BUKU ABSTRAK - Universiti Putra Malaysia

Science, Technology & Engineering
Fast Hybrid Image Processing based on Graphic Processing Unit
Dr. Khairulmizam Samsudin
Afsaneh Jalalian, Syamsiah Mashohor and M. Iqbal Saripan
Faculty of Engineering, University Putra Malaysia,
43400 UPM Serdang, Selangor, Malaysia.
+603-8946 4320; kmbs@eng.upm.edu.my
In the last few years, Graphics Processing Units (GPUs) have evolved into more flexible and powerful
parallel data processors. GPUs are economical and are advantageous in a wide variety of computer architecture.
The parallelism feature of Cellular Automata (CA) is well-suited to run on parallel processors and therefore, can
be employed on graphical processing units (GPUs). This research presents a hybrid CA model for edge detection
in image distorted by salt and pepper noise. In order to enhance the performance of the CA model, we adopt
GPU based processing approach. The proposed CA model is able to extract edge in high intensity noise image
compared to other conventional method. The implementation of the CA model based on GPU has significantly
improved the performance of the edge detection in the presence of noise.
Keywords: Graphic processing unit, cellular automata, noise filtering, edge detection
Investigation of Switching Duration for 3-Level Neutral-Point-Clamped Inverter
Dr. Nashiren Farzilah Mailah
Senan Mahmod Abdullah and Norhisam Misron
Faculty of Engineering, University Putra Malaysia,
43400 UPM Serdang, Selangor, Malaysia.
+603-8946 6316; nashiren@eng.upm.edu.my
Neutral-Point-Clamped (NPC) inverter is one type of the multilevel inverters that has the advantages of
lower output distortion, lower dv/dt stresses on each individual power switches and lower switching losses, when
compared to the conventional 3-phase bridge inverter. Multilevel inverter operation is based on the concept of
increasing the staircase level of output voltage waveform by steadily switching the power switches in small
voltage steps. Each increment of level of the multilevel inverter involves an additional of two power switches at
each leg. This study investigates the effect of switching duration of the triggering signals to the 3-phase, 3-level
Neutral-Point-Clamped inverter. By varying the switching duration of the triggering signals, the Total Harmonics
Distortion (THD) value of voltage and current outputs of the inverter will be affected. From the investigation,
the relationship between the switching duration and the output voltage and current can be found. Thus, the best
switching duration can be used to obtain output with the lowest THD value. This low THD output waveform
can help in minimizing the harmonics distortion when the inverter is being used as a Static Synchronous Series
Compensator (SSSC) in power system network. Simulation model of the NPC inverter has been designed and
developed using Matlab/Simulink software.
Keywords: Switching duration, Neutral-Point-Clamped, total harmonics distortion (THD)
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