score_timezone() function in src/timezone/pgtz.c has some problems.
At "if (strcmp(TZABBREV(cbuf), pgtm->tm_zone) != 0)",
cbuf (timezone name of systm) is not same pgtm->tm_zone in Korean OS.
timezone name of system is "대한민국 표준시",
timezone name of pgtm is "KST"
we need maybe a matching table contained localizational timezone name and pg time zone name.
