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41.
In this paper, we present non-identical unsupervised clustering techniques for the segmentation of CT brain images. Prior
to segmentation, we enhance the visualization of the original image. Generally, for the presence of abnormal regions in the
brain images, we partition them into 3 segments, which are the abnormal regions itself, the cerebrospinal fluid (CSF) and
the brain matter. However, for the absence of abnormal regions in the brain images, the final segmented regions will consist
of CSF and brain matter only. Therefore, our system is divided into two stages of clustering. The initial clustering technique
is for the detection of the abnormal regions. The later clustering technique is for the segmentation of the CSF and brain
matter. The system has been tested with a number of real CT head images and has achieved satisfactory results. 相似文献
42.
Saravana Kumar Jaganathan Mohan Prasath Mani Praseetha Prabhakaran Eko Supriyanto Ahmad Fauzi Ismail 《International Journal of Polymer Analysis and Characterization》2019,24(5):457-474
Scaffolds used in skin tissue engineering must mimic the native function of the extracellular matrix (ECM) and facilitate the fibroblast cell response for new tissue growth. In this study, a novel dressing scaffold based on polyurethane (PU) with sesame oil, honey, and propolis was fabricated by electrospinning. Scanning electron microscopy (SEM) images showed that the diameter of the electrospun scaffolds decreased by blending sesame oil (784?±?125.46?nm) and sesame oil/honey/propolis (576?±?133.72?nm) into the PU matrix (890?±?116.911?nm). Fourier infrared (FT-IR) and thermogravimetric (TGA) analysis demonstrated the formation of hydrogen bonds and interaction between PU and sesame oil, honey, and propolis. Contact-angle measurement indicated reduced wettability of PU/sesame oil scaffold (114?±?1.732) and improved wettability (54.33?±?1.528) in the PU/sesame oil/honey/propolis scaffold. Further, tensile tests and atomic force microscopy (AFM) analysis indicated that the fabricated composite membrane exhibited enhanced mechanical strength and reduced surface roughness compared to the pristine PU. The developed composite displayed less toxicity to the red blood cells (RBC’s) compared to the pristine PU. Cytotoxicity assay showed enhanced cell viability of HDF in electrospun scaffolds than pristine PU after 72?h culture. These enhanced properties of the developed scaffolds suggest the potential of utilizing them in skin tissue engineering. 相似文献
43.
M. Zaini Jamaludin M. Khazani Abdullah Fairuz Abdullah A. Fauzi Abas M. Adzir Mahdi Faidz Rahman 《Optics & Laser Technology》2008,40(2):270-272
A new double-pass erbium-doped fiber amplifier (DP-EDFA) using chirped fiber Bragg grating (CFBG) is reported here showing a gain of 53.4 dB and noise figure (NF) of 5.36 dB. The proposed amplifier at the same time provides dispersion compensation through the use of CFBG. 相似文献