• Proceedings of the Korean Ceranic Society Conference
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• 2004.10a
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• pp.90.1-90.1
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• 2004

• Proceedings of the Korean Society of Environment and Ecology Conference
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• 2004.04a
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• pp.132-135
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• 2004

• Magazine of the Korea Concrete Institute
• /
• v.28 no.1
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• pp.36-40
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• 2016

• Proceedings of the Korean Society of Life Science Conference
• /
• 2006.09a
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• pp.74.1-74.1
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• 2006

• Proceedings of the PSK Conference
• /
• 2002.04a
• /
• pp.160.1-160.1
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• 2002

• Journal for History of Mathematics
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• v.27 no.2
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• pp.111-125
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• 2014

Jisuguimundo is an inimitable magic hexagon devised by Choi Seok-Jeong, who was the author of GuSuRyak as well as a prime minister in Joseon dynasty. Jisuguimundo, recorded in GuSuRyak, is also known as Hexagonal Tortoise Problem (HTP) because its nine hexagons resemble a tortoise shell. We call the sum of numbers in a hexagon in Jisuguimundo a magic sum, and show that the magic sum of hexagonal tortoise problem of order 2 varies 40 through 62 exactly and that of hexagonal tortoise problem of order 3 varies 77 through 109 exactly. We also find all of the possible solutions for hexagonal tortoise problem of oder 2.

• Proceedings of the Korean Society of Coastal and Ocean Engineers Conference
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• 2008.09a
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• pp.96-99
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• 2008

• Proceedings of the SAREK Conference
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• 2006.11a
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• pp.7-7
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• 2006

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2010.05a
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• pp.535-536
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• 2010

• 한국가스학회:학술대회논문집
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• 2002.05a
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• pp.78-85
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• 2002