R. C. S. Machado

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— Segmentation of brain tumor manually consumes more time and it is a challenging task. This paper detects the tumor inside the brain by doing segmentation and extraction of the tumor which is been detected. To prove the efficiency of the detection of brain tumor we have performed a comparative study of two segmentation algorithms namely " watershed(More)
The class of unichord-free graphs was recently investigated in the context of vertex-colouring (Trotignon and Vušković in J Graph Theory 63(1): 31–67, 2010), edge-colouring (Machado et al. in Theor Comput Sci 411(7–9): 1221–1234, 2010) and total-colouring (Machado and de Figueiredo in Discrete Appl Math 159(16): 1851–1864, 2011). Unichord-free graphs proved(More)
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