A New Fuzzy Stabilizer Based on Online Learning Algorithm for Damping of Low-Frequency Oscillations

A multi objective Honey Bee Mating Optimization (HBMO) designed by online learning mechanism is proposed in this paper to optimize the double Fuzzy-Lead-Lag (FLL) stabilizer parameters in order to improve low-frequency oscillations in a multi machine power system. The proposed double FLL stabilizer consists of a low pass filter and two fuzzy logic controllers whose parameters can be set by the proposed multi objective optimization process. A multilayer adaptive network is employed to design the fuzzy logic controller with self-learning capability that does not require another controller to tune the fuzzy inference rules and membership functions. In the proposed online learning algorithm, two artificial neural networks are employed which this system makes the FLL stabilizer adaptive to changes in the operating conditions. Therefore, variation in the power system response, under a wide range of operating conditions, is less compared to the system response with a fixed-parameter conventional controller. The effectiveness of the proposed stabilizer has been employed by simulation studies. The effectiveness of the proposed stabilizer is demonstrated on Two-Area Four-Machine (TAFM) power system under different loading conditions

Evolutionary Computation

This book presents several recent advances on Evolutionary Computation, specially evolution-based optimization methods and hybrid algorithms for several applications, from optimization and learning to pattern recognition and bioinformatics. This book also presents new algorithms based on several analogies and metafores, where one of them is based on philosophy, specifically on the philosophy of praxis and dialectics. In this book it is also presented interesting applications on bioinformatics, specially the use of particle swarms to discover gene expression patterns in DNA microarrays. Therefore, this book features representative work on the field of evolutionary computation and applied sciences. The intended audience is graduate, undergraduate, researchers, and anyone who wishes to become familiar with the latest research work on this field

Novel particle swarm optimization algorithms with applications in power systems

This thesis was submitted for the award of Doctor of Philosophy and was awarded by Brunel University LondonOptimization problems are vital in physical sciences, commercial and finance matters. In a nutshell, almost everyone is the stake-holder in certain optimization problems aiming at minimizing the cost of production and losses of system, and also maximizing the profit. In control systems, the optimal configuration problems are essential that have been solved by various newly developed methods. The literature is exhaustively explored for an appropriate optimization method to solve such kind of problems. Particle Swarm Optimization is found to be one of the best among several optimization methods by analysing the experimental results. Two novel PSO variants are introduced in this thesis. The first one is named as N State Markov Jumping Particle Swarm Optimization, which is based on the stochastic technique and Markov chain in updating the particle velocity. We have named the second variant as N State Switching Particle Swarm Optimization, which is based on the evolutionary factor information for updating the velocity. The proposed algorithms are then applied to some widely used mathematical benchmark functions. The statistical results of 30 independent trails illustrate the robustness and accuracy of the proposed algorithms for most of the benchmark functions. The better results in terms of mean minimum evaluation errors and the shortest computation time are illustrated. In order to verify the satisfactory performance and robustness of the proposed algorithms, we have further formulated some basic applications in power system operations. The first application is about the static Economic Load Dispatch and the second application is on the Dynamic Economic Load Dispatch. These are highly complex and non-linear problems of power system operations consisting of various systems and generator constraints. Basically, in the static Economic Load Dispatch, a single load is considered for calculating the cost function. In contrast, the Dynamic Economic Load Dispatch changes the load demand for the cost function dynamically with time. In such a challenging and complex environment the proposed algorithms can be applied. The empirical results obtained by applying both of the proposed methods have substantiated their adaptability and robustness into the real-world environment. It is shown in the numerical results that the proposed algorithms are robust and accurate as compared to the other algorithms. The proposed algorithms have produced consistent best values for their objectives, where satisfying all constraints with zero penalty

Programmable sphere-tubule frameworks through supramolecular and supracolloidal assembly pathways

The dissertation focuses on the study of a series of new supracolloidal frameworks which can be specifically programmed by the use of tailored supramolecular bile salt derivatives (BSDs) anisotropic structures in combination with isotropic polymeric particles, without resorting to auxiliary functionalization of none the two species. With their high tunability and high repetibility these programmable frameworks could be seen as an innovative pathway for mere nanomaterial preparation and for a deeper understanding of supracolloidal interaction mechanisms among different colloidal units. Three important features can be remarked: 1. The innovative use of anisotropic supramolecular building blocks working as versatile tools for supracolloidal assemblies preparation: the introduction of these mixed systems, based on elementary units composed from isotropic and anisotropic particles, allows to bypass the state of the art constrain given, among the other things, by the need to induce the anisotropy of interaction with satellite chemical functionalizations on the particle surface, particularly influencing the range of geometries accessible and the preparation complexity. 2. The possibility to program the specific framework desired, choosing among a wide range of BSDs with an achieved and solid know-how of their self-assembly behavior and structural characteristics. 3. The possibility to have as outcome intriguing systems in a wide range of configurations possible: from core-corona assemblies to chirally (or non-chirally) decorated supramolecular tubules, from highly ordered frameworks with lattice properties to well-defined crystalline domains in a gel matrix

Abstracts on Radio Direction Finding (1899 - 1995)

The files on this record represent the various databases that originally composed the CD-ROM issue of "Abstracts on Radio Direction Finding" database, which is now part of the Dudley Knox Library's Abstracts and Selected Full Text Documents on Radio Direction Finding (1899 - 1995) Collection. (See Calhoun record https://calhoun.nps.edu/handle/10945/57364 for further information on this collection and the bibliography). Due to issues of technological obsolescence preventing current and future audiences from accessing the bibliography, DKL exported and converted into the three files on this record the various databases contained in the CD-ROM. The contents of these files are: 1) RDFA_CompleteBibliography_xls.zip [RDFA_CompleteBibliography.xls: Metadata for the complete bibliography, in Excel 97-2003 Workbook format; RDFA_Glossary.xls: Glossary of terms, in Excel 97-2003 Workbookformat; RDFA_Biographies.xls: Biographies of leading figures, in Excel 97-2003 Workbook format]; 2) RDFA_CompleteBibliography_csv.zip [RDFA_CompleteBibliography.TXT: Metadata for the complete bibliography, in CSV format; RDFA_Glossary.TXT: Glossary of terms, in CSV format; RDFA_Biographies.TXT: Biographies of leading figures, in CSV format]; 3) RDFA_CompleteBibliography.pdf: A human readable display of the bibliographic data, as a means of double-checking any possible deviations due to conversion

Inclusive adventure by design: The development of opportunities in outdoor sport for disabled people through co-ordinated people centred research and development in design and coaching

This thesis was submitted for the degree of Doctor of Philosophy and awarded by Brunel University.Structured to help readers from a range of disciplines, the thesis looks at the creation of opportunities for participation in adventure sport, specifically the development of a postural support for intermediate level performers with spinal cord injury in sea kayaking. The research has shown that it is possible to increase the performance level of disabled athletes in paddle sport through the development of appropriate adaptive equipment, which in turn promotes inclusion and the broadening of opportunities. This research project takes place against a backdrop of national events and developments; notably, changes in UK legislation to do with disability access (DDA 1995), and developments in legislation to do with outdoor safety. The research also takes place against a backdrop of national campaigns, such as the ‘Campaign for Adventure’, and an increasing number of drives to make the UK’s population more active. The broad-based multidisciplinary approach is in line with reported priorities in international disability sport research, while encompassing paddlesport specific criteria. The research takes the approach of design research to develop the product. Initially the reported studies evaluate the design process utilising desk-based research. They then proceed to utilise design methodology in field-based short and longer expedition settings. The design process utilises existing user-centred staged design approaches to explore methods for wider application. The findings reveal that the development of opportunities in adventure sport with disabled people involves engaging with a social mess. The action of problem definition and resolution can be termed in this paradigm as a wicked problem, being that is does not have one clear solution. The information needing to be exchanged in the problem resolution can be considered as sticky, being that the research process takes place in a specialised arena characterised by sparse resources and with a multidisciplinary team. The research has informed the creation of twelve tools to support those practitioners involved in this area. Used from the bottom up or top down, they provide a common language between the participant, coach, therapist and researcher to help educate and inspire each person to understand the true nature of the problem, improve the shared understanding within the team, and thereby reducing the stickiness of the information. The effect on the development of new equipment is to improve focus and user participation, so making it easier to work within the social mess. A new postural support was designed for use by intermediate level sea kayakers with spinal cord injury, the design of which is given in study 9, which is evaluated in study 10. The study suggests that future work in this area should focus on the coordination of sport science support, further exploration of the link between design research and social change, explore the validity of the tools across a broader population, and further develop the design so that the new equipment can be of benefit to the broader population