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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
Editor in Chief :
Volume & Issues
Volume 20, Issue 6 - 00 1999
Volume 20, Issue 5 - 00 1999
Volume 20, Issue 4 - 00 1999
Volume 20, Issue 3 - 00 1999
Volume 20, Issue 2 - 00 1999
Volume 20, Issue 1 - 00 1999
Selecting the target year
Development and Application of a Geological Mapping Experimental Kit
Im, Seong-Gyu ; Han, Seung-Hui ; Lee, Yun-Jong ; Jeong, Won-U ;
Journal of the Korean earth science society, volume 20, issue 6, 1999, Pages 587~587
The purpose of this study is to develop an experimental kit and to evaluate the effectiveness of experimental kit in the concept-forming about the measurement of strike and dip, and the interpretation of the geological map. Unfortunately a proper experimental kit on this subject has not been developed and introduced in the current domestic earth science textbooks. In this study, the geological structure models with 4 different dips were developed. The effectiveness of the experimental kit was evaluated by comparing the test results performed by the experimental group who studied the subject with the experimental kit with those results performed by the control group who studied the subject without the kit. The experimental group was consisted of 102 girls and the control group was 104 girls of a high school in Taegu City. The test results are as follows: i) The mean of the test results of the experimental group is 7.18, while that of the control group is 6.38. ii) The difference of the test scores between two groups has been turned out to be highly significant at the level of significance of 0.05. This analysis suggests that the experimental group is more effective in the concept-forming about the measurement of strike and dip, and the interpretation of geological map than the control group.
Conceptual Change According to Intellectual Levels Before and After Learning
Guk, Dong-Sik ;
Journal of the Korean earth science society, volume 20, issue 6, 1999, Pages 595~595
The purpose of this study is to identify the misconception before and after instruction about the season change, to analyze the differences of them between an excellent class and average class, and to investigate the understanding type and achievement level of students. The questionnaire of sixteen items was used and the subject was 98 students who were in two average classes and one excellent class in the second grade of middle school. The results are as the followings. 1) 20 misconceptions about the season change before learning are identified. They are related to altitude, temperature and the change of length of a day. These misconceptions are tend to decrease after learning but some are continued partially and reinforced. Some different tendencies between excellent class and average classes according to the concepts related with season change are found. 2) The understanding level shows that the level of perfect understanding of excellent class increased from 44.2% before learning to 77.2% after learning, from 26.9% to 44.5% in average class. 3) The students in average classes showed phenomenal and intuitional understanding types that are concentrated on observable phenomena and excellent class understood the scientific terms than average class but they have new misconceptions after learning by memorizing them simply.
A Textbook Analysis on the Basis of Goals in the High School "Earth Science" Curriculum
Journal of the Korean earth science society, volume 20, issue 6, 1999, Pages 605~605
The purpose of this study was to verify how the National Curriculum has been reflected to the development of high school $quot;Earth Science$quot; textbooks. To achieve this purpose, the Third and Sixth National Earth Science Curriculum and 12 high school $quot;Earth Science$quot; textbooks were selected for analysis. The criteria for the analysis were the goals of each National Curriculum. The results were four $quot;Earth Science$quot; textbooks developed by the Third National Curriculum and eight $quot;Earth Science I$quot; and $quot;Earth Science II$quot; textbooks developed by the Sixth National Curriculum overemphasized the `knowledge' goals comparing with other goals such as inquiry, integrative learning, development of knowledge, and STS. It is suggested that any goal of the Seventh National Curriculum should not be neglected in the textbook development.
Some Important Factors Affecting the Inversion of Surface Wave Dispersion
Journal of the Korean earth science society, volume 20, issue 6, 1999, Pages 613~613
S-wave velocity structures in the shallow sub-surfaces can be found by inverting the dispersion curves of surface waves. The relationship between the s-wave structure and the dispersion curve is neither linear nor unique. This complicates the inversion process of surface waves. This study identifies some important factors in the inversion process The depth to the half space and the thicknesses of the layers seem to be the most important factors in the initial model. When the depth to the halt space is quite shorter than the true model, the inversion becomes unstable and the dispersion curve of the inverted model never fits that of the true model. Also, it often happens that the inverted model does not becomes close to the true model even when the phase dispersion curve of the inverted model fits that of the true model. The role of spacial resolution matrix becomes more evident because of the problem of the non-uniqueness described above. It is also shown in this study that the p-wave velocity may be used effectively in the inversion of surface waves when the Poisson's ratios in the sub-surface is not known
Trend Analysis of the Degree Days owing to Global Warming in Korea
Journal of the Korean earth science society, volume 20, issue 6, 1999, Pages 620~620
Trend analysis of the cooling and heafing degree days of Korea were studied using the daily mean air temperature data measured at the several meteorological observatory for 20 years (1978∼1997). It was found that the heating degree days tended to decrease from year to year. However, the cooling degree days were nearly unchanged during the analysis periods. The number of days calling for air-heating also tended to decrease as time passes. And those of air-cooling were nearly unchanged during the same time. It means that the change of air-heating condition owing to global warming came in evidence in the winter season, but that of air-cooling condition was slight in the summer season.
An Omitted Mechanism of Moist Cellular Convection with Stratus over Ocean
Journal of the Korean earth science society, volume 20, issue 6, 1999, Pages 625~625
A two-dimensional numerical experiment on moist convection over sea surface showed that a cellular convection is sustained in the lower atmosphere which contains stratus in the upper part without 1) heating from below by sensible heat flux, 2) radiation cooling at the cloud top or 3)cooling due to entrainment of dry air from cloud top. The vertical stratification of the convective layer is neutral or slightly stable. The horizontal scale of a convective cell is about 10 times greater than the depth of the convective layer. Mechanism to sustain the cellular convection is considered as follows: Consider a marine atmospheric boundary layer with stratus in the upper part. The sensible heat flux is downward but the latent heat flux upward at the sea surface. The water vapor is transported upward if a cellular convection takes place. It is condensed in the ascending region of the convective cell. Therefore, the (equivalent) potential temperature in the ascending region of the convective cell is a little higher than that of the descending region. Thus horizontal temperature gradient is created in the cloud layer. And it maintains the cellular convection. But its intensity is weaker than that driven by radiation cooling or entrainment effect at the cloud top.
A Preliminary Study on the Green Bullet for the Sustainable Development of the Blue Planet
Han, Uk ; Park, Mu-Chun ;
Journal of the Korean earth science society, volume 20, issue 6, 1999, Pages 631~631
The sustainable development is one of the most compatible solutions to satisfy the environmental and economic requirements. In order to achieve the sustainable development and systematic maintenance on the blue planet, the applications of environmental carrying capacity are required. The united states and German forces maintain the military training areas and ammunitions using environmental carrying capacity to support suitable training conditions and guarantee sustainable use of weapon systems. The introduction of the Green Bullet concept is useful for the reduction methods of environmental contamination during the production, carrying out and abolishment of weapon systems. The application of clean technology, environment remediation, and regeneration technology on the defense will greatly decrease the environment contamination loads.
Petrochemical Study on the Cretaceous Volcanic Rocks in the Namhae island, Korea
Kim, Jin-Seop ; Lee, Jun-Dong ;
Journal of the Korean earth science society, volume 20, issue 6, 1999, Pages 640~640
This study reports the results about the petrography and geochemical characteristics of the Cretaceous volcanic rocks distributed in the vicinity of the Namhae island composed of basaltic, through andesitic rocks, dacitic welded tuff, and rhyolitic rocks in ascending order. Sedimentary rock is the basement in the study area covered with volcanic rocks. Andesitic rocks compose of pyroclastic volcanic breccia, lithic lapilli tuff and cryptocrystalline lava-flow. Most dacitic rocks are lapilli ash-flow welded tuff. Rhyolitic rocks consist of rhyolite tuff and rhyolite lava-flow. Rhyolite tuff are lithic crystal ash-flow tuff and crystal vitric ash-flow tuff with somewhat accidental fragments of andesitic and sedimentary rocks. Aeidic dyke inwdes in to andesitic, dacitic and rhyolitic rocks. The variation of major and trace element of the volcanic rocks shows that contents of Al₂O₃, FeO, CaO, MgO, TiO₂ decrease with increasing of SiO₂. On the basis of variation diagrams such as Al₂O₃ vs. CaO, Th/Yb vs. Ta/Yb, and Ce_N/Yb_N vs. Ce_N, these rocks represent mainly differentiation trend of calc-alkaline rock series. On the discriminant diagrams such as Ba/La and La/Th ratio, Rb vs. Y+Nb, the volcanic rocks in the study area belong to high-K orogenic suites. According to the tectonic discriminant diagram by Wood, these rock falls into the destructive continental margin. Volcanic rocks in the study area show well correlation to the Yucheon Group in terms of rock age dating and geochemical data, and derived from andesitic cale-alkaline magma
Evolution of Penguins
Journal of the Korean earth science society, volume 20, issue 6, 1999, Pages 652~652
Fossil penguins occurred only in the southern hemisphere, not beyond the area covered by the present occurrence of penguins. They were found in New Zealand, southern Australia, Patagonia, Seymour Island off the Antarctic Peninsula, and South Africa. It is assumed that penguins were evolved from Procellariiformes including albatrosses and diving petrels in warm temperate zone in the late Eocene. Furthermore, Penguins developed for submarine life physical characteristics such as the loss of flight, skeleton structures for subaqueous swimming, and catching preys as well as physiological characteristics such as conservation of body heat and hatching strategies and related facts. In particular, the better mechanisms for body heat retention were developed in the penguins inhabited in the Antarctic compared to those in the northern cool temperate zone. The fact that the young penguins cannot swim before fledgling stage suggests that penguin evolved from a diving petrel or one waterfowl similar to it and changed life style from floating to diving during evolution. Penguins developed their strategies and operational techniques against natural enemies such as Leopard seals and skuas. Penguins began to adapt to the various environments from the warm temperate marine condition to the cold marine ones after their emergence. It is believed that half of the extinct penguins were bigger than Emperor penguin, the biggest species among living penguins.