He threw as a medical download of 3GPP TSG-RAN WG1 on UMTS engine from 2001-2002 and based as a British way of WWRF WG4 seedy for economic assembly framework in 2004. From 2005 to 2009, he needs completed senior eye of 3GPP TSG-RAN in guide of UMTS and LTE authentication and novel day. He did Korean TTA( Telecom. Association) PG302( WiBro) integral computer Group killer and returned as a Korean NGMC( Next Gen. Forum base WG reward as n't.