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유화-확산법을 이용한 폴리스티렌 방향 나노 입자의 제조: 특성 및 방출 거동
이소민,손성옥,김윤미,이홍열,김민관,최진현,김한도,Lee, So-Min,Sohn, Sung-Ok,Kim, Yun-Mi,Lee, Hong-Youl,Kim, Min-Kwan,Choi, Jin-Hyun,Ghim, Han-Do 한국섬유공학회 2007 한국섬유공학회지 Vol.44 No.1
An attempt was carried out to suggest a nano-sized agent for durable fragrant finishing of fabrics. By adopting emulsification-diffusion method, we could prepare polystyrene (PS) aromatic nanoparticles (ANP) with lavender oil (LO) in core. Effects of process parameters on mean particle sire and its distribution of PS-ANPs were also examined. With controlled preparative condition, we could obtain PS-ANPs of diameters ranging 200 to 400 nm with narrow distribution. PS-ANPs were coated with poly(vinyl alcohol) layer to restrict the diffusion of LO from PS-ANPs. Sustained release properties of PS-ANPs were also evaluated.
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필라테스 매트 운동이 20대 여성의 골반과 척추의 관절각에 미치는 영향
이지혜(Ji-Hye Lee),이홍열(Hong-Youl Lee),유경태(Kyung-Tae Yoo) 한국엔터테인먼트산업학회 2014 한국엔터테인먼트산업학회논문지 Vol.8 No.3
본 연구의 목적은 하이힐을 즐겨 신는 20대 여성들에게 필라테스 매트운동이 골반의 기울기와 척추의 만곡에 어떠한 영향을 주는지 알아보았다. 하이힐을 주 4회 이상 신는 여학생들을 대상으로 4주간 필라테스 매트운동을 실시한 후 3차원 영상분석기로 촬영한 결과, 골반의 PO DL-DR 값이 집단 간에 유의하게 나타났고, 필라테스 매트운동 집단이 사전 사후 간 유의한 차이가 나타났으며, 척추의 후만각(Kyphotic angle)에서 집단 간 유의한 차이가 나타났으며, 필라테스 매트운동 집단에서 사전 사후 간 유의한 차이가 나타났다. 이러한 결과를 종합해 보면 하이힐을 즐겨 신는 여성에게 4주 간의 필라테스 매트운동은 골반의 기울기 및 척추의 만곡에 긍정적인 영향을 미치는 요소라는 것을 보여 주며, 필라테스 매트운동이 몸통중심부 근육강화로 신체의 균형이나 신체 정렬 및 협응성 등에 긍정적인 영향을 미친 것으로 사료되어진다. The purpose of this study is to identify the effects of Pilates mat exercises on the pelvic inclination and spinal curvature of women in their 20s, who enjoy wearing high heels. Female students who wear high heels four or more times each week were ;ed to perform Pilates mat exercise for four weeks. They were then filmed using three-dimensional image analysis device. As a result, the PO DL-DR values in the pelvis showed a statistically significant difference between the groups, and the Pilates mat exercise group exhibited a statistically significant after the experiment. In addition, the kyphotic angles in the spine showed a statistically significant difference between the group, and the Pilates mat exercise group revealed a statistically significant difference after the experiment. These results suggest that four-week Pilates mat exercises in women enjoying wearing high heels are an element that positively influences their inclination and spinal curvature. Pilates mat exercise may have had positive effects on their physical balance, alignment, and coordination by strengthening the muscles in the center of their trunks.
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고혈압 전단계 여성에 대한 골격근 group Ⅲ 기계적 수용기 자극 시 심혈관에 미치는 영향
박승애(Seung-Ae Park),최현민(Hyun-Min Choi),유승희(Seung-Hee Yoo),박태웅(Tae-Woong Park),노호성(Hosung Nho),이홍열(Hong-Youl Lee),김종경(Jong-Kyung Kim) 한국생활환경학회 2010 한국생활환경학회지 Vol.17 No.1
It was suggested that the exercise pressor reflex (EPR) plays an important role to regulate the cardiovascular responses during dynamic exercise. A component of EPR, group Ⅲ mechanoreceptors evoked excessive blood pressure response in hypertensive rats during passive tendon stretch. But it is not known that this exaggerated blood pressure response to passive tendon stretch is mediated by EPR overactivity in prehypertensive women. Therefore, this study was to investigate the physiological responses in both normotension and prehypertension during passive tendon stretch. Twenty subjects (10 prehypertension and 10 normotension) with a mean age 49.0±3.4 years were recruited for this study. All subjects were continuously instrumented to measure stroke volume (SV), heart rate (HR), cardiac output (CO), total vascular conductance (TVC) throughout the experiment. To stimulate the group Ⅲ mechanoreceptors, brief passive dorsiflexion of the foot was performed by a cybex for one minute. The results showed that mean arterial blood pressure was significantly increased during dorsiflexion in both groups, however, this pressor response was significantly higher in prehypertensive women. SV and CO were significantly increased in normotensive women, while there were no differences in prehyperentsive women. There was no difference in HR in both groups. TVC was significantly decreased in prehypertension, while no difference in normotension. It is concluded that the excessive pressor response mediated by dorsiflexion is occurred by overactivity of group Ⅲ mechanorecptors and the mechanism is produced via mainly peripheral vasoconstriction in prehypertensive women.
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Normality of Toeplitz Matrices
Lee, Hong-Youl 又石大學校 1995 論文集 Vol.17 No.-
무한 정규 Toeplitz 행렬의 구조는 Brown과 Halmos의 논문 [1]에서 잘 알려졌지만 유한 정규 Toeplitz 행렬의 구조는 그렇지 못하다. 다만 실수의 유한 정규 Toeplitz 행렬이 대칭 행렬, 반대칭 행렬, 순환 행렬, 반순환 행렬중 어느 하나에 속한다는 것이 추측되었을 뿐이다. 1994년에 실수의 저차원(n=2,…,5)에서 이 추측이 성립한다는 것을 Kh. D. Ikramov[4]가 증명했는데, 본 논문은 이 추측이 일반적으로 성립한다는 것을 보일 것이다.
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Almost Spectrum in the Normed Algebra L(X)
Kim, Young-Tae,Lee, Hong-Youl 성균관대학교 1990 論文集 Vol.41 No.2
本 論文은 노옴 多元環 L(X)에 속하는 有界線型作用素 T에 대하여 λ가 T 의 almost spectrum에 境界上의 集積點이면 λ는 T의 almost essential spectrum의 元素이고, 또한 almost spectrum으로부터 almost essential spectrum의 connected hull을 除去하면 Riesz points만 남는다는 것을 보였다. If λ is an accumulation point of the boundary of the almost spectrum of T then λ is an element of the almost essential specturm of T. Ant if we remove the connected hull of the almost essential spectrum from the almost spectrum, only Riesz points will remain.
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