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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean earth science society
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Journal DOI :
The Korean Earth Science Society
Editor in Chief :
Volume & Issues
Volume 31, Issue 7 - Dec 2010
Volume 31, Issue 6 - Oct 2010
Volume 31, Issue 5 - Sep 2010
Volume 31, Issue 4 - Aug 2010
Volume 31, Issue 3 - Jun 2010
Volume 31, Issue 2 - Apr 2010
Volume 31, Issue 1 - Feb 2010
Selecting the target year
Application of Indicator Geostatistics for Probabilistic Uncertainty and Risk Analyses of Geochemical Data
Park, No-Wook ;
Journal of the Korean earth science society, volume 31, issue 4, 2010, Pages 301~312
DOI : 10.5467/JKESS.2010.31.4.301
Geochemical data have been regarded as one of the important environmental variables in the environmental management. Since they are often sampled at sparse locations, it is important not only to predict attribute values at unsampled locations, but also to assess the uncertainty attached to the prediction for further analysis. The main objective of this paper is to exemplify how indicator geostatistics can be effectively applied to geochemical data processing for providing decision-supporting information as well as spatial distribution of the geochemical data. A whole geostatistical analysis framework, which includes probabilistic uncertainty modeling, classification and risk analysis, was illustrated through a case study of cadmium mapping. A conditional cumulative distribution function (ccdf) was first modeled by indicator kriging, and then e-type estimates and conditional variance were computed for spatial distribution of cadmium and quantitative uncertainty measures, respectively. Two different classification criteria such as a probability thresholding and an attribute thresholding were applied to delineate contaminated and safe areas. Finally, additional sampling locations were extracted from the coefficient of variation that accounts for both the conditional variance and the difference between attribute values and thresholding values. It is suggested that the indicator geostatistical framework illustrated in this study be a useful tool for analyzing any environmental variables including geochemical data for decision-making in the presence of uncertainty.
Carbon Isotope Analysis for the Climatic Environment Change in South Korea During the Holocene: a Case Study in Yengjong Islands of Yellow Sea
Jung, Hea-Kyung ; Park, Ji-Hoon ; Kim, Cheong-Bin ;
Journal of the Korean earth science society, volume 31, issue 4, 2010, Pages 313~321
DOI : 10.5467/JKESS.2010.31.4.313
The landform of the study area is defined as a small-scale alluvial plain in the valley bottom adjacent to the coast. By the aggradation of alluvial materials, this valley bottom plain was formed in dissected parts of low hills. For the purpose of reconstructing the palaeo climate environment in this study,
analysis and soil organic carbon analysis are therefore employed. Main results of this study are as follows: Section I: the period of
B.P. was mostly in warm and humid climate environment. A little changes of the humid environment are detected as subdry (or sub-humid)
humid in terms of the dryness and wetness. Section II: the period of
B.P.-2,200 yr B.P. was in warm and humid climate environment, which is similar to the present. However, The sediments between
B.P. experienced the most humid climate environment of all studied sedimentary layers. After
B.P., the environment started to change from the humid to the sub-humid (or sub-dry) climate. Section III: the period of 2,200 yr B.P.
B.P. was distinguish from previous two sections as the environmental changes to sub-humid (or sub-dry) climate was apparent.
Distribution of Precipitation on the Korean Peninsula Associated with the Weakening of Tropical Cyclones
Hwang, Ho-Seong ; Byun, Hi-Ryong ; Lee, Sang-Min ; Choi, Ki-Seon ; Lee, Ji-Sun ;
Journal of the Korean earth science society, volume 31, issue 4, 2010, Pages 322~334
DOI : 10.5467/JKESS.2010.31.4.322
Spatiotemporal characteristics of precipitation in Korea, associated with the weakening of Tropical Cyclones (TCs) around the Korean Peninsula (
) over the last 30 years (1979-2008), were investigated. Weakened TCs are classified as WEC (Weakened to Extratropical Cyclone) and WTD (Weakened to Tropical Depression). In WEC, precipitation was evenly distributed all over the Korean Peninsula and the greater precipitation was recorded in the southern coast. In WTD, the most precipitation was recorded in the southern coast but low precipitation was recorded in the central and inland areas of Korea. The difference of precipitation between WEC and WTD was not statistically significant in Region 2 (Jeollanam-do, Gyeongsangnam-do, southeastern part of Gyeongsangbuk-do, Jeju-do); however, the precipitation resulting from WEC was greater than that resulting from WTD in Region 1 (central area of Korea, Jeollabuk-do, inland of Gyeongsangbuk-do). In WEC, the developed upper-level potential vorticity (PV) and low-level temperature trough shifted to the northwest of TCs approaching Korea. In addition, an upper-level jet stream and strong divergence field were observed to the northeast of the TCs. It was assumed that these meteorological factors had induced baroclinic instability and diabatic process, which created a large precipitation area around the TCs. However, the intense PV, temperature trough, jet stream were not observed in WTD, which created a small precipitation area around the TCs.
Characteristics by the Cloud-to-Ground Lightning Polarity Occurred over South Korea
Myoung, Ji-Su ; Suh, Myoung-Seok ;
Journal of the Korean earth science society, volume 31, issue 4, 2010, Pages 335~347
DOI : 10.5467/JKESS.2010.31.4.335
The statistical characteristics of Cloud-to-Ground (CG) lightning data, observed by the total lightning detection system (TLDS) of KMA during the recent seven years (2002-2008), have been analyzed. Lightning frequency shows a strong interannual, seasonal and diurnal variations without regard to the polarity. The 74% and 0.6% of the total lightning occurred during the summer and winter, respectively. And it has a bimodal diurnal variation with two peaks (dawn: 0500-0700 LST, mid-afternoon: 1500-1600 LST). The ratio of positive flashes to negative ones also has a strong seasonal variation with the maximum and minimum during winter (62.5%) and summer (7.3%), respectively. Unlike the lightning frequency, the lightning intensity of negative flashes shows a weak interannual, seasonal and diurnal variations. However, the lightning intensity of positive flashes exhibits an inverse seasonal variation to that of lightning frequency, with the minimum and maximum during summer and winter, respectively. The lightning density is greatly higher in the western inland areas and the West/South Sea than in the eastern part and the East Sea. In general, the lightning intensity is stronger in the ocean, especially in the East Sea than in the inland area, regardless of the polarity.
Diurnal Variation of Equivalent Width of H
O and O
in Earth's Atmosphere
Kang, Dong-Il ;
Journal of the Korean earth science society, volume 31, issue 4, 2010, Pages 348~353
DOI : 10.5467/JKESS.2010.31.4.348
The scattered light of solar radiance near the infrared ray area was observed to measure
absorption lines. The changes of
equivalent width were calculated on the basis of the measurement.
equivalent width showed negative correlation with the amount of solar radiance;
equivalent width had a tendency to diminish as the amount of the solar radiance increased and to increase as the amount of the solar radiance decreased. On the other hand,
equivalent width showed the positive correlation with the amount of solar radiance. Especially it was noted that the sum of equivalent width of absorption lines created by
in a day was fairly constant. It is implied that the constant equivalent width is caused by the complementary development of photodissociation and recombination in
An analysis of Characteristics of Heavy Rainfall Events over Yeongdong Region Associated with Tropopause Folding
Lee, Hye-Young ; Ko, Hye-Young ; Kim, Kyung-Eak ; Yoon, Ill-Hee ;
Journal of the Korean earth science society, volume 31, issue 4, 2010, Pages 354~369
DOI : 10.5467/JKESS.2010.31.4.354
The synoptic and kinematic characteristics of a heavy rainfall that occurred in Gangneung region on 22 to 24 October 2006 were investigated using weather maps, infrared images, AWS observation data and NCEP global final analyses data. The total amount of rainfall observed in the region for the period was 316.5 mm, and the instanteneous maximum wind speed was
. According to the analysis of weather maps, before the starting of the heavy rainfall, an extratropical low pressure system was developed in the middle region of the Korean Peninsula, and an inverted trough was formed in the northern region of the peninsula. In addition, a jet stream on the upper charts of 300 hPa was located over the Yellow Sea and the southern boundary of the peninsula. A cutoff low in the cyclonic shear side of the upper jet streak, which was linked to an anomaly of isentropic potential vorticity, was developed over the northwestern part of the peninsula. And there are analyzed potential vorticity and wind, time-height cross section of potential vorticity, vertical air motion, maximums of the divergence and convergence and vertical distribution of potential temperature in Gangneung region. The analyzed results of the synoptic conditions and kinematic processes strongly suggest that the tropopause folding made a significant role of initializing the heavy rainfall.
Radio Observation of L1521F using HCN (J=1-0) Line
Sohn, Jung-Joo ; Lee, Chang-Won ;
Journal of the Korean earth science society, volume 31, issue 4, 2010, Pages 370~377
DOI : 10.5467/JKESS.2010.31.4.370
In this study, we investigated the kinematical properties of the L1521F-IRS in Taurus region using HCN (J=1-0) molecular line. The high resolution mapping has carried out by
point observations covering
area using a 12-m telescope of Arizona Radio Observatory in Tucsan, USA. L1521F which harbors the faint infrared L1521F-IRS, displayed a strong central concentration of integrated intensity in HCN without serious molecular depletion. It showed a symmetric kinematical structure with the opposite infall motion in either side of the central cores. It is a direct evidence of bipolar outflows in the core of L1521F.
Graph Interpretation Ability and Perception of High School Students and Preservice Secondary Teachers in Earth Science
Lee, Jin-Bong ; Lee, Ki-Young ; Park, Young-Shin ;
Journal of the Korean earth science society, volume 31, issue 4, 2010, Pages 378~391
DOI : 10.5467/JKESS.2010.31.4.378
The purpose of this study was to investigate the graph interpretation ability and perception of high school students and preservice secondary teachers in Earth science. We developed two different instruments; one was a graph interpretation ability inventory that consists of 9 graph types with 18 items, and the other one is two questionnaires to explore the participants' perception about Earth science-related graph. The results of this study are as follows: High school students and preservice secondary teachers demonstrated their remarkable ability in interpreting a line graph, but showed their limited ability with the graph of overlapped and directional change, which means the graph interpretation ability was affected by a graph type; two groups participated in this study revealed a considerable difference in the graph interpretation ability depending on the grade level; preservice teachers were superior to high school students in discriminating two graphs, the representation method, which are different with the same topic; and many participants in both groups considered that the property of Earth science graph was considerably different from that of other science subjects, especially in directional change graph, scatter graph, contour map, and domain graph. The results suggest that the effective graph instruction strategies be developed in Earth science learning.
An Analysis and Evaluation of Cyber Home Study Contents for Self-directed Learning - Focused on the Earth Science Content of the Science Basic Course for the 7
Na, Jae-Joon ; Son, Cheon-Jae ; Kook, Dong-Sik ;
Journal of the Korean earth science society, volume 31, issue 4, 2010, Pages 392~402
DOI : 10.5467/JKESS.2010.31.4.392
The purpose of this study is to analyze and evaluate the self-directed learning contents of Earth science area in the basic course of the 7th grade. For this purpose, we applied the 'Cyber Home Study Content Quality Control Tool' presented in 'Elementary Secondary Education e-Learning Quality Management Guidelines (Ver.2.0)' of Korea Education & Research Information Service (2008). The results of contents analysis are as follow: First, it was presented that the study guide introduced the contents which should be studied for one class, properly. And it was not analyzed that the diagnosis assesment was not completed in the initiative study; Second, it was possible to study choosing the contents fitting the learner's level of learning in the main study, it was comprised of about 15 minutes. Third, it was performed without feedback for incorrect answers in the learning assessment, just the number of wrong questions. And the learning arrangement present the important contents learned in that class, summarizing and arranging again. The results of content evaluation are as follows: First, a big difference was not showed against the needs analysis, instructional design, interaction in each class. And the evaluation of the ethics was not included a word or sentence not suitable. The evaluation of copyright, it was analyzed that Work within the content display in compliance with international copyright Second, the evaluation of instructional design presented mainly the description of a simple picture based, the visible resources like flash card were poor. And in the evaluation of Supporting System, it was presented that the contents were installed so that it was freely available for learners. But it was analyzed that there was no memo-function learners were able to jot down something during the studying contents. And in the evaluation for evaluation, the clear valuation basis about the described content was not presented. So there were slightly differences for each class. Third, in the evaluation and analysis for learning content, it was presented that there were some big differences for each class because it was not composed of the latest information, not corrected and complementary.
Research on the Changes of Beginning Science Teachers' Teaching through a Mentoring Program
Kwak, Young-Sun ;
Journal of the Korean earth science society, volume 31, issue 4, 2010, Pages 403~417
DOI : 10.5467/JKESS.2010.31.4.403
In this research, we investigated the effect of a mentoring program implemented in science classrooms taught by beginning teachers in order to support their professional development. As a baseline data, we examined the characteristics of beginning science teachers' teaching. Then we explored any changes in mentee teachers' teaching with the implementation of a mentoring program. The three mentor-mentee pairs participated in this study. We explored six teachers' classroom teaching episodes with their videotaped classroom teaching. Using open-ended interviews and group discussions taking place on a regular basis to analyze and compare classes of six teachers, we extracted the beginning teachers' teaching characteristics in light of teaching strategies. The common features of the participated mentee teachers' teaching are analyzed in terms of (1) classroom culture and management, (2) classroom discourse, and (3) science experiments. Through mentoring, mentee teachers recognized that increased and enriched classroom dialogues had an effect on students' content understanding. Mentee teachers also acknowledged not only the necessity of laboratory activities but also the roles and ways of managing the science activities. Ways to help beginning teachers develop instructional professionalism are discussed.