A novel on-line method is presented for the extraction and preconcentration of amino acids using a sol-gel coated column coupled to a conventional UVvis detector. In one particular exemplary embodiment, the techniques may be realized as a system for predicting and protecting spearphishing targets. The polymer layer has a thickness from about 5 \u03bcm to about 200 \u03bcm, surface resistivity from about 1E08 to about 1E12 Ohmcm and breakdown strength greater than 500 V. Thus it realizes the impulse noise rejection circuit small in circuitry and small in the number of parts, and the satellite communications terminal using the same. During actuation, when the housing is deformed the retainer and the filter move to abut the top plate of the diffuser shell, combustion gas passes through the filter and the gas passage to be discharged from the gas discharge port. The computer also renders a graphical representation of a transmission path of the network flow within the network device from the ingress interface.