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장홍,김진철 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.36 No.-
Temperature-responsive monoolein (MO) cubic phase was prepared by including polyethyleneimine(PEI) and cinnamic acid (CA) in the cubic phase. PEI/CA aqueous solution exhibited reversible uppercritical solution temperature (UCST) behavior. CA and PEI was included in the cubic phase so that theconcentrations were the same as those in PEI/CA solution which exhibited reversible UCST behavior from32 8C to 50 8C. The maximum release degree of methylene blue observed above UCST (12.5% at 45 8C and13.1% at 50 8C) was apparently higher than the maximum release degree below UCST (4.1% at 25 8C and4.3% at 30 8C).
Sparse Reconfigurable Adaptive Filter with an Upgraded Connection Constraint Algorithm
장홍,황석승 한국지능시스템학회 2011 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.11 No.4
A sparse reconfigurable adaptive filter (SRAF) based on a photonic switch determines the appropriate time delays and weight values for an optical switch implementation of tapped-delay-line (TDL) systems. It is well known that the choice of switch delays is significantly important for efficiently implementing the SRAF. If the same values exist as calculating the sum of weight magnitudes for implementing the connection constraint required by the SRAF, conventional connection algorithm based on sequentially selection the maximum elements might not work perfectly. In an effort to increase the effectiveness of system identification, an upgraded connection algorithm used progressive calculation to obtain the better solution is considered in this paper. The performance of the proposed connection constraint algorithm is illustrated by computer simulation for a system identification application.
UV/visible light responsive lipid gel containing azobenzene
장홍,박단비,김진철 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
Photo sensitive cubic phases containing azobenzene were prepared. Monolein/azobenzene mass ratio was 1:0, 1:0.0025, 1:0.005, and 1:0.025. In order to observe the effect of photo irradiation on the release of water soluble and oil soluble compound, methylene blue and Nile red was loaded to cubic phases. MO cubic phase structure was observed using TEM. Since MO cubic phase was optically isotropic, it didn`t exhinit birefringence under polarized light. But when it was heated, it showed birefringence due to the phase transition. The phase transition temperature of cubic phase decreased with increasing the content of azobenzene. The reason might be that azobenzene was intercalated into MO bilayer thus it would deteriorate the bilayer crystalline structure and decrease the phase transition temperature. Since the phase transition temperature is closely related to the fluidity of MO bilayer, it can have an effect on the release of methylene blue and Nile red.