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조남주,한태경,우상구 한국스포츠학회 2015 한국스포츠학회지 Vol.13 No.4
This research aims to investigate the effects of a 12-week yoga exercise on the exerciser’s autonomic nervous system and lung capacity, and thereby providing a basic data on the psychologically and physically stabilizing effects of yoga exercise. In order to analyze the material characteristics of the collected data through technical statistics and to verify the research purpose and research hypothesis based on the research model, the statistical program SPSS Ver. 20 was used, and as for the data treatment method, T-test was conducted, which produced the following conclusion. First, as a result of investigation of the pre-and post-experiment effects on the autonomic nervous system, it was turned out that there were significant results in terms of autonomic nervous system stability (p =.049), HF(p =.19), and parasympathetic system activity (p=.016). Second, there were no significant results in the pre- and post- experiment of lung capacity (FVC, FEV, FVC/FEV1). Third, there were significant results in the pre- and post- experiment, in terms of body weight (p=.30), BMI (p=.38), body fat ratio (p=.31), and body fat amount (p=.13). Based on these results, it was concluded that the 12 week-yoga exercise has significant influence on the autonomic nervous system and body composition. This study verified that application of a yoga program not accompanied by breath technique or meditation but only comprised of physical movement brings positive change physically, as well as in terms of the psychological and mental stability. For people approaching yoga as an exercise, it also produces psychological stabilization effects, enabling the yoga exercisers to control stress and anxiety as well as improve their health, thereby contributing to a physically and mentally balanced and healthy life of modern people.
모듈요소(modular elements)와 가구의 구조적 특성에 관한 연구
조남주,Joh Nam-Joo 한국가구학회 2003 한국가구학회지 Vol.14 No.1
Today's aesthetics and design orientations seem to be: flexibility, mobility, multi-functionality required front user's new needs. Our spaces have changed increasingly contain the needs of constant mobility and ability to adapt to a wide variety of situations. For efficient use, a modular system in furnishing can manage the spaces with components which are easy to assemble and disassemble. The function comes from spacial technological structure that is an 'union' formed by units to joint each other. The repeated module is tailored to unchanging environmental conditions. On the other hand, the structure defined by change reacts flexibility to a dynamic environment. In decision-making, it is flexible and able to adapt. Their ability to be positioned freely anywhere in the room allows individual tasks to be carried out by different people, and their almost endless variety of uses create distinctive spaces for living.
Water-Induced Surface Structure of Poly(dimethylsiloxane)-Containing Block Copolymers
조남주,천제환,임권택,장의섭,이원기 한국고분자학회 2013 Macromolecular Research Vol.21 No.7
Two triblock copolymers, polyester-b-poly(dimethylsiloxane) (PDMS)-b-polyester, were synthesized by the ring-opening polymerization with both hydrophobic and water-repellent hydroxyl-terminated PDMS and hydrolytically degradable ester monomers. The Tgs of the polyester blocks were controlled by ε-caprolactone/lactide mixture or lactide only. The surface composition of the triblock copolymers was measured by angle-dependent electron:X-ray photoelectron spectroscopy. The results showed that the PDMS block with a low surface energy in the copolymers was quite segregated in the surface region; the copolymer films showed significantly higher mole fractions of PDMS (0.78-0.86) at a low takeoff angle compared with their bulk mole fractions (0.015-0.02). When the films were exposed to water at 20 oC for 70 min, the mole fractions of surface PDMS were decreased to 0.3-0.5 because of the water-repellent hydrophobicity and the chain mobility of both blocks.
고분자재료의 피로과정에서의 비선형 동적 점탄특성 평가법
조남주 한국유변학회 1997 Korea-Australia rheology journal Vol.9 No.3
내피로성은 기계적 구조물로 사용되는 고분자재료에는 반드시 필요한 성질이며, 피 로거동은 재료특유의 비선형 동적 점탄특성과 아주 밀접한 관계가 있다. 본 연구에서는 피 로과정에서의 비선형 동적 점탄특성을 정량적, 연속적으로 측정할수 있는 시험 기기와 가해 준 변형에 대한 응답 응력파의 기본 응력파(선형적 응답)로부터의 차이를 직접 측정하여 이 를 규격화한 비선형 점탄성파라미터, NVP(Nonlinear Viscoelastic Parameter)라 명명한 새 로운 평가방법을 개발하였다. 그리고 고밀도 폴리에틸렌(HDPE) 배향물을 사용하여 그 평가 방법의 타당성을 조사한 결과 피로과정에서의 비선형동적 점탄특성을 나타내는 NVP가 증 가함에 따라 재료의 피로수명은 감소하였다. 따라서 NVP가 고분자재료의 내피로성을 평가 하는 척도로서 사용가능하다는 사실이 증명되었다. 또한 각 고조파 성분에대해 조사한 결과 인장형 피로시험양식에서는 고체입자 분산계의 전단변형에서 나타난 비선형 점탄성의 결과 와는 달리 2차 성분의 크기가 가장컸으며 NVP에의 기여도도 가장 크게 나타났다. 이는 변 형양식의 차이에 따른 결과를 볼수 있다.