• Bulletin of the Korean Space Science Society
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• 2000.10a
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• pp.93-93
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• 2000

No Abstract, See Full Text

• Journal of the Korean earth science society
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• v.18 no.6
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• pp.473-479
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• 1997

The purpose of this study is to analyze the effects of STS program in Earth Science instruction on science-related attitude and scientific achievement of high school students. The students were divided into an experimental group and a control group. The experimental group was taught by the STS program and the control group was taught by the conventional lecture. The science-related attitudes have been improved in the experimental group more positively than in the control group. The experimental group showed a higher improvement in scientific achievements than the control group.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 2004.09a
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• pp.113-114
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• 2004

In order to classify the groundwater recharge characteristics in an urban area, a time series analysis of groundwater level data was performed. For this study, the daily groundwater level data from 35 monitoring wells were collected for 3 years (Fig. 1). The use of the cross-correlation function (CCF), one of the time series analysis, showed both the close relationship between rainfall and groundwater level change and the lag time (delay time) of groundwater level fluctuation after a rainfall event. Based on the result of CCF, monitored wells were classified into two major groups. Group I wells (n=10) showed a fast response of groundwater level change to rainfall event, with a delay time of maximum correlation between rainfall and groundwater level near 1 to 7 days. On the other hand, the delay time of 17-68 days was observed from Group II wells (n=25) (Fig. 1). The fast response in Group I wells is possibly caused by the change of hydraulic pressure of bedrock aquifer due to the rainfall recharge, rather than the direct response to rainfall recharge.

• Journal of the Korean Society of Earth Science Education
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• v.2 no.1
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• pp.23-32
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• 2009

e-PBL based on constructivism adopted PBL(Problem Based Learning) and WBI(Web Based Learning), and it becomes the advanced model of instruction to be achieved PBL on-line. In this thesis, I applied e-PBL to 'the changing weather' part in the high school earth science I, compared to the lecture centered instruction, and analyzed how it affected on. On the basis of these, this study predicts the applicability on the cooperative learning and self-directed learning in the high school and suggests the improving of the teaching-learning with the results. The following shows the conclusion with as the central result of research. Firstly, the instruction applied e-PBL proved more effective academic achievement than the lecture centered instruction. Secondly, the instruction applied e-PBL proved more effective on the improving self-directed learning ability. Thirdly, the instruction applied e-PBL proved more effective self-efficacy than the lecture centered instruction.

• Journal of the Korean earth science society
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• v.34 no.5
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• pp.428-434
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• 2013

In this commentary, I examined the implications of Existentialism for science teaching and teacher education. Existentialist thoughts and premises can be used to explore the human element in an educational system. Before emphasizing the pragmatic and technical aspects of teaching, we need to rethink why we teach and recognize our learners as unique beings in a continual process of becoming. By incorporating the existential perspective into curriculums and pedagogies of science education, we can help learners to make their existences and experiences meaningful. This paper consists of three parts. In the first part, I drew on relevant aspects of Existentialism and its implications on the views of the learner. In the second part, I examined the competency-based curriculum in light of Existentialism. Existentialism aims, in part, to develop an educated person who possesses a clear sense of personal identity, a critical attitude, and the inclination to be a life-long learner, and so on. These characteristics are consistent with the implications developed from the competency-based curriculum. In the third part, I explored pedagogical activities consistent with existentialist thinking the ultimate goal of which is to create authentic individuals who can take responsibility for being humans. In the conclusion, I discussed how existentialist ways of thinking and teaching call for the science teacher's reflective practices, where the teacher needs to integrate personal and professional knowledge as the situation demands.

• Journal of the Korean earth science society
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• v.36 no.7
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• pp.643-648
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• 2015

Equations that could estimate the local magnitude of historical earthquakes, being difficult to calculate, in Sino-Korea craton was obtained using instrumental earthquake data for 22 Korean and 46 northeastern Chinese events. The obtained equations from intensity $I_0$ is $M_L=1.7+0.57{\times}I_0$. The equation from felt area FA for the Korean Peninsula is $M_L=4.29-1.34{\times}log(FA)+0.28{\times}log^2(FA)$. When the information on earthquake damage, effects, and felt area is all recorded at the same time, the former equation of intensity is more feasible than that of felt area due to uncertainty in earthquake felt area.

• Bulletin of the Korean Space Science Society
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• 2008.10a
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• pp.31.4-32
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• 2008

The microwave instruments are used many areas of the space remote sensing and space science applications. The imaging radar of synthetic aperture radar (SAR) is well known microwave radar sensor for earth surface and ocean research. Unlike radar, microwave radiometer is passive instrument and it measures the emission energy of target, i.e. brightness temperature BT, from earth surface and atmosphere. From measured BT, the geophysical data like cloud liquid water, water vapor, sea surface temperature, surface permittivity can be retrieved. In this paper, the radiometer characteristics, system configuration and principle of BT measurement are described. Also the radiometer instruments TRMM, GPM, SMOS for earth climate, and ocean salinity research are introduce. As first korean microwave payload on STSAT-2, the DREAM (Dual-channels Radiometer for Earth and Atmosphere Monitoring) is described the mission, system configuration and operation plan for life time of two years. The main issues of DREAM unlike other spaceborne radiometers, will be addressed. The calibration is the one of main issues of DREAM mission and how it contribute on the space borne radiometer. In conclusion, the radiometer instrument to space science application will be considered.

• Journal of Powder Materials
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• v.25 no.3
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• pp.213-219
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• 2018

We report a method for preparing rare earth oxides ($Re_xO_y$) from the recycling process for spent Ni-metal hydride (Ni-MH) batteries. This process first involves a leaching of spent Ni-MH powders with sulfuric acid at $90^{\circ}C$, resulting in rare earth precipitates (i.e., $NaRE(SO_4)_2{\cdot}H_2O$, RE = La, Ce, Nd), which are converted into rare earth oxides via two different approaches: i) simple heat treatment in air, and ii) metathesis reaction with NaOH at $70^{\circ}C$. Not only the morphological features but also the crystallographic structures of all products are systematically investigated using field-emission scanning electron microscopy (FESEM) and X-ray diffraction (XRD); their thermal behaviors are also analyzed. In particular, XRD results show that some of the rare earth precipitates are converted into oxide form (such as $La_2O_3$, $Ce_2O_3$, and $Nd_2O_3$) with heat treatment at $1200^{\circ}C$; however, secondary peaks are also observed. On the other hand, rare earth oxides, RExOy can be successfully obtained after metathesis of rare earth precipitates, followed by heat treatment at $1000^{\circ}C$ in air, along with a change of crystallographic structures, i.e., $NaRE(SO_4)_2{\cdot}H_2O{\rightarrow}RE(OH)_3{\rightarrow}RE_xO_y$.

• Journal of The Korean Association For Science Education
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• v.29 no.8
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• pp.951-962
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• 2009

Examining research papers and other texts on the subject, this study summarizes previous studies, with focus on circulation as a subtopic of Earth Systems Education. In relation to the Earth Systems unit included in the revised 10th-grade science textbook, this study explains the meaning of Earth Systems and the basic concepts of Earth System Science. It surveys the origin and application of Earth Systems Education, which developed primarily in the U. S., and introduces its objectives, concepts, and communicated content. It also reviews the contents of Earth Systems Education adopted in the Korean school curriculum, and provides a comparative analysis of the content on circulation appearing in Earth Science I textbooks. Finally, it is proposed that an understanding among educators of Earth Systems and of its necessity as a subject of education is imperative for Earth Systems Education to become firmly established as a compulsory component of the national school curriculum.

• Bulletin of the Korean Space Science Society
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• 2008.10a
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• pp.28.1-28.1
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• 2008

Detection of spectral bio-signatures from extra terrestrial planets has received an increasing attention from the astronomy and space science communities in recent years. In an attempt to better-understand disk averaged spectra of the only know terrestrial planet i.e. Earth, we are constructing a scale-able 3D earth model with surface reflectance and scattering properties. The USGS coastal line data were used to form coastal line segments and they were then stitched to generate continuous coastal lines to represent major continents and large islands. As the first stage of model verification, wavelength dependent ocean and land reflectance data and scattering characteristics were defined over the land and sea surfaces respectively. We then performed ray tracing based imaging and radiometric transfer simulations using a hypothetical optical payload receiving the reflected and scattered sun lights from the earth. The model concept, computational details, the simulation results are discussed as well as the future development plan.