• 대한의용생체공학회:의공학회지
• /
• 제27권3호
• /
• pp.110-116
• /
• 2006

Finite element method (FEM) provides several advantages over other numerical methods such as boundary element method, since it allows truly volumetric analysis and incorporation of realistic electrical conductivity values. Finite element mesh generation is the first requirement in such in FEM to represent the volumetric domain of interest with numerous finite elements accurately. However, conventional mesh generators and approaches offered by commercial packages do not generate meshes that are content-adaptive to the contents of given images. In this paper, we present software that has been implemented to generate content-adaptive finite element meshes (cMESHes) based on the contents of MR images. The software offers various computational tools for cMESH generation from multi-slice MR images. The software named as the Content-adaptive FE Mesh Generation Toolbox runs under the commercially available technical computation software called Matlab. The major routines in the toolbox include anisotropic filtering of MR images, feature map generation, content-adaptive node generation, Delaunay tessellation, and MRI segmentation for the head conductivity modeling. The presented tools should be useful to researchers who wish to generate efficient mesh models from a set of MR images. The toolbox is available upon request made to the Functional and Metabolic Imaging Center or Bio-imaging Laboratory at Kyung Hee University in Korea.

• KIEAE Journal
• /
• 제4권3호
• /
• pp.45-52
• /
• 2004

The purpose of this research was to identify the structural characteristics of open housing typologically and systematically. The main method of this study was content analysis and literature review on open housing. This study found that the typological analysis on terminology and the details of the constituents concerning structural patterns in open housing indicated that the main approaches were classified into three criteria such as 'Organization Element', 'Construction Element', and 'Equipment Element'. Organization Element was classified into 'Main Dwelling Unit Area and its Form', 'Room Organization Method', 'Relationship with the Main Dwelling Unit's External Constituents', and 'Combination Method of Support and Infill'. Construction Element was classified into 'Method of Structure' and 'Structural Element Technology'. Equipment Element was classified into 'Method of Using Duct' and 'Wet Zone Method'. The attributes were determined based on these classifications. The results of this study can be used to construct an evaluation tool and further to develop a framework in understanding open housing. Technical research should be conducted on the variables that affect the flexibility of space.

• 상하수도학회지
• /
• 제29권1호
• /
• pp.107-122
• /
• 2015

The purpose of this study is to analyze the structural stability of pavement due to water infiltration at the road with infiltration trench as using the FEM(finite element analysis). Five cases for FEM is divided considering the amount of rainfall and rain duration time. The results of FEM show that the more rainfall in a short period time is faster the change of moisture content. Also, it is the proportional relationship between and changing area of moisture content of more than 40% due to rainfall. Case 3 and 4 are necessary to check the installation of infiltration trench because of moisture content of more than 40%, recovery time of initial moisture content, and changing area of more than 40%. Case 1,2, and 5 have no a significant effect on road pavement structure due to lower moisture content and shorter duration time of higher moisture content.

• 한국환경보건학회지
• /
• 제17권1호
• /
• pp.129-135
• /
• 1991

To investigate on the trace element content of twelve edible mushrooms and Aloe arborescens, i. e., Lentinus edodes, Ganoderma lucidum (culturing in wood and soil), Tricholoma matsutake, Agaricus bisporus, Cyrophora esculenta, Auricularia auricula-Jude (produced in Korea and China), Sarcodon asparatus, Pleurotus ostreatus, Coriolus versicolor, Smilax rotundifolia and Aloe arborescerts were analyzed by Atomic absorption spectrometer. The obtained results were summerized as follows: 1. Potassium, sodium, magnesium and iron content for the most part samples were in large quantities, especially phosphorus content of those was highest ammount for the all samples. 2. Sodium content was much ammount in the Lentinus edodes (39mg) and Ganoderma lucidurn (20 mg), Culturing in wood and soil, while potassium was very high ammount in the Aloe arborescens and other samples. Mush ammount of magnesium as compared with others was Lentinus edodes (144mg), Ganoderma lucidurn (128mg), Aloe arborescerts (50mg) and pleurotus ostreatus (60mg). Phosphorus content of Ganoderma lucidurn, Lentinus edodes, Gyrophora esculenta, Auricularia polytricha and Agaricus bisporus was much ammount while iron content of all samples equality higher ammount. Sodium content of Aloe arborescens was not analyzed out for almost all, its potassium (82mg), magnesium (50mg) and iron (18rng) content comparatively higher quentity than others minerals and phosphorus volume (4.9mg) as compared with others, was conspicuously lower detect. 4. Cadimium and lead content of harmful metal element were detected on trace quentity for the most part samples 5. Organic acids of samples i.e., Legtinus edodes, Agaricus bisporus, Pleurotus ostreatus and Ganoderma lucidum were Citrate, Malate, Fumalate, Succinate, Oxalate, Acetate, Lactate, and Tartarate and Citrate, Malate and Fumarate contents were higher amount remarkbly than other organic acids. Tartarate content was trace amount.

• 생명과학회지
• /
• 제9권5호
• /
• pp.620-627
• /
• 1999

This study was conducted to elucidate the growth characteristics and change of inorganic element in the leaf of perilla by replanting. The replanting injury in the height of perilla appeared from the 2nd and 3rd year after replanting, and the sickness of soil occurred from the 4th year. Number of node of perilla by replanting was significantly affected to the middle stage of growth, but was similar at the latter stage of growth. Weight of a leaf was the highest at the 1st and 2nd year, and decreased with the replanting. Also, the rate of dry leaf decreased with the replanting. In the content of inorganic element of the perilla leaf by replanting, N in the leaf increased with the replanting, and K and S decreased. However the content of Ca, Cu and Mn did not affected to replanting.

• 미생물학회지
• /
• 제13권1호
• /
• pp.31-36
• /
• 1975

Chlorella ellipsoidea cells were cultured in a phosphate, magnesium, sulfur or potassium-free medium. Some portions of cells were taken out at intervals during the culture, and physiological activities such as growth rate, reproduction, photosynthetic activity, and biosynthesis of cholorophyll of macro-element deficient cells were measured. 1) Generally, growth rate, reproduction, photosynthetic activities, and biosynthesis of chlorophyll of the macro-element deficient cells decreased more or less, compared with those of the normal cells. 2) The growth and reproduction of the algal cells in sulfur, or magnesium free medium were retarted severely with the chlorosis ; the photosynthetic activity and the content of chlorophyll showed the same tendency. 3) It is considered that the decrease in growth rate of macro-element deficient Chlorella cells is due to the decrease in photosynthetic activity owing to the decrease in chlorophyll content of the cells.

• 한국콘텐츠학회논문지
• /
• 제11권8호
• /
• pp.204-210
• /
• 2011

방사선에너지가 생체에 미치는 영향 중 물질대사에 관여하는 미량원소의 함량을 알아보았다. 실험 방법은 mouse에 1Gy, 5Gy, 10Gy의 X선을 전신 조사한 후 간 조직에서 분석하였다. 그 결과, 일부 원소에서 대조군과 비교하여 함량 변화가 확인되었다. 선량에 따른 변화에서는 1Gy에서는 크게 차이를 보이지 않았으나 5Gy, 10Gy의 높은 선량에서는 Ca, Mn의 함량이 감소되었다. 그 중 Ca의 함량이 가장 많이 감소되었으며, 근육 긴장과 만성 두통 등의 증후군을 유발하는 것으로 판단된다. 함량 증가를 보인 원소는 Al으로 100% 증가된 것으로 조사되었다. 방사선 조사 후 기간 경과에 따른 함량 변화에서는 Fe, Ba 등에서 감소하는 경향을 보였다. 유해원소는 Cd 함량이 25% 증가 되었는데 이는 칼슘대사에 관여하는 것으로 알려졌다. 따라서 방사선에너지에 의한 세포 손상이 미량원소 함량 변화에 영향을 주는 것으로 판단되며, 전구증상을 유발하는데 일정부분 관련이 있는 것으로 사료된다.

• 한국콘텐츠학회논문지
• /
• 제7권8호
• /
• pp.76-85
• /
• 2007

게임시장에서는 유선 온라인 게임의 수익을 극대화 할 수 있는 방안의 하나로 유선 온라인 게임의 소재를 연동 요소로 채택한 모바일 콘텐츠가 서비스 중에 있다. 본 논문에서는 유무선 연동 게임 콘텐츠의 연동방법을 크게 자체전송형, 인증코드형, 혼합형의 3가지로 분류하고 다수의 유선 온라인 게임에서 선택한 연동 요소들과 연동유형의 연관성에 대해 분석해 보고 특정 온라인게임에 적합한 유무선 연동 콘텐츠를 개발하여 연동서버, 모바일의 입출력 및 처리를 담당하는 모바일 서버 그리고 사용자들이 게임 내에서의 모든 정보를 기록하는 게임서버를 실제로 구현하고 연동해 봄으로써 유무선 연동 게임 콘텐츠의 구현 방법을 제안하고자 한다.

• 대한의용생체공학회:의공학회지
• /
• 제28권1호
• /
• pp.8-16
• /
• 2007

Finite element analysis (FEA) is an effective means for the analysis of bioelectromagnetism. It has been successfully applied to various problems over conventional methods such as boundary element analysis and finite difference analysis. However, its utilization has been limited due to the overwhelming computational load despite of its analytical power. We have previously developed a novel mesh generation scheme that produces FE meshes that are content-adaptive to given MR images. MRI content-adaptive FE meshes (cMeshes) represent the electrically conducting domain more effectively with far less number of nodes and elements, thus lessen the computational load. In general, the cMesh generation is affected by the quality of feature maps derived from MRI. In this study, we have tested various feature maps created based on the improved differential geometry measures for more effective cMesh head models. As performance indices, correlation coefficient (CC), root mean squared error (RMSE), relative error (RE), and the quality of cMesh triangle elements are used. The results show that there is a significant variation according to the characteristics of specific feature maps on cMesh generation, and offer additional choices of feature maps to yield more effective and efficient generation of cMeshes. We believe that cMeshes with specific and improved feature map generation schemes should be useful in the FEA of bioelectromagnetic problems.

• 디지털융복합연구
• /
• 제13권4호
• /
• pp.377-385
• /
• 2015

본 연구의 목적은 2014 코리아컵 국제체조대회 링 종목 결승전에 참여한 국내외 우수선수를 대상으로 난도 점수, 실행 점수 및 실시기술에 대한 난도요소 분포, 그룹요소별 기술 분포 등에 대한 연기내용을 분석한 융복합연구로서 경기력 향상을 위한 훈련방향 설정과 연기구성 및 기술 습득 전략 수립에 기여하고자 수행하였다. 자료 수집은 경기 성적표와 심판들에게 배포되는 경기결과 자료 및 경기영상을 촬영한 것을 이용하였다. 연기내용 분석 결과에 대한 결론은 다음과 같다. 첫째, 우리나라 선수들의 경기기술은 난도가 높은 힘 버티기 보다는 스윙기에 의존하는 특성을 보였다. 둘째, 스윙기 기술에 익숙한 특성을 살려서 난도가 높은 Jonasson과 Roll bwd. slowly with str. arms and body to swallow(2s.) 기술 습득이 필요하다. 셋째, 버티기 기술과 고난도 기술 습득을 위한 기술 감각훈련 및 근력 강화 프로그램이 개발되어야 한다.