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서진호,박해원,신경욱,Seo, Jin-Ho,Park, Hae-Won,Shin, Kyung-Wook 한국정보통신학회 2013 한국정보통신학회논문지 Vol.17 No.2
본 논문에서는 IEEE 802.16e 모바일 WiMAX 표준의 19가지 블록길이(576~2304)에 따른 6가지 부호율(1/2, 2/3A, 2/3B, 3/4A, 3/4B, 5/6)과 IEEE 802.11n WLAN 표준의 3가지 블록길이(648, 1296, 1944)에 따른 4가지 부호율(1/2, 2/3, 3/4, 5/6)을 지원하는 다중표준 LDPC 복호기를 설계하였다. Layered 복호방식의 블록-시리얼(부분병렬) 구조와 SM(sign-magnitude) 수체계 기반의 DFU(decoding function unit)를 적용하여 하드웨어 복잡도를 최소화시켰다. 설계된 회로는 FPGA 구현을 통해 하드웨어 동작을 검증하였으며, 0.13-${\mu}m$ CMOS 셀 라이브러리로 합성한 결과 약 312,000 게이트와 70,000 비트의 메모리로 구현되었고, 100 MHz@1.8V로 동작하여 79~210 Mbps의 성능을 갖는 것으로 평가되었다. This paper describes a multi-standard LDPC decoder which supports 19 block lengths(576~2304) and 6 code rates(1/2, 2/3A, 2/3B, 3/4A, 3/4B, 5/6) of IEEE 802.16e mobile WiMAX standard and 3 block lengths(648, 1296, 1944) and 4 code rates(1/2, 2/3, 3/4, 5/6) of IEEE 802.11n WLAN standard. To minimize hardware complexity, it adopts a block-serial (partially parallel) architecture based on the layered decoding scheme. A DFU(decoding function unit) based on sign-magnitude arithmetic is used for hardware reduction. The designed LDPC decoder is verified by FPGA implementation, and synthesized with a 0.13-${\mu}m$ CMOS cell library. It has 312,000 gates and 70,000 bits RAM. The estimated throughput is about 79~210 Mbps at 100 MHz@1.8v.
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.