Melanoma is a perfidious form of skin cancer.The study offers a hybrid framework for the automatic classification of melanoma.An Auto-matic Melanoma Detection System(AMDS)is used for identifying melanoma from the infe...Melanoma is a perfidious form of skin cancer.The study offers a hybrid framework for the automatic classification of melanoma.An Auto-matic Melanoma Detection System(AMDS)is used for identifying melanoma from the infected area of the skin image using image processing techniques.A larger number of pre-existing automatic melanoma detection systems are either commercial or their accuracy can be further improved.The research problem is to identify the best preprocessing technique,feature extractor,and classifier for melanoma detection using publically available MED-NODE data set.AMDS goes through four stages.The preprocessing stage is for noise removal;the segmentation stage is for extracting lesions from infected skin images;the feature extraction stage is for determining the features like asymmetry,border,and color,and the classification stage is to classify the lesion as benign or melanoma.The infected input image for the AMDS may contain impurities such as noise,illumination,artifacts,and hairs.In the proposed methodology an algorithm LePrePro is proposed for the prepro-cessing stage for denoising and brightness cum contrast normalization and another algorithm LeFET is proposed for extending the feature vector space in the feature extraction stage using a hybrid approach.In the study,a novel approach has been proposed in which different classifiers,feature extractions,and data preprocessing steps of the AMDS are compared.In a conclusion,this comparison revealed that on experimentation using Med-Node and ISIC 2017 Dataset,the best results included Gaussian blur as the best data preprocessing step,Extended feature vector which is the combination of Hue Saturation Value(HSV),and Local Binary Pattern(LBP)was the best feature extraction method,and the ensemble bagged tree was the best classification technique on the Med-Node data sets with 99%Area Under the Receiver Operating Characteristic Curve(AUC),93.52%accuracy,90.82%sensitivity,and 98.36%specificity in the proposed automatic melanoma detection system.展开更多
The dynamics of fluid contained in a nano-cube has been studied by proposing theoretical model which is based on the microscopic consideration.The confinement affecting the movement at atomic level has been used to st...The dynamics of fluid contained in a nano-cube has been studied by proposing theoretical model which is based on the microscopic consideration.The confinement affecting the movement at atomic level has been used to study the self-diffusion through Green Kubo relation.It is found that close to the walls,the dynamics of fluid slows down to an extent that it affects the flow of fluid even in the middle of the nanocube.Results are contrasted with the results obtained from similar considerations for fluid confined in rectangular nanotube.It is found that tendency of freezing near the wall is more in case of nanocube than in the rectangular nanotube.An empirical relation has also been proposed to explain the behaviour of wall mediated self-diffusion as a function of distance in either direction.展开更多
文摘Melanoma is a perfidious form of skin cancer.The study offers a hybrid framework for the automatic classification of melanoma.An Auto-matic Melanoma Detection System(AMDS)is used for identifying melanoma from the infected area of the skin image using image processing techniques.A larger number of pre-existing automatic melanoma detection systems are either commercial or their accuracy can be further improved.The research problem is to identify the best preprocessing technique,feature extractor,and classifier for melanoma detection using publically available MED-NODE data set.AMDS goes through four stages.The preprocessing stage is for noise removal;the segmentation stage is for extracting lesions from infected skin images;the feature extraction stage is for determining the features like asymmetry,border,and color,and the classification stage is to classify the lesion as benign or melanoma.The infected input image for the AMDS may contain impurities such as noise,illumination,artifacts,and hairs.In the proposed methodology an algorithm LePrePro is proposed for the prepro-cessing stage for denoising and brightness cum contrast normalization and another algorithm LeFET is proposed for extending the feature vector space in the feature extraction stage using a hybrid approach.In the study,a novel approach has been proposed in which different classifiers,feature extractions,and data preprocessing steps of the AMDS are compared.In a conclusion,this comparison revealed that on experimentation using Med-Node and ISIC 2017 Dataset,the best results included Gaussian blur as the best data preprocessing step,Extended feature vector which is the combination of Hue Saturation Value(HSV),and Local Binary Pattern(LBP)was the best feature extraction method,and the ensemble bagged tree was the best classification technique on the Med-Node data sets with 99%Area Under the Receiver Operating Characteristic Curve(AUC),93.52%accuracy,90.82%sensitivity,and 98.36%specificity in the proposed automatic melanoma detection system.
文摘The dynamics of fluid contained in a nano-cube has been studied by proposing theoretical model which is based on the microscopic consideration.The confinement affecting the movement at atomic level has been used to study the self-diffusion through Green Kubo relation.It is found that close to the walls,the dynamics of fluid slows down to an extent that it affects the flow of fluid even in the middle of the nanocube.Results are contrasted with the results obtained from similar considerations for fluid confined in rectangular nanotube.It is found that tendency of freezing near the wall is more in case of nanocube than in the rectangular nanotube.An empirical relation has also been proposed to explain the behaviour of wall mediated self-diffusion as a function of distance in either direction.
