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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 18, Issue 6 - Dec 1997
Volume 18, Issue 5 - 00 1997
Volume 18, Issue 4 - 00 1997
Volume 18, Issue 3 - 00 1997
Volume 18, Issue 2 - 00 1997
Volume 18, Issue 1 - 00 1997
Selecting the target year
Development of Constructivist Instructional Strategy for Earth Science Concept Learning
Kim, Sang-Dal ;
Journal of the Korean earth science society, volume 18, issue 3, 1997, Pages 163~163
According to the constructivistic view of learning, students have already had conceptions about the natural phenomena before they were exposed to the specific science content. The students' conceptions have not been changed easily even though they have taken the science instruction. The effects making students overcome their non-scientific conceptions have been an important issue at the field of science education. The purpose of this study is to identify students' preconceptions about atmospheric pressure, to develop constructivist instructional strategy for earth science concept learning. In order to develop instructional strategy, several constructivistic instructional model was analyzed and findings about students' preconceptions was reviewed Through the analyzing of the current science textbook of middle school, the important conceptions were selected. As a result from pilot study used the subject questionnaire method, the examples of two-tier questionnaire for the main study were determined. The subjects of this study are 96 students who are randomly selected from second grade in the middle school. The results of this study, the students' misconceptions related to the definition of atmospheric pressure, the directions of atmospheric pressure and the atmospheric weight are identified. The four steps of constructivist instructional strategy which was developed in this study are 1) predictions and explanations-2) observation and experiments-3) discussions-4) applications.
Thermal Stress Distribution within the Lithosphere of East Sea of Korea
Han, Uk ;
Journal of the Korean earth science society, volume 18, issue 3, 1997, Pages 176~176
The thermal stress distribution of East Sea of Korea was investigated by two mathematical methods. The first approach considered that the distribution of stress by the boundary force was calculated by using the Bouguer gravity anomaly. The stress field between the lithosphere and the asthenosphere was closely related with Moho depth. The compressional stress was generated in Japanese island, and the tensional stress was generated in East Sea of Korea. However, the stress fields in Yellow Sea and Northern China is very weak. The second approach was to construct a stress profile in the A-A' line using the topographic data and internal density structure. The models presented here predict that the velocity vectors in Japanese island is very high, and those in Korea and Yellow Sea are rather low. The deviatoric stresses here were calculated and reflect compressional in Japanese island, and tensional in East Sea of Korea.
Geological Feasibility of the Site for Locks at Naktong River Section in Kyungbu Canal
Journal of the Korean earth science society, volume 18, issue 3, 1997, Pages 183~183
To facilitate the carriage of goods and enhance the economic growth, our country need to construct Kyungbu canal connecting Han and Naktong rivers by tunnel of 20.5 km length and 125 m altitude. To reach this height, several locks are to be made along the river. However, the lockage leads delay of transport, so the number of locks should be minimized. From the geological map, we investigated the sites of locks in the section of Naktong river, and proposed two designs for the arrangement of locks; first, the five locks with a lift higher than 20 m each and secondly, the seven locks with a lower lift at the downstream. Two locks at the upstream, common to both design, stands in the area of limestone where is hardly an appropriate for the dam site.
Measurements of Spatial and Long-/Short-Term Distribution Trends of Airborne Trace Metals from four Observatory Sites Located in Won Ju City
Journal of the Korean earth science society, volume 18, issue 3, 1997, Pages 191~191
The distribution and behavior of seven heavy metals were investigated in terms of geographical and spatial variabilities using the data collected from four observatory sites of Won Ju City in the central part of the Korean Peninsula. Measurements were made from each of the four network sites representing grassland, residential, commercial, and industrial areas (Site No. 1 through 4) during four and half year periods covering 2/91 through 8/95. The mean metal concentrations for the four study sites were found in the range: 1.444∼2.243 (Fe), 0.088∼0.326 (Pb), 0.002∼0.004 (Cd), 0.008∼0.021 (Cr), 0.194∼0.469 (Cu), 0.032∼0.095 (Mn), and 0.015∼0.026 (Ni) ㎍ m^(-3). According to our analysis of data, most metals were found to exhibit geographical distribution patterns comparable to ones expected based on our site-selection scheme such that concentrations tend increase with increasing site number. The data for each sampling site, when inspected for seasonal patterns, indicated that Pb, Fe, Mn, and Ni were classified as so-called, 'high winter to low summer' patterns, while others were more complicated to specify. Similarly to the seasonal distribution patterns, the results of linear regression analysis, intended to examine long-term distribution trends, suggested that the levels of Pb, Fe, and Mn were continuously decreasing over the study periods and that such trends were statistically significant. In addition, the results of correlation analysis finally confirmed that relationship among those metals is obvious and that their distributions are closely linked, at least under the environmental conditions of Won Ju area. Based upon similarities between Pb and soil-based metals like Mn and Fe with most respects of distribution behavior (as well as a line of evidence detailed in this study), it is concluded that the airborne Pb levels are to be maintained via such processes as re-emission of surficial soil-deposited Pb into the atmosphere of Won Ju city.
Origin and Evolution of the Cretaceous (Valanginian-Albian) Sukhodol Sedimentary Basin in South Primorye, Russia.
Journal of the Korean earth science society, volume 18, issue 3, 1997, Pages 198~198
Six formations of non-marine and marine sequences accumulated in lower stratigraphic level of the Partizansk-Sukhodol basin which was formed during Valanginian-Cenomanian. The sequences are bounded on east side by two NNE-striking mega faults. They are Partizansky and Central Sikhote-Alin fault which are sinistral strike-slip fault. Boundaries of the basin where six formations were deposited during Valanginian to Albian times were defined by the open to gentle E-W trending flexures which were developed by N-S compressive stress. The formations were formed by one tectonic movements and are unconformably overlain by upper sequences. Relationships between formations can be explained by lateral sedimentary facies change and by crustal subsidence from strike-slip faulting. Based on the genetic and tectonic study, we propose a new sedimentary basin named Sukhodol basin which accomodates six formations Valanginian-Albian age.
The Variability and Inter-Relationship of Climate Variables in Urban Stations of Korea
Gwak, Jong-Heum ; Kim, Hui-Su ;
Journal of the Korean earth science society, volume 18, issue 3, 1997, Pages 207~207
In order to survey the long-term change of climate variables in the 5 urban stations of Korea, the linear trend and singular spectrum analysis are applied to the five station data. In many urban stations, the trend was detected under the confidence level from 0.01 to 0.0001 in all of variables except precipitation. The most strong warming signal appeared in the minimum and mean temperature of all of stations, especially in Seoul. In the 3 urban stations among the 5 stations, we found the strong negative trend for relative humidity and the positive trend for water vapor pressure. And we also found the strong positive correlation between mean temperature and water vapor pressure in all of stations. It means that the increase of mean temperature makes water vapor to be increased in the lower atmosphere. In the mean time, the first mode of duration of sunshine shows the negative trend in all of stations. The second oscillation mode of duration of sunshine have the same phase in all of stations with time scales of about 20 years.
Comparative Studies on Geophysical and Environmental Geologic Characteristics of Volcanic Islands: Cheju Island and Hawaiian Islands
Gwon, Byeong-Du ;
Journal of the Korean earth science society, volume 18, issue 3, 1997, Pages 217~217
The geological, geophysical and hydrogeological studies achieved on Hawaiian islands and Cheju Island are reviewed to compare the structure and tectonic setting, the history of eruptive activity, and behaviour of the ground water of volcanic islands. Since the active volcanoes such as Kilauea, Mauna L,oa Volcanoes and Loihi Seamount have served as unique natural laboratories for the study of volcanic phenomena, the tremendous scientific accomplishments ab ut the Hawaiian volcanoes would provide invaluable information to understand the characteristics of the volcanism which produced the volcanic islands of our country and to set up the direction of future researches on these islands. Wilson (1963) originally proposed the hot spot hypothesis for the origin of the Hawaiian and other volcanic island chains. Geophysical models for the Hawaiian hot spot tend to be highly generalized and difficult if not impossible to test. Although many intriguing and clever ideas have been advanced, none has yet been advanced that satisfactorily explains all of the geometric, kinematics, physical, and chemical observations from the Hawaiian-Emperor Chain. Some geologists have suggested that the volacnic rocks of Cheju Island are mantle hot-spot origin, but the deep subsurface structure of the island has not thoroughly been investigated yet. The MT and Schlumberger electrical depth sounding data obtained in the eastern part of the Cheju Island provide valuable information about the basement structure and occurrence of both high level and basal ground water. Since the establishment of seismic network to look for the any possible magma chambers under the Cheju Island is relatively expensive, more detailed MT surveys all over the island are recommended with first priority to collect any geophysical evidences to support the hot spot origin of the Cheju Island.
Marine Environmental Changes and Paleoproduction During the Last Glacial and Interglacial Period
Hyeon, Sang-Min ;
Journal of the Korean earth science society, volume 18, issue 3, 1997, Pages 238~238
The paleoproduction changes including global environmental changes in the field of paleoceanography are reviewed to explain global atmospheric CO₂ changes during the last glacial and interglacial periods. Organic carbon content, organic biomaker and the barium content of the sediments were used to estimate the change of paleoproductivity and the results are discussed here. Because the organic matter and several inorganic phase in the ocean are tightly linked with each other, it is not suitable to estimate paleoproductions by only one mechanism, but several mechanisms should be used together. In order to understand the ocean environmental changes and its significance to global environmental changes during the glacial to interglacial period, more study on paleoceanography is still needed. Especially, study on change of ocean interia, the productivity change, the deep water circulation, the change in chemical composition of the sediment and the role of trace elements with respect to organic material flux and sediment accumulation may be considered essential factors in understanding global and ocean environmental change.