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Full-Text Articles in Engineering
Analysis Of Compensation Techniques Applied To The Control Of Converter Connected Synchronous Wind Turbines And Dfig’S During Grid Disturbances., Joseph Kearney, Michael Conlon, Eugene Coyle
Analysis Of Compensation Techniques Applied To The Control Of Converter Connected Synchronous Wind Turbines And Dfig’S During Grid Disturbances., Joseph Kearney, Michael Conlon, Eugene Coyle
Conference papers
This paper investigates control schemes to improve the performance of converter connected synchronous generators and DFIG’s to grid voltage unbalance and grid faults. Both the synchronous generator with a full converter and a DFIG are modelled in Matlab/Simulink. The control schemes of both turbines are modified to improve their performance during grid disturbances including grid voltage unbalance and single-phase faults. These disturbances are introduced into the models at specific times to analyse the performance of the wind generation systems. The performances of both systems to the grid disturbances are compared and the results are analysed.
Diagnosis Of Breast Cancer By Optical Image Analysis, Salim J. Attia, Jonathan Blackledge, Ziad M. Abood, I. R. Agool
Diagnosis Of Breast Cancer By Optical Image Analysis, Salim J. Attia, Jonathan Blackledge, Ziad M. Abood, I. R. Agool
Conference papers
We consider the process of object detection, recognition and classification in digital optical images of human breast cells with the aim of differentiating between normal and abnormal (cancerous) cells. The work is based on research into the development of a breast cancer screening system that can be used by cytologists to differentiate between benign and malignant types using images that are typical of those currently interpreted by cytologists world-wide. The approach considered is based on feature vectors which are of two types. We consider statistical features such as the mode, median, mean, and standard deviation and features composed of Euclidian …
Surveying First-Year Students Prior Conceptual Understanding Of Direct Current Resistive Electric Circuits: An Update, Aidan O'Dwyer
Surveying First-Year Students Prior Conceptual Understanding Of Direct Current Resistive Electric Circuits: An Update, Aidan O'Dwyer
Conference papers
There is an increasing diversity of educational background of students entering Level 7 and Level 8 programmes in engineering in Irish third level education. Student reasoning about basic electricity concepts often differs from accepted explanations. The paper reports, analyses and reflects on the results of a multiple-choice diagnostic test to assess student understanding of such concepts (developed by Engelhardt and Beichner (2004) for U.S. high school and college students) taken by four cohorts of students, on the same DIT Level 7 engineering programme, from 2008-12 (n=106) and two cohorts of students, on the same DIT Level 8 engineering programme, from …
Shifted Nmf With Group Sparsity For Clustering Nmf Basis Functions, Rajesh Jaiswal, Derry Fitzgerald, Eugene Coyle, Scott Rickard
Shifted Nmf With Group Sparsity For Clustering Nmf Basis Functions, Rajesh Jaiswal, Derry Fitzgerald, Eugene Coyle, Scott Rickard
Conference papers
Recently, Non-negative Matrix Factorisation (NMF) has found application in separation of individual sound sources. NMF decomposes the spectrogram of an audio mixture into an additive parts based representation where the parts typically correspond to individual notes or chords. However, there is a need to cluster the NMF basis functions to their sources. Although, many attempts have been made to improve the clustering of the basis functions to sources, much research is still required in this area. Recently, Shifted Non-negative Matrix Factorisation (SNMF) was used to cluster these basis functions. To this end, we propose that the incorporation of group sparsity …