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복합플랜트 고집적 배치를 위한 지하대공간 지지하중 해석
김세원,박준경,이상준,김영석,Kim, Sewon,Park, Jun Kyung,Lee, Sangjun,Kim, YoungSeok 한국터널지하공간학회 2021 한국터널지하공간학회논문집 Vol.23 No.2
고도의 기술 및 시설이 집약된 복합플랜트 설치 지하대공간 건설을 위해서는 지반 조건 및 다양한 하중 조건에 따른 안정성 검토가 필요하다. 본 논문에서는 유한요소해석을 활용하여 복합플랜트의 고집적 배치를 위한 지하대공간 설계에 활용할 수 있는 해석조건(설계조건)을 검토하였다. 지하대공간 상부하중 및 수평토압을 고려한 지하연속벽체 해석, 복합플랜트 하중 조건에 따른 기초 지반의 변위 및 응력변화 검토, 복합플랜트 지하 설치 시 공사기간 단축 및 공간 레이아웃 활용성을 높이며 플랜트 구조물의 안정성을 확보하기 위한 파이프랙 모듈 구조해석을 수행하였다. 다양한 해석결과를 바탕으로 상세설계 및 시공단계에서 고려해야 할 요소들을 검토하였다. 해석 결과를 통해 지하공간 연속벽체 원형배치가 사각배치 경우보다 수평 변위가 적게 나타남을 확인하였고, 복합플랜트 외부 프레임 하중지지 구조해석 결과 설계 안정성에 관한 시사점을 도출하였다. For the construction of a large underground space with a complex plant installed, it is necessary to analyze the stability considering the ground conditions and various load conditions. In this paper, finite element analysis was performed to analyze the support load that can be used in the design of a large underground space for high-density arrangement of complex plant. An analysis of underground continuous wall (D-wall) was performed considering the load and horizontal earth pressure in the large underground space. In addition, foundation ground analysis was carried out according to the load condition of the complex plant. In order to shorten the construction period, increase the space layout utilization, and secure the stability of the plant structure when installing the complex plant underground, the pipe rack module structure analysis was conducted. This study proposes a design and construction method for the optimal arrangement of underground complex plants using the analysis results.
Scattering 환경에서 FMCW MIMO 레이다를 이용한 EKF 기반 SLAM 구현
김세원(Sewon Kim),서지호(Jiho Seo),Huynh Thinh,박재현(Jaehyun Park) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.2
본 논문은 FMCW(Frequency-Modulated Continuous Wave) MIMO(Multiple-Input and Mulitple-Output) 레이다(Radar)를 이용한 EKF(Extended Kalman Filter)기반 SLAM(Simultaneous Localization and Mapping) 알고리즘을 제안한다. 기존 라이다(Lidar)를 이용한 센싱 정보에 기반한 SLAM에 비교해 레이다를 이용할 경우 센싱 정보에 많은 산란점들이 생길 수 있다. 이러한 부정확한 랜드마크 선정으로 인해 SLAM 알고리즘의 성능이 저하된다. 이를 극복하기 위해 본 논문에서는 랜드마크로부터 반사 및 산란된 레이다 수신신호로 랜드마크 선처리 기법을 제안하였으며, 이를 레이다 기반 SLAM에 접목하였다. 모의 실험을 통해 산란환경에서 기존의 레이다 기반 SLAM에 비해 안정적인 추적 성능을 확인하였으며, 이를 통해 레이다 기반의 자율주행을 구현 가능성을 확인하였다.
북극권 공간정보(GIS) 플랫폼 개발을 위한 환경영향 평가 분석
김세원(Sewon Kim),김영석(YoungSeok Kim) 대한설비공학회 2020 대한설비공학회 학술발표대회논문집 Vol.2020 No.6
Construction in the extreme cold regions becomes one of the important businesses in the world. Geophysical surveys, which are effective in providing consecutive ground information, have been widely applied to the civil engineering and environmental sectors. The permafrost area covers about 14 percent of the world’s land area and the global construction market for such area is rapidly expanding. Where developed countries have already recognized the need for research of the coldest places and therefore have invested heavily in technology development, the non-arctic countries are still developing and related research has rarely been performed. The purpose of this study is to design the GIS(Geophysics Information System) platform for a construction environment with a 2,000 km-class pipeline (overland) operated under the permafrost temperature conditions (-40℃∼+20℃). The GIS platform when subjected to geotechnical engineering provides an understanding of the frozen ground and information about the geo-environment of the extreme cold regions. This paper shows the characteristics and procedures of Environmental Impact Assessment (EIA) for developing Arctic resources, and reviews how to construct a system for the systematic management of the necessary information to consider building the GIS platform. In addition, this study introduces the GIS algorithm to build the route for the pipeline path, and factors which should be considered first are safety, environment, economic feasibility and technical feasibility.
김세원(Sewon Kim),김영숙(Young Sook Kim),김권천(Kweoncheon Kim) 대한외과학회 2008 Annals of Surgical Treatment and Research(ASRT) Vol.75 No.6
Purpose: Percutaneous vacuum-assisted breast biopsy (Mammotome, Fa. Ethicon Endo-Surgery Breast Care) is now commonly performed as the initial approach to diagnose and treat benign breast lesions. It can obviate the need for surgery in women with benign lesions and often lead to a one-stage surgical procedure when malignant lesions are diagnosed. The purpose of this study was to report the outcome of the Mammotome biopsy.. Methods: We performed 902 cases of Mammotome biopsy (total 474 patients) to confirm the diagnosis and to excise the lesion between January 2003 and December 2006. Among all these cases, 888 cases with radiographically suspected benign lesions, below BI-RADS category 4, were followed up for more than 6 months and we analyzed clinical and pathologic results of these cases, retrospectively. Ultrasonographic follow-up examinations were performed and no malignant tumor or atypical ductal hyperplasia was included. Results: The mean patient age was 42 (range: 17∼76) years. The average size of lesion was 1.12 (range: 0.20∼5.0) cm. In BI-RADS category, there were 450 (49.8%) C2 lesions, 158 (17.8%) C3 lesions and 251 (27.8%) C4 lesions. Histology revealed 506 cases (56.0%) of fibrocystic disease, 295 (32.7%) fibroadenomas, 11 (1.1%) intraductal papillomas, 16 cases (1.7%) of sclerosing adenosis, 21 cases (2.5%) of ductal epithelial hyperplasia, 18 cases (2.1%) of fat necrosis, 3 cases (0.3%) of gynecomastia, 18 cases (1.9%) of chronic inflammation. 824 lesions (92.8%) were completely removed, 39 cases (4.4%) of residual lesion and 25 cases (2.8%) of postoperative scar were reported. Conclusion: Mammotome biopsy is an effective diagnostic and therapeutic management of benign breast lesions with minimal-invasiveness and minimizes postoperative complications.