• Economic and Environmental Geology
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• v.43 no.6
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• pp.543-553
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• 2010

This study was focused on the mineralogical and geochemical characteristics of field soil of the Baekje Kingdom from K wongbawigol site in Jeongdongri, Buyeo and whether the bricks from Songsanri Tombs and Muryung's Royal Tomb were made of soil from this site. Soil samples show the similar size fraction as a silt loam and acidic soil, whereas some samples have the enrichment of organic matter, P and S. Also, they have similar geochemical behavior of elements and similar mineral phases consisting of quartz, plagioclase, orthoclase, vermiculite, mica and kaolinite. The enrichment of iron oxide is found in some soil layer, including the iron oxide mottling and precipitation along plant roots and they are attributed to repeat oxidation and reduction environments due to flooding and drainage of field soil. It's anthropogenic alteration by human activity. Especially, it is assumed that the concentration of the iron oxides found in bricks from Muryung's Royal Tomb and Songsanri Tombs is the additional evidence that soil in this study is probably the raw materials of those bricks.

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2005.11a
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• pp.101-102
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• 2005

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2003.10a
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• pp.173-173
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• 2003

• Proceedings of the KGS Conference
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• 2003.05a
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• pp.56-59
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• 2003

한반도 남동 해안은 중부 동해안의 정동진 지역과 더불어 많은 지형학자들에 의해 해안단구 지형발달에 대한 연구가 이루어져 왔다. 대보에서 방어진에 이르는 해안에서 해안단구는 크게 고위면, 중위면, 저위면으로 나누어지며, 이들은 다시 고위 I (H I)면, 고위II(H II), 중위면, 저위 I(L I)면, 저위II(L II)면으로 세분되었다. 특히 연구지역에서 북북동쪽으로 약 22km 떨어진 경주시 감포읍 대본리와 나아리에서는 고위면보다 더 높은 해발고도에서 고고위 I(HH I)면, 고고위II(HH II)면이 확인되었다(황상일ㆍ정혜경ㆍ윤순옥, 2000). (중략)

• Proceedings of the Korean Institute of Resources Recycling Conference
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• 2003.10a
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• pp.170-173
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• 2003

Activated Rice-Hull carbon was developed to remove ammonia compounds in water matrix. Isotherm adsorption tests of ammonia were conducted using a bottle-point technique and column test. Residual ammonia after Jar-Test or passing through the column was determined by Indophenol method, and assessed the removal efficiency for ammonia of the adsorbent. As a result, the adsorption capacity for ammonia of activated racehull carbon was very larger than that of coconut shell carbon, because the rice hull carbon had the higher BET surface area of silicate. The activated racehull carbon is under the development as adsorbent to remove ammonia in drinking water and waste water.

• Proceedings of the KIEE Conference
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• 1998.07g
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• pp.2231-2233
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• 1998

본 논문은 손등의 정맥패턴을 이용한 개인식별을 위해 개발된 3가지의 알고리즘에 관해 각각의 성능을 비교한 결과를 제시한다. 세가지 방법은 각각 Unsharp Masking을 이용한 이치화 후 정맥과 손등 배경의 면적을 이용한 가중치를 적용한 원형정합 알고리즘[1]과 Kolmogorov Smirnov(KS) statistic[2]을 이용한 매칭 알고리즘을 개선한 방식, 그리고 정맥의 세선화 처리 후 분기점의 좌표, 정맥의 길이, 정맥 가지 사이의 분기각도 등의 특징벡터를 이용한 방법 등이다. 본 연구에서는 전처리 과정에 있어서, 원시영상의 혈관부위와 배경부위의 gray scale 분포가 겹친 상태에서 Unsharp Masking 필터링을 적용한 결과가 기타 다른 전처리 방식보다 우수하게 영상을 강화시킬 수 있음을 확인하였고, 가중치를 이용한 매칭방식이 다른 매칭방식보다 우수함을 확인하였다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2016.01a
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• pp.77-78
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• 2016

빅 데이터의 데이터 수집 및 분석 기술에 대한 연구는 컴퓨터 과학 분야에서 각광 받고 있다. 또한 소셜 미디어로 인한 대량의 비정형 데이터 분석을 요구하는 다양한 분야에 접목되어 효용성을 인정받고 있다. 그러나 빅 데이터 개념을 기반으로 하는 하둡과 스파크는 유즈케이스에 따라 성능이 크게 달라진다는 문제점이 있다. 이러한 문제점을 해결하기 위해 본 논문에서는 하둡의 맵리듀스를 줄이고 아파치 스파크를 이용한 빅 데이터 분석을 위하여 머신러닝 알고리즘인 K-Means 알고리즘을 이용하여 프로세싱 모델의 성능을 비교한다.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.16 no.3
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• pp.291-299
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• 2003

Based on the continuum approach, an investigation is made to get the forces and displacements of laterally loaded outrigger braced structures with a pair of coupled cores, and to show the effect of stiffening outriggers on the behavior of the structure. From the condition that the rotation of the core at the outrigger level is matched with the rotation of the corresponding outrigger, the outrigger restraining moment is derived analytically. From this, the core moment diagram, the column axial forces, and the horizontal displacements of the structure may be determined. Comparisons with the results by the program MIDAS-GEN for the structural models, have shown that this analysis can give reasonably accurate results for outrigger-braced structures with a pair of coupled cores. And a lateral displacement at the top of the structure is influenced by the outrigger location than the core location. Although the formulae are accurate only for idealized outrigger braced structures, they have a useful practical purpose in providing a guide to the behavior, and for making approximate estimates of the forces and displacements, in practical outrigger braced structures with a pair of coupled cores.

• Journal of architectural history
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• v.19 no.6
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• pp.61-78
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• 2010

Old Russian Legation(1890) has been attracted public attention in terms of politics and foreign affairs than architectural style because of conditions of location and historical incident. Though it was heavily damaged during the Korean war, and only the tower has been restored, it is very important in architectural history in Korea, because it is the oldest western style brick building which is existing with the old bishop's house in Myeong-Dong. But it has been impossible to reveal exactly the original form as there has been few reliable materials(picture, drawing, document) and it's remains were nearly destroyed owing to development of the surroundings. Recently the decisive document(site outline map) was found, and new research on the architect Sabatine was studied. So I can get into close with the original form by the results. In this study, I tried to conjecture the original form of the old Russian legation(the size, style, plan and indoor space, arrangement of attached facilities) and I checked the location and structure of the room where King Gojong stayed when he took refuge, and the use of the passage in the basement.

• The Journal of the Petrological Society of Korea
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• v.18 no.3
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• pp.211-221
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• 2009

This study illustrates the relationship between the petrographic characteristics of micrographic granite and the topographic features around Ijin-ri. Light-brown to light- gray granite is composed of intergrown fine-grained quartz + orthoclase, displaying micrographic textures. Miarolitic cavities are abundant. Many micro-landforms including tor, tafoni, and gnamma occurred in the micrographic granite of the study area. Tafoni is dominant in the north and gnamma is dominant in south. From our study of the occurrence and textural properties, two alteration zones were clearly identified; one is an external zone (A) characterized by abundant of small sized miarolitic cavities and the other is an internal zone (B) having them less than zone A. The former is dominant in north, and the latter is dominant in south. Particular geomorphologic features such as fluting cores and raised rims are present in the Ijin-ri area. This suggests that development of miarolitic cavities played an important role in the formation of the various geomorphologic features. Consequently, the petrogenesis of the micrographic granite is related to geomorphologic features in the external zone typified by abundant tafoni such as the tiger rock, and the formation of a platform as micro-landforms is influenced by thetextural differences of host rock in the internal zone.