Abstract: A component composing apparatus using virtual components in component-based robot software development, includes a component repository configured to store a plurality of components having at least one port; and an application diagram generation unit configured to create an application diagram by selecting the components stored in the component repository. Further, the component composing apparatus includes an information repository configured to store the components within the application diagram and port information of the components within the application diagram and port connection information between the components within the application diagram; and a virtual component processing unit configured to create the virtual components for components selected by a user among the components within the application diagram.

Abstract: A medium feeding apparatus comprises a driving motor for moving a backup plate to press a medium against a pickup roller, piezoelectric elements for sensing slippage between the pickup roller and the medium which occurs while the roller rotates, and a controller for driving the driving motor to thereby vary a force for pressing the medium against the pickup roller, when the sensing means has sensed slippage between the pickup roller and the medium.