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Kim, Ohyoung,Kim, Yongwoon,Han, Sanghyuk,Youn, Myungsup 한국공업화학회 2003 응용화학 Vol.7 No.2
Polymeric dental restorative composites (PDRC) containing urethane dimethacrylate was prepared using the visible light activation system. The resin matrix system of PDRC was 2,2'-bis-[4-(3-methacryloxy-2-hydroxypropoxy)phenyl]propane diluted with triethyleneglcoldimethacrylate and/or urethane dimethacrylate(UDMA). The hybrid-filler system was used as an filler component. To improve the dispersibility of the filler in the PDRC, its surface was hydrophobically coupled with silane compound. In the present study, effect of UDMA diluent on the mechanical properties of the PDRC was investigated by measuring the diametral tensile strength, flexural strength, and flexural modulus values. Scanning electron microscopy study indicated the superior surface characteristics of PDRC product prepared herein.
김오영,한상혁,김용운,김원희,오명환 한국공업화학회 2003 응용화학 Vol.7 No.2
Effect of camphorquinone (CQ) photoinitiator on the dental properties of polymeric dental restorative composites (PDRC) was investigated. The surface of the barium silicate filler (avg. diameter 1μm) was treated with γ-methacryloxypropyl-trimethoxysilanc to improve the interfacial behavior between the resin matrix and filler. A visible light system was utilized to activate the resin matrix in PDRC and the contents of CQ were varied from 0.1 to 1.0 wt% based on 2.2'-bis-[4-(3-methacryloxy-2-hydroxypropoxy)phenyl]propane/triethyleneglycoldimethacrvlate (70/30 wt%/wt%) resin matrix. From the experimental results, it was discovered that the PDRC prepared using 0.5 wt% of CQ based on the resin matrix resulted in the finest dental properties.
Reducing the User-perceived Latency of Browsers with NVRAM
Kim, Kyusik,Cho, Yongwoon,Kim, Seongmin,Kim, Taeseok The Institute of Electronics and Information Engin 2017 Journal of semiconductor technology and science Vol.17 No.1
Non-volatile RAM (NVRAM) provides many opportunities to improve the performance of computing devices. In this paper, we present an approach that reduces the user-perceived latency of browsers by using NVRAM. To this end, we first analyze the browser launch process, and then employ several techniques that improve the performance of each step by using NVRAM. Specially, we focus on minimizing the launch time of browser by 1) prefetching the block sequence required for browser launch, 2) caching the web resources in the fast NVRAM, and 3) reusing the displayed bitmap data in the frame buffer. Through implementation, we show that our scheme significantly reduces the launch time of browsers.
Kim, Ohyoung,Chun, Jiyoun,Kim, Yongwoon,Shim, W. Jaewoo 한국공업화학회 2003 Journal of Industrial and Engineering Chemistry Vol.9 No.6
Preparation of polymeric dental restorative materials (PDRM) showing a lower polymerization shrinkage was carried out using the hybrid-filler and 2,2'-bis-[4-(3-methacryloxy-2-hydroxypropoxy) phenyl]propane resin matrix that is diluted with a high molecular weight dimethacrylate monomer. A visible light system was utilized to activate the resin matrix for the polymerization. In order to enhance the miscibility of the inorganic hybrid-filler with organic resin matrix and to conduct the homogeneity of the filler in the PDRM, its surface was hydrophobically treated with y -methacryloxypropyltrimethoxysilane. The degree of conversion (DC), depth of cure, and polymerization shrinkage of the PDRM were investigated. The results revealed that PDRM prepared herein showed markedly lower polymerization shrinkage values. Besides, regardless of the filler loading, both DC and depth of cure values decreased with an increase in the amount of less flexible diluent in the resin matrix.
Kim, Yongwoon,Lee, Hasup,Heo, Lim,Seok, Chaok,Choe, Jungwoo Wiley-Blackwell Publishing, Inc. 2014 Protein science Vol. No.
<P>Vaccinia virus (VACV) encodes many proteins that interfere with the host immune system. Vaccinia virus A46 protein specifically targets the BB-loop motif of TIR-domain-containing proteins to disrupt receptor:adaptor (e.g., TLR4:MAL and TLR4:TRAM) interactions of the toll-like receptor signaling. The crystal structure of A46 (75-227) determined at 2.58 ? resolution showed that A46 formed a homodimer and adopted a Bcl-2-like fold similar to other VACV proteins such as A52, B14, and K7. Our structure also revealed that VIPER (viral inhibitory peptide of TLR4) motif resides in the α1-helix and six residues of the VIPER region were exposed to surface for binding to target proteins. In vitro binding assays between wild type and six mutants A46 (75-227) and full-length MAL identified critical residues in the VIPER motif. Computational modeling of the A46:MAL complex structure showed that the VIPER region of A46 and AB loop of MAL protein formed a major binding interface. In summary, A46 is a homodimer with a Bcl-2-like fold and VIPER motif is believed to be involved in the interaction with MAL protein based on our binding assays.</P>
Reducing the User-perceived Latency of Browsers with NVRAM
Kyusik Kim,Yongwoon Cho,Seongmin Kim,Taeseok Kim 대한전자공학회 2017 Journal of semiconductor technology and science Vol.17 No.1
Non-volatile RAM (NVRAM) provides many opportunities to improve the performance of computing devices. In this paper, we present an approach that reduces the user-perceived latency of browsers by using NVRAM. To this end, we first analyze the browser launch process, and then employ several techniques that improve the performance of each step by using NVRAM. Specially, we focus on minimizing the launch time of browser by 1) prefetching the block sequence required for browser launch, 2) caching the web resources in the fast NVRAM, and 3) reusing the displayed bitmap data in the frame buffer. Through implementation, we show that our scheme significantly reduces the launch time of browsers.