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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,최병택,손영진,Kyong-Hee Park,Sang-Yong Lee,Sung-Jin Oh,Chang-Kyu Kim,박용철 한국생물공학회 2007 Biotechnology and Bioprocess Engineering Vol.12 No.5
Preproinsulin is a well-known precursor of human insulin for the regulation of blood glucose levels. In this study, fed-batch fermentations of recombinant Escherichia coli JM109/pPT-MRpi were carried out for the overexpression of human preproinsulin. The expression of human preproinsulin was controlled by the temperature inducible P2 promoter. The time-course profiles of fed-batch fermentation and SDS-PAGE analysis showed that human insulin expression was triggered by a culture temperature change from 30 to 37℃. Fermentation shift strategies, including the multi-step increase of temperature and the modulation of initiation time, were optimized to obtain high titers of cell mass and preproinsulin. The optimized fed-batch fermentation, consisting of a three-step shift of culture temperature from 30 to 37℃ for 2 h, gave the best results of 43.1 g/L of dry cell weight and 33.3% preproinsulin content, which corresponded to 2.0- and 1.2-fold increases, respectively, as compared to those of fed-batch culture at a constant temperature of 37℃.
분산 수동속도장 제어법을 이용한 다중 AGV 시스템의 협조 이송제어
서진호,김영복,이권순 대한전기학회 2006 전기학회논문지 D Vol.55 No.6(D)
- Automatic guided vehicle(AGV) in the factory has an important role to advance the flexible manufacturing system. In this paper, we propose a novel object-transportation control algorithm of cooperative AGV systems to apply decentralized control scheme based on virtual-passivity. It is shown that the cooperative AGV systems ensure stability and the convergence to scaled multiple of each desired velocity field for multiple AGV systems. Finally, the application of proposed virtual passivity-based decentralized control algorithm via system augmentation is applied to be the tracking a circle. Also, the simulation results for the object-transportation by two AGV systems illustrate the validity of the proposed control scheme.
DIP 및 BTMP 혼합비율에 따른 인쇄용지의 LCCO2 분석
서진호,김형진,정성현,박광호 한국펄프·종이공학회 2013 펄프.종이技術 Vol.43 No.1
Recently, there are growing interests on carbon emissions related in climate change which is worldwide emerging important issue. Some research works are now carrying out in order to reduce the carbon emission in pulp and paper industries by the synthesis of precipitated calcium carbonate using the exhaust carbon dioxide from combustion furnace or incinerator. However, for solving the original problems on carbon emission, we need to consider the analysis of basic methodology on CO2 through the process efficiencies. There are two general tools for carbon emissions; one is the greenhouse gas inventory and the other is LCCO2 method which is applied to particular items of raw materials and utilities in unit process. In this study, the carbon emissions in wood-containing printing paper production line were calculated by using LCCO2 method. The general materials and utilities for paper production, such as fibrous materials,chemical additives, electric power, steam, and industrial water were analyzed. As the results,Na2SiO3 showed the highest loads in carbon emissions, and the total amount of carbon emissions was the highest in electricity. In the production line of printing paper using de-inked pulp and BTMP, as the mixing ratio of DIP was higher, the carbon emissions were decreased because of high use of electric power in TMP process.
서진호,이태주,최도침,박정은,류정용 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
신문지용 원료는 주로 ONP(Old Newsprint)와 OMG(Old Magazine), W/L(white ledger)로 구성되어 있으며 압축베일의 형태로 공급된다. 최근 국내ONP 베일에는 광고전단이 많이 포함되어 있으며 고급인쇄용지인 coated paper의 소비량이 증가하면서 수거되는 폐지 내의 함량이 증가하는 추세이다. 매년 변화하는 폐지구성 비율, 품질 등의 탈묵환경 변화에 대처하기 위해서는 각각의 폐지 특성에 적합한 탈묵 조건과 탈묵제를 신문용지 제조에 적용하는 노력이 요구된다. 따라서 본 연구에서는 OMG, ONP, W/L 등 3종의 혼합폐지에 대한 탈묵 시 70%의 백색도를 목표로 최적의 혼합비율을 찾고자 하였으며 도출된 혼합비율의 폐지에 대해 비이온성 계면활성제 및 지방산을 적용하고 탈묵 최적화 연구를 수행하고자하였다.
Cellulase를 이용한 UBC의 분리효율 개선 연구
서진호,박재환,이동진,차제영,류정용 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
Used beverage carton의 재활용 공정은 pulping과 일반적인 초지공정으로 구성되어 있다. Pulping은 주로 drum type의 pulper를 사용하며 다양한 정선설비를 활용하여 섬유와 알루미늄, 합성 polymer 등을 분리한 후 각 원료의 용도에 적합하게 재활용한다. 분리된 합성 polymer 분에는 소량의 섬유가 존재하기에 재활용 polymer의 순도를 높이기 위한 추가적인 처리 및 이에 따른 비용이 요구된다. 따라서 본 연구에서는 UBC의 pulping 처리 후 보다 효율적으로 합성 polymer와 섬유를 분급해내기 위해 cellulase를 적용하였으며 최적 조건을 탐색하고자 하였다.
상온보존팩과 냉장보존팩의 배합비율에 따른 재활용 특성 평가
서진호,이태주,이동진,이명구,류정용 한국펄프·종이공학회 2015 펄프.종이技術 Vol.38 No.1
There are two kinds of cartons for beverage packaging, one is aseptic brick (AB) type and the other is gable top (GT). In this study, AB and GT were used as a raw material of recycled paper to investigate the recyclability at their varied blending ratios. Fiber consistency at pulping decreased as the blending ratio of AB increased. As a result, a lot of fines were generated from AB and flakes from GT increased because shear force in pulper decreased. Bulk of handsheets was more than 2.0 cm3/g, and ISO brightness decreased as the blending ratio of AB increased. The best condition to recycle beverage cartons is to discriminate each cartons separately because of differences in the composition. However, there are problems such as the limit of the collection system and social costs. Therefore, it is assumed that the blending ratios of AB should be adjusted at less than 20% for effective recycling of beverage cartons.