Hitomi Tamura Yutaka Yahiro Yutaka Fukuda Kenji Kawahara Yuji Oie Performance Analysis of Energy Saving Scheme with Extra Active Period for LAN Switches. 198-203 2007 GLOBECOM http://dx.doi.org/10.1109/GLOCOM.2007.45 conf/globecom/2007 db/conf/globecom/globecom2007.html#TamuraYFKO07