Data Warehouses are used to maintain and manage the historical information. Data Warehouses contains the sensitive information such as financial records, customer's values etc. That information is considered to be very important and private. Therefore, it is necessary to secure the data from unauthorized accesses. Considering the importance of data security many data security models have been introduced in past years. Security models are used to implement data security from the early stages of Data Warehouse. These models are not suitable for existing Data Warehouses. Also, these models have...

Faditron is a mechanical machine that is able to climb on walls (concrete and glass) of a building. The major applications in which this project deals are surveillance, inspection of bridges and buildings, window cleaning of the skyscrapers. The design is simple and supports all the above mentioned categories and is especially good for window cleaning purposes as the suction mechanism is very similar to vacuum cleaner's dirt sucking mechanism.