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열처리 조건이 PLLA SDY 섬유의 열적 특성 및 물성에 미치는 영향
김민섭,김영호,Kim, Min-Sup,Kim, Young-Ho 한국섬유공학회 2009 한국섬유공학회지 Vol.46 No.6
Poly(L-lactic acid) (PLLA) filament fibers were prepared by one-step melt spinning process with spin drawing and the effects of the annealing at $100^{\circ}C$ and $120^{\circ}C$ on their thermal and mechanical properties were investigated by using a differential scanning calorimeter (DSC), dynamic mechanical analyzer (DMA), and universal testing machine (UTM). The glass transition temperature ($T_g$) of the PLLA spin draw yarn (SDY) fibers increased with increasing annealing time while the melting temperature ($T_m$) remained unaffected. The birefringence increased with increasing time at both $100^{\circ}C$ and $120^{\circ}C$, indicating the enhanced orientation of the polymers in the fiber. The tenacity of the fibers increased to almost double, while the elongation at break decreased to almost half by 5 minutes annealing at both $100^{\circ}C$ and $120^{\circ}C$. However, annealing time of more than 5 minutes did not affect the tenacity and elongation at break. The boiling water shrinkage (BWS) decreased continuously with increasing time, the increment was larger for the annealing at $120^{\circ}C$ than that at $100^{\circ}C$. A BWS of less than 3% was obtained by annealing at $120^{\circ}C$ for 30 minutes.
열처리한 PLLA SDY 섬유의 방사광 광각 X-선 회절 분석
김민섭,김영호,Kim, Min-Sup,Kim, Young-Ho 한국섬유공학회 2010 한국섬유공학회지 Vol.47 No.1
Poly(L-lactic acid) (PLLA) filament fibers prepared by one-step melt spinning process with spin drawing were annealed at $100^{\circ}C$ and $120^{\circ}C$ and the effects of annealing on the crystal structure, crystallinity, and orientation of PLLA were studied by using synchrotron wide angle X-ray diffraction (WAXD) method. The PLLA SDY fibers of this study showed an ${\alpha}$-form crystal structure which was not affected by the annealing. The crystallity, crystallite size of the (200) plane of ${\alpha}$-form crystal, total orientation (${\Delta}n$), and crystalline orientation ($f_c$) increased with increasing annealing time up to 30 minutes at 100 and $120^{\circ}C$.
Biodegradable Nanoparticles for Nanomedicines
Min Sup Kim(김민섭),Sang Jun Park(박상준),Bon Kang Gu(구본강),Chun-Ho Kim(김천호) 한국고분자학회 2015 폴리머 Vol.39 No.6
최근 들어 나노의학에 사용되는 생분해성 나노입자는 치료용 제제를 효과적으로 전달하기 위한 전달체로 큰 주목을 받고 있다. 특히, 생분해성 고분자를 기반으로 제조한 나노입자는 친수성 담지 약물의 안정성 유지한 상태로 약물을 전달하고자 하는 부위로 찾아가 약물의 서방형 방출거동을 통해 약물의 효과를 극대화하며 약물에 의한 부작용을 최소화해야 할 것이다. 따라서 본 고에서는 나노의학에 응용이 가능한 생분해성 물질인 단백질과 다당류 등과 같은 천연고분자에 대한 소개와 이를 이용한 나노입자의 제조 방법에 대해 소개하였다. Biodegradable polymeric nanoparticles (NPs) have shown significant therapeutic potential as nanomedicines for delivery of pharmaceutical agents. NPs made of biodegradable polymers can efficiently deliver drugs for sustained, controlled and targeted release, enhancing the stability of hydrophilic bioactive molecules, thereby improving their therapeutic efficacy while reducing their side effects. This paper reviews candidate biodegradable materials for NPs, including proteins and polysaccharides, and their methods of NP fabrication for nanomedicines.
8주간 강화 훈련 프로그램이 스키 선수의 체수분 조절 호르몬 및 무산소 운동능력에 미치는 영향
김진해 ( Jin Hae Kim ),전명규 ( Myung Kyu Jun ),김민섭 ( Min Sup Kim ) 한국스포츠리서치 2007 한국 스포츠 리서치 Vol.18 No.4
The purpose of this study was to investigate the effect of 8weeks exercise training program on body fluid regulatory hormone(aldosterone, renin, ACTH) and anaerobic power of ski players. Fourteen subjects participated in this study and were divided regular training group(n=7) and enhanced training program group(n=7). All exercise sessions took place on a Monark ergometer, performing graded maximal exercise. Blood sample collected rest, immediately exercise. Acute exercise significantly increased blood aldosterone, renin, ACTH level. But 4weeks enhanced training did not induce any significant change on aldosterone, renin and ACTH. Relative peak anaerobic power decreased significantly after enhanced training program. In conclusion, acute exercise increased body fluid regulatory hormone and enhanced training program attenuated anaerobic peak power. Further study needed to elucidate the exact mechanism related to other fluid regulatory hormone, electrolyte and conditioning period.
쇼트트랙스피드스케이팅의 새 출발기법에 대한 기술동작 분석
전명규 ( Myung Kyu Jun ),김민섭 ( Min Sup Kim ) 한국스포츠정책과학원(구 한국스포츠개발원) 2004 체육과학연구 Vol.15 No.4
본 연구의 목적은 쇼트트랙스피드스케이트 국가 대표선수 남자 2명과 여자 2명을 대상으로 새 출발기술 동작과 기존의 출발기술 동작의 비교 분석을 통하여 선수 개인특성에 맞는 기술을 개선하고 발전시키는 기초 자료로 제공하는 데 있다. 출발기술동작의 운동학적 분석요인은 글라이딩 시간과 거리, 푸시오프의 전경각과 무릎관절의 각도 변화, 신체중심의 추진각 그리고 푸시오프에 의해 신체중심의 증가된 속도에 따른 운동에너지와 파워를 분석하였다. 결과는 다음과 같다. 글라이딩 시간과 거리는 각 대상자들의 특성에 따라 다르게 나타났으나, 새 출발기법(NT)은 기존출발기법(NT)보다 평균 글라이딩 시간이 비교적 짧아지거나 같은 반면에 글라이딩 거리는 길게 나타나는 경향을 보였다. 이에 단위시간 당 평균 진행변위는 NT가 TT보다 더 크게 나타났다. 블레이드 착지와 이탈 이벤트의 평균 전경각의 차는 약 34° 이며, NT와 TT가 유사하게 나타났다. TT와 NT의 푸시오프 무릎각은 블레이드 착지 이벤트의 평균 108.6°와 107.9°로 나타났고, 블레이드 이지 이벤트에서는 평균 142.6°와 136.3°로 나타났다. 이에 블레이드 착지에서는 두 비교대상이 큰 차이를 보이지 않았으나, 블레이드 이지에서는 NT가 TT보다 작은 각도를 보였다. 푸시오프에 따른 TT와 NT의 신체중심의 추진각(Pθ)은 평균 83.4∼85.4°로 나타났다. 푸시오프의 평균 파워는 각 대상자마다 다양한 크기로 나타났으며, TT와 NT의 평균파워는 M1이 7.1과 7.0(W), M2가 2.9와 5.8(W), F1은 2.8과 2.7(W) 그리고 F2는 6.2과 5.0(W)로 나타났다. This study was to analyze the new starting technique(NT) and the existing starting technique(TT) on the nationally ranked two male and two female players, and to grope the better starting technique suited the characteristics of each individual player. The analyzed kinematical factors were the gliding time and distance, the leaning angle during push-off, the change of knee joint angle, the propulsive angle of c.o.g, and the kinetic energy and power by the increased velocity of c.o.g during push-off. From those analysis, the following results were drawn. The gliding time and distance were different from the characteristics of each individual player, but the new technique indicated shorter or almost the same in average gliding time and longer in gliding distance than the existing starting technique(TT). The new technique showed longer in average progressive displacement per time unit. The difference of average leaning angle between blade end on and off event was about 34 degrees, but showed the similar pattern between two techniques. In the blade end on event, knee joint angle at push-off of the new and existing techniques were average 136.3 degrees and 142.6 degrees, respectively. There was no differences between two techniques in the blade end on event, but the new technique showed smaller angle in the blade end off event. The propulsive angles of c.o.g(Pθ) during push-off of the new and existing technique were average 83.4 degrees and 85.4 degrees, respectively. Average power during push off phase varied among players, and the average powers of the new and existing techniques were respectively 7.1W and 7.0W in M1, 2.9W and 5.8W in M2, 2.8W and 2.7W in F1 and 6.2W and 5.0W in F2.
체육학습지도에 있어서 「교수 스타일의 연속체 모델」 분석
육조영,최경범,김민섭 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.5
Mosston's spectrum of teaching style is one of the well -known concepts as a teaching method of physical education in the United States. But, unfortunately it has not teen discussed enough in Korea, Describing this unique model, this study clarifies its limit and possibility. Mosston's model presents many teaching styles which are different in sharing decision making between a teacher and student, Mosston emphasises teacher behavior rather than student behavior. This indicates that he is much concerned with the initiative at a teacher in the class, This paper argues that it is necessary to describe into details about relationships between student behavior and objectives (outcomes), because the student behavior is equally important to achieve the educational goal. Therefore, this study insists that Mosston's model should be revised with the classification based on 1) teacher centered type, 2) teacher-student type, 3) student centered type, and 4) student independent type. In addition, the model should be redefined in light of the way to organize students: 1) whole class type, 1) small group type, 3) peer tutoring type, 4) individualized type. In short, these propositions are useful to verify effectiveness of each style positively, and to modify Moss ton's model through the planning-process-product study.