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서진호,이동진,이명구,오덕환 한국펄프·종이공학회 2015 펄프.종이기술 Vol.38 No.1
Wet-tissue has been used for baby wipe, cleansing pads, industrial wipes, pain relief, personal hygiene, pet care, and healthcare at home, care facilities, restaurant, and hospital. Raw materials of wet-tissue are mainly natural fibers and synthetic fibers such as cotton, rayon, PET (polyethylene terephthalate) and so on. In this study, electrolytic water of NaCl solution was used as fluid in wet-tissue, and the effect of raw materials on antibacterial rate of wet-tissue was investigated. Rayon (100%) showed an excellent antibacterial rate compared with cotton (100%) and rayon:PET (50:50). Antibacterial rate increased as Cl concentration of electrolytic water increased. Absorption of rayon:PET (50:50) was uneven and antibacterial rate of wet-tissue slightly increased by increase of Cl concentration. Antibacterial rate of wet-tissue was 100% under the conditions of more than 1.5 mL of electrolytic water dosage, and dropped under 50% after storage period of 48 hours.
서진호,김문경,정형모,김용식 한국펄프·종이공학회 2019 펄프.종이기술 Vol.51 No.4
In this study, we have synthesized a lignin/polyaniline composite using a typical conductive polymer as a high value-added biomaterial. Further, the morphological characteristics as well as the chemical and electrochemical properties of the lignin/polyaniline composite were evaluated. The morphological analysis of the composite denoted that polyaniline particles, smaller than the lignin particles, formed near the surface of the lignin particles. In addition, FT-IR (Fourier-transform infrared spectroscopy) analysis of the composite revealed that the intrinsic peaks corresponding to lignin considerably reduced or even disappeared and that the lignin/polyaniline interaction occurred because of the shifting of the main polyaniline peaks. Although the electrochemical properties of lignin were considerably poor, the composite exhibited good characteristics. In particular, the capacitance of lignin, lignin/polyaniline composite, and pure polyaniline were 1.52, 131.75, and 214.44 mF·cm-2, i.e., the capacitance of the composite was lower than that of pure polyaniline but considerably higher than that of lignin. Because the lignin content in the composite was approximately 55%, the resulting capacitance was considered to be good.
결함 어골도 분석에 의한 모바일 결제 시스템의 보안성 개선에 관한 연구
서진호,박만곤 한국멀티미디어학회 2018 멀티미디어학회논문지 Vol.21 No.1
As financial transactions using mobile devices have been activated, mobile payment services have appeared and many changes have been made to the existing financial service methods. Due to the simplified payment method of mobile payment service, security threats such as personal information leakage, phishing damage, and malicious code are increasing. Research that can solve this is needed. In this paper, we discuss the features and security factors of mobile payment system. In order to improve the security of mobile payment system, we propose a fault analysis method based on frequency of occurrence using Fault Fishbone Analysis(FFA) technique.
서진호,이광섭,류정용 한국펄프·종이공학회 2018 펄프.종이技術 Vol.50 No.6
In this study, dual dry strength agents (PVAm and anionic PAM) with fast adsorption rate were used to improve the strength properties of TMP mixed tissue paper which is difficult to retain fines. The retention of fines, formation and strength properties of handsheets were evaluated according to the mechanical beating of pulp slurry and addition level of PVAm and anionic PAM. In addition, dual system and conventional cationic PAM were added before and after beating in order to compare the effect of dry strength agents on the physical properties of handsheets. The dual system (PVAm and anionic PAM) which shows the free conformation of polymer chains based on a simple structure and few steric hindrance compared with conventional cationic PAM, is analyzed to exhibit a better strength enhancement when the fiber length is long before beating, but there was no significant effect on retention. Also, the dual system improved the physical properties of handsheets even when the pulp slurry was beaten to 600 mL CSF to improve the plausibility of fibers. In terms of fines retention, dual system did not show a tendency depending on the dosage of PVAm, however, 3% dosage of PVAm is most appropriate, judging based on the improvement of physical properties of handsheets. Consequentially, the rapid adsorption of PVAm makes it possible to easily change the charge of the fiber surface to strong cationic, and then to induce rapid adsorption of anionic PAM to improve the strength without contamination due to the formation of residual polymeric complex.