A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All
Malathi, G.
- Design and Implementation of Bridgeless SEPIC Rectifier for Power Factor Correction
Authors
1 Drives in Sethu Institute of Technology, Kariyapatti, IN
2 Department of M.E Power Electronics and Drives at Sethu Institute of Technology, Kariyapatti, IN
Source
Programmable Device Circuits and Systems, Vol 5, No 4 (2013), Pagination: 156-161Abstract
A Bridgeless SEPIC rectifier for power factor correction with low conduction losses and load regulation is proposed. The proposed SEPIC rectifier can achieve low conduction losses by provides two semiconductor switches at any time of conduction. This Sepic will act in DCM mode. The DCM operation gives additional advantages such as, zero-current turn-off; zero-current turn-on in the power switches in the output diode and reduces the complexity of the control circuitry .The output to input relation is controlled by PI controller. The proportional controller checks the error between actual and reference voltage. The integral controller will compensate this error by comparing the error with repeated sequence.DCM is preferred to produce almost unity power factor. At any time of voltage regulation line side power factor is maintained.
Keywords
Bridgeless Rectifier, Cuk Converter, Power Factor Correction (PFC), Rectifier, Sepic Converter.- Volume Estimation and Classification of Ultrasound Placenta Using Neural Network
Authors
1 Department of Computer Applications, Velammal Engineering College, Affiliated to Anna University, Chennai, IN
2 Department of Computer Applications, St. Joseph College of Engineering, Affiliated to Anna University, Chennai, IN
Source
Artificial Intelligent Systems and Machine Learning, Vol 3, No 2 (2011), Pagination: 90-95Abstract
Gestational Diabetes Mellitus is a condition in pregnant women that affects the normal fetal growth and complicates the development of placenta. This study uses the ultrasound placenta images to calculate the volume of placenta. The large placentas are normally indications of gestational diabetes mellitus. Evaluation of the volume of placenta during the routine ultrasound scan can identify placenta complicated by diabetes mellitus. Placental volume is calculated using the linear measurements of placental thickness, height and width using the concave-convex Hull formula. Based on these measurements the placenta can be classified as normal or abnormal placenta. The abnormal placenta is further classified into placenta complicated by Gestational Diabetes Mellitus and the placenta complicated by other reasons. The estimation of placental volume can identify the fetal risk in conditions of gestational diabetes mellitus. This would help to diagnose the complications at the earliest which would minimize the fetal loss, birth defects and placenta abruption.Keywords
Placenta, Ultrasound, Linear, Volume, Gestational Diabetes Mellitus, Thickness, Height, Width, Concave-Convex Hull, Haralick Features.- A Comparative Analysis on Image Quality Assessment for Real Time Satellite Images
Authors
1 School of Computing Science and Engineering, VIT University, Chennai - 600127, Tamil Nadu, IN