• Title/Summary/Keyword: PHR

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An Efficient Multi-Layer Encryption Framework with Authentication for EHR in Mobile Crowd Computing

  • kumar, Rethina;Ganapathy, Gopinath;Kang, GeonUk
    • International journal of advanced smart convergence
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    • v.8 no.2
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    • pp.204-210
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    • 2019
  • Mobile Crowd Computing is one of the most efficient and effective way to collect the Electronic health records and they are very intelligent in processing them. Mobile Crowd Computing can handle, analyze and process the huge volumes of Electronic Health Records (EHR) from the high-performance Cloud Environment. Electronic Health Records are very sensitive, so they need to be secured, authenticated and processed efficiently. However, security, privacy and authentication of Electronic health records(EHR) and Patient health records(PHR) in the Mobile Crowd Computing Environment have become a critical issue that restricts many healthcare services from using Crowd Computing services .Our proposed Efficient Multi-layer Encryption Framework(MLEF) applies a set of multiple security Algorithms to provide access control over integrity, confidentiality, privacy and authentication with cost efficient to the Electronic health records(HER)and Patient health records(PHR). Our system provides the efficient way to create an environment that is capable of capturing, storing, searching, sharing, analyzing and authenticating electronic healthcare records efficiently to provide right intervention to the right patient at the right time in the Mobile Crowd Computing Environment.

A Synthesis of UV Hard Coating Solution for Plastic Display Plate Using Poly(Urethane Acrylate) Siloxane Oligomer (Poly(Urethane Acrylate) Siloxane Oligomer를 이용한 플라스틱 디스플레이 기판용 UV 하드코팅 용액의 합성)

  • Back, Sung Kyun;Jang, Sun Ho;Yoo, Seong Sik;Cho, Ur Ryong
    • Journal of the Semiconductor & Display Technology
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    • v.16 no.3
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    • pp.87-92
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    • 2017
  • Poly(urethane acrylate) siloxane oligomers with Interpenetrating polymer networked nanoparticles were prepared to synthesize hard coating solution by reaction with isophorone diisocyanate(IPDI) of 1, 2, 3, 4 phr. The structures and molecular weights of the synthesized solutions were characterized by IR spectroscopy and gel permeation chromatography, respectively. In the cross-cut test for the adhesion, all the solutions showed good adhesion of 5B regardless of the content of IPDI and film thickness. The addition of 1 phr IPDI resulted in the best pencil hardness. The IPDI combined siloxane hard coating solution showed more flexibility than the siloxane solution. These results will yield the improvement in the siloxane solution using for plastic display plate.

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Preparation and Characterization of Modified Natural Rubber Applied to Seismic Isolation Damper Rubber

  • Seong-Guk Bae;Woong Kim;Yu mi Yun;Jin Hyok Lee;Jung-Soo Kim
    • Elastomers and Composites
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    • v.58 no.3
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    • pp.128-135
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    • 2023
  • To improve the adhesive strength of natural rubber (NR) for a seismic isolation damper, citraconic acid-g-NR (CCA-g-NR) was synthesized via the melt grafting of citraconic acid (CCA) onto NR using an azobisisnomerobutyronitrile (AIBN) initiator. Subsequently, the influence of CCA and AIBN concentrations on the graft ratio G/R (%) and graft efficiency G/E (%) of the CCA-g-NR was investigated. The optimum CCA and AIBN concentrations required to achieve the desired G/R (3.49%) and G/E (49.8%) were found to be 7 phr and 0.13 phr, respectively. Additionally, we studied the influence of CCA-g-NR concentration on the mechanical properties (tensile strength, elongation at break, and modulus at 300%), adhesive strength, and cure characteristics of the rubber compound in the seismic isolation damper. As the concentration of CCA-g-NR increased, the elongation at break and adhesive strength of the compound increased, whereas its tensile strength and modulus at 300% decreased. Moreover, as the concentration increased, the maximum torque decreased and the scorch time was delayed to obtain an optimal vulcanization time.

Effect of Blowing Agents on Physical Properties of Polyurethane-polydimethylsiloxane Hybrid Foam

  • Asell Kim;Hyeonwoo Jeong;Sang Eun Shim
    • Elastomers and Composites
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    • v.58 no.4
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    • pp.208-215
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    • 2023
  • In this study, the properties of polyurethane-polydimethylsiloxane (PU-PDMS) hybrid foams containing different types and contents of physical blowing agents (PBAs) were investigated. Two types of blowing agents, namely physical blowing agents and thermally expandable microspheres (TEM), were applied. The apparent density was measured using precisely cut foam samples, and the pore size was measured using image software. In addition, the microstructure of the foam was confirmed via scanning electron microscopy and transmission electron microscopy. The thermal conductivities related to the microstructures of the different foams were compared. When 0.5 phr of the hydrocarbon-based PBA was added, the apparent density and pore size of the foam were minimal; however, the pore size was larger than that of neat foam. In contrast, the addition of 3 phr of TEM effectively reduced both the apparent density and pore size of the PBAs. The increase in resin viscosity owing to TEM could enhance bubble production stability, leading to the formation of more uniform and smaller pores. These results indicate that TEM is a highly efficient PBA that can be employed to decrease the weight and pore size of PU-PDMS hybrid foams.

Effect of 3-Amino-1,2,4-triazole on Microstructure and Properties of Maleated HDPE/Maleated EPDM Blend (3-Amino-1,2,4-triazole이 Maleated HDPE/Maleated EPDM 블렌드의 미세구조 및 물성에 미치는 영향)

  • Kim, Tae Hyun;Chang, Young-Wook;Lee, Yong Woo;Kim, Dong Hyun
    • Elastomers and Composites
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    • v.49 no.1
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    • pp.24-30
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    • 2014
  • 3-Amino-1,2,4-triazole (ATA) (2.5 and 5.0 phr) was incorporated into a immiscible maleated ethylene propylene diene rubber(mEPDM)/maleated high density polyethylene(mHDPE) (50 wt%/50 wt%) blend by melt mixing. Effects of the ATA on structure, mechanical and rheological properties of the blend was investigated. FT-IR and DMA results revealed that supramolecular hydrogen bonding interactions between the polymer chains occur by reaction of ATA with maleic anhydride grafted onto the component polymers in the blend, which induces the physical crosslinks in the blend. FE-SEM analysis showed that mEPDM forms a dispersed phase in continuous mHDPE matrix, and the blend with the ATA has finer phase morphology as compared to the blend without the ATA. By the addition of ATA in the blend, there were significant increases in tensile strength, modulus and elongation-at-break as well as elastic recoverability. Melt rheology studies revealed that ATA induced substantial increase in storage modulus and complex viscosity of the blend at the melt state.

Modification of Silica Nanoparticles with Bis[3-(triethoxysilylpropyl)]tetrasulfide and Their Application for SBR Nanocomposite (Bis[3-(triethoxysilylpropyl)]tetrasulfide에 의한 실리카 입자의 표면개질 반응과 SBR 나노 복합체 응용)

  • Ryu, Hyun Soo;Lee, Young Seok;Lee, Jong Cheol;Ha, KiRyong
    • Polymer(Korea)
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    • v.37 no.3
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    • pp.308-315
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    • 2013
  • In this study, we performed surface modification of silica nanoparticles with bis[3-(triethoxysilylpropyl)]tetrasulfide (TESPT) silane coupling agent to study the effects of treatment temperature, treatment time, and amount of TESPT used on the silanization degree with Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), elemental analysis (EA) and solid state $^{13}C$ and $^{29}Si$ cross-polarization magic angle spinning (CP/MAS) nuclear magnetic resonance spectroscopy (NMR). We found peak area of isolated silanol groups at $3747cm^{-1}$ decreased, but peak area of $-CH_2$ asymmetric stretching of TESPT at $2938cm^{-1}$ increased with the amount of TESPT from FTIR measurements. We also used universal testing machine (UTM) to study mechanical properties of styrene butadiene rubber (SBR) nanocomposites with 20 phr (parts per hundred of rubber) of pristine and TESPT modified silicas, respectively. The tensile strength and 100% modulus of modified silica/SBR nanocomposite were enhanced from 5.65 to 9.38MPa, from 1.62 to 2.73 MPa, respectively, compared to those of pristine silica/SBR nanocomposite.

Effect of Nanocellulose and Aminated Starch on Tensile and Thermal Properties of Plasticized Starch Film (가소화 전분필름의 강도 및 열적 성질에 미치는 나노셀룰로오스 및 아민화전분의 첨가영향)

  • Kim, Bo-Yeon;Han, Song-Yi;Lee, Sung-Yong;Kim, Young-Kyoon;Kim, Nam-Hun;Lee, Seung-Hwan
    • Journal of the Korean Wood Science and Technology
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    • v.42 no.4
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    • pp.376-384
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    • 2014
  • This study investigated the effect of nanocellulose, such as microfibrillated cellulose (MFC) and cellulose nanocrystal (CNC), and aminated starch on tensile property and thermal stability of plasticized starch film. Glycerol (23 wt%) was used as a plasticizer and nanocelluloses of 1-30 parts per hundred parts of resin (phr) in the basis of plasticized starch were added. Tensile strength and elastic modulus increased with increasing nanocellulose addition amount, whereas elongation at break decreased. Tensile properties of MFC-reinforced starch film were higher than those of CNC-reinforced film. Optimum addition amount of aminated starch, which is commonly used for paper sizing, to improve tensile property of film, was found to be 5%. And 1% addition of aminated starch showed the best effect in the improvement of tensile property of the film. Thermal stability was improved with the addition of MFC to plasticized starch film with and without aminated starch.

A Study on the Characteristics of IR/CR Rubber Blends by Surface Treatment with Chlorine (염소의 표면처리에 따른 IR 및 CR Blend의 특성 연구)

  • Park, Ji-Hye;Lee, Chang-Seop;Park, Hyun-Ho
    • Journal of the Korean Chemical Society
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    • v.54 no.6
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    • pp.749-754
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    • 2010
  • In this study, rubber vulcanization property, change in physical property, morphology and chemical characteristics of blended rubber depending on various IR/CR ratio were investigated for the purpose of the improvement of material property and durability. The effect of surface treatment by chlorine on the friction coefficient was also studied with various conditions of surface treatment. In terms of vulcanization property, as the amount of CR content increased, the speed of cure was decreased, while the density of crosslinking stayed constant. It means hardness and modulus were increased as the CR content increased. It is related to change in cure property and mechanical strength was improved by the effect of crystallization reaction. In the aging property, as the CR content increases, the changed amount of basic properties were decreased, which acts as a reducing factor in change of aged property by complementing weak point in mechanical property. It was found that the degree of property change for surface treated samples were reduced. According to the microscopic result, the degree of surface dispersion on rubber blends was increased by increasing CR content. Rubber surface showed uniform direction in pattern with increased smoothness and luster by treatment with chlorine. The degree of rubber reforming was measured by the remaining amount of chlorine and the friction coefficient was dependent on the amount of chlorine combined with rubber. In the initial stage of surface treatment, from 10 to 40 phr, the friction coefficient of specimen was rapidly reduced. However, as the concentration of chlorine solution increased, the change in friction coefficient was decreased.

Cure Behaviors and Fracture Toughness of PEl/Difunctional Epoxy Blends (PEI/DGEBA 블랜드계의 열적특성 및 파괴인성)

  • Park, Soo-Jin;Jin, Sung-Yeol;Kaang, Shinyoung
    • Journal of Adhesion and Interface
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    • v.4 no.3
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    • pp.33-40
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    • 2003
  • In this work, diglycidyl ether of bisphenol A (DGEBA)/polyetherimide (PEI) blends were cured using 4,4-diaminodiphenyl methane (DDM). And the effects of addition of different PEI contents to neat DGEBA were investigated in the thermal properties and fracture toughness of the blends. The contents of contents of containing PEI were varied in 0, 2.5, 5, 7.5, and 10 phr. The cure activation energies ($E_a$) of the cured specimens were determined by Kissinger equation and the mechanical interfacial properties of the specimens were performed by critical stress intensity factor ($K_{IC}$). Also their surfaces were examined by using a scanning electron microscope (SEM) and the surface energetics of blends was determined by contact angles. As a result, $E_a$ and $K_{IC}$ showed maximum values in the 7.5 phr PEI. This result was interpreted in the increment of the network structure of DGEBA/PEI blends. Also, the surface energetics of the DGEBA/PEI blends showed a similar behavior with the results of $K_{IC}$. This was probably due to the improving of specific or polor component of the surface free energy of DGEBA/PEI blends, resulting in increasing the hydrogen bonding of the hydroxyl and imide groups of the blends.

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A Study on Electrification Properties of Electrostatics in Silicone Rubber (실리콘 고무의 정전기 대전특성에 관한연구)

  • Lee, Sung-Ill;Kim, Hee-Dae
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2010.06a
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    • pp.107-107
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    • 2010
  • IT 산업의 발달과 더불어 카메라, 휴대폰, 노트북, 캠코더 등 전기전자 응용분야에 복합기능성 실리콘 고무 시트가 사용되고 있다. 본 연구에서는 실리콘 고무의 사용시 발생하는 정전기를 방지하기 위해 습도와 온도 변화에 따른 정전기 대전전압을 측정하였다. 카본양의 증가에 따라서 대전전압이 감소하였으며 습도가 증가됨에 따라 정전기 대전량은 감소하였다. 12Phr카본 첨가시 대전과 동시에 완화가 일어남을 확인했다.

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