• Proceedings of the Korean Society of Crop Science Conference
• /
• 1999.05a
• /
• pp.53-54
• /
• 1999

• Proceedings of the Korean Society of Crop Science Conference
• /
• 2003.05a
• /
• pp.58-58
• /
• 2003

• Proceedings of the Korean Society of Crop Science Conference
• /
• 2003.05a
• /
• pp.71-71
• /
• 2003

• Proceedings of the Korean Society of Crop Science Conference
• /
• 2003.05a
• /
• pp.47-47
• /
• 2003

• Proceedings of the Korean Society of Crop Science Conference
• /
• 2001.05a
• /
• pp.266-267
• /
• 2001

• Proceedings of the Korean Society of Crop Science Conference
• /
• 2001.05a
• /
• pp.180-181
• /
• 2001

• Proceedings of the Korean Society of Crop Science Conference
• /
• 1991.10a
• /
• pp.54-55
• /
• 1991

• Proceedings of the Korean Society of Crop Science Conference
• /
• 1991.10a
• /
• pp.52-53
• /
• 1991

• Journal of Korean Elementary Science Education
• /
• v.36 no.1
• /
• pp.1-15
• /
• 2017

The purpose of this study is to analyze the problems of land and sea breeze model experiment that has presented in $5^{th}$ grade curriculum in chapter "Weather and our lives" and makes better model simulation so that learners can have better and more effective way to study it. To survey the opinions from dedicated teachers about land and sea breeze model experiment, we produced the survey through interview with science exclusive teacher from M elementary school. An elementary science education expert, 3 men of science EdD modified and complemented survey and started Delphi survey to 12 science teachers who have career teaching more than 3 years. The problems found in this survey were 'one heat bulb, short heating time, small temperature difference of water and sand, lack of class time, empty space between sand and water, back of transparent boxes, little amount of scent and the location of the it' etc. But the most of all, it is hard to see the successful result of the experiment. Based on these kinds of investigations, and lots of trial and error, redesigned the new model experiment that has the most similarity to the real one and high probability of success. According to this, it was able to see the smoke forms horizontal movement along the sand and the smoke goes in one circulation cycle. through this experiment, we made a conclusion that although those scientific experiments in textbook were developed through lots of considerations of expert, to consider the aspect of consumer, it needs to reach the educational agreement about simulation experiment so that It can lead to successful experiment and high quality education.

• Korean Journal of Agricultural Science
• /
• v.41 no.4
• /
• pp.405-413
• /
• 2014

The evolutionary history of cattle and buffalo has always been a topic of great interest to the evolutionary biologists. The phylogenetic studies of bovin species has been carried out at various levels, varying from the study of domestication and migration of populations to major cladogenesis. Along with the archeological studies there are studies from molecular biology and more recently from genomics. The phylogenetic perspective of the bovins and their evolutionary history, are reviewed in terms of what has been done, what needs to be done and potential challenges in doing it.