• Title/Summary/Keyword: PHR

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A Study on Application of Internet-based Personal Health Record(PHR) System: Using Google Health (인터넷기반의 개인전자건강기록 시스템 적용사례 연구: 구글헬스를 중심으로)

  • Jeong, Seong-Hee
    • Journal of Digital Contents Society
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    • v.10 no.3
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    • pp.433-439
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    • 2009
  • With the help of fast growing popularization of internet, all areas of e-Health have expanded rapidly; such that people have become interested in digital personal health record and its management. This paper examined the characteristics of personal health record and made the analysis of the structure of Google Health, the internet-based personal health record system. Google Health allows you to store and manage all of your health information, import medical records from hospitals and pharmacies, share your health records, and explore online health services. This examples represents not only a significant change of current medical systems but also enables to estimate the future stream of it. As a result, this paper, in the areas of e-Health which will be expanded in various service areas, may give you a greater sense of importance of personal health record and will eventually provide more complemental structure of future personal health record through comparative studies on the strength and weakness of it.

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Effects of Coupling Agents and Clay on the Physical Properties of Wood Flour/Polyethylene Composites (커플링제 및 점토가 목분/폴리에틸렌 복합체의 물성에 미치는 영향)

  • Park, Byung-Sub;Kim, Dae-Su
    • Polymer(Korea)
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    • v.35 no.2
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    • pp.124-129
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    • 2011
  • Wood plastic composites (WPCs) are attracting a lot of interest recently. In this study, wood flour/polyethylene (PE) composites panels comprised of a coupling agent and nanoclay were prepared by melt-blending followed by compression molding. Five maleic anhydride grafted polyethylene (MAPE) coupling agents were tested, and the best choice and its optimum content were determined. The mechanical properties of the WPCs were measured by UTM, and the thermal properties were measured by TGA, DMA, DSC, and TMA. Adding just a small amount (1 phr) of organoclay made the tensile and flexural strength and the crystallinity of the WPC somewhat increase and the storage modulus and dimensional stability of the WPC largely increase. SEM images showed that the coupling agent drastically improved wood flour/PE interfacial bonding. Selecting the best coupling agent optimized content and adding a small amount of organoclay resulted in a high performance wood flour/PE composite.

Measurement of Thermal Shrinkage/Expansion Force of Filled Rubber (충전된 고무재료의 열변화에 따른 수축력/팽창력 측정)

  • Park, Sang-Min;Hong, Chang-Kook;Cho, Dong-Lyun;Kaang, Shin-Young
    • Elastomers and Composites
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    • v.42 no.4
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    • pp.201-208
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    • 2007
  • In this study, the thermal shrinkage and expansion stresses of filled NR and SBR vulcanizates were measured to investigate the dimensional stability at an elevated temperature. When a rubber sample was held at constant pre-strain, a thermal stress developed upon heating due to the entropic consideration. The peak shrinkage stress of carbon black or silica filled NR decreased with increasing filler content. In SBR compounds, however, the peak shrinkage stress of SBR with 30 phr filler content was higher than that of unfilled compounds. The expansion stress of carbon black filled NR was changed little, but that of filled SBR increased with increasing the filler content. The peak expansion stress of silica filled NR and SBR vulcanizates increased with increasing silica content.

Effect of Kenaf Fiber Loading on the Properties of Natural Fiber/Natural Rubber Composites (천연섬유/천연고무 복합재료의 특성에 미치는 Kenaf 섬유함량의 영향)

  • Cho, Yi-Seok;Cho, Dong-Hwan
    • Elastomers and Composites
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    • v.46 no.3
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    • pp.186-194
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    • 2011
  • Natural fiber/natural rubber composites were fabricated by uniformly compounding natural rubber and cellulose- based natural fiber kenaf and then by compression molding. The effect of kenaf fiber content on their vulcanization behavior, hardness, tensile properties, tear strength and static and dynamic properties was investigated. The contents of kenaf fiber in the composites were 0, 5, 10, 15, and 20 phr, compared to natural rubber and additives. The result indicated that various properties of natural rubber depended on the kenaf fiber content. With increasing kenaf fiber content, the torque for vulcanization of natural rubber was increased whereas the vulcanization time was reduced as well. The hardness, tensile modulus and tear strength of kenaf/natural rubber composites were gradually decreased with the fiber content whereas the tensile strength and elongation at break were decreased. Also, with increasing the kenaf fiber content the dynamic property of natural rubber was changed more greatly than the static property. The loss factor, which is closely related with the damping or absorption of the energy given to natural rubber, was proportionally increased with the fiber content.

Crock Resistance Properties of Natural Rubber Compounds for Tank Track Pads (군용 전투차량 궤도 pads용 천연고무 배합물의 내크랙성 향상을 위한 연구)

  • Shin, Jung-Eun;Kim, Yu-Seuk;Bae, Jong-Woo;Kim, Won-Ho
    • Elastomers and Composites
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    • v.33 no.5
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    • pp.335-344
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    • 1998
  • In this study, the tearing energy and the rate of crack propagation of natural rubber (NR) compounds were evaluated to improve the crack resistance of tank-track pads. Although the factors affecting the crack resistance properties of NR compounds are various in this experiment, the effects of filler(carbon black) and the crosslinking system were evaluated. When the amount of accelerator is equal to that of sulfur( eg. efficient vulcanization), the compound shows the most excellent in the aged mechanical properties and the crack resistance properties. The ISAF carbon black(CB) having a good reinforcing characteristics was better than any other CB grades in physical properties and processablity. The optimum content was 50phr.

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A Study of Self-Sealing Rubber Material Using Foamed Natural Rubber (NR 발포를 사용한 자기 밀폐형 고무 재료의 연구)

  • Kim, Do-Hyun;Kim, Hyun-Mook;Lee, Chang-Seop;Ahn, Won-Sool;Kim, Joon-Hyung
    • Elastomers and Composites
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    • v.41 no.2
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    • pp.88-96
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    • 2006
  • The self-sealing rubber material for a fuel cell which has self-sealing ability, in case of fuel leakage, was studied. Cure characteristics, density, swelling, and surface morphology of foamed natural rubber were investigated with carbon black and with processing oil within the range of $10{\sim}30phr$. The rheological properties indicated that the value of $ts_2$ and the value of $Tc_{90}$ were increased with increasing a content of processing oil, while carbon black did not show a similar trend. A difference in density by foaming was decreased to one fifth scale compared to the initial value. According to the swelling test of foamed natural rubber in fuel C, isooctane and toluene, all the self-sealing action was finished in two minutes. From the SEM image for the surface of rubber compounding, a foaming by sodium bicarbonate was found to be unequal and consecutive foaming cell.

Characterization of Modified Chloroprene Rubber by Nanosilica as a Primer (Modified Chloroprene Rubber를 이용한 Primer 제조 및 특성평가)

  • Lim, Gyeong Eun;Jeong, Boo Young;Cheon, Jung Mi;Choi, Min Ji;Chun, Jae Hwan
    • Journal of Adhesion and Interface
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    • v.19 no.1
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    • pp.1-4
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    • 2018
  • Water In this study, CR/silica nanocomposites were produced by dispersing nanosilica on chloroprene rubber (CR) to apply toluene-free primers for mobile devices. The properties of the modified chloroprene rubber using nanosilica was evaluated through FT-IR, SEM, EDS, Contact angle. The SEM images indicated that P-4 (4 phr) was the most homogenously dispersed. Pencil hardness measurements and Contact angle indicated that the hardness of the CR/silica nanocomposite and the hydrophobicity increased with increase in the silica content. The peel strength of P-4 (4phr) was the highest and the initial peel strength of P-4 sample (2.9 kgf/inch) was 50% higher than that of the P-0 sample.

Cure Behaviors and Mechanical Interfacial Properties of Epoxy/Polyurethane Blends Initiated by Latent Thermal Catalyst (열잠재성 개시제에 의한 에폭시/폴리우레탄 블렌드의 경화거동 및 파괴인성)

  • Park, Soo-Jin;Seok, Su-Ja;Kang, Jun-Gil;Kwon, Soo-Han
    • Elastomers and Composites
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    • v.39 no.1
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    • pp.42-50
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    • 2004
  • In this work, the diglycidylether of bisphenol A (DGEBA) and modified polyurethane (PU) blends were initiated by N-benzylpyrazinium hexafluoroantimonate (BPH). The cure and fracture toughness of neat DGEBA with the addition of PU were investigated. The cure properties of DGEBA/PU blend system were examined by DSC and near-IR measurements. The fracture touhtness were investigated by measuring the critical stress intensity factor ($K_{IC}$) and the critical strain energy release rate ($G_{IC}$). According to the results, the maximum values of owe activation energy ($E_a$) and conversion (${\alpha}$) were found at 10 phr of PU. Also the $K_{IC}$ showed a similar behavior with the results of conversion. These results were probably due to increase of crosslinking density in the blends resulted from increase of the hydrogen bonding between the hydroxyl groups of DGEBA and isocyanate groups of PU.

Preparation & Properties of the Flame Retarded NBR Foams with Phosphorus/Nitrogen-Containing Flame Retardants (인/질소계 난연제를 포함한 난연 NBR 발포체의 제조 및 특성)

  • Jo, Byung-Wook;Moon, Sung-Chul;Choi, Jae-Kon
    • Elastomers and Composites
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    • v.39 no.2
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    • pp.105-120
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    • 2004
  • The flame retarded NBR foams were prepared with metal hydroxides and various phosphorus/nitrogen-contain ing flame retardants. The dependency of the phosphorus content on thermal properties, flame retardancy, smoke density, and foaming properties were investigated in the foams. Foaming properties and morphology of the flame retarded NBR foams with P/N flame retardants( ${\le}10 phr$) were similar to those of the foams without P/N ones but containing metal hydroxides The flame retardancy of the foams was improved with increasing the phosphorus content and char formation under combustion atmosphere. The cone-calorimeter test and LOI index were also coincided with the TGA analysis quite well. The heat release rate (HRR), total heat release (THR), and effective heat of combustion (EHC) were decreased, whereas the carbon monoxide yield was increased with increase of the phosphorus content of P/N flame retardant. The smoke density values were closely related with CO yield values obtained by the cone-calorimeter test due to the high and hard char formation.

Mechanical Properties of Organoclay filled NR/BR Blends (Organoclay로 보강된 NR/BR Blends의 기계적 특성)

  • Kim, W.;Kim, S.K.;Kim, S.K.;Chuug, K.H.;Byun, J.Y.
    • Elastomers and Composites
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    • v.39 no.1
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    • pp.51-60
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    • 2004
  • The cure, viscoelastic and mechanical characteristics of organoclay filled NR/BR blends were studied and compared with the properties of carbon black and silica filled NR/BR blends. The nanocomposites with extensive exfoliation state can be fabricated by a solution mixing method. In the composites, the amount of filler content was fixed to 10 phr. Degree of intercalation and exfoliation was characterized by X-ray diffraction (XRD). XRD results indicated exfoliation of the silicate layers into the rubber matrix. While the degree or intercalation and exfoliation is lowered by the conventional mixing method, extensive exfoliation can be obtained by the solution mixing method. It was found that the clay filled NR/BR compound showed better viscoelastic (tan ${\delta}$) and mechanical properties than the carbon black or silica filled NR/BR compounds.