Embodiments of methods and systems for monitoring of pumps are provided. The laser diode driving circuit includes a voltage drop prevention unit, which prevents a voltage at an input terminal of the laser diode driving circuit from dropping to a predetermined voltage level or lower, the input terminal of the laser diode driving circuit being connected to an output terminal of the ALPC circuit. A market participant requests allocations of rights to certain issues and the request is filtered according to a value associated with the ranking of the selected issues. Following application of the cathode and anode layers, diffusion layers are prepared and inserted onto the catalyst coated membranes, and pressed to form membrane electrode assemblies.