An embodiment of the invention provides a method for effective memory clustering to minimize page faults and optimize memory utilization. The 3-D image signal processing apparatus converts a multi-visual-point 2-D image signal into a signal suited to a 3-dimensional image display apparatus. The second tube may be substantially concentric with the core tube. This control circuit is inserted between the main circuit and at least one of two power supply units. Methods for selectively targeting pharmaceutical agents to desired tissues are provided. A connection member is attached to the inner layer.