Abstract: Provided is a method for concentrating high-salinity raw water to obtain produced water satisfying Equation 1: Ns=B*(Cm?Cp)??<Equation 1> wherein: B is a salt permeability constant (B-value), and is 3 GFD?B?150 GFD, Ns is an amount of salt permeating the separation membrane (GFD*ppm), and has a value of Fp*Cp, Cm is a raw water-side separation membrane surface concentration (membrane concentration) (ppm), Cp is a produced water salt concentration (permeate concentration) (ppm), and Fp is produced water flux (permeate flux), and is 5 GFD?Fp?100 GFD, by the method comprising passing raw water having a salt concentration of 70,000 ppm or greater through a separation membrane at a temperature of 40° C. or less and a pressure of 1,200 psi or less.

Abstract: A distributed antenna system includes a plurality of remote units configured to service different regions of a service area, and a head-end unit configured to process and transmit downlink signals from base stations to the remote units over optical cables, and to process and transmit uplink signals from the remote units to the base stations, wherein the remote units are configured to adjust or filter a level of downlink signals from the head-end unit and to transmit the adjusted or filtered downlink signals to mobile stations, and to process and transmit uplink signals from mobile stations to the head-end unit over the optical cables.

Abstract: A distributed antenna system includes a plurality of remote units configured to service different regions of a service area, and a head-end unit configured to process and transmit downlink signals from base stations to the remote units over optical cables, and to process and transmit uplink signals from the remote units to the base stations, wherein the remote units are configured to adjust or filter a level of downlink signals from the head-end unit and to transmit the adjusted or filtered downlink signals to mobile stations, and to process and transmit uplink signals from mobile stations to the head-end unit over the optical cables.

Abstract: The present invention relates to an end-modified diene copolymer and a rubber composition for tire tread containing the same. More particularly, the present invention relates to a polymer and a rubber composition for tire tread comprising a mixture of the polymer with a vulcanizing agent and an inorganic filler such as carbon black and silica, the polymer being prepared by reacting the active end of a conjugate diene polymer, or a copolymer comprising at least one conjugate diene compound and a vinyl-substituted aromatic compound, polymerization-initiated using an organic lithium catalyst, with a coupling agent. The rubber composition for tire treads comprising the end-modified diene copolymer as an ingredient rubber enhances rolling resistance and wet skid resistance as well as mechanical properties directly concerned to the properties of the tires.

Abstract: A multi-reactive silicon compound has at least one polyalkyleneglycol substituent with the number average molecular weight being 200 to 10,000 as synthesized by reacting an organohalosilane compound having H—Si bonds with a polyalkyleneglycol ether compound having unsaturated substituents in the presence of a hydrosilylation catalyst. The multi-reactive silicon compound having polyalkyleneglycol substituents is very soluble in organic solvents and reactive to living polymeric ions with high thermal stability due to multiple functional groups, and active living groups. Thus, the addition of the multi-reactive silicon compound to a living polymer solution during an anionic or cationic polymerization reaction activates an intense substitution reaction under mild conditions to introduce a third functional group to the end or side chain of the polymer comprising a repeating monomer unit and provide organic-inorganic hybrid polymers.

Abstract: The present invention provides an effective process for removal of the residual metal catalyst from a polymer solution using water and alcohol containing an inorganic acid after selective hydrogenation of the unsaturated olefinic double bonds in a polymer of a conjugated diene monomer or a copolymer of a conjugated diene monomer and an aromatic vinyl monomer in the presence of a homogeneous organotitanium catalyst, which is an economical and simple process especially for the purpose of an industrial use for effectively removing the residual titanium compounds and lithium salts from the hydrogenated polymer solution.

Abstract: The present invention relates to an end-modified diene copolymer and a rubber composition for tire tread containing the same. More particularly, the present invention relates to a polymer and a rubber composition for tire tread comprising a mixture of the polymer with a vulcanizing agent and an inorganic filler such as carbon black and silica, the polymer being prepared by reacting the active end of a conjugate diene polymer, or a copolymer comprising at least one conjugate diene compound and a vinyl-substituted aromatic compound, polymerization-initiated using an organic lithium catalyst, with a coupling agent. The rubber composition for tire treads comprising the end-modified diene copolymer as an ingredient rubber enhances rolling resistance and wet skid resistance as well as mechanical properties directly concerned to the properties of the tires.

Abstract: A multi-reactive silicon compound has at least one polyalkyleneglycol substituent with the number average molecular weight being 200 to 10,000 as synthesized by reacting an organohalosilane compound having H—Si bonds with a polyalkyleneglycol ether compound having unsaturated substituents in the presence of a silylation catalyst. The multi-reactive silicon compound having polyalkyleneglycol substituents is very soluble in organic solvents and reactive to living polymeric ions with high thermal stability due to multiple functional groups, and active living groups. Thus, the addition of the multi-reactive silicon compound to a living polymer solution during an anionic or cationic polymerization reaction activates an intense substitution reaction under mild conditions to introduce a third functional group to the end or side chain of the polymer comprising a repeating monomer unit and provide organic-inorganic hybrid polymers.

Abstract: The present invention provides an effective process for removal of the residual metal catalyst from a polymer solution using water and alcohol containing an inorganic acid after selective hydrogenation of the unsaturated olefinic double bonds in a polymer of a conjugated diene monomer or a copolymer of a conjugated diene monomer and an aromatic vinyl monomer in the presence of a homogeneous organotitanium catalyst, which is an economical and simple process especially for the purpose of an industrial use for effectively removing the residual titanium compounds and lithium salts from the hydrogenated polymer solution.