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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
A Study of Causal-Relationship Between Variables in Science Teaching-Learning Process
Journal of the Korean earth science society, volume 18, issue 4, 1997, Pages 251~251
The purpose of this study is to construct a structural equation model and to analyze causal relationships among variables consisting Science Teaching-Learning Process using structural equation modeling (SEM) with LISREL Ⅷ. The sample consisted of 483 10th grade boys from a general high school in Pusan, Korea. Three competing models consisted of five latent variables (scientific thinking ability, science inquiry skill, attitude towards science, scientific attitude, science achievement)-IP (inquiry preceding) model, AP (attitude preceding) model and AM (attitude mediating) model-were developed. Among these competing models, IP model satisfied the observed data sets. The causal relationships among "attitudes to science" and other latent variables were reliably identified. This study suggests that inquiry based teaching-learning processes should be offered to students for improvement of science achievement. At the same time, it seems to be important to develop positive attitude towards science. Understanding of relationships among variables related to attitudes to science will be helpful to the development of science curriculum and to the design of science teaching and learning process.
Sedimentologic and Mineralogic study in Surface Sediment off Biin Bay, West Coast of Korea
Lee, Hyeon-Bok ; O, Jae-Gyeong ; Kim, Seung-U ;
Journal of the Korean earth science society, volume 18, issue 4, 1997, Pages 259~259
Sedimentologic and mineralogic characteristics of 168 surface sediments are studied in order to evaluate economic deposits off Biin Bay, west coast of Korea. Bathymetry map shows that the seafloor is monotonous except for irregular rocky bottom. The bottom sediments are classified into five types following Folk's scheme (1968); sand, slightly gravelly sand, slightly gravelly muddy sand, muddy sand and silty sand. Most sediments (av.
: 3.36ø) are composed of fine sands and are well-sorted (av.
: 0.80ø). Average heavy mineral contents are 1.69% with mean contents of monazite and zircon of 0.50% and 2.25%, respectively. These two heavy minerals are calculated from rare earth elements data. Average heavy mineral contents of study area are lower than those of other areas in Yellow sea and Keum estuary. Low concentration of heavy minerals and fine sandy sediments indicate that this study area has been effected by low energy of tidal current and wave action. Fine sandy sediments may be transported from offshore. Economic value of placer is considered to be low in this study area.
Spatial Distribution Patterns of Nonmarine Trace Fossil, Diplocraterion luniforme, from the Hasandong Formation (Cretaceous) of Jinju Area, Kyeongsangnamdo, Korea
Journal of the Korean earth science society, volume 18, issue 4, 1997, Pages 267~267
The spatial distribution patterns of trace fossil, Diplocraterion luniforme, from floodplain lake deposits of the Cretaceous Hasandong Formation of Jinju area, Korea were statistically analyzed by using distance method through T-square sampling procedure in six quadrats. The ratio between expected square of point to nearest individual distances and one-half the expected square of T-square nearest-neighbor distance and index of spatial pattern indicate that populations of Diplocraterion luniforme exhibit clumped patterns in five quadrats and random pattern in one quadrat. The substrate condition of the floodplain lake environment seems to be one of controlling factors for spatial distribition patterns of suspension-feeding producers of Diplocraterion luniforme. The heterogeneously-firm substrate condition formed by subaerial exposure of generally-uneven substrate of shallow lake probably caused mostly-clumped distribution pattern of trace fossils.
Seasonal Vertical p-Velocity Estimated from the Satellite Data and General Circulation Model Analysis
Yu, Jeong-Mun ;
Journal of the Korean earth science society, volume 18, issue 4, 1997, Pages 276~276
A formula to estimate the vertical p-velocity (ω) is derived from satellite brightness temperature data of the MSU Channel 1 at 50.3 GHz (
) and Channel 2 at 53.74 GHz (
) which have been observed by the Microwave Sounding Unit (MSU). The formula has been formed by comparing outputs from two general circulation models of the Goddard Laboratory for Atmospheres (GLA GCM) and the European Center for Medium Range Weather Forecasts (ECMWF) with 9-10 years of microwave data. Here monthly values of the GCM outputs and satellite data which have been zonally averaged again are compared with each other. The location and intensity of Intertropical Convergence Zone (ITCZ) and South Pacific Convergence Zone (SPCZ) has been inferred from the comparison of the vertical p-velocity and the correlation coefficient between
, related to the effect of hydrometeors. Possible utilizations of satellite data for the improvement of GCM have been also examined. In order to evaluate the effect of hydrometeors on the brightness temperature over land, a radiative transfer model is utilized to simulate the observation of the
. The high correlation (0.97-1.00) between the two temperatures occurs over land due to high surface emissivity (ε=∼1.0), compared to over ocean (ε=∼0.5). The reason is that the extinction due to hydrometeors over land causes the decrease in brightness temperatures of both channels. These results imply that brightness temperature of the two channels on land can be alternatively available for analyzing global warming, highly related with the surface temperature. If satellite data compensates for the analysis of GCM, more precise simulation for the convective and subsiding areas existing in a dynamical atmospheric circulation can be expected.
Petrochemistry of the Cretaceous Gabbroid in Southeastern Korean Peninsula (Ⅰ): - with special reference to the Mt. Bangga, Yeongcheon-
Yun, Seong-Hyo ; Go, Jeong-Seon ;
Journal of the Korean earth science society, volume 18, issue 4, 1997, Pages 292~292
A small gabbroic intrusion (1.4 ㎢) emplaced into the Cretaceous sedimentary rock(Banyaweol Formation), are exposed in the Mt. Bangga area, Yeongcheon-gun, Kyeongsangbuk-do. The modes of occurrence and petrographic features have been described in some detail. New chemical analyses are presented for 14 gabbroic rocks, four biotites and eleven olivines. On the basis of normative PI-OI-Px diagram, the gabbroid plots from leucogabbro to leucotroctolite through mainly leuco-olivine gabbro. The gabbroids show medium- to coarse grained equigranular texture, and partly show orbicular structure which composed of leucocratic proto-core of plagioclase and olivine, and layering marked by alternation of mafic and felsic minerals. The gabbroids are characteristically rich in
CaO and MgO, and relatively poor in
compared with average chemical composition of gabbro.
, Sr, Ba, Rb and Zr contents increase with decreasing MgO contents, while Fe0 and Cr contents decrease. The variation of major elements and trace elements show the differentiation of the gabbroic magma, which belongs to transitional series which overlap part of the fields of alkali and tholeiitic gabbro. Hense, a high-alumina basalt magma with normative olivine is assumed as a primary magma. Tectonic discriminant diagram suggests volcanic arc for the gabbroic rocks in this area.
Geomorphic Analysis on the Construction of Kyung-Bu and Gu-Ma Inland Canal
Journal of the Korean earth science society, volume 18, issue 4, 1997, Pages 303~303
Recently Europian advanced countries are very much interested in inland canal as a transportation of mass goods in order to survive in struggles for trade rival. The advantages of the inland canal are low environmental pollution and low transport cost. Korea also needs to construct the inland waterway system because goods transport cost occupied up to 17% of total production cost. In Korea the inland waterway system could be completed by construction of Kyungbu and Kooma inland canal connected directly to outer sea. In this paper topographical analysis of Kyungbu and Kooma canals have been carried out as one of basic researches of the construction of those canals. The construction exerts an important affect on nation's economy. First, the direct effect is to utilize the income from aggregate gathering as financial resources of the construction of the canals. Second construction of support water dam an upper stream and tributary let us to central water resources. Thus we can avoid flood or drought and supply living and industry water on schedule. Third, the magic mass transportation system will be changed from the expensive ground transportation to the less expensive transportation. Fourth, this construction will induce to develope the back regions of Kangwon, Choongbuk and Kyungbuk areas. Therefore we can expect balanced development in all our the country. Fifth, In order to maintain the Han-Nakdong canal it is required to concentrate the stream management or conservation. Therefore the environmental conservation will be controlled more effectively.
A Simulation Study on the Optimum Array of Seismic Method to Investigate Fracture Zone
Seo, Baek-Su ; Son, Gwon-Ik ; Min, Dong-Ju ;
Journal of the Korean earth science society, volume 18, issue 4, 1997, Pages 312~312
Fractures in rocks are closely related to the physical properties such as hydraulic conductivity, mechanical stiffness and attenuation and/or delay of seismic waves. Detection of orientation and thickness of fracture zones has been a major topic of interest, particularly, for the investigation of oil and geothermal resources. In this study, optimum arrays in the seismic method are investigated by conducting a computer simulation through theoretical fracture models. Finite element method is used to calculate the traveltime, and geotomographycal inversion is conducted using ART, SIRT and LSQR method.
Oxidation of Pyrite by the Iron Bacteria Thiobacillus Ferrooxidans
Park, Cheon-Yeong ; Jeong, Yeon-Jung ;
Journal of the Korean earth science society, volume 18, issue 4, 1997, Pages 321~321
By Iron Bacteria Thiobacillus ferrooxidans (ATCC 19859), the bioleaching of pyrite ore in shaker using mixed cultures has been studied. Ore microstructural analysis using X-ray diffraction, SEM and EDS permitted us to know the nature, distribution, size and morphology of pyrite after bioleaching. In SEM analysis, pyrites show needle and columnar shapes of pyrite, corrosion area on the surface of pyrite expanded with leaching time. Selective bioleaching in pyrite surface were confirmed by the XRD analysis. Temperature is one of the variables that has most influence on the metallic extraction processes and bioleaching. Different tests were performed with mixed cultures at 20, 30, 40 and 50℃. The maximum content of ferric ion were obtained with a temperature at 30℃ and that of ferrous ion was a temperature at 50℃.
Structure and Physical Properties of the Mid-west Crust of Korea (Ⅲ): Paleomagnetism of the Cretaceous Volcanic Rocks in the Southern Choogaryong Rift Zone
Kim, Gwang-Ho ; Song, Mu-Yeong ; Jeong, Ji-Gon ; Kim, Won-Sa ;
Journal of the Korean earth science society, volume 18, issue 4, 1997, Pages 332~332
The extension of the so-called Choogaryong Rift Zone to NNW direction from Seoul and the geotectonic characteristics of the Zone were investigated using paleomagnetic techniques. Eighty six paleomagnetic samples from 19 sites were collectd from the Cretaceous volcanic rocks distributed from Seoul to Daechon. Thermal or alternating field demgnetizations, aided by principal component analysis, yields 13 sites with stable both normal and reversed directions, and 6 sites indicating transitional fields. Combining this result with the previous paleomagnetic and K-Ar age data, it is inferred that the volcanic rocks of this study were extruded or intruded during normal-transitional-reversed fields which prevailed in and around 83 Ma. This inferrence leads to the conclusion that the Choogaryong Rift Zone could be extended to Daechon, Chungnam Province. Both normal and reversed directions in the Rift Zone show NNW and SSE declinations. Mean directions of the normal and inverted reversed sites has NW declination (D/I=327.7°/45.5°,
=7.6°). Comparison with the expected direction in Korea indicates about 40° anticlockwise rotation of the Rift Zone, which was resulted from left-lateral fault movement since the formation of the Rift Zone.
Classification and Evolution of the Cetacea
Journal of the Korean earth science society, volume 18, issue 4, 1997, Pages 339~339
Classification and evolution of the Cetacea were reviewed. Modern cetacea are classified into Suborder Odontoceti and Suborder Mysticeti. With various classifications, Odontoceti is classified into 8 Families 34 Genera 66 Species. Mysticeti is classified into 3 Families 5 Genera 10 Species. The oldest whale belonging to the Genus Pakicetus, Family Protocetidae, Suborder Archaeoceti appeared from a carnivore belonging to the Family Mesonychidae in the latest Early Eocene deposits in Pakistan. Modem whales appeared in the Early Oligocene Epoch.