• FLOWER RESEARCH JOURNAL
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• v.18 no.4
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• pp.291-294
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• 2010

A new grafted cactus cultivar, G. mihanovichii 'Hwangun', for exporting abroad, was developed by crossing G. mihanovichii 'Hwangwol' variety with yellow and orange color, and G. mihanovichii '0111021' line with yellow color in 2008. It grew for 6 months after grafting in vitro and culturing at 100 mL test tube. After grafting and planting in greenhouse in 2005, various characteristics were evaluated three times until 2008. It has flat-round shape and bright yellow skin. In addition, it has 7 to 9 ribs and brown straight spines on the body. The diameter of it was 40.9 mm after 10 months after planting, and small comparing with G. mihanovichii 'Hukwang' cultivar. The ability of propagation in G. mihanovichii 'Hwangun' is prior to that of G. mihanovichii 'Hukwang' producing approximately 22.3 daughter globes for 10 months.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.47 no.8
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• pp.599-606
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• 2019

The pulse gun device is designed to identify the transverse pressure wave propagation/damping mechanism into the combustion flow field and in the combustion chamber according to the arrangement of multiple injectors. The manufactured pulse gun was tested to verify operability at the target combustion pressure and control of the pressure wave intensity. Gas nitrogen was used to pressurize the high-pressure tube and an OHP film of $100{\mu}m$ thickness was used for the diaphragm. To check the speed and intensity of the pressure waves, the dynamic and static pressure were measured using the pressure transducer. The performance test confirmed that the manufactured pulse gun can generate pressure waves with transverse characteristics that can be controled for strength depending on the supply pressure.