• 대한기계학회논문집A
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• 제20권3호
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• pp.933-944
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• 1996

In this paper, two new techniques, the pattern filling and the refined flow field regeneration, based on the finite element method and Eulerian mesh advancement approach have been developed to analyze incompressible viscous flow with free surfaces. The gorerning equation for flow analysis is Navier-Stokes equation including inertia and gravity effects. The penalty and Newton-Raphson methods are used effectively for finite element formulation. The flow front surface and the volume inflow rate are calculated using the pattern filling technique to select an adequate pattern among five filling patterns at each quadrilateral control volume. By the refined flow field regeneration technique, the new flow field which renders better prediction in flow surface shape is generated and the velocity field at the flow front part is calculated more exactly. Using the new thchniques to be developed, the dam-breaking problem has been analyzed to predict flow phenomenon of fluid and the predicted front positions versus time have been compared with the reported experimental result.

• 국제학술발표논문집
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• The 3th International Conference on Construction Engineering and Project Management
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• pp.1608-1614
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• 2009

In recent days, the study of urban regeneration has been conducting with purposeful and sincere intent starting out with the residential environment improvement works. Within the range of urban regeneration, the low-cost housing technology means development of totally-integrated housing technology that may be applied to the regeneration project, especially for the rundown areas where infrastructure facilities in the urban zone have been degraded and obsoleted. In line with this, among many and varied methods in order for realization of the low-cost housing as a part of urban regeneration project, this study should like to propose an improvement methods of the key technologies in relation to the construction works by type of work with which construction costs (directing cost) would be reduced. And, in order to elicit the method for element technology that has been developed and improved in the most optimal manner centering on the selected construction work by the type of work, the researcher conducted comparative review of summary of element technologies related to the construction works concerned, characteristics, and construction method thereof. In particular, the researcher investigated the expenses (construction cost and labor cost), constructions (contractibility and productivity), safety, quality of works, and the technical status in environmental aspects, and the researcher also conducted analyses and evaluations thereof.

• 한국연초학회지
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• 제13권2호
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• pp.34-41
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• 1991

To explore the possibility of introducing Zea mays transposable element Ac(activator) which can be used as a mutagen and gene tag in tobacco plants other than maitre, we tried to introduce a cloned Ac element into tobacco cells by an Agrobacterium tumefaciens binary vector system. Transformation of N. babacum cv. Burley 21 tissues and regeneration to whole plant were carried out. The frequency of the transformed callus induced in shoot induction media was higher than that of transformed callus induced in callus induction media. However, the calli were not grown in the second selection media, and became yellow senescent calli. Regenerated tobacco plantlets with foreign gene were also obtained in shoot induction media containing 100 $\mu\textrm{g}$/ml kanamycin and 100$\mu\textrm{g}$/ml carbenicillin. The leaf tissues of transformant was also resistant to 1000 $\mu\textrm{g}$/ml kanamycin. The chromosomal DNAs of transformant and normal plant of N. tabacum were digested by EcoR I and Hind III but not by Pst I.

• 한국CDE학회논문집
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• 제14권3호
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• pp.197-206
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• 2009

In a finite element analysis of the metal forming processes having large plastic deformation, largely distorted elements are unstable and hence they influence upon the result toward negative way so that adaptive remeshing is required to avoid a failure in the numerical computation. Therefore automatic mesh generation and regeneration is very important to avoid a numerical failure in a finite element analysis. In case of generating quadrilateral mesh, the automation is more difficult than that of triangular mesh because of its geometric complexity. However its demand is very high due to the precision of analysis. Thus, in this study, an automatic quadrilateral mesh generation and regeneration method using grid-based approach is developed. The developed method contains decision of grid size to generate initial mesh inside a two dimensional domain, classification of boundary angles and inner boundary nodes to improve element qualities in case of concave domains, and boundary projection to construct the final mesh.

• Journal of Periodontal and Implant Science
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• 제34권1호
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• pp.35-48
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• 2004

Since the occlusal loading is transmitted to the surrounding bone, the success of an implant treatment is closely related to the distribution of the stress on the implant. The finite element analysis method is often used in order to produce a model for dispersion of stress. Assessment of the success of the implant is usually based on the degree of osseointegration which is a bone and implant surface interface. Implant used in this research was designed through the method of shape optimization after the stress on implant was anaylzed by the finite element analysis method. This study was pertinently assessed by a clinical, histologic, histomorphometric analysis after the shape optimized implant was installed on beagle dog tibia. The results are as follows 1. It clinically showed a good result without mobility and imflammatory reaction. 2. Implant was supported by dense bone and bone remodeling showed on the surrounding area of the implant 3. The average percentage of bone-implant contact was 58.1%.The percentage of bone density was 57.6%. Having above results, shape optimized implant showed the pertinence through clinical and histologic aspects. However, to use the shape optimized implant, the further experiment is required for finding problems, improvement.

• 대한치주과학회:학술대회논문집
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• 대한치주과학회 2007년도 제47회 종합학술대회 연제초록
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• pp.142-143
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• 2007

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제52권6호
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• pp.247-253
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• 2003

A novel finite element mesh regeneration method is presented for 3D shape optimization of electromagnetic devices. The method has its theoretical basis in the structural deformation of an elastic body. When the shape of the electromagnetic devices changes during the optimization process, a proper 3D finite element mesh can be easily obtained using the method from the initial mesh. For real engineering problems, the method guarantees a smooth shape with proper mesh quality, and maintains the same mesh topology as the initial mesh. Application of the optimum design of an electromagnetic shielding plate shows the effectiveness of the presented method.

• 한국습지학회지
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• 제14권4호
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• pp.675-685
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• 2012

본 연구는 이작도 내 산재해있는 폐교, 노후불량주택, 쇠퇴산업시설, 폐공간인 노후쇠퇴시설에 대한 면밀한 조사를 통해 생태문화적 재생 방안을 제시하는데 목적을 두고 있다. 연구방법은 도서지역 생태문화적 재생 요소인 토지이용, 교통체계, 건축물, 자원순환, 보전 및 보존, 관광자원화, 기반시설 부문에서 중요요소를 선정하였고, 이작도의 노후쇠퇴시설에 적용 및 재생 방안을 제시하였다. 연구결과는 첫째, 폐교된 계남분교는 숙박과 교육이 가능한 이작 아일랜드 센터로 조성한다. 둘째, 노후불량주택은 주거환경개선을 위해 주택 내 외부 리모델링할 뿐만 아니라 생태교육관과 도서생활전시관으로 정비해야 한다. 셋째, 쇠퇴산업시설은 대합실 내 비지팅센터 설치와 해양체험의 장소로 조성하도록 한다. 넷째, 폐공간은 간이판매대 설치와 녹색교통체계 구축하고 생태문화 탐방로를 조성해야 한다.

• 한국경제지리학회지
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• 제23권2호
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• pp.182-196
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• 2020

본 연구는 산업유산 재생 사례로서, 하이라인의 특성 및 성과를 분석하고, 이를 통해 진일보한 도시재생의 방향을 설정하기 위한 시사점을 도출하는 것을 목적으로 한다. 본 연구결과를 요약하면 다음과 같다. 첫째로, 산업유산 재생사례로서 하이라인의 특성 및 성과 분석을 위한 틀로 거버넌스, 물리적 성과, 경제적 성과, 사회적 성과, 문화적 성과 이상 5개의 분석요소를 도출하였고, 각 요소별로 총 15개의 지표를 선정하였다. 둘째로, 하이라인의 특성 및 성과 분석결과를 보면, 하이라인 재생사업은 효과적인 거버넌스의 구축과 이를 통한 커뮤니티 활성화, 역사성과 장소성을 고려한 물리적 개선, 낙후된 맨해튼 중서부 지역의 경제 활성화 등의 성과를 보인 반면, 젠트리피케이션에 따른 둥지 내몰림 등의 문제를 안고 있음을 확인할 수 있다.

• 한국농촌건축학회논문집
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• 제23권1호
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• pp.51-58
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• 2021

The purpose of this study is to use urban regeneration management types through classification and step-setting of physical types by administrative dong as the basis data for future urban management plans in local small and medium cities. The analysis was conducted on the physical density of each administrative dong by setting the data on urban and architecture provided by the government as three elements: buildings, lots, roads, etc. Through the system classified in this study, Mokpo City's 23 administrative districts were divided into nine management types and three management steps. Methodology can be utilized to establish areas of similar areas within the city and to use them as basic data for planning management. It is meaningful that it is possible to extract areas that need actual regeneration and maintenance through physical density analysis and plan suitable projects.