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| Global Geology
2021 24 (1):
64-70
ISSN: 1673-9736: CN: 22-1371/P |
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| Analysis of effects of operating parameters on rate of penetration in drilling process with air down － the － hole hammer |
| HO Yinchol ,PAK Kumdol ,PENG Jianming,ＲI Jaemyong , KIM Yongnam and CHOE Cholho |
| 1． School of Information Science and Technology，Kim Chaek University of Technology，Pyongyang 999093，D． P． Ｒ． Korea; 2． School of Ｒesource Exploration Engineering，Kim Chaek University of Technology，Pyongyang 999093，D． P． Ｒ． Korea; 3． College of Construction Engineering，Jilin University，Changchun 130026，China |
| Received null Revised null Online 2021-02-25 |
| Reference null |
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| Corresponding author: |
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