Ko, S. W., Jang, B. C., Koo, J. K. and Lee, T. S. (2009). "Study for korea lunar simulant
prototype development." Proceeding of the KSCE Korea Society of Civil Engineers, 10,
3598-3601 (in Korean).
Lee, J. H., Ann, K. Y., Lee, T. S. and Mitikie, B. B. (2018). "Bottom-up heating method
for producing polyethylene lunar concrete in lunar environment." Advances in Space
Research, Vol. 62, No. 1, pp. 164-173.
Lee, J. Y. and Lee, T. S. (2019). "Optimization of material extruding performance
to build a 3D printed habitat on the Moon and Mars." Journal of The Korean Society
of Civil Engineers, KSCE, 39(2), 345-349 (in Korean).
NASA and Bradley (2016). 3D-printed habitat challenge phase 2, Structural member competition
rules V.5, NASA & Bradley University, Available at: https://www.bradley.edu/sites/challenge-
phase2/documents/Competition_Rules.pdf (Accessed: January 28, 2020).
NASA and Bradley (2018). 3D-printed habitat challenge phase 3, On-Site Habitat Competition
Rules V.3, NASA & Bradley University, Available at : https://www.bradley.edu/sites/challenge/
assets/documents/3DPH_Phase_3_Rules-v3.pdf (Accessed: April 20, 2020)
Porter, M. (2017). Six teams earn honors, prize money in second construction level
of NASA challenge to 3-D print a habitat, NASA, Marshall Space Flight Center, Available
at: https://www. nasa.gov/directorates/spacetech/centennial_challenges/3DPHab/6-teams-earn-prize-money-in-second-level-of-challenge
(Accessed: November 20, 2019).
Porter, M. (2019). Teams 3D print planetary habitats, Awarded $700K in NASA Challenge,
Marshall Space Flight Center, Available at: https://www.nasa.gov/directorates/spacetech/centennial_
challenges/3DPHab/19-017.html (Accessed: January 12, 2020).
Prater, T., Roman, M., Kim, T. and Mueller, R. (2017). NASA centennial challenge:
3D-printed habitat, NASA.
Rogers, T. (2015). Everything you need to know about polyethylene (PE), Creative Mechanisms,
Available at: https://www.creativem echanisms.com/blog/polyethylene-pe-for-prototypes-3d-printing-and-cnc
(Accessed: January 12, 2020).
SpecialChem (2019). Shrinkage values (%) of various plastics, Omnexus, Available at:
https://omnexus.specialchem.com/polymer- properties/properties/shrinkage#PE-PL (Accessed:
January 12, 2020).
Standard, A. S. T. M. (2008). ASTM C109-standard test method for compressive strength
of hydraulic cement mortars, ASTM International, West Conshohocken, PA.
The Constructor (2019). Compressive strength of concrete - Cube test, procedure, results,
Available at: https://theconstructor.org/ concrete/compressive-strength-concrete-cube-test/1561/
(Accessed: November 20, 2019).