• Journal of the Semiconductor & Display Technology
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• v.16 no.1
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• pp.52-58
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• 2017

Graphene oxide (GO)/carboxylated styrene-butadiene rubber (XSBR) nanocomposites with various contents of GO were prepared by a latex compounding method. It has been confirmed that the functional groups of GO and the hydrogen bonds between GO and XSBR are existed. It can be seen that the scorch time ($t_{s2}$), which is the measurement of incipient vulcanization of rubber, showed a delay after the addition of GO. Field emission scanning electron microscopy was employed to confirm the uniform dispersion of filler in the matrix. Indeed, with increasing fillers loading, the torque, tensile strength, thermal stability and crosslink density of obtained nanocomposites were improved. These results were correlated to the better dispersion of fillers through the rubber matrix.

• Journal of the Korean Institute of Telematics and Electronics B
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• v.28B no.10
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• pp.822-830
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• 1991

In this paper, we propose a new process for ultrasonic B-mode image considering the sound field effects of a concave circuit focused transducer, and aim to remove the speckle pattern which cause the blurring on boundary in ultrasonic B-mode image. We discuss in detail the conception of speckle pattern generation, and the frequency compounding method which is applied to the process for getting a speckle reduced B-mode image. Through the computer simulation, we define the meaning of speckle region, and show the results of reduced speckle pattern. It is discovered in the results that the frequency compounding method is very effective for boundary detection and that the application of the method is limited by various conditions.

• Proceedings of the KIPE Conference
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• 2016.11a
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• pp.159-160
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• 2016

본 논문에서는 최근 건설기계용으로 연구되고 있는 E-TCS의 Power Electronics System에 대한 Topology와 제어방법을 제안한다. 디젤엔진과 같이 사용되는 E-TCS는 압축기와 터빈 그리고 요구되는 회전속도로 고속회전 및 발전이 가능한 모터와 이를 제어하는 인버터로 구성된다. 기존의 E-TCS를 위한 Power Electronics System의 경우 배터리의 전압강압으로 인버터의 전류량이 증가하여 Power Electronics System 및 모터의 Volume이 커지는 단점이 있으며, 특허가 존재하여 사용이 어렵다. 본 논문에서는 이와 같은 단점을 개선한 E-TCS를 위한 새로운 Topology 구성 및 제어방식을 제안한다.

• YAKHAK HOEJI
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• v.54 no.4
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• pp.244-251
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• 2010

Standardized parenteral nutrition is required to improve patient's safety, clinical appropriateness and to increase uniformity between institution and institutions. We assessed the consistency with the American society for parenteral and enteral nutrition (A.S.P.E.N.) practice guideline for PN by evaluating current practice process for parenteral nutrition formulation in inpatients pharmacies in Korea. Each question in this survey was based on 2007 A.S.P.E.N. recommendations of standard parenteral nutrition formulation, the American society of health-system pharmacists (ASHP), and the United State Pharmacopoeia (USP) Chapter 797 guideline for compounding parenteral nutritions. All 90 Korean society of hospital pharmacist (KSHP) member directors of pharmacy were requested to respond to the survey in order to compare the survey results to ASHP national survey of pharmacy practice in hospital settings (2002) in compliance with A.S.P.E.N. guideline. We had final response rate of 35.6%. 25 (100%) hospitals complied with this Garb guideline (response rate was 84.4%) which was the highest compliance. Only 17.9% of hospital pharmacies were actively involved in complications monitoring. Monitoring complications and efficacy were least in compliance with the A.S.P.E.N. guideline. 69.0% of Korean pharmacists adjusted medication dosage based on disease state or monitoring laboratory data in compliance with the A.S.P.E.N. guideline. Over 50% of the hospital pharmacies failed to provide and evaluate staff training in aseptic manipulation skills periodically. Korean hospital pharmacies need to comply with the standard practice guideline for compounding sterile preparation in order to provide better quality of parenteral nutrition service for specific patient population.

• Polymer(Korea)
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• v.27 no.6
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• pp.576-582
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• 2003

When the halogenated flame retardant, decabromodiphenyl oxide, was added to the polypropylene/nylon blend, and was compounded with montmorillonite and compatibilizer, maleic anhydride polypropylene, the improvement of flame retardancy and mechanical properties was investigated. The degree of dispersion between polymer resin and inorganic nanoparticles was investigated, and the flame retardancy and mechanical properties was measured quantitatively. XRD results showed that the montrnorillonite was com-pletely exfoliated after polypropylen/nylon nanocomposites was mixed above twice. By compounding with montmorillonite, polypropylene/nylon blend system was overcome the deterioration of flame retardancy. The tensile strength and impact strength were slightly increased, and by compounding with montmorillonite, the additional increase in mechanical properties was obtained. Therefore, the flame retardancy of polypropylene / nylon blend was decreased by adding nylon, but by compounding with inorganic nanoparticle, improvement of the flame retardancy and mechanical properties was obtained.

• Elastomers and Composites
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• v.34 no.2
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• pp.113-120
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• 1999

Nobody doubts to say that one of the most important performance polymers is a conductive polymer. The manufacturing process of the commercial conductive polymers has been known by mixing with the conductive materials, but it doesn't noticeably appear of a conductive function. One of the reasons is the lack of comprehension In compounding a carbon black with polymer rosins. This paper involves the understanding of compounding technology of the conductive carbon black filled composite. Our experimental results indicate that the fibrous shaped carbon black was hard to process but appeared of a superior conductivity compared to a stick or a sphelulite shaped carbon black. Therefore, it was processed with a processing oil in compounding, which led to a better processability and a better conductivity. This study was accomplished that the solution process compared to the melting process.

• Proceedings of the Korean Society of Dyers and Finishers Conference
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• 2010.03a
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• pp.113-114
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• 2010

• The tire
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• s.6
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• pp.29-34
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• 1967

Low-structure black has proved to be a useful addition to the group of reinforcing fillers, allowing greater compounding flexibility and economy. Quite apart from the quality advantages, the volume used to date represents a considerable dollar saving by the rubber industry. Low-structure has also filled a need in a number of critical applications, and promises to become of increasing importance.

• The Korean Journal of Rheology
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• v.10 no.4
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• pp.247-255
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• 1998

The morphological changes during melt compounding of ternary blends containing various combinations of acrylonitrile-butadiene-styrene(ABS), methyl methacrylate-butadiene-ethyl acrylate(MBE), styrene-acrylonitrile(SAM) copolymers, and poly(methyl methacrylate)(PMMA) as dispersed components in a fixed matrix of polycarbonate(PC) have been investigated. Depending on the composition of the blend, MBE particles and PMMA phase appear to locate at the PC-SAN interface under the influence of interfacial tensions and motion induced coalescence. The interfacial viscosity is found to be a critical factor that affects the amount of coalescence.

• Macromolecular Research
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• v.14 no.2
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• pp.187-193
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• 2006

Organoclay, was applied as a filler, in place of carbon black and silica, to a natural rubber (NR)/butadiene rubber (BR) blend. A compounding method was used to disperse and separate the layered silicates. The effect of a coupling agent on the vulcanizates was evaluated using both the silica and organoclay filled compounds. After the compounding processes were completed, the XRD diffraction peaks disappeared, but then reappeared after vulcanization. The scorch times for the organoclay-filled compounds were very short compared to those for carbon black and silica-filled compounds. The organoclay-filled compounds showed high values of tensile strength, modulus, tear energy, and elongation at the break. When ranked by viscosity, the compounds appeared in the following order: silica > silica (Si-69) > organoclay > organoclay (Si-69) > carbon black. Fractional hysteresis, tensile set, and wear rates were very consistent with the viscosity of the vulcanizates. The Si 69 coupling agent increased reversion resistance, the maximum torque values in the ODR, modulus, and wear resistance, but decreased elongation at the break, fractional hysteresis, and tension set of the vulcanizates.