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  By:Sakib Shabir   Memory:     A memory is the collection of storage units or devices together.The memory unit stores the binary information together in the form of bits. Generally, memory storage is classified into two categories 1.Volatile memory:This loses its data ,when power is switched off. 2.Non-Volatile:This is a permanent storage and does not loses any data when power is switched off.    Memory hierarchy: The total capacity of a computer can be visualised by hierarchy of components.The memory hierarchy system consists of all storage devices contained in a computer system from the slow Auxiliary memory to fast main memory and to the smaller cache memory.As we go from top to bottom speed and cost decreases but size increases. Memory hierarchy is nothing but various labels of memory Auxiliary memory access time is generally 1000 times that of  the main memory ,hence it is at the bottom of the hierarchy The main memory occupies the central position because it is equipped to co

By:Sakib Shabir   Computer graphics have played a significant role in the advance of medicine. Since the mid 1970's, when the first three-dimensional visualizations of Computed Tomography 1 were reported, computer graphics have evolved to aid the medical profession in various aspects such as diagnosis, procedures training, pre operative planning and telemedicine (McCloy & Stone, 2001). The use of computer graphics for medical diagnosis has provided an extraordinary ability to visualize, measure and evaluate structures in a non intrusive manner. One of the most important areas in medicine where computer graphics have had a positive impact is training. Computer graphics provide new methods for learning, as professionals can test their skills in simulators and evaluate their performance in a virtual environment. Whereas traditional training in the medical area involved a great number of dissections in order to correctly learn about the human anatomy, computer graphics have provide