• 한방비만학회지
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• 제17권1호
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• pp.54-60
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• 2017

비만을 주소증으로 내원하여 LFT를 시행하고, 한약 치료를 포함한 비만 치료 경과 후 다시 추적한 결과 체중 감량과 간효소 수치의 개선 경향을 보인 10예를 보고하였다. 본 연구를 토대로 한약 치료를 포함한 한방 비만치료 시 유효성과 안전성에 대한 근거를 더 확보해나갈 수 있을 것으로 생각된다.

• Clinical and Experimental Pediatrics
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• 제48권6호
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• pp.588-593
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• 2005

목 적 : 비만아에서 폐기능 검사와 체성분 분석을 시행함으로써 비만이 폐기능과 체성분에 미치는 영향을 밝히고자 하였다. 방 법 : 9세에서 12세의 중등도 이상의 비만 소아 27명과 정상 대조군 20명을 대상으로 체성분(세포내액, 세포외액, 단백질, 무기질, 근육량, 체지방량, 체지방률, 복부지방률)을 분석하였다. 헤모글로빈, 혈당, aspartate aminotransferase(AST), alanine aminotransferase(ALT), 총 콜레스테롤, 혈중 중성지방을 측정하였고 폐기능 검사를 시행하였다. 결 과 : 중등도 이상의 비만 소아에서 peak expiratory flow rate(PEFR)이 정상군에 비해 유의하게 감소하였고, 고도 비만아에서 중등도 비만아보다 세포내액, 단백질, 체지방량, 체지방률, 복부지방률이 유의하게 높았고, peak expiratory flow rate(PEFR)은 고도 비만아에서 유의한 감소를 보였다. peak expiratory flow rate(PEFR)이 비만 소아 중 37.0%에서 감소하였고, forced expiratory flow 25%($FEF_{25}$)와 mid-expiratory flow rate(MEFR)이 14.8%에서, forced expiratory flow 50%($FEF_{50}$)이 11.1%에서, forced expiratory volume in 1st second($FEV_1$)과 FVC가 3.7%에서 감소하였다. 결 론 : 본 연구 대상인 9-12세 소아에서 비만도, 체지방률과 폐기능 측정치와 상관성은 없었지만, 중등도 이상의 비만 소아에서 peak expiratory flow rate(PEFR)이 감소하는 결과를 보이므로 중등도 비만 소아에서 폐기능 검사를 시행하는 것이 좋으며 앞으로 다른 연령군의 비만 소아에서 폐기능 검사에 대한 연구가 필요할 것으로 생각한다.

• 한국지진공학회논문집
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• 제10권6호
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• pp.19-28
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• 2006

기존의 유한요소모델개선기법들은 측정에 의한 모달 데이터와 해석적으로 계산된 시스템 행렬로 구성된 수학적인 목적함수를 사용하거나 업데이팅 변수에 관한 모달 특성의 미분함수를 사용하여야만 한다. 따라서 교량구조물과 같은 복잡한 구조물에의 적용이 어렵고 역해석에 있어 해의 안정성 문제가 발생할 수 있다. 또한 개선된 모델이 물리적인 의미를 지니지 못할 수도 있다. 본 논문에서는 유전자알고리즘과 Welder-Mead의 심플렉스기법을 사용한 하이브리드 최적화 유한요소모델개선기법을 제안하였다. 하이브리드 최적화 기법의 성능을 검증하기 위해 3개의 국부최소값과 1개의 전체최소값을 갖는 Goldstein-Price 함수를 사용하여 비선형문제에 대한 적용성을 검토하였다. 또한 최적화목적함수의 영향을 검토하기 위해 10개의 자유도를 갖는 스프링-질량 모델을 사용하여 변수연구를 수행하였다. 최종적으로 수치해석을 통해서 질량과 강성을 동시에 개선하기 위한 최적화 목적함수를 제시하고, 제안된 하이브리드 최적화 기법이 유한요소모델개선을 위해 매우 효과적인 방법임을 입증하였다.

• 천문학회지
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• 제28권2호
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• pp.153-167
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• 1995

More than 22,300 stars in NGC 6752 were measured over the region of 5' < r < 23' in B and V AAT plates. The most of these are main sequence(MS) stars and about 130 blue horizontal branch(BHB) stars were detected. The C-M diagram of all measured stars shows gaps appearing at $V{\approx}15.^{m}2$ and $16.^{m}2$ along the red giant branch(RGB) and their appearance shown by Lee & Cannon(1980) is found to be independent of measured region. The bimodal distribution of BHB stars is confirmed again and a wide gap shown by Lee & Cannon(1980) at $V{\approx}16^m$ is clearly seen for stars in the outer part (8' < r < 13') in the cluster. It is noted, however, that this gap is occupied by about a dozen of BHB staIs located in the inner region (5' < r < 8'). The number ratio of bright BHB star (V < $15^m$) to faint BHB stars (V > $15^m$) decreases with increasing radial distance from the cluster center. Three faintest BHB stars were found, and two stars ($V{\approx}18.^{m}5$) of there are located in the inner region of $r{\approx}6'$ and the other faintest one ($V{\approx}19.^{m}3$) located in the outer part of $r{\approx}13'$. Also a bluest star of (B - V) $\approx$ -0.5 at $V{\approx}17.^{m}2$ is found but it is located at the outer part of $r{\approx}13'$ in NE region. Therefore, the membership of the faintest BHB star and bluest star is suspected. The luminosity function(LF) and mass function(MF) for NGC 6752 were derived for MS stars. The LF for stars of $M_v\;<\;6^m$ in the outer part of r > 8' shows a consistency with that derived by Penny & Dickens(1986).

• 정형스포츠물리치료학회지
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• 제14권2호
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• pp.81-90
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• 2018

Purpose: The purpose of this study was to investigate the effect of boxing combined training on cardiopulmonary function and health-related fitness in male college students over a period of eight weeks. Methods: Eighteen male students were randomly assigned to the following groups: boxing exercise (n=6), aerobic exercise e(n=6), and non-exercise (n=6). The exercise program was conducted for 50 minutes every three weeks, for a total of eight weeks. After eight weeks, the factors that affected the measurement variables were analyzed, and the following results were obtained. Results: Participants in the eight-week boxing exercise group and the aerobic exercise group showed significantly increased maximal oxygen, which was not observed in the control group. The body mass index decreased in the aerobic exercise group, but did not significantly differ between the boxing exercise and control groups. Body fat (%) and abdominal fat (%) significantly decreased in all exercise groups, but significantly increased in the control group. Skeletal muscle mass increased in the boxing exercise group, but did not significantly differ between the boxing, aerobic exercise, and control groups. Muscular strength and muscular endurance increased in both exercise group, but did not change in the control group. Flexibility showed no differences between the groups. Conclusions: In conclusion, an eight-week boxing exercise program for college students showed positive effects on cardiorespiratory function and health-related fitness.

• Tuberculosis and Respiratory Diseases
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• 제54권2호
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• pp.210-218
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• 2003

연구배경 : 폐기능 검사는 폐질환을 진단하는 가장 기본적인 검사방법이며, 현재 연령과 신장을 포함하는 폐기능 검사의 예측식이 많이 이용되고 있다. 체성분 중 체지방량의 감소는 폐용적 증가와 상관관계가 있으며, 제지방량은 대개 근육으로 구성되어 있어 호흡근 훈련을 포함하여 물리적인 노력에 의해 증가될 수 있다. 이런 관점에서 볼 때 체지방량과 근육량의 변화는 폐기능에 영향을 미칠 가능성이 많다. 본 연구는 연령과 신장 뿐만 아니라 체질량지수, 체지방률, 제지방지수가 노력성 폐활량, 1초간 노력성 호기량, 노력성 호기중간유량 등 노력성 호기곡선에 미치는 영향을 알아보고자 하였다. 방 법 : 2000년 1월부터 2001년 12월까지 영남대학교 의과대학 부속병원 건강검진센터를 방문한 사람 중 폐기능 검사와 체성분 분석을 시행하여 폐기능이 정상이고 과거 특이한 병력이 없으며 검진 결과가 정상인 300명(남자 : 150명, 여자 : 150명) 평균 연령은 $45{\pm}13$세였다. 폐활량 측정법을 이용하여 측정한 폐기능 검사결과와 체성분 분석결과를 이용하여, 이들간의 관계를 다중회귀분석을 이용하여 분석하였다. 결 과 : 남자의 경우 노력성 폐활량을 설명하는데 제지방지수가 통계적으로 유의하였으며(p<0.05, $r^2=0.432$), 1초간 노력성 호기량을 설명하는데 체지방률과 제지방지수가 통계적으로 유의하였다(p<0.05, $r^2=0.567$). 여자의 경우 노력성 폐활량과 1초간 노력성 호기량을 설명하는데 체질량지수(FVC: p<0.05, $r^2=0.435$, $FEV_1$: p<0.05, $r^2=0.597$)와 체지방률(FVC: p<0.05, $r^2=0.491$, $FEV_1$: p<0.05, $r^2=0.654$)이 통계적으로 유의하였으며, 노력성 호기중간유량은 체지방률과 유의한 관련이 있었다(p<0.05, $r^2=0.337$). 결 론 : 체질량지수 및 체지방률 그리고 제지방지수는 노력성 폐활량, 1초간 노력성 호기량에 영향을 미치는 독립변수로 생각되며, 이들 체성분을 고려한 폐기능 검사도 임상에서 활용할 수 있을 것으로 생각된다.

• Nuclear Engineering and Technology
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• 제52권4호
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• pp.846-855
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• 2020

A loose part monitoring system is used to detect unexpected loose parts in a reactor coolant system in a nuclear power plant. It is still necessary to develop a new methodology for the localization and mass estimation of loose parts owing to the high estimation error of conventional methods. In addition, model-based diagnostics recently emphasized the importance of a model describing the behavior of a mechanical system or component. The purpose of this study is to propose a new localization and mass-estimation method based on finite element analysis (FEA) and optimization technique. First, an FEA model to simulate the propagation behavior of the bending wave generated by a metal sphere impact is validated by performing an impact test and a corresponding FEA and optimization for a downsized steam-generator structure. Second, a novel methodology based on FEA and optimization technique was proposed to estimate the impact location and mass of a loose part at the same time. The usefulness of the methodology was then validated through a series of FEAs and some blind tests. A new feature vector, the cross-correlation function, was also proposed to predict the impact location and mass of a loose part, and its usefulness was then validated. It is expected that the proposed methodology can be utilized in model-based diagnostics for the estimation of impact parameters such as the mass, velocity, and impact location of a loose part. In addition, the FEA-based model can be used to optimize the sensor position to improve the collected data quality in the site of nuclear power plants.

• 대한기계학회논문집B
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• 제22권4호
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• pp.489-498
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• 1998

Among the heat/mass exchange units composing an absorption system, the absorber, where the refrigerant vapor is absorbed into the liquid solution is the one least understood. In the present study, the effects of non-absorbable gas on the absorption process of aqueous lithium bromide solution falling film inside a vertical tube were experimentally investigated. In the range of film Reynolds number of 30 ~ 195, heat and mass transfer characteristics were investigated as a function of non-absorbable gas volumetric concentration, 0.2 ~ 20%. An increase of non-absorbable gas volumetric concentration degraded the mass transfer rate dramatically in the absorption process. The reduction of mass transfer rate was significant for the addition of small amount of non-absorbable gas to the pure vapor. At film Reynolds number of 130, an increase of non-absorbable gas concentration from 0.2 to 6.0% resulted in the decrease of mass transfer rate by 36% and 20% of non-absorbable gas by 59%. However the decrease of film Nusselt number with the increase of volumetric concentration of non absorbable gas was relatively smaller than the decrease of Sherwood number. Critical film Reynolds number was identified to exist for the maximum heat and mass transfer regardless of the volumetric concentration of non-absorbable gases.

• Geomechanics and Engineering
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• 제11권1호
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• pp.77-94
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• 2016

A forked tunnel, as a special complicated underground structure, is composed of big-arch tunnel, multi-arch tunnel, neighborhood tunnels and separate tunnels according to the different distances between two separate tunnels. Due to the complicated process of design and construction, surrounding jointed rock mass stability of the big-arch tunnel which belongs to the forked tunnel during excavation is a hot issue that needs special attentions. In this paper, an elasto-plastic damage constitutive model for jointed rock mass is proposed based on the coupling method considering elasto-plastic and damage theories, and the irreversible thermodynamics theory. Based on this elasto-plastic damage constitutive model, a three dimensional elasto-plastic damage finite element code (D-FEM) is implemented using Visual Fortran language, which can numerically simulate the whole excavation process of underground project and perform the structural stability of the surrounding rock mass. Comparing with a popular commercial computer code, three dimensional fast Lagrangian analysis of continua (FLAC3D), this D-FEM has advantages in terms of rapid computing process, element grouping function and providing more material models. After that, FLAC3D and D-FEM are simultaneously used to perform the structural stability analysis of the surrounding rock mass in the forked tunnel considering three different computing schemes. The final numerical results behave almost consistent using both FLAC3D and D-FEM. But from the point of numerically obtained damage softening areas, the numerical results obtained by D-FEM more closely approach the practical behaviors of in-situ surrounding rock mass.

• 천문학회보
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• 제33권1호
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• pp.34.1-34.1
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• 2008