https://www.jce.ne.jp/case_studies/coal_coke_transportation_1/ weekly 0.8 https://www.jce.ne.jp/case_studies/soil_shipping_1/ weekly 0.8 https://www.jce.ne.jp/case_studies/large_shipping_1/ weekly 0.8 https://www.jce.ne.jp/case_studies/coal_coke_transportation_2/ weekly 0.8 https://www.jce.ne.jp/case_studies/soil_shipping_2/ weekly 0.8 https://www.jce.ne.jp/case_studies/barge_1/ weekly 0.8 https://www.jce.ne.jp/case_studies/barge_2/ weekly 0.8 https://www.jce.ne.jp/case_studies/barge_3/ weekly 0.8 https://www.jce.ne.jp/case_studies/link_1/ weekly 0.8 https://www.jce.ne.jp/case_studies/link_2/ weekly 0.8 https://www.jce.ne.jp/case_studies/barge_4/ weekly 0.8 https://www.jce.ne.jp/case_studies/gravel_stone_transportation_1/ weekly 0.8 https://www.jce.ne.jp/case_studies/gravel_stone_transportation_2/ weekly 0.8