중력장 해석으로 관측된 동두천 및 왕숙천 단층의 변위

최승찬,김성욱,최은경,신영홍 대한자원환경지질학회 2024 자원환경지질 Vol.57 No.1

추가령 단층대의 지구조적인 이동을 확인하기 위해 경기 북부와 양주 및 서울 지역을 통과하는 동두천 단층과 서울 동쪽 지역에서 북동-남서 방향으로 발달한 왕숙천 단층을 따라서 중력장을 측정하였으며 두 지역에서 약 1,100여 점의 중력 자료를 획득하였다. 두 단층대의 중력장 해석 결과는 다음과 같다. (1) 동두천 단층이 우향으로 약 3,000 m 정도 이동하였으며 이는 지질도에서 관찰되는 동두천 단층 일원 암석의 우향 이동 규모(2,900-3,100 m)와 일치한다. (2) 왕숙천 단층의 우향 변위는 약 3,200 m 이다. (3) 이를 종합하면, 추가령 단층대의 우향 변위는 평균 약 3,000 m 정도로 판단된다. 추가령 단층대의 변위를 좀 더 정확히 확인하기 위해서, 포천 단층, 경강 단층 및 인제 단층의 변위 정도를 파악하기 위한 중력 측정과 해석이 추가로 필요하다. To estimate the tectonic displacement of the Chugaryeong Fault System (CFS), gravity surveys were conducted along the Dongducheon fault (DF) and the Wangsukcheon fault (WF). A total of 1,100 stations for the DF and WF regions have been added to the current gravity database. The results of the gravity interpretation indicate that (1) the dextral displacement of the DF is about 3,000 m, similar to the tectonic displacement (2,900-3,100 m) shown in the geological map. (2) The dextral displacement of the WF is about 3,200 m. (3) Taken together, the tectonic displacement of the CFS is estimated to be about 3,000 m on average. To investigate more accurate tectonic displacement of the CFS, further gravity surveys is planned for the Pocheon fault, Gyeonggang fault, and Inje fault.

국내 건축자재에 대한 라돈 방출량 평가 연구

최승찬,조승연,김도현,김선홍,김민준,강경민,차동욱,복은정 한국냄새환경학회 2014 실내환경 및 냄새 학회지 Vol.13 No.4

Radon is an inert gas, and a naturally occurring radioactive material. Radon is produced by radium and uranium. Generated radon causes lung cancer through the inhalation. Therefore, If uranium contaminated soil is close toindoor spaces, residents may be exposed to this radioactive material(Radon). Generally, radon affects the firstto third floors of buildings. But our research team has often detected high radon concentration in the indoor airof high-rise apartments. The reason for this is that building materials containing uranium and radium are broughtinto apartments. This study was conducted an investigation into the radon emission rate of building materialsbeing used in South Korea. Also, our team conducted an investigation into the radon emission rate of gypsumtiles and concrete found in an apartment(17th floor apartment indoor radon concentration 5.03 pCi/L, Rad-7(DURRIDGECo.USA)). Finally, we investigated the radon emission rate of bricks containing the soil near auranium mine. The average radon emission rates of general building materials are as followings: (gypsum board :0.20·h-1/kg, gravel : 0.05, gypsum tile : 0.02, indoor tile : 0.08, general brick : 0.02, red clay tile : 0.02, concrete :0.11, uranium mine soil : 4.81). The results regarding the radon emission rate from a 17th floor apartment’s buildingmaterials are as followings: (gypsum board : 0.70, concrete : N/A). The results regarding the radon emission ratefrom bricks containing soil near a uranium mine was 0.19. This experiment indicates that gypsum boards showthe highest radon emission rate among general building materials. In particular, the radon emission rate from thegypsum boards in a 17th floor apartment was 3.5 times higher than general gypsum boards. Overall the resultssuggest that building materials that possess high levels of uranium emit more radon gas than any other materials. South Korea has not established legal regulations on radon emission from building materials. However, the resultsof this study strongly suggest that it is of the utmost importance to manage the radon emission rate of buildingmaterials and control their usage before construction.

활성단층의 3차원적인 규모를 결정하기 위한 중력장 데이터의 해석 및 지각구조 모델링: 양산단층에서의 예

최승찬,김성욱,최은경,이영철,하상민,Choi, Sungchan,Kim, Sung-Wook,Choi, Eun-Kyeong,Lee, Young-Cheol,Ha, Sangmin 대한자원환경지질학회 2021 자원환경지질 Vol.54 No.1

경상북도 포항시 냉수리 지역에 위치하는 양산단층의 수평 및 수직적 규모를 파악하기 위해서 단층을 동-서로 가로지르는 측선을 따라 중력장을 측정하였다. 그 결과, 단층 경계부에서 1.5 mGal의 뚜렷한 중력의 변화를 확인하였다. 이는 양산단층 서쪽과 동쪽의 지각 밀도가 서로 다르다는 것을 나타내며, 기존의 지질 및 지구물리 조사 결과와 비교해 보았을 때, 냉수리를 통과하는 양산단층은 서쪽의 불국사 화강암층과 동쪽의 경상계 퇴적암이 혼합된 파쇄대라는 것을 의미한다. 오일러 디콘볼루션(Euler deconvolution) 및 곡률 분석(Curvature analysis) 방식을 이용하여 파쇄대의 3차원적 규모를 확인한 결과, 깊이는 약 2,000 m이며, 남남서-북북동 방향으로 최소 약 3,000 m 정도 이어지는 것으로 파악되었다. IGMAS+ 소프트웨어를 이용한 지각구조 모델링 결과는 파쇄대 서쪽과 동쪽 지각의 밀도 차이가 약 0.1 g/㎤이라는 것을 보여주었다. 이상의 연구 결과는 중력장 데이터의 해석과 모델링이 지표면에 나타난 활성단층의 규모를 심부까지 파악 할 수 있는 매우 효과적인 방법이라는 것을 보여준다. 또한 지금까지 지표면을 중심으로 2차원적으로 수행했던 활성단층 지도 제작 사업의 영역을 3차원으로 확대할 수 있는 이상적인 수단이 된다. In order to estimate the vertical and horizontal structural in the Yangsan fault core line (Naengsuri area, Pohang), we carried out gravity field measurements and interpretation procedures such as Euler deconvolution method and curvature analysis in addition to the forward modelling technique (i.e. IGMAS+). We found a prominent gravity difference of more than 1.5 mGal across the fault core. This indicates a distinct density difference between the western and eastern crustal area across the Yangsan fault line. Comparing this gravity field interpretation with other existent geologic and geophysical survey data (e.g. LiDAR, trenching, electric resistivity measurements), It is concluded that (1) the prominent gravity difference is caused by the density difference of about 0.1 g/㎤ between the Bulguksa Granite in the west and the Cretaceous Sandstone in the east side, (2) the fault core is elongated vertically into a depth of about 2,000 meters and extended horizontally 3,000 meters to the NNE direction from Naengsuri area. Our results present that the gravity field method is a very effective tool to estimate a three -dimensional image of the active fault core.

압전센서 및 작동기를 사용한 박벽보의 진동억제

최승찬,김자환 한국항공우주학회 2004 한국항공우주학회 학술발표회 논문집 Vol.- No.-

중력이상 수치해석을 통한 연천지역 군발지진 원인분석

최승찬,김성욱,최은경,신영홍,홍태경 대한자원환경지질학회 2022 자원환경지질 Vol.55 No.6

Gravity data were analyzed to identify the cause of clustered seismicity that occurred intensively in Yeoncheon, located in the central part of the Korean Peninsula. Our analysis suggests that the En echelon faults developed in the northwest-southeast direction. In addition, in the eastern part of the Dongducheon Fault, it was interpreted that high-density lower bedrock intermittently lifts close to the surface due to vertical tectonic movement accompanied by a flower structure. The fracture zone of the Dongducheon Fault is estimated that the width is about 200 m, the depth is at least 5 km, and the density is about 15% lower than the adjacent rocks. It is analyzed that the shallow earthquakes that occurred within 5 km depth was concentrated along the low-density En echelon fault fracture zone developed between the high-density rocks intruding close to the surface. Therefore, the earthquakes can be interpreted as the result that the north-south stress caused by the dextral tectonic movement of the Dongducheon Fault activated the En echelon fault in the northwest-southeast direction.

유통경로에서의 가격경쟁이 유통전략에 주는 영향

최승찬 한국마케팅학회 1995 마케팅연구 Vol.10 No.2

지금까지 마케팅유통에서의 경쟁에 관한 연구는 제조회사의 입장에서 수직적 통합이나 중간상인과의 협력 등에 국한되어 왔다. 그러나 현재 구미의 시장에서는 거대한 소매상들의 발달과 함께 이들이 대부분의 상품시장을 장악하고 있는 실정이다. 이에 따라 유통구조간의 경쟁에 관한 많은 연구들이 진행 중이다. 우리 나라 유통시장의 개방과 함께 이러한 대형 유통체인들이 진출하게 되면 현재 제조회사 위주인 우리의 유통시장은 격변의 시대를 맞을 것으로 예상된다. 이 논문에서는 간략한 유통구조의 모델을 개발하고 경제적 분석을 통해 이러한 경쟁의 특성과 이들이 주는 유통전략에의 의미를 연구하기로 한다. 특히 여기에서는 가격경쟁에 초점을 두고 게임이론을 응용하여, 제조회사와 소매상의 전략적인 가격정책을 다루기로 한다. 제조회사의 전략변수에서는 소매상형태의 결정, 도매가격 결정, 소매상의 담당영역 결정 등이 다루어지고, 소매상의 전략으로는 상품의 다변화, 소매영역의 협상, 경쟁적인 소매가격의 결정 등이 다루어진다.

향끽미종 잎담배의 탈착 엔탈피 변화에 관한 상관성 연구

최승찬 한국연초학회 1984 한국연초학회지 Vol.6 No.1

The net enthalpy changes for the water desorption of sun-cured tobacco have been studied. In order to compare the values of net enthalpy changes for the samples at the same moisture contents, correlation analyses have been performed. The results are summarizing as followings : 1 . As temperature and water vapor pressure increased, equlibrium moisture content were approaching to the saturated vapor pressure of water. 2. The values of 1nP against the reciprocal of absolute temperature were linear for the water desorption of samples. 3. Multiple regression was analyzed to calculate the values of 1nP at the same moisture content. The significance of $x^2$-test for the multiple regression was 0.5%. 4. The values of net enthalpy changes for Basma were greater than those of Sohyang at the same moisture content.

Fabrication and Characterization of Interpenetrating Polymer Network Hydrogels Including Pullulan

최승찬,손정선 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2

Hydrogels contain hydrophilic functional groups that can absorb water and are highly biocompatible because they are similar to structurally hydrated extracellular matrix. However, when the hydrogel swells, the distance between the polymer chains increases and the mechanical strength decreases. Recently, it has been reported that hydrogels synthesized by interpenetrating polymer network(IPN) with polysaccharides have higher mechanical strength than general hydrogels. In this study, the primary network of the hydrogel was copolymerized with 2-hydroxyethyl methacrylate and vinylpyrrolidone in different ratios, and the secondary network was prepared by IPN-hydrogels with various contents of pullulan, a type of polysaccharide. The characteristics of hydrogels such as water content, tensile strength, morphology, and contact angle were investigated. As a result, it was confirmed that the IPN hydrogel containing pullulan can be used as a high-strength hydrogel material.

2-하이드록시에틸 메타크릴레이트와 풀루란 상호침투가교 하이드로겔의 합성 및 특성

최승찬,김준섭,손정선 한국공업화학회 2021 한국공업화학회 연구논문 초록집 Vol.2021 No.0

국내 건축자재에 대한 라돈 방출량 평가 연구

최승찬,김도현,김선홍,김민준,강경민,차동욱,복은정,조승연 한국실내환경학회 2014 한국실내환경학회지 Vol.13 No.4

Radon is an inert gas, and a naturally occurring radioactive material. Radon is produced by radium and uranium. Generated radon causes lung cancer through the inhalation. Therefore, If uranium contaminated soil is close to indoor spaces, residents may be exposed to this radioactive material(Radon). Generally, radon affects the first to third floors of buildings. But our research team has often detected high radon concentration in the indoor air of high-rise apartments. The reason for this is that building materials containing uranium and radium are brought into apartments. This study was conducted an investigation into the radon emission rate of building materials being used in South Korea. Also, our team conducted an investigation into the radon emission rate of gypsum tiles and concrete found in an apartment(17th floor apartment indoor radon concentration 5.03 pCi/L, Rad- 7(DURRIDGECo.USA)). Finally, we investigated the radon emission rate of bricks containing the soil near a uranium mine. The average radon emission rates of general building materials are as followings: (gypsum board : 0.20 · h-1/kg, gravel : 0.05, gypsum tile : 0.02, indoor tile : 0.08, general brick : 0.02, red clay tile : 0.02, concrete : 0.11, uranium mine soil : 4.81). The results regarding the radon emission rate from a 17th floor apartment’s building materials are as followings: (gypsum board : 0.70, concrete : N/A). The results regarding the radon emission rate from bricks containing soil near a uranium mine was 0.19. This experiment indicates that gypsum boards show the highest radon emission rate among general building materials. In particular, the radon emission rate from the gypsum boards in a 17th floor apartment was 3.5 times higher than general gypsum boards. Overall the results suggest that building materials that possess high levels of uranium emit more radon gas than any other materials. South Korea has not established legal regulations on radon emission from building materials. However, the results of this study strongly suggest that it is of the utmost importance to manage the radon emission rate of building materials and control their usage before construction.