(2nd LD) N. Korean officials meet U.S. experts in Oslo
(ATTN: UPDATES with U.S. expert's career in 5th para, Norway's role in paras 8-13, Seoul's response to Kyodo report in last 5 paras; CHANGES dateline)
OSLO/SEOUL, May 9 (Yonhap) -- North Korean officials began informal talks with a group of American e