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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean earth science society
Journal Basic Information
Journal DOI :
The Korean Earth Science Society
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Volume & Issues
Volume 30, Issue 7 - Dec 2009
Volume 30, Issue 6 - Oct 2009
Volume 30, Issue 5 - Sep 2009
Volume 30, Issue 4 - Aug 2009
Volume 30, Issue 3 - Jun 2009
Volume 30, Issue 2 - Apr 2009
Volume 30, Issue 1 - Feb 2009
Selecting the target year
Species Diversity and Leaf Form of Ginkgoaleans from the Mesozoic and Cenozoic Strata in Korea
Kim, Jong-Heon ;
Journal of the Korean earth science society, volume 30, issue 1, 2009, Pages 1~9
DOI : 10.5467/JKESS.2009.30.1.001
This paper conducted the general review of the 6 genera and 22 species of ginkgoaleans known from the Mesozoic and Cenozoic strata of Korea based on the recent palaeontological knowledge. Species diversity and leaf form of the Mesozoic and Cenozoic ginkgoaleans were discussed. Results showed that 4 genera 8 species from the Mesozoic strata and 1 genus and 1 species from the Cenozoic strata were recognized respectively. Laminae of the Mesozoic type of ginkgoaleans were mostly split into narrow lobes, but those of the Cenozoic type were characterized by their fan-shaped simple leaf.
Albizia Fruit Fossils from the Miocene Duho Formation of Yeonil Group in the Pohang Basin, Korea
Kim, Jong-Heon ; Lee, Seong-Bok ; An, Ji-Min ; Lee, Hye-In ; Hong, Han-Sol ;
Journal of the Korean earth science society, volume 30, issue 1, 2009, Pages 10~18
DOI : 10.5467/JKESS.2009.30.1.010
Two fruit fossils of Albizia miokalkora were collected from the Miocene Duho Formation of Yeonil Group in the northern Pohang Beach and Changpodong, Gyeongsangbug-do, Korea. The legume is flat and long and has 7 rounded seeds. Although the legume fossils are preserved as impression, they show their whole shape well. It is considered that the fossil Albizia might have flourished in a warm temperate climate in East Asia. This discovery is the second record of Albizia from the Neogene of Korea.
Paleostress from Healed Microcracks and Fluid Inclusions in Quartz of the Jurassic Granites in the Southwestern Ogcheon Folded Belt
Kang, Seong-Seung ; Yoo, Bong-Chul ; Jang, Bo-An ; Kim, Cheong-Bin ;
Journal of the Korean earth science society, volume 30, issue 1, 2009, Pages 19~32
DOI : 10.5467/JKESS.2009.30.1.019
Paleostress was interpreted by analyzing the healed microcracks and the secondary fluid inclusions in quartz of the Jurassic granites distributed in the southwestern Ogcheon Folded Belt, South Korea. The most dominant direction of healed microcracks in the study area was oriented
direction was also recognized. The formation temperatures of fluid inclusions were ranged
and the age of healed microcrack formations might have been approximately 166-200 Ma. Comparing the paleostress orientation obtained from the direction of healed microcracks to the formation age of healed microcracks estimated from the secondary fluid inclusions, it is considered that granitic rock body in study area was subject to a maximum horizontal principal stress along the NNW-SSE and WNW-ESE directions in the early Jurassic to middle Jurassic.
Basaltic Andesite-Siltstone Peperite in the Gyehwari Formation (Cretaceous)
Noh, Beyong-Seob ; Park, Jae-Moon ; Kim, Seung-Bum ; Ryang, Woo-Hun ;
Journal of the Korean earth science society, volume 30, issue 1, 2009, Pages 33~39
DOI : 10.5467/JKESS.2009.30.1.033
This paper presents the occurrence and characteristics of the basaltic andesite-siltstone peperite in the lower part of the Gyehwari Formation (Cretaceous), Buan-gun, Jeonbuk province, SW Korea. The peperite is associated with tabular basaltic andesite body, concordantly intercalated with red siltstone and silty sandstone interbeds of floodplain facies. Development of the peperite along the upper margin of the andesite and its textural transition from a dispersed blocky type inward into a closely packed type collectively indicate an intrusive origin (?sill) of the andesite. Magma intrusion and subsequent peperite formation suggest an active syndepositional volcanism since the early stage of evolution of the Gyehwa Basin. The andesite is dated at Late Cretaceous (Santonian) by K-Ar whole-rock radiometric method.
Seismic Wave Attenuation in the Southern Korean Peninsula: Separation of Intrinsic and Scattering Attenuations
Kim, Sung-Kyun ;
Journal of the Korean earth science society, volume 30, issue 1, 2009, Pages 40~48
DOI : 10.5467/JKESS.2009.30.1.040
The attenuation mechanism of seismic waves in the crust is controlled both by intrinsic absorption and scattering of energy. The amount of scattering and intrinsic energy losses from the total attenuation is separately estimated in this study for the southern Korean Peninsula. The formula to be deduced from the theoretical relationship between single back-scattered coda Q and multiple scattering theory was used to separate the total attenuation into the intrinsic Q and the scattering Q. It was found that the intrinsic Q was considerably lower than that of the scattering Q in the frequency range of 1.5 to 20 Hz. This fact implies that the energy loss caused by the intrinsic absorption is relatively larger than one by the scattering effect within the crust of the southern Korean Peninsula. Both intrinsic and scattering Q values appeared to be comparatively larger than those measured in other seismically active regions except for intrinsic Q in the frequency range of 1.5 to 3 Hz.
Analysis of a Structure of the Kunsan Basin in Yellow Sea Using Gravity and Magnetic Data
Park, Gye-Soon ; Choi, Jong-Keun ; Koo, June-Mo ; Kwon, Byung-Doo ;
Journal of the Korean earth science society, volume 30, issue 1, 2009, Pages 49~57
DOI : 10.5467/JKESS.2009.30.1.049
We studied a structure of the Kunsan basin in the Yellow Sea using ship-borne magnetic data and altimetry satellite-derived gravity data provided from the Scripps institution of oceanography in 2006. The gravity data was analyzed via power spectrum analysis and gravity inversion, and the magnetic data via analytic signal technique, pseudo-gravity transformation, and its inversion. The results showed that the depth of bedrock tended to increase as we approached the center of the South Central Sag in Kunsan basin and that the maximum and minimum of its depth were estimated to be about 6-8 km and 2 km, respectively. Inaddition, the observed high anomaly of gravity and magnetism was attributed to the intrusion of igneous rock of higher density than the surrounding basement rock in the center of South Central Sag, which was consistent with the interpretation of seismic data obtained in the same region.
The Impact of Interaction between Cloud and Longwave Radiation on the Asian Monsoon Circulation
Ryu, Geun-Hyeok ; Sohn, Byung-Ju ;
Journal of the Korean earth science society, volume 30, issue 1, 2009, Pages 58~68
DOI : 10.5467/JKESS.2009.30.1.058
Three-dimensional distributions of longwave radiation flux for the April-September 1998 period are generated from radiative transfer calculations using the GEWEX Asian Monsoon Experiment (GAME) reanalysis temperature and humidity profiles and International Satellite Cloud Climatology Project (ISCCP) cloudiness as inputs to understand the effect of cloud radiative forcing in the monsoon season. By subtracting the heating of the clear atmosphere from the cloudy radiative heating, cloud-induced atmospheric radiative heating has been obtained. Emphasis is placed on the impact of horizontal gradients of the cloud-generated radiative heating on the Asian monsoon. Cloud-induced heating exhibits its maximum heating areas within the Indian Ocean and minimum heating over the Tibetan Plateau, which establishes the north-south oriented differential heating gradient. Considering that the differential heating is a ultimate source generating the atmospheric circulation, the cloud-induced heating gradient established between the Indian Ocean and the Plateau can enhance the strength of the north-south Hadley-type monsoon circulation. Cooling at cloud top and warming at cloud bottom, which are the vertical distributions of cloud-induced heating, can exert on the monsoon circulation by altering the atmospheric stability.
Star Formation Rate and AGN in Barred Galaxies
Bang, Jun ; Ann, Hong-Bae ;
Journal of the Korean earth science society, volume 30, issue 1, 2009, Pages 69~80
DOI : 10.5467/JKESS.2009.30.1.069
We investigate the dependence of star formation rate and Active Galaxy Nuclei (AGN) frequency on the bar properties, especially the bar strength, using SDSS DR6. To better represent the bar strength, we divided the bars into 6 classes according to their length and axial ratios. There seems to be a fairly good correlation between the star formation rate derived from
emission lines and the bar strength, whereas there is no apparent correlation between the AGN activity and the bar strength. We interpret that the former correlation is due to the dependence of bar-driven gas inflow on the strength of bar. The lack of correlation between AGN and bar properties suggests that the accretion of gas onto a supermassive black hole (SMBH) is regulated by the interplay between the bar and SMBH. The frequency of AGN seems to be dependent on the background density but the star formation rate does not. It suggests that star formation is a localized phenomenon that is mostly determined by the gas density in a galaxy, while AGN activity is more closely related to the host property such as mass and luminosity that are thought to be dependent on the environment through the density-luminosity relation.
Analysis of Fieldtrip-related Perception and Attitudes of Science-talented Students: A Case of Winter School in Korea Earth Science Olympiad, 2007
Ryu, Chun-Ryol ;
Journal of the Korean earth science society, volume 30, issue 1, 2009, Pages 81~95
DOI : 10.5467/JKESS.2009.30.1.081
The purpose of this study wasto analyze the factors that enhance their learning achievement in a fieldtrip environment. For this academic goal, we analyzed a pattern of fieldtrip-related perception and attitudes of 19 science-talented students who participated in the 2007 KESO winter school. As for the perception type, the result of analysis showed that the science-talented students understood a fieldtrip as an experimental inquiry from an inquiry perspective, and that their understanding about a fieldtrip was based on anthropocentrism, positivism and instrumentalism from a science philosophy perspective. Regarding theattitudes type, the result revealed that the purpose of the winter school was mainly to learn knowledge in earth science, and that there was a significant tendency for the participating students to become a future scientist more eagerly than their parents expected. Students' fieldtrip-related academic self-concept was mostly positive while the participants experienced both positive and negative emotions.
An Analysis of Students' Cognitive Characteristics through a Drawing Activity in Teaching Module of the Earth Systems Education
Oh, Hyun-Seok ; Kim, Je-Heung ; Yu, Eun-Jeong ; Kim, Chan-Jong ;
Journal of the Korean earth science society, volume 30, issue 1, 2009, Pages 96~110
DOI : 10.5467/JKESS.2009.30.1.096
The ESE (Earth Systems Education) teaching module was developed to teach an "Earth and Star" unit for the 8th grade (aged 14) students. The planet remodeling activity was developed as a sub-ESE teaching module. The main point of this activity was that students were supposed to remodel planets for life to live on. The purpose of this study was to visualize students' thought and to interpret their understandings through their drawings and writings. A framework of analysis with four categories was designed and applied to analyze students' cognitive structure. In order to explore students' cognitive contents, the analyzing factors were classified into two domains: subsystems of the earth systems and use of science & technology. Results revealed via the planet remodeling activity that students' cognitive characteristics were impacted by ESE activities such as Earth literacy.
An Analysis of High School Students' Mental Models on the Plate Boundaries
Park, Soo-Kyong ;
Journal of the Korean earth science society, volume 30, issue 1, 2009, Pages 111~126
DOI : 10.5467/JKESS.2009.30.1.111
The purpose of this study was to derive the criterions of each type of mental models on the plate boundaries and to investigate high school students' mental models on these concepts. The 11th grade student participants were requested to draw the collisional, convergent, and divergent boundaries and were interviewed individually. The drawings and the data gathered through the interviews were analyzed qualitatively. The mental models on the plate boundaries were classified as 'naive model', 'unstable model', 'causal model', and 'conceptual model'. The criterions for analyzing the mental models were the differentiations of the lithospheric plates and the mantle, the explanations of the motion of the plates and lower mantle, the demonstrations of topographical features of the plate boundaries and the causal relationships between the mantle convection and the topographical features. The findings revealed that the students holding 'the naive model' and 'the unstable model' were unable to relate the mantle convection and the three boundaries. In contrast, the students holding 'the causal model' and 'the conceptual model' were able to explain that the mantle convection causes the three boundaries. Also, the types of epistemological belief were different depending on their mental models. Students holding the naive model and the unstable model tended to rely upon the external authorities.
Characteristics of Children's Interactive Learning in a Natural History Museum
Kim, Ki-Sang ; Lee, Sun-Kyung ; Kim, Chan-Jong ;
Journal of the Korean earth science society, volume 30, issue 1, 2009, Pages 127~140
DOI : 10.5467/JKESS.2009.30.1.127
The purpose of this study was to explore the characteristics of children's interactive learning focusing on the Vygotsky's ZPD (the zone of proximal development) in a natural history museum as a representative free-choice learning context. We focused on the understanding of peer dyadic discourses and data were collected from 13 peer groups of children (3rd and 4th graders) who were videotaped all conversations occurred as they visited around the exhibits with no predetermined path. The transcribed data were analyzed by the developmental level of ZPD system and the discourse within an ADL (an actual developmental level) was overwhelmingly common in the conversations between child-child dyads. The representative discourse by discourse types were parsed according to three constructs of ZPD. Children formed the intersubjectivity through semiotic mediation such as conversations and exhibits and ended up with the similar situation definition. In conclusion, the details of discourses of the most impressive dyad were looked into focusing on the scientific concept. The study implies that a natural history museum becomes a meaningful resource to offer a deeper understanding of the nature of children's learning as an informal learning setting.
Creation and Elaboration of Problem Space Depending on Students' Attitudes toward the Task and Thinking Skills
Kim, Kyung-Jin ;
Journal of the Korean earth science society, volume 30, issue 1, 2009, Pages 141~151
DOI : 10.5467/JKESS.2009.30.1.141
Inquiry has been emphasized in science classrooms, but the problems shown in the inquiry are somewhat different with ones that students usually meet and experience in everyday life. The purpose of this study is to investigate how attitudes toward the task and thinking skills affect students' problem solving process, especially, the way of creating a problem space and elaborating problem solving strategies when they have little schema. The difference in students' problem solving strategies of Lego Robotics class, one of the summer programs for
grade gifted students, which is new to them, was investigated. The results are as follows: (1) The difference in attitudes toward the task, or selection and identification of the missions, and the perception of operators, affected creating a different problem space. (2) Different level of thinking skills, or analytical and flexible thinking, efficient elaborative skill, and application of schema affected a different level of elaboration of the problem space and resulted in asuccess rate of problem solving. (3) Different initial problem space resulted in different problem solving strategies. But without thinking skills, students could not elaborate problem solving strategies efficiently. Several instructional recommendations to promote scientific inquiry were suggested based on the results.