This open access book gives a systematic introduction into the spectral theory of differential operators on metric graphs. Main focus is on the fundamental relations between the spectrum and the ...geometry of the underlying graph. The book has two central themes: the trace formula and inverse problems. The trace formula is relating the spectrum to the set of periodic orbits and is comparable to the celebrated Selberg and Chazarain-Duistermaat-Guillemin-Melrose trace formulas. Unexpectedly this formula allows one to construct non-trivial crystalline measures and Fourier quasicrystals solving one of the long-standing problems in Fourier analysis. The remarkable story of this mathematical odyssey is presented in the first part of the book. To solve the inverse problem for Schrödinger operators on metric graphs the magnetic boundary control method is introduced. Spectral data depending on the magnetic flux allow one to solve the inverse problem in full generality, this means to reconstruct not only the potential on a given graph, but also the underlying graph itself and the vertex conditions. The book provides an excellent example of recent studies where the interplay between different fields like operator theory, algebraic geometry and number theory, leads to unexpected and sound mathematical results. The book is thought as a graduate course book where every chapter is suitable for a separate lecture and includes problems for home studies. Numerous illuminating examples make it easier to understand new concepts and develop the necessary intuition for further studies. ; Self-contained introduction to the theory of quantum graphs First time treatment of inverse problems in detail Numerous examples from physics included Open questions at the end of several chapters
This book explores the missing details of the linear parameter-varying (LPV) system theory that have hindered the formulation of a well established identification framework. It covers the key issues ...from system theory to modeling and identification.
Drift into Failure Dekker, Sidney
2011, 2016, 2016-12-05, 2011-02-01
eBook
What does the collapse of sub-prime lending have in common with a broken jackscrew in an airliner's tailplane? Or the oil spill disaster in the Gulf of Mexico with the burn-up of Space Shuttle ...Columbia? These were systems that drifted into failure. While pursuing success in a dynamic, complex environment with limited resources and multiple goal conflicts, a succession of small, everyday decisions eventually produced breakdowns on a massive scale. We have trouble grasping the complexity and normality that gives rise to such large events. We hunt for broken parts, fixable properties, people we can hold accountable. Our analyses of complex system breakdowns remain depressingly linear, depressingly componential - imprisoned in the space of ideas once defined by Newton and Descartes. The growth of complexity in society has outpaced our understanding of how complex systems work and fail. Our technologies have gotten ahead of our theories. We are able to build things - deep-sea oil rigs, jackscrews, collateralized debt obligations - whose properties we understand in isolation. But in competitive, regulated societies, their connections proliferate, their interactions and interdependencies multiply, their complexities mushroom. This book explores complexity theory and systems thinking to understand better how complex systems drift into failure. It studies sensitive dependence on initial conditions, unruly technology, tipping points, diversity - and finds that failure emerges opportunistically, non-randomly, from the very webs of relationships that breed success and that are supposed to protect organizations from disaster. It develops a vocabulary that allows us to harness complexity and find new ways of managing drift.
This monograph details basic concepts and tools fundamental for the analysis and synthesis of linear systems subject to actuator saturation and developments in recent research. The authors use a ...state-space approach and focus on stability analysis and the synthesis of stabilizing control laws in both local and global contexts. Different methods of modeling the saturation and behavior of the nonlinear closed-loop system are given special attention. Various kinds of Lyapunov functions are considered to present different stability conditions. Results arising from uncertain systems and treating performance in the presence of saturation are given. The text proposes methods and algorithms, based on the use of linear programming and linear matrix inequalities, for computing estimates of the basin of attraction and for designing control systems accounting for the control bounds and the possibility of saturation. They can be easily implemented with mathematical software packages.
Advancing Theory with Review Articles Post, Corinne; Sarala, Riikka; Gatrell, Caroline ...
Journal of management studies,
March 2020, 2020-03-00, 20200301, Letnik:
57, Številka:
2
Journal Article
Recenzirano
Reviewing a body of work presents unique opportunities for making a theoretical contribution. Review articles can make readers think theoretically differently about a given field or phenomenon. Yet, ...review articles that advance theory have been historically under‐represented in Journal of Management Studies. Accordingly, the purpose of this editorial is to propose a multi‐faceted approach for fashioning theoretical contributions in review articles, which we hope will inspire more authors to develop and submit innovative, original, and high‐quality theory‐building review articles. We argue that advancing theory with review articles requires an integrative and generative approach. We propose a non‐exhaustive set of avenues for developing theory with a review article: exposing emerging perspectives, analysing assumptions, clarifying constructs, establishing boundary conditions, testing new theory, theorizing with systems theory, and theorizing with mechanisms. As a journal, Journal of Management Studies is a journal of ideas – new ideas; ideas drawn from reflections on extant theory and ideas with potential to change the way we understand and interpret theory. With this in mind, we think that advancing theory with review articles is an untapped source of new ideas.
Industry 4.0 promises the fourth industrial revolution by integration of cyber and physical worlds through technology. Industry 4.0 implementation will result in human interaction with technical ...system in a specialised manner. Therefore, Industry 4.0 will also be a socio (human related) and technical (nonhuman related) system in pursuit of a common goal. The purpose of this study is to suggest a mechanism to include Socio-Technical Systems Theory perspective while designing architecture for integration while implementing Industry 4.0. Building on the previous literatures on Socio-Technical Systems Theory and Industry 4.0, the article proposes bringing the two approaches together and presents a framework for integration mechanism. Successful implementation of Industry 4.0 warrants vertical, horizontal and end-to-end integration. This study suggests a design mechanism for three types of integration mechanism in Industry 4.0 by considering the socio-technical systems impact on people, infrastructure, technology, processes, culture and goals. Further, the integration is also suggested for analysis on the impact of stakeholders, economic situation and regulatory frameworks around which the operating organizations are operating. This is the first paper to propose the consideration of Socio-Technical Systems theory while designing the horizontal, vertical and end-to-end integration for sustainable implementation of Industry 4.0.
•Successful implementation of Industry 4.0 warrants vertical, horizontal and end-to-end integration.•Study suggests a design mechanism for Industry 4.0 by considering the socio-technical systems.•Study also suggests an analysis on the impact of stakeholders, economic situation and regulatory frameworks.
The Sociology of Refugee Migration FitzGerald, David Scott; Arar, Rawan
Annual review of sociology,
07/2018, Letnik:
44, Številka:
1
Journal Article
Recenzirano
Odprti dostop
Theorization in the sociology of migration and the field of refugee studies has been retarded by a path-dependent division that we argue should be broken down by greater mutual engagement. Excavating ...the construction of the refugee category reveals how unwarranted assumptions shape contemporary disputes about the scale of refugee crises, appropriate policy responses, and suitable research tools. Empirical studies of how violence interacts with economic and other factors shaping mobility offer lessons for both fields. Adapting existing theories that may not appear immediately applicable, such as household economy approaches, helps explain refugees' decision-making processes. At a macro level, world systems theory sheds light on the interactive policies around refugees across states of origin, mass hosting, asylum, transit, and resettlement. Finally, focusing on the integration of refugees in the Global South reveals a pattern that poses major challenges to theories of assimilation and citizenship developed in settler states of the Global North.
Organizations are dynamic, hierarchically structured entities. Such dynamism is reflected in the emergence of significant events at every organizational level. Despite this fact, there has been ...relatively little discussion about how events become meaningful and come to impact organizations across space and time. We address this gap by developing event system theory, which suggests that events become salient when they are novel, disruptive, and critical (reflecting an event's strength). Importantly, events can originate at any hierarchical level and their effects can remain within that level or travel up or down throughout the organization, changing or creating new behaviors, features, and events. This impact can extend over time as events vary in duration and timing or as event strength evolves. Event system theory provides a needed shift in focus for organizational theory and research by developing specific propositions articulating the interplay among event strength and the spatial and temporal processes through which events come to influence organizations.
