토지피복분류 기법을 이용한 고해상도 위성영상의 분류 정확도 비교 분석

강남이(Kang, Nam Yi),이경민(Lee, Kyung Min),조기성(Cho, Gi Sung) 대한토목학회 2012 대한토목학회 학술대회 Vol.2012 No.10

구강보호장치의 재료적인 특성이 하악골 충격 시악골 및 두부에 미치는 영향에 관한 유한요소분석

강남현,김형섭,우이형,최대균,Kang, Nam-Hyun,Kim, Hyung-Sub,Woo, Yi-Hyung,Choi, Dae-Gyun 대한치과보철학회 2008 대한치과보철학회지 Vol.46 No.4

연구목적: 본 연구의 목적은 하악골 충격 시 구강보호장치의 재료적 성질에 따른 악골과 두부에 미치는 영향을 조사하는 것이다. 연구재료 및 방법: 경질과 연질의 서로 다른 성질을 가지는 구강보호장치를 두부외상이나 뇌질환 병력이 없고 정상교합과 자연치열을 가진 한국 성인 여성에게 제작하고, CT를 이용하여 악골과 두부의 3차원 유한요소모델을 제작하였다. 이 유한요소모델은 두개골, 뇌, 상악골, 하악골, 관절원판, 치아와 구강보호장치를 포함하며 407,825개의 elements와 82,138개의 node로 구성되어 있다. 0.1초동안 하악골 3부위에서 800 N으로 사선 방향의 힘을 가하였을 때 두 가지 재료에 따른 상악 치아, 상악골 및 두개골의 응력분포를 평가하였고 동일한 조건하에서 두 재료에 따른 뇌의 변위량을 비교하였다. 결과: 이 연구를 통해 다음과 같은 결과를 얻었다. 1. 상악치아에서 유효응력 값을 비교하였을 때 연질의 구강보호장치가 경질의 구강보호 장치보다 응력값이 유의차 있게 작게 나타났다 (P < .05). 2. 상악골과 두개골에서 응력값을 비교하였을 때 연질의 구강보호장치가 경질의 구강보호장치보다 응력값이 유의차 있게 작게 나타났다 (P < .05). 3. 경질의 구강보호장치에서 연질의 구강보호장치보다 상악치아 및 상악골과 두개골에 더 많은 응력집중부위를 보였다. 4. 경질의 구강보호장치와 연질의 구강보호장치 간에 하악 충격 시 뇌의 변위량은 연질의 구강보호장치 쪽이 크게 나타났으나 유의차는 없었다. 본 연구를 통하여 악골 충격 시에 경질 및 연질 구강보호장치가 상악골과 두개골에서의 응력분포에 미치는 양상을 알 수 있었지만, 아직도 이의 상관관계를 모두 파악하기에는 불충분한 점이 많으리라 생각되며, 스포츠 외상에 따른 구강보호장치의 재료에 따른 상관관계에 대하여 보다 더 많은 연구가 필요할 것으로 사료된다. Statement of problem & Purpose: The purpose of this study was to investigate the effect of a mouth guard material properties on the skull and brain when they were under impact loads on mandible. Material and methods: Two customized mouth protectors having different material propeerst ieach other were made for a female Korean who had no history of brain trauma, no cerebral diseases, nomal occlusion and natural dentition. The 3D finite element model of human skull and brain scanned by means of computed tomography was constructed. The FEM model of head was composed of 407,825 elements and 82,138 nodes, including skull, brain, maxilla, mandible, articular disc, teeth and mouth guard. The stress concentrations on maxillary teeth, maxilla and skull with two mouth guards were evaluated under oblique impact load of 800N onto mandibular 3 loading points for 0.1sec. And the brain relative displacement was compared in two different mouth guard materials under same condition. Result and Conclusion: The results were as follows; 1. In comparison of von Mises stress on maxillary teeth, a soft mouth guard material had significantly lower stress values on measuring point than a hard mouth protector materials (P < .05). 2. In comparison of von Mises stress on maxilla and skull, A soft mouth protector material had significantly lower stress values on measuring point than a hard mouth protector materials (P < .05). 3. For impact loads on mandible, there were more stress concentrated area on maxilla and skull with hard mouth guard than soft with mouth protector. 4. For impact loads on mandible, brain relative displacement had little relation with mouth guard material properties. In results of this study, soft mouth guard materials were superior to hard mouth guard materials for mandible impact loads for prevention of sports injuries. Although the results of this study were not enough to figure out the roles of needed mouth guard material properties for a human head, we got some knowledge of the pattern about stress concentration and distribution on maxilla and skull for impact loads with soft or hard mouth protector. More studies are needed to substantiate the relationship between the mouth guard materials and sports injuries.

연구논문 : 경로당 노인의 식습관 및 영양지식과 신체건강기능수준에 관한 연구

강남이 ( Nam E Kang ),추수경 ( Su Kyung Chu ),유장학 ( Jang Hak Yoo ),이승훈 ( Seung Hoon Yi ) 한국식생활문화학회 2009 韓國食生活文化學會誌 Vol.24 No.6

The purpose of this study was to determine the basic materials needed for nutrition and health programs for aged people. In order to set up these programs, the nutritional habit, nutritional knowledge and functional health status (mobility, functional assessment, and falls efficacy) of the aged were measured, and their relationships were determined. Data was collected on 57 aged individuals that participated in the `Exercise Program for the Aged` conducted by the National Health Insurance Corporation. These 57 subjects were interviewed and tested by direct measurement prior to conducting the program. The data was analyzed using the SPSS 13.0 Package. According to the results, the nutritional habit ranged from 24-50 out of 50, and the average was 37.2, which was above the middle level. The average nutritional knowledge was of 4.02 out of 5, which was considered reasonably high. Especially, more than half of these subjects were uneducated, but they had a high interest in nutrition. The average mobility was determined to be 9.2 seconds and the falls efficacy was 64.2 out of 100. In addition, subjects answered that they had a fear of falling due to low confidence, which indicates that safety education for the prevention of falls should be provided to aged individuals in the future. The results showed that notable counter-relations between nutritional habit and functional health status existed.

IKONOS 영상을 이용한 토지피복분류 기법 분석

강남이(Kang, Nam Yi),박정기(Pak, Jung Gi),조기성(Cho, Gi Sung),유연(Yeu, Yeon) 대한공간정보학회 2012 대한공간정보학회지 Vol.20 No.3

최근 고해상도 위성영상은 자연자원이나 환경 관리에 필요로 하는 토지 피복 및 이용 현황자료 등에 유용하게 사용되고 있는 실정이다. 이에 따라 고액의 투자가 필요로 하는 위성영상의 효율성을 높이기 위하여 영상자료의 분석과정이 중요해지고 있다. 따라서 본 연구에서는 전처리 과정 중 연구대상에 대한 통계값에 대한 계산 및 분석을 수행하였으며, 전통적인 분류 기법인 최대우도 분류 외에도 인공신경망 분류와 SVM 분류에 대하여 설명하고 고해상도 위성영상인 IKONOS영상에 각 분류기법을 적용하여 토지피복분류를 하였으며, 각각의 결과를 오차 행렬을 통해 정확도 분석을 수행하였다. 그 결과 다른 분류 기법에 비해 Support Vector Machines(SVM) 분류 기법이 전체 정확도가 약 86%정도로 가장 우위의 결과물을 도출하였다. Recently the high-resolution satellite images are helpfully using the land cover, status data for the natural resources or environment management. The effective satellite analysis process for these satellite images that require high investment can be increase the effectiveness has become increasingly important. In this Study, the statistical value of the training data is calculated and analyzed during the preprocessing. Also, that is explained about the maximum likelihood classification of traditional classification method, artificial neural network (ANN) classification method and Support Vector Machines(SVM) classification method and then the IKONOS high-resolution satellite imagery was produced the land cover map using each classification method. Each result data had to analyze the accuracy through the error matrix. The results of this study prove that SVM classification method can be good alternative of the total accuracy of about 86% than other classification method.

간호사의 수분 섭취배설량 측정에 대한 인식도와 수행도

강남이(Kang, Nam-Yi),안숙희(Ahn, Sukhee) 대한근관절건강학회 2016 근관절건강학회지 Vol.23 No.2

Purpose: This research aimed to identify levels of nurses’ perception and practice of fluid intake and output (I & O) measurement and to explore the relationship between perception and practice of it. Methods: Using a cross-sectional survey design, 195 nurses who practiced fluid I & O measurement were recruited from a general hospital. Nurses who agreed to participate in this study completed a structured study questionnaire to assess their levels of perception and practice of fluid I & O measurement. Results: A level of perception of I & O measurement was high (3.46 points out of 5), and scores for 3 subdomains of I & O (importance, accuracy, and efficacy) were evenly high. The level of practice of I & O was fairly high (3.76 points out of 5). Perception and practice of I & O were highly correlated (r=.73, p<.001). Conclusion: Nurses seem to have higher levels of perception and do practice fluid I & O measurement correctly. In order to have reliable and valid I & O measures, nurses need to have continuous education on I & O measurement based on clinical guideline to utilize it as an invaluable clinical instrument.

KOMPSAT-2 영상의 토지피복분류에 적합한 SVM 커널 함수 비교 연구

강남이(Kang, Nam Yi),고신영(Go, Sin Young),조기성(Cho, Gi Sung) 대한공간정보학회 2013 대한공간정보학회지 Vol.21 No.2

최근 고해상도 위성영상은 자연자원이나 환경 관리에 필요로 하는 토지 피복 및 이용 현황자료 분석 등에 유용하게 사용되고 있다. 영상처리 알고리즘 중 SVM 알고리즘은 최근 다양한 분야에서 이용되고 있다. 그러나 SVM 알고리즘은 다양한 커널 함수 및 매개변수에 의해 그 정확도가 달라진다. 따라서 본 논문에서는 SVM 알고리즘의 대표적 커널 함수를 KOMPSAT-2의 영상자료에 적용하고 토지피복결과를 검사점을 이용하여 정확도 분석을 실시하였다. 또한 대상지의 토지피복분류에 적합한 SVM의 커널 함수 선정하기 위해 분석을 실시하였다. 그 결과 전체 분류 정확도에는 Polynomial 커널 함수가 가장 높은 정확도를 보였으며 분류 항목별 정확도에서의 가장 적절한 커널 함수는 Polynomial, RBF 커널 함수임을 알 수 있었다. Recently, the high-resolution satellite images is used the land cover and status data for the natural resources or environment management very helpful. The SVM algorithm of image processing has been used in various field. However, classification accuracy by SVM algorithm can be changed by various kernel functions and parameters. In this paper, the typical kernel function of the SVM algorithm was applied to the KOMPSAT-2 image and than the result of land cover performed the accuracy analysis using the checkpoint. Also, we carried out the analysis for selected the SVM kernel function from the land cover of the target region. As a result, the polynomial kernel function is demonstrated about the highest overall accuracy of classification. And that we know that the polynomial kernel and RBF kernel function is the best kernel function about each classification category accuracy.

석회복합체와 흙을 이용한 흙벽체 재료 개발에 관한 기초적 연구

황혜주(Hwang, Hey zoo),강남이(Kang, Nam Yi) 한국생태환경건축학회 2010 한국생태환경건축학회 논문집 Vol.10 No.5

친환경 무시멘트 황토결합재의 적용가능성에 관한 연구

황혜주(Hwang, Hey Zoo),강남이(Kang, Nam Yi) 한국생태환경건축학회 2008 한국생태환경건축학회 논문집 Vol.8 No.1

전통마감기법을 활용한 친환경 발수제 개발에 관한 연구

황혜주(Hwang Hey-Zoo),강남이(Kang Nam-Yi),서은희(Seo Eun-Hee) 대한건축학회 2008 大韓建築學會論文集 : 構造系 Vol.24 No.6

By the analysis on the principle and effect of 'Kongdam,' (waxing the floor base sheets with ground beans) one of the traditional finishing methods, this study, which had intended to provide the fundamentals for the development of an environment-friendly water-repellent utilizing the traditional techniques in contrast with the other water-repellent used at present, received the following results. 1) In the experiment for the ratio of beans and water, it was difficult to apply 1:1 proportion due to the insufficient amount of water. It was possible to apply the 1:2 proportion on the base sheet of the earth finish, but there were some sticking to the surface. There was no sticking from the 1:3 proportion, and hardness increased. 2) Perilla Oil : For hardness in the experiment for the ratio of water, the values of surface hardness resulted up to 8H in all the proportions. For water permeation, the 40:60 proportion showed no penetration. 3) In the comparative experiment for hardness, water-repellent resulted lower than the original hwangto finish with the hardness value between 2B and 3B. The surface hardness of boiled linseed oil or bean oil resulted 3H or 4H, and the Kongdam resulted the highest(8H). 4) In the comparative experiment for water permeation, water-repellent allowed complete water penetration, similar to the case of the original hwangto. The boiled linseed oil and bean oil allowed penetration from 0.7㎝ to 2.4㎝. For the case of Kongdam, it allowed penetration of 0.2~0.3㎝, which showed the best result. 5) It appears that the result is based on the lithification of protein in the bean water and the dryness of the perilla oil. And the water repelling capacity was more effective when only oil was applied on the earth finish. It seems the traditional technique of Kongdam has combined both principles properly. 6) There is a significance for Kongdam as a way to keep the tradition because it has been a Korean traditional technique to repel water, but also in a sense that it uses no chemical substance harmful for men, it is important to study the technique more in depth. To develop it further, many more experiments in terms of its performance as water-repellent should be carried out, and more studies on the traditional finishing techniques should be undertaken in the future.

흙벽 마감을 위한 천연 마감재 성능 비교 연구

황혜주(Hwang, Hey zoo),강남이(Kang, Nam Yi),김태훈(Kim, Tae Hoon) 한국생태환경건축학회 2012 한국생태환경건축학회 논문집 Vol.12 No.5