Before someone protests, the South Koreans are replacing the minefields with automated sentry guns, which are altogether nastier.
http://www.techeblog.com/index.php/tech-gadget/samsungs-200000-machine-gun-sentry-robot
Wha? Oh no, don't tell anyone.
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http://www.koreanwar.org/html/dmz_war.html
http://www.jstor.org/pss/120246
http://www.imjinscout.com/documents.php
http://31stinfantry.org/Documents/Chapter%2015.pdf
http://www.koreanwar-educator.org/topics/dmz/p_dmz_fighting_brush_fires.htm
Over the same period time, North Korea allegedly buried some 2,600 mines in the country's rural areas bordering South Korea...