• Title/Summary/Keyword: PHR

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The Effect of the Shape of the Precured CIIR on the Physical Properties of the BR/CIIR Composites

  • Pyo, Kyeongdeok;Park, Chacheol
    • Elastomers and Composites
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    • v.50 no.4
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    • pp.258-264
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    • 2015
  • Rubber composites were prepared by precured CIIR pulverized at knead shear force in order to research the effects of the BR/PCP composites. The particle size of domain in BR/CIIR composites was decreased and homogeneously dispersed by the precured CIIR pulverized. However, it was difficult to use the product when the content is 40 phr and precured of 40%. BR/PCP composites have improved mechanical properies as compared that of the addition of simply cut chip composite.

Thermal and Mechanical Properties fo DGEBA/MDA/HQ-PGE System (DGEBA/MDA/HQ-PGE계의 열적, 기계적 성질)

  • Song, Yeong-Uk;Sim, Mi-Ja;Kim, Sang-Uk
    • Korean Journal of Materials Research
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    • v.7 no.5
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    • pp.386-389
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    • 1997
  • 반응성 첨가제로 사용된 HQ-PGE가 DGEBA/MDA계의 기계적 성질에 미치는 영향을 살펴보기 위해서 충격강도와 인장강도를 측정하였다. HQ-PGE의 함량이 25phr일 때 충격 강도는 첨가되지 않았을 때보다 40% 증가하고, 인장강도도 약간 증가하였다. 이것은 HQ-PGE가 합성될 때 생성된 수산기가 자촉매 반응을 하면서 에폭시 수지의 미반응된 에폭시기와 반응한 결과로 사료된다. Young's modulus와 신장율은 HQ-PGE의 함량이 증가함에 따라 크게 변화하지 않았다.

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Design of Personal Health Information Management System Based on Bigdata (빅데이터 기반의 개인 의료정보 관리 시스템 설계)

  • Yun, Sung-Yeol;Park, Seok-Cheon
    • Proceedings of the Korea Information Processing Society Conference
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    • 2012.04a
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    • pp.983-985
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    • 2012
  • 빅데이터의 다양한 활용 부문 중 의료정보 관리의 경우 향후 개인 건강관리의 중요한 정보로 사용될 수 있다. 이를 구체화 시키고 실생활에 적용시키기 위해 본 논문에서는 빅데이터 기반의 개인 의료정보 관리 시스템을 설계하였다. 이를 위하여 관련연구로 빅데이터와 PHR에 대해 분석하고, 빅데이터 기반의 개인 의료정보 관리 시스템을 설계하며, 외부와 의료정보 관리 시스템간의 의료정보 교환 프로토콜을 설계하였다.

Ox-Red Cell Membrane 抗原의 免疫 反應 硏究: I. 抗原成分의 分析實驗

  • 한국동물학회
    • The Korean Journal of Zoology
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    • v.15 no.2
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    • pp.92-93
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    • 1972
  • Ox-RBC로부터 Moddy法에 依하여 Ox-RCM抗原을 抽出하여 몇가지 分析을 實施하였다. Lyophilized 한 Ox-RCM protein의 化學的 分析 結果 total protein은 $55\\pm 1.3%$, total nitrogen은 9.2%, carbohydrate 8.5% 그리고 total acid soluble phosphorus는 $0.96\\pm 0.1%$였다. Polyacrylamide gel electrophoresis한 結果 Ox-RCM은 12 $\\sim$ 15個, Pre-VRS fraction은 8個 및 PHR 分劃은 9個의 pattern을 나타냈다. Amino acid의 分析 結果로 cystine이 4.93 $\\sim$ 3.72 moles/100 moles 이고 glycine이 最高로 26.7 $\\sim$ 13.5 moles/100 moles였고 最低로 methionine 이었으나 試料의 抽出方法에 따라 그 値의 變動을 볼 수 있다.

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Physical Properties and Foaming Characteristics of Poly(butylene adipate-co-succi nate)/Thermoplastic Starch Blends (Poly(butylene adipate-co-succinate)/Thermoplastic Starch 블렌드의 물성과 발포특성)

  • Kim, Sang-Woo;Park, Joon-Hyun;Kim, Dae-Jin;Lim, Hak-Sang;Seo, Kwan-Ho
    • Polymer(Korea)
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    • v.29 no.6
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    • pp.557-564
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    • 2005
  • Thermoplastic starch (TPS) was manufactured and blended with poly(butylene adipate-co-succinate) (PBAS), which is one of the most popular biodegradable aliphatic polyesters. The effects of the TPS contents on the mechanical properties, thermal characteristics, and biodegradability of PBAS/TPS blends were investigated. The foaming characteristics of those were also studied. With small amount of TPS, mechanical properties of the blends were largely deteriorated and the variations of them decreased with more addition of TPS. In addition, TPS decreased crystallinity and thermal decomposition temperature of PBAS. The PBAS/TPS foam having maximum blowing ratio was obtained with 20 Phr of TPS, and their blowing ratio decreased with the further increase of TPS.

SBR/Organoclay Nanocomposites for the Application on Tire Tread Compounds

  • Kim, Wook-Soo;Lee, Dong-Hyun;Kim, Il-Jin;Son, Min-Jin;Kim, Won-Ho;Cho, Seong-Gyu
    • Macromolecular Research
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    • v.17 no.10
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    • pp.776-784
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    • 2009
  • N,N-dimethyldodecylamine (tertiary amine)-modified MMT (DDA-MMT) was prepared as an organically modified layered silicate (OLS), after which styrene-butadiene rubber (SBR) nanocomposites reinforced with the OLS were manufactured via the latex method. The layer distance of the OLS and the morphology of the nanocomposites were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). By increasing the amount of N,N-dimethyldodecylamine (DDA) up to 2.5 g, the maximum values of torque, tensile strength and wear resistance of the SBR nanocomposites were increased due to the increased dispersion of the silicate layers in the rubber matrix and the increased crosslinking of the SBR nanocomposites by DDA itself. When SBR nanocomposites were manufactured by using the ternary filler system (carbon black/silica/OLS) to improve their dynamic properties as a tire tread compound, the tan $\delta$(at $0^{\circ}C$ and $60^{\circ}C$) property of the compounds was improved by using metal stearates instead of stearic acid. The mechanical properties and wear resistance were increased by direct substitution of calcium stearate for stearic acid because the filler-rubber interaction was increased by the strong ionic effect between the calcium cation and silicates with anionic surface. However, as the amount of calcium stearate was further increased above 0.5 phr, the mechanical properties and wear resistance were degraded due to the lubrication effect of the excessive amount of calcium stearate. Consequently, the SBR/organoclay nanocomposites that used carbon black, silica, and organoclay as their ternary filler system showed excellent dynamic properties, mechanical properties and wear resistance as a tire tread compound for passenger cars when 0.5 phr of calcium stearate was substituted for the conventionally used stearic acid.

Development of Vibraction and Impact Noise Dampling Wood-based Composites(I) -Dynamic Mechanical and Vibration Damping Properties of Plasticized PVC- (진동.충격음 흡수성능을 지니는 목질계 복합재료의 개발(I) -가소화 폴리염화비닐의 동적점탄성과 진동흡수성능-)

  • 이현종
    • Journal of Korea Foresty Energy
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    • v.17 no.1
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    • pp.36-46
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    • 1998
  • The aim of this study was to develop the noise and vibration damping wood-based composites by using viscoelastic polymer materials. Polyvinylchloride(PVC) was plasticized with 20-140 phr bis(2-ethylhexyl) phthalate(DOP) and the dynamic tensile mechanical properties were measured at 110Hz and approximate temperature range -100 to 150$^{\circ}$ using a Rheovibron Instrument. The PVC/DOP blends were shown to be compatible in all proportions, and both T(E”$_{max}$) and T(tan${\delta}_{max}$) shifted to the lower temperature side as the DOP content increased. The vibration damping properties of wood/polymer composites were measured using the Rheovibron instrument in a bending mode. The composite damping factor(tan ${\delta}_{c}$) of wood /PVC-DOP/wood sandwich structure correlated with the loss factor and that of the coated structure correlated with the loss modulus(E”) of the polymer layer. In addition, the sandwich structure was found to be more effective in damping than the coated structure. The logarithmic decrement (${\Delta}$c) curve of a sandwich structure, which was determined by the free-free flexural vibration method was similar in shape to the tan ${\delta}_{c}$ curve.

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Mining based Mental Health and Blood Pressure Management Service for Smart Health (스마트 헬스를 위한 마이닝 기반의 정신 건강과 혈압 관리 서비스)

  • Jung, Eun-Jin;Kim, Joo-Chang;Jung, Hoill;Yoo, Hyun;Chung, Kyungyong
    • Journal of the Korea Convergence Society
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    • v.8 no.1
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    • pp.13-18
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    • 2017
  • As the convergence technology is developing rapidly and the portable mobile devices are spreading in ubiquitous smart healthcare, users were able to get medical information easily through the smart health platform. According to such rapid industrialization, wellness care, aging society, information society, changes in disease aspects and life style, user-centered healthcare, and health promotion contents are being offered. In this study, we proposed the mining based mental health and blood pressure management service for the smart health. The proposed method provides the mental health management service and the blood pressure management service for chronic disease patients within the mining based smart health platform. Users receive optimized healthcare services regardless of time and place in the PHR based smart health platform. For the performance evaluation of the proposed mining based mental health and blood pressure management service, F-measure verification are conducted.

A Study on Thermal and Mechanical Interfacial Properties of Difunctional Epoxy/PMMA Blends (이관능성 에폭시/폴리메틸메타크릴레이트 블랜드의 열적 및 기계적 계면 특성)

  • 박수진;김기석;이재락;민병각;김영근
    • Composites Research
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    • v.17 no.1
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    • pp.10-17
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    • 2004
  • In this work, the blend system prepared from epoky(DGEBA)/polymethylmethacrylate(PMMA) was investigated in thermal and mechanical interfacial property measurements. The thermal properties were carried out by DSC, DMA, and TGA measurements. Also, the surface free energy and fracture toughness were determined by contact angle and critical stress intensity factor($K_{IC}$), respectively. And the fracture surface was observed by SEM after $K_{IC}$ tests. As experimental results, the curing temperature and glass transition temperature were slightly increased in addition of PMMA. Surface free energy of the blends showed an improved value at low contents of PMMA which could be attributed to the both increasings of London dispersive and polar components. From measurement of $K_{IC}$ of the blends, the highest value was found at 5 phr. This was due to the increasing of compatibility or physical interaction in macromolecular chains between DGEBA and PMMA of the blends.

Electrical and Mechanical Properties of Epoxy/Micro-sized Alumina Composite and the Effect of Nano-sized Alumina on Those Properties

  • Park, Jae-Jun;Shin, Seong-Sik;Yoon, Chan-Young;Lee, Jae-Young;Park, Joo-Eon
    • Transactions on Electrical and Electronic Materials
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    • v.16 no.5
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    • pp.260-263
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    • 2015
  • Epoxy/micro-sized alumina composite was prepared and the effects of alumina content on the electrical and mechanical properties were investigated in order to develop an insulation material for gas insulated switchgear (GIS). Nano-sized alumina (average particle size: 30 μm) was also incorporated into the epoxy/micro-sized alumina composite. An electrical insulation breakdown strength test was carried out in sphere-sphere electrodes and the data were estimated by Weibull statistical analysis. Tensile strength was measured at a crosshead speed of 10 mm/min using a universal testing machine. Alumina content was varied from 0 wt% to 70 wt%.). As micro-sized alumina content increased, insulation breakdown strength increased until 40 wt% alumina content and decreased after that content. The tensile strength of a neat epoxy system was 82.2 MPa and that value for 60 wt% alumina content was 91.8 MPa, which was 111.7% higher than inthe neat epoxy system. The insulation breakdown strength of micro-sized alumina (60 wt%)/nano-sized alumina (1 phr) glycerol diglycidyl ether (GDE) (1 phr) composite was 54.2 MPa, which was 116% higher than the strength of the system without nano-sized alumina.