• developed and controlled program with Ethernet and RS-232C communication on UNIX and Linux environment since 1992
• developed UNIX and Linux Shell, awk, perl, PHP program since 1992
• installed and configured Oracle Database 8i/9i/10g/11g/12c and PL/SQL, C, C++ program since 1995
• installed Oracle Database Grid, RAC, ASM, Advanced Replication, Stream and Advanced Queue, Gateway, Backup and Recovery and so on
• installed and developed on Oracle Application Express 3/4/5
• installed Apache and MySQL since 2001
• installed and controlled SunOS/Solaris on SUN SPARC(SPARC Station/Server) and Intel x86 since 1994
• installed and controlled large scale Cisco switch and router since 2001
• installed and configured Linux(Fedora, SUSE, CentOS, Oracle Linux and so on) since 1998
• developed and configured embedded Linux and Apache on Nokia/Blackberry /iPhone/Android since 2006