A refueling drogue adapted to connect to a refueling hose extending from a refueling aircraft. The self-aligned trench DMOS transistor structure as described is fabricated by using only one masking photoresist step and can be easily scaled down to obtain a high-density trench DMOS power transistor with ultra low on-resistance, low gate-interconnection parasitic resistance, and high device ruggedness. is prevented effectively and the long-term use has been made possible. When designing an LDPC code, this approach is efficient to find and avoid cycles in the LDPC code’s corresponding bipartite graph. The data collection module for collecting and transmitting data to a remote performance unit. The method of the present invention produces optical components having substantially no striae.