Stefan Schwarz and Ekkehard Ramm
The present contribution deals with the sensitivity analysis and optimization of structures for path‐dependent structural response. Geometrically as well as materially non‐linear…
Abstract
The present contribution deals with the sensitivity analysis and optimization of structures for path‐dependent structural response. Geometrically as well as materially non‐linear behavior with hardening and softening is taken into account. Prandtl‐Reuss‐plasticity is adopted so that not only the state variables but also their sensitivities are path‐dependent. Because of this the variational direct approach is preferred for the sensitivity analysis. For accuracy reasons the sensitivity analysis has to be consistent with the analysis method evaluating the structural response. The proposed sensitivity analysis as well as its application in structural optimization is demonstrated by several examples.
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Henna Hasson, Ulrica von Thiele Schwarz, Stefan Holmstrom, Maria Karanika-Murray and Susanne Tafvelin
This paper aims to evaluate whether training of managers at workplaces can improve organizational learning. Managers play a crucial role in providing opportunities to employees…
Abstract
Purpose
This paper aims to evaluate whether training of managers at workplaces can improve organizational learning. Managers play a crucial role in providing opportunities to employees for learning. Although scholars have called for intervention research on the effects of leadership development on organizational learning, no such research is currently available.
Design/methodology/approach
The training program consisted of theoretical and practical elements aimed to improve line managers’ transformational leadership behaviors and, in turn, improve organizational learning. The study used a pre- and post-intervention evaluation survey. Line managers’ and their subordinates’ perceptions of organizational learning were measured with the Dimensions of Organizational Learning Questionnaire and with post-intervention single items on organizational learning.
Findings
Comparisons between pre- and post-intervention assessments revealed that managers’ ratings of continuous learning and employees’ ratings of empowerment and embedded systems improved significantly as a result of the training. The leadership training intervention had positive effects on managers’ perceptions of individual-level and on employees’ perceptions of organizational-level aspects of organizational learning.
Originality/value
The study provides empirical evidence that organizational learning can be improved through leadership training. Both line managers and their subordinates perceived that organizational learning had increased after the training intervention, albeit in different ways. Implications for developing leadership training programs and for evaluating these are discussed.
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Stefan Brauckmann and Alexandra Schwarz
School leadership is considered a central agent in the implementation of “New Governance” concepts which have been introduced in Germany by means of accountability measures…
Abstract
Purpose
School leadership is considered a central agent in the implementation of “New Governance” concepts which have been introduced in Germany by means of accountability measures, decentralization and a growth of autonomy and competition. With the adjustment of policies, rights and duties of school leaders have changed considerably. The purpose of this paper is to contribute to leadership research by providing descriptive evidence on the relevance of specific areas of leadership activity reported by school principals and their actual priorities in terms of day-to-day workload. In particular, the authors analyze whether individually reported priorities are reflected in the actual distribution of workload in a daily routine.
Design/methodology/approach
The empirical analysis uses data collected in the German SHaRP study (“School leaders’ activities between more responsibility and more power”). Based on a sample of 153 school leaders from six German federal states the authors perform regression models to determine the association between workload in specific fields of leadership activity, individually reported relevance of management tasks and systemic and contextual conditions at school.
Findings
As expected, organizational and personnel management and development are stated to be most important for leadership activity. These priorities are not at least reflected in the observed distribution of workload over fields of activity. Rather, a vast amount of time – as far as it is not absorbed by lessons – is spent on administrative tasks. A shift of workload from teaching responsibilities to governmental tasks is mainly achieved by longer working hours and appears to depend primarily on the system context.
Research limitations/implications
The results highlight the relevance of organizational skills and the need to develop conceptual foundations for strategic leadership at schools. Further research should focus not only on the contextual setting and system characteristics, but on the interplay of contextual characteristics and leadership strategies. In times of increasing budgetary constraints leadership research needs to consider outcome measures in terms of quality of schooling to identify determinants of effective leadership.
Originality/value
The paper contributes to leadership research by a quantitative analysis of the individually reported relevance of organizational, curricular and human resources management and development for leadership activity. The authors provide descriptive evidence on a significant gap between these claims and reality in terms of actual day-to-day workload.
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Christian Meske, Iris Junglas and Stefan Stieglitz
Enterprise social networks (ESNs) in organizations have become an increasingly important technology to support the exchange of information and knowledge. Many ESN projects fail…
Abstract
Purpose
Enterprise social networks (ESNs) in organizations have become an increasingly important technology to support the exchange of information and knowledge. Many ESN projects fail due to insufficient engagement in the long run, leading to the high risk of sunk costs. The purpose of this paper is to investigate how hedonic motivations, along with normative motivations, play an important role in determining an employee’s intention to continuously participate in ESN. Based on the Four-Drive Model and hence borrowing from behavioral economics, it is investigated how such hedonic motivations emerge in organizational ESNs.
Design/methodology/approach
This study is set within the context of a global enterprise of the logistics and courier industry. The authors first derived hypotheses from the Four-Drive Model to build the research model on the emergence of hedonic motivation. Then, the authors derived hypotheses from existing adoption literature regarding the impact of hedonic motivations and normative motivations on ESN use continuance. Following, a quantitative survey was conducted to test these hypotheses. In the study, structural equation modeling is applied, based on partial least squares.
Findings
The results show that the extent to which an ESN supports the drives to comprehend, acquire, bond and defend starkly influences an employee’s hedonic motivations. In addition, it is shown that hedonic motivations have a much stronger influence on use continuance than normative motivations.
Originality/value
Research on hedonic motivations in the work context is still underrepresented, in management science as well as information systems (IS) research. Hence, theoretical approaches to explain and predict the emergence of hedonic motivations in IS usage are missing. With the study, the authors will close this theoretical gap. The study contributes to IS research not only by evaluating the role of hedonic motivation for ESN usage, but also by providing an approach to explain key drivers behind it. To the best of the authors’ knowledge, this is the first study to empirically test the Four-Drive Model in a voluntary IS context, adding valuable knowledge about human behaviors in digital work environments.
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Joern Birkmann, Holger Sauter, Ali Jamshed, Linda Sorg, Mark Fleischhauer, Simone Sandholz, Mia Wannewitz, Stefan Greiving, Bjoern Bueter, Melanie Schneider and Matthias Garschagen
Enhancing the resilience of cities and strengthening risk-informed decision-making are defined as key within the Global Agenda 2030. Implementing risk-informed decision-making…
Abstract
Purpose
Enhancing the resilience of cities and strengthening risk-informed decision-making are defined as key within the Global Agenda 2030. Implementing risk-informed decision-making also requires the consideration of scenarios of exposure and vulnerability. Therefore, the paper presents selected scenario approaches and illustrates how such vulnerability scenarios can look like for specific indicators and how they can inform decision-making, particularly in the context of urban planning.
Design/methodology/approach
The research study uses the example of heat stress in Ludwigsburg, Germany, and adopts participatory and quantitative forecasting methods to develop scenarios for human vulnerability and exposure to heat stress.
Findings
The paper indicates that considering changes in future vulnerability of people is important to provide an appropriate information base for enhancing urban resilience through risk-informed urban planning. This can help cities to define priority areas for future urban development and to consider the socio-economic and demographic composition in their strategies.
Originality/value
The value of the research study lies in implementing new qualitative and quantitative scenario approaches for human exposure and vulnerability to strengthen risk-informed decision-making.
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Stefan Brauckmann and Alexandra Schwarz
Although policy makers strengthen the necessity of “deregulation”, discussions about deregulation vs regulation in Europe still seem to be characterized by a lack of…
Abstract
Purpose
Although policy makers strengthen the necessity of “deregulation”, discussions about deregulation vs regulation in Europe still seem to be characterized by a lack of sophistication and require a more differentiated picture of specific forms of deregulation. As a consequence, the analysis of new educational governance approaches should consider the local actor's interpretation of new roles and new responsibilities. Relating actions and reactions of school leaders to their formal environment should lead to more contextual patterns of responsiveness. The paper aims to discuss these issues.
Design/methodology/approach
The authors investigate, based on a survey among Cypriot school leaders, whether school autonomy needs deregulation, or regulation towards autonomy, respectively. At the time of research the school system of Cyprus could be characterized as a “centralized” system and hence represented a suitable field of study. Using a factor model followed by a cluster analysis the paper explores the school leaders’ profiles of operative and perceived autonomy in different fields of governance issues and identify different types of leadership.
Findings
The authors find that the autonomy school leaders experience is not necessarily related to a “defined” degree of autonomy which is prescribed by educational law and driven by concepts of new public management. Their “perceived” autonomy is also due to factors which can be located at a rather individual level.
Originality/value
The findings provide insight into principals’ motives to adopt certain styles of leading schools, quite independently from new measures of educational governance. The authors conclude that greater emphasis on systematic support programmes may prepare school principals for gains of autonomy as well as for potential sources of conflict.
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Martin Götz and Ernest H. O’Boyle
The overall goal of science is to build a valid and reliable body of knowledge about the functioning of the world and how applying that knowledge can change it. As personnel and…
Abstract
The overall goal of science is to build a valid and reliable body of knowledge about the functioning of the world and how applying that knowledge can change it. As personnel and human resources management researchers, we aim to contribute to the respective bodies of knowledge to provide both employers and employees with a workable foundation to help with those problems they are confronted with. However, what research on research has consistently demonstrated is that the scientific endeavor possesses existential issues including a substantial lack of (a) solid theory, (b) replicability, (c) reproducibility, (d) proper and generalizable samples, (e) sufficient quality control (i.e., peer review), (f) robust and trustworthy statistical results, (g) availability of research, and (h) sufficient practical implications. In this chapter, we first sing a song of sorrow regarding the current state of the social sciences in general and personnel and human resources management specifically. Then, we investigate potential grievances that might have led to it (i.e., questionable research practices, misplaced incentives), only to end with a verse of hope by outlining an avenue for betterment (i.e., open science and policy changes at multiple levels).
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Anton Stephan, Frank Holzäpfel and Stefan Zholtovski
This study aims to investigate the effect of gusts on aircraft wake vortices. Aircraft wake vortices present a potential risk to following aircraft, particularly during final…
Abstract
Purpose
This study aims to investigate the effect of gusts on aircraft wake vortices. Aircraft wake vortices present a potential risk to following aircraft, particularly during final approach and landing, as wake vortices may remain in the flight corridor for a long time. Wind and turbulence are key factors that influence the wake vortex evolution and the wake vortex generation in the aircraft. Flying through a gust influences the wake vortex roll-up process and its evolution. Note that vertical and lateral gusts may affect counter-rotating wake vortices differently. Both vortices influence each other by inducing a downward velocity. Disturbances may therefore lead to local vortex tilting and later to a complex three-dimensional deformation. This work uses two different hybrid Reynolds-averaged Navier–Stokes/large-eddy simulation (RANS-LES) approaches to investigate the effect of gusts on wake vortex evolution. In a one-way coupling, a pre-calculated RANS velocity field of the aircraft’s near-field is being swept through an LES domain. The effect of a sine gust on the turbulent wake is modeled by manipulating the RANS-field accordingly. As a more sophisticated approach, the concept of a two-way coupling is being presented. Here an LES solver is bi-directionally coupled with an unsteady RANS (URANS) solver, exchanging values at every physical time step of the simulation.
Design/methodology/approach
A one-way coupling approach of the LES code MGLET and the RANS code TAU is presented to simulate the gust effect on aircraft wake vortices. Additionally, the concept of the two-way coupling of these two codes incorporating a coupling module.
Findings
The gust effect of wake vortices subjected to a crosswind can be simulated. The vortex physics is analyzed. Unexpected behavior like fast upwind vortex decay is revealed.
Practical implications
The understanding of the aircraft wake vortex physics during landing provides valuable information for wake vortex advisory systems.
Originality/value
The effect of gust on wake vortices during and after landing has not been studied so far. The hybrid one-way coupling approach, as well as the concept of the two-way coupling, are relatively new.
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Susanne Böse and Stefan Brauckmann-Sajkiewicz
This study aims to explore the extent to which schools principals serving disadvantaged communities in Germany are able to set appropriate goals and choose suitable measures for…
Abstract
Purpose
This study aims to explore the extent to which schools principals serving disadvantaged communities in Germany are able to set appropriate goals and choose suitable measures for improving their schools according to the specific challenges they face. The authors determine whether principals are able to identify their schools' challenges or whether they merely follow “universal recipes” of the school effectiveness research paradigm regardless of their particular school context. This effectiveness-driven accountability approach requires an in-depth evaluation of the school and its stakeholders and might lead to a new attitude toward failure that sees it as an essential part of developing effective school improvement plans.
Design/methodology/approach
The authors conducted descriptive and correlative analyses as well as exploratory and confirmatory factor analyses using longitudinal data of 164 school principals. Through cross-sectional analyses, the authors investigated the connection among challenges, goals and measures and how they correlated with (self-reported) improvements.
Findings
From a leadership perspective, priorities for school improvement should be aligned with the school-specific challenges they identify and the goals they set to address them.
Research limitations/implications
The extent to which legislation concerning individual school quality development programs can translate into feasible and effective actions is unclear. Caution should be taken when interpreting the findings of this study, as they reflect school principals' self-selected evaluation measures and therefore might be biased.
Practical implications
In future research, emphasis should be placed on school management processes, in particular, the development of strategic decision-making, structuring of target perspectives and derivation of steps in school improvement and instructional development. The authors recommend the government offer school principals appropriate and adequate training and support services to prevent them from overburdening their staff.
Originality/value
This paper contributes to a deeper understanding of processes concerning strategic leadership, as opposed to operative management, of schools by revealing context-sensitive considerations.
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Rayan Faisal A. Makki and Stefan Van Hemmen
The purpose of this study is to investigate the initial investment's motivations and study the reinvesting motivations. The results revealed differences in reinvestors'…
Abstract
Purpose
The purpose of this study is to investigate the initial investment's motivations and study the reinvesting motivations. The results revealed differences in reinvestors' motivations of reinvestors in both winning and losing situations. Specifically, financial return and excitement motives were supported for win and loss situations, while recognition was supported for loss and pleasure in win situations.
Design/methodology/approach
The impact of intrinsic and extrinsic motivations on reinvestors was tested using the structural equation model. Furthermore, the framework was analysed with survey data from a total of 355 digital workers from Amazon Mechanical Turk, one of the world's largest crowdsourcing platforms.
Findings
The results indicate that there are differences in the motivations for reinvestors when they are in both winning and losing situations. Financial return and excitement motives were supported for win and loss situation, while recognition was supported in loss and pleasure in win situation.
Research limitations/implications
This study makes it possible to better understand the motivations behind crowdfunding reinvestment among digital workers. To build on this work, more studies should be conducted with different samples to test the generalisability of these results. Moreover, future studies on different samples could determine whether the same motivations would hold for other investors or whether another motivation would have greater impact on these reinvestment decisions.
Originality/value
While previous research on equity crowdfunding has predominantly focused on intrinsic and extrinsic motivations for participating and investing in equity crowdfunding platforms, the motives that specifically affect winning or losing situations for reinvestors have been largely overlooked.