| Lee and An(2022) | Infrastructure that provides social, ecological and economic benefits to humans by preserving and utilizing the values and functions of natural ecosystems to the fullest extent |
| Kwon and Kim(2019) | Urban spatial elements that can promote the life and quality of life by utilizing natural elements of nature |
| Lee et al.(2018) | Defined as a green network system that provides economic, social, and ecological benefits to humans |
| Kim and Zoh(2015) | A network of interconnected green spaces that benefit humans with the values and functions of natural ecosystems |
| Kang(2012) | It is a concept of environmental policy including natural and artificial resources such as green space and defined as a landscape network for improving ecological value |
| Cho(2010) | Infrastructure that creates regional economic production and cultural and environmental values beyond the concept of passive activities such as preservation and restoration |