An improved catalyst for hydrodesulfurization of heavy feedstocks is disclosed. In one embodiment, a service requestor directly accesses a shared metrics array stored in at least one server of a plurality of servers in a service cluster. For example, in a Frame Relay -Asynchronous Transfer Mode interworked network, each FR and ATM site may be assigned both an FR Data Link Connection Identifier, as well as a Virtual Path Identifier andor a Virtual Channel Identifier, wherein the combination of identifiers assigned is unique for each site, regardless of whether the site is an ATM site or an FR site. The electrode sets respectively overlap different portions of the optical effect layer and are configured for sequentially starting affecting the different portions of the optical effect layer such that the optical effect layer appears to display a light-blocking section that moves in the moving direction and overlaps the transition region. In the equation, K is a coefficient and has a constant value predetermined in the range of 0K1.