https://mobigist.com/academic/transportation/%eb%8f%84%eb%a1%9c%c2%b7%ec%b2%a0%eb%8f%84%eb%b6%80%eb%ac%b8-%ec%82%ac%ec%97%85%ec%9d%98-%ea%b2%bd%ec%a0%9c%ec%84%b1-%eb%b6%84%ec%84%9d%eb%b2%95/ 2026-06-16T23:42:12+09:00 Mobigist en 2026-06-16T22:03:38+09:00 도로·철도부문 사업의 경제성 분석법 https://mobigist.com/academic/transportation/%ea%b5%90%ed%86%b5%eb%a5%98-%ec%a3%bc%ec%9a%94-%eb%aa%a8%ed%98%95greenshields-greenberg-underwood/ 2026-06-16T20:18:52+09:00 Mobigist en 2026-06-16T19:42:29+09:00 교통류 주요 모형(Greenshields, Greenberg, Underwood)