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- 저자 : Fazi, Filippo M. (검색결과 2 건)
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Pourjavadi A.,Amini-Fazi M. S.,Hosseinzadeh H. The Polymer Society of Korea 2005 Macromolecular Research Vol.13 No.1
In this study, a series of highly swelling hydrogels based on sodium alginate (NaAlg) and polymethacrylamide (PMAM) was prepared through free radical polymerization. The graft copolymerization reaction was performed in a homogeneous medium and in the presence of ammonium persulfate (APS) as an initiator and N,N'-methylenebisacrylamide (MBA) as a crosslinker. The crosslinked graft copolymer, alginate-graft-polymethacrylamide (Alg-gPMAM), was then partially hydrolyzed by NaOH solution to yield a hydrogel, hydrolyzed alginate-graft-polymethacrylamide (H-Alg-g-PMAM). During alkaline hydrolysis, the carboxamide groups of Alg-g-PMAM were converted into hydrophilic carboxylate anions. Either the Alg-g-PMAM or the H-Alg-g-PMAM was characterized by FTIR spectroscopy. The effects of the grafting variables (i.e., concentration of MBA, MAM, and APS) and the alkaline hydrolysis conditions (i.e., NaOH concentration, hydrolysis time, and temperature) were optimized systematically to achieve a hydrogel having the maximum swelling capacity. Measurements of the absorbency in various aqueous salt solutions indicated that the swelling capacity decreased upon increasing the ionic strength of the swelling medium. This behavior could be attributed to a charge screening effect for monovalent cations, as well as ionic cross-linking for multivalent cations. Because of the high swelling capacity in salt solutions, however, the hydrogels might be considered as anti-salt superabsorbents. The swelling behavior of the superabsorbing hydrogels was also measured in solutions having values of pH ranging from 1 to 13. Furthermore, the pH reversibility and on/off switching behavior, measured at pH 2.0 and 8.0, suggested that the synthesized hydrogels were excellent candidates for the controlled delivery of bioactive agents. Finally, we performed preliminary investigations of the swelling kinetics of the synthesized hydrogels at various particle sizes.
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Seo, Jeong-Il,Kang, Kyeong-Ok,Fazi, Filippo M.,Nelson, Philip A. 한국음향학회 2009 韓國音響學會誌 Vol.28 No.8
본 논문에서는 3차원 라우드스피커 어레이를 이용하여 다수의 청취자에게 동일하게 실감 있는 음장을 제공하기 위한 음장 재현 알고리즘을 제안한다. 제안된 알고리즘은 제어하고자 하는 3차원 공간 영역을 정의하고, 정의된 영역에서 원음장과 라우드스피커 어레이를 이용하여 재현되는 음장간의 자승오차가 최소가 되도록 라우드스피커 구동신호를 제어하는데 기초한다. 제안된 알고리즘의 성능을 검증하기 위하여 40개의 라우드스피커를 이용한 구형 3차원 어레이를 구성하였으며, 이를 이용한 실험결과와 고찰결과를 제시한다. In this paper, we propose a novel sound field reconstruction algorithm using a three dimensional loudspeaker array for providing realistic sound field to multiple listeners. The proposed algorithm is based on minimization of the squared error between the original sound field and the reconstructed sound field by the loudspeaker array over a predefined three dimensional region of the space using a loudspeaker array surrounding the listening area. For evaluating the proposed algorithm, we constructed the three dimensional array composed of 40 loudspeakers and discuss the relevant experiment results.
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