수피에 의한 삼보광산 폐수의 중금속 흡착

안병준(Byoung Jun Ahn),고경무(Kyung Moo Koh),이형(Hyung Lee),백기현(Ki Hyon Paik) 한국목재공학회 2001 목재공학 Vol.29 No.4

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열화기간에 따른 잉크조성분과 탈묵약품이 신문지의 탈묵성에 미치는 영향

안병준(Byoung Jun Ahn),백기현(Ki Hyon Paik) 한국공업화학회 1999 공업화학 Vol.10 No.5

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혼합고지의 효소 탈묵 및 무염소 표백

안병준 ( Byoung Jun Ahn ),백기현 ( Ki Hyon Paik ) 한국공업화학회 2002 공업화학 Vol.13 No.7

본 연구는 사무실 혼합고지의 효소탈묵과 무염소 표백의 효율을 밝히는 데 있다. 무염소 표백 후, 효소로 탈묵된 펄프의 백색도 증가는 기존 약품으로 탈묵된 펄프의 표백 후 백색도 증가보다 2∼3 포인트 높았다. 3단 표백방법 중 환원표백-오존-과산화수소 3단 표백이 백색도 증가에 가장 효과적이었으며 표백 전 백색도가 낮은 경우(29.2∼30.4% ISO)에는 Y 표백, 표백 전 백색도가 높은 경우(58.0% ISO)에는 F 표백이 우수한 결과를 나타냈다. 3단 표백 후 표백 펄프에서 b값의 변화는 표백방법에 따라 상당한 차이를 나타내고 있지만, a값은 대부분 y축에 근접한다. 환원표백제는 a, b값에 대하여 많은 영향을 미친다. 혼합고지는 색지의 혼입으로 인해 산화계 표백제만으로는 색 제거에 어려움이 있으므로 환원표백제를 통한 색 제거가 필수적이다. 그러나 혼합고지의 표백 전 백색도가 높을수록 환원표백제는 산화표백제에 비해 효과가 감소되었다. 한편 모든 3단 표백에서 최소한 15% 이상의 인장 및 파열지수의 감소가 발생하였다. This experiment was executed to determine the efficiency of enzyme deinking and totally chlorine-free bleaching of MOW. After totally chlorine-free bleaching, the increase on brightness by the enzyme-deinked pulp was two or three points greater than that of the pulp deinked with conventional chemical. Among the three-stage bleaching. Y (or FAS) sequence was the most effective on the improvement of brightenss, Y stage was favorable for the bleaching of low initial brightness, and FAS stage was good for that of high initial brightness. After the three stage bleaching, the variation of b value in deinked pulp depended on the types of bleaching methods used, however, the a value was close to the y axis. In every three-stage bleaching, the decrease of the tensile strength and the burst strength was at least 15%.

바인더의 첨가가 목재 펠릿의 연료적 특성에 미치는 영향

안병준 ( Byoung Jun Ahn ),장희선 ( Hee Sun Chang ),조선택 ( Seong Taek Cho ),한규성 ( Gyu Seong Han ),양인 ( In Yang ) 한국목재공학회 2013 목재공학 Vol.41 No.6

This work was conducted to investigate the effect of the addition of binders, such as rapeseed flour, coffee waste, bark, pine cone and lignin powder, on the fuel characteristics of the pellets fabricated with larch and tulip tree sawdust. Moisture content, bulk density and higher heating value of most pellets fabricated with the binders exceeded the lst-grade pellet standard designated by Korea Forest Research lnstitute, but ash content of the pellets fabricated with rapeseed flour or bark of 10wt on the dry weight basis of sawdust was satisfied with just the 2nd-or 3rd-grade standard. The durability of tulip tree-pellets was positively influenced by the addition of rapeseed flour. Coffee waste or lignin powder and increased with increasing the amount of the binders. For larch-pellets the increase of binders did not greatly affect the durability, and even the durability reduced with the increase of bark or pine cone. From the microscopic observation, the obvious feature of pellet surfaces was not identified by the type of binder but by the addition amount of the binder. In summary, the addition of binders contributed to the fuel characteristics of wood pellets, and particularl the characteristics of wood pellets fabricated with coffee waste improved greatly. Therefore, if the binders are secured sufficiently with a reasonable cost, it might be possible to commercialize wood/binder pellets, which have better fuel characteristics than conventional wood pellets.

목타르와 전분 첨가제 혼합에 따른 목재펠릿 품질특성 평가

안병준 ( Byoung Jun Ahn ),이수민 ( Soo Min Lee ) 한국목재공학회 2014 목재공학 Vol.42 No.3

This study was conducted to investigate the potential of non-used forest biomass residues as raw materials for making wood pellets with additives such as wood tar and starch and to evaluate fuel characteristics of the pellets. Wood tar, a by-product provided from the carbonization process of wood, could be a suitable additive for wood pellet production due to its higher calorific value and lower hazardous heavy metals, such as cadmium and mercury, compared to woody biomass. When the wood tar (10 wt%) was added, the calorific value was increased from 4,630 kcal/kg(wood pellet without additive) to 4,800 kcal/kg (wood pellet with additive). With the increase of additive amount into wood pellet, the length and individual density of wood pellet increased. In addition, bulk density of the pellets was increased, whereas the fine content was decreased. Consequently the overall productivity of wood pellets was improved by adding 2 w% additives into wood pellets; the percentage of productivity increase was 5.9% and 4.9% for adding starch and wood tar, respectively.

케이블TV 네트워크 고도화를 위한 RF/PON 전송시스템에 관한 연구

안병준(Byoung-Jun Ahn),박승권(Sung-Kwon Park) 한국통신학회 2014 韓國通信學會論文誌 Vol.39 No.8(네트워크)

최근 케이블 방송통신서비스는 HD방송에서 3D방송, UHD방송으로 고품질화 되고 100Mbps인터넷에서 1Gbps 인터넷으로 광대역화 되고 있는 상황이다. 그러나 현재 운용중인 HFC망 기술로는 고품질 광대역 서비스를 수용하는 용량에 한계가 있다. 전통적인 HFC망 구조를 유지하면서 네트워크를 고도화하는 대표적인 기술인 DOCSIS3.1, EPOC은 상/하향 주파수대역 확장, 망 업그레이드 비용, 장치 상용화 시기 등 이슈가 있다. HFC망을 FTTH망 구조로 고도화하는 기술은 RFoG, RF Overlay PON이 있으나 네트워크 고도화 비용, 기존 STB 호환 등 이슈가 있다. 본 논문에서는 기존 케이블 방송통신 시스템을 활용하면서 RF 주파수에 제약 없이 1Gbps이상 광대역 인터넷 서비스를 제공하며 댁내 다양한 IP 디바이스에 N 스크린 서비스를 제공하는 RF/PON기반 양방향 Giga급 전송시스템을 제안한다. 제안한 RF/PON시스템을 개발 및 구현하여 실시간 방송과 1Gbps인터넷 동시 제공, 멀티스크린 서비스 등 성능시험을 통해 평가한다. Recently, Cable communications services are becoming the HDTV to 3DTV, UHDTV broadcasting and 100Mbps to 1Gbps Internet. however existing technologies are limited to provide high-quality broadband services in the HFC network. The network upgrade technologies have some problems that Up/Downsteam frequency extension, Cost of upgrading by using DOCSIS3.1, EPOC and Legacy STB compatibility, Cost of upgrading the network by RFoG, RF overlay PON. This paper propose the RF/PON based gigabit Transmission system in order to provide the 1Gbps internet without using frequency and the Multiscreen to IP devices. After the proposed RF/PON system was developed and implemented, this paper evaluate the performance of RF/PON system for simultaneously real-time braodcasting and 1Gbps internet, Multiscreen service, and so on.

백합나무의 반탄화 처리를 이용한 고체연료화 가능성 조사

안병준(Ahn, Byoung Jun),양인(Yang, In),김상태(Kim, Sang Tae),박대학(Park, Daehak) 한국신재생에너지학회 2013 신재생에너지 Vol.9 No.4

This study was performed to investigate the potential of torrefied tulip tree (TT) for the production of pellets. For this purpose, chemical composition and fuel characteristics of torrefied TT were examined. In addition, pellets were fabricated by using sawdust of torrefied TT chip, and durability of the pellet was measured. Lignin content of torrefied TT was higher than that of non-torrefied TT, and increased with the increases of torrefaction temperature and time. Fuel characteristics of torrefied TT were affected by torrefied conditions, and the characteristics were influenced more by torrefaction temperature than by torrefaction time. Higher heating value (HHV) and ash content (AC) of torrefied tulip tree increased with increasing torrefaction temperature, and the values were much higher than HHV and AC values of non-torrefied TT. Durability of pellets fabricated with 230?C- and 250?C-torrefied TT was higher than that of 270?C-torrefied TT, and the value exceeded the minimum requirement (-97.50%) of the 1st-grade pellet standard designated by Korea Forest Research Institute. Based on the results, torrefaction treatment of 250?C/50min to TT might be a optimal condition for the production of TT pellets considering the mass balance and fuel characteristics of TT as well as the durability of the pellets. Thus, it is confirmed that torrefied TT can be used as a raw material for the production of bio-pellets.

인도네시아 오일 팜 바이오매스 잠재량 평가

안병준 ( Byoung Jun Ahn ),한규성 ( Gyu Seoung Han ),최돈하 ( Don Ha Choi ),조성택 ( Sung Taig Cho ),이수민 ( Soo Min Lee ) 한국목재공학회 2014 목재공학 Vol.42 No.3

In this study, the potential of biomass, which is generated from oil palm cultivation and crude palm oil (CPO) production of Indonesia was assessed in the aspect of energy content. The types of oil palm biomass were classified on the basis of the cultivation stage and the CPO production stage. In the cultivation stage, biomass is considered to be produced from its` root, trunk and frond. Other possible biomass resources such as empty fruit bunch (EFB), palm kernel shell (PKS) and fiber were included in the CPO production stage. As results, total biomass from damaged plantation area of Indonesia was estimated to be annually from 3 million to 16 million tons in 2011. From CPO mills, approximately49 million tons/yr of biomass residues were estimated to be annually occurred. Their total energy content from each biomass source in cultivation stage was analyzed to be from 593,000 to 3,197,000 TOEs in terms of gross calorific value. In the case of CPO mills, around 22.7 million TOEs was estimated to be potential energy producible by biomass based on gross calorific value of dry basis. If moisture content considered, net calorific value was analyzed to be decreased to 16.3 million TOEs. Based on the results, the total energy contents of all oil palm biomass were estimated to be up to 25,919,000 TOE in terms of gross calorific value.

국내 숲가꾸기산물을 이용한 목재펠릿의 제조와 품질

안병준 ( Byoung Jun Ahn ),김용식 ( Yong Sik Kim ),이오규 ( Oh Kyu Lee ),조성택 ( Sung Taig Cho ),최돈하 ( Don Ha Choi ),이수민 ( Soo Min Lee ) 한국목재공학회 2013 목재공학 Vol.41 No.4

In this study, it was conducted to produce wood pellets using domestic forest thinning residues and examine their quality according to Korean pellet quality standard. Raw materials were composed of larch and mixed broad leaves species. Based on the small-end diameter (6 cm), they were classified into four different types of raw materials such as LM (larch with middle diameter), LS (larch with small diameter), MM (mixed broadleaf with middle diameter), and MS (mixed broadleaf with small diameter). After crushing and drying process, wood pellets were produced by a ring-die type pelletizer using each raw material. Wood pellets made from four different types of raw materials were tested for their quality such as calorific value, moisture content, ash content, inorganic matters and so on. As results of quality analysis, the calorific values of all wood pellets were higher than 198 kcal/kg, and satisfied with the first grade of Korea wood pellet standard. The ash content was slightly increased after pelletizing. Mechanical durability of wood pellets was highly dependent on the types of raw materials. The quality differences among wood pellets were turned out due to different physical and chemical characteristics of raw materials even though the same pelletizing condition was applied.

케이블모뎀 성능정보를 이용한 HFC 망 전송품질상태 추정방법

안병준(byoung-jun Ahn) 한국통신학회 2003 한국통신학회 학술대회논문집 Vol.2003 No.11