• Economic and Environmental Geology
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• v.23 no.1
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• pp.81-86
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• 1990

Palemagnetic study on the Deadong Super Group in the Mungyong area has been carried out to obtain the direction of NRM and virtual geomagnetic pole(VGP), and to investigate geomagnetic stratigraphy and geotectonic evolution. Twenty eight core specimens from five sites in Dangog and Bongmyongsan Formations yield magnetically stable results by thermal demagnetization test. Mean declination and inclination of Dangog and Bongmyongsan formations are $52.4^{\circ}E$ and $-57.3^{\circ}$, respectively, which indicate reversal polarity. VGP is located at $1.2^{\circ}N$ in latitude and $269.4^{\circ}E$ in longitude, which is quite different from those of other contemporary formations in China. This suggests that the study area has suffered from differnt tectonic movement caused by Daebo Orogeny occurred in the Korean Peninsula during post-Daedong and pre-Kyongsang Systems. As compared VGP of Daedong Super Group in the Mungyong area with wordwide Mesozoic paleomagnetic polarity stratigraphy, it is correlated with the reverse Epoch in the Graham normal interval. This suggests that the time of formations of Dangog and Bongmyongsan is in the age of 190-195 my.

• Economic and Environmental Geology
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• v.23 no.1
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• pp.59-71
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• 1990

Magnetic anisotropy of a total of 213 independently oriented Tertiary rock samples from Pohang-Ulsan area has been studied. The sampled strata comprise basalts, tuffs and black shale, and range in age from Eocene to Miocene. The previous palaeomagnetic studies indicate that their magnetic carrier minerals are titanomagnetites. Among 23 sampled sites, 11 sites were found to preserve magnetic load foliation parallel to the bedding plane caused by the Iithostatic load of the overlying strata. Other 4 sites showed magnetic lineation indicating the flow direction of lava and tuffs. The remaining 8 sites revealed the magnetic tectonic foliation nearly vertical to the bedding plane. This magnetic foliation is interpreted to be generated by tectonic compression which acted nearly horizontally during the solidification stage of the strata. The compression directions deduced from the tectonic foliation of the 8 sites can be grouped into internally very consistent two group: a N-S trending one and the other WNW-ESE trending one. It is interpreted that the former N-S compression was associated with the N-S spreading of the East Sea(Sea of Japan) and the dextral strike-slip movement of the Yangsan-Ulsan fault system. The latter WNW-ESE compression is interpreted to represent the folding and reverse faulting activity in the Korean and Tsushima straits during middle/late Miocene times.

• Economic and Environmental Geology
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• v.31 no.4
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• pp.325-338
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• 1998

105 oriented samples (19 matrix samples, 86 cobble samples) were collected from the Silla Coglomerate Formation in Jinju and Goryeong areas to clarify the regional remagnetization of Cretaceous Kyongsang supergroup. Both the alternating field and thermal demagnetizations were conducted for the collected samples. The characteristic remanent magnetizations of these samples divided into three types in the Silla Conglomerate Formation: The ingredient magnetic minerals are magnetite, hematite, or both magnetite and hematite in a specimen. The characteristic remanent directions of cobble samples did not clustered to any direction. And the characteristic remanent directions of interbedded sandstones in the Silla Conglomerate Formation is $D/I=20.6^{\circ}/54.5^{\circ}$ (${\alpha}_{95}=11.1^{\circ}$, k=48.8) after tilting correction, agree with previous paleomagnetic studies on the Hayang group. These results implied that conglomerate test was passed indicating no regional remagnetization in the studied area after deposition of the Silla Conglomerate Formation.

• Economic and Environmental Geology
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• v.31 no.1
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• pp.45-52
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• 1998

Paleomagnetic data have been obtained from the Lower Triassic Tonggo Formation which is exposed in Tanyang area comprising the Pyeongan Supergroup in eastern Korea. Mean characteristic direction of the Tonggo Formation is declination/inclination=$121.4^{\circ}/-26.4^{\circ}$ (k=52.7, ${\alpha}_{95}=7.2^{\circ}$, N=9 Sites) and paleopole at longitude/latitude=$30.7^{\circ}E/33.3^{\circ}N$ ($dp/dm=4.2^{\circ}/7.8^{\circ}$). The mean direction passes reversal test and fold test at 99% confidence level. Therefore, it is inferred to be a pre-folding component. The paleopole position of this study is close to the Triassic pole positions of the North China Block; it is far from those of the South China Block. Therefore, a first order correlation between the Korean Peninsula and North China at least since Lower Triassic times is identified in this study.

• Economic and Environmental Geology
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• v.30 no.5
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• pp.451-458
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• 1997

The horizontal magnetic dipole as well as electrical dipole was adopted as a source to compute one-dimensional electromagnetic field behavior in controlled source magnetotellurics. he Cagniard impedances due to horizontal magnetic dipole source, especially phases, showed better frequency characteristics than those due to electric one. The magnetic dipole is inferior to the electric dipole in the point of relatively weak transmitting power at low frequency. But considering high resistivity charateristics of Korean geology, the magnetic dipole source is recommended for the survey up to depth of 500 m. A vector CSMT was introduced to get more reliable data in the area of two- or three-dimensional structures. A software and interpretation technique using polarization ellipses were developed. The technique was tested by synthetic data, which provided theoretical basis of the methodology. Although CSMT has inevitable limitation of investigation depth due to practically possible source-receiver separation, we proposed to use the technique developed in this paper where MT is not available, for example, in extremely noisy area or for shallow target.

• Journal of environmental and Sanitary engineering
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• v.24 no.4
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• pp.69-79
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• 2009

The purpose of this study was to identify the effect of Korean traditional dance exercise on physical health (BMI; body mass index, BP; blood pressure, VC; vital capacity, TC; total cholesterol, HDL; high-density lipoprotein, TG; triglyceride), self-efficacy and stress in elderly women. A quasi-experimental research design(one group pretest and posttest) was used for this study. Participants were recruited in a metropolitan city and a total of 43 community dwelling elderly women completed the 12-week Korean traditional dance exercise program. Descriptive statistics and paired t-tests were used in the data analysis by SPSS/WIN 12.0. After the Korean traditional dance exercise program there was a significant difference in BMI, VC, TC, HDL, stress and self-efficacy. There were, however, no significant changes in BP, and TG level after completing this program. This study suggests that Korean traditional dance exercise may be one of the effective nursing interventions for elderly women.

• Vending industry
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• v.8 no.3
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• pp.66-69
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• 2008

"자판기는 왜 네모나기만 하지?" "자판기는 왜 단순 물품판매 기능만 있는 거지? 다른 기능들이 있어도 좋을 텐데..." 단지 호기심어린 동심의 시각만이 아니더라도 이런 궁금증 한번 가져 봤을 법하다. "왜? 왜"하며 고개를 갸우뚱하게 만든다는 것은 그만큼 '블루오션'의 영역도 넓다는 얘기이다. 자판기의 경우 누구도 한계영역을 규정지어 놓은 것도 아닌데 '단순 물품판매 기능'에다 '획일적인 디자인'에 묶여 있는 게 보통이다. 새로운 시각으로 자판기를 다기능화하려는 선각자적인 시도들은 무모한 도전으로 규정지어지기 일 수이고, 이런 환경에서 자판기는 자기 복제만 되풀이 할 뿐 별다른 발전이 없게되는 상황에 이른다. 무궁무진한 아이디어 지향적이라는 특성을 장점으로 하는 자판기가 '단순 획일화'의 벽을 뛰어 넘지 못하는 게 안타깝다. 해법은 자판기 상상력이 충분히 발현될 수 있는 시장환경이 조성되어야 한다는 점이다. 지금 당장만 중시하는 단기적 시장논리로 자판기 가능성의 싹을 죽여 버리는 토양에서 혁신이 일어나기란 정말 힘들다. 이런 점에서 볼 때 금호에 소개하는 지문인식 광고 커피자판기가 시사하는 바가 크다. 핵심은 이제 이런 제품에 대한 관심이 높아졌으면 하는 점이다. 허무맹랑하다고? 사업리스크가 크다고? 이런 선입견을 가지고 새로운 가치를 원천적으로 차단해 버린다면 자판기는 항상 '그 모양 그 꼴' 일수밖에 없다. 새로운 시장을 만들고 발전시키는 것은 항상 무모할 것 같은 도전에서 나온다. 이번에 소개되는 지문인식 광고 커피자판기는 현재 한 개인의 사업모델이기는 하지만 새로운 미래형 자판기 트랜드가 될 수 있다는 점을 주목했다. 단지 개인의 발명차원의 사업모델을 소개하는 이유가 여기에 있다. 자판기의 새로운 가치를 찾고 영역을 확대한다는 측면에서 한번 머리를 '릴렉스'하게 해보자. 자판기 분야에 전혀 경험도 없지만 뜨거운 열정으로 지문인식 광고자판기를 특허 출원한 벤처 청년 황고연이 제시하는 "자판기 상상력"의 세계를 따라가 봤다.

• The Journal of Korean Association of Computer Education
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• v.19 no.2
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• pp.61-71
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• 2016

The purpose of this study was to identify problems of usability and to improve an interface in the digital textbook for leaner's leading to self-directed learning. To address those goals, the theory of affordance, which was related to affordance as leading to behavior, was applied for analyzing the user interface of digital textbook. Also, 10 students, 4th grade elementary school, were participated in the study. Participants were reported affordance's problems of digital textbook through Human Computer Interaction. As a result, some affordance's problems of the digital textbook were found out as follow; difficulty of page clicking, too small touch button, confusing the button, and, need to specific guidance. Based on the result, some suggestions were recommended to improve usability of digital textbook.

• Journal of the Korean GEO-environmental Society
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• v.11 no.10
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• pp.33-39
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• 2010

A self-organized nano-structured, photocatalytic $TiO_2$ membrane with large surface area of anatase crystallites was successfully fabricated by anodization. The nano-structured anodized $TiO_2$ membrane was characterized using EDX, SEM and XRD techniques and the effect of electrolyte type and concentration to fabricate $TiO_2$ metal membrane was also investigated. Regular nano tubular arrays were obtained By the EDX, SEM and XRD patterns, the anodized $TiO_2$ membrane showed the enhanced photocatalytic properties of anatase phase. Photocatalytic activities of fabricated $TiO_2$ metal membrane was also experimentally investigated as model compound of humic acid.

• The Journal of the Korea Contents Association
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• v.10 no.3
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• pp.463-471
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• 2010

The purpose of this study is to articulate learning model based on achievement level in blended learning environment. In order to investigate the variables and mechanisms in the blended learning environment, we started by attempt to develop two questionnaires using the components of web-based instruction and self-regulated learning. And its results were implemented to represent the topology and directed merging path within components. 154 students at a high school were required to take each web course respectively for two weeks. And questionnaires data, achievement levels data were collected and analyzed. Various statistical analysis methods such as correlation analysis, classical multidimensional scaling, multiple regression analysis, were applied to the data. As an result, the topology and directed path within factors of blended learning process were derived and revised as a final model.