1,721,213 research outputs found
Load frequency controller design based on extreme learning machine
No full textThe loading of a power system is never constant. The actual load change of the power system cannot be predicted at any point in time. A load change in any are of the power system will result in a change in frequency of the power system. Frequency is a major stability criterion for large-scale multi area systems. To improve the stability of the power networks, it is necessary to design a load frequency control system. The designed controller must be able to cope with parametric uncertainties and nonlinearity of a real power system.
In this dissertation, a load frequency controller based on the Riccati-equation approach designed by the author’s supervisor Dr. Wang Youyi will be introduced. Only the bounds of the system parameters are required to design this controller. Simulation results show that the robust load frequency controller can ensure that the system is stable for all admissible uncertainties, even in the presence of generation rate constraint.
In the following part of the dissertation, it is proposed to use a neural network controller based on ELM (Extreme Learning Machine) algorithm instead of the robust load frequency controller. The performance data of the robust controller is set as the training pairs for the ELM neural-net load frequency controller. It aims to get a more adaptive control system for a larger parameters range. The performance of the ELM neural network load frequency controller is then compare with the original robust load frequency controller in Chapter 5 of this dissertation.Master of Science (Power Engineering
College English Teaching Reform Based on Intersubjectivity Teaching Model Yongxiang Wang, Youyi Zhu et al. & Hua Yang (Ed.) (2020). Soochow University Press, Soochow, 243 pages ISBN: 978-7-5672-3390-4
Full text linkWith the development of college English teaching reform in China, growing attention has been paid to the improvement of teaching materials and teaching methods. This book review introduces the monograph College English Teaching Reform Based on Intersubjectivity Teaching Model written by Yongxiang Wang, Youyi Zhu et al. from three aspects, namely content, strengths, and weaknesses. It is found that through the intersubjectivity teaching model, the model which breaks the limitation of the binary opposition approach and reflects Bakhtin’s Dialogue Theory, this monograph makes a profound reflection on modern college English teaching and puts forward instructive methods for English teaching, which makes significant contributions to the reform of college English teaching in China and are worth further promoting
College English Teaching Reform Based on Intersubjectivity Teaching Model Yongxiang Wang, Youyi Zhu et al. & Hua Yang (Ed.) (2020). Soochow University Press, Soochow, 243 pages ISBN: 978-7-5672-3390-4
No full textWith the development of college English teaching reform in China, growing attention has been paid to the improvement of teaching materials and teaching methods. This book review introduces the monograph College English Teaching Reform Based on Intersubjectivity Teaching Model written by Yongxiang Wang, Youyi Zhu et al. from three aspects, namely content, strengths, and weaknesses. It is found that through the intersubjectivity teaching model, the model which breaks the limitation of the binary opposition approach and reflects Bakhtin’s Dialogue Theory, this monograph makes a profound reflection on modern college English teaching and puts forward instructive methods for English teaching, which makes significant contributions to the reform of college English teaching in China and are worth further promoting
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Design of fixed-pitch variable speed wind turbine controller
No full textThis report intends to present the design procedure and simulation results obtained by the author in Final Year Project No. A1060-091: Design of Fixed-Pitch Variable Speed Wind Turbine Controller. The objective of the project is to design the control loop for the wind turbine conversion system so that we can get maximum power output. Firstly, since wind energy is the promising clean energy which may replace the traditional energy sources, a short introduction is given in Chapter 1.
Secondly, the author introduces the basic concept of the wind energy conversion system in Chapter 2. Spilt it into two parts (mechanical and electrical), each parts of the system is briefly described in this chapter
Thirdly, in Chapter 3, the control strategies used by the author is given. From the basic concept of the control scheme, the author makes his own designs of each controller used in the system. A novel control strategy of wind turbine MPPT implementation using a permanent magnet synchronous generator and a boost chopper circuit is presented in this chapter.
Finally, in Chapter 4, the author design all the blocks and models in the Simulation application based on the control concept developed above. The details of the control loop design is discussed and then from the simulation result, performance of the system is evaluate in Chapter 5.Bachelor of Engineerin
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
- …
