Arif Rakhman Suharso,
1Faculty of of Teknologi Rekayasa Permesinan Kapal, Politeknik Maritim Negeri Indonesia, Jl. Pawiyatan Luhur I, Bendan Duwur, Gajahmungkur, Semarang City, Central Java 50233,
Indonesia
Ario Hendartono,
Faculty of of Teknologi Rekayasa Permesinan Kapal, Politeknik Maritim Negeri Indonesia, Jl. Pawiyatan Luhur I, Bendan Duwur, Gajahmungkur, Semarang City, Central Java 50233,
Indonesia
Slamet Supriyadi,
Universitas PGRI Semarang,
Indonesia
0240310
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