• Economic and Environmental Geology
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• v.48 no.1
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• pp.51-63
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• 2015

I produced a secular variation model of geomagnetic field by using the magnetic component data from four geomagnetic observatories located in Northeast Asia during the years between 1997 and 2011. The Earth's magnetic field varies with time and location due to the dynamics of fluid outer core and the magnetic observatories on the surface measure in time series. To adequately represent the magnetic field or secular variations of the Earth, a spatio-temporal model is required. In making a global model, satellite observations as well as limited observatory data are necessary to cover the regions and time intervals. However, you need a considerable work and time to process a huge amount of the dataset with complicated signal separation procedures. When you update the model, the same amount of chores is demanded. Besides, the global model might be affected by the measurement errors of each observatory that are biased and the processing errors in satellite data so that the accuracy of the model would be degraded. In this study, as considered these problems, I introduced a localized method in modeling secular variation of the Earth's magnetic field over Northeast Asia region. Secular variation data from three Japanese observatories and one Chinese observatory that are all in the INTERMAGNET are implemented in the model valid between 1997 to 2011 with the interval of 6 months. With the resulting model, I compared with the global model called CHAOS-4, which includes the main, secular variation and secular acceleration models between 1997 to 2013 by using the three satellites' databases and INTERMAGNET observatory data. Also, the geomagnetic 'jerk' which is known as a sudden change in the time derivatives of the main field of the Earth, was discussed from the localized secular acceleration coefficients derived from spline models.

• Korean Journal of Crystallography
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• v.1 no.1
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• pp.35-48
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• 1990

본 연구에서는 포항-연일지역 및 감포-하서지 역의 점토광물과 주변모암의 열괭창 특성, 지구화 학적 및 물리적 특성. 그리고 성인에 대하여 고찰하였다. Ca계 몬모릴로나이트영역에 속함을 알 수 있다. 그러나 제올라이트는 뚜렷한 특징을 보이지 않는다. 점토질암석과 그 이외의 벤토나이트 및 제올라이트사이의 Sr. Cu, V. Li과 La의 함량에는 차이가 발견된다.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.32 no.2B
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• pp.131-137
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• 2012

River areas are classified as conservation, restoration, and recreation zones depending on engineers' opinions from their experiences at present. For conservation zones, almost all engineers have the same opinions because natural characteristics are considered for classification. However, it is difficult to decide a basis in classifying restoration and recreation zones in mixed areas by urban and rural streams. This study attempted to prove an application of a previous study (Song & Yoon, 2008) that suggested two classification techniques to classify conservation or maintenance zones, and reclassify maintenance zones into restoration or recreation zones. The suggested classification techniques of river zones were used to estimate 46 reaches of 20 urban streams, 47 reaches of 29 rural streams, and 48 reaches of 19 mountainous streams to achieve a purpose of this study. The conservation, restoration, and recreation zones were reasonably divided by results of the suggested techniques. A possibility that quantified criterion could be used to classify river zones was proven in this study.

• Journal of the KSME
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• v.34 no.5
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• pp.351-360
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• 1994

최근, 자동차에 대한 사회적 요구로서는, 기존의 안정성, 또는 노령 및 여성 운전자의 증가에 따른 운전의 용이성 확보 등과, 부가해서, 지구 환경문제 개선이라는 과제에 집중되고 있다. 지구 환경문제로서는, 여러가지를 열거할 수 있지만, 그 중에서 자동차와 직접 관련되는 것은 "지구의 온난화," "오존층의 파괴," "산성비," 또는 "자원의 재처리화" 등이라고 말할 수 있다. 이들의 해 결을 위해서 업계는 대체 에너지 차량의 개발, 기존 차량의 연비 개선, 부품 및 차량의 리사이 클링 기술개발 등에 총력 질주해야만 한다. 이들 과제의 많은 경우가 재료기술이 직접 관련되어 있으며, 어느 과제도 재료 문제와 연관되어 있지 않은 것은 없다. 이 글에서는 연비개선을 위한 경량화, 저공해 차량의 개발, 리사이클 기술 개발 등 총체적 환경 문제 대응을 위해서 재료기술이 어떠한 역할을 담당해야 하는지 살펴보기로 한다.대응을 위해서 재료기술이 어떠한 역할을 담당해야 하는지 살펴보기로 한다.

• KOMUNHWA
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• no.51
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• pp.97-110
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• 1998

• KOMUNHWA
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• no.48
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• pp.153-166
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• 1996

• Journal of the Korean earth science society
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• v.28 no.6
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• pp.673-685
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• 2007

The purpose of this study was to investigate Earth Systems Understandings (Mayer, 1991) and Earth Systems meaning generation reported by science-talented students who participated in a geological field trip. The eight (4 female and 4 male students) field trip reports were randomly selected among all the reports written by twenty eighth-grade students who joined Shiwha-Lake field trip in Korea. The three-step program, including preparation, field trip, and summary, was provided to the students in order to facilitate meaningful learning through outdoor teaming activities. Seven Earth Systems Understandings and thematic types (Keys, 1999) were used to analyze the reports. The results of this study indicated thai aesthetic views and stewardship toward the Earth, which were the most distinguishing characteristics in Earth Systems Education, were reflected on most of the reports. The results also showed that the students tried to represent their understandings in such a type as meaning extension, meaning enhancement, or meaning elaboration. Overall, many students used 'knowledge-telling' process with a long list of observations and facts, whereas a few students used higher-order 'knowledge-transforming' process by coordinating their findings with interpretations and reasoning in their writings.

• Proceedings of the KGS Conference
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• 2002.11a
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• pp.51-54
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• 2002

다국적 기업들에 의해 주도되고 있는 여러 다른 신흥공업국의 자동차 산업과 달리, 한국의 자동차 산업은 국내기업들의 주도하에 성장하여왔다. 정부의 민족주의적, 보호주의적인 산업정책을 바탕으로 몇몇 자동차 대기업들이 성장하여 국내에서 자동차의 생산과 시장에서의 유통을 지배하여 왔던 것이다. 하지만, 2000년 4월 프랑스 기업인 르노가 삼성 자동차를 인수하면서, 이러한 경향에 변화가 생기기 시작하였다.(중략)

• Proceedings of the KSEEG Conference
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• 2007.04a
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• pp.352-354
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• 2007

• Proceedings of the Korea Society of Design Studies Conference
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• 1999.10a
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• pp.24-25
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• 1999

근래 들어 소위 지구화 현상(Globalization)이 가속화되면서 문화가 새로운 경쟁적 우위의 수단으로서 자리잡아 가고 있다. 특히 냉전시대의 이데올로기가 종식되면서 문화는 모든 분야에서 중요한 하나의 화두로서 자리잡고 있는 실정이다. (중략)