TY JOUR TI On reducing the CPU time for simulating of railway automation and remote control systems circuit diagrams in NGSPICE environment KW CUSPICE KW Spice KW circuit simulation KW Ngspice algorithm KW CPU time KW Newton-Raphson method KW node admittance matrix KW CUSPICE JO Transport automation research AU Novikov, D.V. PY 2015 IS 1 PB FSBEI HE "Emperor Alexander I St. Petersburg State Transport University"