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김현준,허지성,김건지,백다원,김상현 대한상하수도학회 2017 상하수도학회지 Vol.31 No.1
Surge pressure is created by rapid change of flow rate due to operation of hydraulic component or accident of pipeline. Proper control of surge pressure in distribution system is important because it can damage pipeline and may have the potential to degrade water quality by pipe leakage due to surge pressure. Surge relief valve(SRV) is one of the most widely used devices and it is important to determine proper parameters for SRV’s installation and operation. In this research, determining optimum parameters affecting performance of the SRV were investigated. We proposed the methodology for finding combination of parameters for best performance of the SRV. Therefore, the objective function for evaluate fitness of candidate parameters and surge pressure simulation software was developed to validate proposed parameters for SRV. The developed software was integrated into genetic algorithm(GA) to find best combination of parameters.
Preparation of PEDOT/PSSA Conductive Nanoparticles for Dielectrophoretic Display
강훈석,박수연,김건지,김정운,정헌,이승희,이명훈 한국고분자학회 2013 Macromolecular Research Vol.21 No.6
Poly(3,4-ethylenedioxythiophene) (PEDOT):poly(styrene sulfonic acid) (PSSA) nanoparticles for dielectrophoretic display were prepared by in situ polymerization of 3,4-ethylenedioxythiophene in the PSSA nanoparticle,which was obtained from the sulfonation of polystyrene nanoparticles prepared by a conventional emulsion technique. The properties of the resulting nanoparticle were characterized by Fourier transform infrared spectrascopy (FTIR), thermogravimetric analysis (TGA), scanning electron microscopy (SEM) and the dynamic light scattering (DLS) technique. The particle was uniform in spherical shape with an average diameter of ca. 300~320 nm,and showed high thermal stability up to 340 oC. The electrical conductivity of the PEDOT:PSSA nanoparticle was measured to be as high as 0.11 S/cm. The dielectrophoretic display cell prepared from the colloidal PEDOT:PSSA nanoparticle dispersed in nematic liquid crystal showed significant optical change in response to electric field variation.
주성민 ( Seong Min Ju ),이강학 ( Kang Hak Lee ),박수연 ( Soo Yeon Park ),김건지 ( Kun Ji Kim ),이명훈 ( Myong Hoon Lee ) 한국화상학회 2009 한국화상학회지 Vol.15 No.4
UV 경화형 수지를 바인더로 활용하고 다양한 크기, 형태, 재질의 입자를 첨가하여 분산시킨 분산액을 TAC(triacetylcellulose) 필름에 코팅한 후 경화시켜 난반사필름을 제조 하는데 이때 투입된 입자들이 필름의 물성에 미치는 영향을 분석하였다. 그 결과 입자의 형태가 구형 일 때 표면요철 형성에 유리하며 크기가 작은 입자보다는 큰 입자를 사용할 때 표면요철 형성이 용이하다는 것을 확인할 수 있었다. 입자의 재질이 표면요철에 미치는 영향은 입자의 크기나 형태에 의한 영향보다는 상대적으로 작았다. 입자와 바인더 수지는 각각 굴절율이 다르며 이에 따라서 바인더수지와 입자의 굴절율 차가 달라지게 된다. 따라서 입자의 재질에 따라 PS(polystyrene), silica, PMMA(poly(methyl methacrylate)) 순서로 total haze 변화율에 영향을 미치는 것을 확인할 수 있었다. Antiglare films for display devices are currently prepared by coating a photocurable resin solution containing particles of various sizes, shapes, and materials in UV crosslinkable binder. The effect of particles on the properties of antiglare film was investigated. Spherical particles having larger diameter resulted in effective surface roughness. Type of materials affected the surface roughness relatively less compared to the size or shape. However, it was found that the total haze and clarity of the film were significantly affected by their refractive index difference between the binder resin and particles. The magnitude of these effects increased in the order of PMMA < silica < PS which is in agreement with that of refractive index differences.