• Proceedings of the Korea Air Pollution Research Association Conference
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• 2008.10a
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• pp.164-165
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• 2008

• Proceedings of the Korea Air Pollution Research Association Conference
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• 1997.10a
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• pp.98-99
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• 1997

• Proceedings of the KSRS Conference
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• 2004.10a
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• pp.581-581
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• 2004

• Proceedings of the Petrological Society of Korea Conference
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• 1999.06a
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• pp.42-42
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• 1999

• Proceedings of the KSEEG Conference
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• 1999.04a
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• pp.147-147
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• 1999

• Journal of the Korean earth science society
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• v.23 no.7
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• pp.531-542
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• 2002

The experimental side of earth science contains a lot of variables that cannot be controlled in the classroom or in the laboratory. Therefore, as one method to overcome these difficulties, a learning program using 3D Virtual Reality technique has been developed. The program was used with 701 middle school students. The result showed that the program had a very positive effect on inducing interest and motivation through a sense of immersion, and it also showed to be a big help in the improvement of space perception ability.

• Journal of the Korean earth science society
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• v.27 no.7
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• pp.745-756
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• 2006

Early Ordovician graptolites from the Mungok Formation of Yeongwol area, Korea comprise seven species belonging to six genera: Callograptus curvithecalis, Callograptus sinicus, Aspidograptus lotolatzensis, Dendrograptus suni, Dictyonema uniforme, Adelograptus cf. tenellus, and Psigraptus jacksoni. Two graptolite zones with three subzones are recognized in the eight sections of the Mungok Formation. The Adelograptus Zone is correlated with (1) La 1b of the Lancefield Formation of Victoria, Australia, (2) the Adelograptus-Clonograptus Zone of the Yehli Formation of Jilin, China, and (3) the Adelograptus Zone of the Road River Formation of Yukon, Canada. It suggests that the upper part of the Mungok Formation corresponds to early Late Tremadocian of Early Ordovician.

• The Bulletin of The Korean Astronomical Society
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• v.35 no.2
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• pp.53.1-53.1
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• 2010

Earth's polar motion has been known for more than one century, and it has been monitored by astrometric observation and recently by space geodetic technique. The Chandler and the annual wobbles are two dominant parts of Earth's polar motion. But according to our recent analysis on a relevant and accurate dataset, another polar motion component, of which period is about 500 days, exists with an amplitude of 20 milliarcseconds in average. This third largest component of polar motion should be caused by resonance of unidentified oscillating mode of Earth, possibly Earth's inner core wobble.

• Journal of the Korean earth science society
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• v.23 no.1
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• pp.105-111
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• 2002

The observation of the new biotite isograd (chlorite + chloritoid = andalusite + biotite) in the Mungyong coal field requires the modification of Harte and Hudson's (1979) metapelite grid which eliminates the stability field of staurolite + cordierite assemblages. The newly proposed metapelite grid by Ahn and Nakamura (2000) can define more properly the isograd reaction observed from nature. We discuss first topological interrelations between synthetic system (FASHO-, KFASHO-, KFMASH system) on an isobaric section at 2kbar, where phase relations are well constrained. The following discussion is concentrated on the topological relations between stable reactions. At the last, we discuss the petrogenetic significance of the Ahn's petrogenetic grid compared with theoretically computed grids. Ahn's petrogenetic grid is consistent with synthetic and natural system, and is one of the excellent example of KFMASH approximation in metapelite.

• Journal of the Korean earth science society
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• v.28 no.5
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• pp.603-612
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• 2007

Lower Ordovician (Upper Tremadoc) graptolites were found for the first time at the two sections of the Mungok Formation in Danyang area: the Seokgyori and Daejeonri sections. The graptolites from these sections comprise two species of two genera: Adelograptus brevibrachiatus and Psigraptus jacksoni. The graptolite faunas of the sections in the area show simple composition relative to Yeongwol area; they appear to be correlated to: (1) the Adelograptus cf tenellus Zone of Yeongwol area, (2) the Adelograptus cf. tenellus Zone of Yukon, Canada, (3) the Psigraptus Zone of Tasmania, Australia, and (4) the Psigraptus jacksoni Zone of Jilin, China. The age of graptolite beds of the Mungok Formation at Danyang appears to be early Upper Tremadoc of the Lower Ordovician.