완전 데이터 적응형 MLS 근사 알고리즘을 이용한 Interleaved MRI의 움직임 보정 알고리즘

남혜원 대한의용생체공학회 2020 의공학회지 Vol.41 No.1

In this paper, we introduce motion artifact reduction algorithm for interleaved MRI using an advanced 3D approximation algorithm. The motion artifact framework of this paper is data corrected by post-processing with a new 3-D approximation algorithm which uses data structure for each voxel. In this study, we simulate and evaluate our algorithm using Shepp-Logan phantom and T1-MRI template for both scattered dataset and uniform dataset. We generated motion artifact using random generated motion parameters for the interleaved MRI. In simulation, we use image coregistration by SPM12 (https://www.fil.ion.ucl.ac.uk/spm/) to estimate the motion parameters. The motion artifact correction is done with using full dataset with estimated motion parameters, as well as use only one half of the full data which is the case when the half volume is corrupted by severe movement. We evaluate using numerical metrics and visualize error images.

고학력 남자 직장인의 비만도의 영양지식조사

남혜원,변진원,우인애,백명숙 한국식품영양학회 1999 韓國食品營養學會誌 Vol.12 No.3

중앙공무원 연수원에서 연수중인 남자 공무원 213명을 대상을 비만과 관련된 인자들을 분석하였다. 조사 대상자는 20대가 52.6%로 가장 많았고, 대부분(96%)이 대졸 출신 이상의 높은 학력 수준을 지니고 있었다. 건강과 관련된 요인들 중 운동 실태가 우수한 것으로 나타났고 흡연율도 상당히 낮았으나, 74.2%의 높은 음주율을 보였다. 한편 22.1%가 질병을 보유하고 있다고 응답하였는데, 그 중 위장질환(22명)이 가장 많았다. 조사 대상자들의 평균신장과 체중은 172.1㎝, 70.5㎏이며, BMI는 23.8, 체지방량 16.1㎏, 체지방율 21.3%, 제지방량 55.4㎏, 체수분함량 40.9㎏으로 나타났다. 비만도는 BMI 기준으로 정상(20∼25)이 64.6%로 가장 많았고, 과체중(25∼27)이 18.4%, 저체중(<20) 9.9%와 비만(>27) 7.1%의 분포를 보였으며, 체지방율은 정상(14∼23%)이 58.7%이었고, 비만(>23%) 34.7%, 저체중(<14%) 6.6%의 순으로 나타났다. BMI와 체지방율은 연령과 정의 상관관계(p<0.01)를, 결혼과는 부의 상관관계(p<0.01)를 나타냈으나 학력이나 수입 정도는 별 영향을 미치지 못하였다. 영양에 대한 지식정도에는 비만도에 따라 큰 차이가 없었으나, 비만과 관련된 식품에 대해 매우 민감한 반응을 보였다. 본 조사대상자들이 고학력임에도 불구하고 영양지식 점수가 양호하지 못하다는 점은 학교나 직장에서의 정규적인 영양교육의 필요성을 제시해준다. This study was carried out to examine obesity and nutrition knowledge in male employees who had high educational background. The subjects in this study were 213 persons, aged 20 to 50(52.6% among them were 20s). Ninety six percent of them graduated university. Most of them took exercise regularly and showed less smoking tends, but drank frequently. Twenty two point one percent of the subjects had diseases, specially gastrointestinal disease. Anthropometric results were height : 172.1㎝ ; weight : 70.5㎏ ; BMI : 23.8 ; fat mass : 16.1㎏ ; fat percentage : 21.3% ; LBM : 55.4㎏ ; and TBW : 40.9㎏. BMI and fat percent were used for screening obesity. According to BMI, the normal group(20∼25) was 64.6%, the overweight group(25∼27) was 18.4%, the underweight group(<20) was 9.9% and the obese group(>27) was 7.1%. Based on fat percentage, the normal group(14%∼23%) was 58.5%, the obese group(>23%) was 36.0% and the underweight group(<14%) was 6.5%. There was significant relationship between age or marriage and BMI or fat percentage. But the rest of socio-demographic and health-related factors didn't affect significantly. There was no difference in nutrition knowledge of subjects by obesity rate, however, obese group was more sensitive to the foods related to weight gain.

경로식당 이용 노인의 급식 만족도 조사

남혜원,이영미,명춘옥,이기완,박영심 대한지역사회영양학회 2000 대한지역사회영양학회지 Vol.5 No.1

This study was designed to determine the attitude and degree of satisfaction of recipients toward the meal service program for elderly people. Nine hundred and eight elderly people(male: 301, female: 607) were interviewed by trained personnel. The results were as follows. Forty two percent of them had no income and 43.8% of the respondents were supported economically by the government. Their main reasons for attending the free congregated meal program was economic hardship(37.9%) The channels of becoming aware of the free meal program were through their friends(33.4%) and the meal service centers were located in the respondents residence area(36.0%) Thus any other advertisement from local government of official channels about the free meal program were not effective for the elderly 26.9% of the respondents felt inconvenience in visiting the meal service centers because they had some difficulty in walking, 53.5% of them however answered that they didn t have any complains and were quite satisfied with the meal service. The average satisfaction score for the free meal service was 63.4(maximum score 75) As for each evaluation item respondents were highly satisfied with volunteers attitude in meal serving(4.58$\pm$0.65: maximum 5 point) The evaluation score of females was generally lower than that of males(p<0.05) Oncemore, respondents who were in lowere socio-economic classes were marked by having significantly lower satisfaction scores for the meal service compared with higher scocio-economic classes. For the welfare of elderly people, meal service programs should be extended to more elderly persons and developed considering the elderlys ecological factors.

영동지역 일부 주민의 음주 , 흡연 , 운동 , 폐경 및 비만 여부에 따른신체계측치와 혈중 지질 농도 및 영양소 섭취 상태 비교

남혜원,김은경,조운형 대한지역사회영양학회 2003 대한지역사회영양학회지 Vol.8 No.5

The purpose of this study was to compare the anthropometry, the serum lipid levels and the nutrient intakes of two groups according to their alcohol intake, smoking habits, regular exercise patterns, menopause status and obesity levels. The subjects consisted of 180 clinically normal adults (males 89, females 91) in the Youngdong area. There were significant differences in the triglyceride (TG) concentrations between the alcohol consumers (169.3 ± 130.0 mg/dl) and the non-alcohol consumers (111.4 ± 64.5 mg/dl), and the smokers (165.0 ± 103.6 mg/dl) and the non-smokers (110.8 ± 39.0 mg/dl). Although regular exercise did not affect the serum lipid levels, the dietary intakes of cholesterol, niacin and phosphate were significantly higher (p < 0.05) in the male exercising group than in the male non-exercising group;and female exercising group consumed more polyunsaturated fatty acids (p < 0.05) than the female non-exercising group. The waist/hip ratio, serum total cholesterol (198.4 ± 36.3 mg/dl) and serum LDL-cholesterol (119.5 ± 34.9 mg/dl) levels of the postmenopausal females were significantly higher than those of the premenopausal females (p < 0.01). The obese males showed higher serum cholesterol, LDL-cholesterol, LDL/HDL, and relative cholesterol levels than those of the normal-weight males;and the obese females showed higher serum TG levels than that of the normal-weight females (p < 0.01). These results suggested that drinking, smoking, menopause and obesity are risk factors for hyperlipidemia. Thus, moderation in alcohol consumption, non-smoking, regular exercise and the maintenance of normal weight are necessary to prevent hyperlipidemia in middle-aged people. (Korean J Community Nutrition 8(5) : 770 ~ 780, 2003)

고등 수학 교수법에 거꾸로 학습을 활용한 사례 연구

남혜원 인하대학교 교육연구소 2019 교육문화연구 Vol.25 No.4

According to the revised 2015 curriculum, the scope of mathematics for high school students has been reduced and college students have to study more. The professor adopted a teaching method that unilaterally conveys the contents in order to teach a lot of contents of the curriculum. Students affected by various media feel bored with the unilateral teaching of professors. Therefore, it is necessary to diversify the education methods of universities according to the changing students. The purpose of this study is to analyze the students’ attitude change and academic achievement by applying the flipped learning which is used in the secondary education field to the lesson of the university. The flipped learning can reduce the abandonment rate of students who did not participate in class because of the lack of basic knowledge and they could change their negative thoughts on mathematics. The flipped learning is one of the effective ways to gain interest in class to students who want to acquire credit only. The flipped learning is an effective way to increase students' academic achievement by making mathematics interesting for students with low math skills. 개정된 2015 교육과정에 따라 고등학생이 학습한 미분적분학의 범위가 줄었고, 이에 대학교에 진학한 학생에게전달해야 하는 내용이 많아졌다. 반면에 다양한 형태의 미디어에 노출이 많은 학생은 교수자에 의하여 진행되는전통적인 강의식 수업에 적응하지 못하고 단순한 학점 취득을 목표로 수업에 참여한다. 따라서 대학에서도 변화하는학생들의 성향에 맞추어 교육 방법을 다양화하는 것이 필요하다. 본 연구는 초. 중등교육 현장에서 활용되고 있는거꾸로 학습을 대학의 교과목인 미분적분학 수업에 적용하고 학생들의 태도 변화와 학업 성취도를 분석함으로써적용 가능성을 확인하고자 한다. 거꾸로 학습을 통하여 기초 지식의 부족으로 수업에 참여하지 않던 학생들의 학업포기 비율을 줄일 수 있으며 이들의 수학에 대한 부정적인 생각에 변화를 줄 수 있다. 거꾸로 학습은 수학 과목의학업 성취도가 낮은 학생에게 교과목에 관한 관심과 흥미를 갖도록 하여 학업 성취도를 높일 수 있는 효과적인방법이다.

여성 베이비부머들의 식생활 태도와 미래 식생활 요구도 조사

남혜원,명춘옥,박영심 한국식품영양학회 2013 한국식품영양학회 학술대회논문집(학술심포지움) Vol.2013 No.12

한국화를 이용한 3D 입체영상 콘텐츠 제작

남혜원,추신,최유미,홍성욱 한국애니메이션학회 2009 한국애니메이션학회 학술대회지 Vol.2009 No.11

중,고등학생의 수산물 이용 음식에 대한 이용실태와 선호도 및 학교급식에서의 요구도 조사

남혜원,이민준,이영미 한국조리과학회 2002 한국식품조리과학회지 Vol.18 No.1

A study on the seafood consumption was conducted from 1902 adolescent students (1110 boys and 792 girls) attending middle or high school to assess the attitude and degree of satisfaction for seafood being served in the school lunch program and ultimately to promote greater seafood consumption. A self-administered questionnaire was used to record the results. The results were as follows: Sixty percent of the respondents appeared to like or not to be reluctant to seafood. The main reasons for favoring seafood were its nutritious effect and taste. On the other hand, the reason for disliking seafood was due to its peculiar smell. In terms of cooking methods, the subjects preferred raw, fried, and grilled seafood, whereas they disliked salt-fermented, seasoned and stewed dishes. The highly preferred seafoods were crab, shrimp, tuna and squid. Only 6.6% of middle school students (MS) and 3.7% of high school students (HS) liked the seafood served in school lunch program, whereas the others responded ‘so so’or disliked it. The reasons for disliking seafood being served in school lunch program were poor taste (14.7% of MS, 23.5% of HS), lack of freshness(6.3% of MS, 13.9% of HS) and unattractable cooking methods(3.4% of MS, 11.1% of HS). To promote seafood consumption in school lunch program, the subjects anticipated the taste improvement (37.7% of MS, 48.5% of HS), use of a variety of seafood (19.8% of MS, 24.0% of HS) and cooking methods(12.6% of MS, 22.4% of HS). Above results suggested that further efforts are needed to provide preferred cooking methods and seafood items as a way of increasing seafood acceptability.

음향광학 단층촬영(Acousto-Optical Tomography)의 수학적 모델과 수치해석적 시뮬레이션

남혜원,허장용,김소영,이레나,Nam, Hae-Won,Hur, Jang-Yong,Kim, So-Young,Lee, Re-Na 한국의학물리학회 2012 의학물리 Vol.23 No.1

본 연구는 최근 의공학 분야에서 중요한 영역으로 대두되고 있는 광학과 초음파의 장점을 결합한 영상 방법인 AOT (Acousto-Optical Tomography)의 수학적 모델을 제시하였다. AOT는 광학 필드를 초음파 기둥에서 변화 시켜서 초음파 기둥의 위치 정보를 이용하여 영상을 재구성하는 방법이다. AOT의 수학적 모델은 두 단계로 나뉠 수 있다. 첫 번째 단계에서는 광학 필드의 복원을 하고, 두 번째 단계에서는 획득한 광학 필드를 기반으로 확산 방정식의 역문제를 풀어 흡수함수 ${\mu}$ (absorption coefficient)를 산출한다. 본 연구에서는 두 번째 단계에 해당하는 역문제의 해를 구하기 위하여 수치해석적인 최소화 문제로 변환하고, 수치적 팬텀을 이용하여 시뮬레이션 하였다. 전통적인 기울기 하강 방법을 이용하여 역 문제 시뮬레이션의 결과를 보였다. 전변동 정규화 기반의 최소화 문제를 제안하여 기울기 하강 방법의 결과에서 보인 번짐 효과를 개선하였다. In this paper, Acousto-Optical tomography is modeled by a linear integral equation and an inverse problem involving a diffusion equation in n-spatial dimensions. We make two-step mathematical model. First, we solve a linear integral equation. Assuming the optical energy fluence rate has been recovered from the previous equation, the absorption coefficient ${\mu}$ is then reconstructed by solving an inverse problem. Numerical experiments are presented for the case n=2. The traditional gradient descent method is used for the numerical simulations. The result of the gradient descent method produces the blurring effect. To get rid of the blurring effect, we suggest the total variation regularization for the minimization problem.

편미분 방정식 연구에 응용되는 위상적 방법론

남혜원 남서울대학교 2007 남서울대학교 논문집 Vol.13 No.3

자연과학분야와 사회과학분야에서 발생하는 다양한 비선형 항을 포함하는 비선형 편미분방정식은 범함수의 특이점을 구하는 문제로 변형된다.안정된 특이점인 극대와 극소 및 불안정한 특이점인 안장점을 찾는 방법은Morse index와 Minimax를 이용하는 두 가지 위상적 방법으로 분류된다. 최근 여러 종류의 비선형방정식에 적용되는 Minimax 방법들이 발견되었다.본 논문은 다양한 위상적 방법을 관찰하고 일반화시킴으로비선형 방정식해의 존재성 및 다중성을 입증함에 응용하고자 한다.