Piotr Chudzik

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The paper deals with the control strategy for the prototype AC tram drive designed for modernization of existing trams in Poland. The basis of the drive are vector-controlled induction motors sourced from voltage inverters. Motor shaft speed sensing enables torque and rotor flux indirect control in stator-current oriented co-ordinates system. In the paper(More)
The paper presents an innovative concept of applying a combination of well-known selective harmonic elimination (SHE) and selective harmonics mitigation (SHM) methods to shape a spectrum of catenary current harmonics, generated by a traction drive system equipped with a voltage source inverter. Application of this method allows for reducing distorting(More)
Diabetic retinopathy is characterised by morphological lesions related to disturbances in retinal blood flow. It has previously been shown that the early development of retinal lesions temporal to the fovea may predict the development of treatment-requiring diabetic maculopathy. The aim of this study was to map accurately the area where lesions could(More)
This paper introduces the use of fluid-dynamic modeling to determine the connectivity of overlapping venous and arterial vessels in fundus images. Analysis of the retinal vascular network may provide information related to systemic and local disorders. However, the automated identification of the vascular trees in retinal images is a challenging task due to(More)
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