An economical method of detecting and suppressing ringing artifacts during digital image resizing is presented. Prior to granting access to the network server, the network server authenticates the user by sending an authentication request to an authentication server. The high frequency component is processed by calculating an average current waveform of the high frequency component and approximating a corresponding RMS value using a waveform factor. The water separation plane provides a substantial barrier to moisture vapor and bulk water. The specific base station determines packet data to be retransmitted according to the receiving situation thereof for the upstream control signal returned from the terminal station and the receiving situations of the other base stations for the upstream control signal. Depending on their agonist or antagonist effect, the compounds are useful analgesics, immunosuppressants, antiinflammatory agents, agents for the treatment of neurological and psychiatric conditions, medicaments for drug and alcohol abuse, agents for treating gastritis and diarrhea, cardiovascular agents and agents for the treatment of respiratory diseases.