• The Journal of the Petrological Society of Korea
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• v.27 no.2
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• pp.73-84
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• 2018

In the northern Cheongsong, there are occurred igneous intrusions: Cheongsong dike swarm, Jungtaesan laccolith, Galpyeongji stock. The swarm is composed of rhyolitic dikes that have developed many various spherulites. The dikes represent an geometrically radical pattern centering the Galpyeongji stock, but also geochemistry of the intrusions indicate the swarm source. Here we report the compositional data for 28 samples from the three intrusions. All of the intrusions belong to rhyolitic composition, but according to compositional correlation, there are considerable overlaps between intrusion compositions. In particular, the Cheongsong dike swarm is divided into several dike groups by rock color and shows compositional diversity, but the composition of the dikes generally overlap with compositions of other intrusions. The Jungtaesan laccolith is enriched in alkali, $K_2O$ and $Al_2O_3$ and depleted in $Fe_2O_3{^t}$, $TiO_2$ and REE compared to the Cheongsong dike swarm. In contrast, the Galpyeongji stock is narrow in composition range, and commonly has sharp compositional overlaps with the Cheongsong dike swarm. According to the compositional correlations, the stock is considered to be a source of the swarm and it is connected to an episode of volcanism.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.32 no.10
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• pp.53-59
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• 2004

A calibration technique for a redundant IMU with low-grade inertial sensors is proposed. In order to calibrate the redundant IMU that can detect and isolate a faulty sensor, the fundamental coordinate frames in the IMU are defined and the IMU error is modeled based on the frames. Equations to estimate the error coefficients of the redundant IMU are formulated, and a test sequence using the 2-axis rate table is also presented. Finally, a redundant IMU with cone configuration is implemented using the low-grade inertial sensors and the performance of the proposed technique is verified by some experiments.

• Journal of Wetlands Research
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• v.13 no.1
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• pp.95-104
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• 2011

This study was implemented to select the suitable site for Palustrine Wetland at habitat restoration for Oriental stork, red species and top-level predator in ecosystem. The evaluation items was fitted by review the antecedent studies on the suitable site selection model and evaluation items of wetland. The study sites were setted in $5,884,800m^2$ area including Yesan-gun Dae-ree, in which Oriental stork' park will be located, through DEM(Digital Elevation Model) watershed analysis. The thematic map by valuation items with secure of water resource, soil, topography, distance between roads, houses, etc., land using, wildlife corridor, and type of water resource was prepared using GIS program. The sites with high evaluation score were selected as suitable creation sites for wetland through overlapping those maps. Total 8 sites with over 18 point were selected. The characteristics of selected sites show that the soil are consisted of clay, the connectivity is valued high with surface water, the slope are gentle, and the connectivity is good with surroundings ecosystem. The result of water quality analysis, which was implement to survey available water resources and develop the solution of problem of water environment, showed that water quality at Salmok reservoir and Bogang reservoir is generally good, but the water quality at stagnant water body rising out from groundwater is not good. This study has limit to select the suitable sites of wetland only by analyzing physiotherapy environment in study area. Hereafter, the study is need to examine closely enhancement effects of biological diversity through investigation of biotic environment.

• Proceedings of the Korean Society of Laser Processing Conference
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• 2006.06a
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• pp.77-81
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• 2006

• Journal of Bio-Environment Control
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• v.25 no.1
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• pp.1-8
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• 2016

This study was conducted to find the suitability site for the construction of Saemangeum horticulture complex taking into account cost-effective environmental management by analyzing and comparing meteorological conditions. By overlapping the thematic maps, we extracted the regions that scored 50-59 points as suitable sites for the development project. Of these pre-selected sites, we selected the final candidate region for the protected horticulture by overlapping the sites selected for agricultural and living environment construction. The results of this study will contribute to generating added values by minimizing the environmental management costs for horticulture and landscaping. The operation of a large-scale protected horticulture and landscaping in the Saemangeum Complex will enhance the agricultural competitiveness of our country in the global market.

• The Korean Journal of Nuclear Medicine Technology
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• v.21 no.1
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• pp.50-53
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• 2017

Purpose The change in uniformity due to the decreasement in dose should be known. $^{57}Co$ sealed sources are easy to manage and use as QC sources replacing $^{99m}Tc$. Overlapping sealed sources are expected to show variations in dose due to attenuation between sealed sources. Materials and Methods A total of three experiments were conducted. The first experiment is to observe the change in the degree of senescence of the $^{57}Co$ sealed source. The second experiment is to compare the single source and overlaped source at similar doses. In the third experiment, the sources of different doses were compared on each other to determine the changes due to the attenuation between the overlapping sources. Results The results of the first experiment did not exceed the acceptable range. but each crew showed a difference. There was no statistically significant difference in the measurement of uniformity on second and third experiment Conclusion It is believed that a $^{57}Co$ sealed source can be used as a superimposed source. It is not only economical but also convenient to use. daily uniformity measurements will help reduce scan time and speed up the testing process.

• Spatial Information Research
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• v.3 no.2
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• pp.161-177
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• 1995

본 연구의 목적은 도시공원 조성시 물리.생태적 여건과 이용을 고려해 건강한 도시공원을 조성하는데 기초자료를 제공하는데 있다. 따라서 본 연구는 서울 서초구 양재시민의 숲(공원)을 대상으로 조성된 공원의 물리.생태적 여건과 이용의 관련성을 조사해 나타난 문제들을 GIS와 설문조사를 통해 분석했다. 조사항목으로 과거토지이용, 현토지이용(성토지역, 동선, 나지, 시설물), 식생(수고, 지하고, 최근색재지, 유실수, 불량식재지), 배수상태, 야간조명, 소음, 이용현황(이용밀도, 이용행태, 접근동선) 등이며 수고+소음, 지하고+이용밀도, 과거토지이용+배수불량, 이용행태+접근동선 등을 중첩해 문제점을 분석했다. 그 결과 본 공원은 식재, 배수, 소음, 이용(주차, 야간이용)등의 문제를 앉고 있으며 이에 대한 해결방안으로는 숲내 공지확보, 수로나 연못설치, 방음벽 설치, 주차장 확보 등이다. 설문조사에서 제안된 시설과 대안으로는 공원주변의 양재 화홰단지와 연계한 화단 및 화훼전시공원(43%), 현공원의 잠재력을 활용한 식물원 혹은 수목원(58%), 과일나무 공원(32%) 등을 들 수 있다. 결과적으로 이공원과 같이 규모가 큰 공원을 조성시에 위와 같은 문제들을 해결하기 위해서는 조성기간중 다양한 문제를 수용할 수 있는 유연한 단계별 계획이 필요할 것이다.

• Proceedings of the Korean Information Science Society Conference
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• 1999.10b
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• pp.336-338
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• 1999

본 논문에서는 사회 학습의 이론의 하나인 관찰 학습 이론에 기반한 네트웍 앙상블을 위한 관찰 학습 알고리즘을 제안한다. 하나의 네트웍이 학습할 대 함께 학습되는 다른 네트웍들을 이용하여 가상 데이터를 생성하여 학습에 이용하므로써 데이터가 부족한 경우 네트웍이 과학습 되는 것을 방지고 각 네트웍의 일반화 성능을 향상시키는 동시에 앙상블의 성능도 향상시킨다. 제안된 방법을 사인 함수의 근사 문제와 중첩된 두 정규 분포의 분류 문제에 적용하고 단일 네트웍, 네트웍 위원회, Bagging 알고리즘과 비교하여 제안된 방법의 일반화 성능의 우수성을 보였다.

• KDI Journal of Economic Policy
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• v.17 no.1
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• pp.127-144
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• 1995

통일기금의 목적은 현재의 소비를 줄이고 총저축(정부저축+민간저축)을 증가시키는 것이다. 그럼으로써 현재의 부(富)를 통일(統一)이 되는 시점으로 이전(移轉)시키고자 하는 것이다. 과연 이 목적은 달성될 수 있는가? 본 연구는 이에 대한 이론적인 분석을 시도하고 있다. 국채(國債)를 발행하여 조세의 부과시점(賦課時點)을 달리하더라도 경제주체의 소비수준은 변화하지 않는다는 주장이 있다(대등정리(對等定理), Ricardian Equivalence Theorem). 통일기금(統一基金)을 조성하는 것도 국채발행(國債發行)과 비교하여 부(富)의 이전방향(移轉方向)이 다를 뿐 징세시점(徵稅時點)의 변화라는 점은 동일하다. 따라서 대등정리에 의하면 통일기금의 목적은 달성될 수 없다. 조성된 통일기금만큼 민간 저축이 감소하기 때문이다. 그러나 통일기금에는 국채(國債)와 구별되는 두가지 본질적인 특징이 있다. 통일시점과 통일비용이 모두 불확실하다는 점이다. 이 두가지 불확실성은 미래의 가처분소득을 불확실하게 한다. 이와 같이 미래소득이 불확실할 때에는 대등정리가 성립하지 않는다는 것이 종래의 연구결과였다. 그러나 본고(本稿)는 2기(期) 중첩세대모형(重疊世代模型)(Overlapping Generations Model)을 이용하여 이 두가지 불확실성에도 불구하고 여전히 대등정리(對等定理)가 성립함을 보이고 있다. 즉 통일기금은 민간저축을 감소시키므로 총저축을 변화시키지 못한다.

• Journal of the Korean Magnetics Society
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• v.11 no.6
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• pp.272-277
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• 2001

A spin valve structure of Ta/NiFe/CoFe/Cu/CoFe/Ru/CoFe/FeMn/Ta which has a synthetic antiferromagnet (CoFe/Ru/CoFe), was fabricated by using a magnetron sputtering system. The thickness and composition of magnetic free and pinned layers affect the magnetic properties such as exchange interaction strength of each layer and so on. Even though Rutherford Backscattering Spectrometry (RBS) has advantages of quantitative and non-destructive analysis, it is almost impossible to determine the thickness and composition of magnetic thin films using lBS because of its poor mass resolution for a higher atom number (Z>20). In this study, quantitative analysis of the element composition and thickness for the spin valve sample was performed by combining both Proton Induced X-ray Emission Spectrometry (PIXE), which is one of element specific analysis techniques, and grazing-exit RBS with a highly improved depth resolution and absolute quantitative analysis. For the quantitative analysis, standardization of PIXE was carried out with NiFe, CoFe, and FeMn layers, which are one of constituent layers of spin valve films. Through PIXE standardization and the aid of PHE experimental results of the spin valve sample, ire overlapped signal in a grazing-exit RBS spectrum were successfully resolved and the thickness of the Ru layer was determined with a resolution of ∼1 .