Provided is a shield terminal connection structure and method, which are easy and simple, for connecting a terminal part of a tubular shielding member to a shield structure. The neuron and method further include receiving a main input signal and forming, based on the main signal and the non-linear signal, the function S OR V, which is used to generate a main output signal, and at lest one of three logical functions S AND V, NOT S AND V, and S AND NOT V. Demonstration of negative refraction of visible light is also performed for the grism. A method for stationkeeping of a free-flying tethered airship system is also provided.