• Journal of the Korea Convergence Society
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• v.6 no.5
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• pp.329-336
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• 2015

In this study, Pilates mat exercise program three times a week for 8 weeks, 10 minutes for a warm up, 40 minutes of main exercise, and 10-minute cool down exercise using gadgetry to the middle aged women. Pilates exercise program when exercise intensity based on the instructions of the ACSM (2010) as 1-4 weeks 50-60% HRR, 5-8 weeks 61-70% HRR to give 50-70%, maintaining the strength of 4 weeks. Pilates exercise program by gadgetry has increased the strength of wireless heart rate meter (Polar Analyzer, Polar Electro of Finland) Karvonen (1979), proceed individual target heart exercise obtained as a way now to check your strength workout through individual conciousness. We estimated immunoglobulin change for Pilates mat exercise by gadgetry during 8-week. It showed the following conclusions. First, immunoglobulin IgA has been increased and Interaction effects has been showed thruough Pilates mat exercise programs for 8 weeks. Second, immunoglobulin IgG has been increased and showed Interaction effects has been showed thruough Pilates mat exercise programs for 8 weeks. Third, immunoglobulin IgM has been increased and showed Interaction has been showed effects thruough Pilates mat exercise programs for 8 weeks. Therefore, this study was conducted on a Pilates mat exercise using props immune function are positive hormonal changes, can prevent private for the disease and effective exercises that are the fodder.

• The Journal of the Korea Contents Association
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• v.8 no.10
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• pp.45-53
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• 2008

The animatronics technique could be very important fact of technique not only to achieve full completion of visible image but also to offer lots of chances to express images by merging CG, special effects and special devices. In this thesis, we design and implement the Zigbee-based wireless transceiver and communication program to control animal animatronics such as a dog and bear. The wireless control utilizing the Zigbee protocol is that electrically consumption is more small than the Bluetooth and reliability of data transmission is better. The implemented control systems and program have the normal and replay function for control of animal models. This functions and operability are tested by a designed animatronics prototype under the wireless environment.

• Proceedings of the Korean Fiber Society Conference
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• 2001.10a
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• pp.420-423
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• 2001

토목합성재료(Geosynthetics) 중 직포매트는 i) 분리, ii) 보강/보호 등의 기능을 가지고 있으며 연약지반 보강, 도로포장, 간척지 지반 공사 및 해안지역 LNG 저장고 공사, 폐기물 매립지의 사면 및 저면 보호재 등 기초 보강재료로 널리 이용되고 있다. 그러나 현재 토목건설공사에 사용되고 있는 직포매트용 봉합사는 타이어 코드 제조용 폴리에스테르 고강력사이며, 봉합할 경우 원통형 관입에 의한 인장신도가 커지게 되어 변형에 의한 파괴가 쉽게발생한다. (중략)

• Proceedings of the Korean Fiber Society Conference
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• 1998.10a
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• pp.435-438
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• 1998

Textile composites란 직물, 편성물, 브레이드 등을 사용한 섬유강화 복합재료의 총칭으로서 텍스타일이 지닌 뛰어난 기능을 매트릭스에 부가함에 따라 단일재료로는 얻지 못하는 뛰어난 공업재료를 만들 수 있다. 편성물은 직물이나 브레이드에 비해서, 변형특성도 매우 우수하고 고생산성이다. 복합재료에서 강화재로 편성물을 사용하는 경우, 섬유소재, 편조직, 편환 밀도 등을 고려하는 것에 의하여 편성물 강화 복합재료의 역학적 특성이 달라진다. (중략)

• Korean Journal of Materials Research
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• v.6 no.8
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• pp.786-795
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• 1996

The fiber reinforced thermoplastics(FRTP) were prepared with polypropylene fiber(PP) as matrix and polyvinyl alchol(VF), aramid(KF) or polyamide fiber(PAF) as the reinforcing materials using the integrated fiber mixing apparatus. The reinforced thermoplastic sheets were prepared by com¬pression molding and their morphology, rheological and mechanical properties were characterized. In the morphological properties of composites, the wettability of the reinforced thermoplastics were decreased in proportion to the content of fibers. At low angular frequency, the viscosity of PAF /PP and VF/PP composite was increased with the content of reinforced fiber. However at high frequency the viscosity of composite reinforced with 5~20wt% fiber, was shown the reduced values which approaches that of the neat matrix. The mechanical properties of the composite were changed with the content of reinforecd fiber, and VF/PP and KF/PP composite had better properties than PAF/PP system.

• The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.4 no.2
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• pp.46-54
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• 1990

본 연구에서는 에폭시수지에 무기물충진제 SiO2를I첨가하여 제작된 시편의 주파수 및 온도변화에 따른 유전 완화특성을 연구하였다. 연구결과로 제작된 복합재료의 유전특성은 충진제의 함량증가에 따라 유전율은 상당히 증가하였으나 유전손실의 변화는 거의 없었다. 이와같은 사실을 포함한 모든 특성들은 충진제입자가 에폭시 매트릭스에 견고하게 결합되어 있다는 사실과 Maxwell-Wagner의 계면분극이론으로 잘 설명될 수 있다. 제작된 복합재료에 대한 특성의 검토에서 충진제(SiO2)의 입자는 에폭시 매트릭스와 견고하게 결합되어 있으며 충진제 첨가효과는 전반적으로 유전완화세기에는 별 영향을 미치지 못하나 계면분극효과에 의한 유전율을 증가시키는 효과가 있다.

• 한국신재생에너지학회:학술대회논문집
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• 2011.11a
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• pp.176.1-176.1
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• 2011

세계적으로 석유 기반 자원의 고갈에 따른 부족, 기후변화협약 및 환경규제 강화에 의해 세계적으로 바이오소재를 이용하고자 하는 연구와 더불어 유리강화복합재료의 대체물질로 적합한 천연섬유를 보강재로 사용하는 바이오복합재료의 연구 또한 활발하게 진행되고 있다. 최근 새로운 신재생에너지원으로 각광 받고 있는 바이오에너지 중 해조류는 가장 자연친화적이고 생산력이 뛰어난 바이오매스로 알려져 있다. 해조류는 바닷물 속에 녹아 있는 탄소를 흡수할 뿐만 아니라 광합성을 통해서도 탄소를 흡수하면서 성장하기 때문에 탄소흡수원의 역할을 하게 되며, 해조류 바이오에너지를 생산할 경우 화석연료를 대체하여 지구온난화의 주범인 온실가스를 감축하는 기능을 한다. 본 연구에서는 해조류를 이용한 바이오에너지 생산 공정에서 2차적으로 발생하는 부산물을 보강재로 사용한 바이오복합재료의 제조와 제조된 바이오복합재료의 열적 특성 및 동역학적 특성을 분석하였다. 해조류 부산물의 화학적 전처리에 따른 Thermogravimetric analysis(TGA) 분석 결과로 cellulose 함량이 가장 높고 불순물이 적은 황산 처리한 파래를 이용해 파래/Polypropylene(PP) 바이오복합재료를 다양한 보강비율 (20-50wt%)로 압축성형 하였다. 파래/PP 바이오복합재료의 저장탄성률은 파래 함량이 40wt%일 때 4.0 Gpa으로 최대값을 보였으며 이는 PP 매트릭스와 비교했을 때 약 8.1% 향상된 결과이다. 파래/PP 바이오보합재료의 열팽창 특성은 파래 함량이 증가함에 따라 열팽창계수가 낮아지는 경향으로 50wt%일 때 가장 낮은 값을 나타내었으며 이는 PP 매트릭스와 비교했을 때 약 56% 향상된 결과이다. 따라서 비생분해성 고분자에 새로운 신재생 바이오매스인 해조류를 보강재로 사용하여 열적 특성 및 동역학적 특성이 향상된 친환경적인 바이오복합재료의 제조 가능성을 확인하였다.

• Polymer(Korea)
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• v.31 no.5
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• pp.404-409
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• 2007

Polyurethane nanocomposites with inorganic nano fillers for the improvement thermal stability were prepared by the urethane reaction. Fire retardation properties of polyurethane nanocomposites were investigated by cone calorimeter and limited oxygen index (LOI). Maximum heat release rate of MMT-PU and $Bi_2O_3-PU$ polyurethane nanocomposites were decreased as 50% than polyurethane matrix and fire retardation properties of $MMT/Bi_2O_3-PU$ nanocomposte had the best improvement. The LOI of polyurethane nanocomposites also were improved as filling fillers in the nanocomposites over 20. The maximum heat release rates of MMT-PU, $Bi_2O_3-PU\;and\;MMT/Bi_2O_3-PU$ polyurethane nanocomposites were 764, 707, $635kW/m^2$, respectively and $MMT/Bi_2O_3-PU$ polyurethane nanocomposite exhibited the highest value of fire-retardant. We confirmed that polyurethane nanocomposites improved the fire retardation properties.

• Transactions of the Korean Society of Mechanical Engineers
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• v.17 no.5
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• pp.1106-1114
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• 1993

A composite material is composed of a reinforcement and a matrix, which determine mechanical characteristics of the molded part. There is no doubt that the properties of a composite material depend not only on the characteristics of the matrix but also on the structure of glass fiber mat and a fiber type of reinforcement. Therefore it is very important to study the composites of reinforcement and the matrix, and to control the fiber type in the process of molding of composite materials. In this study, the specimen was made of a glass fiber mat of 6-7mm thickness by scattering it in the air after cutting the glass fiber mat with needle punching makes change according to the type of needle and the number of times of stretching. First the sheet was made by means of a hot-press after accumulating a matrix and a glass fiber according to each mat structure of glass fiber. It was heated the manufactured sheet with the dry oven and molded it a secondary high temperature compression by a 30 ton oilhydraulic press. A definition of a correlation coefficient is showed up during this period and find it out with the relation of the fiber-matrix separation and the fiber orientation. We studied effects of the glass fiber mat structures on the correlation coefficient.

• Journal of Adhesion and Interface
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• v.15 no.4
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• pp.169-173
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• 2014

The effect of filler sizes on the thermal diffusivity of Nylon 66/SiC composites was investigated. By loading 60 vol% of SiC fillers on Nylon 66, the thermal diffusivity of the composites increased more than 10 times than that of unfilled Nylon 66 and the thermal diffusivity of composites with filler sizes of $24{\mu}m$ and $76{\mu}m$ increased to $2.2{\times}10^{-2}cm^2/sec$ and $1.75{\times}10^{-2}cm^2/sec$, respectively. It is speculated that the smaller filler size ($24{\mu}m$) of SiC is more favorable for the formation of thermal conductive path that the larger size ($76{\mu}m$) of filler composites. The thermal diffusivity of Nylon 46/SiC 400 (60 vol%) composites was $1.61{\times}10^{-2}cm^2/sec$ that was lower than that of Nylon 66/SiC (60 vol%) composites.