qualitative analysis of close to 2 million Discord chat messages from white supremacist organizations, I find that white nationalist groups attempt to cater their public appearances through three primary axes: organizational, activism, and individual/membership. This chapter uses concepts from Goffmanian sociology, such as Stigma, Impression Management, and Frontstage/Backstage, to highlight how political movements discuss, argue, and debate the public image they wish to deploy. Studies on right-wing movements tend to be “externalist” in the sense that they look at publicly available documents which privilege the views of leadership. This chapter uses a dataset which delves into the social movement “backstage,” enabling us to view white supremacists' private conversations, their impression management strategies, and how they wish to appear on the “frontstage.”

The use of mobile digital devices requires secure behaviour while using these devices. To influence this behaviour, one should be able to adequately measure the behaviour. The purpose of this study is to establish a model for measuring secure behaviour, and to use this model to measure the secure behaviour of individuals while using mobile digital devices such as smartphones and laptops.

Based on a wide-ranging questionnaire (N = 1000), this study investigates the degree of influence that a relatively large number of factors have on secure behaviour while using mobile digital devices. These factors include knowledge and cognitive attitude, but also affective attitude, as well as several types of bias.

This study has provided a model for measuring secure behaviour. The results of the measurements show that knowledge, bias, cognitive attitude and affective attitude all have impact on secure behaviour while using mobile digital devices. Moreover, none of these factors is of minor importance.

This study shows that it is important to also consider previously undervalued factors, such as affective attitude and various types of bias, when designing interventions to improve secure behaviour while using mobile digital devices.

Most research on secure behaviour has only looked at a small number of influencing factors, usually limited to knowledge and cognitive attitude. This study shows that one needs a more elaborate model for measuring secure behaviour, and that previously undervalued factors have a clear influence on secure behaviour.

This study examines the effects of formal institutional distance (ID) on the foreign subsidiary global mandates (i.e. the subsidiary value-added role in terms of research and development (R&D), product management and supplying of inputs to the multinational enterprise (MNE) globally). Furthermore, it examines the mediating role of subsidiary autonomy for innovation in the relationship between formal ID and subsidiary global mandates.

Survey evidence from foreign subsidiaries in a remote developed economy, i.e. New Zealand, is obtained. Formal distance is measured based on the worldwide governance indicators (WGI), and the hypotheses are tested using structural equation modeling.

Results show that the direct link between formal ID and subsidiary global mandates is negative. However, autonomy for innovation as a mediator offsets this negative relationship, showing a positive mediating effect between formal ID and subsidiary global mandates.

This study extends research on foreign subsidiaries and their value-added roles in the MNE. We show the differentiated role of formal ID and indicate a contingency showing how the negative influence of formal ID on subsidiary global mandates can be offset. The inconsistent mediation of autonomy for innovation suggests that the concept of ID is multifaceted and complex, in contrast to the popular view that ID has only negative implications. Drawing upon evidence from a remote, developed economy and secondary data sources, we suggest how MNEs may positively use their formal ID with their subsidiaries.

This conceptual paper aims to present a new, integrated model for change readiness that focuses on affective sensemaking among intra-organizational members. Change processes are often hindered by lack of preparedness, which can be justified by organizational members' emotional resistance to change and divergent understandings of its meaning. Our paper proposes a normative model depicting the interactive process between middle-managers and employees until convergence of meaning is achieved and the organization is ready to change.

The authors offer a conceptual process model that describes how employees prepare for organizational change. The model illustrates how emotionally laden narratives enable employees to make sense of organizational change communicated by middle managers.

The sensemaking process is initiated by the negative emotions employees often experience when organizational change is first presented. Then middle managers must transform the negative felt emotions into positive valence via the strategic use of narratives that contain an affective component. This is done to increase the likelihood that convergent sensemaking takes place. Until this stage, intra-organizational members holding different perspectives about the need to change, engage in discussions in which the conflicting views are supported by the instrumental and systematic use of emotional tools with different valence.

First, we contribute to the change readiness literature by offering a detailed process for managers to influence individual readiness for change in their organizations. Our paper proposes a normative model depicting the interactive process between middle-managers and employees until convergence of meaning is achieved and the organization is ready to change. Future work needs to empirically test our model.

We contribute to the sensemaking literature by integrating positive and negative valence into the process for understanding organizational change. Finally, we contribute to our practical understanding of convergent sensemaking processes through the strategic use of narratives in organizations.

Our paper proposes a normative model depicting the interactive process between middle-managers and employees until convergence of meaning is achieved and the organization is ready to organizational and social change.

Our main contributions are three-fold. First, we contribute to the change readiness literature by offering a detailed process for managers to influence individual readiness for change in their organizations. Secondly, we contribute to the sensemaking literature by integrating positive and negative valence into the process for understanding organizational change. Finally, we contribute to our understanding of convergent sensemaking processes through the strategic use of narratives.

This chapter delves into sustainability-related competences in innovation management for further education as part of the European lifelong learning initiative. Despite extensive research in primary and secondary education, adult education often remains overlooked. Competence-based learning is a favored approach to integrating knowledge, skills, and attitudes across various domains. Through thematic analysis and deductive coding, the study examines 72 innovation management-related further education programs conducted in Baden-Württemberg, Germany, between June and December 2022. The findings unequivocally demonstrate the inclusion of sustainability competences in innovation-related further education. Notably, Strategic Competence emerges as the most prevalent, while Normative Competence appears least frequently. This research significantly advances the convergence of further education in innovation management, responsible management education, and competence-based learning, emphasizing the importance of sustainability competences in adult learning contexts. By shedding light on this underexplored domain, the study prompts further exploration and development of sustainable educational practices for lifelong learning.